[vk] VK_EXT_multi_draw

src/video_core/renderer_vulkan/vk_rasterizer.cpp

@@ -214,6 +214,11 @@ RasterizerVulkan::RasterizerVulkan(Core::Frontend::EmuWindow& emu_window_, Tegra
       fence_manager(*this, gpu, texture_cache, buffer_cache, query_cache, device, scheduler),
       wfi_event(device.GetLogical().CreateEvent()) {
     scheduler.SetQueryCache(query_cache);
+    
+    // Log multi-draw support
+    if (device.IsExtMultiDrawSupported()) {
+        LOG_INFO(Render_Vulkan, "VK_EXT_multi_draw is enabled for optimized draw calls");
+    }
 }
 
 RasterizerVulkan::~RasterizerVulkan() = default;
@@ -252,16 +257,44 @@ void RasterizerVulkan::Draw(bool is_indexed, u32 instance_count) {
         const u32 num_instances{instance_count};
         const auto polygon_mode = VideoCore::EffectivePolygonMode(maxwell3d->regs);
         const DrawParams draw_params{MakeDrawParams(draw_state, num_instances, is_indexed, polygon_mode)};
-        scheduler.Record([draw_params](vk::CommandBuffer cmdbuf) {
-            if (draw_params.is_indexed) {
-                cmdbuf.DrawIndexed(draw_params.num_vertices, draw_params.num_instances,
-                                   draw_params.first_index, draw_params.base_vertex,
-                                   draw_params.base_instance);
-            } else {
-                cmdbuf.Draw(draw_params.num_vertices, draw_params.num_instances,
-                            draw_params.base_vertex, draw_params.base_instance);
-            }
-        });
+        
+        // Use VK_EXT_multi_draw if available (single draw becomes multi-draw with count=1)
+        if (device.IsExtMultiDrawSupported()) {
+            scheduler.Record([draw_params](vk::CommandBuffer cmdbuf) {
+                if (draw_params.is_indexed) {
+                    // Use multi-draw indexed with single draw
+                    const VkMultiDrawIndexedInfoEXT multi_draw_info{
+                        .firstIndex = draw_params.first_index,
+                        .indexCount = draw_params.num_vertices,
+                    };
+                    const int32_t vertex_offset = static_cast<int32_t>(draw_params.base_vertex);
+                    cmdbuf.DrawMultiIndexedEXT(1, &multi_draw_info, draw_params.num_instances,
+                                               draw_params.base_instance,
+                                               sizeof(VkMultiDrawIndexedInfoEXT), &vertex_offset);
+                } else {
+                    // Use multi-draw with single draw
+                    const VkMultiDrawInfoEXT multi_draw_info{
+                        .firstVertex = draw_params.base_vertex,
+                        .vertexCount = draw_params.num_vertices,
+                    };
+                    cmdbuf.DrawMultiEXT(1, &multi_draw_info, draw_params.num_instances,
+                                        draw_params.base_instance,
+                                        sizeof(VkMultiDrawInfoEXT));
+                }
+            });
+        } else {
+            // Fallback to standard draw calls
+            scheduler.Record([draw_params](vk::CommandBuffer cmdbuf) {
+                if (draw_params.is_indexed) {
+                    cmdbuf.DrawIndexed(draw_params.num_vertices, draw_params.num_instances,
+                                       draw_params.first_index, draw_params.base_vertex,
+                                       draw_params.base_instance);
+                } else {
+                    cmdbuf.Draw(draw_params.num_vertices, draw_params.num_instances,
+                                draw_params.base_vertex, draw_params.base_instance);
+                }
+            });
+        }
     });
 }
 

src/video_core/vulkan_common/vulkan_device.cpp

@@ -1126,6 +1126,11 @@ bool Device::GetSuitability(bool requires_swapchain) {
             VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_MAINTENANCE_5_PROPERTIES_KHR;
         SetNext(next, properties.maintenance5);
     }
+    if (extensions.multi_draw) {
+        properties.multi_draw.sType =
+            VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_MULTI_DRAW_PROPERTIES_EXT;
+        SetNext(next, properties.multi_draw);
+    }
 
     // Perform the property fetch.
     physical.GetProperties2(properties2);
@@ -1351,6 +1356,17 @@ void Device::RemoveUnsuitableExtensions() {
                                        features.vertex_input_dynamic_state,
                                        VK_EXT_VERTEX_INPUT_DYNAMIC_STATE_EXTENSION_NAME);
 
+    // VK_EXT_multi_draw
+    extensions.multi_draw = features.multi_draw.multiDraw;
+    
+    if (extensions.multi_draw) {
+        LOG_INFO(Render_Vulkan, "VK_EXT_multi_draw: maxMultiDrawCount={}",
+                 properties.multi_draw.maxMultiDrawCount);
+    }
+    
+    RemoveExtensionFeatureIfUnsuitable(extensions.multi_draw, features.multi_draw,
+                                       VK_EXT_MULTI_DRAW_EXTENSION_NAME);
+
     // VK_KHR_pipeline_executable_properties
     if (Settings::values.renderer_shader_feedback.GetValue()) {
         extensions.pipeline_executable_properties =

src/video_core/vulkan_common/vulkan_device.h

@@ -56,6 +56,7 @@ VK_DEFINE_HANDLE(VmaAllocator)
     FEATURE(EXT, 4444Formats, 4444_FORMATS, format_a4b4g4r4)                                       \
     FEATURE(EXT, IndexTypeUint8, INDEX_TYPE_UINT8, index_type_uint8)                               \
     FEATURE(EXT, LineRasterization, LINE_RASTERIZATION, line_rasterization)                        \
+    FEATURE(EXT, MultiDraw, MULTI_DRAW, multi_draw)                                                \
     FEATURE(EXT, PrimitiveTopologyListRestart, PRIMITIVE_TOPOLOGY_LIST_RESTART,                    \
             primitive_topology_list_restart)                                                       \
     FEATURE(EXT, ProvokingVertex, PROVOKING_VERTEX, provoking_vertex)                              \
@@ -818,6 +819,11 @@ public:
         return extensions.maintenance6;
     }
 
+    /// Returns true if the device supports VK_EXT_multi_draw.
+    bool IsExtMultiDrawSupported() const {
+        return extensions.multi_draw;
+    }
+
     /// Returns true if the device supports VK_KHR_maintenance7.
     bool IsKhrMaintenance7Supported() const {
         return extensions.maintenance7;
@@ -950,6 +956,7 @@ private:
         VkPhysicalDeviceSubgroupSizeControlProperties subgroup_size_control{};
         VkPhysicalDeviceTransformFeedbackPropertiesEXT transform_feedback{};
         VkPhysicalDeviceMaintenance5PropertiesKHR maintenance5{};
+        VkPhysicalDeviceMultiDrawPropertiesEXT multi_draw{};
 
         VkPhysicalDeviceProperties properties{};
     };

src/video_core/vulkan_common/vulkan_wrapper.cpp

@@ -116,6 +116,8 @@ void Load(VkDevice device, DeviceDispatch& dld) noexcept {
     X(vkCmdDrawIndirectCount);
     X(vkCmdDrawIndexedIndirectCount);
     X(vkCmdDrawIndirectByteCountEXT);
+    X(vkCmdDrawMultiEXT);
+    X(vkCmdDrawMultiIndexedEXT);
     X(vkCmdEndConditionalRenderingEXT);
     X(vkCmdEndQuery);
     X(vkCmdEndRenderPass);

src/video_core/vulkan_common/vulkan_wrapper.h

@@ -216,6 +216,8 @@ struct DeviceDispatch : InstanceDispatch {
     PFN_vkCmdDrawIndirectCount vkCmdDrawIndirectCount{};
     PFN_vkCmdDrawIndexedIndirectCount vkCmdDrawIndexedIndirectCount{};
     PFN_vkCmdDrawIndirectByteCountEXT vkCmdDrawIndirectByteCountEXT{};
+    PFN_vkCmdDrawMultiEXT vkCmdDrawMultiEXT{};
+    PFN_vkCmdDrawMultiIndexedEXT vkCmdDrawMultiIndexedEXT{};
     PFN_vkCmdEndConditionalRenderingEXT vkCmdEndConditionalRenderingEXT{};
     PFN_vkCmdEndDebugUtilsLabelEXT vkCmdEndDebugUtilsLabelEXT{};
     PFN_vkCmdEndQuery vkCmdEndQuery{};
@@ -1239,6 +1241,19 @@ public:
                                            counter_buffer_offset, counter_offset, stride);
     }
 
+    void DrawMultiEXT(u32 draw_count, const VkMultiDrawInfoEXT* vertex_info,
+                      u32 instance_count, u32 first_instance, u32 stride) const noexcept {
+        dld->vkCmdDrawMultiEXT(handle, draw_count, vertex_info, instance_count, first_instance,
+                               stride);
+    }
+
+    void DrawMultiIndexedEXT(u32 draw_count, const VkMultiDrawIndexedInfoEXT* index_info,
+                             u32 instance_count, u32 first_instance, u32 stride,
+                             const int32_t* vertex_offset) const noexcept {
+        dld->vkCmdDrawMultiIndexedEXT(handle, draw_count, index_info, instance_count,
+                                      first_instance, stride, vertex_offset);
+    }
+
     void ClearAttachments(Span<VkClearAttachment> attachments,
                           Span<VkClearRect> rects) const noexcept {
         dld->vkCmdClearAttachments(handle, attachments.size(), attachments.data(), rects.size(),