GL_ATIX_point_sprites
http://www.ati.com/developer/atiopengl.pdf
GL_ATIX_point_sprites
GL_TEXTURE_POINT_MODE_ATIX 0x60B0
GL_TEXTURE_POINT_ONE_COORD_ATIX 0x60B1
GL_TEXTURE_POINT_SPRITE_ATIX 0x60B2
GL_POINT_SPRITE_CULL_MODE_ATIX 0x60B3
GL_POINT_SPRITE_CULL_CENTER_ATIX 0x60B4
GL_POINT_SPRITE_CULL_CLIP_ATIX 0x60B5