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GL_ATI_separate_stencil
http://www.opengl.org/registry/specs/ATI/separate_stencil.txt
GL_ATI_separate_stencil
	GL_STENCIL_BACK_FUNC_ATI 0x8800
	GL_STENCIL_BACK_FAIL_ATI 0x8801
	GL_STENCIL_BACK_PASS_DEPTH_FAIL_ATI 0x8802
	GL_STENCIL_BACK_PASS_DEPTH_PASS_ATI 0x8803
	void glStencilOpSeparateATI (GLenum face, GLenum sfail, GLenum dpfail, GLenum dppass)
	void glStencilFuncSeparateATI (GLenum frontfunc, GLenum backfunc, GLint ref, GLuint mask)