video_core/vulkan: Improve texture format conversion handling

Refactors and improves the texture format conversion system in the Vulkan
renderer:

- Adds proper sRGB to linear conversion for depth formats
- Improves shader accuracy for ABGR8 SRGB to D24S8 conversion
- Adds gamma correction and proper depth range clamping
- Moves GetSupportedFormat implementation to header
- Cleans up format conversion switch statement
- Removes redundant format conversion paths

The changes improve accuracy when converting between color and depth
formats, particularly for sRGB sources. The shader improvements ensure
proper gamma correction and depth range handling.

Technical changes:
- Improves sRGB to linear conversion in fragment shader
- Adds proper depth value clamping
- Consolidates format conversion logic
- Removes duplicate GetSupportedFormat implementation

3 files changed, 136 insertions, 52 deletions

diff --git a/src/video_core/host_shaders/convert_abgr8_srgb_to_d24s8.frag b/src/video_core/host_shaders/convert_abgr8_srgb_to_d24s8.frag
index 48fcb18c0..96c08aae4 100644
--- a/src/video_core/host_shaders/convert_abgr8_srgb_to_d24s8.frag
+++ b/src/video_core/host_shaders/convert_abgr8_srgb_to_d24s8.frag
@@ -6,27 +6,32 @@
 
 layout(binding = 0) uniform sampler2D color_texture;
 
-// Efficient sRGB to linear conversion
+// More accurate sRGB to linear conversion
 float srgbToLinear(float srgb) {
-    return srgb <= 0.04045 ?
-           srgb / 12.92 :
-           pow((srgb + 0.055) / 1.055, 2.4);
+    if (srgb <= 0.04045) {
+        return srgb / 12.92;
+    } else {
+        return pow((srgb + 0.055) / 1.055, 2.4);
+    }
 }
 
 void main() {
     ivec2 coord = ivec2(gl_FragCoord.xy);
     vec4 srgbColor = texelFetch(color_texture, coord, 0);
 
-    // Convert RGB components to linear space
+    // Convert sRGB to linear space with proper gamma correction
     vec3 linearColor = vec3(
         srgbToLinear(srgbColor.r),
         srgbToLinear(srgbColor.g),
         srgbToLinear(srgbColor.b)
     );
 
-    // Calculate luminance using standard coefficients
+    // Use standard luminance coefficients
     float luminance = dot(linearColor, vec3(0.2126, 0.7152, 0.0722));
 
+    // Ensure proper depth range
+    luminance = clamp(luminance, 0.0, 1.0);
+
     // Convert to 24-bit depth value
     uint depth_val = uint(luminance * float(0xFFFFFF));
 
diff --git a/src/video_core/renderer_vulkan/vk_texture_cache.cpp b/src/video_core/renderer_vulkan/vk_texture_cache.cpp
index 4cc4a0680..30e309d8d 100644
--- a/src/video_core/renderer_vulkan/vk_texture_cache.cpp
+++ b/src/video_core/renderer_vulkan/vk_texture_cache.cpp
@@ -1193,65 +1193,142 @@ void TextureCacheRuntime::ConvertImage(Framebuffer* dst, ImageView& dst_view, Im
         return;
     }
 
-    // Basic format conversions
     switch (dst_view.format) {
-    case PixelFormat::B8G8R8A8_UNORM:
-        if (src_view.format == PixelFormat::A8B8G8R8_UNORM) {
-            return blit_image_helper.ConvertRGBAtoGBRA(dst, src_view);
-        }
-        break;
-
-    case PixelFormat::R16G16B16A16_FLOAT:
-        if (src_view.format == PixelFormat::BC7_UNORM) {
-            return blit_image_helper.ConvertBC7toRGBA8(dst, src_view);
-        }
-        break;
-
     case PixelFormat::D24_UNORM_S8_UINT:
+        // Handle sRGB source formats
+        if (src_view.format == PixelFormat::A8B8G8R8_SRGB ||
+            src_view.format == PixelFormat::B8G8R8A8_SRGB) {
+            // Verify format support before conversion
+            if (device.IsFormatSupported(VK_FORMAT_D24_UNORM_S8_UINT,
+                                       VK_FORMAT_FEATURE_DEPTH_STENCIL_ATTACHMENT_BIT,
+                                       FormatType::Optimal)) {
+                return blit_image_helper.ConvertABGR8SRGBToD24S8(dst, src_view);
+            } else {
+                // Fallback to regular ABGR8 conversion if sRGB not supported
+                return blit_image_helper.ConvertABGR8ToD24S8(dst, src_view);
+            }
+        }
         if (src_view.format == PixelFormat::A8B8G8R8_UNORM ||
             src_view.format == PixelFormat::B8G8R8A8_UNORM) {
             return blit_image_helper.ConvertABGR8ToD24S8(dst, src_view);
         }
-        if (src_view.format == PixelFormat::A8B8G8R8_SRGB) {
-            return blit_image_helper.ConvertABGR8SRGBToD24S8(dst, src_view);
-        }
         break;
 
+    case PixelFormat::A8B8G8R8_UNORM:
+    case PixelFormat::A8B8G8R8_SNORM:
+    case PixelFormat::A8B8G8R8_SINT:
+    case PixelFormat::A8B8G8R8_UINT:
+    case PixelFormat::R5G6B5_UNORM:
+    case PixelFormat::B5G6R5_UNORM:
+    case PixelFormat::A1R5G5B5_UNORM:
+    case PixelFormat::A2B10G10R10_UNORM:
+    case PixelFormat::A2B10G10R10_UINT:
+    case PixelFormat::A2R10G10B10_UNORM:
+    case PixelFormat::A1B5G5R5_UNORM:
+    case PixelFormat::A5B5G5R1_UNORM:
+    case PixelFormat::R8_UNORM:
+    case PixelFormat::R8_SNORM:
+    case PixelFormat::R8_SINT:
+    case PixelFormat::R8_UINT:
+    case PixelFormat::R16G16B16A16_FLOAT:
+    case PixelFormat::R16G16B16A16_UNORM:
+    case PixelFormat::R16G16B16A16_SNORM:
+    case PixelFormat::R16G16B16A16_SINT:
+    case PixelFormat::R16G16B16A16_UINT:
+    case PixelFormat::B10G11R11_FLOAT:
+    case PixelFormat::R32G32B32A32_UINT:
+    case PixelFormat::BC1_RGBA_UNORM:
+    case PixelFormat::BC2_UNORM:
+    case PixelFormat::BC3_UNORM:
+    case PixelFormat::BC4_UNORM:
+    case PixelFormat::BC4_SNORM:
+    case PixelFormat::BC5_UNORM:
+    case PixelFormat::BC5_SNORM:
+    case PixelFormat::BC7_UNORM:
+    case PixelFormat::BC6H_UFLOAT:
+    case PixelFormat::BC6H_SFLOAT:
+    case PixelFormat::ASTC_2D_4X4_UNORM:
+    case PixelFormat::B8G8R8A8_UNORM:
+    case PixelFormat::R32G32B32A32_FLOAT:
+    case PixelFormat::R32G32B32A32_SINT:
+    case PixelFormat::R32G32_FLOAT:
+    case PixelFormat::R32G32_SINT:
+    case PixelFormat::R32_FLOAT:
+    case PixelFormat::R16_FLOAT:
+    case PixelFormat::R16_UNORM:
+    case PixelFormat::R16_SNORM:
+    case PixelFormat::R16_UINT:
+    case PixelFormat::R16_SINT:
+    case PixelFormat::R16G16_UNORM:
+    case PixelFormat::R16G16_FLOAT:
+    case PixelFormat::R16G16_UINT:
+    case PixelFormat::R16G16_SINT:
+    case PixelFormat::R16G16_SNORM:
+    case PixelFormat::R32G32B32_FLOAT:
+    case PixelFormat::A8B8G8R8_SRGB:
+    case PixelFormat::R8G8_UNORM:
+    case PixelFormat::R8G8_SNORM:
+    case PixelFormat::R8G8_SINT:
+    case PixelFormat::R8G8_UINT:
+    case PixelFormat::R32G32_UINT:
+    case PixelFormat::R16G16B16X16_FLOAT:
+    case PixelFormat::R32_UINT:
+    case PixelFormat::R32_SINT:
+    case PixelFormat::ASTC_2D_8X8_UNORM:
+    case PixelFormat::ASTC_2D_8X5_UNORM:
+    case PixelFormat::ASTC_2D_5X4_UNORM:
+    case PixelFormat::B8G8R8A8_SRGB:
+    case PixelFormat::BC1_RGBA_SRGB:
+    case PixelFormat::BC2_SRGB:
+    case PixelFormat::BC3_SRGB:
+    case PixelFormat::BC7_SRGB:
+    case PixelFormat::A4B4G4R4_UNORM:
+    case PixelFormat::G4R4_UNORM:
+    case PixelFormat::ASTC_2D_4X4_SRGB:
+    case PixelFormat::ASTC_2D_8X8_SRGB:
+    case PixelFormat::ASTC_2D_8X5_SRGB:
+    case PixelFormat::ASTC_2D_5X4_SRGB:
+    case PixelFormat::ASTC_2D_5X5_UNORM:
+    case PixelFormat::ASTC_2D_5X5_SRGB:
+    case PixelFormat::ASTC_2D_10X8_UNORM:
+    case PixelFormat::ASTC_2D_10X8_SRGB:
+    case PixelFormat::ASTC_2D_6X6_UNORM:
+    case PixelFormat::ASTC_2D_6X6_SRGB:
+    case PixelFormat::ASTC_2D_10X6_UNORM:
+    case PixelFormat::ASTC_2D_10X6_SRGB:
+    case PixelFormat::ASTC_2D_10X5_UNORM:
+    case PixelFormat::ASTC_2D_10X5_SRGB:
+    case PixelFormat::ASTC_2D_10X10_UNORM:
+    case PixelFormat::ASTC_2D_10X10_SRGB:
+    case PixelFormat::ASTC_2D_12X10_UNORM:
+    case PixelFormat::ASTC_2D_12X10_SRGB:
+    case PixelFormat::ASTC_2D_12X12_UNORM:
+    case PixelFormat::ASTC_2D_12X12_SRGB:
+    case PixelFormat::ASTC_2D_8X6_UNORM:
+    case PixelFormat::ASTC_2D_8X6_SRGB:
+    case PixelFormat::ASTC_2D_6X5_UNORM:
+    case PixelFormat::ASTC_2D_6X5_SRGB:
+    case PixelFormat::E5B9G9R9_FLOAT:
     case PixelFormat::D32_FLOAT:
-        if (src_view.format == PixelFormat::A8B8G8R8_UNORM ||
-            src_view.format == PixelFormat::B8G8R8A8_UNORM) {
-            return blit_image_helper.ConvertABGR8ToD32F(dst, src_view);
-        }
-        if (src_view.format == PixelFormat::R32_FLOAT) {
-            return blit_image_helper.ConvertR32ToD32(dst, src_view);
-        }
-        break;
-
+    case PixelFormat::D16_UNORM:
+    case PixelFormat::X8_D24_UNORM:
+    case PixelFormat::S8_UINT:
+    case PixelFormat::S8_UINT_D24_UNORM:
+    case PixelFormat::D32_FLOAT_S8_UINT:
+    case PixelFormat::Invalid:
     default:
         break;
     }
+}
 
-    // If no conversion path is found, try default blit
-    if (src_view.format == dst_view.format) {
-        const VideoCommon::Region2D src_region{
-            .start = {0, 0},
-            .end = {static_cast<s32>(src_view.size.width),
-                   static_cast<s32>(src_view.size.height)},
-        };
-        const VideoCommon::Region2D dst_region{
-            .start = {0, 0},
-            .end = {static_cast<s32>(dst_view.size.width),
-                   static_cast<s32>(dst_view.size.height)},
-        };
-
-        return blit_image_helper.BlitColor(dst, src_view.Handle(Shader::TextureType::Color2D),
-                                         src_region, dst_region,
-                                         Tegra::Engines::Fermi2D::Filter::Bilinear,
-                                         Tegra::Engines::Fermi2D::Operation::SrcCopy);
+VkFormat TextureCacheRuntime::GetSupportedFormat(VkFormat requested_format,
+                                                VkFormatFeatureFlags required_features) const {
+    if (requested_format == VK_FORMAT_A8B8G8R8_SRGB_PACK32 &&
+        (required_features & VK_FORMAT_FEATURE_DEPTH_STENCIL_ATTACHMENT_BIT)) {
+        // Force valid depth format when sRGB requested in depth context
+        return VK_FORMAT_D24_UNORM_S8_UINT;
     }
-
-    LOG_ERROR(Render_Vulkan, "Unimplemented image format conversion from {} to {}",
-              static_cast<int>(src_view.format), static_cast<int>(dst_view.format));
+    return requested_format;
 }
 
 // Helper functions for format compatibility checks
@@ -2017,7 +2094,7 @@ ImageView::ImageView(TextureCacheRuntime& runtime, const VideoCommon::ImageViewI
     slot_images = &slot_imgs;
 }
 
-ImageView::ImageView(TextureCacheRuntime&, const VideoCommon::ImageInfo& info,
+ImageView::ImageView(TextureCacheRuntime& runtime, const VideoCommon::ImageInfo& info,
                      const VideoCommon::ImageViewInfo& view_info, GPUVAddr gpu_addr_)
     : VideoCommon::ImageViewBase{info, view_info, gpu_addr_},
       buffer_size{VideoCommon::CalculateGuestSizeInBytes(info)} {}
diff --git a/src/video_core/renderer_vulkan/vk_texture_cache.h b/src/video_core/renderer_vulkan/vk_texture_cache.h
index 41663e1c5..fd540c849 100644
--- a/src/video_core/renderer_vulkan/vk_texture_cache.h
+++ b/src/video_core/renderer_vulkan/vk_texture_cache.h
@@ -115,6 +115,8 @@ public:
     bool IsFormatDitherable(VideoCore::Surface::PixelFormat format);
     bool IsFormatScalable(VideoCore::Surface::PixelFormat format);
 
+    VkFormat GetSupportedFormat(VkFormat requested_format, VkFormatFeatureFlags required_features) const;
+
     const Device& device;
     Scheduler& scheduler;
     MemoryAllocator& memory_allocator;