[dxvk] Introduce extra pipeline state

Provides extra state that will be passed in via spec constants.
Whether or not this state is used is determined by the shaders.

src/dxvk/dxvk_constant_state.h

@@ -180,4 +180,16 @@ namespace dxvk {
     std::array<DxvkVertexBinding,   DxvkLimits::MaxNumVertexBindings>   bindings;
   };
   
+  
+  /**
+   * \brief Extra state
+   * 
+   * Additional state that will be passed to
+   * the graphics pipeline as specialization
+   * constants.
+   */
+  struct DxvkExtraState {
+    VkCompareOp           alphaCompareOp;
+  };
+  
 }

src/dxvk/dxvk_context.cpp

@@ -2031,6 +2031,14 @@ namespace dxvk {
   }
 
 
+  void DxvkContext::setExtraState(
+    const DxvkExtraState&     xs) {
+    m_state.gp.state.xsAlphaCompareOp = xs.alphaCompareOp;
+    
+    m_flags.set(DxvkContextFlag::GpDirtyPipelineState);
+  }
+  
+  
   void DxvkContext::setPredicate(
     const DxvkBufferSlice&    predicate,
           VkConditionalRenderingFlagsEXT flags) {

src/dxvk/dxvk_context.h

@@ -813,6 +813,13 @@ namespace dxvk {
             uint32_t            attachment,
       const DxvkBlendMode&      blendMode);
     
+    /**
+     * \brief Sets extra pipeline state
+     * \param [in] xs New state object
+     */
+    void setExtraState(
+      const DxvkExtraState&     xs);
+    
     /**
      * \brief Sets predicate
      *

src/dxvk/dxvk_graphics.cpp

@@ -204,6 +204,8 @@ namespace dxvk {
     // Set up some specialization constants
     DxvkSpecConstantData specData;
     specData.rasterizerSampleCount = uint32_t(sampleCount);
+    specData.alphaTestEnable       = state.xsAlphaCompareOp != VK_COMPARE_OP_ALWAYS;
+    specData.alphaCompareOp        = state.xsAlphaCompareOp;
     
     for (uint32_t i = 0; i < MaxNumActiveBindings; i++)
       specData.activeBindings[i] = state.bsBindingMask.isBound(i) ? VK_TRUE : VK_FALSE;
@@ -353,7 +355,7 @@ namespace dxvk {
     msInfo.minSampleShading       = m_common.msSampleShadingFactor;
     msInfo.pSampleMask            = &state.msSampleMask;
     msInfo.alphaToCoverageEnable  = state.msEnableAlphaToCoverage;
-    msInfo.alphaToOneEnable       = state.msEnableAlphaToOne;
+    msInfo.alphaToOneEnable       = VK_FALSE;
     
     VkPipelineDepthStencilStateCreateInfo dsInfo;
     dsInfo.sType                  = VK_STRUCTURE_TYPE_PIPELINE_DEPTH_STENCIL_STATE_CREATE_INFO;

src/dxvk/dxvk_graphics.h

@@ -92,7 +92,8 @@ namespace dxvk {
     VkSampleCountFlags                  msSampleCount;
     uint32_t                            msSampleMask;
     VkBool32                            msEnableAlphaToCoverage;
-    VkBool32                            msEnableAlphaToOne;
+    
+    VkCompareOp                         xsAlphaCompareOp;
     
     VkBool32                            dsEnableDepthTest;
     VkBool32                            dsEnableDepthWrite;

src/dxvk/dxvk_shader.h

@@ -30,10 +30,12 @@ namespace dxvk {
     // Specialization constants for pipeline state
     SpecConstantRangeStart      = ColorComponentMappings + MaxNumRenderTargets * 4,
     RasterizerSampleCount       = SpecConstantRangeStart + 0,
+    AlphaTestEnable,
+    AlphaCompareOp,
 
     /// Lowest and highest known spec constant IDs
     SpecConstantIdMin           = RasterizerSampleCount,
-    SpecConstantIdMax           = RasterizerSampleCount,
+    SpecConstantIdMax           = AlphaCompareOp,
   };
   
   

src/dxvk/dxvk_spec_const.cpp

@@ -11,6 +11,8 @@ namespace dxvk {
   
   DxvkSpecConstantMap::DxvkSpecConstantMap() {
     SET_CONSTANT_ENTRY(DxvkSpecConstantId::RasterizerSampleCount, rasterizerSampleCount);
+    SET_CONSTANT_ENTRY(DxvkSpecConstantId::AlphaTestEnable,       alphaTestEnable);
+    SET_CONSTANT_ENTRY(DxvkSpecConstantId::AlphaCompareOp,        alphaCompareOp);
 
     for (uint32_t i = 0; i < MaxNumActiveBindings; i++)
       this->setBindingEntry(i);

src/dxvk/dxvk_spec_const.h

@@ -18,6 +18,8 @@ namespace dxvk {
    */
   struct DxvkSpecConstantData {
     uint32_t rasterizerSampleCount;
+    VkBool32 alphaTestEnable;
+    VkCompareOp alphaCompareOp;
     uint32_t outputMappings[MaxNumRenderTargets * 4];
     VkBool32 activeBindings[MaxNumActiveBindings];
   };