| GL_ARB_depth_texture | |
| http://oss.sgi.com/projects/ogl-sample/registry/ARB/depth_texture.txt | |
| GL_DEPTH_COMPONENT16_ARB 0x81A5 | |
| GL_DEPTH_COMPONENT24_ARB 0x81A6 | |
| GL_DEPTH_COMPONENT32_ARB 0x81A7 | |
| GL_TEXTURE_DEPTH_SIZE_ARB 0x884A | |
| GL_DEPTH_TEXTURE_MODE_ARB 0x884B |