opengl学习记录1——矩形绘制

 #include <windows.h>
 #include <gl/GL.h>
 #include <gl/GLU.h>
 #include <glut.h>

 #pragma comment( lib, "glut.lib" )

 void display()
 {
     glClear( GL_COLOR_BUFFER_BIT );

     glColor3f( 1.0, 1.0, 1.0 );
     glBegin( GL_POLYGON );
         glVertex3f( 0.25, 0.25, 0.0 );
         glVertex3f( 0.75, 0.25, 0.0 );
         glVertex3f( 0.75, 0.75, 0.0 );
         glVertex3f( 0.25, 0.75, 0.0 );
     glEnd();

     glFlush();
 }

 void init()
 {
     glMatrixMode( GL_PROJECTION );
     glLoadIdentity();
     glOrtho( 0.0, 1.0, 0.0,  1.0, -1.0, 1.0 );
 }

 int gl001_main( int argc, char **argv )
 {
     glutInit( &argc, argv );
     //glutInitDisplayMode( GLUT_SINGLE | GLUT_RGB );
     //glutInitWindowSize( 250, 250 );
     //glutInitWindowPosition( 100, 100 );
     glutCreateWindow( "Hello " );
     init();
     glutDisplayFunc( display );
     glutMainLoop();
     return ;
 }

运行结果：