From ae758a236f5dd1c09bb497b0eded77446858a677 Mon Sep 17 00:00:00 2001
From: ameerj <52414509+ameerj@users.noreply.github.com>
Date: Sat, 24 Apr 2021 23:59:42 -0400
Subject: [PATCH] vk_texture_cache: Swap R and B channels of color flipped
 format

Swaps the Red and Blue channels of the A1B5G5R5_UNORM texture format, which was being incorrectly rendered.
---
 .../renderer_vulkan/vk_texture_cache.cpp      | 25 ++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/src/video_core/renderer_vulkan/vk_texture_cache.cpp b/src/video_core/renderer_vulkan/vk_texture_cache.cpp
index bc2a53841..017348e05 100644
--- a/src/video_core/renderer_vulkan/vk_texture_cache.cpp
+++ b/src/video_core/renderer_vulkan/vk_texture_cache.cpp
@@ -417,7 +417,7 @@ constexpr VkBorderColor ConvertBorderColor(const std::array<float, 4>& color) {
     };
 }
 
-[[nodiscard]] constexpr SwizzleSource ConvertGreenRed(SwizzleSource value) {
+[[nodiscard]] SwizzleSource ConvertGreenRed(SwizzleSource value) {
     switch (value) {
     case SwizzleSource::G:
         return SwizzleSource::R;
@@ -426,6 +426,17 @@ constexpr VkBorderColor ConvertBorderColor(const std::array<float, 4>& color) {
     }
 }
 
+[[nodiscard]] SwizzleSource SwapBlueRed(SwizzleSource value) {
+    switch (value) {
+    case SwizzleSource::R:
+        return SwizzleSource::B;
+    case SwizzleSource::B:
+        return SwizzleSource::R;
+    default:
+        return value;
+    }
+}
+
 void CopyBufferToImage(vk::CommandBuffer cmdbuf, VkBuffer src_buffer, VkImage image,
                        VkImageAspectFlags aspect_mask, bool is_initialized,
                        std::span<const VkBufferImageCopy> copies) {
@@ -543,6 +554,15 @@ void CopyBufferToImage(vk::CommandBuffer cmdbuf, VkBuffer src_buffer, VkImage im
     };
 }
 
+[[nodiscard]] bool IsFormatFlipped(PixelFormat format) {
+    switch (format) {
+    case PixelFormat::A1B5G5R5_UNORM:
+        return true;
+    default:
+        return false;
+    }
+}
+
 struct RangedBarrierRange {
     u32 min_mip = std::numeric_limits<u32>::max();
     u32 max_mip = std::numeric_limits<u32>::min();
@@ -948,6 +968,9 @@ ImageView::ImageView(TextureCacheRuntime& runtime, const VideoCommon::ImageViewI
     };
     if (!info.IsRenderTarget()) {
         swizzle = info.Swizzle();
+        if (IsFormatFlipped(format)) {
+            std::ranges::transform(swizzle, swizzle.begin(), SwapBlueRed);
+        }
         if ((aspect_mask & (VK_IMAGE_ASPECT_DEPTH_BIT | VK_IMAGE_ASPECT_STENCIL_BIT)) != 0) {
             std::ranges::transform(swizzle, swizzle.begin(), ConvertGreenRed);
         }