Graphics Accessories: added BCFormatToUncompressed function

Author: TheMostDiligent

Graphics/GraphicsAccessories/interface/GraphicsAccessories.hpp

@@ -767,10 +767,22 @@ String GetShaderResourcePrintName(const DescType& ResDesc, Uint32 ArrayIndex = 0
     return GetShaderResourcePrintName(ResDesc.Name, ResDesc.ArraySize, ArrayIndex);
 }
 
+/// Converts UNORM format to a corresponding SRGB format, for example:
+///   RGBA8_UNORM -> RGBA8_UNORM_SRGB
+///   BC3_UNORM -> BC3_UNORM_SRGB
 TEXTURE_FORMAT UnormFormatToSRGB(TEXTURE_FORMAT Fmt);
 
+/// Converts SRGB format to a corresponding UNORM format, for example:
+///   RGBA8_UNORM_SRGB -> RGBA8_UNORM
+///   BC3_UNORM_SRGB -> BC3_UNORM
 TEXTURE_FORMAT SRGBFormatToUnorm(TEXTURE_FORMAT Fmt);
 
+/// Converts block-compressed format to a corresponding uncompressed format, for example:
+///   BC1_UNORM -> RGBA8_UNORM
+///   BC4_UNORM -> R8_UNORM
+TEXTURE_FORMAT BCFormatToUncompressed(TEXTURE_FORMAT Fmt);
+
+
 bool IsSRGBFormat(TEXTURE_FORMAT Fmt);
 
 String GetPipelineShadingRateFlagsString(PIPELINE_SHADING_RATE_FLAGS Flags);

Graphics/GraphicsAccessories/src/GraphicsAccessories.cpp

@@ -2603,6 +2603,55 @@ TEXTURE_FORMAT SRGBFormatToUnorm(TEXTURE_FORMAT Fmt)
     }
 }
 
+TEXTURE_FORMAT BCFormatToUncompressed(TEXTURE_FORMAT Fmt)
+{
+    switch (Fmt)
+    {
+        // RGB 5:6:5 + 1 bit alpha
+        case TEX_FORMAT_BC1_TYPELESS:
+            return TEX_FORMAT_RGBA8_TYPELESS;
+        case TEX_FORMAT_BC1_UNORM:
+            return TEX_FORMAT_RGBA8_UNORM;
+        case TEX_FORMAT_BC1_UNORM_SRGB:
+            return TEX_FORMAT_RGBA8_UNORM_SRGB;
+
+        // RGB 5:6:5 + 4 bit alpha
+        case TEX_FORMAT_BC2_TYPELESS:
+            return TEX_FORMAT_RGBA8_TYPELESS;
+        case TEX_FORMAT_BC2_UNORM:
+            return TEX_FORMAT_RGBA8_UNORM;
+        case TEX_FORMAT_BC2_UNORM_SRGB:
+            return TEX_FORMAT_RGBA8_UNORM_SRGB;
+
+        // RGB 5:6:5 + 8 bit alpha
+        case TEX_FORMAT_BC3_TYPELESS:
+            return TEX_FORMAT_RGBA8_TYPELESS;
+        case TEX_FORMAT_BC3_UNORM:
+            return TEX_FORMAT_RGBA8_UNORM;
+        case TEX_FORMAT_BC3_UNORM_SRGB:
+            return TEX_FORMAT_RGBA8_UNORM_SRGB;
+
+        // R8
+        case TEX_FORMAT_BC4_TYPELESS:
+            return TEX_FORMAT_R8_TYPELESS;
+        case TEX_FORMAT_BC4_UNORM:
+            return TEX_FORMAT_R8_UNORM;
+        case TEX_FORMAT_BC4_SNORM:
+            return TEX_FORMAT_R8_SNORM;
+
+        // RG 8:8
+        case TEX_FORMAT_BC5_TYPELESS:
+            return TEX_FORMAT_RG8_TYPELESS;
+        case TEX_FORMAT_BC5_UNORM:
+            return TEX_FORMAT_RG8_UNORM;
+        case TEX_FORMAT_BC5_SNORM:
+            return TEX_FORMAT_RG8_SNORM;
+
+        default:
+            return TEX_FORMAT_UNKNOWN;
+    }
+}
+
 bool IsSRGBFormat(TEXTURE_FORMAT Fmt)
 {
     return (Fmt == TEX_FORMAT_RGBA8_UNORM_SRGB ||