[dxvk] Implement sampler reduction mode

src/d3d11/d3d11_sampler.cpp

@@ -34,6 +34,8 @@ namespace dxvk {
     info.compareToDepth = (filterBits & 0x80) ? VK_TRUE : VK_FALSE;
     info.compareOp      = DecodeCompareOp(desc.ComparisonFunc);
     
+    info.reductionMode  = VK_SAMPLER_REDUCTION_MODE_WEIGHTED_AVERAGE;
+
     for (uint32_t i = 0; i < 4; i++)
       info.borderColor.float32[i] = desc.BorderColor[i];
     

src/d3d11/d3d11_video.cpp

@@ -362,6 +362,7 @@ namespace dxvk {
     samplerInfo.addressModeW    = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
     samplerInfo.compareToDepth  = VK_FALSE;
     samplerInfo.compareOp       = VK_COMPARE_OP_ALWAYS;
+    samplerInfo.reductionMode   = VK_SAMPLER_REDUCTION_MODE_WEIGHTED_AVERAGE;
     samplerInfo.borderColor     = VkClearColorValue();
     samplerInfo.usePixelCoord   = VK_FALSE;
     samplerInfo.nonSeamless     = VK_FALSE;

src/d3d9/d3d9_device.cpp

@@ -5978,6 +5978,7 @@ namespace dxvk {
       info.mipmapLodBias  = cKey.MipmapLodBias;
       info.mipmapLodMin   = mipFilter.MipsEnabled ? float(cKey.MaxMipLevel) : 0;
       info.mipmapLodMax   = mipFilter.MipsEnabled ? FLT_MAX                 : 0;
+      info.reductionMode  = VK_SAMPLER_REDUCTION_MODE_WEIGHTED_AVERAGE;
       info.usePixelCoord  = VK_FALSE;
       info.nonSeamless    = m_dxvkDevice->features().extNonSeamlessCubeMap.nonSeamlessCubeMap && !m_d3d9Options.seamlessCubes;
 

src/dxvk/dxvk_sampler.cpp

@@ -10,6 +10,9 @@ namespace dxvk {
     VkSamplerCustomBorderColorCreateInfoEXT borderColorInfo = { VK_STRUCTURE_TYPE_SAMPLER_CUSTOM_BORDER_COLOR_CREATE_INFO_EXT };
     borderColorInfo.customBorderColor   = info.borderColor;
 
+    VkSamplerReductionModeCreateInfo reductionInfo = { VK_STRUCTURE_TYPE_SAMPLER_REDUCTION_MODE_CREATE_INFO };
+    reductionInfo.reductionMode         = info.reductionMode;
+
     VkSamplerCreateInfo samplerInfo = { VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO };
     samplerInfo.flags                   = info.nonSeamless ? VK_SAMPLER_CREATE_NON_SEAMLESS_CUBE_MAP_BIT_EXT : 0;
     samplerInfo.magFilter               = info.magFilter;
@@ -39,6 +42,9 @@ namespace dxvk {
     if (samplerInfo.borderColor == VK_BORDER_COLOR_FLOAT_CUSTOM_EXT)
       borderColorInfo.pNext = std::exchange(samplerInfo.pNext, &borderColorInfo);
 
+    if (reductionInfo.reductionMode != VK_SAMPLER_REDUCTION_MODE_WEIGHTED_AVERAGE)
+      reductionInfo.pNext = std::exchange(samplerInfo.pNext, &reductionInfo);
+
     if (m_vkd->vkCreateSampler(m_vkd->device(),
         &samplerInfo, nullptr, &m_sampler) != VK_SUCCESS)
       throw DxvkError("DxvkSampler::DxvkSampler: Failed to create sampler");

src/dxvk/dxvk_sampler.h

@@ -33,9 +33,12 @@ namespace dxvk {
     VkBool32    compareToDepth;
     VkCompareOp compareOp;
     
+    /// Reduction mode for min/max samplers
+    VkSamplerReductionMode reductionMode;
+    
     /// Texture border color
     VkClearColorValue borderColor;
-    
+
     /// Enables unnormalized coordinates
     VkBool32 usePixelCoord;
 

src/dxvk/dxvk_swapchain_blitter.cpp

@@ -301,6 +301,7 @@ namespace dxvk {
     samplerInfo.addressModeW    = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_BORDER;
     samplerInfo.compareToDepth  = VK_FALSE;
     samplerInfo.compareOp       = VK_COMPARE_OP_ALWAYS;
+    samplerInfo.reductionMode   = VK_SAMPLER_REDUCTION_MODE_WEIGHTED_AVERAGE;
     samplerInfo.borderColor     = VkClearColorValue();
     samplerInfo.usePixelCoord   = VK_TRUE;
     samplerInfo.nonSeamless     = VK_FALSE;

src/dxvk/dxvk_unbound.cpp

@@ -29,6 +29,7 @@ namespace dxvk {
     info.addressModeW   = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
     info.compareToDepth = VK_FALSE;
     info.compareOp      = VK_COMPARE_OP_NEVER;
+    info.reductionMode  = VK_SAMPLER_REDUCTION_MODE_WEIGHTED_AVERAGE;
     info.borderColor    = VkClearColorValue();
     info.usePixelCoord  = VK_FALSE;
     info.nonSeamless    = VK_FALSE;

src/dxvk/hud/dxvk_hud_renderer.cpp

@@ -309,6 +309,7 @@ namespace dxvk::hud {
     info.addressModeW   = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
     info.compareToDepth = VK_FALSE;
     info.compareOp      = VK_COMPARE_OP_NEVER;
+    info.reductionMode  = VK_SAMPLER_REDUCTION_MODE_WEIGHTED_AVERAGE;
     info.borderColor    = VkClearColorValue();
     info.usePixelCoord  = VK_TRUE;
     info.nonSeamless    = VK_FALSE;