glutReportErrors - for debugging purposes; prints out OpenGL run-time errors.
void glutReportErrors(void);
This routine prints out any OpenGL run-time errors pending and clears the
errors. This routine typically should only be used for debugging purposes
since calling it will slow OpenGL programs. It is provided as a convenience;
all the routine does is call glGetError until no more errors are
reported. Any errors detected are reported with a GLUT warning and the
corresponding text message generated by gluErrorString.
Calling glutReportErrors repeatedly in your program can help
isolate OpenGL errors to the offending OpenGL command. Remember that you can
use the -gldebug option to detect OpenGL errors in any GLUT
program.
glutInit, glutCreateWindow, glutInitDisplayMode, gluErrorString, glGetError
Mark J. Kilgard (mjk@nvidia.com)