vk_graphics_pipeline: Implement conservative rendering

src/video_core/engines/maxwell_3d.h

@@ -910,7 +910,11 @@ public:
 
                 u32 fill_rectangle;
 
-                INSERT_PADDING_WORDS_NOINIT(0x8);
+                INSERT_PADDING_WORDS_NOINIT(0x2);
+
+                u32 conservative_raster_enable;
+
+                INSERT_PADDING_WORDS_NOINIT(0x5);
 
                 std::array<VertexAttribute, NumVertexAttributes> vertex_attrib_format;
 
@@ -1615,6 +1619,7 @@ ASSERT_REG_POSITION(zeta, 0x3F8);
 ASSERT_REG_POSITION(render_area, 0x3FD);
 ASSERT_REG_POSITION(clear_flags, 0x43E);
 ASSERT_REG_POSITION(fill_rectangle, 0x44F);
+ASSERT_REG_POSITION(conservative_raster_enable, 0x452);
 ASSERT_REG_POSITION(vertex_attrib_format, 0x458);
 ASSERT_REG_POSITION(multisample_sample_locations, 0x478);
 ASSERT_REG_POSITION(multisample_coverage_to_color, 0x47E);

src/video_core/renderer_vulkan/fixed_pipeline_state.cpp

@@ -87,6 +87,7 @@ void FixedPipelineState::Refresh(Tegra::Engines::Maxwell3D& maxwell3d,
     depth_format.Assign(static_cast<u32>(regs.zeta.format));
     y_negate.Assign(regs.screen_y_control.y_negate != 0 ? 1 : 0);
     provoking_vertex_last.Assign(regs.provoking_vertex_last != 0 ? 1 : 0);
+    conservative_raster_enable.Assign(regs.conservative_raster_enable != 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

@@ -194,6 +194,7 @@ struct FixedPipelineState {
         BitField<6, 5, u32> depth_format;
         BitField<11, 1, u32> y_negate;
         BitField<12, 1, u32> provoking_vertex_last;
+        BitField<13, 1, u32> conservative_raster_enable;
     };
     std::array<u8, Maxwell::NumRenderTargets> color_formats;
 

src/video_core/renderer_vulkan/vk_graphics_pipeline.cpp

@@ -599,16 +599,9 @@ void GraphicsPipeline::MakePipeline(VkRenderPass render_pass) {
         .pScissors = nullptr,
     };
 
-    const VkPipelineRasterizationProvokingVertexStateCreateInfoEXT provoking_vertex{
-        .sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_PROVOKING_VERTEX_STATE_CREATE_INFO_EXT,
-        .pNext = nullptr,
-        .provokingVertexMode = key.state.provoking_vertex_last != 0
-                                   ? VK_PROVOKING_VERTEX_MODE_LAST_VERTEX_EXT
-                                   : VK_PROVOKING_VERTEX_MODE_FIRST_VERTEX_EXT,
-    };
-    const VkPipelineRasterizationStateCreateInfo rasterization_ci{
+    VkPipelineRasterizationStateCreateInfo rasterization_ci{
         .sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO,
-        .pNext = device.IsExtProvokingVertexSupported() ? &provoking_vertex : nullptr,
+        .pNext = nullptr,
         .flags = 0,
         .depthClampEnable =
             static_cast<VkBool32>(key.state.depth_clamp_disabled == 0 ? VK_TRUE : VK_FALSE),
@@ -625,6 +618,28 @@ void GraphicsPipeline::MakePipeline(VkRenderPass render_pass) {
         .depthBiasSlopeFactor = 0.0f,
         .lineWidth = 1.0f,
     };
+    VkPipelineRasterizationConservativeStateCreateInfoEXT conservative_raster{
+        .sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_CONSERVATIVE_STATE_CREATE_INFO_EXT,
+        .pNext = nullptr,
+        .flags = 0,
+        .conservativeRasterizationMode = key.state.conservative_raster_enable != 0
+                                             ? VK_CONSERVATIVE_RASTERIZATION_MODE_OVERESTIMATE_EXT
+                                             : VK_CONSERVATIVE_RASTERIZATION_MODE_DISABLED_EXT,
+        .extraPrimitiveOverestimationSize = 0.0f,
+    };
+    VkPipelineRasterizationProvokingVertexStateCreateInfoEXT provoking_vertex{
+        .sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_PROVOKING_VERTEX_STATE_CREATE_INFO_EXT,
+        .pNext = nullptr,
+        .provokingVertexMode = key.state.provoking_vertex_last != 0
+                                   ? VK_PROVOKING_VERTEX_MODE_LAST_VERTEX_EXT
+                                   : VK_PROVOKING_VERTEX_MODE_FIRST_VERTEX_EXT,
+    };
+    if (device.IsExtConservativeRasterizationSupported()) {
+        conservative_raster.pNext = std::exchange(rasterization_ci.pNext, &conservative_raster);
+    }
+    if (device.IsExtProvokingVertexSupported()) {
+        provoking_vertex.pNext = std::exchange(rasterization_ci.pNext, &provoking_vertex);
+    }
 
     const VkPipelineMultisampleStateCreateInfo multisample_ci{
         .sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO,

src/video_core/vulkan_common/vulkan_device.cpp

@@ -412,6 +412,10 @@ Device::Device(VkInstance instance_, vk::PhysicalDevice physical_, VkSurfaceKHR
         LOG_INFO(Render_Vulkan, "Device doesn't support extended dynamic state");
     }
 
+    if (!ext_conservative_rasterization) {
+        LOG_INFO(Render_Vulkan, "Device doesn't support conservative rasterization");
+    }
+
     VkPhysicalDeviceProvokingVertexFeaturesEXT provoking_vertex;
     if (ext_provoking_vertex) {
         provoking_vertex = {
@@ -776,6 +780,8 @@ std::vector<const char*> Device::LoadExtensions(bool requires_surface) {
              true);
         test(ext_tooling_info, VK_EXT_TOOLING_INFO_EXTENSION_NAME, true);
         test(ext_shader_stencil_export, VK_EXT_SHADER_STENCIL_EXPORT_EXTENSION_NAME, true);
+        test(ext_conservative_rasterization, VK_EXT_CONSERVATIVE_RASTERIZATION_EXTENSION_NAME,
+             true);
         test(has_ext_transform_feedback, VK_EXT_TRANSFORM_FEEDBACK_EXTENSION_NAME, false);
         test(has_ext_custom_border_color, VK_EXT_CUSTOM_BORDER_COLOR_EXTENSION_NAME, false);
         test(has_ext_extended_dynamic_state, VK_EXT_EXTENDED_DYNAMIC_STATE_EXTENSION_NAME, false);

src/video_core/vulkan_common/vulkan_device.h

@@ -264,6 +264,11 @@ public:
         return ext_shader_stencil_export;
     }
 
+    /// Returns true if the device supports VK_EXT_conservative_rasterization.
+    bool IsExtConservativeRasterizationSupported() const {
+        return ext_conservative_rasterization;
+    }
+
     /// Returns true if the device supports VK_EXT_provoking_vertex.
     bool IsExtProvokingVertexSupported() const {
         return ext_provoking_vertex;
@@ -374,6 +379,7 @@ private:
     bool ext_vertex_input_dynamic_state{};  ///< Support for VK_EXT_vertex_input_dynamic_state.
     bool ext_shader_stencil_export{};       ///< Support for VK_EXT_shader_stencil_export.
     bool ext_shader_atomic_int64{};         ///< Support for VK_KHR_shader_atomic_int64.
+    bool ext_conservative_rasterization{};  ///< Support for VK_EXT_conservative_rasterization.
     bool ext_provoking_vertex{};            ///< Support for VK_EXT_provoking_vertex.
     bool nv_device_diagnostics_config{};    ///< Support for VK_NV_device_diagnostics_config.
     bool has_renderdoc{};                   ///< Has RenderDoc attached