第一弹 创建窗体，并绘制一个三角形一个矩形

/*************************************************************************    > File Name: frame.cpp    > Author:Aerk    > Mail: [e-mail] ************************************************************************/#include<iostream>#include<GL/glut.h>using namespace std;void init(void){    glClearColor(0.0,0.0,0.0,0.0);    glMatrixMode(GL_PROJECTION);    glOrtho(-10,10,-10,10,-15,15); //   glMatrixMode(GL_MODELVIEW);    gluLookAt(0,0,10,0,0,0,0,3,0);    return;}void display(void){    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);    glColor3f(1,0,0);    glTranslatef(-2.0f,0.0f,-0.0f); //    glLoadIdentity();    glBegin(GL_TRIANGLES);    glVertex3f(0.0f,1.0f,0.0f);    glVertex3f(-1.0,-1.0,0.0f);    glVertex3f(1.0,-1.0,0.0f);    glEnd();    glTranslatef(2.0f,0.0f,0.0f);    glBegin(GL_QUADS);     glVertex3f(-1.0f,1.0f,0.0f);    glVertex3f(1.0f,1.0f,0.0f);    glVertex3f(1.0f,-1.0f,0.0f);    glVertex3f(-1.0f,-1.0f,0.0f);    glEnd();   // glutWireTeapot(3);    glFlush();    return;}int main(int argc,char **argv){    glutInit(&argc,argv);    glutInitDisplayMode(GLUT_RGB|GLUT_SINGLE);    glutInitWindowPosition(0,0);    glutInitWindowSize(500,500);    glutCreateWindow("OpenGL 3D View");    init();    glutDisplayFunc(display);    glutMainLoop();    return 0;}