#include <windows.h>//#include <GLUT/glut.h>#include <GL/glut.h>#include <math.h>#include <iostream>using namespace std;#define GL_PI 3.1415fvoid RenderScene(){    static GLfloat xRot = 0,yRot = 0;    GLfloat x,y,angle;    int iPivot = 1;    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);    GLboolean bCull = true;    GLboolean bDepth = true;    GLboolean bOutline = true;    if(bCull)　　　　　　　　　　　　　　//启动剔除标志　　        glEnable(GL_CULL_FACE);    else        glDisable(GL_CULL_FACE);    if(bDepth)　　　　　　　　　　　　  //启用深度测试标志        glEnable(GL_DEPTH_TEST);    else        glDisable(GL_DEPTH_TEST);    if(bOutline)　　　　　　　　　　　　//启用多边形模式标志        glPolygonMode(GL_BACK,GL_LINE);    else        glPolygonMode(GL_BACK,GL_FILL);    glPushMatrix();    glRotatef(45.0f,1.0f,0.0f,0.0f);    glRotatef(45.0f,0.0f,1.0f,0.0f);    glRotatef(xRot,1.0f,0.0f,0.0f);    glRotatef(yRot,0.0f,1.0f,0.0f);    glFrontFace(GL_CW);    glBegin(GL_TRIANGLE_FAN);        glVertex3f(0.0f,0.0f,75.0f);        for(angle = 0.0f;angle < (2.0*GL_PI);angle += (GL_PI)/8.0)        {            x = 50.0f*sin(angle);            y = 50.0f*cos(angle);            if((iPivot %2)==0)                glColor3f(0.0f,0.0f,1.0f);            else                glColor3f(1.0f,0.0f,0.0f);            iPivot++;            glVertex2f(x,y);        }    glEnd();    //glFrontFace(GL_CCW|GL_CW);    glBegin(GL_TRIANGLE_FAN);    glVertex2f(0.0f,0.0f);    for(angle = 0.0f;angle < (2.0f*GL_PI);angle += (GL_PI)/8.0f)    {        x = 50.0f*sin(angle);        y = 50.0f*cos(angle);        if((iPivot %2)==0)            glColor3f(0.0f,0.0f,1.0f);        else            glColor3f(1.0f,0.0f,0.0f);        iPivot++;        glVertex2f(x,y);    }    glEnd();    if(xRot < 360)        xRot += 5.0f;    else        xRot = 0.0f;    if(yRot < 360)        yRot += 5.0f;    else        yRot = 0;    glPopMatrix();    glutSwapBuffers();}void TimerFunction(int value){    glutPostRedisplay();    glutTimerFunc(33,TimerFunction,1);}void ChangeSize(GLsizei w,GLsizei h){    if(h==0)        h = 1;    GLfloat aspectRatio = (GLfloat)w/(GLfloat)h;    glViewport(0,0,w,h);    glMatrixMode(GL_PROJECTION);    glLoadIdentity();    if(w<=h)        glOrtho(-100,100,-100/aspectRatio,100/aspectRatio,100.0,-100.0);    else        glOrtho(-100*aspectRatio,100*aspectRatio,-100,100,100.0,-100.0);    glMatrixMode(GL_MODELVIEW);    glLoadIdentity();}void SetupRC(){    glClearColor(0.0f,0.0f,0.0f,1.0f);    glColor3f(1.0f,0.0f,0.0f);    glShadeModel(GL_FLAT);    glFrontFace(GL_CW);}int main(int argc, char *argv[]){   glutInit(&argc,argv);   glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB|GLUT_DEPTH);   glutInitWindowSize(800,600);   glutCreateWindow("Simple");   glutDisplayFunc(RenderScene);   glutReshapeFunc(ChangeSize);   glutTimerFunc(33,TimerFunction,1);   SetupRC();   glutMainLoop();   return 0;}