proper placement of clip distance init

Signed-off-by: swurl <swurl@swurl.xyz>

src/shader_recompiler/backend/spirv/emit_spirv_special.cpp

@@ -108,7 +108,17 @@ void EmitPrologue(EmitContext& ctx) {
                 ctx.OpStore(element_info.id, value);
                 element += num;
             }
-        }        
+        }
+
+        if (Sirit::ValidId(ctx.clip_distances)) {
+            for (u32 i = 0; i < ctx.profile.max_user_clip_distances; ++i) {
+                if (!clip_distance_written.test(i)) {
+                    const Id idx = ctx.Const(i);
+                    const Id element = ctx.OpAccessChain(ctx.output_f32, ctx.clip_distances, idx);
+                    ctx.OpStore(element, ctx.Const(0.0f));
+                }
+            }
+        }
     }
     if (ctx.stage == Stage::VertexB || ctx.stage == Stage::Geometry) {
         SetFixedPipelinePointSize(ctx);