GL_3DFX_texture_compression_FXT1 http://www.opengl.org/registry/specs/gl/3DFX/texture_compression_FXT1.txt GL_3DFX_texture_compression_FXT1 GL_COMPRESSED_RGB_FXT1_3DFX 0x86B0 GL_COMPRESSED_RGBA_FXT1_3DFX 0x86B1