+ glPushAttrib( GL_TRANSFORM_BIT );
+ glMatrixMode( GL_MODELVIEW );
+ glPushMatrix( );
+ glLoadIdentity( );
+ glMatrixMode( GL_PROJECTION );
+ glPushMatrix( );
+ glLoadIdentity( );
+ glOrtho(
+ 0, glutGet( GLUT_WINDOW_WIDTH ),
+ 0, glutGet( GLUT_WINDOW_HEIGHT ),
+ -10, 10
+ );
+