| GL_SGIX_texture_scale_bias | |
| http://oss.sgi.com/projects/ogl-sample/registry/SGIX/texture_scale_bias.txt | |
| GL_POST_TEXTURE_FILTER_BIAS_SGIX 0x8179 | |
| GL_POST_TEXTURE_FILTER_SCALE_SGIX 0x817A | |
| GL_POST_TEXTURE_FILTER_BIAS_RANGE_SGIX 0x817B | |
| GL_POST_TEXTURE_FILTER_SCALE_RANGE_SGIX 0x817C |