Hi Brad, Both names are OK. Wojtek is for friends. Wojciech is what I have in my id. As far as I remember OpenGL does not change error flag until its read thorugh glError. So its very probable that the error was set by an OpenGL function that was invoked few calls before glScissor. glIntrcept should show which call was really responsible for the error.
Cheers, Wojtek From: Brad Huber Sent: Thursday, September 10, 2009 7:19 PM To: 'OpenSceneGraph Users' Subject: Re: [osg-users] GL_SCISSOR_TEST error EDIT - Wojciech, not sure where I got Wojtek from. Sorry about that. -Brad From: [email protected] [mailto:[email protected]] On Behalf Of Brad Huber Sent: Thursday, September 10, 2009 10:52 AM To: 'OpenSceneGraph Users' Subject: Re: [osg-users] GL_SCISSOR_TEST error Wojtek, Thanks. Yes I think this is along the lines of what I'm seeing. It is the glScissor within RenderStage::drawImplementation. I am not using osg::Scissor or any sort of Stencil buffering. According to the Man page: http://www.opengl.org/documentation/specs/man_pages/hardcopy/GL/html/gl/scissor.html invalid value happens when either width or height is negative. I turned on the debug print in RenderStage::drawImplementation and I get the following: clearing 0B0C7DC8 0,0,800,600 clearing 0B0FC118 0,0,800,600 clearing 0BFE0290 0,0,800,600 clearing 0B110638 0,0,260,180 Warning: detected OpenGL error 'invalid value' after applying GLMode 0xc11 <repeated over and over per frame> So apparently the scissor fails when setting the width and height to 260 and 180 (which obviously aren't negative). Though those dimensions tell me that the failure happens for my Render to Texture (RTT) pass. I'm not quite sure what you mean by the FBO/PBuffer being initialized wrong. I'll have a look at that and also try glIntercept. PS The exact same code works on one machine but not on another OLD machine. Thanks! -Brad From: [email protected] [mailto:[email protected]] On Behalf Of Wojciech Lewandowski Sent: Thursday, September 10, 2009 3:06 AM To: OpenSceneGraph Users Subject: Re: [osg-users] GL_SCISSOR_TEST error Hi Brad, Does it happen in state.applyMode( GL_SCISSOR_TEST ) call inside RenderStage::drawImplementation method ? I saw such errors when RenderStage buffer (FBO/PBuffer) initialization went wrong. It just happens that GL_SCISSOR_TEST is first mode that is applied after RenderStage buffer intialization and apparently error during the buffer initalization may be mistakenly interpreted as glScissor issue when scissor is applied and tests glError. In fact, if RenderBuffer was not applied correctly it may be the case where passed scissor area rectangle may not match previously set RenderBuffer and will produce an error as well, but even then, it will be secondary issue to Render Buffer inititalization failure. I often use glIntercept to see what really happen in OpenGL under OSG wrapping. glIntercept does not work with multithreading but produces fairly well, informal logs when osgViewer is run in --SingleThreaded mode. Cheers, Wojtek ----- Original Message ----- From: Brad Huber To: [email protected] Sent: Wednesday, September 09, 2009 10:27 PM Subject: [osg-users] GL_SCISSOR_TEST error Hello, I seem to be getting the error "Warning: detected OpenGL error 'invalid value' after applying GLMode" which has been mentioned in other threads. After setting the OSG_GL_ERROR_CHECKING environment variable to ONCE_PER_ATTRIBUTE I get the more descriptive string "Warning: detected OpenGL error 'invalid value' after applying GLMode 0xc11" This code corresponds to GL_SCISSOR_TEST mode. When this warning is printed I traced up the call stack to see that it's from the call state.applyMode( GL_SCISSOR_TEST, true ); in osg::RenderStage::drawImplementation. My question is does anyone know why I would be getting this message with GL_SCISSOR_TEST? This test is being run on an older machine with an Intel 815 GM graphics chip. Is it possible scissor isn't supported or something? PS I'm using rev 10555 of OSG from the trunk Thanks in advance, -Brad ------------------------------------------------------------------------------ _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -------------------------------------------------------------------------------- _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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