图解VC++ opengl环境配置和几个入门样例

Posted 2020-10-03

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

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；

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