Manual shaders in URP/HDRP

JonPQ · May 18, 2020, 6:27pm

What are the rules for manually writing shaders that render in the new Render Pipe-lines.
The update shaders option just replaces them all… so all existing custom functionality is lost…
but…they still compile ok, they just render magenta? so are they broken or not ?
How do we manually write a custom shader that renders properly in URP ?
What are the requirements/spec please? I cant find anything in the official documentation.
thanks

Namey5 · May 19, 2020, 1:55am

Here is a good template you can use as a basis for writing shaders for URP;

gist.github.com

https://gist.github.com/phi-lira/225cd7c5e8545be602dca4eb5ed111ba

UniversalPipelineTemplateShader.shader

// When creating shaders for Universal Render Pipeline you can you the ShaderGraph which is super AWESOME!
// However, if you want to author shaders in shading language you can use this teamplate as a base.
// Please note, this shader does not necessarily match perfomance of the built-in URP Lit shader.
// This shader works with URP 7.1.x and above
Shader "Universal Render Pipeline/Custom/Physically Based Example"
{
    Properties
    {
        // Specular vs Metallic workflow
        [HideInInspector] _WorkflowMode("WorkflowMode", Float) = 1.0

This file has been truncated. show original

You’ll need a few things to get a shader to draw in the new render pipelines. The main thing to note is that the new pipelines now work exclusively with single pass shaders, hence why the old multi-pass lit shaders are disabled.

To start, you’ll need to specify what RP you are working with in the subshader tags;

Tags {"RenderType"="Opaque" "RenderPipeline"="UniversalRenderPipeline" "IgnoreProjector"="True"}

You will also need to specify what each pass does through a LightMode tag;

//For the main URP lit pass
Tags { "LightMode"="UniversalForward" }

From there, the only main difference aside from lighting is that shaders are now written in HLSL instead of CG. The syntax is the same, but it won’t have the old includes that CGPROGRAM used to use automatically, meaning you may have to rewrite some functions yourself (‘LinearEyeDepth’, etc). For the above reasons, surface shaders are also no longer compatible.

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Manual shaders in URP/HDRP

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