Add compressed texture capabilities for GPU devices

include/gpu/GrTypes.h

Index: include/gpu/GrTypes.h
diff --git a/include/gpu/GrTypes.h b/include/gpu/GrTypes.h
index c1b3554c6e008eb322d18838618a53cbeeb54495..67c8f87e762f24368f7a44b2cd7737e270c415f5 100644
--- a/include/gpu/GrTypes.h
+++ b/include/gpu/GrTypes.h
@@ -620,6 +620,19 @@ enum GrGLBackendState {
 };
 
 /**
+ * The compressed texture formats that may be supported by the renderer.
+ * Make sure to check for the required capabilities using
+ * GrDrawTargetCaps::compressedTextureSupport

[bsalomon, 2014/05/23 13:40:04]

Maybe we should throw the 8bit index format in here.

[krajcevski, 2014/05/23 15:11:46]

For paletted textures, OpenGL ES uses glCompressedTexImage2D but OpenGL uses
glTexImage2D. It seems like it would be better to keep them separate, i.e.
GrCompressedFormat should be the ETC1/2, DXT1, etc.

Conversely, we could add the compressed formats to GrPixelConfig

+ */
+enum GrCompressedFormat {
+    kUncompressed_GrCompressedFormat = -1,

[bsalomon, 2014/05/23 13:40:04]

Is this used anywhere? Or is it related to a coming CL?

[krajcevski, 2014/05/23 15:11:46]

It will be used to denote uncompressed textures in GrTextureDesc in an upcoming
CL.

+    kETC1_GrCompressedFormat         =  0,
+
+    kLast_GrCompressedFormat = kETC1_GrCompressedFormat
+};
+static const size_t kCompressedFormatCount = kLast_GrCompressedFormat + 1;
+
+/**
  * This value translates to reseting all the context state for any backend.
  */
 static const uint32_t kAll_GrBackendState = 0xffffffff;