Postprocessing - binding shader variables

Hi,

I'm trying to properly bind the input textures to the posteffect's layer's
shader, and I have some questions:
What's the correct way to do that?

What csShaderVariableStack does?

I also tried without success:

csRef<csShaderVariable> sv =
iShader->GetVariableAdd(manager->svStrings->Request (inp.svTextureName))
sv->SetValue(inp.inputTexture);


Thanks,
Pedro.

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