Am 19.01.2015 21:27, schrieb Robert Osfield:
Hi Sebastian,
I haven't had chance to try and reproduce the bug yet. The
description sounds like there an initialization order issue with the
osg::State. In theory the osg::State object now does the
initalization, and the osg::GraphicsContext on the first makeCurrent()
should ensure that it's set up correctly, in theory this should be the
first set of OpenGL calls made.
What is application you are testing within? What is the platform?
Windows 7, VisualStudio 2010.
It is crashing in a minimal application as well as using osgviewer.
Have you tried to use my minimal database? It reproduces the crash when
loading it with the osgviewer and stiring around with the mouse a bit.
(Also take a look at the attached picture: It shows a messed up State)
I was able to fix the crash by removing the
GLExentsions::Set(contextId,0) in the State destructor. But this seems
plain wrong. I suspect on my platform, the State is cleared and
reinitialized for some reason.
When I can spent some time on this, I can try to create a minimal
example. Just out of curiosity: Is there any reason for the State to
remove the extensions for the ContextID? I suspect there is only one
State per Context, which seems ok, but I cannot grasp, why it is
released in my scenario.
Also I had problems after the fix loading other databases; It seems the
range lists in paging are invalid. It randomly displays the wrong tiles
with wrong facing. I'll try to hunt this down too.
Any suggestions how to narrow down the problem on my side?
Cheers
Sebastian
Robert.
On 19 January 2015 at 10:07, Sebastian Messerschmidt
<sebastian.messerschm...@gmx.de
<mailto:sebastian.messerschm...@gmx.de>> wrote:
Hi Robert,
as already written, the problem is an invalidated _extensions object.
It seems to be invalidated by the State destructor, which causes
the destructor of the GLExtensions object to be called. (I've got
there using a memory breakpoint)
I've attached a callstack for analysis. (i've added a destructor
for the GLExtensions for testing)
Cheers
Sebastian
<snip>
osg116-osgd.dll!osg::Referenced::~Referenced() Line 234 C++
osg116-osgd.dll!osg::GLExtensions::~GLExtensions() + 0x28
bytes C++
osg116-osgd.dll!osg::GLExtensions::`vector deleting
destructor'() + 0x7d bytes C++
osg116-osgd.dll!osg::Referenced::signalObserversAndDelete(bool
signalDelete, bool doDelete) Line 324 + 0x31 bytes C++
osg116-osgd.dll!osg::Referenced::unref() Line 200 C++
osg116-osgd.dll!osg::ref_ptr<osg::GLExtensions>::operator=(osg::GLExtensions
* ptr) Line 59 C++
osg116-osgd.dll!osg::GLExtensions::Set(unsigned int
contextID, osg::GLExtensions * extensions) Line 429 C++
> osg116-osgd.dll!osg::State::~State() Line 136 C++
osg116-osgUtild.dll!osg::State::`scalar deleting
destructor'() + 0x2d bytes C++
osg116-osgd.dll!osg::Referenced::signalObserversAndDelete(bool
signalDelete, bool doDelete) Line 324 + 0x31 bytes C++
osg116-osgd.dll!osg::Referenced::unref() Line 200 C++
osg116-osgUtild.dll!osg::ref_ptr<osg::State>::operator=(osg::State
* ptr) Line 59 C++
osg116-osgUtild.dll!osg::RenderInfo::setState(osg::State * state)
Line 57 + 0x32 bytes C++
osg116-osgUtild.dll!osgUtil::SceneView::setState(osg::State *
state) Line 184 + 0x3b bytes C++
osg116-osgViewerd.dll!osgViewer::Renderer::updateSceneView(osgUtil::SceneView
* sceneView) Line 517 C++
osg116-osgViewerd.dll!osgViewer::Renderer::cull() Line 625 C++
osg116-osgViewerd.dll!osgViewer::ViewerBase::renderingTraversals()
Line 826 C++
osg116-osgViewerd.dll!osgViewer::ViewerBase::frame(double
simulationTime) Line 677 C++
osg116-osgViewerd.dll!osgViewer::ViewerBase::run() Line
647 C++
osg116-osgViewerd.dll!osgViewer::Viewer::run() Line 420 C++
RenderTest_d.exe!main(int argc, char * * argv) Line 66 + 0xb
bytes C++
RenderTest_d.exe!__tmainCRTStartup() Line 555 + 0x19 bytes C
RenderTest_d.exe!mainCRTStartup() Line 371 C
</snip>
Hi Robert,
would you expect problems with old osgTerrain databases (build
with ~3.2.0, osgb format)?
I have some strange behaviour with a huge database, which simply
not displayed anymore and somehow breaks state (See attached
picture).
Also there is a warning coming from an optimzer I guess:
Warning: CollectLowestTransformsVisitor::removeTransforms()
error, encountered a NULL Transform pointer
A second, much smaller database is sometimes displayed, but
crashes the viewer sometimes.
Unfortunately my first email, containing a database didn't get
through.
It is really hard to find the culprit.
Any hints?
I'll investigate the issue further ...
Cheers
Sebastian
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