GL_EXT_texture_sRGB_decode http://www.opengl.org/registry/specs/EXT/texture_sRGB_decode.txt GL_EXT_texture_sRGB_decode GL_TEXTURE_SRGB_DECODE_EXT 0x8A48 GL_DECODE_EXT 0x8A49 GL_SKIP_DECODE_EXT 0x8A4A