【狼】openGL 光照的学习

#include "stdafx.h"
#include <windows.h>

#include "iostream"

#include "GL/glut.h"
#include "math.h"

#define windowsWidth  500
#define windowsHeight 500


using namespace std;

int preX,preY;        
bool leftState=false;
bool rightState=false;
float angleX=0.0;
float angleY=0.0;
float angleY1=0.0;
float angleY2=0.0;
float angleX1=0.0;
float angleX2=0.0;



void init()
{
    GLfloat mat_diffuse[4] = {0.5,0.5,0.5,1};
    GLfloat mat_specular[] = {1,1,1,1};
    GLfloat mat_ambient[] = {1,1,1,1};
    GLfloat light_position[] = {1,1,1,0};

    glClearColor(0,0,0,0);
    glShadeModel(GL_SMOOTH);
    glEnable(GL_DEPTH_TEST);
    glMaterialfv(GL_FRONT,GL_AMBIENT,mat_ambient);//环境光（全局环境光）
    glMaterialfv(GL_FRONT,GL_DIFFUSE,mat_diffuse);//散射光（很微弱的光，感觉像是从各种的物体反射的光）
    glMaterialfv(GL_FRONT,GL_SPECULAR,mat_specular);//反射光（像高光）
    glMaterialf(GL_FRONT,GL_SHININESS,25.0);
    glLightfv(GL_LIGHT0,GL_POSITION,light_position);
    glEnable(GL_LIGHTING);
    glEnable(GL_LIGHT0);
    glColorMaterial(GL_FRONT,GL_DIFFUSE);
    glEnable(GL_COLOR_MATERIAL);
    glClear(GL_COLOR_BUFFER_BIT);
    glRotatef(angleX1,0.0,1.0,0.0);
    glRotatef(angleY1,-1.0,0.0,0.0);
    glBegin(GL_DIFFUSE);
    glColor3f(0.0f,0.0f,1.0f);    
    glutSolidTeapot(0.6f); 
    cout<<"init"<<endl;
}
void KeyPressFunc(int key, int x, int y)
{


    if(key==GLUT_KEY_UP)
    {
        angleY1 = 1;
        angleX1 = 0;
        glutPostRedisplay();//重绘图像

    }
    else if(key==GLUT_KEY_DOWN)
    {
        angleY1 = -1;
            angleX1 = 0;
        glutPostRedisplay();
    }
    else if(key==GLUT_KEY_RIGHT)
    {
        angleX1 = 1;
        angleY1 = 0;
        glutPostRedisplay();
    }
    else if(key==GLUT_KEY_LEFT)
    {
        angleX1 =- 1;
            angleY1 = 0;
        glutPostRedisplay();
    }
}
void randerScene()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    init(); 
    glFlush();
    //ERROR
    cout<<"shuaxin"<<endl;
}
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)w/(GLfloat)h,1.5*(GLfloat)w/(GLfloat)h,-10,10);

    } 
    else
    {
        glOrtho(-1.5*(GLfloat)w/(GLfloat)h,1.5*(GLfloat)w/(GLfloat)h,-1.5,1.5,-10,10);

    }
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    randerScene();
}

void IdleFunc()
{
    angleY1 = 0;
    angleX1 = 0.1;
    glutPostRedisplay();//重绘图像
}
void setupRc()
{
    glClearColor(0.5f,0.5f,0.5f,1.0f);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT );

    glShadeModel (GL_FLAT);//光滑着色
}


int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH | GLUT_STENCIL );

    glutInitWindowPosition(100, 100);

    glutInitWindowSize(400, 400);

    glutCreateWindow("teapot");
    init();
    glutDisplayFunc(randerScene);
    setupRc();
    glutSpecialFunc(KeyPressFunc);
//  glutIdleFunc(IdleFunc);//空闲状态执行函数(取消注释茶壶自行旋转)
    glutReshapeFunc(&reshape);
    glutMainLoop();

    return 0;

}