[d3d11] Implement conservative rasterization

Needed for Nvidia ShadowLibs in Final Fantasy XV.

src/d3d11/d3d11_device.cpp

@@ -1121,7 +1121,11 @@ namespace dxvk {
     
     if (FAILED(D3D11RasterizerState::NormalizeDesc(&desc)))
       return E_INVALIDARG;
-    
+
+    if (desc.ConservativeRaster != D3D11_CONSERVATIVE_RASTERIZATION_MODE_OFF
+     && !m_dxvkDevice->extensions().extConservativeRasterization)
+      return E_INVALIDARG;
+
     if (!ppRasterizerState)
       return S_FALSE;
     
@@ -1682,6 +1686,12 @@ namespace dxvk {
         info->TiledResourcesTier             = D3D11_TILED_RESOURCES_NOT_SUPPORTED;
         info->StandardSwizzle                = FALSE;
         info->UnifiedMemoryArchitecture      = m_dxvkDevice->isUnifiedMemoryArchitecture();
+
+        if (m_dxvkDevice->extensions().extConservativeRasterization) {
+          // We don't have a way to query uncertainty regions, so just check degenerate triangle behaviour
+          info->ConservativeRasterizationTier = m_dxvkDevice->properties().extConservativeRasterization.degenerateTrianglesRasterized
+            ? D3D11_CONSERVATIVE_RASTERIZATION_TIER_2 : D3D11_CONSERVATIVE_RASTERIZATION_TIER_1;
+        }
       } return S_OK;
 
       case D3D11_FEATURE_D3D11_OPTIONS3: {

src/d3d11/d3d11_rasterizer.cpp

@@ -35,7 +35,7 @@ namespace dxvk {
     // we do not need to enable it in case the parameters are both 0.
     m_state.depthBiasEnable   = desc.DepthBias != 0 || desc.SlopeScaledDepthBias != 0.0f;
     m_state.depthClipEnable   = desc.DepthClipEnable;
-    m_state.conservativeMode  = VK_CONSERVATIVE_RASTERIZATION_MODE_DISABLED_EXT;
+    m_state.conservativeMode  = DecodeConservativeRasterizationMode(desc.ConservativeRaster);
     m_state.sampleCount       = VkSampleCountFlags(desc.ForcedSampleCount);
 
     m_depthBias.depthBiasConstant = float(desc.DepthBias);
@@ -189,10 +189,6 @@ namespace dxvk {
         return E_INVALIDARG;
     }
 
-    // Conservative rasterization currently not supported
-    if (pDesc->ConservativeRaster != D3D11_CONSERVATIVE_RASTERIZATION_MODE_OFF)
-      return E_INVALIDARG;
-    
     return S_OK;
   }
   

src/d3d11/d3d11_util.cpp

@@ -64,6 +64,20 @@ namespace dxvk {
   }
   
   
+  VkConservativeRasterizationModeEXT DecodeConservativeRasterizationMode(
+          D3D11_CONSERVATIVE_RASTERIZATION_MODE Mode) {
+    switch (Mode) {
+      case D3D11_CONSERVATIVE_RASTERIZATION_MODE_OFF:
+        return VK_CONSERVATIVE_RASTERIZATION_MODE_DISABLED_EXT;
+      case D3D11_CONSERVATIVE_RASTERIZATION_MODE_ON:
+        return VK_CONSERVATIVE_RASTERIZATION_MODE_OVERESTIMATE_EXT;
+    }
+
+    Logger::err(str::format("D3D11: Unsupported conservative raster mode: ", Mode));
+    return VK_CONSERVATIVE_RASTERIZATION_MODE_DISABLED_EXT;
+  }
+
+
   VkShaderStageFlagBits GetShaderStage(DxbcProgramType ProgramType) {
     switch (ProgramType) {
       case DxbcProgramType::VertexShader:   return VK_SHADER_STAGE_VERTEX_BIT;

src/d3d11/d3d11_util.h

@@ -31,6 +31,9 @@ namespace dxvk {
   VkCompareOp DecodeCompareOp(
           D3D11_COMPARISON_FUNC     Mode);
   
+  VkConservativeRasterizationModeEXT DecodeConservativeRasterizationMode(
+          D3D11_CONSERVATIVE_RASTERIZATION_MODE Mode);
+
   VkShaderStageFlagBits GetShaderStage(
           DxbcProgramType           ProgramType);