An Interactive Introduction to OpenGL Programming

An OpenGL Program
(cont’d.)
void init( void )
{
glClearColor( 0, 0, 0, 1 );
gluLookAt( 2, 2, 2, 0, 0, 0, 0, 1, 0 );
glEnable( GL_DEPTH_TEST );
}
Set up some initial
OpenGL state
void reshape( int width, int height )
{
glViewport( 0, 0, width, height );
glMatrixMode( GL_PROJECTION );
Handle when the
glLoadIdentity();
user resizes the
gluPerspective( 60, (GLdouble) width / height, window
1.0, 10.0 );
glMatrixMode( GL_MODELVIEW );
}