深度测试（消隐）demo

来源：互联网发布：知学学院简介编辑：程序博客网时间：2024/06/05 17:59

#include <math.h>
#include <gl/glut.h>
#include <gl/gl.h>
bool mouseisdown=false;
bool loopr=false;
int mx,my;int ry=30;
int rx=30;
void timer(int p)
{
ry-=5;
glutPostRedisplay();
if (loopr)
  glutTimerFunc(200,timer,0);
}
void mouse(int button, int state, int x, int y)
{
if(button == GLUT_LEFT_BUTTON)
{
  if(state == GLUT_DOWN)
  {
   mouseisdown=true; loopr=false;
  }
  else
   mouseisdown=false;
}
if (button== GLUT_RIGHT_BUTTON)
  if(state == GLUT_DOWN)
  {loopr=true; glutTimerFunc(200,timer,0);}
}

void motion(int x, int y)
{
if(mouseisdown==true)
{
  ry+=x-mx;
  rx+=y-my;
  mx=x;
  my=y;
  glutPostRedisplay();
}
}

void special(int key, int x, int y)
{
switch(key)
{
case GLUT_KEY_LEFT:
  ry-=5;
  glutPostRedisplay();
  break;
case GLUT_KEY_RIGHT:
  ry+=5;
  glutPostRedisplay();
  break;
case GLUT_KEY_UP:
  rx+=5;
  glutPostRedisplay();
  break;
case GLUT_KEY_DOWN:
  rx-=5;
  glutPostRedisplay();
  break;
}
}

void init()
//设置OpenGL的一些状态变量的初始值
{
glEnable(GL_DEPTH_TEST); //深度测试

glDepthFunc(GL_LESS); //设置深度测试函数

glPolygonMode(GL_FRONT_AND_BACK,GL_FILL); //设置多边形显示模式为正反面都是填充显示

glClearColor(1,1,1,1); //设置刷新背景色

glClearDepth(1); //设置清除深度缓冲区所用的值
}

void display() {
float red[3]={1,0,0};
float blue[3]={0,1,0};
float green[3]={0,0,1};
float yellow[3]={1,1,0};
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glRotatef(ry,0,1,0);
glRotatef(rx,1,0,0);
glBegin(GL_QUADS);
glColor3fv(green);
glVertex3f(0.5,0.5,0);
glVertex3f(-0.5,0.5,0);
glVertex3f(-0.5,-0.5,0);
glVertex3f(0.5,-0.5,0);
glEnd();
glBegin(GL_QUADS);
glColor3fv(red);
glVertex3f(0.5,0.5,0.3);
glVertex3f(-0.5,0.5,-0.3);
glVertex3f(-0.5,-0.5,-0.3);
glVertex3f(0.5,-0.5,0.3);
glEnd();
glBegin(GL_QUADS);
glColor3fv(yellow);
glVertex3f(0.5,0.5,-0.3);
glVertex3f(-0.5,0.5,0.3);
glVertex3f(-0.5,-0.5,0.3);
glVertex3f(0.5,-0.5,-0.3);
glEnd();
glFlush();
glutSwapBuffers();
}

int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode (GLUT_DOUBLE| GLUT_RGBA|GLUT_DEPTH); //设置显示模式：单缓冲区， RGBA颜色模式
glutInitWindowSize (400, 400);        //设置窗口宽度、高度
glutInitWindowPosition(100,100);       //设置窗口位置
glutCreateWindow ("double");        //弹出窗口
init();    glutDisplayFunc (display);        //设置窗口刷新的回调函数
glutMouseFunc(mouse);         //设置鼠标器按键回调函数
glutMotionFunc(motion);
glutSpecialFunc(special);
glutMainLoop();        //开始主循环
return 0;
}

0 0