void render() {
glClear(GL_COLOR_BUFFER_BIT);
glBegin(GL_TRIANGLES);
glVertex3f(-0.5f, -0.5f, 0.0f);
glVertex3f(0.5f, 0.5f, 0.0f);
glVertex3f(0.0f, 0.5f, 0.0f);
glEnd();
glFlush();
}
int main(int argc, char *argv[]) {
glutInit(&argc, argv);
glutInitWindowSize(480, 320);
glutInitWindowPosition(200, 100);
glutCreateWindow("OpenGL Demo");
glutDisplayFunc(render);
glutMainLoop();
return 0;
}