日期:2014-05-16 浏览次数:20794 次
#include <GL/glut.h>
#define window_width 640
#define window_height 480
// Main loop
void main_loop_function()
{
// Z angle
    static float angle;
// Clear color (screen)
// And depth (used internally to block obstructed objects)
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Load identity matrix
    glLoadIdentity();
// Multiply in translation matrix
    glTranslatef(0, 0, -10);
// Multiply in rotation matrix
    glRotatef(angle, 0, 0, 1);
// Render colored quad
    glBegin(GL_QUADS);
    glColor3ub(255, 000, 000);
    glVertex2f(-1, 1);
    glColor3ub(000, 255, 000);
    glVertex2f(1, 1);
    glColor3ub(000, 000, 255);
    glVertex2f(1, -1);
    glColor3ub(255, 255, 000);
    glVertex2f(-1, -1);
    glEnd();
// Swap buffers (color buffers, makes previous render visible)
    glutSwapBuffers();
// Increase angle to rotate
    angle += 0.25;
}
// Initialze OpenGL perspective matrix
void GL_Setup(int width, int height)
{
    glViewport(0, 0, width, height);
    glMatrixMode(GL_PROJECTION);
    glEnable(GL_DEPTH_TEST);
    gluPerspective(45, (float) width / height, .1, 100);
    glMatrixMode(GL_MODELVIEW);
}
// Initialize GLUT and start main loop
int main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitWindowSize(window_width, window_height);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
    glutCreateWindow("GLUT Example!!!");
    glutIdleFunc(main_loop_function);
    GL_Setup(window_width, window_height);
    glutMainLoop();
    return 0;
}