openGL拆分屏幕与图形旋转

#include<gl/glut.h> class wcPT2D { public: GLfloat x,y; }; void init() { glClearColor(1.0,1.0,1.0,0.0); glMatrixMode(GL_PROJECTION); gluOrtho2D(-100.0,100.0,-100.0,100.0); glMatrixMode(GL_MODELVIEW); } void triangle(wcPT2D *verts) { GLint k; glBegin(GL_TRIANGLES); for(k=0;k<3;k++) glVertex2f(verts[k].x,verts[k].y); glEnd(); } void displayfcn(void) { wcPT2D verts[3]={{-50.0,-25.0},{50.0,-25.0},{0.0,50.0}}; glClear(GL_COLOR_BUFFER_BIT); glColor3f(0.0,0.0,1.0); glViewport(0,0,300,300); triangle(verts); glColor3f(1.0,0.0,0.0); glViewport(300,0,300,300); glRotatef(90.0,0.0,0.0,1.0); triangle(verts); glFlush(); } void main(int argc,char** argv) { glutInit(&argc,argv); glutInitWindowSize(600,300); glutInitWindowPosition(50,50); glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB); glutCreateWindow("666"); init(); glutDisplayFunc(displayfcn); glutMainLoop(); }