opengl学习记录1——矩形绘制

 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 }