Most of the legacy shaders do not longer work in GG.
1- If you want let's say a river then use a water diffuse texture and add "effect_scroll.fx" in the fpe file.
2- If you want some effect like tv then use "decal_animate4.fx" as a template, and modify it to fit your needs.
You'll need some texture sheet and it should be the same cols and rows, ie: 4x4, 8x8, 6x6, etc.
This is the shader part you'll has to modify:
If your texture sheet is 6x6 then where it says:
> = 8.000000;
It should be:
> = 6.000000;
Edit: cascade here is using a cascade texture plus "effect_scroll.fx" in the fpe file.
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