[d3d9,dxso] Add d3d9.forceSampleRateShading option

dxvk.conf

@@ -208,6 +208,7 @@
 # Supported values: True, False
 
 # d3d11.forceSampleRateShading = False
+# d3d9.forceSampleRateShading = False
 
 
 # Forces the sample count of all textures to 1, and performs

src/d3d9/d3d9_fixed_function.cpp

@@ -14,6 +14,7 @@ namespace dxvk {
 
   D3D9FixedFunctionOptions::D3D9FixedFunctionOptions(const D3D9Options* options) {
     invariantPosition = options->invariantPosition;
+    forceSampleRateShading = options->forceSampleRateShading;
   }
 
   uint32_t DoFixedFunctionFog(D3D9ShaderSpecConstantManager& spec, SpirvModule& spvModule, const D3D9FogContext& fogCtx) {
@@ -933,10 +934,16 @@ namespace dxvk {
 
     uint32_t ptr = m_module.newVar(ptrType, storageClass);
 
-    if (builtin == spv::BuiltInMax)
+    if (builtin == spv::BuiltInMax) {
       m_module.decorateLocation(ptr, slot);
-    else
+
+      if (isPS() && input && m_options.forceSampleRateShading) {
+        m_module.enableCapability(spv::CapabilitySampleRateShading);
+        m_module.decorate(ptr, spv::DecorationSample);
+      }
+    } else {
       m_module.decorateBuiltIn(ptr, builtin);
+    }
 
     bool diffuseOrSpec = semantic == DxsoSemantic{ DxsoUsage::Color, 0 }
                       || semantic == DxsoSemantic{ DxsoUsage::Color, 1 };

src/d3d9/d3d9_fixed_function.h

@@ -49,6 +49,7 @@ namespace dxvk {
     D3D9FixedFunctionOptions(const D3D9Options* options);
 
     bool invariantPosition;
+    bool forceSampleRateShading;
   };
 
   // Returns new oFog if VS

src/d3d9/d3d9_options.cpp

@@ -63,6 +63,7 @@ namespace dxvk {
     this->enableDialogMode              = config.getOption<bool>        ("d3d9.enableDialogMode",              false);
     this->forceSamplerTypeSpecConstants = config.getOption<bool>        ("d3d9.forceSamplerTypeSpecConstants", false);
     this->forceSwapchainMSAA            = config.getOption<int32_t>     ("d3d9.forceSwapchainMSAA",            -1);
+    this->forceSampleRateShading        = config.getOption<bool>        ("d3d9.forceSampleRateShading",        false);
     this->forceAspectRatio              = config.getOption<std::string> ("d3d9.forceAspectRatio",              "");
     this->allowDiscard                  = config.getOption<bool>        ("d3d9.allowDiscard",                  true);
     this->enumerateByDisplays           = config.getOption<bool>        ("d3d9.enumerateByDisplays",           true);

src/d3d9/d3d9_options.h

@@ -123,6 +123,9 @@ namespace dxvk {
     /// Forces an MSAA level on the swapchain
     int32_t forceSwapchainMSAA;
 
+    /// Forces sample rate shading
+    bool forceSampleRateShading;
+
     /// Allow D3DLOCK_DISCARD
     bool allowDiscard;
 

src/dxso/dxso_compiler.cpp

@@ -3192,6 +3192,12 @@ void DxsoCompiler::emitControlFlowGenericLoop(
 
       m_module.decorateLocation(inputPtr.id, slot);
 
+      if (m_programInfo.type() == DxsoProgramType::PixelShader
+       && m_moduleInfo.options.forceSampleRateShading) {
+        m_module.enableCapability(spv::CapabilitySampleRateShading);
+        m_module.decorate(inputPtr.id, spv::DecorationSample);
+      }
+
       std::string name =
         str::format("in_", elem.semantic.usage, elem.semantic.usageIndex);
       m_module.setDebugName(inputPtr.id, name.c_str());

src/dxso/dxso_options.cpp

@@ -25,6 +25,7 @@ namespace dxvk {
     invariantPosition    = options.invariantPosition;
 
     forceSamplerTypeSpecConstants = options.forceSamplerTypeSpecConstants;
+    forceSampleRateShading = options.forceSampleRateShading;
 
     vertexFloatConstantBufferAsSSBO = pDevice->GetVertexConstantLayout().floatSize() > devInfo.core.properties.limits.maxUniformBufferRange;
 

src/dxso/dxso_options.h

@@ -36,6 +36,9 @@ namespace dxvk {
     /// Works around a game bug in Halo CE where it gives cube textures to 2d/volume samplers
     bool forceSamplerTypeSpecConstants;
 
+    /// Interpolate pixel shader inputs at the sample location rather than pixel center
+    bool forceSampleRateShading;
+
     /// Should the SWVP float constant buffer be a SSBO (because of the size on NV)
     bool vertexFloatConstantBufferAsSSBO;