<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Hi Robert,</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">the error I've reported is what I get with the env var already ON.</div><div class="gmail_default" style="font-family:tahoma,sans-serif">Unfortunately it doesn't add any more details.</div><div class="gmail_default" style="font-family:tahoma,sans-serif">Riccardo</div><br><div class="gmail_quote"><div dir="ltr">On Wed, Oct 17, 2018 at 12:56 PM Robert Osfield <<a href="mailto:robert.osfield@gmail.com">robert.osfield@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Hi Riccardo,</div><div><br></div><div>The OSG doesn't do fine grained GL error checking by default so when it does check for a GL error this error may have occurred many GL operations before, so while the error may have been reported just after a viewport is set it could well be prior operations that are the cause.</div><div><br></div><div>You can enable finer grained GL error checking by setting the OSG_GL_ERROR_CHECKING env var to ON i.e.</div><div><br></div><div> set OSG_GL_ERROR_CHECKING=ON</div><div><br></div><div>This will hopefully give you a more precise location of the error.</div><div><br></div><div>Robert.<br></div></div><br><div class="gmail_quote"><div dir="ltr">On Wed, 17 Oct 2018 at 11:43, Riccardo Corsi <<a href="mailto:riccardo.corsi@kairos3d.it" target="_blank">riccardo.corsi@kairos3d.it</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div style="font-family:tahoma,sans-serif">Hi all,</div><div style="font-family:tahoma,sans-serif"><br></div><div style="font-family:tahoma,sans-serif">when using my application with the Oculus I get the following GL error at every frame:</div><div><font face="tahoma, sans-serif"><i>Warning: detected OpenGL error 'invalid operation' after applying attribute Viewport </i></font><br></div><div style="font-family:tahoma,sans-serif"><br></div><div style="font-family:tahoma,sans-serif">This error is coming from the call <a href="https://github.com/openscenegraph/OpenSceneGraph/blob/master/src/osgUtil/RenderStage.cpp#L1333" target="_blank">RenderStage::drawImplementation()</a> but the _viewport is valid. I'm not so familiar with the backend to understand where this error might come from. </div><div style="font-family:tahoma,sans-serif">Any hint to debug this?</div><div style="font-family:tahoma,sans-serif"><br></div><div style="font-family:tahoma,sans-serif">Note: I'm using the Oculus through <a href="https://github.com/bjornblissing/osgoculusviewer" target="_blank">osgOculusViewer</a>. </div><div style="font-family:tahoma,sans-serif">The sample Oculus viewer works fine without GL errors. </div><div style="font-family:tahoma,sans-serif">My app is setup the same way, I cannot spot any sensible difference. </div><div style="font-family:tahoma,sans-serif"><br></div><div style="font-family:tahoma,sans-serif">I'm using win10, osg 3.6.3</div><div style="font-family:tahoma,sans-serif"><br></div><div style="font-family:tahoma,sans-serif">Thanks,</div><div style="font-family:tahoma,sans-serif">Riccardo</div><div><div dir="ltr" class="m_-3653787549299117125m_-2435056354969416332gmail-m_-2541790766576812713gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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