Eric Sokolowsky wrote:
Mathias Buhr wrote:
Hi everyone,
I'm trying to use the stencil buffer to render only parts of the final
image through other graph-attached cameras. The app works fine on ATI
hardware but NVIDIA fails. OpenGL reports that the stencil buffer has
only 0 bits (which is 8 bits on ATI, via
glGetInterv(GL_STENCIL_BUFFER_BITS) in a DrawCallback). I have tested
this on various linux boxes (Ubuntu 9.04, Fedora 11) with recent
hardware and recent drivers.
I'm pretty sure that a stencil buffer is available on this hardware
because OSG seems to be able to utilize it (stereo-mode in
osgUtil::SceneView uses stenciling and works fine). I'm pretty sure I've
missed something. Is there anything special to do to get or enable a
stencil buffer on Nvidia?
The stencil property of GraphicsContext::Traits is 0 by default. Just
set it to 8 before creating the GraphicsContext and it should work. For
example:
osg::ref_ptr<osg::GraphicsContext::Traits> traits =
new osg::GraphicsContext::Traits;
traits->x = 100;
traits->y = 100;
traits->width = 640;
traits->height = 480;
traits->windowDecoration = true;
traits->doubleBuffer = true;
traits->red = 8;
traits->green = 8;
traits->blue = 8;
traits->depth = 24;
traits->stencil = 8;
traits->sharedContext = 0;
osg::ref_ptr<osg::GraphicsContext> gc =
osg::GraphicsContext::createGraphicsContext(traits.get());
--"J"
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