/******************************************************
**  Demo Program for glGetError
**  Intentially causes an error.
**
**  R.S. Dannelly
*****************************************************/
#include <GL/glut.h>
#include <stdlib.h>

/********************************************************/
void display(void)
{
   GLenum  errcode;   // var for error code number

   glClearColor (0.0, 0.0, 0.0, 0.0); 
   glClear(GL_COLOR_BUFFER_BIT);
   glPushMatrix();

   glColor3f (1.0, 0.5, 0.6);
   glRotatef (45.0, 1,1,1);
   glTranslatef (20,20,0);
   glutSolidDodecahedron ();

   glPopMatrix();
   glPopMatrix();                // error

   glColor3f (1.9, -0.5, -0.6);  // not an error?
   glTranslatef (-20,-20,0);
   glScalef  (5,5,5);
   glutWireDodecahedron ();
   glFlush();

   while ((errcode = glGetError()) != GL_NO_ERROR)
        printf("OpenGL Error: %s\n", gluErrorString(errcode));
}

/********************************************************/

void reshape(int w, int h)
{
   glViewport (0, 0, (GLsizei) w, (GLsizei) h);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   glOrtho(-50.0, 50.0, -50.0, 50.0, -50.0, 50.0);
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
}
/****** exit on mouse click  **************************/
void mouse(int button, int state, int x, int y)
{
   if (state == GLUT_DOWN)
      exit(1);
}
/********************************************************/
 
int main(int argc, char** argv)
{
   glutInit(&argc, argv);
   glutInitDisplayMode (GLUT_RGB);
   glutInitWindowSize (450, 450); 
   glutInitWindowPosition (100, 100);
   glutCreateWindow (argv[0]);
   glutDisplayFunc(display); 
   glutReshapeFunc(reshape); 
   glutMouseFunc(mouse);
   glutMainLoop();
   return 0;  
}