1
我一直呼叫glutMainLoopEvent
來處理圖形。但是,在某人關閉窗口後,我想退出該循環並顯示Code reached here.
。看起來當一個窗口關閉時,一個exit
函數被調用並且整個應用程序停止。雖然我需要應用程序繼續。我應該如何修復代碼?即使在openGL窗口關閉後繼續執行程序
#include <stdio.h>
#include <GL/freeglut.h>
//display function - draws a triangle rotating about the origin
void cback_render()
{
//keeps track of rotations
static float rotations = 0;
//OpenGL stuff for triangle
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glRotatef(rotations, 0, 0, 1);
glBegin(GL_TRIANGLES);
glVertex3f(0,0,0);
glVertex3f(1,0,0);
glVertex3f(0,1,0);
glEnd();
//display on screen
glutSwapBuffers();
//rotate triangle a little bit, wrapping around at 360°
if (++rotations > 360) rotations -= 360;
}
void timer(int value)
{
glutPostRedisplay();
glutMainLoopEvent();
glutTimerFunc(30, timer, 1);
}
int main(int argc, char **argv)
{
//initialisations
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutInitWindowPosition(100, 100);
glutInitWindowSize(512, 512);
//create window and register display callback
glutCreateWindow("freegluttest");
glutDisplayFunc (cback_render);
glutTimerFunc(30, timer, 1);
//loop forever
long i=0;
while(1)
{
printf("[%ld]\n",i);
i++;
glutMainLoopEvent();
}
printf("Code reached here.");
return 0;
}
如何檢測窗口被關閉,停止'while'循環? – ar2015
也許你可以使用glutGetWindow()來查看窗口是否存在。如果該窗口不存在,它將返回0。 – Schomes
請看:https://www.opengl.org/resources/libraries/glut/spec3/node18.html – Schomes