// 范例P124.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <gl/glut.h>

void display()
{
 glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);     //清除所有像素
 glutSolidSphere(1.0,20,6);
 /*在缓存中绘制4对顶点坐标的矩形*/
 
 glFlush();          //立即显示出来
}

void init()
{
 glClearColor(0.0,0.0,0.0,0.0);     //用黑色清除背景
 
 GLfloat mat_specular[]={1.0, 1.0, 1.0, 1.0};
 GLfloat mat_shininess[]={50.0};
 GLfloat light_position[]={1.0,1.0,1.0,0.0};
 GLfloat white_light[]={1.0,1.0,1.0,1.0};
 GLfloat lmodel_ambient[]={0.1,0.1,0.1,1.0
 };

 glShadeModel(GL_SMOOTH);
 glMaterialfv(GL_FRONT,GL_SPECULAR,mat_specular);
 glMaterialfv(GL_FRONT,GL_SHININESS,mat_shininess);
 glLightfv(GL_LIGHT0,GL_POSITION,light_position);
 glLightfv(GL_LIGHT0,GL_DIFFUSE,white_light);
 glLightfv(GL_LIGHT0,GL_SPECULAR,white_light);
 glLightModelfv(GL_LIGHT_MODEL_AMBIENT,lmodel_ambient);

 glEnable(GL_LIGHTING);
 glEnable(GL_LIGHT0);
 glEnable(GL_DEPTH_TEST);
}
void reshape(int w,int h)
{
 glViewport(0,0,(GLsizei)w,(GLsizei)h);
 glMatrixMode(GL_PROJECTION);
 glLoadIdentity();
 if(w<=h)
  glOrtho(-1.5,1.5,-1.5*(GLfloat)h/(GLfloat)w,1.5*(GLfloat)h/(GLfloat)w,-10.0,10.0);
 else
  glOrtho(-1.5*(GLfloat)w/(GLfloat)h,1.5*(GLfloat)w/(GLfloat)h,-1.5,1.5,-10.0,10.0);
 glMatrixMode(GL_MODELVIEW);
 glLoadIdentity();

}
int main(int argc,char ** argv)
{
 glutInit(&argc,argv);
 glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
 glutInitWindowSize(250,250);     //初始化窗口大小
 glutInitWindowPosition(0,0);    //初始化窗口位置
 glutCreateWindow("hello");      //创建标题为“hello”的窗口
 init();           //调用初始化函数
 glutDisplayFunc(display);      //注册回调函数
 glutReshapeFunc(reshape);
 glutMainLoop();         //进入主循环处理事件
 return 0;
}

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