OpenGL只显示窗口 不显示图像
代码如下：
#define GLUT_DISABLE_ATEXIT_HACK
#include<GL/glut.h>
void myDisplay(void) {
glClearColor(0.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT); glColor3f(1.0f, 1.0f, 1.0f);
glRectf(-0.5f, -0.5f, 0.5f, 0.5f); glBegin(GL_TRIANGLES);
glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(0.0f, 1.0f);
glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(0.8f, -0.5f);
glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(-0.8f, -0.5f);
glEnd();

glPointSize(3);
glBegin(GL_POINTS);
glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(-0.4f, -0.4f);
glColor3f(0.0f, 0.0f, 0.0f); glVertex2f(0.0f, 0.0f);
glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(0.4f, 0.4f);
glEnd();

}
int main(int argc, char* argv[])
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);
glutInitWindowPosition(100, 100);
glutInitWindowSize(400, 400);
glutCreateWindow("Hello World!");
glutDisplayFunc(&myDisplay);
glutMainLoop();
return 0;
}