Cache the index ranges at the gl::Buffer and rx::IndexBuffer levels so that ranges do not need to be re-calculated for direct buffers.

Issue #451

Signed-off-by: Jamie Madill
Signed-off-by: Shannon Woods
Author: Geoff Lang
diff --git a/src/libGLESv2/formatutils.h b/src/libGLESv2/formatutils.h
index 7c0890b..ce038a3 100644
--- a/src/libGLESv2/formatutils.h
+++ b/src/libGLESv2/formatutils.h
@@ -59,6 +59,9 @@
 GLuint GetDepthBits(GLint internalFormat, GLuint clientVersion);
 GLuint GetStencilBits(GLint internalFormat, GLuint clientVersion);
 
+GLuint GetTypeBytes(GLenum type);
+bool IsSpecialInterpretationType(GLenum type);
+
 GLenum GetFormat(GLint internalFormat, GLuint clientVersion);
 GLenum GetType(GLint internalFormat, GLuint clientVersion);