vulkan_device: Enable VK_KHR_swapchain_mutable_format if available

Silences validation errors when creating sRGB image views of linear swapchain images

src/video_core/renderer_vulkan/vk_swapchain.cpp

@@ -179,6 +179,17 @@ void VKSwapchain::CreateSwapchain(const VkSurfaceCapabilitiesKHR& capabilities,
         swapchain_ci.queueFamilyIndexCount = static_cast<u32>(queue_indices.size());
         swapchain_ci.pQueueFamilyIndices = queue_indices.data();
     }
+    static constexpr std::array view_formats{VK_FORMAT_B8G8R8A8_UNORM, VK_FORMAT_B8G8R8A8_SRGB};
+    VkImageFormatListCreateInfo format_list{
+        .sType = VK_STRUCTURE_TYPE_IMAGE_FORMAT_LIST_CREATE_INFO_KHR,
+        .pNext = nullptr,
+        .viewFormatCount = static_cast<u32>(view_formats.size()),
+        .pViewFormats = view_formats.data(),
+    };
+    if (device.IsKhrSwapchainMutableFormatEnabled()) {
+        format_list.pNext = std::exchange(swapchain_ci.pNext, &format_list);
+        swapchain_ci.flags |= VK_SWAPCHAIN_CREATE_MUTABLE_FORMAT_BIT_KHR;
+    }
     // Request the size again to reduce the possibility of a TOCTOU race condition.
     const auto updated_capabilities = physical_device.GetSurfaceCapabilitiesKHR(surface);
     swapchain_ci.imageExtent = ChooseSwapExtent(updated_capabilities, width, height);

src/video_core/vulkan_common/vulkan_device.cpp

@@ -839,6 +839,8 @@ std::vector<const char*> Device::LoadExtensions(bool requires_surface) {
     bool has_khr_shader_float16_int8{};
     bool has_khr_workgroup_memory_explicit_layout{};
     bool has_khr_pipeline_executable_properties{};
+    bool has_khr_image_format_list{};
+    bool has_khr_swapchain_mutable_format{};
     bool has_ext_subgroup_size_control{};
     bool has_ext_transform_feedback{};
     bool has_ext_custom_border_color{};
@@ -888,6 +890,9 @@ std::vector<const char*> Device::LoadExtensions(bool requires_surface) {
         test(has_ext_shader_atomic_int64, VK_KHR_SHADER_ATOMIC_INT64_EXTENSION_NAME, false);
         test(has_khr_workgroup_memory_explicit_layout,
              VK_KHR_WORKGROUP_MEMORY_EXPLICIT_LAYOUT_EXTENSION_NAME, false);
+        test(has_khr_image_format_list, VK_KHR_IMAGE_FORMAT_LIST_EXTENSION_NAME, false);
+        test(has_khr_swapchain_mutable_format, VK_KHR_SWAPCHAIN_MUTABLE_FORMAT_EXTENSION_NAME,
+             false);
         test(has_ext_line_rasterization, VK_EXT_LINE_RASTERIZATION_EXTENSION_NAME, false);
         if (Settings::values.enable_nsight_aftermath) {
             test(nv_device_diagnostics_config, VK_NV_DEVICE_DIAGNOSTICS_CONFIG_EXTENSION_NAME,
@@ -1066,6 +1071,11 @@ std::vector<const char*> Device::LoadExtensions(bool requires_surface) {
             khr_pipeline_executable_properties = true;
         }
     }
+    if (has_khr_image_format_list && has_khr_swapchain_mutable_format) {
+        extensions.push_back(VK_KHR_IMAGE_FORMAT_LIST_EXTENSION_NAME);
+        extensions.push_back(VK_KHR_SWAPCHAIN_MUTABLE_FORMAT_EXTENSION_NAME);
+        khr_swapchain_mutable_format = true;
+    }
     if (khr_push_descriptor) {
         VkPhysicalDevicePushDescriptorPropertiesKHR push_descriptor;
         push_descriptor.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_PUSH_DESCRIPTOR_PROPERTIES_KHR;

src/video_core/vulkan_common/vulkan_device.h

@@ -224,6 +224,11 @@ public:
         return khr_pipeline_executable_properties;
     }
 
+    /// Returns true if VK_KHR_swapchain_mutable_format is enabled.
+    bool IsKhrSwapchainMutableFormatEnabled() const {
+        return khr_swapchain_mutable_format;
+    }
+
     /// Returns true if the device supports VK_KHR_workgroup_memory_explicit_layout.
     bool IsKhrWorkgroupMemoryExplicitLayoutSupported() const {
         return khr_workgroup_memory_explicit_layout;
@@ -390,6 +395,7 @@ private:
     bool khr_workgroup_memory_explicit_layout{}; ///< Support for explicit workgroup layouts.
     bool khr_push_descriptor{};                  ///< Support for VK_KHR_push_descritor.
     bool khr_pipeline_executable_properties{};   ///< Support for executable properties.
+    bool khr_swapchain_mutable_format{};         ///< Support for VK_KHR_swapchain_mutable_format.
     bool ext_index_type_uint8{};                 ///< Support for VK_EXT_index_type_uint8.
     bool ext_sampler_filter_minmax{};            ///< Support for VK_EXT_sampler_filter_minmax.
     bool ext_depth_range_unrestricted{};         ///< Support for VK_EXT_depth_range_unrestricted.