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POHow to use GLUT not in main thread on OS X?
 

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  1. POHow to use GLUT not in main thread on OS X?
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    <p>I once tried to open a GLUT window from a sub-thread and got lots of nasty problems. I remember this post on lists.apple.com:</p> <pre><code>GLUT functions may only be called from the application's main thread </code></pre> <p>Has anything changed in this regard with GLUT on Mac OS X ? Is there a thread-safe GLUT that let's you open windows from any thread ?</p> <p>If GLUT is not an option, is there a tiny library that replaces GLUT and would work from any thread ?</p> <p><strong>[edit]</strong></p> <p>Here is the result of my tests triggered by the various solutions proposed as answers:</p> <ul> <li>GLFW looked nice but did not compile (current branch is 3 years old)</li> <li>Agar was another pretender but it's too big for the tiny need I had</li> <li>SDL is not BSD-license compatible and it's a huge library for code that should fit on a single file</li> <li>GLUT cannot run in any thread.</li> </ul> <p>I decided to reinvent the wheel (yes, that's good sometimes) and the final class is just 200 lines of code. It let's me open and close a window from any thread (openGL draw in new thread) and I have full control on vertical sync and such (SDL uses double buffering = slow for openGL). I had to trick around the <code>NSApp</code> to properly start and stop the application (which does not use an event loop otherwise).</p> <p>To those telling me that OpenGL is not thread-safe, that's not exactly true: you can run multiple OpenGL threads and the draw commands will be executed in the OpenGL state assigned to that thread. OpenGL is <strong>thread-specific</strong>.</p> <p>If anyone needs some bare-bones code to create OpenGL windows using Cocoa: <a href="http://github.com/rubyk/rubyk/blob/master/src/lib_objects/gl_window/macosx/gl_window.mm" rel="nofollow noreferrer">gl_window.mm</a></p>
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