1GL_NV_texgen_emboss 2http://www.opengl.org/registry/specs/NV/texgen_emboss.txt 3GL_NV_texgen_emboss 4 GL_EMBOSS_LIGHT_NV 0x855D 5 GL_EMBOSS_CONSTANT_NV 0x855E 6 GL_EMBOSS_MAP_NV 0x855F 7