Vulkan: Implement Alpha coverage

src/video_core/renderer_vulkan/fixed_pipeline_state.cpp

@@ -93,6 +93,8 @@ void FixedPipelineState::Refresh(Tegra::Engines::Maxwell3D& maxwell3d,
     provoking_vertex_last.Assign(regs.provoking_vertex == Maxwell::ProvokingVertex::Last ? 1 : 0);
     conservative_raster_enable.Assign(regs.conservative_raster_enable != 0 ? 1 : 0);
     smooth_lines.Assign(regs.line_anti_alias_enable != 0 ? 1 : 0);
+    alpha_to_coverage_enabled.Assign(regs.anti_alias_alpha_control.alpha_to_coverage != 0 ? 1 : 0);
+    alpha_to_one_enabled.Assign(regs.anti_alias_alpha_control.alpha_to_one != 0 ? 1 : 0);
 
     for (size_t i = 0; i < regs.rt.size(); ++i) {
         color_formats[i] = static_cast<u8>(regs.rt[i].format);

src/video_core/renderer_vulkan/fixed_pipeline_state.h

@@ -195,6 +195,8 @@ struct FixedPipelineState {
         BitField<12, 1, u32> provoking_vertex_last;
         BitField<13, 1, u32> conservative_raster_enable;
         BitField<14, 1, u32> smooth_lines;
+        BitField<15, 1, u32> alpha_to_coverage_enabled;
+        BitField<16, 1, u32> alpha_to_one_enabled;
     };
     std::array<u8, Maxwell::NumRenderTargets> color_formats;
 

src/video_core/renderer_vulkan/vk_graphics_pipeline.cpp

@@ -714,8 +714,8 @@ void GraphicsPipeline::MakePipeline(VkRenderPass render_pass) {
         .sampleShadingEnable = VK_FALSE,
         .minSampleShading = 0.0f,
         .pSampleMask = nullptr,
-        .alphaToCoverageEnable = VK_FALSE,
-        .alphaToOneEnable = VK_FALSE,
+        .alphaToCoverageEnable = key.state.alpha_to_coverage_enabled != 0 ? VK_TRUE : VK_FALSE,
+        .alphaToOneEnable = key.state.alpha_to_one_enabled != 0 ? VK_TRUE : VK_FALSE,
     };
     const VkPipelineDepthStencilStateCreateInfo depth_stencil_ci{
         .sType = VK_STRUCTURE_TYPE_PIPELINE_DEPTH_STENCIL_STATE_CREATE_INFO,