OpenGL 编程指南

//opengl10.1.cpp:

//使用模板缓冲区

#include"stdafx.h"

#include<GL/glut.h>

#defineYELLOWMAT1

#defineBLUEMAT2

voidinit()

{

GLfloatyellow_diffuse[]={0.7,0.7,0.0,1.0};

GLfloatyellow_specular[]={1.0,1.0,1.0,1.0};

GLfloatblue_diffuse[]={0.1,0.1,0.7,1.0};

GLfloatblue_specular[]={0.1,1.0,1.0,1.0};

GLfloatposition_one[]={1.0,1.0,1.0,0.0};

glNewList(YELLOWMAT,GL_COMPILE);//显式列表

glMaterialfv(GL_FRONT,GL_DIFFUSE,yellow_diffuse);//材料属性,向量版本

glMaterialfv(GL_FRONT,GL_SPECULAR,yellow_specular);

glMaterialf(GL_FRONT,GL_SHININESS,64.0);//非向量版本的只用于设置GL_SHININESS

glEndList();

glNewList(BLUEMAT,GL_COMPILE);

glMaterialfv(GL_FRONT,GL_DIFFUSE,blue_diffuse);

glMaterialfv(GL_FRONT,GL_SPECULAR,blue_specular);

glMaterialf(GL_FRONT,GL_SHININESS,45.0);

glEndList();

glLightfv(GL_LIGHT0,GL_POSITION,position_one);//创建光源,浮点向量,指定坐标位置

glEnable(GL_LIGHT0);

glEnable(GL_LIGHTING);

glEnable(GL_DEPTH_TEST);

glClearStencil(0x0);//清除模板缓冲区

glEnable(GL_STENCIL_TEST);

}

/*画一个球在两环之间的钻石形中间的窗中.

*/

voiddisplay()

{

glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

glStencilFunc(GL_EQUAL,0x1,0x1);//模板测试函数

glStencilOp(GL_KEEP,GL_KEEP,GL_KEEP);//模板测试操作

glCallList(BLUEMAT);

glutSolidSphere(0.5,15,15);//半径,经线,纬线?

glStencilFunc(GL_NOTEQUAL,0x1,0x1);

glPushMatrix();

glRotatef(45.0,0.0,0.0,1.0);//模型变换,当前矩阵与一个移动坐标矩阵相乘,以逆时针从原点到(x,y,z)的直线旋转.这里相当于绕z旋转45度.

glRotatef(45.0,0.0,1.0,0.0);//再绕y转45

glCallList(YELLOWMAT);

glutSolidTorus(0.275,0.85,15,15);//内径,外径,密度边数,圆似度.

glPushMatrix();

glRotatef(90.0,1.0,0.0,0.0);

glutSolidTorus(0.275,0.85,15,15);

glPopMatrix();

glPopMatrix();

glFlush();//花了我半小时.

}

/*不管窗口是否重绘,重新确定坐标系统,重绘模板区

*/

voidreshape(intw,inth)//GLUT传递的绘区窗口宽高像素数.

{

glViewport(0,0,(GLsizei)w,(GLsizei)h);

//画个钻石形的模板区

glMatrixMode(GL_PROJECTION);

glLoadIdentity();

if(w<=h)//二维图像投影到二维屏幕,如果窗宽比高小,右上角需要按高宽比调整

gluOrtho2D(-3.0,3.0,-3.0*(GLfloat)h/(GLfloat)w,3.0*(GLfloat)h/(GLfloat)w);

else//如果宽比高大,需要把左下角按比例调整.

gluOrtho2D(-3.0*(GLfloat)w/(GLfloat)h,3.0*(GLfloat)w/(GLfloat)h,-3.0,3.0);

glMatrixMode(GL_MODELVIEW);

glLoadIdentity();

glClear(GL_STENCIL_BUFFER_BIT);//清除指定的缓冲区

glStencilFunc(GL_ALWAYS,0x1,0x1);//比较函数,参考值,掩码(比较只在掩码为1的位上进行)

glStencilOp(GL_REPLACE,GL_REPLACE,GL_REPLACE);

glBegin(GL_QUADS);//菱形

glVertex2f(-1.0,0.0);

glVertex2f(0.0,1.0);

glVertex2f(1.0,0.0);

glVertex2f(0.0,-1.0);

glEnd();

glMatrixMode(GL_PROJECTION);

glLoadIdentity();

gluPerspective(45.0,(GLfloat)w/(GLfloat)h,3.0,7.0);

glMatrixMode(GL_MODELVIEW);

glLoadIdentity();

glTranslatef(0.0,0.0,-5.0);

}

int_tmain(intargc,char**argv)

{

glutInit(&argc,argv);

glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB|GLUT_DEPTH|GLUT_STENCIL);

glutInitWindowSize(400,400);

glutInitWindowPosition(110,110);

glutCreateWindow("Ms.white");

init();

glutReshapeFunc(reshape);

glutDisplayFunc(display);

glutMainLoop();

return0;

}