Hi all,
I was wondering if anyone has been successful in using the
NVX_gpu_memory_info extension with OpenSceneGraph, and the best place to
call glGetIntegerv to get the associated values.
Details on the extension here:
https://www.opengl.org/registry/specs/NVX/gpu_memory_info.txt
I'm using Linux, OSG 3.2.1, and a card that supports the
NVX_gpu_memory_info extension.
I have tried querying the current and total memory using
GPU_MEMORY_INFO_TOTAL_AVAILABLE_MEMORY_NVX and
GPU_MEMORY_INFO_CURRENT_AVAILABLE_VIDMEM_NVX, and in each case but one,
the values reported back are zero.
The only success I have had thus far has been querying the values via an
osg::Operation set with ViewerBase::setRealizeOperation() on my viewer
(osg::Viewer). The values returned appear to be correct. This allows me
to get the correct values *once* at the start of the program.
Unfortunately I need to query them periodically, and I have been unable
to do this.
So far, I have tried hooking the calls into:
- An osg::Camera::DrawHandler, set via
osg::Camera::setInitialDrawCallback().
- An osg::Node::NodeHandler, hooked into the root node via
osg::Node::setUpdateCallback.
- An osg::Drawable::DrawCallback, hooked into a dummy chain off the root
of: osg::Node -> osg::Geode -> osg::Geometry (osg::Drawable), via
osg::Drawable::setDrawCallback.
- An osg::Drawable::CullCallback , hooked into a dummy chain off the
root of: osg::Node -> osg::Geode -> osg::Geometry (osg::Drawable), via
osg::Drawable::setCullCallback.
- An osg::Camera::DrawHandler, set via
osg::Camera::setFinalDrawCallback(). Only partly-tested due to a
race-condition that occurs in my code, but appears to fail.
I have experimented with osg::GraphicsContext::makeCurrent() with each.
Can anyone suggest a better place to hook these calls into? Or
alternatively confirm that they have the extension working with one of
the above, so I can change or experiment with my existing setup to try
to make it work?
Cheers,
Garth
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