[GPU] Added flush helper to detect when FlusRegion must be flushed

src/core/memory.cpp

@@ -754,7 +754,7 @@ struct Memory::Impl {
         };
         auto& gpu = system.GPU();
         gpu_device_memory->ApplyOpOnPointer(p, scratch_buffers[core], [&](DAddr addr) {
-            if (flush) {
+            if (flush && gpu.MustFlushRegion(addr, size)) {
                 void(gpu.OnCPURead(addr, size));
             }
             gpu.InvalidateRegion(addr, size);

src/video_core/gpu.cpp

@@ -219,6 +219,10 @@ struct GPU::Impl {
         return renderer->ReadRasterizer()->OnCPUWrite(addr, size);
     }
 
+    bool MustFlushRegion(DAddr addr, u64 size) {
+        return renderer->ReadRasterizer()->MustFlushRegion(addr, size);
+    }
+
     /// Notify rasterizer that any caches of the specified region should be flushed and invalidated
     void FlushAndInvalidateRegion(DAddr addr, u64 size) {
         gpu_thread.FlushAndInvalidateRegion(addr, size, is_async);
@@ -480,6 +484,10 @@ void GPU::InvalidateRegion(DAddr addr, u64 size) {
     impl->InvalidateRegion(addr, size);
 }
 
+bool GPU::MustFlushRegion(DAddr addr, u64 size) {
+    return impl->MustFlushRegion(addr, size);
+}
+
 bool GPU::OnCPUWrite(DAddr addr, u64 size) {
     return impl->OnCPUWrite(addr, size);
 }

src/video_core/gpu.h

@@ -246,6 +246,9 @@ public:
     /// Notify rasterizer that any caches of the specified region should be invalidated
     void InvalidateRegion(DAddr addr, u64 size);
 
+    /// Check if the specified memory area requires flushing to CPU memory
+    [[nodiscard]] bool MustFlushRegion(DAddr addr, u64 size);
+
     /// Notify rasterizer that CPU is trying to write this area. It returns true if the area is
     /// sensible, false otherwise, addr and size must be a valid combination
     bool OnCPUWrite(DAddr addr, u64 size);