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GL_NV_texgen_emboss
http://www.opengl.org/registry/specs/NV/texgen_emboss.txt
GL_NV_texgen_emboss
	GL_EMBOSS_LIGHT_NV 0x855D
	GL_EMBOSS_CONSTANT_NV 0x855E
	GL_EMBOSS_MAP_NV 0x855F