SKELETON GLUT PROGRAM

/* glutskel.c */

/*
 * A skeleton/template GLUT program
 */

#include <stdio.h >
#include <stdlib.h >
#include <math.h >
#include <GL/glut.h >



static void Idle( void )
{
   /* update animation vars --
	THIS ONLY MARKS THE CURR WINDOW FOR REDISPLAY! */
   glutPostRedisplay();
}



static void Display( void )
{
   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

   glPushMatrix();
   /* draw stuff here */

   glPopMatrix();

   glutSwapBuffers();
}



static void Reshape( int width, int height )
{
   /* width and height are in pixels */
   glViewport( 0, 0, width, height );
   glMatrixMode( GL_PROJECTION );
   glLoadIdentity();
   glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
   glMatrixMode( GL_MODELVIEW );
   glLoadIdentity();
   glTranslatef( 0.0, 0.0, -15.0 );
}



static void Key( unsigned char key, int x, int y )
{
   switch (key) {
      case 27:
         exit(0);
         break;
   }
   glutPostRedisplay();
}


   /* Special keys include the function keys (1-12),
	arrow directions, page up/down, home, end */

static void SpecialKey( int key, int x, int y )
{
   switch (key) {
      case GLUT_KEY_UP:
         break;
      case GLUT_KEY_DOWN:
         break;
      case GLUT_KEY_LEFT:
         break;
      case GLUT_KEY_RIGHT:
         break;
   }
   glutPostRedisplay();
}



static void Init( void )
{
   /* setup lighting, etc */
}



int main( int argc, char *argv[] )
{
   glutInit( &argc, argv ); // glutInit() has arguments like main()
   glutInitWindowSize( 400, 400 );

// So we want a color buffer, 
//  double buffering and z-buffering: 
   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );

// Get a top level window: 
   glutCreateWindow(argv[0]);

   Init();

// Now we register callback functions:
   glutReshapeFunc( Reshape );
   glutKeyboardFunc( Key );
   glutSpecialFunc( SpecialKey );
   glutDisplayFunc( Display );
   glutIdleFunc( Idle );

   glutMainLoop(); // This is always the last glut
		   // command to call -- it does not return. 
}