GL_ATIX_point_sprites
http://www.ati.com/developer/atiopengl.pdf
	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