1GL_SGIS_point_line_texgen 2http://www.opengl.org/registry/specs/SGIS/point_line_texgen.txt 3GL_SGIS_point_line_texgen 4 GL_EYE_DISTANCE_TO_POINT_SGIS 0x81F0 5 GL_OBJECT_DISTANCE_TO_POINT_SGIS 0x81F1 6 GL_EYE_DISTANCE_TO_LINE_SGIS 0x81F2 7 GL_OBJECT_DISTANCE_TO_LINE_SGIS 0x81F3 8 GL_EYE_POINT_SGIS 0x81F4 9 GL_OBJECT_POINT_SGIS 0x81F5 10 GL_EYE_LINE_SGIS 0x81F6 11 GL_OBJECT_LINE_SGIS 0x81F7 12