Added a utility function to determine if a dxgi format is compressed.

src/libGLESv2/renderer/renderer11_utils.cpp

@@ -570,6 +570,40 @@ size_t ComputeBlockSizeBits(DXGI_FORMAT format)
     }
 }
 
+bool IsCompressed(DXGI_FORMAT format)
+{
+    switch (format)
+    {
+      case DXGI_FORMAT_BC1_TYPELESS:
+      case DXGI_FORMAT_BC1_UNORM:
+      case DXGI_FORMAT_BC1_UNORM_SRGB:
+      case DXGI_FORMAT_BC4_SNORM:
+      case DXGI_FORMAT_BC4_TYPELESS:
+      case DXGI_FORMAT_BC4_UNORM:
+      case DXGI_FORMAT_BC2_TYPELESS:
+      case DXGI_FORMAT_BC2_UNORM:
+      case DXGI_FORMAT_BC2_UNORM_SRGB:
+      case DXGI_FORMAT_BC3_TYPELESS:
+      case DXGI_FORMAT_BC3_UNORM:
+      case DXGI_FORMAT_BC3_UNORM_SRGB:
+      case DXGI_FORMAT_BC5_SNORM:
+      case DXGI_FORMAT_BC5_TYPELESS:
+      case DXGI_FORMAT_BC5_UNORM:
+      case DXGI_FORMAT_BC6H_SF16:
+      case DXGI_FORMAT_BC6H_TYPELESS:
+      case DXGI_FORMAT_BC6H_UF16:
+      case DXGI_FORMAT_BC7_TYPELESS:
+      case DXGI_FORMAT_BC7_UNORM:
+      case DXGI_FORMAT_BC7_UNORM_SRGB:
+        return true;
+      case DXGI_FORMAT_UNKNOWN:
+        UNREACHABLE();
+        return false;
+      default:
+        return false;
+    }
+}
+
 unsigned int GetTextureFormatDimensionAlignment(DXGI_FORMAT format)
 {
     switch (format)

src/libGLESv2/renderer/renderer11_utils.h

@@ -66,6 +66,7 @@ void SetPositionDepthColorVertex(PositionDepthColorVertex* vertex, float x, floa
 size_t ComputePixelSizeBits(DXGI_FORMAT format);
 size_t ComputeBlockSizeBits(DXGI_FORMAT format);
 
+bool IsCompressed(DXGI_FORMAT format);
 unsigned int GetTextureFormatDimensionAlignment(DXGI_FORMAT format);
 
 bool IsDepthStencilFormat(DXGI_FORMAT format);