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 0;
}

运行结果：