Fix build

.patch/opus/0001-disable-clang-runtime-neon.patch

@@ -0,0 +1,28 @@
+From cc15da16e533b2a801934eab2dfeaf3c3949a1dc Mon Sep 17 00:00:00 2001
+From: crueter <crueter@eden-emu.dev>
+Date: Mon, 8 Sep 2025 12:28:55 -0400
+Subject: [PATCH] [cmake] disable NEON runtime check on clang-cl
+
+When enabling runtime NEON checking for clang-cl, the linker would error out with `undefined symbol: __emit`, since clang doesn't actually implement this instruction. Therefore it makes sense to disable the runtime check by default on this platform, until either this is fixed or a clang-cl compatible intrinsic check is added (I don't have enough knowledge of MSVC to do this)
+---
+ cmake/OpusConfig.cmake | 7 ++++++-
+ 1 file changed, 6 insertions(+), 1 deletion(-)
+
+diff --git a/cmake/OpusConfig.cmake b/cmake/OpusConfig.cmake
+index e9319fbad..d0f459e88 100644
+--- a/cmake/OpusConfig.cmake
++++ b/cmake/OpusConfig.cmake
+@@ -71,7 +71,12 @@ elseif(OPUS_CPU_ARM AND NOT OPUS_DISABLE_INTRINSICS)
+   opus_detect_neon(COMPILER_SUPPORT_NEON)
+   if(COMPILER_SUPPORT_NEON)
+     option(OPUS_USE_NEON "Option to enable NEON" ON)
+-    option(OPUS_MAY_HAVE_NEON "Does runtime check for neon support" ON)
++    if (MSVC AND CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
++      set(NEON_RUNTIME_CHECK_DEFAULT OFF)
++    else()
++      set(NEON_RUNTIME_CHECK_DEFAULT ON)
++    endif()
++    option(OPUS_MAY_HAVE_NEON "Does runtime check for neon support" ${NEON_RUNTIME_CHECK_DEFAULT})
+     option(OPUS_PRESUME_NEON "Assume target CPU has NEON support" OFF)
+     if(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64")
+       set(OPUS_PRESUME_NEON ON)

.patch/opus/0002-no-install.patch

@@ -0,0 +1,153 @@
+From bf455b67b4eaa446ffae5d25410b141b7b1b1082 Mon Sep 17 00:00:00 2001
+From: crueter <crueter@eden-emu.dev>
+Date: Mon, 8 Sep 2025 12:08:20 -0400
+Subject: [PATCH] [cmake] `OPUS_INSTALL` option; only default install if root
+ project
+
+Signed-off-by: crueter <crueter@eden-emu.dev>
+---
+ CMakeLists.txt | 112 ++++++++++++++++++++++++++++---------------------
+ 1 file changed, 64 insertions(+), 48 deletions(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index fcf034b19..08b5e16f8 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -4,6 +4,13 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
+ include(OpusPackageVersion)
+ get_package_version(PACKAGE_VERSION PROJECT_VERSION)
+ 
++# root project detection
++if(DEFINED PROJECT_NAME)
++  set(root_project OFF)
++else()
++  set(root_project ON)
++endif()
++
+ project(Opus LANGUAGES C VERSION ${PROJECT_VERSION})
+ 
+ include(OpusFunctions)
+@@ -83,12 +90,16 @@ set(OPUS_DNN_FLOAT_DEBUG_HELP_STR "Run DNN computations as float for debugging p
+ option(OPUS_DNN_FLOAT_DEBUG ${OPUS_DNN_FLOAT_DEBUG_HELP_STR} OFF)
+ add_feature_info(OPUS_DNN_FLOAT_DEBUG OPUS_DNN_FLOAT_DEBUG ${OPUS_DNN_FLOAT_DEBUG_HELP_STR})
+ 
++set(OPUS_INSTALL_HELP_STR "Install Opus targets")
++option(OPUS_INSTALL ${OPUS_INSTALL_HELP_STR} ${root_project})
++add_feature_info(OPUS_INSTALL OPUS_INSTALL ${OPUS_INSTALL_HELP_STR})
++
+ set(OPUS_INSTALL_PKG_CONFIG_MODULE_HELP_STR "install pkg-config module.")
+-option(OPUS_INSTALL_PKG_CONFIG_MODULE ${OPUS_INSTALL_PKG_CONFIG_MODULE_HELP_STR} ON)
++option(OPUS_INSTALL_PKG_CONFIG_MODULE ${OPUS_INSTALL_PKG_CONFIG_MODULE_HELP_STR} ${OPUS_INSTALL})
+ add_feature_info(OPUS_INSTALL_PKG_CONFIG_MODULE OPUS_INSTALL_PKG_CONFIG_MODULE ${OPUS_INSTALL_PKG_CONFIG_MODULE_HELP_STR})
+ 
+ set(OPUS_INSTALL_CMAKE_CONFIG_MODULE_HELP_STR "install CMake package config module.")
+-option(OPUS_INSTALL_CMAKE_CONFIG_MODULE ${OPUS_INSTALL_CMAKE_CONFIG_MODULE_HELP_STR} ON)
++option(OPUS_INSTALL_CMAKE_CONFIG_MODULE ${OPUS_INSTALL_CMAKE_CONFIG_MODULE_HELP_STR} ${OPUS_INSTALL})
+ add_feature_info(OPUS_INSTALL_CMAKE_CONFIG_MODULE OPUS_INSTALL_CMAKE_CONFIG_MODULE ${OPUS_INSTALL_CMAKE_CONFIG_MODULE_HELP_STR})
+ 
+ set(OPUS_DRED_HELP_STR "enable DRED.")
+@@ -613,53 +624,58 @@ if(OPUS_BUILD_FRAMEWORK)
+                         OUTPUT_NAME Opus)
+ endif()
+ 
+-install(TARGETS opus
+-        EXPORT OpusTargets
+-        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+-        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+-        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+-        FRAMEWORK DESTINATION ${CMAKE_INSTALL_PREFIX}
+-        PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/opus)
+-
+-if(OPUS_INSTALL_PKG_CONFIG_MODULE)
+-  set(prefix ${CMAKE_INSTALL_PREFIX})
+-  set(exec_prefix ${CMAKE_INSTALL_PREFIX})
+-  set(libdir ${CMAKE_INSTALL_FULL_LIBDIR})
+-  set(includedir ${CMAKE_INSTALL_FULL_INCLUDEDIR})
+-  set(VERSION ${PACKAGE_VERSION})
+-  if(HAVE_LIBM)
+-    set(LIBM "-lm")
++if (OPUS_INSTALL)
++  install(TARGETS opus
++          EXPORT OpusTargets
++          ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
++          LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
++          RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
++          FRAMEWORK DESTINATION ${CMAKE_INSTALL_PREFIX}
++          PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/opus)
++
++  if(OPUS_INSTALL_PKG_CONFIG_MODULE)
++    set(prefix ${CMAKE_INSTALL_PREFIX})
++    set(exec_prefix ${CMAKE_INSTALL_PREFIX})
++    set(libdir ${CMAKE_INSTALL_FULL_LIBDIR})
++    set(includedir ${CMAKE_INSTALL_FULL_INCLUDEDIR})
++    set(VERSION ${PACKAGE_VERSION})
++    if(HAVE_LIBM)
++      set(LIBM "-lm")
++    endif()
++    configure_file(opus.pc.in opus.pc)
++    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/opus.pc
++            DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
++  endif()
++
++  if(OPUS_INSTALL_CMAKE_CONFIG_MODULE)
++    set(CPACK_GENERATOR TGZ)
++    include(CPack)
++    set(CMAKE_INSTALL_PACKAGEDIR ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
++    install(EXPORT OpusTargets
++            NAMESPACE Opus::
++            DESTINATION ${CMAKE_INSTALL_PACKAGEDIR})
++
++    include(CMakePackageConfigHelpers)
++
++    set(INCLUDE_INSTALL_DIR ${CMAKE_INSTALL_INCLUDEDIR})
++    configure_package_config_file(
++      ${PROJECT_SOURCE_DIR}/cmake/OpusConfig.cmake.in
++      OpusConfig.cmake
++      INSTALL_DESTINATION
++      ${CMAKE_INSTALL_PACKAGEDIR}
++      PATH_VARS
++      INCLUDE_INSTALL_DIR
++      INSTALL_PREFIX
++      ${CMAKE_INSTALL_PREFIX})
++
++    write_basic_package_version_file(OpusConfigVersion.cmake
++                                    VERSION ${PROJECT_VERSION}
++                                    COMPATIBILITY SameMajorVersion)
++
++    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/OpusConfig.cmake
++                  ${CMAKE_CURRENT_BINARY_DIR}/OpusConfigVersion.cmake
++            DESTINATION ${CMAKE_INSTALL_PACKAGEDIR})
+   endif()
+-  configure_file(opus.pc.in opus.pc)
+-  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/opus.pc
+-          DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
+-endif()
+-
+-if(OPUS_INSTALL_CMAKE_CONFIG_MODULE)
+-  set(CPACK_GENERATOR TGZ)
+-  include(CPack)
+-  set(CMAKE_INSTALL_PACKAGEDIR ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
+-  install(EXPORT OpusTargets
+-          NAMESPACE Opus::
+-          DESTINATION ${CMAKE_INSTALL_PACKAGEDIR})
+-
+-  include(CMakePackageConfigHelpers)
+-
+-  set(INCLUDE_INSTALL_DIR ${CMAKE_INSTALL_INCLUDEDIR})
+-  configure_package_config_file(${PROJECT_SOURCE_DIR}/cmake/OpusConfig.cmake.in
+-                                OpusConfig.cmake
+-                                INSTALL_DESTINATION
+-                                ${CMAKE_INSTALL_PACKAGEDIR}
+-                                PATH_VARS
+-                                INCLUDE_INSTALL_DIR
+-                                INSTALL_PREFIX
+-                                ${CMAKE_INSTALL_PREFIX})
+-  write_basic_package_version_file(OpusConfigVersion.cmake
+-                                   VERSION ${PROJECT_VERSION}
+-                                   COMPATIBILITY SameMajorVersion)
+-  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/OpusConfig.cmake
+-                ${CMAKE_CURRENT_BINARY_DIR}/OpusConfigVersion.cmake
+-          DESTINATION ${CMAKE_INSTALL_PACKAGEDIR})
+ endif()
+ 
+ if(OPUS_BUILD_PROGRAMS)

CMakeLists.txt

@@ -84,6 +84,8 @@ option(ENABLE_WERROR "Enable -Werror diagnostics" ON)
 # Lossless Scaling frame generation. Only Android.
 cmake_dependent_option(ENABLE_LSFG "Enable Lossless Scaling frame generation" ON "ANDROID" OFF)
 
+option(ENABLE_RESHADE "Enable ReShade FX post-processing effects" ON)
+
 # non-linux bundled qt are static
 if (YUZU_USE_BUNDLED_QT AND (APPLE OR NOT UNIX))
     set(YUZU_STATIC_BUILD ON)
@@ -461,6 +463,21 @@ if (NOT YUZU_STATIC_ROOM)
     if (ZLIB_ADDED)
         add_library(ZLIB::ZLIB ALIAS zlibstatic)
     endif()
+
+    # Opus
+    AddJsonPackage(opus)
+
+    if (Opus_ADDED)
+        if (MSVC AND CXX_CLANG)
+            target_compile_options(opus PRIVATE
+                $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-implicit-function-declaration>
+            )
+        endif()
+    endif()
+
+    if (NOT TARGET Opus::opus)
+        add_library(Opus::opus ALIAS opus)
+    endif()
 endif()
 
 if(NOT TARGET Boost::headers)

CMakeModules/find/FindOpus.cmake

@@ -0,0 +1,22 @@
+# SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# SPDX-FileCopyrightText: 2022 yuzu Emulator Project
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+find_package(PkgConfig QUIET)
+pkg_search_module(OPUS QUIET IMPORTED_TARGET opus)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Opus
+    REQUIRED_VARS OPUS_LINK_LIBRARIES
+    VERSION_VAR OPUS_VERSION
+)
+
+if (MSYS2)
+    FixMsysPath(PkgConfig::OPUS)
+endif()
+
+if (Opus_FOUND AND NOT TARGET Opus::opus)
+    add_library(Opus::opus ALIAS PkgConfig::OPUS)
+endif()

cpmfile.json

@@ -90,7 +90,7 @@
         "name": "ffmpeg",
         "package": "FFmpeg",
         "repo": "crueter-ci/FFmpeg",
-        "version": "9.0.1-1788303113-bf1b838f2a"
+        "version": "9.0.1-1788120736-bf1b838f2a"
     },
     "fmt": {
         "hash": "f0da82c545b01692e9fd30fdfb613dbb8dd9716983dcd0ff19ac2a8d36f74beb5540ef38072fdecc1e34191b3682a8542ecbf3a61ef287dbba0a2679d4e023f2",
@@ -218,6 +218,21 @@
         "repo": "jimmy-park/openssl-cmake",
         "version": "3.6.2"
     },
+    "opus": {
+        "find_args": "MODULE",
+        "hash": "9506147b0de35befda8633ff272981cc2575c860874791bd455b752f797fd7dbd1079f0ba42ccdd7bb1fe6773fa5e84b3d75667c2883dd1fb2d0e4a5fa4f8387",
+        "min_version": "1.3",
+        "options": [
+            "OPUS_PRESUME_NEON ON"
+        ],
+        "package": "Opus",
+        "patches": [
+            "0001-disable-clang-runtime-neon.patch",
+            "0002-no-install.patch"
+        ],
+        "repo": "xiph/opus",
+        "version": "a3f0ec02b3"
+    },
     "quazip": {
         "hash": "609c240c7f029ac26a37d8fbab51bc16284e05e128b78b9b9c0e95d083538c36047a67d682759ac990e4adb0eeb90f04f1ea7fe2253bbda7e7e3bcce32e53dd8",
         "min_version": "1.3",
@@ -231,6 +246,11 @@
         "repo": "stachenov/quazip",
         "version": "2e95c9001b"
     },
+    "reshade": {
+        "hash": "a1bd3fcf135fb6d018c1831ae45a8942d9777d0418b55e1189921e2ab775d1b53b0a9808924e09ef1c3e68ea11d69b3bcbebc7f4b59de14f6deec2dc24531d5e",
+        "repo": "crosire/reshade",
+        "version": "v6.7.3"
+    },
     "sdl3": {
         "hash": "df5a323af7ac366661a3c0e887969c72584d232f3cc211419d59b0487b620b6b2859d4549c9e8df002ee489290062e466fcfddf7edc0872a37b1f2845e81c0f3",
         "min_version": "3.2.10",

dist/post_shaders/EdenColorGrade.fx

@@ -0,0 +1,62 @@
+texture EdenBackBufferTex : COLOR;
+sampler EdenBackBuffer { Texture = EdenBackBufferTex; };
+
+uniform float Saturation <
+    ui_type = "slider";
+    ui_label = "Saturation";
+    ui_min = 0.0; ui_max = 2.0; ui_step = 0.01;
+> = 1.0;
+
+uniform float Brightness <
+    ui_type = "slider";
+    ui_label = "Brightness";
+    ui_min = 0.0; ui_max = 2.0; ui_step = 0.01;
+> = 1.0;
+
+uniform float Contrast <
+    ui_type = "slider";
+    ui_label = "Contrast";
+    ui_min = 0.0; ui_max = 2.0; ui_step = 0.01;
+> = 1.0;
+
+uniform float Gamma <
+    ui_type = "slider";
+    ui_label = "Gamma";
+    ui_min = 0.5; ui_max = 2.0; ui_step = 0.01;
+> = 1.0;
+
+void VS_Eden(in uint id : SV_VertexID, out float4 pos : SV_Position, out float2 uv : TEXCOORD)
+{
+    uv = float2(0.0, 0.0);
+    if (id == 2)
+    {
+        uv.x = 2.0;
+    }
+    if (id == 1)
+    {
+        uv.y = 2.0;
+    }
+    pos = float4(uv * float2(2.0, -2.0) + float2(-1.0, 1.0), 0.0, 1.0);
+}
+
+float4 PS_ColorGrade(float4 pos : SV_Position, float2 uv : TEXCOORD) : SV_Target
+{
+    float3 rgb = tex2D(EdenBackBuffer, uv).rgb;
+
+    float luma = dot(rgb, float3(0.2126, 0.7152, 0.0722));
+    rgb = lerp(float3(luma, luma, luma), rgb, Saturation);
+    rgb *= Brightness;
+    rgb = (rgb - 0.5) * Contrast + 0.5;
+    rgb = pow(max(rgb, 0.0), 1.0 / max(Gamma, 0.0001));
+
+    return float4(saturate(rgb), 1.0);
+}
+
+technique EdenColorGrade
+{
+    pass
+    {
+        VertexShader = VS_Eden;
+        PixelShader = PS_ColorGrade;
+    }
+}

dist/post_shaders/EdenSharpen.fx

@@ -0,0 +1,45 @@
+texture EdenBackBufferTex : COLOR;
+sampler EdenBackBuffer { Texture = EdenBackBufferTex; };
+
+uniform float Amount <
+    ui_type = "slider";
+    ui_label = "Amount";
+    ui_min = 0.0; ui_max = 3.0; ui_step = 0.01;
+> = 0.6;
+
+void VS_Eden(in uint id : SV_VertexID, out float4 pos : SV_Position, out float2 uv : TEXCOORD)
+{
+    uv = float2(0.0, 0.0);
+    if (id == 2)
+    {
+        uv.x = 2.0;
+    }
+    if (id == 1)
+    {
+        uv.y = 2.0;
+    }
+    pos = float4(uv * float2(2.0, -2.0) + float2(-1.0, 1.0), 0.0, 1.0);
+}
+
+float4 PS_Sharpen(float4 pos : SV_Position, float2 uv : TEXCOORD) : SV_Target
+{
+    float2 texel = float2(BUFFER_RCP_WIDTH, BUFFER_RCP_HEIGHT);
+
+    float3 centre = tex2D(EdenBackBuffer, uv).rgb;
+    float3 blur = tex2D(EdenBackBuffer, uv + float2(-texel.x, 0.0)).rgb;
+    blur += tex2D(EdenBackBuffer, uv + float2(texel.x, 0.0)).rgb;
+    blur += tex2D(EdenBackBuffer, uv + float2(0.0, -texel.y)).rgb;
+    blur += tex2D(EdenBackBuffer, uv + float2(0.0, texel.y)).rgb;
+    blur *= 0.25;
+
+    return float4(centre + (centre - blur) * Amount, 1.0);
+}
+
+technique EdenSharpen
+{
+    pass
+    {
+        VertexShader = VS_Eden;
+        PixelShader = PS_Sharpen;
+    }
+}

dist/post_shaders/EdenVignette.fx

@@ -0,0 +1,50 @@
+texture EdenBackBufferTex : COLOR;
+sampler EdenBackBuffer { Texture = EdenBackBufferTex; };
+
+uniform float Strength <
+    ui_type = "slider";
+    ui_label = "Strength";
+    ui_tooltip = "How dark the corners become.";
+    ui_min = 0.0; ui_max = 2.0; ui_step = 0.01;
+> = 0.6;
+
+uniform float Aspect <
+    ui_type = "slider";
+    ui_label = "Aspect";
+    ui_min = 0.5; ui_max = 2.0; ui_step = 0.01;
+> = 1.0;
+
+void VS_Eden(in uint id : SV_VertexID, out float4 pos : SV_Position, out float2 uv : TEXCOORD)
+{
+    uv = float2(0.0, 0.0);
+    if (id == 2)
+    {
+        uv.x = 2.0;
+    }
+    if (id == 1)
+    {
+        uv.y = 2.0;
+    }
+    pos = float4(uv * float2(2.0, -2.0) + float2(-1.0, 1.0), 0.0, 1.0);
+}
+
+float4 PS_Vignette(float4 pos : SV_Position, float2 uv : TEXCOORD) : SV_Target
+{
+    float2 diff = uv - 0.5;
+    diff.x *= Aspect;
+    diff.y /= max(Aspect, 0.0001);
+
+    float falloff = 1.0 - min(1.0, Strength * dot(diff, diff) * 2.0);
+    float3 rgb = tex2D(EdenBackBuffer, uv).rgb;
+
+    return float4(rgb * falloff, 1.0);
+}
+
+technique EdenVignette
+{
+    pass
+    {
+        VertexShader = VS_Eden;
+        PixelShader = PS_Vignette;
+    }
+}

docs/Deps.md

@@ -60,6 +60,7 @@ All other dependencies will be downloaded and built by [CPM](https://github.com/
 * [ZLIB](https://www.zlib.net/) 1.2+
 * [zstd](https://facebook.github.io/zstd/) 1.5+
 * [enet](http://enet.bespin.org/) 1.3+
+* [Opus](https://opus-codec.org/) 1.3+
 
 Vulkan 1.3.274+ is also needed:
 
@@ -120,7 +121,7 @@ sudo emerge -a \
     dev-libs/boost dev-libs/openssl dev-libs/discord-rpc \
     dev-util/spirv-tools dev-util/spirv-headers dev-util/vulkan-headers \
     dev-util/vulkan-utility-libraries dev-util/glslang \
-    media-gfx/renderdoc media-libs/libva media-video/ffmpeg \
+    media-gfx/renderdoc media-libs/libva media-libs/opus media-video/ffmpeg \
     media-libs/VulkanMemoryAllocator media-libs/libsdl3 media-libs/cubeb \
     net-libs/enet \
     sys-libs/zlib \
@@ -152,7 +153,7 @@ Required USE flags:
 <summary>Arch Linux</summary>
 
 ```sh
-sudo pacman -Syu --needed base-devel boost catch2 cmake enet ffmpeg fmt git glslang libzip lz4 ninja nlohmann-json openssl qt6-base qt6-multimedia qt6-charts sdl3 zlib zstd zip unzip vulkan-headers vulkan-utility-libraries libusb spirv-tools spirv-headers
+sudo pacman -Syu --needed base-devel boost catch2 cmake enet ffmpeg fmt git glslang libzip lz4 ninja nlohmann-json openssl opus qt6-base qt6-multimedia qt6-charts sdl3 zlib zstd zip unzip vulkan-headers vulkan-utility-libraries libusb spirv-tools spirv-headers
 ```
 
 * Building with QT Web Engine requires `qt6-webengine` as well.
@@ -165,7 +166,7 @@ sudo pacman -Syu --needed base-devel boost catch2 cmake enet ffmpeg fmt git glsl
 <summary>Ubuntu, Debian, Mint Linux</summary>
 
 ```sh
-sudo apt-get install autoconf cmake g++ gcc git glslang-tools libglu1-mesa-dev libhidapi-dev libpulse-dev libtool libudev-dev libxcb-icccm4 libxcb-image0 libxcb-keysyms1 libxcb-render-util0 libxcb-xinerama0 libxcb-xkb1 libxext-dev libxkbcommon-x11-0 mesa-common-dev nasm ninja-build qt6-base-private-dev catch2 libfmt-dev liblz4-dev nlohmann-json3-dev libzstd-dev libssl-dev libavfilter-dev libavcodec-dev libswscale-dev pkg-config zlib1g-dev libva-dev libvdpau-dev qt6-tools-dev qt6-charts-dev libvulkan-dev spirv-tools spirv-headers libusb-1.0-0-dev libxbyak-dev libboost-dev libboost-fiber-dev libboost-context-dev libsdl3-dev libasound2t64 vulkan-utility-libraries-dev
+sudo apt-get install autoconf cmake g++ gcc git glslang-tools libglu1-mesa-dev libhidapi-dev libpulse-dev libtool libudev-dev libxcb-icccm4 libxcb-image0 libxcb-keysyms1 libxcb-render-util0 libxcb-xinerama0 libxcb-xkb1 libxext-dev libxkbcommon-x11-0 mesa-common-dev nasm ninja-build qt6-base-private-dev catch2 libfmt-dev liblz4-dev nlohmann-json3-dev libzstd-dev libssl-dev libavfilter-dev libavcodec-dev libswscale-dev pkg-config zlib1g-dev libva-dev libvdpau-dev qt6-tools-dev qt6-charts-dev libvulkan-dev spirv-tools spirv-headers libusb-1.0-0-dev libxbyak-dev libboost-dev libboost-fiber-dev libboost-context-dev libsdl3-dev libopus-dev libasound2t64 vulkan-utility-libraries-dev
 ```
 
 * Ubuntu 26.04, Linux Mint 22.3, or Debian 13 or later is required.
@@ -212,7 +213,7 @@ First, enable the community repository; [see here](https://wiki.alpinelinux.org/
 # Enable the community repository
 setup-apkrepos -c
 # Install
-apk add g++ git cmake make mesa-dev qt6-qtbase-dev qt6-qtbase-private-dev libquazip1-qt6 ffmpeg-dev qt6-charts-dev libusb-dev libtool boost-dev sdl3-dev zstd-dev vulkan-utility-libraries spirv-tools-dev openssl-dev nlohmann-json lz4-dev  jq patch
+apk add g++ git cmake make mesa-dev qt6-qtbase-dev qt6-qtbase-private-dev libquazip1-qt6 ffmpeg-dev qt6-charts-dev libusb-dev libtool boost-dev sdl3-dev zstd-dev vulkan-utility-libraries spirv-tools-dev openssl-dev nlohmann-json lz4-dev opus-dev jq patch
 ```
 
 </details>
@@ -260,7 +261,7 @@ brew install molten-vk
 
 As root run:
 ```sh
-pkg install devel/cmake devel/sdl3 devel/boost-libs devel/catch2 devel/libfmt devel/nlohmann-json devel/ninja devel/nasm devel/autoconf devel/pkgconf devel/qt6-base x11-toolkits/qt6-charts devel/simpleini net/enet multimedia/ffnvcodec-headers multimedia/ffmpeg archivers/liblz4 lang/gcc12 graphics/glslang graphics/vulkan-utility-libraries graphics/spirv-tools www/cpp-httplib graphics/vulkan-utility-libraries graphics/vulkan-headers graphics/spirv-headers quazip-qt6
+pkg install devel/cmake devel/sdl3 devel/boost-libs devel/catch2 devel/libfmt devel/nlohmann-json devel/ninja devel/nasm devel/autoconf devel/pkgconf devel/qt6-base x11-toolkits/qt6-charts devel/simpleini net/enet multimedia/ffnvcodec-headers multimedia/ffmpeg audio/opus archivers/liblz4 lang/gcc12 graphics/glslang graphics/vulkan-utility-libraries graphics/spirv-tools www/cpp-httplib graphics/vulkan-utility-libraries graphics/vulkan-headers graphics/spirv-headers quazip-qt6
 ```
 
 If using FreeBSD 12 or prior, use `devel/pkg-config` instead.
@@ -274,7 +275,7 @@ If using FreeBSD 12 or prior, use `devel/pkg-config` instead.
 For NetBSD +10.1:
 
 ```sh
-pkgin install git cmake boost fmtlib SDL3 catch2 libjwt spirv-headers spirv-tools ffmpeg7 libva nlohmann-json jq qt6-qtbase qt6-qtcharts qt6-qtmultimedia qt6-qttools cpp-httplib lz4 vulkan-headers nasm autoconf enet pkg-config libusb1 libcxx frozen
+pkgin install git cmake boost fmtlib SDL3 catch2 libjwt spirv-headers spirv-tools ffmpeg7 libva nlohmann-json jq libopus qt6-qtbase qt6-qtcharts qt6-qtmultimedia qt6-qttools cpp-httplib lz4 vulkan-headers nasm autoconf enet pkg-config libusb1 libcxx frozen
 ```
 
 [Caveats](./Caveats.md#netbsd).
@@ -305,7 +306,7 @@ pkg install gcc14 git cmake unzip nasm autoconf bash pkgconf ffmpeg glslang gmak
 <summary>OpenIndiana</summary>
 
 ```sh
-sudo pkg install git cmake qt6 boost glslang libzip library/lz4 libusb-1 nlohmann-json openssl sdl3 zlib compress/zstd unzip pkg-config nasm autoconf mesa library/libdrm header-drm developer/fmt
+sudo pkg install git cmake qt6 boost glslang libzip library/lz4 libusb-1 nlohmann-json openssl opus sdl3 zlib compress/zstd unzip pkg-config nasm autoconf mesa library/libdrm header-drm developer/fmt
 ```
 
 [Caveats](./Caveats.md#openindiana).
@@ -329,7 +330,7 @@ sudo pkgin install git cmake autoconf build-essential libusb-1 nasm gcc13
 
 ```sh
 BASE="git make autoconf libtool automake-wrapper jq patch"
-MINGW="qt6-base qt6-charts qt6-tools qt6-translations qt6-svg cmake toolchain clang python-pip openssl vulkan-memory-allocator vulkan-devel glslang boost fmt lz4 nlohmann-json zlib zstd enet libusb openssl SDL3"
+MINGW="qt6-base qt6-charts qt6-tools qt6-translations qt6-svg cmake toolchain clang python-pip openssl vulkan-memory-allocator vulkan-devel glslang boost fmt lz4 nlohmann-json zlib zstd enet opus libusb openssl SDL3"
 # Either x86_64 or clang-aarch64 (Windows on ARM)
 packages="$BASE"
 for pkg in $MINGW; do
@@ -355,7 +356,7 @@ pacman -Syuu --needed --noconfirm $packages
 <summary>HaikuOS</summary>
 
 ```sh
-pkgman install git cmake patch libfmt_devel nlohmann_json lz4_devel boost1.90_devel vulkan_devel qt6_base_devel qt6_declarative_devel libsdl3_devel ffmpeg7_devel libx11_devel enet_devel catch2_devel quazip1_qt5_devel qt6_5compat_devel glslang qt6_devel qt6_charts_devel cubeb_devel simpleini quazip_qt6_devel
+pkgman install git cmake patch libfmt_devel nlohmann_json lz4_devel opus_devel boost1.90_devel vulkan_devel qt6_base_devel qt6_declarative_devel libsdl3_devel ffmpeg7_devel libx11_devel enet_devel catch2_devel quazip1_qt5_devel qt6_5compat_devel glslang qt6_devel qt6_charts_devel cubeb_devel simpleini quazip_qt6_devel
 ```
 
 [Caveats](./Caveats.md#haikuos).

externals/CMakeLists.txt

@@ -195,6 +195,39 @@ else()
     endif()
 endif()
 
+# reshadefx
+if (ENABLE_RESHADE)
+    AddJsonPackage(NAME reshade DOWNLOAD_ONLY)
+
+    set(RESHADEFX_SHIM_DIR ${CMAKE_CURRENT_BINARY_DIR}/reshadefx_shim)
+    file(WRITE ${RESHADEFX_SHIM_DIR}/spirv.hpp "#include <spirv/unified1/spirv.hpp>\n")
+    file(WRITE ${RESHADEFX_SHIM_DIR}/GLSL.std.450.h "#include <spirv/unified1/GLSL.std.450.h>\n")
+
+    add_library(reshadefx STATIC
+        ${reshade_SOURCE_DIR}/source/effect_codegen_spirv.cpp
+        ${reshade_SOURCE_DIR}/source/effect_expression.cpp
+        ${reshade_SOURCE_DIR}/source/effect_lexer.cpp
+        ${reshade_SOURCE_DIR}/source/effect_parser_exp.cpp
+        ${reshade_SOURCE_DIR}/source/effect_parser_stmt.cpp
+        ${reshade_SOURCE_DIR}/source/effect_preprocessor.cpp
+        ${reshade_SOURCE_DIR}/source/effect_symbol_table.cpp
+    )
+
+    target_include_directories(reshadefx SYSTEM PUBLIC ${reshade_SOURCE_DIR}/source)
+    target_include_directories(reshadefx PRIVATE ${RESHADEFX_SHIM_DIR})
+    target_link_libraries(reshadefx PUBLIC SPIRV-Headers::SPIRV-Headers)
+
+    if (NOT MSVC)
+        target_compile_options(reshadefx PRIVATE -w)
+    else()
+        target_compile_options(reshadefx PRIVATE /w)
+    endif()
+
+    if (NOT TARGET reshadefx::reshadefx)
+        add_library(reshadefx::reshadefx ALIAS reshadefx)
+    endif()
+endif()
+
 # Catch2
 if (YUZU_TESTS OR DYNARMIC_TESTS)
     AddJsonPackage(catch2)

shell.nix

@@ -12,7 +12,7 @@ pkgs.mkShellNoCC {
     git cmake clang gnumake patch jq pkg-config
     # libraries
     openssl boost fmt nlohmann_json lz4 zlib zstd
-    enet vulkan-headers vulkan-utility-libraries
+    enet libopus vulkan-headers vulkan-utility-libraries
     spirv-tools spirv-headers vulkan-loader unzip
     glslang python3 httplib cpp-jwt ffmpeg-headless
     libusb1 cubeb

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/model/FxUniformSetting.kt

@@ -0,0 +1,103 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package org.yuzu.yuzu_emu.features.settings.model
+
+import org.yuzu.yuzu_emu.utils.NativePostProcessing
+import kotlin.math.roundToInt
+
+abstract class FxUniformSetting(
+    protected val index: Int,
+    protected val uniform: NativePostProcessing.Uniform,
+    protected val component: Int
+) : AbstractSetting {
+    override val key: String
+        get() = "fx_${index}_${uniform.name}_$component"
+
+    override val isRuntimeModifiable: Boolean
+        get() = true
+
+    override val pairedSettingKey: String
+        get() = ""
+
+    override val isSwitchable: Boolean
+        get() = false
+
+    override val isSaveable: Boolean
+        get() = true
+
+    override var global: Boolean
+        get() = true
+        set(_) {}
+
+    protected fun currentValue(): Float {
+        if (NativePostProcessing.hasValue(index, uniform.name)) {
+            return NativePostProcessing.getValue(index, uniform.name, component)
+        }
+        return uniform.defaultAt(component)
+    }
+
+    protected fun commit(value: Float) {
+        NativePostProcessing.setValue(index, uniform.name, component, value)
+        NativePostProcessing.store()
+    }
+
+    override fun reset() = commit(uniform.defaultAt(component))
+}
+
+class FxUniformSliderSetting(
+    index: Int,
+    uniform: NativePostProcessing.Uniform,
+    component: Int
+) : FxUniformSetting(index, uniform, component), AbstractIntSetting {
+    override val defaultValue: Any
+        get() = ((uniform.defaultAt(component) - uniform.min) / uniform.step).roundToInt()
+
+    override fun getInt(needsGlobal: Boolean): Int =
+        ((currentValue() - uniform.min) / uniform.step).roundToInt()
+
+    override fun setInt(value: Int) = commit(uniform.min + value * uniform.step)
+
+    override fun getValueAsString(needsGlobal: Boolean): String {
+        if (uniform.kind == NativePostProcessing.KIND_FLOAT) {
+            return String.format("%.3f", currentValue())
+        }
+        return currentValue().roundToInt().toString()
+    }
+}
+
+class FxUniformChoiceSetting(
+    index: Int,
+    uniform: NativePostProcessing.Uniform,
+    component: Int
+) : FxUniformSetting(index, uniform, component), AbstractIntSetting {
+    override val defaultValue: Any
+        get() = uniform.defaultAt(component).roundToInt()
+
+    override fun getInt(needsGlobal: Boolean): Int = currentValue().roundToInt()
+
+    override fun setInt(value: Int) = commit(value.toFloat())
+
+    override fun getValueAsString(needsGlobal: Boolean): String = getInt().toString()
+}
+
+class FxUniformBooleanSetting(
+    index: Int,
+    uniform: NativePostProcessing.Uniform,
+    component: Int
+) : FxUniformSetting(index, uniform, component), AbstractBooleanSetting {
+    override val defaultValue: Any
+        get() = uniform.defaultAt(component) != 0f
+
+    override fun getBoolean(needsGlobal: Boolean): Boolean = currentValue() != 0f
+
+    override fun setBoolean(value: Boolean) {
+        if (value) {
+            commit(1f)
+            return
+        }
+        commit(0f)
+    }
+
+    override fun getValueAsString(needsGlobal: Boolean): String = getBoolean().toString()
+}

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/model/Settings.kt

@@ -12,6 +12,7 @@ object Settings {
         SECTION_SYSTEM(R.string.preferences_system),
         SECTION_RENDERER(R.string.preferences_graphics),
         SECTION_FRAME_GEN(R.string.frame_gen),
+        SECTION_POST_PROCESSING(R.string.post_processing),
         SECTION_PERFORMANCE_STATS(R.string.stats_overlay_options),
         SECTION_INPUT_OVERLAY(R.string.input_overlay_options),
         SECTION_SOC_OVERLAY(R.string.soc_overlay_options),

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/model/StringSetting.kt

@@ -13,6 +13,7 @@ enum class StringSetting(override val key: String) : AbstractStringSetting {
     DEVICE_NAME("device_name"),
     LOG_FILTER("log_filter"),
     PROGRAM_ARGS("program_args"),
+    POST_SHADER_CHAIN("post_shader_chain"),
 
     WEB_TOKEN("eden_token"),
     WEB_USERNAME("eden_username")

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/ui/SettingsFragmentPresenter.kt

@@ -18,6 +18,9 @@ import org.yuzu.yuzu_emu.features.input.model.NpadStyleIndex
 import org.yuzu.yuzu_emu.features.settings.model.AbstractBooleanSetting
 import org.yuzu.yuzu_emu.features.settings.model.AbstractIntSetting
 import org.yuzu.yuzu_emu.features.settings.model.BooleanSetting
+import org.yuzu.yuzu_emu.features.settings.model.FxUniformBooleanSetting
+import org.yuzu.yuzu_emu.features.settings.model.FxUniformChoiceSetting
+import org.yuzu.yuzu_emu.features.settings.model.FxUniformSliderSetting
 import org.yuzu.yuzu_emu.features.settings.model.ByteSetting
 import org.yuzu.yuzu_emu.features.settings.model.IntSetting
 import org.yuzu.yuzu_emu.features.settings.model.LongSetting
@@ -30,6 +33,7 @@ import org.yuzu.yuzu_emu.features.settings.model.view.*
 import org.yuzu.yuzu_emu.utils.InputHandler
 import org.yuzu.yuzu_emu.utils.LosslessScalingHelper
 import org.yuzu.yuzu_emu.utils.NativeConfig
+import org.yuzu.yuzu_emu.utils.NativePostProcessing
 import org.yuzu.yuzu_emu.utils.DirectoryInitialization
 import org.yuzu.yuzu_emu.utils.FullscreenHelper
 import androidx.core.content.edit
@@ -163,6 +167,7 @@ class SettingsFragmentPresenter(
             MenuTag.SECTION_SYSTEM -> addSystemSettings(sl)
             MenuTag.SECTION_RENDERER -> addGraphicsSettings(sl)
             MenuTag.SECTION_FRAME_GEN -> addFrameGenSettings(sl)
+            MenuTag.SECTION_POST_PROCESSING -> addPostProcessingSettings(sl)
             MenuTag.SECTION_PERFORMANCE_STATS -> addPerformanceOverlaySettings(sl)
             MenuTag.SECTION_SOC_OVERLAY -> addSocOverlaySettings(sl)
             MenuTag.SECTION_INPUT_OVERLAY -> addInputOverlaySettings(sl)
@@ -190,6 +195,219 @@ class SettingsFragmentPresenter(
         }
     }
 
+    private fun addPostProcessingSettings(sl: ArrayList<SettingsItem>) {
+        val usable = NativePostProcessing.catalog().filter { it.valid }
+
+        sl.apply {
+            add(
+                RunnableSetting(
+                    titleId = R.string.post_processing_reload,
+                    descriptionId = R.string.post_processing_reload_description,
+                    isRunnable = true
+                ) {
+                    NativePostProcessing.reload()
+                    settingsViewModel.setReloadListAndNotifyDataset(true)
+                }
+            )
+
+            if (usable.isEmpty()) {
+                add(
+                    RunnableSetting(
+                        titleId = R.string.post_processing_empty,
+                        descriptionString = NativePostProcessing.getShaderDirectory(),
+                        isRunnable = false
+                    ) {}
+                )
+                return@apply
+            }
+
+            val labels = mutableListOf<String>()
+            val files = mutableListOf<String>()
+            val techniques = mutableListOf<String>()
+            for (effect in usable) {
+                for (technique in effect.techniques) {
+                    if (effect.techniques.size == 1) {
+                        labels.add(effect.name)
+                    } else {
+                        labels.add(effect.name + " \u00b7 " + technique)
+                    }
+                    files.add(effect.file)
+                    techniques.add(technique)
+                }
+            }
+
+            val chain = NativePostProcessing.chain()
+            for (index in chain.indices) {
+                val entry = chain[index]
+                val effect = usable.firstOrNull { it.file == entry.file }
+
+                var header = entry.file
+                if (effect != null) {
+                    header = effect.name
+                }
+                add(HeaderSetting(titleString = header))
+
+                add(
+                    IntSingleChoiceSetting(
+                        buildSlotSelector(index, entry, files, techniques),
+                        titleId = R.string.post_processing_effect,
+                        choices = labels.toTypedArray(),
+                        values = labels.indices.toList().toTypedArray()
+                    )
+                )
+
+                if (effect != null) {
+                    for (uniform in effect.uniforms) {
+                        addUniform(this, index, uniform)
+                    }
+                }
+
+                if (index > 0) {
+                    add(
+                        RunnableSetting(
+                            titleId = R.string.post_processing_move_up,
+                            isRunnable = true
+                        ) {
+                            NativePostProcessing.move(index, -1)
+                            NativePostProcessing.store()
+                            settingsViewModel.setReloadListAndNotifyDataset(true)
+                        }
+                    )
+                }
+                if (index < chain.size - 1) {
+                    add(
+                        RunnableSetting(
+                            titleId = R.string.post_processing_move_down,
+                            isRunnable = true
+                        ) {
+                            NativePostProcessing.move(index, 1)
+                            NativePostProcessing.store()
+                            settingsViewModel.setReloadListAndNotifyDataset(true)
+                        }
+                    )
+                }
+                add(
+                    RunnableSetting(
+                        titleId = R.string.post_processing_reset,
+                        isRunnable = true
+                    ) {
+                        NativePostProcessing.resetValues(index)
+                        NativePostProcessing.store()
+                        settingsViewModel.setReloadListAndNotifyDataset(true)
+                    }
+                )
+                add(
+                    RunnableSetting(
+                        titleId = R.string.post_processing_remove,
+                        isRunnable = true
+                    ) {
+                        NativePostProcessing.remove(index)
+                        NativePostProcessing.store()
+                        settingsViewModel.setReloadListAndNotifyDataset(true)
+                    }
+                )
+            }
+
+            add(
+                RunnableSetting(
+                    titleId = R.string.post_processing_add,
+                    isRunnable = true
+                ) {
+                    NativePostProcessing.append(files[0], techniques[0])
+                    NativePostProcessing.store()
+                    settingsViewModel.setReloadListAndNotifyDataset(true)
+                }
+            )
+        }
+    }
+
+    private fun buildSlotSelector(
+        index: Int,
+        entry: NativePostProcessing.ChainEntry,
+        files: List<String>,
+        techniques: List<String>
+    ): AbstractIntSetting = object : AbstractIntSetting {
+        override val key = "fx_slot_$index"
+
+        override fun getInt(needsGlobal: Boolean): Int {
+            for (i in files.indices) {
+                if (files[i] == entry.file && techniques[i] == entry.technique) {
+                    return i
+                }
+            }
+            return -1
+        }
+
+        override fun setInt(value: Int) {
+            NativePostProcessing.replace(index, files[value], techniques[value])
+            NativePostProcessing.store()
+            settingsViewModel.setReloadListAndNotifyDataset(true)
+        }
+
+        override val defaultValue = 0
+        override fun getValueAsString(needsGlobal: Boolean): String = getInt().toString()
+        override fun reset() {}
+        override val isRuntimeModifiable = true
+        override val pairedSettingKey = ""
+        override val isSwitchable = false
+        override val isSaveable = true
+        override var global: Boolean
+            get() = true
+            set(_) {}
+    }
+
+    private fun addUniform(
+        sl: ArrayList<SettingsItem>,
+        index: Int,
+        uniform: NativePostProcessing.Uniform
+    ) {
+        if (uniform.uiType == NativePostProcessing.UI_CHECKBOX ||
+            uniform.kind == NativePostProcessing.KIND_BOOL
+        ) {
+            sl.add(
+                SwitchSetting(
+                    FxUniformBooleanSetting(index, uniform, 0),
+                    titleString = uniform.label,
+                    descriptionString = uniform.tooltip
+                )
+            )
+            return
+        }
+
+        if (uniform.items.isNotEmpty() &&
+            (uniform.uiType == NativePostProcessing.UI_COMBO ||
+                uniform.uiType == NativePostProcessing.UI_RADIO)
+        ) {
+            sl.add(
+                IntSingleChoiceSetting(
+                    FxUniformChoiceSetting(index, uniform, 0),
+                    titleString = uniform.label,
+                    descriptionString = uniform.tooltip,
+                    choices = uniform.items.toTypedArray(),
+                    values = uniform.items.indices.toList().toTypedArray()
+                )
+            )
+            return
+        }
+
+        for (component in 0 until uniform.components) {
+            var title = uniform.label
+            if (uniform.components > 1) {
+                title = uniform.label + " [" + component + "]"
+            }
+            sl.add(
+                SliderSetting(
+                    FxUniformSliderSetting(index, uniform, component),
+                    titleString = title,
+                    descriptionString = uniform.tooltip,
+                    min = 0,
+                    max = uniform.steps
+                )
+            )
+        }
+    }
+
+
     private fun addConfigSettings(sl: ArrayList<SettingsItem>) {
         sl.apply {
             add(

src/android/app/src/main/java/org/yuzu/yuzu_emu/fragments/GamePropertiesFragment.kt

@@ -383,6 +383,20 @@ class GamePropertiesFragment : Fragment() {
                     }
                 )
             )
+            add(
+                SubmenuProperty(
+                    R.string.post_processing,
+                    R.string.post_processing_per_game_description,
+                    R.drawable.ic_post_processing,
+                    action = {
+                        val action = HomeNavigationDirections.actionGlobalSettingsActivity(
+                            args.game,
+                            Settings.MenuTag.SECTION_POST_PROCESSING
+                        )
+                        binding.root.findNavController().navigate(action)
+                    }
+                )
+            )
 
             if (GpuDriverHelper.isAdrenoGpu()) {
                 add(

src/android/app/src/main/java/org/yuzu/yuzu_emu/fragments/HomeSettingsFragment.kt

@@ -171,6 +171,20 @@ class HomeSettingsFragment : Fragment() {
                     )
                 )
             }
+            add(
+                HomeSetting(
+                    R.string.post_processing,
+                    R.string.post_processing_description,
+                    R.drawable.ic_post_processing,
+                    {
+                        val action = HomeNavigationDirections.actionGlobalSettingsActivity(
+                            null,
+                            Settings.MenuTag.SECTION_POST_PROCESSING
+                        )
+                        binding.root.findNavController().navigate(action)
+                    }
+                )
+            )
             add(
                 HomeSetting(
                     R.string.lossless_scaling,

src/android/app/src/main/java/org/yuzu/yuzu_emu/fragments/LicensesFragment.kt

@@ -79,6 +79,13 @@ class LicensesFragment : Fragment() {
                 R.string.license_ffmpeg_copyright,
                 R.string.license_ffmpeg_text
             ),
+            License(
+                R.string.license_opus,
+                R.string.license_opus_description,
+                R.string.license_opus_link,
+                R.string.license_opus_copyright,
+                R.string.license_opus_text
+            ),
             License(
                 R.string.license_sirit,
                 R.string.license_sirit_description,

src/android/app/src/main/java/org/yuzu/yuzu_emu/utils/NativePostProcessing.kt

@@ -0,0 +1,175 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package org.yuzu.yuzu_emu.utils
+
+import org.json.JSONArray
+import org.json.JSONObject
+
+object NativePostProcessing {
+    const val KIND_BOOL = 0
+    const val KIND_INT = 1
+    const val KIND_FLOAT = 2
+
+    const val UI_HIDDEN = 0
+    const val UI_SLIDER = 1
+    const val UI_DRAG = 2
+    const val UI_COMBO = 3
+    const val UI_RADIO = 4
+    const val UI_CHECKBOX = 5
+    const val UI_COLOR = 6
+    const val UI_INPUT_BOX = 7
+
+    external fun getCatalogJson(): String
+
+    external fun getChainJson(): String
+
+    external fun append(file: String, technique: String)
+
+    external fun replace(index: Int, file: String, technique: String)
+
+    external fun remove(index: Int)
+
+    external fun move(index: Int, delta: Int)
+
+    external fun resetValues(index: Int)
+
+    external fun getValue(index: Int, uniform: String, component: Int): Float
+
+    external fun hasValue(index: Int, uniform: String): Boolean
+
+    external fun setValue(index: Int, uniform: String, component: Int, value: Float)
+
+    external fun store()
+
+    external fun reload()
+
+    external fun getShaderDirectory(): String
+
+    data class Uniform(
+        val name: String,
+        val label: String,
+        val tooltip: String,
+        val category: String,
+        val kind: Int,
+        val uiType: Int,
+        val components: Int,
+        val min: Float,
+        val max: Float,
+        val step: Float,
+        val items: List<String>,
+        val defaults: List<Float>
+    ) {
+        val steps: Int
+            get() {
+                val span = max - min
+                if (step <= 0f) {
+                    return 1
+                }
+                val count = Math.round(span / step)
+                if (count < 1) {
+                    return 1
+                }
+                return count
+            }
+
+        fun defaultAt(component: Int): Float {
+            if (component < defaults.size) {
+                return defaults[component]
+            }
+            return 0f
+        }
+    }
+
+    data class Effect(
+        val file: String,
+        val name: String,
+        val error: String,
+        val techniques: List<String>,
+        val uniforms: List<Uniform>
+    ) {
+        val valid: Boolean
+            get() = error.isEmpty() && techniques.isNotEmpty()
+    }
+
+    data class ChainEntry(val file: String, val technique: String)
+
+    fun catalog(): List<Effect> {
+        val out = mutableListOf<Effect>()
+        val array = JSONArray(getCatalogJson())
+        for (i in 0 until array.length()) {
+            val obj = array.getJSONObject(i)
+            out.add(
+                Effect(
+                    file = obj.optString("file"),
+                    name = obj.optString("name"),
+                    error = obj.optString("error"),
+                    techniques = obj.optJSONArray("techniques").toStringList(),
+                    uniforms = obj.optJSONArray("uniforms").toUniformList()
+                )
+            )
+        }
+        return out
+    }
+
+    fun chain(): List<ChainEntry> {
+        val out = mutableListOf<ChainEntry>()
+        val array = JSONArray(getChainJson())
+        for (i in 0 until array.length()) {
+            val obj = array.getJSONObject(i)
+            out.add(ChainEntry(obj.optString("file"), obj.optString("technique")))
+        }
+        return out
+    }
+
+    fun findEffect(file: String): Effect? = catalog().firstOrNull { it.file == file }
+
+    private fun JSONArray?.toStringList(): List<String> {
+        if (this == null) {
+            return emptyList()
+        }
+        val out = mutableListOf<String>()
+        for (i in 0 until length()) {
+            out.add(optString(i))
+        }
+        return out
+    }
+
+    private fun JSONArray?.toFloatList(): List<Float> {
+        if (this == null) {
+            return emptyList()
+        }
+        val out = mutableListOf<Float>()
+        for (i in 0 until length()) {
+            out.add(optDouble(i, 0.0).toFloat())
+        }
+        return out
+    }
+
+    private fun JSONArray?.toUniformList(): List<Uniform> {
+        if (this == null) {
+            return emptyList()
+        }
+        val out = mutableListOf<Uniform>()
+        for (i in 0 until length()) {
+            val obj: JSONObject = optJSONObject(i) ?: continue
+            out.add(
+                Uniform(
+                    name = obj.optString("name"),
+                    label = obj.optString("label"),
+                    tooltip = obj.optString("tooltip"),
+                    category = obj.optString("category"),
+                    kind = obj.optInt("kind", KIND_FLOAT),
+                    uiType = obj.optInt("uiType", UI_HIDDEN),
+                    components = obj.optInt("components", 1),
+                    min = obj.optDouble("min", 0.0).toFloat(),
+                    max = obj.optDouble("max", 1.0).toFloat(),
+                    step = obj.optDouble("step", 0.01).toFloat(),
+                    items = obj.optJSONArray("items").toStringList(),
+                    defaults = obj.optJSONArray("defaults").toFloatList()
+                )
+            )
+        }
+        return out
+    }
+}

src/android/app/src/main/jni/CMakeLists.txt

@@ -17,6 +17,7 @@ add_library(yuzu-android SHARED
     android_config.cpp
     android_config.h
     native_input.cpp
+    native_post_processing.cpp
 )
 
 set_property(TARGET yuzu-android PROPERTY IMPORTED_LOCATION ${FFmpeg_LIBRARY_DIR})

src/android/app/src/main/jni/native_post_processing.cpp

@@ -0,0 +1,196 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <string>
+
+#include <jni.h>
+#include <nlohmann/json.hpp>
+
+#include "common/android/android_common.h"
+#ifdef HAS_RESHADE
+#include "video_core/post_processing/fx_chain.h"
+#include "video_core/post_processing/fx_effect.h"
+#endif
+
+namespace {
+
+#ifdef HAS_RESHADE
+nlohmann::json SerializeUniform(const VideoCore::FxUniformDesc& uniform) {
+    nlohmann::json out;
+    out["name"] = uniform.name;
+    out["label"] = uniform.label;
+    out["tooltip"] = uniform.tooltip;
+    out["category"] = uniform.category;
+    out["kind"] = static_cast<int>(uniform.kind);
+    out["uiType"] = static_cast<int>(uniform.ui_type);
+    out["components"] = uniform.components;
+    out["min"] = uniform.ui_min;
+    out["max"] = uniform.ui_max;
+    out["step"] = uniform.ui_step;
+    out["items"] = uniform.items;
+
+    nlohmann::json defaults = nlohmann::json::array();
+    for (u32 i = 0; i < uniform.components; ++i) {
+        defaults.push_back(uniform.default_value[i]);
+    }
+    out["defaults"] = defaults;
+
+    return out;
+}
+#endif
+
+} // Anonymous namespace
+
+extern "C" {
+
+jstring Java_org_yuzu_yuzu_1emu_utils_NativePostProcessing_getCatalogJson(JNIEnv* env,
+                                                                         jobject obj) {
+    nlohmann::json out = nlohmann::json::array();
+
+#ifdef HAS_RESHADE
+    for (const auto& effect : VideoCore::GetFxCatalog()) {
+        nlohmann::json entry;
+        entry["file"] = effect.file;
+        entry["name"] = effect.name;
+        entry["error"] = effect.error;
+        entry["techniques"] = effect.techniques;
+
+        nlohmann::json uniforms = nlohmann::json::array();
+        for (const auto& uniform : effect.uniforms) {
+            uniforms.push_back(SerializeUniform(uniform));
+        }
+        entry["uniforms"] = uniforms;
+
+        out.push_back(entry);
+    }
+#endif
+
+    return Common::Android::ToJString(env, out.dump());
+}
+
+jstring Java_org_yuzu_yuzu_1emu_utils_NativePostProcessing_getChainJson(JNIEnv* env, jobject obj) {
+    nlohmann::json out = nlohmann::json::array();
+
+#ifdef HAS_RESHADE
+    for (const auto& entry : VideoCore::FxChain::Instance().Entries()) {
+        nlohmann::json item;
+        item["file"] = entry.file;
+        item["technique"] = entry.technique;
+
+        nlohmann::json values = nlohmann::json::object();
+        for (const auto& [name, value] : entry.values) {
+            values[name] = {value[0], value[1], value[2], value[3]};
+        }
+        item["values"] = values;
+
+        out.push_back(item);
+    }
+#endif
+
+    return Common::Android::ToJString(env, out.dump());
+}
+
+void Java_org_yuzu_yuzu_1emu_utils_NativePostProcessing_append(JNIEnv* env, jobject obj,
+                                                               jstring jfile, jstring jtechnique) {
+#ifdef HAS_RESHADE
+    VideoCore::FxChain::Instance().Append(Common::Android::GetJString(env, jfile),
+                                          Common::Android::GetJString(env, jtechnique));
+#endif
+}
+
+void Java_org_yuzu_yuzu_1emu_utils_NativePostProcessing_replace(JNIEnv* env, jobject obj,
+                                                                jint index, jstring jfile,
+                                                                jstring jtechnique) {
+#ifdef HAS_RESHADE
+    VideoCore::FxChain::Instance().Replace(static_cast<size_t>(index),
+                                           Common::Android::GetJString(env, jfile),
+                                           Common::Android::GetJString(env, jtechnique));
+#endif
+}
+
+void Java_org_yuzu_yuzu_1emu_utils_NativePostProcessing_remove(JNIEnv* env, jobject obj,
+                                                               jint index) {
+#ifdef HAS_RESHADE
+    VideoCore::FxChain::Instance().Remove(static_cast<size_t>(index));
+#endif
+}
+
+void Java_org_yuzu_yuzu_1emu_utils_NativePostProcessing_move(JNIEnv* env, jobject obj, jint index,
+                                                             jint delta) {
+#ifdef HAS_RESHADE
+    VideoCore::FxChain::Instance().Move(static_cast<size_t>(index), delta);
+#endif
+}
+
+void Java_org_yuzu_yuzu_1emu_utils_NativePostProcessing_resetValues(JNIEnv* env, jobject obj,
+                                                                    jint index) {
+#ifdef HAS_RESHADE
+    VideoCore::FxChain::Instance().ResetValues(static_cast<size_t>(index));
+#endif
+}
+
+jfloat Java_org_yuzu_yuzu_1emu_utils_NativePostProcessing_getValue(JNIEnv* env, jobject obj,
+                                                                   jint index, jstring juniform,
+                                                                   jint component) {
+#ifdef HAS_RESHADE
+    if (component < 0 || component >= 4) {
+        return 0.0f;
+    }
+    const auto value = VideoCore::FxChain::Instance().GetValue(
+        static_cast<size_t>(index), Common::Android::GetJString(env, juniform));
+    return value[static_cast<size_t>(component)];
+#else
+    return 0.0f;
+#endif
+}
+
+jboolean Java_org_yuzu_yuzu_1emu_utils_NativePostProcessing_hasValue(JNIEnv* env, jobject obj,
+                                                                     jint index,
+                                                                     jstring juniform) {
+#ifdef HAS_RESHADE
+    return static_cast<jboolean>(VideoCore::FxChain::Instance().HasValue(
+        static_cast<size_t>(index), Common::Android::GetJString(env, juniform)));
+#else
+    return static_cast<jboolean>(false);
+#endif
+}
+
+void Java_org_yuzu_yuzu_1emu_utils_NativePostProcessing_setValue(JNIEnv* env, jobject obj,
+                                                                  jint index, jstring juniform,
+                                                                  jint component, jfloat value) {
+#ifdef HAS_RESHADE
+    if (component < 0 || component >= 4) {
+        return;
+    }
+    const std::string uniform = Common::Android::GetJString(env, juniform);
+    auto& chain = VideoCore::FxChain::Instance();
+
+    auto current = chain.GetValue(static_cast<size_t>(index), uniform);
+    current[static_cast<size_t>(component)] = value;
+    chain.SetValue(static_cast<size_t>(index), uniform, current);
+#endif
+}
+
+void Java_org_yuzu_yuzu_1emu_utils_NativePostProcessing_store(JNIEnv* env, jobject obj) {
+#ifdef HAS_RESHADE
+    VideoCore::FxChain::Instance().StoreToSettings();
+#endif
+}
+
+void Java_org_yuzu_yuzu_1emu_utils_NativePostProcessing_reload(JNIEnv* env, jobject obj) {
+#ifdef HAS_RESHADE
+    VideoCore::ReloadFxCatalog();
+    VideoCore::FxChain::Instance().DropUnknownEntries();
+#endif
+}
+
+jstring Java_org_yuzu_yuzu_1emu_utils_NativePostProcessing_getShaderDirectory(JNIEnv* env,
+                                                                              jobject obj) {
+#ifdef HAS_RESHADE
+    return Common::Android::ToJString(env, VideoCore::GetFxRootDirectory().string());
+#else
+    return Common::Android::ToJString(env, "");
+#endif
+}
+
+} // extern "C"

src/android/app/src/main/res/drawable/ic_post_processing.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="?attr/colorControlNormal"
+        android:fillType="evenOdd"
+        android:pathData="M8.5,3 L19.4,3 Q21,3 21,4.6 L21,16.5 L19.4,16.5 L19.4,4.6 L8.5,4.6 Z M5,7 L15,7 Q17,7 17,9 L17,19 Q17,21 15,21 L5,21 Q3,21 3,19 L3,9 Q3,7 5,7 Z M5.2,8.6 L14.8,8.6 Q15.4,8.6 15.4,9.2 L15.4,18.8 Q15.4,19.4 14.8,19.4 L5.2,19.4 Q4.6,19.4 4.6,18.8 L4.6,9.2 Q4.6,8.6 5.2,8.6 Z M10,10.9 A3.1,3.1 0 0 1 10,17.1 Z"/>
+</vector>

src/android/app/src/main/res/values/strings.xml

@@ -298,6 +298,18 @@
     <string name="gpu_driver_fetcher">GPU driver fetcher</string>
     <string name="gpu_driver_manager">GPU driver manager</string>
     <string name="install_gpu_driver_description">Install alternative drivers for potentially better performance or accuracy</string>
+    <string name="post_processing">Post-Processing Effects</string>
+    <string name="post_processing_description">ReShade FX effects applied after rendering</string>
+    <string name="post_processing_per_game_description">Configure the effect chain for this game</string>
+    <string name="post_processing_effect">Effect</string>
+    <string name="post_processing_add">Add effect</string>
+    <string name="post_processing_remove">Remove</string>
+    <string name="post_processing_move_up">Move up</string>
+    <string name="post_processing_move_down">Move down</string>
+    <string name="post_processing_reset">Reset to defaults</string>
+    <string name="post_processing_reload">Reload from disk</string>
+    <string name="post_processing_reload_description">Rescan the shader folder for .fx files</string>
+    <string name="post_processing_empty">No effects found. Place .fx files in this folder:</string>
     <string name="frame_gen">Frame generation</string>
     <string name="frame_gen_per_game_description">Configure frame generation for this game</string>
     <string name="frame_gen_description">Insert interpolated frames between rendered ones using Lossless Scaling. Forces FIFO presentation while enabled.</string>
@@ -1762,6 +1774,51 @@ RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
 FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
 SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
 DAMAGES.
+    </string>
+    <string name="license_opus" translatable="false">Opus</string>
+    <string name="license_opus_description" translatable="false">Modern audio compression for the internet</string>
+    <string name="license_opus_link" translatable="false">https://github.com/xiph/opus</string>
+    <string name="license_opus_copyright" translatable="false">Copyright 2001–2011 Xiph.Org, Skype Limited, Octasic, Jean-Marc Valin, Timothy B. Terriberry, CSIRO, Gregory Maxwell, Mark Borgerding, Erik de Castro Lopo</string>
+    <string name="license_opus_text" translatable="false">
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:\n\n
+
+- Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.\n\n
+
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.\n\n
+
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.\n\n
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+``AS IS\'\' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n\n
+
+Opus is subject to the royalty-free patent licenses which are
+specified at:\n\n
+
+Xiph.Org Foundation:
+https://datatracker.ietf.org/ipr/1524/ \n\n
+
+Microsoft Corporation:
+https://datatracker.ietf.org/ipr/1914/ \n\n
+
+Broadcom Corporation:
+https://datatracker.ietf.org/ipr/1526/
     </string>
     <string name="license_sirit" translatable="false">Sirit</string>
     <string name="license_sirit_description" translatable="false">A runtime SPIR-V assembler</string>

src/audio_core/CMakeLists.txt

@@ -226,14 +226,8 @@ else()
         $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-sign-conversion>)
 endif()
 
-if (YUZU_USE_EXTERNAL_FFMPEG)
-    add_dependencies(audio_core ffmpeg-build)
-endif()
-target_include_directories(audio_core PUBLIC ${FFmpeg_INCLUDE_DIR})
-target_link_libraries(audio_core PRIVATE ${FFmpeg_LIBRARIES})
-target_link_options(audio_core PRIVATE ${FFmpeg_LDFLAGS})
-
-target_link_libraries(audio_core PUBLIC common core)
+target_include_directories(audio_core PRIVATE ${OPUS_INCLUDE_DIRS})
+target_link_libraries(audio_core PUBLIC common core Opus::opus)
 
 if (ENABLE_CUBEB)
     target_sources(audio_core PRIVATE

src/audio_core/adsp/apps/opus/opus_decode_object.cpp

@@ -1,72 +1,107 @@
-// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
-// SPDX-License-Identifier: GPL-3.0-or-later
-
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-extern "C" {
-#include <libavcodec/avcodec.h>
-#include <libavcodec/codec.h>
-#include <libavcodec/packet.h>
-#include <libavutil/channel_layout.h>
-#include <libavutil/frame.h>
-}
-
 #include "audio_core/adsp/apps/opus/opus_decode_object.h"
-#include "core/hle/service/audio/errors.h"
+#include "common/assert.h"
 
 namespace AudioCore::ADSP::OpusDecoder {
+namespace {
+bool IsValidChannelCount(u32 channel_count) {
+    return channel_count == 1 || channel_count == 2;
+}
+} // namespace
 
 u32 OpusDecodeObject::GetWorkBufferSize(u32 channel_count) {
-    if (channel_count == 1 || channel_count == 2)
-        return u32(sizeof(OpusDecodeObject)) + 16 * channel_count;
-    return 0;
-}
-
-Result OpusDecodeObject::InitializeDecoder(u32 sample_rate, u32 channel_count) {
-    if ((codec = avcodec_find_decoder(AV_CODEC_ID_OPUS)) == nullptr)
-        return Service::Audio::ResultLibOpusInvalidState;
-    if ((avctx = avcodec_alloc_context3(codec)) == nullptr)
-        return Service::Audio::ResultLibOpusInvalidState;
-    avctx->sample_rate = sample_rate;
-    av_channel_layout_default(&avctx->ch_layout, channel_count);
-    return ResultSuccess;
-}
-
-Result OpusDecodeObject::Shutdown() {
-    if (avctx) {
-        avcodec_free_context(&avctx);
-        avctx = nullptr;
+    if (!IsValidChannelCount(channel_count)) {
+        return 0;
     }
-    return ResultSuccess;
+    return static_cast<u32>(sizeof(OpusDecodeObject)) + opus_decoder_get_size(channel_count);
 }
 
-Result OpusDecodeObject::ResetDecoder() {
-    if (avctx) {
-        avcodec_flush_buffers(avctx);
-        return ResultSuccess;
+OpusDecodeObject& OpusDecodeObject::Initialize(u64 buffer, u64 buffer2) {
+    auto* new_decoder = reinterpret_cast<OpusDecodeObject*>(buffer);
+    auto* comparison = reinterpret_cast<OpusDecodeObject*>(buffer2);
+
+    if (new_decoder->magic == DecodeObjectMagic) {
+        if (!new_decoder->initialized ||
+            (new_decoder->initialized && new_decoder->self == comparison)) {
+            new_decoder->state_valid = true;
+        }
+    } else {
+        new_decoder->initialized = false;
+        new_decoder->state_valid = true;
     }
-    return Service::Audio::ResultLibOpusInvalidState;
+    return *new_decoder;
 }
 
-Result OpusDecodeObject::Decode(u32& out_sample_count, u64 output_data, u64 output_data_size, u64 input_data, u64 input_data_size) {
+s32 OpusDecodeObject::InitializeDecoder(u32 sample_rate, u32 channel_count) {
+    if (!state_valid) {
+        return OPUS_INVALID_STATE;
+    }
+
+    if (initialized) {
+        return OPUS_OK;
+    }
+
+    // Unfortunately libopus does not expose the OpusDecoder struct publicly, so we can't include
+    // it in this class. Nintendo does not allocate memory, which is why we have a workbuffer
+    // provided.
+    // We could use _create and have libopus allocate it for us, but then we have to separately
+    // track which decoder is being used between this and multistream in order to call the correct
+    // destroy from the host side.
+    // This is a bit cringe, but is safe as these objects are only ever initialized inside the given
+    // workbuffer, and GetWorkBufferSize will guarantee there's enough space to follow.
+    decoder = (LibOpusDecoder*)(this + 1);
+    s32 ret = opus_decoder_init(decoder, sample_rate, channel_count);
+    if (ret == OPUS_OK) {
+        magic = DecodeObjectMagic;
+        initialized = true;
+        state_valid = true;
+        self = this;
+        final_range = 0;
+    }
+    return ret;
+}
+
+s32 OpusDecodeObject::Shutdown() {
+    if (!state_valid) {
+        return OPUS_INVALID_STATE;
+    }
+
+    if (initialized) {
+        magic = 0x0;
+        initialized = false;
+        state_valid = false;
+        self = nullptr;
+        final_range = 0;
+        decoder = nullptr;
+    }
+    return OPUS_OK;
+}
+
+s32 OpusDecodeObject::ResetDecoder() {
+    return opus_decoder_ctl(decoder, OPUS_RESET_STATE);
+}
+
+s32 OpusDecodeObject::Decode(u32& out_sample_count, u64 output_data, u64 output_data_size,
+                             u64 input_data, u64 input_data_size) {
+    ASSERT(initialized);
     out_sample_count = 0;
-    if (avctx) {
-        AVPacket* avpkt = av_packet_alloc();
-        av_new_packet(avpkt, int(input_data_size));
-        std::memcpy(avpkt->data, reinterpret_cast<const u8*>(input_data), input_data_size);
-        avcodec_send_packet(avctx, avpkt);
 
-        AVFrame* frame = av_frame_alloc();
-        avcodec_receive_frame(avctx, frame);
-        std::memcpy(reinterpret_cast<u16*>(output_data), frame->data, output_data_size);
-        av_frame_free(&frame);
-        av_packet_free(&avpkt);
-
-        out_sample_count = frame->nb_samples;
-        return ResultSuccess;
+    if (!state_valid) {
+        return OPUS_INVALID_STATE;
     }
-    return Service::Audio::ResultLibOpusInvalidState;
+
+    auto ret_code_or_samples = opus_decode(
+        decoder, reinterpret_cast<const u8*>(input_data), static_cast<opus_int32>(input_data_size),
+        reinterpret_cast<opus_int16*>(output_data), static_cast<opus_int32>(output_data_size), 0);
+
+    if (ret_code_or_samples < OPUS_OK) {
+        return ret_code_or_samples;
+    }
+
+    out_sample_count = ret_code_or_samples;
+    return opus_decoder_ctl(decoder, OPUS_GET_FINAL_RANGE_REQUEST, &final_range);
 }
 
 } // namespace AudioCore::ADSP::OpusDecoder

src/audio_core/adsp/apps/opus/opus_decode_object.h

@@ -1,30 +1,38 @@
-// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
-// SPDX-License-Identifier: GPL-3.0-or-later
-
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #pragma once
 
-#include "common/common_types.h"
-#include "core/hle/result.h"
+#include <opus.h>
 
-struct AVCodec;
-struct AVCodecContext;
+#include "common/common_types.h"
 
 namespace AudioCore::ADSP::OpusDecoder {
+using LibOpusDecoder = ::OpusDecoder;
+static constexpr u32 DecodeObjectMagic = 0xDEADBEEF;
 
 class OpusDecodeObject {
 public:
     static u32 GetWorkBufferSize(u32 channel_count);
+    static OpusDecodeObject& Initialize(u64 buffer, u64 buffer2);
 
-    Result InitializeDecoder(u32 sample_rate, u32 channel_count);
-    Result Shutdown();
-    Result ResetDecoder();
-    Result Decode(u32& out_sample_count, u64 output_data, u64 output_data_size, u64 input_data, u64 input_data_size);
+    s32 InitializeDecoder(u32 sample_rate, u32 channel_count);
+    s32 Shutdown();
+    s32 ResetDecoder();
+    s32 Decode(u32& out_sample_count, u64 output_data, u64 output_data_size, u64 input_data,
+               u64 input_data_size);
+    u32 GetFinalRange() const noexcept {
+        return final_range;
+    }
 
-    AVCodec const* codec = nullptr;
-    AVCodecContext* avctx = nullptr;
+private:
+    u32 magic;
+    bool initialized;
+    bool state_valid;
+    OpusDecodeObject* self;
+    u32 final_range;
+    LibOpusDecoder* decoder;
 };
+static_assert(std::is_trivially_constructible_v<OpusDecodeObject>);
 
 } // namespace AudioCore::ADSP::OpusDecoder

src/audio_core/adsp/apps/opus/opus_decoder.cpp

@@ -5,16 +5,17 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <array>
+#include <chrono>
 
 #include "audio_core/adsp/apps/opus/opus_decode_object.h"
 #include "audio_core/adsp/apps/opus/opus_multistream_decode_object.h"
 #include "audio_core/adsp/apps/opus/shared_memory.h"
 #include "audio_core/audio_core.h"
+#include "audio_core/common/common.h"
 #include "common/logging.h"
 #include "common/thread.h"
 #include "core/core.h"
 #include "core/core_timing.h"
-#include "core/hle/service/audio/errors.h"
 
 namespace AudioCore::ADSP::OpusDecoder {
 
@@ -48,16 +49,11 @@ OpusDecoder::~OpusDecoder() {
     // Shutdown the thread
     Send(Direction::DSP, Message::Shutdown);
     auto msg = Receive(Direction::Host);
-    ASSERT_MSG(msg == Message::ShutdownOK, "Expected Opus shutdown code {}, got {}", Message::ShutdownOK, msg);
+    ASSERT_MSG(msg == Message::ShutdownOK, "Expected Opus shutdown code {}, got {}",
+               Message::ShutdownOK, msg);
     main_thread.request_stop();
     main_thread.join();
     running = false;
-
-    // Must shutdown as there are AV allocations which are manual
-    for (auto& e : decode_objects)
-        e.second.Shutdown();
-    for (auto& e : ms_decode_objects)
-        e.second.Shutdown();
 }
 
 void OpusDecoder::Send(Direction dir, u32 message) {
@@ -72,195 +68,202 @@ void OpusDecoder::Init(std::stop_token stop_token) {
     Common::SetCurrentThreadName("DSP_OpusDecoder_Init");
 
     if (Receive(Direction::DSP, stop_token) != Message::Start) {
-        LOG_ERROR(Service_Audio, "DSP OpusDecoder failed to receive Start message. Opus initialization failed.");
+        LOG_ERROR(Service_Audio,
+                  "DSP OpusDecoder failed to receive Start message. Opus initialization failed.");
         return;
     }
-    // Main OpusDecoder thread, responsible for processing the incoming Opus packets.
-    main_thread = std::jthread([this](std::stop_token thread_stop_token) {
-        Common::SetCurrentThreadName("DSP_OpusDecoder_Main");
-        while (!thread_stop_token.stop_requested()) {
-            auto msg = Receive(Direction::DSP, thread_stop_token);
-            switch (msg) {
-            case Shutdown:
-                Send(Direction::Host, Message::ShutdownOK);
-                return;
-            case GetWorkBufferSize: {
-                auto channel_count = s32(shared_memory->host_send_data[0]);
-
-                ASSERT(IsValidChannelCount(channel_count));
-
-                shared_memory->dsp_return_data[0] = OpusDecodeObject::GetWorkBufferSize(channel_count);
-                Send(Direction::Host, Message::GetWorkBufferSizeOK);
-                break;
-            }
-            case InitializeDecodeObject: {
-                auto buffer = shared_memory->host_send_data[0];
-                auto buffer_size = shared_memory->host_send_data[1];
-                auto sample_rate = s32(shared_memory->host_send_data[2]);
-                auto channel_count = s32(shared_memory->host_send_data[3]);
-
-                ASSERT(sample_rate >= 0);
-                ASSERT(IsValidChannelCount(channel_count));
-                ASSERT(buffer_size >= OpusDecodeObject::GetWorkBufferSize(channel_count));
-
-                if (auto const it = decode_objects.find(buffer); it != decode_objects.end()) {
-                    it->second.Shutdown();
-                    shared_memory->dsp_return_data[0] = it->second.InitializeDecoder(sample_rate, channel_count).raw;
-                } else {
-                    OpusDecodeObject obj{};
-                    shared_memory->dsp_return_data[0] = obj.InitializeDecoder(sample_rate, channel_count).raw;
-                    decode_objects.insert_or_assign(buffer, obj);
-                }
-                Send(Direction::Host, Message::InitializeDecodeObjectOK);
-                break;
-            }
-            case ShutdownDecodeObject: {
-                auto buffer = shared_memory->host_send_data[0];
-                //[[maybe_unused]] auto buffer_size = shared_memory->host_send_data[1];
-                if (auto const it = decode_objects.find(buffer); it != decode_objects.end()) {
-                    shared_memory->dsp_return_data[0] = it->second.Shutdown().raw;
-                } else {
-                    LOG_ERROR(Audio_DSP, "operating unregistered buffer {}", buffer);
-                    shared_memory->dsp_return_data[0] = Service::Audio::ResultLibOpusInvalidState.raw;
-                }
-                Send(Direction::Host, Message::ShutdownDecodeObjectOK);
-                break;
-            }
-            case DecodeInterleaved: {
-                auto start_time = system.CoreTiming().GetGlobalTimeUs();
-
-                auto buffer = shared_memory->host_send_data[0];
-                auto input_data = shared_memory->host_send_data[1];
-                auto input_data_size = shared_memory->host_send_data[2];
-                auto output_data = shared_memory->host_send_data[3];
-                auto output_data_size = shared_memory->host_send_data[4];
-                //auto final_range = static_cast<u32>(shared_memory->host_send_data[5]);
-                auto reset_requested = shared_memory->host_send_data[6];
-
-                u32 decoded_samples{0};
-
-                if (auto const it = decode_objects.find(buffer); it != decode_objects.end()) {
-                    auto res = ResultSuccess;
-                    if (reset_requested)
-                        res = it->second.ResetDecoder();
-                    if (res == ResultSuccess)
-                        res = it->second.Decode(decoded_samples, output_data, output_data_size, input_data, input_data_size);
-
-                    auto end_time = system.CoreTiming().GetGlobalTimeUs();
-                    shared_memory->dsp_return_data[0] = res.raw;
-                    shared_memory->dsp_return_data[1] = decoded_samples;
-                    shared_memory->dsp_return_data[2] = (end_time - start_time).count();
-                } else {
-                    LOG_ERROR(Audio_DSP, "operating unregistered buffer {}", buffer);
-                    shared_memory->dsp_return_data[0] = Service::Audio::ResultLibOpusInvalidState.raw;
-                }
-                Send(Direction::Host, Message::DecodeInterleavedOK);
-                break;
-            }
-            case MapMemory: {
-                [[maybe_unused]] auto buffer = shared_memory->host_send_data[0];
-                [[maybe_unused]] auto buffer_size = shared_memory->host_send_data[1];
-                Send(Direction::Host, Message::MapMemoryOK);
-                break;
-            }
-            case UnmapMemory: {
-                [[maybe_unused]] auto buffer = shared_memory->host_send_data[0];
-                [[maybe_unused]] auto buffer_size = shared_memory->host_send_data[1];
-                Send(Direction::Host, Message::UnmapMemoryOK);
-                break;
-            }
-            case GetWorkBufferSizeForMultiStream: {
-                auto total_stream_count = s32(shared_memory->host_send_data[0]);
-                auto stereo_stream_count = s32(shared_memory->host_send_data[1]);
-
-                ASSERT(IsValidMultiStreamStreamCounts(total_stream_count, stereo_stream_count));
-
-                shared_memory->dsp_return_data[0] = OpusMultiStreamDecodeObject::GetWorkBufferSize(
-                    total_stream_count, stereo_stream_count);
-                Send(Direction::Host, Message::GetWorkBufferSizeForMultiStreamOK);
-                break;
-            }
-            case InitializeMultiStreamDecodeObject: {
-                auto buffer = shared_memory->host_send_data[0];
-                auto buffer_size = shared_memory->host_send_data[1];
-                auto sample_rate = s32(shared_memory->host_send_data[2]);
-                auto channel_count = s32(shared_memory->host_send_data[3]);
-                auto total_stream_count = s32(shared_memory->host_send_data[4]);
-                auto stereo_stream_count = s32(shared_memory->host_send_data[5]);
-                // Nintendo seem to have a bug here, they try to use &host_send_data[6] for the channel
-                // mappings, but [6] is never set, and there is not enough room in the argument data for
-                // more than 40 channels, when 255 are possible.
-                // It also means the mapping values are undefined, though likely always 0,
-                // and the mappings given by the game are ignored. The mappings are copied to this
-                // dedicated buffer host side, so let's do as intended.
-                auto mappings = shared_memory->channel_mapping.data();
-
-                ASSERT(IsValidMultiStreamStreamCounts(total_stream_count, stereo_stream_count));
-                ASSERT(sample_rate >= 0);
-                ASSERT(buffer_size >= OpusMultiStreamDecodeObject::GetWorkBufferSize(total_stream_count, stereo_stream_count));
-
-                if (auto const it = ms_decode_objects.find(buffer); it != ms_decode_objects.end()) {
-                    it->second.Shutdown();
-                    shared_memory->dsp_return_data[0] = it->second.InitializeDecoder(sample_rate, total_stream_count, channel_count, stereo_stream_count, mappings).raw;
-                } else {
-                    OpusMultiStreamDecodeObject obj{};
-                    shared_memory->dsp_return_data[0] = obj.InitializeDecoder(sample_rate, total_stream_count, channel_count, stereo_stream_count, mappings).raw;
-                    ms_decode_objects.insert_or_assign(buffer, obj);
-                }
-                Send(Direction::Host, Message::InitializeMultiStreamDecodeObjectOK);
-                break;
-            }
-            case ShutdownMultiStreamDecodeObject: {
-                auto buffer = shared_memory->host_send_data[0];
-                //[[maybe_unused]] auto buffer_size = shared_memory->host_send_data[1];
-                if (auto const it = ms_decode_objects.find(buffer); it != ms_decode_objects.end()) {
-                    shared_memory->dsp_return_data[0] = it->second.Shutdown().raw;
-                } else {
-                    LOG_ERROR(Audio_DSP, "operating unregistered buffer {}", buffer);
-                    shared_memory->dsp_return_data[0] = Service::Audio::ResultLibOpusInvalidState.raw;
-                }
-                Send(Direction::Host, Message::ShutdownMultiStreamDecodeObjectOK);
-                break;
-            }
-            case DecodeInterleavedForMultiStream: {
-                auto start_time = system.CoreTiming().GetGlobalTimeUs();
-
-                auto buffer = shared_memory->host_send_data[0];
-                auto input_data = shared_memory->host_send_data[1];
-                auto input_data_size = shared_memory->host_send_data[2];
-                auto output_data = shared_memory->host_send_data[3];
-                auto output_data_size = shared_memory->host_send_data[4];
-                //auto final_range = static_cast<u32>(shared_memory->host_send_data[5]);
-                auto reset_requested = shared_memory->host_send_data[6];
-
-                u32 decoded_samples{0};
-
-                if (auto const it = ms_decode_objects.find(buffer); it != ms_decode_objects.end()) {
-                    auto res = ResultSuccess;
-                    if (reset_requested)
-                        res = it->second.ResetDecoder();
-                    if (res == ResultSuccess)
-                        res = it->second.Decode(decoded_samples, output_data, output_data_size, input_data, input_data_size);
-
-                    auto end_time = system.CoreTiming().GetGlobalTimeUs();
-                    shared_memory->dsp_return_data[0] = res.raw;
-                    shared_memory->dsp_return_data[1] = decoded_samples;
-                    shared_memory->dsp_return_data[2] = (end_time - start_time).count();
-                } else {
-                    LOG_ERROR(Audio_DSP, "operating unregistered buffer {}", buffer);
-                    shared_memory->dsp_return_data[0] = Service::Audio::ResultLibOpusInvalidState.raw;
-                }
-                Send(Direction::Host, Message::DecodeInterleavedForMultiStreamOK);
-                break;
-            }
-            default:
-                LOG_ERROR(Audio_DSP, "Invalid OpusDecoder command {}", msg);
-                continue;
-            }
-        }
-    });
+    main_thread = std::jthread([this](std::stop_token st) { Main(st); });
     running = true;
     Send(Direction::Host, Message::StartOK);
 }
 
+void OpusDecoder::Main(std::stop_token stop_token) {
+    Common::SetCurrentThreadName("DSP_OpusDecoder_Main");
+
+    while (!stop_token.stop_requested()) {
+        auto msg = Receive(Direction::DSP, stop_token);
+        switch (msg) {
+        case Shutdown:
+            Send(Direction::Host, Message::ShutdownOK);
+            return;
+
+        case GetWorkBufferSize: {
+            auto channel_count = static_cast<s32>(shared_memory->host_send_data[0]);
+
+            ASSERT(IsValidChannelCount(channel_count));
+
+            shared_memory->dsp_return_data[0] = OpusDecodeObject::GetWorkBufferSize(channel_count);
+            Send(Direction::Host, Message::GetWorkBufferSizeOK);
+        } break;
+
+        case InitializeDecodeObject: {
+            auto buffer = shared_memory->host_send_data[0];
+            auto buffer_size = shared_memory->host_send_data[1];
+            auto sample_rate = static_cast<s32>(shared_memory->host_send_data[2]);
+            auto channel_count = static_cast<s32>(shared_memory->host_send_data[3]);
+
+            ASSERT(sample_rate >= 0);
+            ASSERT(IsValidChannelCount(channel_count));
+            ASSERT(buffer_size >= OpusDecodeObject::GetWorkBufferSize(channel_count));
+
+            auto& decoder_object = OpusDecodeObject::Initialize(buffer, buffer);
+            shared_memory->dsp_return_data[0] =
+                decoder_object.InitializeDecoder(sample_rate, channel_count);
+
+            Send(Direction::Host, Message::InitializeDecodeObjectOK);
+        } break;
+
+        case ShutdownDecodeObject: {
+            auto buffer = shared_memory->host_send_data[0];
+            [[maybe_unused]] auto buffer_size = shared_memory->host_send_data[1];
+
+            auto& decoder_object = OpusDecodeObject::Initialize(buffer, buffer);
+            shared_memory->dsp_return_data[0] = decoder_object.Shutdown();
+
+            Send(Direction::Host, Message::ShutdownDecodeObjectOK);
+        } break;
+
+        case DecodeInterleaved: {
+            auto start_time = system.CoreTiming().GetGlobalTimeUs();
+
+            auto buffer = shared_memory->host_send_data[0];
+            auto input_data = shared_memory->host_send_data[1];
+            auto input_data_size = shared_memory->host_send_data[2];
+            auto output_data = shared_memory->host_send_data[3];
+            auto output_data_size = shared_memory->host_send_data[4];
+            auto final_range = static_cast<u32>(shared_memory->host_send_data[5]);
+            auto reset_requested = shared_memory->host_send_data[6];
+
+            u32 decoded_samples{0};
+
+            auto& decoder_object = OpusDecodeObject::Initialize(buffer, buffer);
+            s32 error_code{OPUS_OK};
+            if (reset_requested) {
+                error_code = decoder_object.ResetDecoder();
+            }
+
+            if (error_code == OPUS_OK) {
+                error_code = decoder_object.Decode(decoded_samples, output_data, output_data_size,
+                                                   input_data, input_data_size);
+            }
+
+            if (error_code == OPUS_OK) {
+                if (final_range && decoder_object.GetFinalRange() != final_range) {
+                    error_code = OPUS_INVALID_PACKET;
+                }
+            }
+
+            auto end_time = system.CoreTiming().GetGlobalTimeUs();
+            shared_memory->dsp_return_data[0] = error_code;
+            shared_memory->dsp_return_data[1] = decoded_samples;
+            shared_memory->dsp_return_data[2] = (end_time - start_time).count();
+
+            Send(Direction::Host, Message::DecodeInterleavedOK);
+        } break;
+
+        case MapMemory: {
+            [[maybe_unused]] auto buffer = shared_memory->host_send_data[0];
+            [[maybe_unused]] auto buffer_size = shared_memory->host_send_data[1];
+            Send(Direction::Host, Message::MapMemoryOK);
+        } break;
+
+        case UnmapMemory: {
+            [[maybe_unused]] auto buffer = shared_memory->host_send_data[0];
+            [[maybe_unused]] auto buffer_size = shared_memory->host_send_data[1];
+            Send(Direction::Host, Message::UnmapMemoryOK);
+        } break;
+
+        case GetWorkBufferSizeForMultiStream: {
+            auto total_stream_count = static_cast<s32>(shared_memory->host_send_data[0]);
+            auto stereo_stream_count = static_cast<s32>(shared_memory->host_send_data[1]);
+
+            ASSERT(IsValidMultiStreamStreamCounts(total_stream_count, stereo_stream_count));
+
+            shared_memory->dsp_return_data[0] = OpusMultiStreamDecodeObject::GetWorkBufferSize(
+                total_stream_count, stereo_stream_count);
+            Send(Direction::Host, Message::GetWorkBufferSizeForMultiStreamOK);
+        } break;
+
+        case InitializeMultiStreamDecodeObject: {
+            auto buffer = shared_memory->host_send_data[0];
+            auto buffer_size = shared_memory->host_send_data[1];
+            auto sample_rate = static_cast<s32>(shared_memory->host_send_data[2]);
+            auto channel_count = static_cast<s32>(shared_memory->host_send_data[3]);
+            auto total_stream_count = static_cast<s32>(shared_memory->host_send_data[4]);
+            auto stereo_stream_count = static_cast<s32>(shared_memory->host_send_data[5]);
+            // Nintendo seem to have a bug here, they try to use &host_send_data[6] for the channel
+            // mappings, but [6] is never set, and there is not enough room in the argument data for
+            // more than 40 channels, when 255 are possible.
+            // It also means the mapping values are undefined, though likely always 0,
+            // and the mappings given by the game are ignored. The mappings are copied to this
+            // dedicated buffer host side, so let's do as intended.
+            auto mappings = shared_memory->channel_mapping.data();
+
+            ASSERT(IsValidMultiStreamStreamCounts(total_stream_count, stereo_stream_count));
+            ASSERT(sample_rate >= 0);
+            ASSERT(buffer_size >= OpusMultiStreamDecodeObject::GetWorkBufferSize(
+                                      total_stream_count, stereo_stream_count));
+
+            auto& decoder_object = OpusMultiStreamDecodeObject::Initialize(buffer, buffer);
+            shared_memory->dsp_return_data[0] = decoder_object.InitializeDecoder(
+                sample_rate, total_stream_count, channel_count, stereo_stream_count, mappings);
+
+            Send(Direction::Host, Message::InitializeMultiStreamDecodeObjectOK);
+        } break;
+
+        case ShutdownMultiStreamDecodeObject: {
+            auto buffer = shared_memory->host_send_data[0];
+            [[maybe_unused]] auto buffer_size = shared_memory->host_send_data[1];
+
+            auto& decoder_object = OpusMultiStreamDecodeObject::Initialize(buffer, buffer);
+            shared_memory->dsp_return_data[0] = decoder_object.Shutdown();
+
+            Send(Direction::Host, Message::ShutdownMultiStreamDecodeObjectOK);
+        } break;
+
+        case DecodeInterleavedForMultiStream: {
+            auto start_time = system.CoreTiming().GetGlobalTimeUs();
+
+            auto buffer = shared_memory->host_send_data[0];
+            auto input_data = shared_memory->host_send_data[1];
+            auto input_data_size = shared_memory->host_send_data[2];
+            auto output_data = shared_memory->host_send_data[3];
+            auto output_data_size = shared_memory->host_send_data[4];
+            auto final_range = static_cast<u32>(shared_memory->host_send_data[5]);
+            auto reset_requested = shared_memory->host_send_data[6];
+
+            u32 decoded_samples{0};
+
+            auto& decoder_object = OpusMultiStreamDecodeObject::Initialize(buffer, buffer);
+            s32 error_code{OPUS_OK};
+            if (reset_requested) {
+                error_code = decoder_object.ResetDecoder();
+            }
+
+            if (error_code == OPUS_OK) {
+                error_code = decoder_object.Decode(decoded_samples, output_data, output_data_size,
+                                                   input_data, input_data_size);
+            }
+
+            if (error_code == OPUS_OK) {
+                if (final_range && decoder_object.GetFinalRange() != final_range) {
+                    error_code = OPUS_INVALID_PACKET;
+                }
+            }
+
+            auto end_time = system.CoreTiming().GetGlobalTimeUs();
+            shared_memory->dsp_return_data[0] = error_code;
+            shared_memory->dsp_return_data[1] = decoded_samples;
+            shared_memory->dsp_return_data[2] = (end_time - start_time).count();
+
+            Send(Direction::Host, Message::DecodeInterleavedForMultiStreamOK);
+        } break;
+
+        default:
+            LOG_ERROR(Service_Audio, "Invalid OpusDecoder command {}", msg);
+            continue;
+        }
+    }
+}
+
 } // namespace AudioCore::ADSP::OpusDecoder

src/audio_core/adsp/apps/opus/opus_decoder.h

@@ -6,11 +6,9 @@
 
 #pragma once
 
+#include <memory>
 #include <thread>
 
-#include "common/container/unordered_map.h"
-#include "audio_core/adsp/apps/opus/opus_decode_object.h"
-#include "audio_core/adsp/apps/opus/opus_multistream_decode_object.h"
 #include "audio_core/adsp/apps/opus/shared_memory.h"
 #include "audio_core/adsp/mailbox.h"
 #include "common/common_types.h"
@@ -70,30 +68,28 @@ public:
     }
 
 private:
-    /// @brief Initializing thread, launched at audio_core boot to avoid blocking the main emu boot thread.
+    /**
+     * Initializing thread, launched at audio_core boot to avoid blocking the main emu boot thread.
+     */
     void Init(std::stop_token stop_token);
     /**
      * Main OpusDecoder thread, responsible for processing the incoming Opus packets.
      */
     void Main(std::stop_token stop_token);
 
-    /// Mailbox to communicate messages with the host, drives the main thread
-    Mailbox mailbox;
     /// Core system
     Core::System& system;
-    /// Structure shared with the host, input data set by the host before sending a mailbox message,
-    /// and the responses are written back by the OpusDecoder.
-    SharedMemory* shared_memory{};
+    /// Mailbox to communicate messages with the host, drives the main thread
+    Mailbox mailbox;
     /// Init thread
     std::jthread init_thread{};
     /// Main thread
     std::jthread main_thread{};
-
-    ::Common::unordered_map<u64, OpusDecodeObject> decode_objects;
-    ::Common::unordered_map<u64, OpusMultiStreamDecodeObject> ms_decode_objects;
-
     /// The current state
     bool running{};
+    /// Structure shared with the host, input data set by the host before sending a mailbox message,
+    /// and the responses are written back by the OpusDecoder.
+    SharedMemory* shared_memory{};
 };
 
 } // namespace AudioCore::ADSP::OpusDecoder

src/audio_core/adsp/apps/opus/opus_multistream_decode_object.cpp

@@ -4,17 +4,8 @@
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-extern "C" {
-#include <libavcodec/avcodec.h>
-#include <libavcodec/codec.h>
-#include <libavcodec/packet.h>
-#include <libavutil/channel_layout.h>
-#include <libavutil/frame.h>
-}
-
 #include "audio_core/adsp/apps/opus/opus_multistream_decode_object.h"
-#include "core/hle/result.h"
-#include "core/hle/service/audio/errors.h"
+#include "common/assert.h"
 
 namespace AudioCore::ADSP::OpusDecoder {
 
@@ -22,61 +13,101 @@ namespace {
 constexpr u32 OpusStreamCountMax = 255;
 
 bool IsValidStreamCounts(u32 total_stream_count, u32 stereo_stream_count) {
-    return total_stream_count > 0 && total_stream_count <= OpusStreamCountMax
-        && s32(stereo_stream_count) >= 0 && stereo_stream_count <= total_stream_count;
+    return total_stream_count > 0 && total_stream_count <= OpusStreamCountMax &&
+           static_cast<s32>(stereo_stream_count) >= 0 &&
+           stereo_stream_count <= total_stream_count;
 }
 } // namespace
 
-u32 OpusMultiStreamDecodeObject::GetWorkBufferSize(u32 total_stream_count, u32 stereo_stream_count) {
-    if (IsValidStreamCounts(total_stream_count, stereo_stream_count))
-        return u32(sizeof(OpusMultiStreamDecodeObject)) + 2556 * (total_stream_count * stereo_stream_count);
+u32 OpusMultiStreamDecodeObject::GetWorkBufferSize(u32 total_stream_count,
+                                                   u32 stereo_stream_count) {
+    if (IsValidStreamCounts(total_stream_count, stereo_stream_count)) {
+        return static_cast<u32>(sizeof(OpusMultiStreamDecodeObject)) +
+               opus_multistream_decoder_get_size(total_stream_count, stereo_stream_count);
+    }
     return 0;
 }
 
-Result OpusMultiStreamDecodeObject::InitializeDecoder(u32 sample_rate, u32 total_stream_count, u32 channel_count, u32 stereo_stream_count, u8* mappings) {
-    if ((codec = avcodec_find_decoder(AV_CODEC_ID_OPUS)) == nullptr)
-        return Service::Audio::ResultLibOpusInvalidState;
-    if ((avctx = avcodec_alloc_context3(codec)) == nullptr)
-        return Service::Audio::ResultLibOpusInvalidState;
-    avctx->sample_rate = sample_rate;
-    av_channel_layout_default(&avctx->ch_layout, channel_count);
-    return ResultSuccess;
-}
+OpusMultiStreamDecodeObject& OpusMultiStreamDecodeObject::Initialize(u64 buffer, u64 buffer2) {
+    auto* new_decoder = reinterpret_cast<OpusMultiStreamDecodeObject*>(buffer);
+    auto* comparison = reinterpret_cast<OpusMultiStreamDecodeObject*>(buffer2);
 
-Result OpusMultiStreamDecodeObject::Shutdown() {
-    if (avctx) {
-        avcodec_free_context(&avctx);
-        avctx = nullptr;
+    if (new_decoder->magic == DecodeMultiStreamObjectMagic) {
+        if (!new_decoder->initialized ||
+            (new_decoder->initialized && new_decoder->self == comparison)) {
+            new_decoder->state_valid = true;
+        }
+    } else {
+        new_decoder->initialized = false;
+        new_decoder->state_valid = true;
     }
-    return ResultSuccess;
+    return *new_decoder;
 }
 
-Result OpusMultiStreamDecodeObject::ResetDecoder() {
-    if (avctx) {
-        avcodec_flush_buffers(avctx);
-        return ResultSuccess;
+s32 OpusMultiStreamDecodeObject::InitializeDecoder(u32 sample_rate, u32 total_stream_count,
+                                                   u32 channel_count, u32 stereo_stream_count,
+                                                   u8* mappings) {
+    if (!state_valid) {
+        return OPUS_INVALID_STATE;
     }
-    return Service::Audio::ResultLibOpusInvalidState;
+
+    if (initialized) {
+        return OPUS_OK;
+    }
+
+    // See OpusDecodeObject::InitializeDecoder for an explanation of this
+    decoder = (LibOpusMSDecoder*)(this + 1);
+    s32 ret = opus_multistream_decoder_init(decoder, sample_rate, channel_count, total_stream_count,
+                                            stereo_stream_count, mappings);
+    if (ret == OPUS_OK) {
+        magic = DecodeMultiStreamObjectMagic;
+        initialized = true;
+        state_valid = true;
+        self = this;
+        final_range = 0;
+    }
+    return ret;
 }
 
-Result OpusMultiStreamDecodeObject::Decode(u32& out_sample_count, u64 output_data, u64 output_data_size, u64 input_data, u64 input_data_size) {
+s32 OpusMultiStreamDecodeObject::Shutdown() {
+    if (!state_valid) {
+        return OPUS_INVALID_STATE;
+    }
+
+    if (initialized) {
+        magic = 0x0;
+        initialized = false;
+        state_valid = false;
+        self = nullptr;
+        final_range = 0;
+        decoder = nullptr;
+    }
+    return OPUS_OK;
+}
+
+s32 OpusMultiStreamDecodeObject::ResetDecoder() {
+    return opus_multistream_decoder_ctl(decoder, OPUS_RESET_STATE);
+}
+
+s32 OpusMultiStreamDecodeObject::Decode(u32& out_sample_count, u64 output_data,
+                                        u64 output_data_size, u64 input_data, u64 input_data_size) {
+    ASSERT(initialized);
     out_sample_count = 0;
-    if (avctx) {
-        AVPacket* avpkt = av_packet_alloc();
-        av_new_packet(avpkt, int(input_data_size));
-        std::memcpy(avpkt->data, reinterpret_cast<const u8*>(input_data), input_data_size);
-        avcodec_send_packet(avctx, avpkt);
 
-        AVFrame* frame = av_frame_alloc();
-        avcodec_receive_frame(avctx, frame);
-        std::memcpy(reinterpret_cast<u16*>(output_data), frame->data, output_data_size);
-        av_frame_free(&frame);
-        av_packet_free(&avpkt);
-
-        out_sample_count = frame->nb_samples;
-        return ResultSuccess;
+    if (!state_valid) {
+        return OPUS_INVALID_STATE;
     }
-    return Service::Audio::ResultLibOpusInvalidState;
+
+    auto ret_code_or_samples = opus_multistream_decode(
+        decoder, reinterpret_cast<const u8*>(input_data), static_cast<opus_int32>(input_data_size),
+        reinterpret_cast<opus_int16*>(output_data), static_cast<opus_int32>(output_data_size), 0);
+
+    if (ret_code_or_samples < OPUS_OK) {
+        return ret_code_or_samples;
+    }
+
+    out_sample_count = ret_code_or_samples;
+    return opus_multistream_decoder_ctl(decoder, OPUS_GET_FINAL_RANGE_REQUEST, &final_range);
 }
 
 } // namespace AudioCore::ADSP::OpusDecoder

src/audio_core/adsp/apps/opus/opus_multistream_decode_object.h

@@ -1,30 +1,39 @@
-// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
-// SPDX-License-Identifier: GPL-3.0-or-later
-
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #pragma once
 
-#include "common/common_types.h"
-#include "core/hle/result.h"
+#include <opus_multistream.h>
 
-struct AVCodec;
-struct AVCodecContext;
+#include "common/common_types.h"
 
 namespace AudioCore::ADSP::OpusDecoder {
+using LibOpusMSDecoder = ::OpusMSDecoder;
+static constexpr u32 DecodeMultiStreamObjectMagic = 0xDEADBEEF;
 
 class OpusMultiStreamDecodeObject {
 public:
     static u32 GetWorkBufferSize(u32 total_stream_count, u32 stereo_stream_count);
+    static OpusMultiStreamDecodeObject& Initialize(u64 buffer, u64 buffer2);
 
-    Result InitializeDecoder(u32 sample_rate, u32 total_stream_count, u32 channel_count, u32 stereo_stream_count, u8* mappings);
-    Result Shutdown();
-    Result ResetDecoder();
-    Result Decode(u32& out_sample_count, u64 output_data, u64 output_data_size, u64 input_data, u64 input_data_size);
+    s32 InitializeDecoder(u32 sample_rate, u32 total_stream_count, u32 channel_count,
+                          u32 stereo_stream_count, u8* mappings);
+    s32 Shutdown();
+    s32 ResetDecoder();
+    s32 Decode(u32& out_sample_count, u64 output_data, u64 output_data_size, u64 input_data,
+               u64 input_data_size);
+    u32 GetFinalRange() const noexcept {
+        return final_range;
+    }
 
-    AVCodec const* codec = nullptr;
-    AVCodecContext* avctx = nullptr;
+private:
+    u32 magic;
+    bool initialized;
+    bool state_valid;
+    OpusMultiStreamDecodeObject* self;
+    u32 final_range;
+    LibOpusMSDecoder* decoder;
 };
+static_assert(std::is_trivially_constructible_v<OpusMultiStreamDecodeObject>);
 
 } // namespace AudioCore::ADSP::OpusDecoder

src/audio_core/adsp/apps/opus/opus_types.h

@@ -1,32 +0,0 @@
-// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
-// SPDX-License-Identifier: GPL-3.0-or-later
-
-#pragma once
-
-#include "common/common_types.h"
-
-namespace AudioCore::ADSP {
-
-static constexpr u32 DECODE_OBJECT_MAGIC = 0xDEADBEEF;
-struct LibOpusDecoder {
-    u32 magic;
-    bool initialized;
-    bool state_valid;
-    LibOpusDecoder* self;
-    u32 final_range;
-    void* decoder;
-};
-static_assert(sizeof(LibOpusDecoder) == 32);
-
-static constexpr u32 DECODE_MULTISTREAM_OBJECT_MAGIC = 0xDEADBEEF;
-struct LibOpusMultistreamDecoder {
-    u32 magic;
-    bool initialized;
-    bool state_valid;
-    LibOpusMultistreamDecoder* self;
-    u32 final_range;
-    void* decoder;
-};
-static_assert(sizeof(LibOpusMultistreamDecoder) == 32);
-
-}

src/audio_core/adsp/apps/opus/shared_memory.h

@@ -1,11 +1,9 @@
-// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
-// SPDX-License-Identifier: GPL-3.0-or-later
-
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #pragma once
 
+#include "common/common_funcs.h"
 #include "common/common_types.h"
 
 namespace AudioCore::ADSP::OpusDecoder {

src/audio_core/opus/hardware_opus.cpp

@@ -9,18 +9,39 @@
 #include "audio_core/audio_core.h"
 #include "audio_core/opus/hardware_opus.h"
 #include "core/core.h"
-#include "core/hle/result.h"
 
 namespace AudioCore::OpusDecoder {
-
 namespace {
 using namespace Service::Audio;
+
+static constexpr Result ResultCodeFromLibOpusErrorCode(u64 error_code) {
+    s32 error{static_cast<s32>(error_code)};
+    ASSERT(error <= OPUS_OK);
+    switch (error) {
+    case OPUS_ALLOC_FAIL:
+        R_THROW(ResultLibOpusAllocFail);
+    case OPUS_INVALID_STATE:
+        R_THROW(ResultLibOpusInvalidState);
+    case OPUS_UNIMPLEMENTED:
+        R_THROW(ResultLibOpusUnimplemented);
+    case OPUS_INVALID_PACKET:
+        R_THROW(ResultLibOpusInvalidPacket);
+    case OPUS_INTERNAL_ERROR:
+        R_THROW(ResultLibOpusInternalError);
+    case OPUS_BUFFER_TOO_SMALL:
+        R_THROW(ResultBufferTooSmall);
+    case OPUS_BAD_ARG:
+        R_THROW(ResultLibOpusBadArg);
+    case OPUS_OK:
+        R_RETURN(ResultSuccess);
+    }
+    UNREACHABLE();
+}
+
 } // namespace
 
 HardwareOpus::HardwareOpus(Core::System& system_)
-    : system{system_}
-    , opus_decoder{system.AudioCore().ADSP().OpusDecoder()}
-{
+    : system{system_}, opus_decoder{system.AudioCore().ADSP().OpusDecoder()} {
     opus_decoder.SetSharedMemory(shared_memory);
 }
 
@@ -71,7 +92,7 @@ Result HardwareOpus::InitializeDecodeObject(u32 sample_rate, u32 channel_count,
         R_THROW(ResultInvalidOpusDSPReturnCode);
     }
 
-    R_RETURN(Result(u32(shared_memory.dsp_return_data[0])));
+    R_RETURN(ResultCodeFromLibOpusErrorCode(shared_memory.dsp_return_data[0]));
 }
 
 Result HardwareOpus::InitializeMultiStreamDecodeObject(u32 sample_rate, u32 channel_count,
@@ -99,7 +120,7 @@ Result HardwareOpus::InitializeMultiStreamDecodeObject(u32 sample_rate, u32 chan
         R_THROW(ResultInvalidOpusDSPReturnCode);
     }
 
-    R_RETURN(Result(u32(shared_memory.dsp_return_data[0])));
+    R_RETURN(ResultCodeFromLibOpusErrorCode(shared_memory.dsp_return_data[0]));
 }
 
 Result HardwareOpus::ShutdownDecodeObject(void* buffer, u64 buffer_size) {
@@ -113,7 +134,7 @@ Result HardwareOpus::ShutdownDecodeObject(void* buffer, u64 buffer_size) {
                "Expected Opus shutdown code {}, got {}",
                ADSP::OpusDecoder::Message::ShutdownDecodeObjectOK, msg);
 
-    R_RETURN(Result(u32(shared_memory.dsp_return_data[0])));
+    R_RETURN(ResultCodeFromLibOpusErrorCode(shared_memory.dsp_return_data[0]));
 }
 
 Result HardwareOpus::ShutdownMultiStreamDecodeObject(void* buffer, u64 buffer_size) {
@@ -128,7 +149,7 @@ Result HardwareOpus::ShutdownMultiStreamDecodeObject(void* buffer, u64 buffer_si
                "Expected Opus shutdown code {}, got {}",
                ADSP::OpusDecoder::Message::ShutdownMultiStreamDecodeObjectOK, msg);
 
-    R_RETURN(Result(u32(shared_memory.dsp_return_data[0])));
+    R_RETURN(ResultCodeFromLibOpusErrorCode(shared_memory.dsp_return_data[0]));
 }
 
 Result HardwareOpus::DecodeInterleaved(u32& out_sample_count, void* output_data,
@@ -152,12 +173,12 @@ Result HardwareOpus::DecodeInterleaved(u32& out_sample_count, void* output_data,
         R_THROW(ResultInvalidOpusDSPReturnCode);
     }
 
-    auto error_code = s32(shared_memory.dsp_return_data[0]);
-    if (error_code == ResultSuccess.raw) {
-        out_sample_count = u32(shared_memory.dsp_return_data[1]);
+    auto error_code{static_cast<s32>(shared_memory.dsp_return_data[0])};
+    if (error_code == OPUS_OK) {
+        out_sample_count = static_cast<u32>(shared_memory.dsp_return_data[1]);
         out_time_taken = 1000 * shared_memory.dsp_return_data[2];
     }
-    R_RETURN(Result(u32(error_code)));
+    R_RETURN(ResultCodeFromLibOpusErrorCode(error_code));
 }
 
 Result HardwareOpus::DecodeInterleavedForMultiStream(u32& out_sample_count, void* output_data,
@@ -166,27 +187,29 @@ Result HardwareOpus::DecodeInterleavedForMultiStream(u32& out_sample_count, void
                                                      void* buffer, u64& out_time_taken,
                                                      bool reset) {
     std::scoped_lock l{mutex};
-    shared_memory.host_send_data[0] = u64(buffer);
-    shared_memory.host_send_data[1] = u64(input_data);
+    shared_memory.host_send_data[0] = (u64)buffer;
+    shared_memory.host_send_data[1] = (u64)input_data;
     shared_memory.host_send_data[2] = input_data_size;
-    shared_memory.host_send_data[3] = u64(output_data);
+    shared_memory.host_send_data[3] = (u64)output_data;
     shared_memory.host_send_data[4] = output_data_size;
     shared_memory.host_send_data[5] = 0;
     shared_memory.host_send_data[6] = reset;
 
-    opus_decoder.Send(ADSP::Direction::DSP, ADSP::OpusDecoder::Message::DecodeInterleavedForMultiStream);
+    opus_decoder.Send(ADSP::Direction::DSP,
+                      ADSP::OpusDecoder::Message::DecodeInterleavedForMultiStream);
     auto msg = opus_decoder.Receive(ADSP::Direction::Host);
     if (msg != ADSP::OpusDecoder::Message::DecodeInterleavedForMultiStreamOK) {
-        LOG_ERROR(Service_Audio, "OpusDecoder returned invalid message. Expected {} got {}", ADSP::OpusDecoder::Message::DecodeInterleavedForMultiStreamOK, msg);
+        LOG_ERROR(Service_Audio, "OpusDecoder returned invalid message. Expected {} got {}",
+                  ADSP::OpusDecoder::Message::DecodeInterleavedForMultiStreamOK, msg);
         R_THROW(ResultInvalidOpusDSPReturnCode);
     }
 
-    auto const error_code = shared_memory.dsp_return_data[0];
-    if (error_code == ResultSuccess.raw) {
+    auto error_code{static_cast<s32>(shared_memory.dsp_return_data[0])};
+    if (error_code == OPUS_OK) {
         out_sample_count = static_cast<u32>(shared_memory.dsp_return_data[1]);
         out_time_taken = 1000 * shared_memory.dsp_return_data[2];
     }
-    R_RETURN(Result(u32(shared_memory.dsp_return_data[0])));
+    R_RETURN(ResultCodeFromLibOpusErrorCode(error_code));
 }
 
 Result HardwareOpus::MapMemory(void* buffer, u64 buffer_size) {
@@ -197,7 +220,8 @@ Result HardwareOpus::MapMemory(void* buffer, u64 buffer_size) {
     opus_decoder.Send(ADSP::Direction::DSP, ADSP::OpusDecoder::Message::MapMemory);
     auto msg = opus_decoder.Receive(ADSP::Direction::Host);
     if (msg != ADSP::OpusDecoder::Message::MapMemoryOK) {
-        LOG_ERROR(Service_Audio, "OpusDecoder returned invalid message. Expected {} got {}", ADSP::OpusDecoder::Message::MapMemoryOK, msg);
+        LOG_ERROR(Service_Audio, "OpusDecoder returned invalid message. Expected {} got {}",
+                  ADSP::OpusDecoder::Message::MapMemoryOK, msg);
         R_THROW(ResultInvalidOpusDSPReturnCode);
     }
     R_SUCCEED();
@@ -211,7 +235,8 @@ Result HardwareOpus::UnmapMemory(void* buffer, u64 buffer_size) {
     opus_decoder.Send(ADSP::Direction::DSP, ADSP::OpusDecoder::Message::UnmapMemory);
     auto msg = opus_decoder.Receive(ADSP::Direction::Host);
     if (msg != ADSP::OpusDecoder::Message::UnmapMemoryOK) {
-        LOG_ERROR(Service_Audio, "OpusDecoder returned invalid message. Expected {} got {}", ADSP::OpusDecoder::Message::UnmapMemoryOK, msg);
+        LOG_ERROR(Service_Audio, "OpusDecoder returned invalid message. Expected {} got {}",
+                  ADSP::OpusDecoder::Message::UnmapMemoryOK, msg);
         R_THROW(ResultInvalidOpusDSPReturnCode);
     }
     R_SUCCEED();

src/audio_core/opus/hardware_opus.h

@@ -1,12 +1,11 @@
-// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
-// SPDX-License-Identifier: GPL-3.0-or-later
-
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #pragma once
 
 #include <mutex>
+#include <opus.h>
+
 #include "audio_core/adsp/apps/opus/opus_decoder.h"
 #include "audio_core/adsp/apps/opus/shared_memory.h"
 #include "audio_core/adsp/mailbox.h"

src/common/fs/fs_paths.h

@@ -23,6 +23,7 @@
 #define LOSSLESS_DIR "lossless"
 #define NAND_DIR "nand"
 #define PLAY_TIME_DIR "play_time"
+#define POST_SHADER_DIR "post_shaders"
 #define SCREENSHOTS_DIR "screenshots"
 #define SDMC_DIR "sdmc"
 #define SHADER_DIR "shader"

src/common/fs/path_util.cpp

@@ -160,6 +160,7 @@ public:
         GenerateEdenPath(EdenPath::LosslessDir, eden_path / LOSSLESS_DIR);
         GenerateEdenPath(EdenPath::NANDDir, eden_path / NAND_DIR);
         GenerateEdenPath(EdenPath::PlayTimeDir, eden_path / PLAY_TIME_DIR);
+        GenerateEdenPath(EdenPath::PostShaderDir, eden_path / POST_SHADER_DIR);
         GenerateEdenPath(EdenPath::SaveDir, eden_path / NAND_DIR);
         GenerateEdenPath(EdenPath::ScreenshotsDir, eden_path / SCREENSHOTS_DIR);
         GenerateEdenPath(EdenPath::SDMCDir, eden_path / SDMC_DIR);

src/common/fs/path_util.h

@@ -26,6 +26,7 @@ enum class EdenPath {
     LosslessDir,    // Where the user-supplied Lossless Scaling library is stored.
     NANDDir,        // Where the emulated NAND is stored.
     PlayTimeDir,    // Where play time data is stored.
+    PostShaderDir,  // Where user post-processing shaders are stored.
     SaveDir,        // Where save data is stored.
     ScreenshotsDir, // Where yuzu screenshots are stored.
     SDMCDir,        // Where the emulated SDMC is stored.

src/common/settings.h

@@ -388,6 +388,14 @@ struct Values {
                                                   true,
                                                   true};
 
+    SwitchableSetting<std::string> post_shader_chain{linkage,
+                                                     std::string(),
+                                                     "post_shader_chain",
+                                                     Category::Renderer,
+                                                     Specialization::Default,
+                                                     true,
+                                                     true};
+
     SwitchableSetting<bool> frame_gen{linkage, false, "frame_gen", Category::Renderer,
                                       Specialization::Default, true, false};
 

src/core/CMakeLists.txt

@@ -1205,6 +1205,7 @@ else()
     endif()
 endif()
 
+target_include_directories(core PRIVATE ${OPUS_INCLUDE_DIRS})
 target_link_libraries(core PUBLIC common PRIVATE audio_core hid_core network video_core nx_tzdb tz)
 
 if (BOOST_NO_HEADERS)

src/qt_common/config/shared_translation.cpp

@@ -150,6 +150,7 @@ std::unique_ptr<TranslationMap> InitializeTranslations(QObject* parent) {
     INSERT(Settings, anti_aliasing, tr("Anti-Aliasing Method:"),
            tr("The anti-aliasing method to use.\nSMAA offers the best quality.\nFXAA "
               "can produce a more stable picture in lower resolutions."));
+    INSERT(Settings, post_shader_chain, QString(), QString());
     INSERT(Settings, fullscreen_mode, tr("Fullscreen Mode:"),
            tr("The method used to render the window in fullscreen.\nBorderless offers the best "
               "compatibility with the on-screen keyboard that some games request for "

src/video_core/CMakeLists.txt

@@ -299,6 +299,21 @@ if (ENABLE_LSFG)
     target_compile_definitions(video_core PUBLIC HAS_LSFG)
 endif()
 
+if (ENABLE_RESHADE)
+    target_sources(video_core PRIVATE
+        post_processing/fx_chain.cpp
+        post_processing/fx_chain.h
+        post_processing/fx_compile.cpp
+        post_processing/fx_compile.h
+        post_processing/fx_effect.cpp
+        post_processing/fx_effect.h
+        renderer_vulkan/present/post_process.cpp
+        renderer_vulkan/present/post_process.h
+    )
+    target_link_libraries(video_core PRIVATE reshadefx::reshadefx)
+    target_compile_definitions(video_core PUBLIC HAS_RESHADE)
+endif()
+
 if (ENABLE_OPENGL)
     target_sources(video_core PRIVATE
         renderer_opengl/present/filters.cpp
@@ -367,7 +382,9 @@ endif()
 if (YUZU_USE_EXTERNAL_FFMPEG)
     add_dependencies(video_core ffmpeg-build)
 endif()
+
 target_include_directories(video_core PUBLIC ${FFmpeg_INCLUDE_DIR})
+
 target_link_libraries(video_core PRIVATE ${FFmpeg_LIBRARIES})
 target_link_options(video_core PRIVATE ${FFmpeg_LDFLAGS})
 

src/video_core/post_processing/fx_chain.cpp

@@ -0,0 +1,285 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <algorithm>
+#include <cstdlib>
+
+#include <fmt/format.h>
+
+#include "common/settings.h"
+#include "video_core/post_processing/fx_chain.h"
+#include "video_core/post_processing/fx_effect.h"
+
+namespace VideoCore {
+
+namespace {
+
+std::vector<std::string_view> Split(std::string_view value, char separator) {
+    std::vector<std::string_view> out;
+    size_t start = 0;
+    while (start <= value.size()) {
+        size_t end = value.find(separator, start);
+        if (end == std::string_view::npos) {
+            end = value.size();
+        }
+        out.push_back(value.substr(start, end - start));
+        start = end + 1;
+    }
+    return out;
+}
+
+bool IsSerializableName(std::string_view value) {
+    return value.find_first_of(";|,=") == std::string_view::npos;
+}
+
+} // Anonymous namespace
+
+std::vector<FxChainEntry> ParseFxChain(std::string_view value) {
+    std::vector<FxChainEntry> parsed;
+
+    for (const std::string_view record : Split(value, ';')) {
+        if (record.empty()) {
+            continue;
+        }
+
+        const auto fields = Split(record, '|');
+        if (fields.size() < 2 || fields[0].empty() || fields[1].empty()) {
+            continue;
+        }
+
+        FxChainEntry entry;
+        entry.file = std::string(fields[0]);
+        entry.technique = std::string(fields[1]);
+
+        if (fields.size() >= 3) {
+            for (const std::string_view assignment : Split(fields[2], ',')) {
+                const size_t equals = assignment.find('=');
+                if (equals == std::string_view::npos) {
+                    continue;
+                }
+                const std::string name(assignment.substr(0, equals));
+                if (name.empty()) {
+                    continue;
+                }
+
+                std::array<f32, 4> components{};
+                size_t index = 0;
+                for (const std::string_view piece : Split(assignment.substr(equals + 1), '/')) {
+                    if (index >= components.size()) {
+                        break;
+                    }
+                    const std::string text(piece);
+                    if (!text.empty()) {
+                        components[index] = std::strtof(text.c_str(), nullptr);
+                    }
+                    ++index;
+                }
+                entry.values.emplace(name, components);
+            }
+        }
+
+        parsed.push_back(std::move(entry));
+    }
+
+    return parsed;
+}
+
+std::string SerializeFxChain(std::span<const FxChainEntry> entries) {
+    std::string out;
+
+    for (const auto& entry : entries) {
+        if (!IsSerializableName(entry.file) || !IsSerializableName(entry.technique)) {
+            continue;
+        }
+        if (!out.empty()) {
+            out += ';';
+        }
+        out += entry.file;
+        out += '|';
+        out += entry.technique;
+        out += '|';
+
+        bool first = true;
+        for (const auto& [name, value] : entry.values) {
+            if (!IsSerializableName(name)) {
+                continue;
+            }
+            if (!first) {
+                out += ',';
+            }
+            first = false;
+            out += name;
+            out += '=';
+            for (size_t i = 0; i < value.size(); ++i) {
+                if (i > 0) {
+                    out += '/';
+                }
+                out += fmt::format("{}", value[i]);
+            }
+        }
+    }
+
+    return out;
+}
+
+FxChain& FxChain::Instance() {
+    static FxChain instance;
+    return instance;
+}
+
+FxChainSnapshot FxChain::Snapshot() const {
+    std::scoped_lock lock{mutex};
+    return FxChainSnapshot{
+        .entries = entries,
+        .generation = generation.load(std::memory_order_relaxed),
+    };
+}
+
+std::vector<FxChainEntry> FxChain::Entries() const {
+    std::scoped_lock lock{mutex};
+    return entries;
+}
+
+size_t FxChain::Size() const {
+    std::scoped_lock lock{mutex};
+    return entries.size();
+}
+
+void FxChain::Append(std::string_view file, std::string_view technique) {
+    {
+        std::scoped_lock lock{mutex};
+        FxChainEntry entry;
+        entry.file = std::string(file);
+        entry.technique = std::string(technique);
+        entries.push_back(std::move(entry));
+    }
+    generation.fetch_add(1, std::memory_order_relaxed);
+}
+
+void FxChain::Replace(size_t index, std::string_view file, std::string_view technique) {
+    {
+        std::scoped_lock lock{mutex};
+        if (index >= entries.size()) {
+            return;
+        }
+        if (entries[index].file == file && entries[index].technique == technique) {
+            return;
+        }
+        FxChainEntry entry;
+        entry.file = std::string(file);
+        entry.technique = std::string(technique);
+        entries[index] = std::move(entry);
+    }
+    generation.fetch_add(1, std::memory_order_relaxed);
+}
+
+void FxChain::Remove(size_t index) {
+    {
+        std::scoped_lock lock{mutex};
+        if (index >= entries.size()) {
+            return;
+        }
+        entries.erase(entries.begin() + static_cast<std::ptrdiff_t>(index));
+    }
+    generation.fetch_add(1, std::memory_order_relaxed);
+}
+
+void FxChain::Move(size_t index, int delta) {
+    {
+        std::scoped_lock lock{mutex};
+        if (index >= entries.size()) {
+            return;
+        }
+        const std::ptrdiff_t target = static_cast<std::ptrdiff_t>(index) + delta;
+        if (target < 0 || target >= static_cast<std::ptrdiff_t>(entries.size())) {
+            return;
+        }
+        std::swap(entries[index], entries[static_cast<size_t>(target)]);
+    }
+    generation.fetch_add(1, std::memory_order_relaxed);
+}
+
+void FxChain::Clear() {
+    {
+        std::scoped_lock lock{mutex};
+        entries.clear();
+    }
+    generation.fetch_add(1, std::memory_order_relaxed);
+}
+
+void FxChain::SetValue(size_t index, std::string_view uniform, const std::array<f32, 4>& value) {
+    std::scoped_lock lock{mutex};
+    if (index >= entries.size()) {
+        return;
+    }
+    entries[index].values[std::string(uniform)] = value;
+}
+
+std::array<f32, 4> FxChain::GetValue(size_t index, std::string_view uniform) const {
+    std::scoped_lock lock{mutex};
+    if (index >= entries.size()) {
+        return {};
+    }
+    const auto it = entries[index].values.find(std::string(uniform));
+    if (it == entries[index].values.end()) {
+        return {};
+    }
+    return it->second;
+}
+
+bool FxChain::HasValue(size_t index, std::string_view uniform) const {
+    std::scoped_lock lock{mutex};
+    if (index >= entries.size()) {
+        return false;
+    }
+    return entries[index].values.contains(std::string(uniform));
+}
+
+void FxChain::ResetValues(size_t index) {
+    std::scoped_lock lock{mutex};
+    if (index >= entries.size()) {
+        return;
+    }
+    entries[index].values.clear();
+}
+
+void FxChain::LoadFromSettings() {
+    auto loaded = ParseFxChain(Settings::values.post_shader_chain.GetValue());
+
+    std::scoped_lock lock{mutex};
+    entries = std::move(loaded);
+    generation.fetch_add(1, std::memory_order_relaxed);
+}
+
+void FxChain::StoreToSettings() const {
+    std::string serialized;
+    {
+        std::scoped_lock lock{mutex};
+        serialized = SerializeFxChain(entries);
+    }
+    Settings::values.post_shader_chain.SetValue(serialized);
+}
+
+void FxChain::DropUnknownEntries() {
+    bool changed = false;
+    {
+        std::scoped_lock lock{mutex};
+        const auto removed = std::remove_if(entries.begin(), entries.end(), [](const FxChainEntry& entry) {
+            const FxEffectDesc* effect = FindFxEffect(entry.file);
+            if (effect == nullptr || !effect->Valid()) {
+                return true;
+            }
+            return std::find(effect->techniques.begin(), effect->techniques.end(),
+                             entry.technique) == effect->techniques.end();
+        });
+        if (removed != entries.end()) {
+            entries.erase(removed, entries.end());
+            changed = true;
+        }
+    }
+    if (changed) {
+        generation.fetch_add(1, std::memory_order_relaxed);
+    }
+}
+
+} // namespace VideoCore

src/video_core/post_processing/fx_chain.h

@@ -0,0 +1,76 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <array>
+#include <atomic>
+#include <map>
+#include <mutex>
+#include <span>
+#include <string>
+#include <string_view>
+#include <vector>
+
+#include "common/common_types.h"
+
+namespace VideoCore {
+
+struct FxChainEntry {
+    std::string file;
+    std::string technique;
+    std::map<std::string, std::array<f32, 4>> values;
+};
+
+struct FxChainSnapshot {
+    std::vector<FxChainEntry> entries;
+    u64 generation{};
+};
+
+std::vector<FxChainEntry> ParseFxChain(std::string_view value);
+
+std::string SerializeFxChain(std::span<const FxChainEntry> entries);
+
+class FxChain {
+public:
+    static FxChain& Instance();
+
+    FxChainSnapshot Snapshot() const;
+
+    std::vector<FxChainEntry> Entries() const;
+
+    size_t Size() const;
+
+    void Append(std::string_view file, std::string_view technique);
+
+    void Replace(size_t index, std::string_view file, std::string_view technique);
+
+    void Remove(size_t index);
+
+    void Move(size_t index, int delta);
+
+    void Clear();
+
+    void SetValue(size_t index, std::string_view uniform, const std::array<f32, 4>& value);
+
+    std::array<f32, 4> GetValue(size_t index, std::string_view uniform) const;
+
+    bool HasValue(size_t index, std::string_view uniform) const;
+
+    void ResetValues(size_t index);
+
+    void LoadFromSettings();
+
+    void StoreToSettings() const;
+
+    void DropUnknownEntries();
+
+private:
+    FxChain() = default;
+
+    mutable std::mutex mutex;
+    std::vector<FxChainEntry> entries;
+    std::atomic<u64> generation{1};
+};
+
+} // namespace VideoCore

src/video_core/post_processing/fx_compile.cpp

@@ -0,0 +1,105 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <cstring>
+#include <memory>
+#include <set>
+
+#include "effect_codegen.hpp"
+#include "effect_parser.hpp"
+#include "effect_preprocessor.hpp"
+
+#include "common/fs/fs.h"
+#include "common/fs/fs_util.h"
+#include "video_core/post_processing/fx_compile.h"
+#include "video_core/post_processing/fx_effect.h"
+
+namespace VideoCore {
+
+FxCompileResult CompileFxEffect(const std::filesystem::path& path, u32 width, u32 height,
+                                u32 color_bit_depth) {
+    FxCompileResult result;
+
+    if (!Common::FS::Exists(path)) {
+        result.error = "Effect file not found: " + Common::FS::PathToUTF8String(path);
+        return result;
+    }
+
+    reshadefx::preprocessor preprocessor;
+    preprocessor.add_macro_definition("__RESHADE__", "50000");
+    preprocessor.add_macro_definition("__RESHADE_PERFORMANCE_MODE__", "1");
+    preprocessor.add_macro_definition("__RENDERER__", "0x20000");
+    preprocessor.add_macro_definition("__VENDOR__", "0");
+    preprocessor.add_macro_definition("__DEVICE__", "0");
+    preprocessor.add_macro_definition("__APPLICATION__", "0");
+    preprocessor.add_macro_definition("BUFFER_WIDTH", std::to_string(width));
+    preprocessor.add_macro_definition("BUFFER_HEIGHT", std::to_string(height));
+    preprocessor.add_macro_definition("BUFFER_RCP_WIDTH", "(1.0 / BUFFER_WIDTH)");
+    preprocessor.add_macro_definition("BUFFER_RCP_HEIGHT", "(1.0 / BUFFER_HEIGHT)");
+    preprocessor.add_macro_definition("BUFFER_COLOR_DEPTH", std::to_string(color_bit_depth));
+    preprocessor.add_macro_definition("BUFFER_COLOR_BIT_DEPTH", std::to_string(color_bit_depth));
+
+    for (const auto& include : GetFxIncludePaths(path)) {
+        preprocessor.add_include_path(include);
+    }
+
+    if (!preprocessor.append_file(path)) {
+        result.error = preprocessor.errors();
+        if (result.error.empty()) {
+            result.error = "Failed to preprocess " + Common::FS::PathToUTF8String(path);
+        }
+        return result;
+    }
+
+    std::unique_ptr<reshadefx::codegen> backend(
+        reshadefx::create_codegen_spirv(true, false, false, false, false));
+
+    reshadefx::parser parser;
+    if (!parser.parse(preprocessor.output(), backend.get())) {
+        result.error = parser.errors();
+        if (result.error.empty()) {
+            result.error = "Failed to parse " + Common::FS::PathToUTF8String(path);
+        }
+        return result;
+    }
+
+    result.module = backend->module();
+
+    std::set<std::string> wanted;
+    for (const auto& technique : result.module.techniques) {
+        for (const auto& pass : technique.passes) {
+            if (!pass.vs_entry_point.empty()) {
+                wanted.insert(pass.vs_entry_point);
+            }
+            if (!pass.ps_entry_point.empty()) {
+                wanted.insert(pass.ps_entry_point);
+            }
+        }
+    }
+
+    for (const auto& name : wanted) {
+        std::string binary;
+        std::string assembly;
+        std::string errors;
+        if (!backend->assemble_code_for_entry_point(name, binary, assembly, errors)) {
+            result.error = "Failed to assemble entry point '" + name + "': " + errors;
+            return result;
+        }
+        if (binary.size() % sizeof(u32) != 0) {
+            result.error = "Entry point '" + name + "' produced a malformed SPIR-V module";
+            return result;
+        }
+
+        std::vector<u32> words(binary.size() / sizeof(u32));
+        std::memcpy(words.data(), binary.data(), binary.size());
+        result.entry_points.emplace(name, std::move(words));
+    }
+
+    if (result.entry_points.empty()) {
+        result.error = "Effect declares no usable entry points";
+    }
+
+    return result;
+}
+
+} // namespace VideoCore

src/video_core/post_processing/fx_compile.h

@@ -0,0 +1,29 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <filesystem>
+#include <map>
+#include <string>
+#include <vector>
+
+#include "common/common_types.h"
+#include "effect_module.hpp"
+
+namespace VideoCore {
+
+struct FxCompileResult {
+    reshadefx::effect_module module;
+    std::map<std::string, std::vector<u32>> entry_points;
+    std::string error;
+
+    bool Succeeded() const {
+        return error.empty() && !entry_points.empty();
+    }
+};
+
+FxCompileResult CompileFxEffect(const std::filesystem::path& path, u32 width, u32 height,
+                                u32 color_bit_depth);
+
+} // namespace VideoCore

src/video_core/post_processing/fx_effect.cpp

@@ -0,0 +1,283 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <algorithm>
+
+#include "common/fs/fs.h"
+#include "common/fs/fs_util.h"
+#include "common/fs/path_util.h"
+#include "common/logging.h"
+#include "video_core/post_processing/fx_compile.h"
+#include "video_core/post_processing/fx_effect.h"
+
+namespace VideoCore {
+
+namespace {
+
+constexpr u32 CATALOG_PROBE_WIDTH = 1280;
+constexpr u32 CATALOG_PROBE_HEIGHT = 720;
+constexpr u32 CATALOG_PROBE_DEPTH = 8;
+
+std::vector<FxEffectDesc> catalog;
+
+const reshadefx::annotation* FindAnnotation(const std::vector<reshadefx::annotation>& annotations,
+                                            std::string_view name) {
+    const auto it = std::find_if(annotations.begin(), annotations.end(),
+                                 [&](const reshadefx::annotation& a) { return a.name == name; });
+    if (it == annotations.end()) {
+        return nullptr;
+    }
+    return &*it;
+}
+
+std::string AnnotationString(const std::vector<reshadefx::annotation>& annotations,
+                             std::string_view name) {
+    const reshadefx::annotation* a = FindAnnotation(annotations, name);
+    if (a == nullptr) {
+        return std::string();
+    }
+    return a->value.string_data;
+}
+
+bool AnnotationFloat(const std::vector<reshadefx::annotation>& annotations, std::string_view name,
+                     f32& out) {
+    const reshadefx::annotation* a = FindAnnotation(annotations, name);
+    if (a == nullptr) {
+        return false;
+    }
+    if (a->type.is_floating_point()) {
+        out = a->value.as_float[0];
+        return true;
+    }
+    if (a->type.is_integral()) {
+        out = static_cast<f32>(a->value.as_int[0]);
+        return true;
+    }
+    return false;
+}
+
+FxUiType ParseUiType(std::string_view value) {
+    if (value == "slider") {
+        return FxUiType::Slider;
+    }
+    if (value == "drag") {
+        return FxUiType::Drag;
+    }
+    if (value == "combo") {
+        return FxUiType::Combo;
+    }
+    if (value == "radio") {
+        return FxUiType::Radio;
+    }
+    if (value == "check" || value == "checkbox") {
+        return FxUiType::CheckBox;
+    }
+    if (value == "color") {
+        return FxUiType::Color;
+    }
+    if (value == "input") {
+        return FxUiType::InputBox;
+    }
+    return FxUiType::Hidden;
+}
+
+std::vector<std::string> SplitItems(const std::string& items) {
+    std::vector<std::string> out;
+    std::string current;
+    for (const char c : items) {
+        if (c == '\0') {
+            out.push_back(current);
+            current.clear();
+            continue;
+        }
+        current += c;
+    }
+    if (!current.empty()) {
+        out.push_back(current);
+    }
+    return out;
+}
+
+FxUniformDesc DescribeUniform(const reshadefx::uniform& info) {
+    FxUniformDesc desc;
+    desc.name = info.name;
+    desc.components = std::min<u32>(info.type.components(), 4);
+
+    if (info.type.is_boolean()) {
+        desc.kind = FxUniformKind::Boolean;
+    } else if (info.type.is_integral()) {
+        desc.kind = FxUniformKind::Integer;
+    } else {
+        desc.kind = FxUniformKind::Floating;
+    }
+
+    desc.label = AnnotationString(info.annotations, "ui_label");
+    if (desc.label.empty()) {
+        desc.label = info.name;
+    }
+    desc.tooltip = AnnotationString(info.annotations, "ui_tooltip");
+    desc.category = AnnotationString(info.annotations, "ui_category");
+    desc.ui_type = ParseUiType(AnnotationString(info.annotations, "ui_type"));
+    desc.items = SplitItems(AnnotationString(info.annotations, "ui_items"));
+
+    if (desc.kind == FxUniformKind::Boolean) {
+        desc.ui_min = 0.0f;
+        desc.ui_max = 1.0f;
+        desc.ui_step = 1.0f;
+    } else if (desc.kind == FxUniformKind::Integer) {
+        desc.ui_min = 0.0f;
+        desc.ui_max = 100.0f;
+        desc.ui_step = 1.0f;
+    }
+
+    void(AnnotationFloat(info.annotations, "ui_min", desc.ui_min));
+    void(AnnotationFloat(info.annotations, "ui_max", desc.ui_max));
+    void(AnnotationFloat(info.annotations, "ui_step", desc.ui_step));
+
+    if (desc.ui_step <= 0.0f) {
+        desc.ui_step = 0.01f;
+        if (desc.kind != FxUniformKind::Floating) {
+            desc.ui_step = 1.0f;
+        }
+    }
+    if (desc.ui_max < desc.ui_min) {
+        std::swap(desc.ui_min, desc.ui_max);
+    }
+
+    if (info.has_initializer_value) {
+        for (u32 i = 0; i < desc.components; ++i) {
+            if (desc.kind == FxUniformKind::Floating) {
+                desc.default_value[i] = info.initializer_value.as_float[i];
+            } else {
+                desc.default_value[i] = static_cast<f32>(info.initializer_value.as_int[i]);
+            }
+        }
+    }
+
+    return desc;
+}
+
+FxEffectDesc DescribeEffect(const std::filesystem::path& path, const std::filesystem::path& root) {
+    FxEffectDesc desc;
+    desc.file = Common::FS::PathToUTF8String(std::filesystem::relative(path, root));
+    desc.name = Common::FS::PathToUTF8String(path.stem());
+
+    const auto compiled =
+        CompileFxEffect(path, CATALOG_PROBE_WIDTH, CATALOG_PROBE_HEIGHT, CATALOG_PROBE_DEPTH);
+    if (!compiled.Succeeded()) {
+        desc.error = compiled.error;
+        return desc;
+    }
+
+    for (const auto& technique : compiled.module.techniques) {
+        desc.techniques.push_back(technique.name);
+    }
+
+    for (const auto& uniform : compiled.module.uniforms) {
+        FxUniformDesc uniform_desc = DescribeUniform(uniform);
+        if (uniform_desc.ui_type == FxUiType::Hidden) {
+            continue;
+        }
+        desc.uniforms.push_back(std::move(uniform_desc));
+    }
+
+    return desc;
+}
+
+} // Anonymous namespace
+
+std::filesystem::path GetFxRootDirectory() {
+    return Common::FS::GetEdenPath(Common::FS::EdenPath::PostShaderDir);
+}
+
+std::vector<std::filesystem::path> GetFxIncludePaths(const std::filesystem::path& effect_path) {
+    const auto root = GetFxRootDirectory();
+    std::vector<std::filesystem::path> paths;
+    paths.push_back(effect_path.parent_path());
+    paths.push_back(root);
+    paths.push_back(root / "Shaders");
+
+    const auto last = std::unique(paths.begin(), paths.end());
+    paths.erase(last, paths.end());
+    return paths;
+}
+
+std::filesystem::path ResolveFxTexturePath(const std::filesystem::path& effect_path,
+                                           std::string_view source) {
+    const auto root = GetFxRootDirectory();
+    const std::filesystem::path name{source};
+
+    const std::array candidates{
+        effect_path.parent_path() / name,
+        root / "Textures" / name,
+        root / name,
+    };
+
+    for (const auto& candidate : candidates) {
+        if (Common::FS::Exists(candidate)) {
+            return candidate;
+        }
+    }
+
+    return std::filesystem::path();
+}
+
+void ReloadFxCatalog() {
+    catalog.clear();
+
+    const auto root = GetFxRootDirectory();
+    if (!Common::FS::Exists(root)) {
+        void(Common::FS::CreateDirs(root));
+        return;
+    }
+
+    std::vector<std::filesystem::path> effect_files;
+    Common::FS::IterateDirEntriesRecursively(
+        root,
+        [&](const std::filesystem::directory_entry& entry) {
+            if (entry.path().extension() == ".fx") {
+                effect_files.push_back(entry.path());
+            }
+            return true;
+        },
+        Common::FS::DirEntryFilter::File);
+
+    std::sort(effect_files.begin(), effect_files.end());
+
+    for (const auto& file : effect_files) {
+        FxEffectDesc desc = DescribeEffect(file, root);
+        if (!desc.error.empty()) {
+            LOG_WARNING(Render, "Post-processing effect '{}' failed to compile:\n{}", desc.file,
+                        desc.error);
+        }
+        catalog.push_back(std::move(desc));
+    }
+
+    const size_t usable = std::count_if(catalog.begin(), catalog.end(),
+                                        [](const FxEffectDesc& d) { return d.Valid(); });
+    LOG_INFO(Render, "Loaded {} post-processing effects ({} usable)", catalog.size(), usable);
+}
+
+const std::vector<FxEffectDesc>& GetFxCatalog() {
+    return catalog;
+}
+
+const FxEffectDesc* FindFxEffect(std::string_view file) {
+    const auto it = std::find_if(catalog.begin(), catalog.end(),
+                                 [&](const FxEffectDesc& d) { return d.file == file; });
+    if (it == catalog.end()) {
+        return nullptr;
+    }
+    return &*it;
+}
+
+const FxUniformDesc* FindFxUniform(const FxEffectDesc& effect, std::string_view name) {
+    const auto it = std::find_if(effect.uniforms.begin(), effect.uniforms.end(),
+                                 [&](const FxUniformDesc& u) { return u.name == name; });
+    if (it == effect.uniforms.end()) {
+        return nullptr;
+    }
+    return &*it;
+}
+
+} // namespace VideoCore

src/video_core/post_processing/fx_effect.h

@@ -0,0 +1,75 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <array>
+#include <filesystem>
+#include <string>
+#include <string_view>
+#include <vector>
+
+#include "common/common_types.h"
+
+namespace VideoCore {
+
+enum class FxUniformKind {
+    Boolean,
+    Integer,
+    Floating,
+};
+
+enum class FxUiType {
+    Hidden,
+    Slider,
+    Drag,
+    Combo,
+    Radio,
+    CheckBox,
+    Color,
+    InputBox,
+};
+
+struct FxUniformDesc {
+    std::string name;
+    std::string label;
+    std::string tooltip;
+    std::string category;
+    FxUniformKind kind{FxUniformKind::Floating};
+    u32 components{1};
+    FxUiType ui_type{FxUiType::Hidden};
+    f32 ui_min{0.0f};
+    f32 ui_max{1.0f};
+    f32 ui_step{0.01f};
+    std::vector<std::string> items;
+    std::array<f32, 4> default_value{};
+};
+
+struct FxEffectDesc {
+    std::string file;
+    std::string name;
+    std::vector<std::string> techniques;
+    std::vector<FxUniformDesc> uniforms;
+    std::string error;
+
+    bool Valid() const {
+        return error.empty() && !techniques.empty();
+    }
+};
+
+std::filesystem::path GetFxRootDirectory();
+
+std::vector<std::filesystem::path> GetFxIncludePaths(const std::filesystem::path& effect_path);
+
+std::filesystem::path ResolveFxTexturePath(const std::filesystem::path& effect_path,
+                                           std::string_view source);
+
+void ReloadFxCatalog();
+
+const std::vector<FxEffectDesc>& GetFxCatalog();
+
+const FxEffectDesc* FindFxEffect(std::string_view file);
+
+const FxUniformDesc* FindFxUniform(const FxEffectDesc& effect, std::string_view name);
+
+} // namespace VideoCore

src/video_core/renderer_vulkan/present/layer.cpp

@@ -18,6 +18,10 @@
 #include "video_core/renderer_vulkan/present/sgsr.h"
 #include "video_core/renderer_vulkan/present/fxaa.h"
 #include "video_core/renderer_vulkan/present/layer.h"
+#ifdef HAS_RESHADE
+#include "video_core/post_processing/fx_chain.h"
+#include "video_core/renderer_vulkan/present/post_process.h"
+#endif
 #include "video_core/renderer_vulkan/present/present_push_constants.h"
 #include "video_core/renderer_vulkan/present/smaa.h"
 #include "video_core/renderer_vulkan/present/util.h"
@@ -93,6 +97,9 @@ void Layer::ConfigureDraw(const Device& device, PresentPushConstants* out_push_c
 
     RefreshResources(device, framebuffer);
     SetAntiAliasPass(device);
+#ifdef HAS_RESHADE
+    SetPostProcessPass(device);
+#endif
 
     // Finish any pending renderpass
     scheduler.RequestOutsideRenderPassOperationContext();
@@ -115,6 +122,12 @@ void Layer::ConfigureDraw(const Device& device, PresentPushConstants* out_push_c
         smaa->Draw(device, scheduler, image_index, &source_image, &source_image_view);
     }
 
+#ifdef HAS_RESHADE
+    if (post_process.has_value()) {
+        post_process->Draw(device, scheduler, image_index, &source_image, &source_image_view);
+    }
+#endif
+
     auto crop_rect = Tegra::NormalizeCrop(framebuffer, texture_width, texture_height);
     const VkExtent2D render_extent{
         .width = scaled_width,
@@ -214,6 +227,40 @@ void Layer::SetAntiAliasPass(const Device& device) {
     }
 }
 
+#ifdef HAS_RESHADE
+void Layer::SetPostProcessPass(const Device& device) {
+    const VkExtent2D render_area{
+        .width = Settings::values.resolution_info.ScaleUp(raw_width),
+        .height = Settings::values.resolution_info.ScaleUp(raw_height),
+    };
+
+    const u64 generation = VideoCore::FxChain::Instance().Snapshot().generation;
+
+    if (post_process_generation == generation && post_process_extent.width == render_area.width &&
+        post_process_extent.height == render_area.height) {
+        return;
+    }
+
+    for (const u64 tick : resource_ticks) {
+        scheduler.Wait(tick);
+    }
+
+    post_process_generation = generation;
+    post_process_extent = render_area;
+    post_process.reset();
+
+    if (VideoCore::FxChain::Instance().Size() == 0) {
+        return;
+    }
+
+    post_process.emplace(device, memory_allocator, scheduler, image_count, render_area);
+
+    if (post_process->Empty()) {
+        post_process.reset();
+    }
+}
+#endif
+
 void Layer::ReleaseRawImages() {
     for (const u64 tick : resource_ticks) {
         scheduler.Wait(tick);

src/video_core/renderer_vulkan/present/layer.h

@@ -15,6 +15,9 @@
 #include "video_core/renderer_vulkan/present/fsr.h"
 #include "video_core/renderer_vulkan/present/sgsr.h"
 #include "video_core/renderer_vulkan/present/fxaa.h"
+#ifdef HAS_RESHADE
+#include "video_core/renderer_vulkan/present/post_process.h"
+#endif
 #include "video_core/renderer_vulkan/present/smaa.h"
 
 namespace Layout {
@@ -66,6 +69,9 @@ private:
 
     void RefreshResources(const Device& device, const Tegra::FramebufferConfig& framebuffer);
     void SetAntiAliasPass(const Device& device);
+#ifdef HAS_RESHADE
+    void SetPostProcessPass(const Device& device);
+#endif
     void ReleaseRawImages();
 
     u64 CalculateBufferSize(const Tegra::FramebufferConfig& framebuffer) const;
@@ -95,6 +101,11 @@ private:
     Settings::AntiAliasing anti_alias_setting{};
     std::variant<std::monostate, FXAA, SMAA> anti_alias{};
     std::variant<std::monostate, SGSR, FSR> sr_filter{};
+#ifdef HAS_RESHADE
+    std::optional<PostProcessChain> post_process{};
+    u64 post_process_generation{};
+    VkExtent2D post_process_extent{};
+#endif
     std::vector<u64> resource_ticks{};
 };
 

src/video_core/renderer_vulkan/present/post_process.cpp

@@ -0,0 +1,898 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <algorithm>
+#include <cstring>
+#include <random>
+
+#include "common/fs/fs.h"
+#include "common/fs/fs_util.h"
+#include "common/logging.h"
+#include "video_core/post_processing/fx_chain.h"
+#include "video_core/post_processing/fx_compile.h"
+#include "video_core/post_processing/fx_effect.h"
+#include "video_core/renderer_vulkan/present/post_process.h"
+#include "video_core/renderer_vulkan/present/util.h"
+#include "video_core/renderer_vulkan/vk_scheduler.h"
+#include "video_core/vulkan_common/vulkan_device.h"
+
+namespace Vulkan {
+
+namespace {
+
+constexpr VkFormat BACKBUFFER_FORMAT = VK_FORMAT_R16G16B16A16_SFLOAT;
+constexpr size_t NO_TEXTURE = ~size_t{0};
+
+VkFormat ToVkFormat(reshadefx::texture_format format) {
+    switch (format) {
+    case reshadefx::texture_format::r8:
+        return VK_FORMAT_R8_UNORM;
+    case reshadefx::texture_format::r16f:
+        return VK_FORMAT_R16_SFLOAT;
+    case reshadefx::texture_format::r32f:
+        return VK_FORMAT_R32_SFLOAT;
+    case reshadefx::texture_format::rg8:
+        return VK_FORMAT_R8G8_UNORM;
+    case reshadefx::texture_format::rg16:
+        return VK_FORMAT_R16G16_UNORM;
+    case reshadefx::texture_format::rg16f:
+        return VK_FORMAT_R16G16_SFLOAT;
+    case reshadefx::texture_format::rg32f:
+        return VK_FORMAT_R32G32_SFLOAT;
+    case reshadefx::texture_format::rgba8:
+        return VK_FORMAT_R8G8B8A8_UNORM;
+    case reshadefx::texture_format::rgba16:
+        return VK_FORMAT_R16G16B16A16_UNORM;
+    case reshadefx::texture_format::rgba16f:
+        return VK_FORMAT_R16G16B16A16_SFLOAT;
+    case reshadefx::texture_format::rgba32f:
+        return VK_FORMAT_R32G32B32A32_SFLOAT;
+    case reshadefx::texture_format::rgb10a2:
+        return VK_FORMAT_A2B10G10R10_UNORM_PACK32;
+    default:
+        return VK_FORMAT_R8G8B8A8_UNORM;
+    }
+}
+
+VkSamplerAddressMode ToAddressMode(reshadefx::texture_address_mode mode) {
+    switch (mode) {
+    case reshadefx::texture_address_mode::wrap:
+        return VK_SAMPLER_ADDRESS_MODE_REPEAT;
+    case reshadefx::texture_address_mode::mirror:
+        return VK_SAMPLER_ADDRESS_MODE_MIRRORED_REPEAT;
+    case reshadefx::texture_address_mode::border:
+        return VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_BORDER;
+    case reshadefx::texture_address_mode::clamp:
+    default:
+        return VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
+    }
+}
+
+VkBlendFactor ToBlendFactor(reshadefx::blend_factor func) {
+    switch (func) {
+    case reshadefx::blend_factor::zero:
+        return VK_BLEND_FACTOR_ZERO;
+    case reshadefx::blend_factor::source_color:
+        return VK_BLEND_FACTOR_SRC_COLOR;
+    case reshadefx::blend_factor::source_alpha:
+        return VK_BLEND_FACTOR_SRC_ALPHA;
+    case reshadefx::blend_factor::one_minus_source_color:
+        return VK_BLEND_FACTOR_ONE_MINUS_SRC_COLOR;
+    case reshadefx::blend_factor::one_minus_source_alpha:
+        return VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;
+    case reshadefx::blend_factor::dest_color:
+        return VK_BLEND_FACTOR_DST_COLOR;
+    case reshadefx::blend_factor::dest_alpha:
+        return VK_BLEND_FACTOR_DST_ALPHA;
+    case reshadefx::blend_factor::one_minus_dest_color:
+        return VK_BLEND_FACTOR_ONE_MINUS_DST_COLOR;
+    case reshadefx::blend_factor::one_minus_dest_alpha:
+        return VK_BLEND_FACTOR_ONE_MINUS_DST_ALPHA;
+    case reshadefx::blend_factor::one:
+    default:
+        return VK_BLEND_FACTOR_ONE;
+    }
+}
+
+VkBlendOp ToBlendOp(reshadefx::blend_op op) {
+    switch (op) {
+    case reshadefx::blend_op::subtract:
+        return VK_BLEND_OP_SUBTRACT;
+    case reshadefx::blend_op::reverse_subtract:
+        return VK_BLEND_OP_REVERSE_SUBTRACT;
+    case reshadefx::blend_op::min:
+        return VK_BLEND_OP_MIN;
+    case reshadefx::blend_op::max:
+        return VK_BLEND_OP_MAX;
+    case reshadefx::blend_op::add:
+    default:
+        return VK_BLEND_OP_ADD;
+    }
+}
+
+VkPrimitiveTopology ToTopology(reshadefx::primitive_topology topology) {
+    switch (topology) {
+    case reshadefx::primitive_topology::point_list:
+        return VK_PRIMITIVE_TOPOLOGY_POINT_LIST;
+    case reshadefx::primitive_topology::line_list:
+        return VK_PRIMITIVE_TOPOLOGY_LINE_LIST;
+    case reshadefx::primitive_topology::line_strip:
+        return VK_PRIMITIVE_TOPOLOGY_LINE_STRIP;
+    case reshadefx::primitive_topology::triangle_strip:
+        return VK_PRIMITIVE_TOPOLOGY_TRIANGLE_STRIP;
+    case reshadefx::primitive_topology::triangle_list:
+    default:
+        return VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;
+    }
+}
+
+vk::RenderPass CreateFxRenderPass(const Device& device, VkFormat format, bool clear) {
+    VkAttachmentLoadOp load_op = VK_ATTACHMENT_LOAD_OP_LOAD;
+    VkImageLayout initial_layout = VK_IMAGE_LAYOUT_GENERAL;
+    if (clear) {
+        load_op = VK_ATTACHMENT_LOAD_OP_CLEAR;
+        initial_layout = VK_IMAGE_LAYOUT_UNDEFINED;
+    }
+
+    const VkAttachmentDescription attachment{
+        .flags = 0,
+        .format = format,
+        .samples = VK_SAMPLE_COUNT_1_BIT,
+        .loadOp = load_op,
+        .storeOp = VK_ATTACHMENT_STORE_OP_STORE,
+        .stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE,
+        .stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE,
+        .initialLayout = initial_layout,
+        .finalLayout = VK_IMAGE_LAYOUT_GENERAL,
+    };
+
+    const VkAttachmentReference reference{
+        .attachment = 0,
+        .layout = VK_IMAGE_LAYOUT_GENERAL,
+    };
+
+    const VkSubpassDescription subpass{
+        .flags = 0,
+        .pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS,
+        .inputAttachmentCount = 0,
+        .pInputAttachments = nullptr,
+        .colorAttachmentCount = 1,
+        .pColorAttachments = &reference,
+        .pResolveAttachments = nullptr,
+        .pDepthStencilAttachment = nullptr,
+        .preserveAttachmentCount = 0,
+        .pPreserveAttachments = nullptr,
+    };
+
+    return device.GetLogical().CreateRenderPass(VkRenderPassCreateInfo{
+        .sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO,
+        .pNext = nullptr,
+        .flags = 0,
+        .attachmentCount = 1,
+        .pAttachments = &attachment,
+        .subpassCount = 1,
+        .pSubpasses = &subpass,
+        .dependencyCount = 0,
+        .pDependencies = nullptr,
+    });
+}
+
+vk::Pipeline CreateFxPipeline(const Device& device, vk::RenderPass& renderpass,
+                              vk::PipelineLayout& layout, VkShaderModule vertex_shader,
+                              VkShaderModule fragment_shader,
+                              const reshadefx::pass& pass) {
+    const std::array<VkPipelineShaderStageCreateInfo, 2> stages{{
+        {
+            .sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
+            .pNext = nullptr,
+            .flags = 0,
+            .stage = VK_SHADER_STAGE_VERTEX_BIT,
+            .module = vertex_shader,
+            .pName = pass.vs_entry_point.c_str(),
+            .pSpecializationInfo = nullptr,
+        },
+        {
+            .sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
+            .pNext = nullptr,
+            .flags = 0,
+            .stage = VK_SHADER_STAGE_FRAGMENT_BIT,
+            .module = fragment_shader,
+            .pName = pass.ps_entry_point.c_str(),
+            .pSpecializationInfo = nullptr,
+        },
+    }};
+
+    constexpr VkPipelineVertexInputStateCreateInfo vertex_input{
+        .sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO,
+        .pNext = nullptr,
+        .flags = 0,
+        .vertexBindingDescriptionCount = 0,
+        .pVertexBindingDescriptions = nullptr,
+        .vertexAttributeDescriptionCount = 0,
+        .pVertexAttributeDescriptions = nullptr,
+    };
+
+    const VkPipelineInputAssemblyStateCreateInfo input_assembly{
+        .sType = VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO,
+        .pNext = nullptr,
+        .flags = 0,
+        .topology = ToTopology(pass.topology),
+        .primitiveRestartEnable = VK_FALSE,
+    };
+
+    constexpr VkPipelineViewportStateCreateInfo viewport_state{
+        .sType = VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO,
+        .pNext = nullptr,
+        .flags = 0,
+        .viewportCount = 1,
+        .pViewports = nullptr,
+        .scissorCount = 1,
+        .pScissors = nullptr,
+    };
+
+    constexpr VkPipelineRasterizationStateCreateInfo rasterization{
+        .sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO,
+        .pNext = nullptr,
+        .flags = 0,
+        .depthClampEnable = VK_FALSE,
+        .rasterizerDiscardEnable = VK_FALSE,
+        .polygonMode = VK_POLYGON_MODE_FILL,
+        .cullMode = VK_CULL_MODE_NONE,
+        .frontFace = VK_FRONT_FACE_COUNTER_CLOCKWISE,
+        .depthBiasEnable = VK_FALSE,
+        .depthBiasConstantFactor = 0.0f,
+        .depthBiasClamp = 0.0f,
+        .depthBiasSlopeFactor = 0.0f,
+        .lineWidth = 1.0f,
+    };
+
+    constexpr VkPipelineMultisampleStateCreateInfo multisampling{
+        .sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO,
+        .pNext = nullptr,
+        .flags = 0,
+        .rasterizationSamples = VK_SAMPLE_COUNT_1_BIT,
+        .sampleShadingEnable = VK_FALSE,
+        .minSampleShading = 0.0f,
+        .pSampleMask = nullptr,
+        .alphaToCoverageEnable = VK_FALSE,
+        .alphaToOneEnable = VK_FALSE,
+    };
+
+    VkBool32 blend_enable = VK_FALSE;
+    if (pass.blend_enable[0]) {
+        blend_enable = VK_TRUE;
+    }
+
+    const VkPipelineColorBlendAttachmentState blending{
+        .blendEnable = blend_enable,
+        .srcColorBlendFactor = ToBlendFactor(pass.source_color_blend_factor[0]),
+        .dstColorBlendFactor = ToBlendFactor(pass.dest_color_blend_factor[0]),
+        .colorBlendOp = ToBlendOp(pass.color_blend_op[0]),
+        .srcAlphaBlendFactor = ToBlendFactor(pass.source_alpha_blend_factor[0]),
+        .dstAlphaBlendFactor = ToBlendFactor(pass.dest_alpha_blend_factor[0]),
+        .alphaBlendOp = ToBlendOp(pass.alpha_blend_op[0]),
+        .colorWriteMask = static_cast<VkColorComponentFlags>(pass.render_target_write_mask[0] & 0xF),
+    };
+
+    const VkPipelineColorBlendStateCreateInfo color_blend{
+        .sType = VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO,
+        .pNext = nullptr,
+        .flags = 0,
+        .logicOpEnable = VK_FALSE,
+        .logicOp = VK_LOGIC_OP_COPY,
+        .attachmentCount = 1,
+        .pAttachments = &blending,
+        .blendConstants = {0.0f, 0.0f, 0.0f, 0.0f},
+    };
+
+    constexpr std::array dynamic_states{
+        VK_DYNAMIC_STATE_VIEWPORT,
+        VK_DYNAMIC_STATE_SCISSOR,
+    };
+
+    const VkPipelineDynamicStateCreateInfo dynamic_state{
+        .sType = VK_STRUCTURE_TYPE_PIPELINE_DYNAMIC_STATE_CREATE_INFO,
+        .pNext = nullptr,
+        .flags = 0,
+        .dynamicStateCount = static_cast<u32>(dynamic_states.size()),
+        .pDynamicStates = dynamic_states.data(),
+    };
+
+    return device.GetLogical().CreateGraphicsPipeline(VkGraphicsPipelineCreateInfo{
+        .sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO,
+        .pNext = nullptr,
+        .flags = 0,
+        .stageCount = static_cast<u32>(stages.size()),
+        .pStages = stages.data(),
+        .pVertexInputState = &vertex_input,
+        .pInputAssemblyState = &input_assembly,
+        .pTessellationState = nullptr,
+        .pViewportState = &viewport_state,
+        .pRasterizationState = &rasterization,
+        .pMultisampleState = &multisampling,
+        .pDepthStencilState = nullptr,
+        .pColorBlendState = &color_blend,
+        .pDynamicState = &dynamic_state,
+        .layout = *layout,
+        .renderPass = *renderpass,
+        .subpass = 0,
+        .basePipelineHandle = nullptr,
+        .basePipelineIndex = 0,
+    });
+}
+
+} // Anonymous namespace
+
+PostProcessChain::PostProcessChain(const Device& device, MemoryAllocator& allocator,
+                                   Scheduler& scheduler, size_t image_count, VkExtent2D extent)
+    : m_extent(extent)
+    , m_image_count(u32(image_count))
+{
+    m_start = std::chrono::steady_clock::now();
+    m_previous = m_start;
+
+    CreatePingPongImages(device, allocator);
+
+    m_fallback_sampler = CreateWrappedSampler(device);
+    m_fallback_image = CreateWrappedImage(allocator, VkExtent2D{1, 1}, VK_FORMAT_R8G8B8A8_UNORM);
+    m_fallback_view = CreateWrappedImageView(device, m_fallback_image, VK_FORMAT_R8G8B8A8_UNORM);
+
+    if (!BuildEffects(device, allocator, scheduler)) {
+        m_effects.clear();
+    }
+}
+
+PostProcessChain::~PostProcessChain() = default;
+
+bool PostProcessChain::Empty() const {
+    return m_effects.empty();
+}
+
+void PostProcessChain::CreatePingPongImages(const Device& device, MemoryAllocator& allocator) {
+    m_frames.resize(m_image_count);
+    for (auto& frame : m_frames) {
+        for (size_t i = 0; i < frame.images.size(); ++i) {
+            frame.images[i] = CreateWrappedImage(allocator, m_extent, BACKBUFFER_FORMAT);
+            frame.views[i] = CreateWrappedImageView(device, frame.images[i], BACKBUFFER_FORMAT);
+        }
+    }
+}
+
+bool PostProcessChain::BuildEffects(const Device& device, MemoryAllocator& allocator,
+                                    Scheduler& scheduler) {
+    const auto snapshot = VideoCore::FxChain::Instance().Snapshot();
+    if (snapshot.entries.empty()) {
+        return true;
+    }
+
+    const auto root = VideoCore::GetFxRootDirectory();
+
+    for (size_t entry_index = 0; entry_index < snapshot.entries.size(); ++entry_index) {
+        const auto& entry = snapshot.entries[entry_index];
+        const auto path = root / entry.file;
+
+        const auto compiled = VideoCore::CompileFxEffect(path, m_extent.width, m_extent.height, 8);
+        if (!compiled.Succeeded()) {
+            LOG_ERROR(Render_Vulkan, "Post-processing effect '{}' failed to compile:\n{}",
+                      entry.file, compiled.error);
+            continue;
+        }
+
+        const auto& module = compiled.module;
+
+        const auto technique = std::find_if(
+            module.techniques.begin(), module.techniques.end(),
+            [&](const reshadefx::technique& t) { return t.name == entry.technique; });
+        if (technique == module.techniques.end()) {
+            LOG_ERROR(Render_Vulkan, "Effect '{}' has no technique '{}'", entry.file,
+                      entry.technique);
+            continue;
+        }
+
+        Effect effect;
+        effect.entry_index = entry_index;
+        effect.file = entry.file;
+        effect.uniform_size = module.total_uniform_size;
+        for (const auto& [name, words] : compiled.entry_points) {
+            effect.shaders.emplace(name, CreateWrappedShaderModule(device, words));
+        }
+
+        for (const auto& texture : module.textures) {
+            Texture out;
+            out.name = texture.unique_name;
+            out.extent = VkExtent2D{texture.width, texture.height};
+            out.format = ToVkFormat(texture.format);
+
+            if (texture.semantic == "COLOR") {
+                out.is_backbuffer = true;
+                effect.textures.push_back(std::move(out));
+                continue;
+            }
+            if (texture.semantic == "DEPTH") {
+                effect.textures.push_back(std::move(out));
+                continue;
+            }
+
+            out.image = CreateWrappedImage(allocator, out.extent, out.format);
+            out.view = CreateWrappedImageView(device, out.image, out.format);
+            effect.textures.push_back(std::move(out));
+        }
+
+        for (const auto& sampler : module.samplers) {
+            Sampler out;
+            out.texture_index = NO_TEXTURE;
+            for (size_t i = 0; i < effect.textures.size(); ++i) {
+                if (effect.textures[i].name == sampler.texture_name) {
+                    out.texture_index = i;
+                    break;
+                }
+            }
+
+            VkFilter mag_filter = VK_FILTER_LINEAR;
+            VkFilter min_filter = VK_FILTER_LINEAR;
+            VkSamplerMipmapMode mip_mode = VK_SAMPLER_MIPMAP_MODE_LINEAR;
+            const u32 filter = static_cast<u32>(sampler.filter);
+            if ((filter & 0x10) == 0) {
+                min_filter = VK_FILTER_NEAREST;
+            }
+            if ((filter & 0x04) == 0) {
+                mag_filter = VK_FILTER_NEAREST;
+            }
+            if ((filter & 0x01) == 0) {
+                mip_mode = VK_SAMPLER_MIPMAP_MODE_NEAREST;
+            }
+
+            out.sampler = device.GetLogical().CreateSampler(VkSamplerCreateInfo{
+                .sType = VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO,
+                .pNext = nullptr,
+                .flags = 0,
+                .magFilter = mag_filter,
+                .minFilter = min_filter,
+                .mipmapMode = mip_mode,
+                .addressModeU = ToAddressMode(sampler.address_u),
+                .addressModeV = ToAddressMode(sampler.address_v),
+                .addressModeW = ToAddressMode(sampler.address_w),
+                .mipLodBias = sampler.lod_bias,
+                .anisotropyEnable = VK_FALSE,
+                .maxAnisotropy = 1.0f,
+                .compareEnable = VK_FALSE,
+                .compareOp = VK_COMPARE_OP_NEVER,
+                .minLod = sampler.min_lod,
+                .maxLod = sampler.max_lod,
+                .borderColor = VK_BORDER_COLOR_FLOAT_TRANSPARENT_BLACK,
+                .unnormalizedCoordinates = VK_FALSE,
+            });
+
+            effect.samplers.push_back(std::move(out));
+        }
+
+        for (const auto& uniform : module.uniforms) {
+            UniformWrite write;
+            write.name = uniform.name;
+            write.offset = uniform.offset;
+            write.components = std::min<u32>(uniform.type.components(), 4);
+            write.kind = UniformKind::Floating;
+            if (uniform.type.is_boolean()) {
+                write.kind = UniformKind::Boolean;
+            } else if (uniform.type.is_integral()) {
+                write.kind = UniformKind::Integer;
+            }
+
+            for (const auto& annotation : uniform.annotations) {
+                if (annotation.name != "source") {
+                    continue;
+                }
+                const std::string& source = annotation.value.string_data;
+                if (source == "frametime") {
+                    write.source = UniformSource::FrameTime;
+                } else if (source == "framecount") {
+                    write.source = UniformSource::FrameCount;
+                } else if (source == "timer") {
+                    write.source = UniformSource::Timer;
+                } else if (source == "random") {
+                    write.source = UniformSource::Random;
+                } else if (source == "pingpong") {
+                    write.source = UniformSource::PingPong;
+                }
+            }
+
+            if (uniform.has_initializer_value) {
+                for (u32 i = 0; i < write.components; ++i) {
+                    if (write.kind == UniformKind::Floating) {
+                        write.fallback[i] = uniform.initializer_value.as_float[i];
+                    } else {
+                        write.fallback[i] = static_cast<f32>(uniform.initializer_value.as_int[i]);
+                    }
+                }
+            }
+
+            const auto override = entry.values.find(uniform.name);
+            if (override != entry.values.end()) {
+                write.fallback = override->second;
+            }
+
+            write.args = {0.0f, 1.0f, 1.0f, 0.0f};
+            for (const auto& annotation : uniform.annotations) {
+                if (annotation.name == "min" && annotation.type.is_floating_point()) {
+                    write.args[0] = annotation.value.as_float[0];
+                }
+                if (annotation.name == "max" && annotation.type.is_floating_point()) {
+                    write.args[1] = annotation.value.as_float[0];
+                }
+                if (annotation.name == "step" && annotation.type.is_floating_point()) {
+                    write.args[2] = annotation.value.as_float[0];
+                }
+            }
+            write.state = write.args[0];
+
+            effect.uniforms.push_back(std::move(write));
+        }
+
+        effect.uniform_layout = CreateWrappedDescriptorSetLayout(
+            device, std::array{VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER},
+            VK_SHADER_STAGE_VERTEX_BIT | VK_SHADER_STAGE_FRAGMENT_BIT);
+
+        for (const auto& pass : technique->passes) {
+            Pass out;
+            out.num_vertices = pass.num_vertices;
+            out.clear = pass.clear_render_targets != 0;
+            out.target_texture = NO_TEXTURE;
+            out.extent = m_extent;
+
+            const std::string& target = pass.render_target_names[0];
+            if (target.empty()) {
+                out.writes_backbuffer = true;
+            } else {
+                for (size_t i = 0; i < effect.textures.size(); ++i) {
+                    if (effect.textures[i].name == target) {
+                        out.target_texture = i;
+                        out.extent = effect.textures[i].extent;
+                        break;
+                    }
+                }
+                if (out.target_texture == NO_TEXTURE) {
+                    LOG_WARNING(Render_Vulkan, "Effect '{}' pass targets unknown texture '{}'",
+                                entry.file, target);
+                    out.writes_backbuffer = true;
+                }
+            }
+
+            if (pass.viewport_width != 0 && pass.viewport_height != 0) {
+                out.extent = VkExtent2D{pass.viewport_width, pass.viewport_height};
+            }
+
+            VkFormat target_format = BACKBUFFER_FORMAT;
+            if (!out.writes_backbuffer) {
+                target_format = effect.textures[out.target_texture].format;
+            }
+
+            u32 binding_count = 0;
+            for (const auto& binding : pass.sampler_bindings) {
+                SamplerBinding entry_binding;
+                entry_binding.binding = binding.entry_point_binding;
+                entry_binding.sampler_index = binding.index;
+                out.sampler_bindings.push_back(entry_binding);
+                binding_count = std::max(binding_count, binding.entry_point_binding + 1);
+            }
+
+            const std::vector<VkDescriptorType> sampler_types(
+                std::max<size_t>(binding_count, 1), VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER);
+            out.sampler_layout = CreateWrappedDescriptorSetLayout(
+                device, sampler_types, VK_SHADER_STAGE_VERTEX_BIT | VK_SHADER_STAGE_FRAGMENT_BIT);
+
+            const std::array set_layouts{*effect.uniform_layout, *out.sampler_layout};
+            out.pipeline_layout =
+                device.GetLogical().CreatePipelineLayout(VkPipelineLayoutCreateInfo{
+                    .sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO,
+                    .pNext = nullptr,
+                    .flags = 0,
+                    .setLayoutCount = static_cast<u32>(set_layouts.size()),
+                    .pSetLayouts = set_layouts.data(),
+                    .pushConstantRangeCount = 0,
+                    .pPushConstantRanges = nullptr,
+                });
+
+            const auto vertex_shader = effect.shaders.find(pass.vs_entry_point);
+            const auto fragment_shader = effect.shaders.find(pass.ps_entry_point);
+            if (vertex_shader == effect.shaders.end() ||
+                fragment_shader == effect.shaders.end()) {
+                LOG_WARNING(Render_Vulkan, "Effect '{}' pass references a missing entry point",
+                            entry.file);
+                continue;
+            }
+
+            out.renderpass = CreateFxRenderPass(device, target_format, out.clear);
+            out.pipeline = CreateFxPipeline(device, out.renderpass, out.pipeline_layout,
+                                            *vertex_shader->second, *fragment_shader->second, pass);
+
+            if (out.writes_backbuffer) {
+                out.backbuffer_slot = static_cast<u32>(effect.backbuffer_pass_count % 2);
+                ++effect.backbuffer_pass_count;
+                for (u32 image = 0; image < m_image_count; ++image) {
+                    for (size_t slot = 0; slot < 2; ++slot) {
+                        out.framebuffers.push_back(CreateWrappedFramebuffer(
+                            device, out.renderpass, m_frames[image].views[slot], out.extent));
+                    }
+                }
+            } else {
+                out.framebuffers.push_back(
+                    CreateWrappedFramebuffer(device, out.renderpass,
+                                             effect.textures[out.target_texture].view, out.extent));
+            }
+
+            effect.passes.push_back(std::move(out));
+        }
+
+        if (effect.passes.empty()) {
+            LOG_WARNING(Render_Vulkan, "Effect '{}' technique '{}' has no passes", entry.file,
+                        entry.technique);
+            continue;
+        }
+
+        const u32 buffer_size = std::max<u32>(effect.uniform_size, 4);
+        for (u32 i = 0; i < m_image_count; ++i) {
+            effect.uniform_buffers.push_back(
+                CreateWrappedBuffer(allocator, buffer_size, MemoryUsage::Upload));
+        }
+
+        size_t sampler_descriptor_count = 0;
+        size_t sampler_set_count = 0;
+        for (const auto& pass : effect.passes) {
+            sampler_descriptor_count +=
+                m_image_count * std::max<size_t>(pass.sampler_bindings.size(), 1);
+            sampler_set_count += m_image_count;
+        }
+
+        effect.descriptor_pool = CreateWrappedDescriptorPool(
+            device, m_image_count + sampler_descriptor_count, m_image_count + sampler_set_count,
+            {VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER});
+
+        const std::vector<VkDescriptorSetLayout> uniform_layouts(m_image_count,
+                                                                 *effect.uniform_layout);
+        effect.uniform_sets = CreateWrappedDescriptorSets(effect.descriptor_pool, uniform_layouts);
+
+        for (auto& pass : effect.passes) {
+            const std::vector<VkDescriptorSetLayout> layouts(m_image_count, *pass.sampler_layout);
+            pass.sampler_sets = CreateWrappedDescriptorSets(effect.descriptor_pool, layouts);
+        }
+
+        m_effects.push_back(std::move(effect));
+    }
+
+    return true;
+}
+
+void PostProcessChain::PrepareImages(const Device& device, Scheduler& scheduler) {
+    if (m_images_ready) {
+        return;
+    }
+
+    scheduler.Record([this](vk::CommandBuffer cmdbuf) {
+        ClearColorImage(cmdbuf, *m_fallback_image);
+        for (auto& frame : m_frames) {
+            for (auto& image : frame.images) {
+                ClearColorImage(cmdbuf, *image);
+            }
+        }
+        for (auto& effect : m_effects) {
+            for (auto& texture : effect.textures) {
+                if (texture.image) {
+                    ClearColorImage(cmdbuf, *texture.image);
+                }
+            }
+        }
+    });
+    scheduler.Finish();
+
+    m_images_ready = true;
+}
+
+void PostProcessChain::UpdateUniforms(Effect& effect, size_t image_index, f32 delta_seconds) {
+    if (effect.uniform_size == 0) {
+        return;
+    }
+
+    static thread_local std::mt19937 rng{std::random_device{}()};
+
+    std::vector<u8> staging(effect.uniform_size, 0);
+    const f32 elapsed =
+        std::chrono::duration<f32>(std::chrono::steady_clock::now() - m_start).count();
+
+    for (auto& uniform : effect.uniforms) {
+        std::array<f32, 4> value = uniform.fallback;
+
+        switch (uniform.source) {
+        case UniformSource::FrameTime:
+            value[0] = delta_seconds * 1000.0f;
+            break;
+        case UniformSource::FrameCount:
+            value[0] = static_cast<f32>(m_frame_count);
+            break;
+        case UniformSource::Timer:
+            value[0] = elapsed * 1000.0f;
+            break;
+        case UniformSource::Random: {
+            const int low = static_cast<int>(uniform.args[0]);
+            int high = static_cast<int>(uniform.args[1]);
+            if (high <= low) {
+                high = low + 1;
+            }
+            std::uniform_int_distribution<int> dist(low, high);
+            value[0] = static_cast<f32>(dist(rng));
+            break;
+        }
+        case UniformSource::PingPong: {
+            const f32 min_value = uniform.args[0];
+            f32 max_value = uniform.args[1];
+            if (max_value <= min_value) {
+                max_value = min_value + 1.0f;
+            }
+            f32 step = uniform.args[2];
+            if (step == 0.0f) {
+                step = 1.0f;
+            }
+            uniform.state += uniform.direction * step * delta_seconds;
+            if (uniform.state >= max_value) {
+                uniform.state = max_value;
+                uniform.direction = -1.0f;
+            }
+            if (uniform.state <= min_value) {
+                uniform.state = min_value;
+                uniform.direction = 1.0f;
+            }
+            value[0] = uniform.state;
+            value[1] = uniform.direction;
+            break;
+        }
+        case UniformSource::Value:
+        default:
+            break;
+        }
+
+        for (u32 i = 0; i < uniform.components; ++i) {
+            const size_t offset = uniform.offset + i * sizeof(u32);
+            if (offset + sizeof(u32) > staging.size()) {
+                break;
+            }
+            if (uniform.kind == UniformKind::Floating) {
+                const f32 element = value[i];
+                std::memcpy(staging.data() + offset, &element, sizeof(f32));
+            } else {
+                const s32 element = static_cast<s32>(value[i]);
+                std::memcpy(staging.data() + offset, &element, sizeof(s32));
+            }
+        }
+    }
+
+    const std::span<u8> mapped = effect.uniform_buffers[image_index].Mapped();
+    if (mapped.size() >= staging.size()) {
+        std::memcpy(mapped.data(), staging.data(), staging.size());
+        effect.uniform_buffers[image_index].Flush();
+    }
+}
+
+void PostProcessChain::UpdateDescriptors(const Device& device, Effect& effect, Pass& pass,
+                                         size_t image_index, VkImageView backbuffer_view) {
+    std::vector<VkDescriptorImageInfo> image_infos;
+    std::vector<VkWriteDescriptorSet> writes;
+    image_infos.reserve(pass.sampler_bindings.size() + 1);
+
+    const VkDescriptorSet sampler_set = pass.sampler_sets[image_index];
+
+    for (const auto& binding : pass.sampler_bindings) {
+        VkImageView view = *m_fallback_view;
+        VkSampler handle = *m_fallback_sampler;
+
+        if (binding.sampler_index < effect.samplers.size()) {
+            const Sampler& sampler = effect.samplers[binding.sampler_index];
+            if (sampler.sampler) {
+                handle = *sampler.sampler;
+            }
+            if (sampler.texture_index != NO_TEXTURE) {
+                const Texture& texture = effect.textures[sampler.texture_index];
+                if (texture.is_backbuffer) {
+                    view = backbuffer_view;
+                } else if (texture.view) {
+                    view = *texture.view;
+                }
+            }
+        }
+
+        writes.push_back(
+            CreateWriteDescriptorSet(image_infos, handle, view, sampler_set, binding.binding));
+    }
+
+    const VkDescriptorBufferInfo buffer_info{
+        .buffer = *effect.uniform_buffers[image_index],
+        .offset = 0,
+        .range = VK_WHOLE_SIZE,
+    };
+
+    writes.push_back(VkWriteDescriptorSet{
+        .sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET,
+        .pNext = nullptr,
+        .dstSet = effect.uniform_sets[image_index],
+        .dstBinding = 0,
+        .dstArrayElement = 0,
+        .descriptorCount = 1,
+        .descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
+        .pImageInfo = nullptr,
+        .pBufferInfo = &buffer_info,
+        .pTexelBufferView = nullptr,
+    });
+
+    device.GetLogical().UpdateDescriptorSets(writes, {});
+}
+
+void PostProcessChain::Draw(const Device& device, Scheduler& scheduler, size_t image_index,
+                            VkImage* inout_image, VkImageView* inout_image_view) {
+    if (m_effects.empty()) {
+        return;
+    }
+
+    PrepareImages(device, scheduler);
+
+    const auto now = std::chrono::steady_clock::now();
+    const f32 delta_seconds = std::chrono::duration<f32>(now - m_previous).count();
+    m_previous = now;
+    ++m_frame_count;
+
+    FrameImages& frame = m_frames[image_index];
+    VkImage current_image = *inout_image;
+    VkImageView current_view = *inout_image_view;
+    u32 slot = 0;
+
+    for (auto& effect : m_effects) {
+        UpdateUniforms(effect, image_index, delta_seconds);
+
+        for (size_t pass_index = 0; pass_index < effect.passes.size(); ++pass_index) {
+            Pass& pass = effect.passes[pass_index];
+
+            UpdateDescriptors(device, effect, pass, image_index, current_view);
+
+            VkFramebuffer framebuffer{};
+            VkImage target_image{};
+            if (pass.writes_backbuffer) {
+                const u32 target_slot = (slot + 1) % 2;
+                framebuffer = *pass.framebuffers[image_index * 2 + target_slot];
+                target_image = *frame.images[target_slot];
+            } else {
+                framebuffer = *pass.framebuffers[0];
+                target_image = *effect.textures[pass.target_texture].image;
+            }
+
+            const VkImage source_image = current_image;
+            const VkRenderPass renderpass = *pass.renderpass;
+            const VkPipeline pipeline = *pass.pipeline;
+            const VkPipelineLayout layout = *pass.pipeline_layout;
+            const VkDescriptorSet uniform_set = effect.uniform_sets[image_index];
+            const VkDescriptorSet sampler_set = pass.sampler_sets[image_index];
+            const VkExtent2D extent = pass.extent;
+            const u32 vertices = pass.num_vertices;
+
+            scheduler.RequestOutsideRenderPassOperationContext();
+            scheduler.Record([=](vk::CommandBuffer cmdbuf) {
+                TransitionImageLayout(cmdbuf, source_image, VK_IMAGE_LAYOUT_GENERAL);
+                TransitionImageLayout(cmdbuf, target_image, VK_IMAGE_LAYOUT_GENERAL);
+                BeginRenderPass(cmdbuf, renderpass, framebuffer, extent);
+                cmdbuf.BindPipeline(VK_PIPELINE_BIND_POINT_GRAPHICS, pipeline);
+                cmdbuf.BindDescriptorSets(VK_PIPELINE_BIND_POINT_GRAPHICS, layout, 0,
+                                          std::array{uniform_set, sampler_set}, {});
+                cmdbuf.Draw(vertices, 1, 0, 0);
+                cmdbuf.EndRenderPass();
+                TransitionImageLayout(cmdbuf, target_image, VK_IMAGE_LAYOUT_GENERAL);
+            });
+
+            if (pass.writes_backbuffer) {
+                slot = (slot + 1) % 2;
+                current_image = *frame.images[slot];
+                current_view = *frame.views[slot];
+            }
+        }
+    }
+
+    *inout_image = current_image;
+    *inout_image_view = current_view;
+}
+
+} // namespace Vulkan

src/video_core/renderer_vulkan/present/post_process.h

@@ -0,0 +1,140 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <array>
+#include <chrono>
+#include <map>
+#include <string>
+#include <vector>
+
+#include "common/common_types.h"
+#include "video_core/vulkan_common/vulkan_memory_allocator.h"
+#include "video_core/vulkan_common/vulkan_wrapper.h"
+
+namespace Vulkan {
+
+class Device;
+class Scheduler;
+
+class PostProcessChain {
+public:
+    explicit PostProcessChain(const Device& device, MemoryAllocator& allocator, Scheduler& scheduler,
+                              size_t image_count, VkExtent2D extent);
+    ~PostProcessChain();
+
+    void Draw(const Device& device, Scheduler& scheduler, size_t image_index, VkImage* inout_image,
+              VkImageView* inout_image_view);
+
+    bool Empty() const;
+
+private:
+    enum class UniformKind : u32 {
+        Boolean,
+        Integer,
+        Floating,
+    };
+
+    enum class UniformSource : u32 {
+        Value,
+        FrameTime,
+        FrameCount,
+        Timer,
+        Random,
+        PingPong,
+    };
+
+    struct UniformWrite {
+        std::string name;
+        u32 offset{};
+        u32 components{};
+        UniformKind kind{UniformKind::Floating};
+        UniformSource source{UniformSource::Value};
+        std::array<f32, 4> fallback{};
+        std::array<f32, 4> args{};
+        f32 state{};
+        f32 direction{1.0f};
+    };
+
+    struct Texture {
+        std::string name;
+        vk::Image image{};
+        vk::ImageView view{};
+        VkExtent2D extent{};
+        VkFormat format{};
+        bool is_backbuffer{};
+    };
+
+    struct Sampler {
+        vk::Sampler sampler{};
+        size_t texture_index{};
+    };
+
+    struct SamplerBinding {
+        u32 binding{};
+        size_t sampler_index{};
+    };
+
+    struct Pass {
+        vk::RenderPass renderpass{};
+        vk::Pipeline pipeline{};
+        vk::DescriptorSetLayout sampler_layout{};
+        vk::PipelineLayout pipeline_layout{};
+        vk::DescriptorSets sampler_sets{};
+        std::vector<SamplerBinding> sampler_bindings{};
+        std::vector<vk::Framebuffer> framebuffers{};
+        size_t target_texture{};
+        VkExtent2D extent{};
+        u32 num_vertices{3};
+        bool clear{};
+        bool writes_backbuffer{};
+        u32 backbuffer_slot{};
+    };
+
+    struct Effect {
+        size_t entry_index{};
+        std::string file{};
+        std::map<std::string, vk::ShaderModule> shaders{};
+        std::vector<Texture> textures{};
+        std::vector<Sampler> samplers{};
+        std::vector<Pass> passes{};
+        std::vector<UniformWrite> uniforms{};
+        u32 uniform_size{};
+        std::vector<vk::Buffer> uniform_buffers{};
+        vk::DescriptorSetLayout uniform_layout{};
+        vk::DescriptorPool descriptor_pool{};
+        vk::DescriptorSets uniform_sets{};
+        size_t backbuffer_pass_count{};
+        u32 backbuffer_slots{1};
+    };
+
+    struct FrameImages {
+        std::array<vk::Image, 2> images{};
+        std::array<vk::ImageView, 2> views{};
+    };
+
+    bool BuildEffects(const Device& device, MemoryAllocator& allocator, Scheduler& scheduler);
+    void CreatePingPongImages(const Device& device, MemoryAllocator& allocator);
+    void PrepareImages(const Device& device, Scheduler& scheduler);
+    void UpdateUniforms(Effect& effect, size_t image_index, f32 delta_seconds);
+    void UpdateDescriptors(const Device& device, Effect& effect, Pass& pass, size_t image_index,
+                           VkImageView backbuffer_view);
+
+    const VkExtent2D m_extent;
+    const u32 m_image_count;
+
+    std::vector<Effect> m_effects{};
+    std::vector<FrameImages> m_frames{};
+
+    vk::Sampler m_fallback_sampler{};
+    vk::Image m_fallback_image{};
+    vk::ImageView m_fallback_view{};
+
+    std::chrono::steady_clock::time_point m_start{};
+    std::chrono::steady_clock::time_point m_previous{};
+    u64 m_frame_count{};
+    bool m_images_ready{};
+};
+
+} // namespace Vulkan

src/video_core/renderer_vulkan/renderer_vulkan.cpp

@@ -24,6 +24,10 @@
 #include "video_core/gpu.h"
 #include "video_core/present.h"
 #include "video_core/renderer_vulkan/present/util.h"
+#ifdef HAS_RESHADE
+#include "video_core/post_processing/fx_chain.h"
+#include "video_core/post_processing/fx_effect.h"
+#endif
 #include "video_core/renderer_vulkan/renderer_vulkan.h"
 #include "video_core/renderer_vulkan/vk_blit_screen.h"
 #include "video_core/renderer_vulkan/vk_rasterizer.h"
@@ -183,6 +187,12 @@ try
         scheduler.RegisterOnSubmit([this] { turbo_mode->QueueSubmitted(); });
     }
 
+#ifdef HAS_RESHADE
+    VideoCore::ReloadFxCatalog();
+    VideoCore::FxChain::Instance().LoadFromSettings();
+    VideoCore::FxChain::Instance().DropUnknownEntries();
+#endif
+
     Report();
 } catch (const vk::Exception& exception) {
     LOG_ERROR(Render_Vulkan, "Vulkan initialization failed with error: {}", exception.what());

src/yuzu/CMakeLists.txt

@@ -250,6 +250,12 @@ if (YUZU_CRASH_DUMPS)
     target_compile_definitions(yuzu PRIVATE YUZU_CRASH_DUMPS)
 endif()
 
+if (ENABLE_RESHADE)
+    target_sources(yuzu PRIVATE
+        configuration/configure_post_processing.cpp
+        configuration/configure_post_processing.h)
+endif()
+
 if (CXX_CLANG)
     target_compile_definitions(yuzu PRIVATE
         $<$<VERSION_LESS:$<CXX_COMPILER_VERSION>,15>:CANNOT_EXPLICITLY_INSTANTIATE>)

src/yuzu/configuration/configure_post_processing.cpp

@@ -0,0 +1,378 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <array>
+#include <cmath>
+#include <string>
+
+#include <QCheckBox>
+#include <QComboBox>
+#include <QDesktopServices>
+#include <QDialogButtonBox>
+#include <QGridLayout>
+#include <QGroupBox>
+#include <QHBoxLayout>
+#include <QLabel>
+#include <QPushButton>
+#include <QScrollArea>
+#include <QSlider>
+#include <QToolButton>
+#include <QUrl>
+#include <QVBoxLayout>
+
+#include "common/fs/fs.h"
+#include "common/fs/fs_util.h"
+#include "video_core/post_processing/fx_chain.h"
+#include "video_core/post_processing/fx_effect.h"
+#include "yuzu/configuration/configure_post_processing.h"
+
+namespace {
+
+std::array<float, 4> CurrentValue(int index, const VideoCore::FxUniformDesc& uniform) {
+    auto& chain = VideoCore::FxChain::Instance();
+    if (chain.HasValue(static_cast<size_t>(index), uniform.name)) {
+        return chain.GetValue(static_cast<size_t>(index), uniform.name);
+    }
+    return uniform.default_value;
+}
+
+int SliderSteps(const VideoCore::FxUniformDesc& uniform) {
+    const float span = uniform.ui_max - uniform.ui_min;
+    const int steps = static_cast<int>(std::lround(span / uniform.ui_step));
+    if (steps < 1) {
+        return 1;
+    }
+    return steps;
+}
+
+QString FormatValue(const VideoCore::FxUniformDesc& uniform, float value) {
+    if (uniform.kind == VideoCore::FxUniformKind::Floating) {
+        return QString::number(value, 'f', 3);
+    }
+    return QString::number(static_cast<int>(std::lround(value)));
+}
+
+QString SlotLabel(const VideoCore::FxEffectDesc& effect, const std::string& technique) {
+    const QString name = QString::fromStdString(effect.name);
+    if (effect.techniques.size() == 1) {
+        return name;
+    }
+    return name + QStringLiteral(" · ") + QString::fromStdString(technique);
+}
+
+} // Anonymous namespace
+
+ConfigurePostProcessing::ConfigurePostProcessing(QWidget* parent) : QDialog(parent) {
+    setWindowTitle(tr("Post-Processing Effects"));
+    setMinimumWidth(560);
+    setMinimumHeight(460);
+
+    auto* root = new QVBoxLayout(this);
+
+    auto* description = new QLabel(
+        tr("ReShade FX effects are loaded from the post_shaders folder in the Eden data "
+           "directory. Changes apply immediately while a game is running."),
+        this);
+    description->setWordWrap(true);
+    root->addWidget(description);
+
+    auto* scroll = new QScrollArea(this);
+    scroll->setWidgetResizable(true);
+    slots_container = new QWidget(scroll);
+    slots_layout = new QVBoxLayout(slots_container);
+    slots_layout->setAlignment(Qt::AlignTop);
+    scroll->setWidget(slots_container);
+    root->addWidget(scroll, 1);
+
+    auto* actions = new QHBoxLayout();
+
+    auto* add_button = new QPushButton(tr("Add Effect"), this);
+    connect(add_button, &QPushButton::clicked, this, [this]() {
+        for (const auto& effect : VideoCore::GetFxCatalog()) {
+            if (!effect.Valid()) {
+                continue;
+            }
+            VideoCore::FxChain::Instance().Append(effect.file, effect.techniques.front());
+            ApplyStructuralChange();
+            return;
+        }
+    });
+    actions->addWidget(add_button);
+
+    auto* reload_button = new QPushButton(tr("Reload From Disk"), this);
+    connect(reload_button, &QPushButton::clicked, this, [this]() {
+        VideoCore::ReloadFxCatalog();
+        VideoCore::FxChain::Instance().DropUnknownEntries();
+        ApplyStructuralChange();
+    });
+    actions->addWidget(reload_button);
+
+    auto* open_button = new QPushButton(tr("Open Folder"), this);
+    connect(open_button, &QPushButton::clicked, this, []() {
+        const auto path = VideoCore::GetFxRootDirectory();
+        void(Common::FS::CreateDirs(path));
+        QDesktopServices::openUrl(
+            QUrl::fromLocalFile(QString::fromStdString(Common::FS::PathToUTF8String(path))));
+    });
+    actions->addWidget(open_button);
+
+    actions->addStretch();
+    root->addLayout(actions);
+
+    auto* buttons = new QDialogButtonBox(QDialogButtonBox::Close, this);
+    connect(buttons, &QDialogButtonBox::rejected, this, &QDialog::close);
+    root->addWidget(buttons);
+
+    RebuildRows();
+}
+
+ConfigurePostProcessing::~ConfigurePostProcessing() = default;
+
+void ConfigurePostProcessing::ApplyStructuralChange() {
+    VideoCore::FxChain::Instance().StoreToSettings();
+    RebuildRows();
+}
+
+void ConfigurePostProcessing::PopulateEffectCombo(QComboBox* combo,
+                                                  const VideoCore::FxChainEntry& entry) const {
+    combo->clear();
+    int selected = -1;
+
+    for (const auto& effect : VideoCore::GetFxCatalog()) {
+        if (!effect.Valid()) {
+            continue;
+        }
+        for (const auto& technique : effect.techniques) {
+            const QString key = QString::fromStdString(effect.file + "|" + technique);
+            combo->addItem(SlotLabel(effect, technique), key);
+            if (effect.file == entry.file && technique == entry.technique) {
+                selected = combo->count() - 1;
+            }
+        }
+    }
+
+    if (selected >= 0) {
+        combo->setCurrentIndex(selected);
+    }
+}
+
+void ConfigurePostProcessing::BuildUniformWidget(QWidget* parent, QVBoxLayout* layout, int index,
+                                                 const VideoCore::FxUniformDesc& uniform) {
+    const auto value = CurrentValue(index, uniform);
+    const QString label = QString::fromStdString(uniform.label);
+
+    if (uniform.ui_type == VideoCore::FxUiType::CheckBox) {
+        auto* box = new QCheckBox(label, parent);
+        box->setChecked(value[0] != 0.0f);
+        if (!uniform.tooltip.empty()) {
+            box->setToolTip(QString::fromStdString(uniform.tooltip));
+        }
+        const std::string name = uniform.name;
+        connect(box, &QCheckBox::toggled, this, [index, name](bool checked) {
+            std::array<float, 4> next{};
+            if (checked) {
+                next[0] = 1.0f;
+            }
+            VideoCore::FxChain::Instance().SetValue(static_cast<size_t>(index), name, next);
+            VideoCore::FxChain::Instance().StoreToSettings();
+        });
+        layout->addWidget(box);
+        return;
+    }
+
+    if (uniform.ui_type == VideoCore::FxUiType::Combo ||
+        uniform.ui_type == VideoCore::FxUiType::Radio) {
+        auto* row = new QHBoxLayout();
+        row->addWidget(new QLabel(label, parent));
+        auto* combo = new QComboBox(parent);
+        for (size_t i = 0; i < uniform.items.size(); ++i) {
+            combo->addItem(QString::fromStdString(uniform.items[i]), static_cast<int>(i));
+        }
+        if (combo->count() == 0) {
+            combo->addItem(tr("Enabled"), 1);
+            combo->addItem(tr("Disabled"), 0);
+        }
+        const int current = static_cast<int>(std::lround(value[0]));
+        if (current >= 0 && current < combo->count()) {
+            combo->setCurrentIndex(current);
+        }
+        if (!uniform.tooltip.empty()) {
+            combo->setToolTip(QString::fromStdString(uniform.tooltip));
+        }
+        const std::string name = uniform.name;
+        connect(combo, &QComboBox::currentIndexChanged, this, [index, name](int selected) {
+            std::array<float, 4> next{};
+            next[0] = static_cast<float>(selected);
+            VideoCore::FxChain::Instance().SetValue(static_cast<size_t>(index), name, next);
+            VideoCore::FxChain::Instance().StoreToSettings();
+        });
+        row->addWidget(combo, 1);
+        layout->addLayout(row);
+        return;
+    }
+
+    auto* grid = new QGridLayout();
+    for (unsigned component = 0; component < uniform.components; ++component) {
+        QString component_label = label;
+        if (uniform.components > 1) {
+            component_label = label + QStringLiteral(" [%1]").arg(component);
+        }
+
+        auto* name_label = new QLabel(component_label, parent);
+        auto* value_label = new QLabel(parent);
+        value_label->setMinimumWidth(64);
+        value_label->setAlignment(Qt::AlignRight | Qt::AlignVCenter);
+        value_label->setText(FormatValue(uniform, value[component]));
+
+        auto* slider = new QSlider(Qt::Horizontal, parent);
+        slider->setMinimum(0);
+        slider->setMaximum(SliderSteps(uniform));
+        slider->setValue(
+            static_cast<int>(std::lround((value[component] - uniform.ui_min) / uniform.ui_step)));
+        if (!uniform.tooltip.empty()) {
+            slider->setToolTip(QString::fromStdString(uniform.tooltip));
+        }
+
+        const std::string name = uniform.name;
+        const auto desc = uniform;
+        connect(slider, &QSlider::valueChanged, this,
+                [index, name, desc, component, value_label](int steps) {
+                    auto next = CurrentValue(index, desc);
+                    next[component] = desc.ui_min + static_cast<float>(steps) * desc.ui_step;
+                    VideoCore::FxChain::Instance().SetValue(static_cast<size_t>(index), name, next);
+                    value_label->setText(FormatValue(desc, next[component]));
+                });
+        connect(slider, &QSlider::sliderReleased, this,
+                []() { VideoCore::FxChain::Instance().StoreToSettings(); });
+
+        grid->addWidget(name_label, static_cast<int>(component), 0);
+        grid->addWidget(slider, static_cast<int>(component), 1);
+        grid->addWidget(value_label, static_cast<int>(component), 2);
+    }
+    layout->addLayout(grid);
+}
+
+QWidget* ConfigurePostProcessing::BuildSlot(int index, const VideoCore::FxChainEntry& entry) {
+    auto* group = new QGroupBox(slots_container);
+    auto* layout = new QVBoxLayout(group);
+
+    auto* header = new QHBoxLayout();
+
+    auto* combo = new QComboBox(group);
+    PopulateEffectCombo(combo, entry);
+    connect(combo, &QComboBox::currentIndexChanged, this, [this, index, combo](int) {
+        const QString key = combo->currentData().toString();
+        const qsizetype separator = key.indexOf(QLatin1Char('|'));
+        if (separator < 0) {
+            return;
+        }
+        VideoCore::FxChain::Instance().Replace(static_cast<size_t>(index),
+                                               key.left(separator).toStdString(),
+                                               key.mid(separator + 1).toStdString());
+        ApplyStructuralChange();
+    });
+    header->addWidget(combo, 1);
+
+    auto* up_button = new QToolButton(group);
+    up_button->setText(QStringLiteral("▲"));
+    up_button->setEnabled(index > 0);
+    connect(up_button, &QToolButton::clicked, this, [this, index]() {
+        VideoCore::FxChain::Instance().Move(static_cast<size_t>(index), -1);
+        ApplyStructuralChange();
+    });
+    header->addWidget(up_button);
+
+    auto* down_button = new QToolButton(group);
+    down_button->setText(QStringLiteral("▼"));
+    down_button->setEnabled(static_cast<size_t>(index) + 1 < VideoCore::FxChain::Instance().Size());
+    connect(down_button, &QToolButton::clicked, this, [this, index]() {
+        VideoCore::FxChain::Instance().Move(static_cast<size_t>(index), 1);
+        ApplyStructuralChange();
+    });
+    header->addWidget(down_button);
+
+    auto* reset_button = new QToolButton(group);
+    reset_button->setText(QStringLiteral("⟲"));
+    reset_button->setToolTip(tr("Reset to defaults"));
+    connect(reset_button, &QToolButton::clicked, this, [this, index]() {
+        VideoCore::FxChain::Instance().ResetValues(static_cast<size_t>(index));
+        ApplyStructuralChange();
+    });
+    header->addWidget(reset_button);
+
+    auto* remove_button = new QToolButton(group);
+    remove_button->setText(QStringLiteral("✕"));
+    connect(remove_button, &QToolButton::clicked, this, [this, index]() {
+        VideoCore::FxChain::Instance().Remove(static_cast<size_t>(index));
+        ApplyStructuralChange();
+    });
+    header->addWidget(remove_button);
+
+    layout->addLayout(header);
+
+    const VideoCore::FxEffectDesc* effect = VideoCore::FindFxEffect(entry.file);
+    if (effect == nullptr) {
+        auto* missing =
+            new QLabel(tr("Effect '%1' was not found.").arg(QString::fromStdString(entry.file)),
+                       group);
+        missing->setWordWrap(true);
+        layout->addWidget(missing);
+        return group;
+    }
+
+    if (!effect->error.empty()) {
+        auto* failed = new QLabel(
+            tr("Effect failed to compile:\n%1").arg(QString::fromStdString(effect->error)), group);
+        failed->setWordWrap(true);
+        layout->addWidget(failed);
+        return group;
+    }
+
+    std::string current_category;
+    for (const auto& uniform : effect->uniforms) {
+        if (uniform.category != current_category) {
+            current_category = uniform.category;
+            if (!current_category.empty()) {
+                auto* category = new QLabel(QString::fromStdString(current_category), group);
+                category->setStyleSheet(QStringLiteral("font-weight: bold;"));
+                layout->addWidget(category);
+            }
+        }
+        BuildUniformWidget(group, layout, index, uniform);
+    }
+
+    return group;
+}
+
+void ConfigurePostProcessing::RebuildRows() {
+    QLayoutItem* item = nullptr;
+    while ((item = slots_layout->takeAt(0)) != nullptr) {
+        if (item->widget() != nullptr) {
+            item->widget()->deleteLater();
+        }
+        delete item;
+    }
+
+    bool has_usable = false;
+    for (const auto& effect : VideoCore::GetFxCatalog()) {
+        if (effect.Valid()) {
+            has_usable = true;
+            break;
+        }
+    }
+
+    if (!has_usable) {
+        auto* empty = new QLabel(
+            tr("No usable ReShade FX effects were found. Place .fx files in the post_shaders "
+               "folder."),
+            slots_container);
+        empty->setWordWrap(true);
+        slots_layout->addWidget(empty);
+        return;
+    }
+
+    const auto entries = VideoCore::FxChain::Instance().Entries();
+    for (size_t i = 0; i < entries.size(); ++i) {
+        slots_layout->addWidget(BuildSlot(static_cast<int>(i), entries[i]));
+    }
+}

src/yuzu/configuration/configure_post_processing.h

@@ -0,0 +1,35 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <QDialog>
+
+class QComboBox;
+class QVBoxLayout;
+class QWidget;
+
+namespace VideoCore {
+struct FxChainEntry;
+struct FxEffectDesc;
+struct FxUniformDesc;
+}
+
+class ConfigurePostProcessing : public QDialog {
+    Q_OBJECT
+
+public:
+    explicit ConfigurePostProcessing(QWidget* parent = nullptr);
+    ~ConfigurePostProcessing() override;
+
+private:
+    void RebuildRows();
+    QWidget* BuildSlot(int index, const VideoCore::FxChainEntry& entry);
+    void BuildUniformWidget(QWidget* parent, QVBoxLayout* layout, int index,
+                            const VideoCore::FxUniformDesc& uniform);
+    void PopulateEffectCombo(QComboBox* combo, const VideoCore::FxChainEntry& entry) const;
+    void ApplyStructuralChange();
+
+    QVBoxLayout* slots_layout{};
+    QWidget* slots_container{};
+};

src/yuzu/main.ui

@@ -148,6 +148,7 @@
     <addaction name="action_Show_Filter_Bar"/>
     <addaction name="action_Show_Status_Bar"/>
     <addaction name="action_Show_Performance_Overlay"/>
+    <addaction name="action_Post_Processing_Shaders"/>
     <addaction name="separator"/>
     <addaction name="menu_Reset_Window_Size"/>
     <addaction name="menu_View_Debugging"/>
@@ -610,6 +611,11 @@
     <string>Show &amp;Performance Overlay</string>
    </property>
   </action>
+  <action name="action_Post_Processing_Shaders">
+   <property name="text">
+    <string>Post-Processing &amp;Shaders...</string>
+   </property>
+  </action>
   <action name="action_Carousel_View">
    <property name="checkable">
     <bool>true</bool>

src/yuzu/main_window.cpp

@@ -13,6 +13,9 @@
 #include "common/settings_enums.h"
 #include "frontend_common/settings_generator.h"
 #include "render/performance_overlay.h"
+#ifdef HAS_RESHADE
+#include "configuration/configure_post_processing.h"
+#endif
 #include "updater/update_dialog.h"
 
 #include "common/fs/ryujinx_compat.h"
@@ -1518,6 +1521,11 @@ void MainWindow::ConnectMenuEvents() {
     connect_menu(ui->action_Show_Filter_Bar, &MainWindow::OnToggleFilterBar);
     connect_menu(ui->action_Show_Status_Bar, &MainWindow::OnToggleStatusBar);
     connect_menu(ui->action_Show_Performance_Overlay, &MainWindow::OnTogglePerfOverlay);
+#ifdef HAS_RESHADE
+    connect_menu(ui->action_Post_Processing_Shaders, &MainWindow::OnPostProcessingShaders);
+#else
+    ui->action_Post_Processing_Shaders->setVisible(false);
+#endif
 
     connect_menu(ui->action_Reset_Window_Size_720, &MainWindow::ResetWindowSize720);
     connect_menu(ui->action_Reset_Window_Size_900, &MainWindow::ResetWindowSize900);
@@ -3900,6 +3908,22 @@ void MainWindow::OnTogglePerfOverlay() {
         perf_overlay->setVisible(ui->action_Show_Performance_Overlay->isChecked());
 }
 
+#ifdef HAS_RESHADE
+void MainWindow::OnPostProcessingShaders() {
+    if (post_processing_dialog == nullptr) {
+        post_processing_dialog = new ConfigurePostProcessing(this);
+        connect(post_processing_dialog, &QDialog::finished, post_processing_dialog, [this]() {
+            post_processing_dialog->deleteLater();
+            post_processing_dialog = nullptr;
+        });
+    }
+
+    post_processing_dialog->show();
+    post_processing_dialog->raise();
+    post_processing_dialog->activateWindow();
+}
+#endif
+
 void MainWindow::OnGameListRefresh() {
     // Resets metadata cache and reloads
     QtCommon::Game::ResetMetadata(false);

src/yuzu/main_window.h

@@ -56,6 +56,9 @@ class QSlider;
 class QHBoxLayout;
 class WaitTreeWidget;
 class PerformanceOverlay;
+#ifdef HAS_RESHADE
+class ConfigurePostProcessing;
+#endif
 enum class GameListOpenTarget;
 enum class DumpRomFSTarget;
 class GameListPlaceholder;
@@ -392,6 +395,9 @@ private slots:
     void OnToggleFilterBar();
     void OnToggleStatusBar();
     void OnTogglePerfOverlay();
+#ifdef HAS_RESHADE
+    void OnPostProcessingShaders();
+#endif
     void OnGameListRefresh();
     void InitializeHotkeys();
     void ToggleFullscreen();
@@ -496,6 +502,9 @@ private:
     QTimer shutdown_timer;
     OverlayDialog* shutdown_dialog{};
     PerformanceOverlay* perf_overlay = nullptr;
+#ifdef HAS_RESHADE
+    ConfigurePostProcessing* post_processing_dialog = nullptr;
+#endif
 
     GameListPlaceholder* game_list_placeholder = nullptr;