GL_EXT_texture_sRGB http://www.opengl.org/registry/specs/EXT/texture_sRGB.txt GL_EXT_texture_sRGB GL_SRGB_EXT 0x8C40 GL_SRGB8_EXT 0x8C41 GL_SRGB_ALPHA_EXT 0x8C42 GL_SRGB8_ALPHA8_EXT 0x8C43 GL_SLUMINANCE_ALPHA_EXT 0x8C44 GL_SLUMINANCE8_ALPHA8_EXT 0x8C45 GL_SLUMINANCE_EXT 0x8C46 GL_SLUMINANCE8_EXT 0x8C47 GL_COMPRESSED_SRGB_EXT 0x8C48 GL_COMPRESSED_SRGB_ALPHA_EXT 0x8C49 GL_COMPRESSED_SLUMINANCE_EXT 0x8C4A GL_COMPRESSED_SLUMINANCE_ALPHA_EXT 0x8C4B GL_COMPRESSED_SRGB_S3TC_DXT1_EXT 0x8C4C GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT 0x8C4D GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT 0x8C4E GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT 0x8C4F