[d3d9] Use new flat shading state for fixed-function pipelines

src/d3d9/d3d9_device.cpp

@@ -2098,9 +2098,7 @@ namespace dxvk {
           break;
 
         case D3DRS_SHADEMODE:
-          m_flags.set(
-            D3D9DeviceFlag::DirtyFFPixelShader,
-            D3D9DeviceFlag::DirtyRasterizerState);
+          m_flags.set(D3D9DeviceFlag::DirtyRasterizerState);
           break;
 
         case D3DRS_TWEENFACTOR:
@@ -6653,7 +6651,6 @@ namespace dxvk {
       }
 
       stage0.GlobalSpecularEnable = m_state.renderStates[D3DRS_SPECULARENABLE];
-      stage0.GlobalFlatShade      = m_state.renderStates[D3DRS_SHADEMODE] == D3DSHADE_FLAT;
 
       // The last stage *always* writes to current.
       if (idx >= 1)

src/d3d9/d3d9_fixed_function.cpp

@@ -627,6 +627,7 @@ namespace dxvk {
 
     uint32_t              m_inputMask = 0u;
     uint32_t              m_outputMask = 0u;
+    uint32_t              m_flatShadingMask = 0u;
     uint32_t              m_pushConstOffset = 0u;
     uint32_t              m_pushConstSize = 0u;
 
@@ -737,6 +738,7 @@ namespace dxvk {
     info.bindings = m_bindings.data();
     info.inputMask = m_inputMask;
     info.outputMask = m_outputMask;
+    info.flatShadingInputs = m_flatShadingMask;
     info.pushConstOffset = m_pushConstOffset;
     info.pushConstSize = m_pushConstSize;
 
@@ -788,8 +790,8 @@ namespace dxvk {
     bool diffuseOrSpec = semantic == DxsoSemantic{ DxsoUsage::Color, 0 }
                       || semantic == DxsoSemantic{ DxsoUsage::Color, 1 };
 
-    if (diffuseOrSpec && m_fsKey.Stages[0].Contents.GlobalFlatShade)
-      m_module.decorate(ptr, spv::DecorationFlat);
+    if (diffuseOrSpec)
+      m_flatShadingMask |= 1u << slot;
 
     std::string name = str::format(input ? "in_" : "out_", semantic.usage, semantic.usageIndex);
     m_module.setDebugName(ptr, name.c_str());

src/d3d9/d3d9_fixed_function.h

@@ -159,7 +159,6 @@ namespace dxvk {
         // Included in here, read from Stage 0 for packing reasons
         // Affects all stages.
         uint32_t     GlobalSpecularEnable : 1;
-        uint32_t     GlobalFlatShade      : 1;
       } Contents;
 
       uint32_t Primitive[2];