Is there a way to have a layer shader work on both its own layer and the background?

dustingunn · November 17, 2021 at 12:28 AM

I can get my shader working with its own layer via the standard: "Out.Color = tex2D(Texture0, coord);"

I can get it to work for everything under that layer via: "Out.Color = tex2D(bkd, coord);"

I can't think of any way to get it to work for everything. I could always make another layer above everything and sample the background from there, but I'm wondering if there's a method of doing this with HLSL?

NaitorStudios · November 17, 2021 at 12:32 AM

Sure, just check the photoshop effects for Fusion, it uses both the own image and what's behind it to archive the results.

dustingunn · November 17, 2021 at 12:41 AM

Looking at the photoshop effects, they seem to use the sprite layer to alter the background layer. I'm not sure how to apply that towards making the effect apply to the unaltered combination of current and background layers.

NaitorStudios · November 17, 2021 at 10:20 AM

When you apply a shader to the layer, the layer is the "sprite", it can't differentiate a Active or a layer, it treats it the same way.
So if you have a empty layer, it will not work, you need at least 1px that's not completely transparent to make it kicks in.

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