为什么glOrtho()在Mac上可以运行，而gluOrtho2D()不能在Mac上运行? [英] Why glOrtho() works under Mac but gluOrtho2D() doesn't?

问题描述

几天前，我发布了这个问题(我不知道打开一个新线程是否合适……但是，当我从这篇文章中得到答案时，我将关闭该线程):QGLWidget在Mac OS X Lion上无法正常工作.

Several days ago I posted this question(I don't know if it's proper to open a new thread... however when I get the answer from this post I will close that one): QGLWidget not working correctly under Mac OS X Lion .

我在线上获取了一些示例代码，将它们与我的代码进行了比较，并确认问题出在以下方面:

I grabbed some example code online, compared them with mine, and confirmed the problem is raised by:

gluOrtho2D(0, w, 0, h);

并将其更改为:

glOrtho(0, w, 0, h, -1, 1);

并删除了glu作为依赖项，我的程序正常工作.为什么?有什么区别?

and removed glu as dependency, my program worked. why? what's the difference?

推荐答案

好的，我想我已经找到答案了.

OK I think I get the answer.

问题是我链接了两个版本的OpenGL.苹果有自己的GL实施AGL，Qt将链接到该实施；但是我不知道，所以我也将安装在/opt/local下的glu链接到该程序.我猜测，Mac Ports引入了该版本以编译X11程序.

The problem is I was linking two versions of OpenGL; Apple has its own GL implementation, AGL, which Qt will link to; but I didn't know that so I linked glu installed under /opt/local to the program as well. I guess that version is introduced by Mac Ports to compile X11 programs.

无论如何，因为我删除了GLU的依赖关系，所以唯一的链接实现是AGL；因此它按预期工作.

Anyway, because I removed dependency of GLU, the only linked implementation is AGL; so it worked as expected.

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