Hi,
captureCurrentState name is misleading - it is not capturing state from
OpenGL.
It should be, maybe, getCurrentState. It is just taking last pushed
attributes on the state stack. These attributes are returned in the
StateSet given as parameter. Thus, the function should work any time
during cull traversal, I guess.
I do not understand, but it work with SingleThreaded and
CullDrawThreadPerContext while it crashes with DrawThreadPerContext and
CullThreadPerCameraDrawThreadPerContext. It seems to me like two
threads are accessing state stack...
John
Wojciech Lewandowski wrote:
Hi,
I don't think its allowed to call captureCurrentState in Cull stage. I
am not certain about this, but would expect that captureCurrentState
would read OpenGL state and update osg::State accordingly. If this is
the case then it does require valid OpenGL context, which is only
guaranteed to be valid in Render stage. SingleThreaded mode is bit
different and manages SceneViews differently which has the side effect
that OpenGL context often remains valid beetwen Render stages .
Wojtek
--------------------------------------------------
From: "PCJohn" <[email protected]>
Sent: Tuesday, August 03, 2010 4:38 PM
To: "OpenSceneGraph Users" <[email protected]>
Subject: [osg-users] threading and captureCurrentState
Hi,
I see a threading issue when capturing current attributes in cull phase.
My code placed in my derived ShadowTechnique::cull():
void MyShadowVolume::cull( osgUtil::CullVisitor& cv )
{
ref_ptr< StateSet > currentState = new StateSet;
cv.getState()->captureCurrentState( *currentState );
cv.pushStateSet( _ss1 );
_shadowedScene->Group::traverse( cv );
cv.popStateSet();
cv.pushStateSet( _ss2 );
_shadowedScene->Group::traverse( cv );
cv.popStateSet();
}
StateSets are not changing. It crashes inside captureCurrentState
while I have to wait few seconds. However, the time changes
(race-condition?). It looks like threading issue and if I set
viewer.setThreadingModel( SingleThreaded ), the problem seems to
disappear.
Is the code above correct? Am I using captureCurrentState correctly?
I need it to determine FrontFace attribute settings.
Thanks,
John
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