OpenGL【C++】图形学实验七 不同的光照渲染

漫反射、镜面反射、环境光

# include < GL/glut.h > 
GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 };
GLfloat light_position1[] = { 0.0, 0.0, 1.0, 0.0 };
GLfloat mat_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
GLfloat mat_close[] = { 0.0,0.0,0.0,1.0 };
GLfloat mat_shininess[] = { 80.0 };
/* 初始化材料属性、光源属性、光照模型，打开深度缓冲区等 */
void init(void)
{
	glClearColor(0.5, 0.0, 1.0, 0.0); //设置背景色为蓝色
	glShadeModel(GL_SMOOTH);
	//glMaterialfv(GL_FRONT,GL_AMBIENT,mat_specular);

	glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);//反射指数


	glLightfv(GL_LIGHT0, GL_POSITION, light_position);

	glEnable(GL_LIGHTING);
	glEnable(GL_LIGHT0);
	glEnable(GL_DEPTH_TEST);
}
/*调用 GLUT 函数,绘制一个球*/
void display(void)
{
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glutSolidSphere(1.0, 240, 250);    //半径为 1,40 条纬线,50 条经线
	glFlush();
}
/* 定义 GLUT 的 reshape 函数，w、h 分别是输出图形的窗口的宽和高*/
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); //创建平行视景体
	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();
}
void re(void)
{
	glMaterialfv(GL_FRONT, GL_SPECULAR, mat_close);
	glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_close);
	glMaterialfv(GL_FRONT, GL_AMBIENT, mat_close);
}
void keyboard(unsigned char key, int x, int y)
{
	if (key == '1') { re(); glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); glutPostRedisplay(); }//漫反射
	if (key == '2') { re(); glMaterialfv(GL_FRONT, GL_SPECULAR, mat_diffuse); glutPostRedisplay(); }//镜面反射
	if (key == '3') { re(); glMaterialfv(GL_FRONT, GL_AMBIENT, mat_diffuse); glutPostRedisplay(); }//环境光
	if (key == '4') { re(); glMaterialfv(GL_FRONT, GL_AMBIENT, mat_diffuse); glMaterialfv(GL_FRONT, GL_SPECULAR, mat_diffuse); glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); glutPostRedisplay(); }//环境光
	if (key == '5') { re(); }//三种光
	if (key == '6') { glLightfv(GL_LIGHT1, GL_POSITION, light_position1); glEnable(GL_LIGHT1); };
}
int main(int argc, char** argv)
{
	glutInit(&argc, argv);     // GLUT 环境初始化
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH); // 显示模式初始化
	glutInitWindowSize(600, 600);       // 定义窗口大小
	glutInitWindowPosition(100, 100);   // 定义窗口位置  
	glutCreateWindow(argv[0]);   // 显示窗口,窗口标题为执行函数名
	init();
	glutDisplayFunc(display); 	// 注册 OpenGL 绘图函数(一种特殊的调用方式,下同) 
	glutReshapeFunc(reshape);   // 注册窗口大小改变时的响应函数
	glutKeyboardFunc(keyboard);

	glutMainLoop();      // 进入 GLUT 消息循环，开始执行程序
	return 0;
}