Hi
iirc you can use just integer uniform for any sampler, specific sampler type matters only inside glsl shader
Cheers.
20.02.2013, 13:25, "Christian Buchner" <[email protected]>:
I would have to switch to a later development release, which is a major undertaking.I am currently stuck with OSG 3.0.1 (latest stable release) not being able to provide an osg::Uniform corresponding to the GLSL sampler2DRectShadow. The enum does not yet contain the SAMPLER_2D_RECT_SHADOW type. ;-(
Alternatively I might have to switch from Texture Rectangles to regular Texture2D objects, fortunately there is a #define for that.Christian,2013/2/20 Mathias Fröhlich <[email protected]>
Hi,Without looking in depth into this and just out of my head.
On Tuesday, February 19, 2013 19:07:59 Christian Buchner wrote:
> After some futile attempts to make the nVidia dual depth peeling compatible
> with non-Vidia cards by dropping the vendor specific extensions I've
> decided to go forward with the DepthPeeling code from osgoit.
>
> I noticed that as soon as there are GLSL shaders attached to the object
> being rendered, the shadow depth testing seems to fail (is this fixed
> function stuff?). Or in other words, these statements don't have an effect
> anymore.
>
> _depthTextures[i]->setShadowComparison(true);
> _depthTextures[i]->setShadowAmbient(0); // The r value if the test
> fails
> _depthTextures[i]->setShadowCompareFunc(osg::Texture::GREATER);
> _depthTextures[i]->setShadowTextureMode(osg::Texture::INTENSITY);
>
> It seems that I will have to roll my own shadow comparison in GLSL. This
> would be in the fragment shader, I presume?
Yes, in the Fragment shader have a shadow sampler unifom bound on that texture
and compare for the .r component. Then discard the pixel if that test fails.
You need to rescale the projection space fragement position apropriately to
the input of the shadow sampler.
If I remember right there was also some problem with the demo with models not
being close to the origin. I believe something with the near far computation
in interaction with osgoit is not entirely correct.
Greetings
Mathias
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