Hi Terry,
I haven't tried this myself, but it wouldn't surprise me if implementations were
a bit shakey.
Do other texture lookup functions beside shadow2D() work (or at least not
crash)? Or perhaps assign the specific sampler array element to a temporary
scalar sampler variable, etc.
Cheers
-- mew
Terry Welsh wrote:
> Hi,
> This is probably an OpenGL driver bug, but maybe I'm just setting
> something up wrong. Has anyone else tried to use an array of samplers
> in a GLSL shader? I'm setting up my array of samplers like this:
>
> shadowmapUniform = new Uniform(Uniform::SAMPLER_2D_SHADOW,
> "shadowmap", NUM_SHADOW_MAPS);
> for(i=0; i<NUM_SHADOW_MAPS; i++){
> sceneSS->setTextureAttributeAndModes(i+FIRST_SHADOW_TEX_UNIT,
> shadowmap[i].get(), StateAttribute::ON);
> shadowmapUniform->setElement(i, i+FIRST_SHADOW_TEX_UNIT);
> }
> sceneSS->addUniform(shadowmapUniform.get());
>
> The fragment shaders defines the samplers like this:
>
> uniform sampler2DShadow shadowmap[4];
>
> And it accesses one of them like this:
>
> float shadow = shadow2D(shadowmap[0], lsPosition).r;
>
> And then I get a segmentation fault. If I don't call the shadow2D
> function in the shader, everything keeps running and I just don't get
> any shadows. Has anyone else had any luck doing anything like this
> before, or does this look like a driver bug? I'm using an NVidia 6800GT
> on Linux with the 8762 driver.
> --
> Terry Welsh - mogumbo 'at' gmail.com <http://gmail.com>
> www.reallyslick.com <http://www.reallyslick.com> | www.mogumbo.com
> <http://www.mogumbo.com>
>
>
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