3D 应用程序中的 OpenGL 2D hud [英] OpenGL 2D hud in 3D application

问题描述

我一直在尝试在我的 OpenGL 应用程序中创建一个平视显示器.环顾四周，似乎使用正射投影的方法是这样做的，但到目前为止，我还无法使程序正确呈现.发生的事情不是在我的显示器顶部渲染，而是出现奇怪的图形故障，如下所示:

I have been trying to create a hud in my OpenGL application. Having looked around, it seems the way to do it is with an ortho projection, but so far I have not been able to get the program to render correctly. What is happening is instead of rendering on top of my display, I'm getting odd graphical glitches as seen here:

如果我注释掉 hud 代码，一切都会完美呈现.

If I comment out the hud code, everything renders perfectly.

glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);

//Set up projection matrix
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
//Using gluPerspective. It's pretty easy and looks nice.
gluPerspective(fov, aspect, zNear, zFar);

//Set up modelview matrix
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

//3D rendering

glDepthMask(GL_FALSE);
glDisable(GL_DEPTH_TEST);

glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0,window_width,0,window_height); //left,right,bottom,top

glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glColor3f(0.0,0.0,1.0);
glBegin(GL_QUADS);
    glVertex2f(50,50);
    glVertex2f(50,100);
    glVertex2f(100,100);
    glVertex2f(100,50);
glEnd();

推荐答案

渲染完 HUD 后，您需要重新启用深度写入

Once you're done rendering the HUD, you need to re-enable the depth writes

glDepthMask(GL_TRUE);

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