地球轉動
#include<GL/glut.h>
#include<opencv/highgui.h>
#include<opencv/cv.h>

GLUquadric*quad=NULL;
float angle=0;
void display()
{
   glEnable(GL_DEPTH_TEST);
   glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
 
   glPushMatrix();
   
     glRotatef(angle,0,1,0);
   
   
 
   gluQuadricTexture(quad,true);
   gluSphere(quad,0.5,30,30);
 

   glPopMatrix();

   glutSwapBuffers();
}

void idle()
{
 angle++;
 glutPostRedisplay();
}

int main()
{
    glutInitDisplayMode(GL_DOUBLE|GLUT_DEPTH);
    glutCreateWindow("week08");
    glutDisplayFunc(display);
    glutIdleFunc(idle);
   
    GLuint id;
 IplImage * img = cvLoadImage("earth.jpg");
 cvCvtColor(img, img, CV_BGR2RGB);
 glEnable(GL_TEXTURE_2D);
 glGenTextures(1,&id);
 glBindTexture(GL_TEXTURE_2D,id);

 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_LINEAR);
 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_LINEAR);
 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img->width, img->height, 0, GL_RGB, GL_UNSIGNED_BYTE, img->imageData);
   
    quad=gluNewQuadric();
   
    glutMainLoop();
}