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POQGLWidget Rendering The surrounding widgets
 

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    <p>This problem is exceedingly difficult to explain, I can't even think of a word to explain this phenomenon so I will just show you a picture.</p> <p><img src="https://i.stack.imgur.com/ghDtf.png" alt="enter image description here"></p> <p>On the far left is the actual dockwidget, and where its all overlapping is an openGL widget, which is supposed to be drawing blue and a tree. But it isn't.</p> <p>What is this problem even called and how do I fix it?</p> <p>I should also add that when there is no dockwidget involved it works perfectly.</p> <p>EDIT: New information, after profiling the app in an openGL profiler I have discovered that when the dock widget is used, CGLUpdateContext is never called for some reason, and every single gl call results in an error <code>GL_INVALID_FRAMEBUFFER_OPERATIO</code>N I also found the error <code>invalid drawable</code> appearing in the console.</p> <p>Further research shows this might be bug in Qt. I shall look into it more.</p> <p>EDIT2: I have put in this check before initializing openGL and calling glClear, which is where the first error is thrown. </p> <pre><code>GLenum er = glCheckFramebufferStatus(GL_FRAMEBUFFER); if(er != GL_FRAMEBUFFER_COMPLETE) { abort(); } </code></pre> <p>When a dock widget is used, this aborts at this point, telling us the frame buffer is incomplete. However, if I remove the dock widget, this does not abort and the app works fine. I now know that the frame buffer is incomplete, but why? This is a problem with Qt not my code.</p>
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    1. COOur app uses a game engine behind the scenes that has thousands of lines, I have not got any idea what code is the problem
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    2. COI have discovered that when the QGLWidget is the only widget and the centralWidget it works. But never in any other situation
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