gistfile1.txt

// check for GL errors and print them to stderr
inline void glError(const char* location)
{
	GLenum e;
	e = glGetError();
	if (e != GL_NO_ERROR)
	{
		fprintf (stderr, "ERROR!!! %s, %s\n", location, gluErrorString(e));
		e = glGetError();
		while (e != GL_NO_ERROR)
		{
			fprintf (stderr, "ERROR!!! %s, %s\n", location, gluErrorString(e));
			e = glGetError();
		}
	}
	// only uncomment this if you are super paranoid
	//else fprintf (stderr, "no error %s\n", location);
}