Test URP multi pass post effect
Unity 2019.3.3f1 URP 7.1.8
Strong recommend to update URP as 7.1.8 have bugs on IOS and Android.
This is a simple test for base idea. Normally would be creating a renderfeature script with menus that add "EnqueuePass" for each blit. (All my projects are using EnqueuePass, easy to stack post process on up another, change materials or add filters)
Shaders
This shaders are not URP! For fast test i didnt wrote them as supossed to be, HLSL.