1 #include <windows.h> 2 #include <gl/GL.h> 3 #include <gl/GLU.h> 4 #include <glut.h> 5  6 #pragma comment( lib, "glut.lib" ) 7  8 void display() 9 {10     glClear( GL_COLOR_BUFFER_BIT );11 12     glColor3f( 1.0, 1.0, 1.0 );13     glBegin( GL_POLYGON );14         glVertex3f( 0.25, 0.25, 0.0 );15         glVertex3f( 0.75, 0.25, 0.0 );16         glVertex3f( 0.75, 0.75, 0.0 );17         glVertex3f( 0.25, 0.75, 0.0 );18     glEnd();19 20     glFlush();21 }22 23 void init()24 {25     glMatrixMode( GL_PROJECTION );26     glLoadIdentity();27     glOrtho( 0.0, 1.0, 0.0,  1.0, -1.0, 1.0 );28 }29 30 int gl001_main( int argc, char **argv )31 {32     glutInit( &argc, argv );33     //glutInitDisplayMode( GLUT_SINGLE | GLUT_RGB );34     //glutInitWindowSize( 250, 250 );35     //glutInitWindowPosition( 100, 100 );36     glutCreateWindow( "Hello " );37     init();38     glutDisplayFunc( display );39     glutMainLoop();40     return 0;41 }