Fix storage image write of VK_FORMAT_B8G8R8A8_SRGB

This format has VK_FORMAT_FEATURE_2_STORAGE_WRITE_WITHOUT_FORMAT_BIT
support claimed, but was not actually handled.

It is identical to VK_FORMAT_B8G8R8A8_UNORM except a linear-to-sRGB
color space conversion takes place.

Bug: b/224796232
Change-Id: I6d914550a5e68c67d4877fd81ce065ef135fdd24
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/64888
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>

src/Pipeline/SpirvShaderImage.cpp

diff --git a/src/Pipeline/SpirvShaderImage.cpp b/src/Pipeline/SpirvShaderImage.cpp
index 9f224d4..7adf2c7 100644
--- a/src/Pipeline/SpirvShaderImage.cpp
+++ b/src/Pipeline/SpirvShaderImage.cpp
@@ -1227,6 +1227,12 @@
 		            ((SIMD::UInt(Round(Min(Max(As<SIMD::Float>(texel[0]), SIMD::Float(0.0f)), SIMD::Float(1.0f)) * SIMD::Float(255.0f)))) << 16) |
 		            ((SIMD::UInt(Round(Min(Max(As<SIMD::Float>(texel[3]), SIMD::Float(0.0f)), SIMD::Float(1.0f)) * SIMD::Float(255.0f)))) << 24);
 		break;
+	case VK_FORMAT_B8G8R8A8_SRGB:
+		packed[0] = (SIMD::UInt(Round(Min(Max(linearToSRGB(As<SIMD::Float>(texel[2])), SIMD::Float(0.0f)), SIMD::Float(1.0f)) * SIMD::Float(255.0f)))) |
+		            ((SIMD::UInt(Round(Min(Max(linearToSRGB(As<SIMD::Float>(texel[1])), SIMD::Float(0.0f)), SIMD::Float(1.0f)) * SIMD::Float(255.0f)))) << 8) |
+		            ((SIMD::UInt(Round(Min(Max(linearToSRGB(As<SIMD::Float>(texel[0])), SIMD::Float(0.0f)), SIMD::Float(1.0f)) * SIMD::Float(255.0f)))) << 16) |
+		            ((SIMD::UInt(Round(Min(Max(linearToSRGB(As<SIMD::Float>(texel[3])), SIMD::Float(0.0f)), SIMD::Float(1.0f)) * SIMD::Float(255.0f)))) << 24);
+		break;
 	case VK_FORMAT_R8G8B8A8_SNORM:
 	case VK_FORMAT_A8B8G8R8_SNORM_PACK32:
 		packed[0] = (SIMD::Int(Round(Min(Max(As<SIMD::Float>(texel[0]), SIMD::Float(-1.0f)), SIMD::Float(1.0f)) * SIMD::Float(127.0f))) &

src/Vulkan/VkPhysicalDevice.cpp

diff --git a/src/Vulkan/VkPhysicalDevice.cpp b/src/Vulkan/VkPhysicalDevice.cpp
index 1881234..5369175 100644
--- a/src/Vulkan/VkPhysicalDevice.cpp
+++ b/src/Vulkan/VkPhysicalDevice.cpp
@@ -1779,7 +1779,7 @@
 	case VK_FORMAT_B8G8R8A8_SRGB:
 		pFormatProperties->optimalTilingFeatures |=
 		    VK_FORMAT_FEATURE_STORAGE_IMAGE_BIT |
-		    VK_FORMAT_FEATURE_2_STORAGE_WRITE_WITHOUT_FORMAT_BIT_KHR;
+		    VK_FORMAT_FEATURE_2_STORAGE_WRITE_WITHOUT_FORMAT_BIT;
 		pFormatProperties->bufferFeatures |=
 		    VK_FORMAT_FEATURE_STORAGE_TEXEL_BUFFER_BIT;
 		break;