| GL_SGIX_async_pixel | |
| http://oss.sgi.com/projects/ogl-sample/registry/SGIX/async_pixel.txt | |
| GL_ASYNC_TEX_IMAGE_SGIX 0x835C | |
| GL_ASYNC_DRAW_PIXELS_SGIX 0x835D | |
| GL_ASYNC_READ_PIXELS_SGIX 0x835E | |
| GL_MAX_ASYNC_TEX_IMAGE_SGIX 0x835F | |
| GL_MAX_ASYNC_DRAW_PIXELS_SGIX 0x8360 | |
| GL_MAX_ASYNC_READ_PIXELS_SGIX 0x8361 |