Hi OSG folks,
I have a problem on saving screen image. Im using osg2.0 compositeViewer
and a slave camera to catch screen shot generated by master camera, through
a snap image post draw call back deriving from osg::Camera::DrawCallback, in
a wxWidgets environment. It works well for FBO. Unfortunately it doesnt
work (black empty image) for some graphic card not supporting FBO. When I
change to osg::Camera::PIXEL_BUFFER or osg::Camera::PIXEL_BUFFER_RTT with
slave cameras setRenderTargetImplementation it causes a crash at
Renderstage::draw because callingContext is NULL. Here is the callback:
osg25-osgd.dll!osg::GraphicsContext::releaseContext() Line 527
+ 0x3 bytes C++
> osg25-osgUtild.dll!osgUtil::RenderStage::draw(osg::RenderInfo &
renderInfo={...}, osgUtil::RenderLeaf * & previous=0x00000000) Line 854 +
0xb bytes C++
osg25-osgUtild.dll!osgUtil::SceneView::draw() Line 1454 + 0x34
bytes C++
osg25-osgViewerd.dll!osgViewer::Renderer::cull_draw() Line 506
+ 0xf bytes C++
osg25-osgViewerd.dll!osgViewer::Renderer::operator()(osg::Graphi
csContext * context=0x0952c5d0) Line 569 C++
osg25-osgd.dll!osg::GraphicsContext::runOperations() Line 671 +
0x33 bytes C++
osg25-osgViewerd.dll!osgViewer::ViewerBase::renderingTraversals(
) Line 651 + 0x15 bytes C++
osg25-osgViewerd.dll!osgViewer::ViewerBase::frame(double
simulationTime=1.7976931348623157e+308) Line 578 + 0xf bytes C++
By checking the mail list I found the bug was reported before but I cannot
find the solution. Any progress or advice on this problem?
Also I found Robert ever suggest to use a fallback mechanism for PBUFEER,
how it works? Anyone has ever successfully tried that?
Thanks,
Jansen
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