GL_SGIS_point_line_texgen http://www.opengl.org/registry/specs/gl/SGIS/point_line_texgen.txt GL_SGIS_point_line_texgen GL_EYE_DISTANCE_TO_POINT_SGIS 0x81F0 GL_OBJECT_DISTANCE_TO_POINT_SGIS 0x81F1 GL_EYE_DISTANCE_TO_LINE_SGIS 0x81F2 GL_OBJECT_DISTANCE_TO_LINE_SGIS 0x81F3 GL_EYE_POINT_SGIS 0x81F4 GL_OBJECT_POINT_SGIS 0x81F5 GL_EYE_LINE_SGIS 0x81F6 GL_OBJECT_LINE_SGIS 0x81F7