GL_EXT_sRGB http://www.opengl.org/registry/specs/EXT/sRGB.txt GL_EXT_sRGB GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT 0x8210 GL_SRGB_EXT 0x8C40 GL_SRGB_ALPHA_EXT 0x8C42 GL_SRGB8_ALPHA8_EXT 0x8C43