vertexCallback    606 lib/devices/opengl.c     gluTessCallback(i->tesselator, GLU_TESS_VERTEX, (callbackfunction_t)vertexCallback);
vertexCallback    613 lib/devices/opengl.c     gluTessCallback(i->tesselator_line, GLU_TESS_VERTEX, (callbackfunction_t)vertexCallback);