vk_swapchain: Prefer linear swapchain format when presenting sRGB images

Fixes broken sRGB when presenting from a secondary GPU.

src/video_core/renderer_vulkan/vk_blit_screen.cpp

@@ -356,7 +356,7 @@ void VKBlitScreen::CreateDescriptorPool() {
 void VKBlitScreen::CreateRenderPass() {
     const VkAttachmentDescription color_attachment{
         .flags = 0,
-        .format = swapchain.GetImageFormat(),
+        .format = swapchain.GetImageViewFormat(),
         .samples = VK_SAMPLE_COUNT_1_BIT,
         .loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR,
         .storeOp = VK_ATTACHMENT_STORE_OP_STORE,

src/video_core/renderer_vulkan/vk_swapchain.cpp

@@ -20,16 +20,15 @@ namespace Vulkan {
 
 namespace {
 
-VkSurfaceFormatKHR ChooseSwapSurfaceFormat(vk::Span<VkSurfaceFormatKHR> formats, bool srgb) {
+VkSurfaceFormatKHR ChooseSwapSurfaceFormat(vk::Span<VkSurfaceFormatKHR> formats) {
     if (formats.size() == 1 && formats[0].format == VK_FORMAT_UNDEFINED) {
         VkSurfaceFormatKHR format;
         format.format = VK_FORMAT_B8G8R8A8_UNORM;
         format.colorSpace = VK_COLOR_SPACE_SRGB_NONLINEAR_KHR;
         return format;
     }
-    const auto& found = std::find_if(formats.begin(), formats.end(), [srgb](const auto& format) {
-        const auto request_format = srgb ? VK_FORMAT_B8G8R8A8_SRGB : VK_FORMAT_B8G8R8A8_UNORM;
-        return format.format == request_format &&
+    const auto& found = std::find_if(formats.begin(), formats.end(), [](const auto& format) {
+        return format.format == VK_FORMAT_B8G8R8A8_UNORM &&
                format.colorSpace == VK_COLOR_SPACE_SRGB_NONLINEAR_KHR;
     });
     return found != formats.end() ? *found : formats[0];
@@ -145,7 +144,7 @@ void VKSwapchain::CreateSwapchain(const VkSurfaceCapabilitiesKHR& capabilities,
     const auto formats{physical_device.GetSurfaceFormatsKHR(surface)};
     const auto present_modes{physical_device.GetSurfacePresentModesKHR(surface)};
 
-    const VkSurfaceFormatKHR surface_format{ChooseSwapSurfaceFormat(formats, srgb)};
+    const VkSurfaceFormatKHR surface_format{ChooseSwapSurfaceFormat(formats)};
     const VkPresentModeKHR present_mode{ChooseSwapPresentMode(present_modes)};
 
     u32 requested_image_count{capabilities.minImageCount + 1};
@@ -191,7 +190,7 @@ void VKSwapchain::CreateSwapchain(const VkSurfaceCapabilitiesKHR& capabilities,
 
     images = swapchain.GetImages();
     image_count = static_cast<u32>(images.size());
-    image_format = surface_format.format;
+    image_view_format = srgb ? VK_FORMAT_B8G8R8A8_SRGB : VK_FORMAT_B8G8R8A8_UNORM;
 }
 
 void VKSwapchain::CreateSemaphores() {
@@ -207,7 +206,7 @@ void VKSwapchain::CreateImageViews() {
         .flags = 0,
         .image = {},
         .viewType = VK_IMAGE_VIEW_TYPE_2D,
-        .format = image_format,
+        .format = image_view_format,
         .components =
             {
                 .r = VK_COMPONENT_SWIZZLE_IDENTITY,

src/video_core/renderer_vulkan/vk_swapchain.h

@@ -68,8 +68,8 @@ public:
         return *image_views[index];
     }
 
-    VkFormat GetImageFormat() const {
-        return image_format;
+    VkFormat GetImageViewFormat() const {
+        return image_view_format;
     }
 
 private:
@@ -96,7 +96,7 @@ private:
     u32 image_index{};
     u32 frame_index{};
 
-    VkFormat image_format{};
+    VkFormat image_view_format{};
     VkExtent2D extent{};
 
     bool current_srgb{};