图解VC++ opengl环境配置和几个入门样例

VC6下载

http://blog.csdn.net/bcbobo21cn/article/details/44200205

demoproject和glut库下载

http://pan.baidu.com/s/1pLSpKiZ

一 环境配置

參阅

http://blog.itpub.net/17267437/viewspace-545635/

解压glut库

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拷贝glut.h到例如以下文件夹；

拷贝图1的两个lib到例如以下文件夹。

拷贝图1的两个dll到例如以下文件夹（偶是64位系统）。

project设置加入四个lib

二样例1

#include <GL/glut.h>

#include <math.h>



const int n = 200;

const GLfloat R = 0.5f;

const GLfloat Pi = 3.1415926536f;



void myDisplay(void)

{

int i;

// 画一个绿色正方形

    glClear(GL_COLOR_BUFFER_BIT);

    glColor3f(0.0f,1.0f,0.0f);

    glRectf(-0.5f, 0.4f, 0.0f, 0.9f); //画一个绿色的正方形

    //glFlush();



//glClearColor(0.0,0.0,0.0,0.0);

     //glClear(GL_COLOR_BUFFER_BIT);

     glColor4f(1.0,0.0,0.0,1.0);     // set the quad color

     glBegin(GL_QUADS);

         glVertex3f(-0.2,-0.2,0.0);

         glVertex3f(0.2,-0.2,0.0);

         glVertex3f(0.2,0.2,0.0);

         glVertex3f(-0.2,0.2,0.0);

    glEnd();



glColor4f(1.0,0.0,0.0,1.0);   // set the point color

      glPointSize(10);

      glBegin(GL_POINTS);

          glVertex3f(-0.5,-0.5,0.0);

          glVertex3f(0.5,-0.5,0.0);

          glVertex3f(0.5,0.5,0.0);

          glVertex3f(-0.5,0.5,0.0);

     glEnd();



glColor4f(1.0,0.0,0.0,1.0); // set the line color

      glLineWidth(5);

      glBegin(GL_LINES);

            glVertex3f(-0.5,-0.5,0.0);

            glVertex3f(0.5,-0.5,0.0);

            glVertex3f(0.5,0.5,0.0);

            glVertex3f(-0.5,0.5,0.0);

      glEnd();



 /*glBegin(GL_POLYGON);

for(i=0; i<n; ++i)

glVertex2f(R*cos(2*Pi/n*i), R*sin(2*Pi/n*i));

glEnd();*/



    glFlush();

}



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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);

    glutInitWindowPosition(100, 0);

    glutInitWindowSize(1024, 768);

    glutCreateWindow("OpenGL基本绘制");

    glutDisplayFunc(&myDisplay);

    glutMainLoop();

    return 0;

}

网上说要改下图的_CONSOLE，我没改也能在开发环境下执行。

三 样例2

#include <GL/glut.h>



void myDisplay(void)

{

glClear(GL_COLOR_BUFFER_BIT);

glRectf(-0.5f, -0.5f, 0.5f, 0.5f);

glFlush();

}



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

{

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);

glutInitWindowPosition(100, 100);

glutInitWindowSize(400, 400);

glutCreateWindow("第一个OpenGL程序");

glutDisplayFunc(&myDisplay);

glutMainLoop();

return 0;

}

四 样例3

#include <GL/glut.h>



//Called to draw scene

void RenderSence(void)

{

//Clear the window with current clearing color

glClear(GL_COLOR_BUFFER_BIT);

//Flush drawing commands

glFlush();

}

//Set up the rendering state

void SetupRC(void)

{

glClearColor(0.0f,0.0f,1.0f,1.0f);      //此时背景色为蓝色

}



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

{



//glutInit(&argc, argv);

glutInitDisplayMode(GLUT_SINGLE|GLUT_SINGLE|GLUT_RGB);

glutCreateWindow("Simple");        //窗体名为“Simple”

glutDisplayFunc(RenderSence);

SetupRC();

glutMainLoop();



return 0;

}

编译，出现一堆下述错误；

demo4.cpp

y:\dddd10\vc6opengldemo\demo4\demo4.cpp(5) : error C2018: unknown character '0xa1'

y:\dddd10\vc6opengldemo\demo4\demo4.cpp(5) : error C2018: unknown character '0xa1'

y:\dddd10\vc6opengldemo\demo4\demo4.cpp(10) : error C2018: unknown character '0xa1'

......

是由于代码中包括全角字符；寻找发现该全角字符是空格；用替换功能，把全角空格所有替换为半角空格再编译就可以；

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五 样例4

#include <GL/glut.h> 



void background(void)

{

glClearColor(0.0,0.0,0.0,0.0);//设置背景颜色为黑色

}



void myDisplay(void)

{

glClear(GL_COLOR_BUFFER_BIT);//buffer设置为颜色可写



 glBegin(GL_TRIANGLES);//開始画三角形

 glShadeModel(GL_SMOOTH);//设置为光滑明暗模式



 glColor3f(1.0,0.0,0.0);//设置第一个顶点为红色

 glVertex2f(-1.0,-1.0);//设置第一个顶点的坐标为（-1.0，-1.0）



 glColor3f(0.0,1.0,0.0);//设置第二个顶点为绿色

 glVertex2f(0.0,-1.0);//设置第二个顶点的坐标为（0.0，-1.0）



 glColor3f(0.0,0.0,1.0);//设置第三个顶点为蓝色

 glVertex2f(-0.5,1.0);//设置第三个顶点的坐标为（-0.5。1.0）

 glEnd();//三角形结束



 glFlush();//强制OpenGL函数在有限时间内执行

}



void myReshape(GLsizei w,GLsizei h)

{

 glViewport(0,0,w,h);//设置视口



 glMatrixMode(GL_PROJECTION);//指明当前矩阵为GL_PROJECTION

 glLoadIdentity();//将当前矩阵置换为单位阵



 if(w <= h)

  gluOrtho2D(-1.0,1.5,-1.5,1.5*(GLfloat)h/(GLfloat)w);//定义二维正视投影矩阵

 else

  gluOrtho2D(-1.0,1.5*(GLfloat)w/(GLfloat)h,-1.5,1.5);

  glMatrixMode(GL_MODELVIEW);//指明当前矩阵为GL_MODELVIEW

}



int main(int argc,char ** argv)

{

 /*初始化*/

 glutInit(&argc,argv);

 glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);

 glutInitWindowSize(400,400);

 glutInitWindowPosition(200,200);



 /*创建窗体*/

 glutCreateWindow("Triangle");



 /*绘制与显示*/

 background();

 glutReshapeFunc(myReshape);

 glutDisplayFunc(myDisplay);



 glutMainLoop();

 return(0);

}

六 opengl资源链接

http://www.cnblogs.com/phinecos/category/90224.html

基于MFC的opengl编程