GL_3DFX_multisample
http://oss.sgi.com/projects/ogl-sample/registry/3DFX/3dfx_multisample.txt
	GL_MULTISAMPLE_3DFX 0x86B2
	GL_SAMPLE_BUFFERS_3DFX 0x86B3
	GL_SAMPLES_3DFX 0x86B4
	GL_MULTISAMPLE_BIT_3DFX 0x20000000