1GL_SGIS_point_line_texgen 2http://www.opengl.org/registry/specs/SGIS/point_line_texgen.txt 3GL_SGIS_point_line_texgen 4 5 GL_EYE_DISTANCE_TO_POINT_SGIS 0x81F0 6 GL_OBJECT_DISTANCE_TO_POINT_SGIS 0x81F1 7 GL_EYE_DISTANCE_TO_LINE_SGIS 0x81F2 8 GL_OBJECT_DISTANCE_TO_LINE_SGIS 0x81F3 9 GL_EYE_POINT_SGIS 0x81F4 10 GL_OBJECT_POINT_SGIS 0x81F5 11 GL_EYE_LINE_SGIS 0x81F6 12 GL_OBJECT_LINE_SGIS 0x81F7 13