【Unity】RendererFeature を利用した PostProcess 用のテンプレート

Unity2021.3.15f1. URP 12.1.8

※URP14の場合はこちら

PostProcess 用のスクリプトをたまに忘れるのでこちらにメモしておきます

using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;
 
[Serializable]
public class SampleRendererFeature : ScriptableRendererFeature
{
    [SerializeField]
    private Shader _shader;

    private SampleRendererPass _pass;
    
    public override void Create()
    {
        _pass = new SampleRendererPass();
        _pass.SetUp(_shader);
    }

    public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData)
    {
        renderer.EnqueuePass(_pass);
    }
}

public class SampleRendererPass : ScriptableRenderPass
{
    private Material _material;
    private const string _name = nameof(SampleRendererPass);

    public void SetUp(Shader shader)
    {
        if (shader == null)
            return;
        
        renderPassEvent = RenderPassEvent.AfterRenderingPostProcessing;
        _material = CoreUtils.CreateEngineMaterial(shader);
    }
    
    public override void Execute(ScriptableRenderContext context, ref RenderingData data)
    {
        if (_material == null
            || !data.cameraData.postProcessEnabled
            || data.cameraData.cameraType == CameraType.SceneView
            )
        {
            return;
        }
        
        var commandBuffer = CommandBufferPool.Get(_name);

        using (new ProfilingScope(commandBuffer, new ProfilingSampler(_name)))
        {
            Blit(commandBuffer, ref data, _material);
        }

        context.ExecuteCommandBuffer(commandBuffer);
        CommandBufferPool.Release(commandBuffer);
    }
}

PostProcess 用の 色反転 Shader

Shader "Hidden/SampleImageEffectShader"
{
    SubShader
    {
        Cull Off ZWrite Off ZTest Always

        Pass
        {
            HLSLPROGRAM
            #pragma vertex FullscreenVert
            #pragma fragment frag
            
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
            #include "Packages/com.unity.render-pipelines.universal/Shaders/PostProcessing/Common.hlsl"
            
            TEXTURE2D_X(_SourceTex);
            SAMPLER(sampler_SourceTex);

            half4 frag(Varyings i) : SV_Target
            {
                half4 col = SAMPLE_TEXTURE2D_X( _SourceTex, sampler_SourceTex, i.uv);
                col.rgb = 1 - col.rgb;
                return col;
            }
            
            ENDHLSL
        }
    }
}

FullscreenVert の中身はこのようになっています

Varyings FullscreenVert(Attributes input)
{
    Varyings output;
    UNITY_SETUP_INSTANCE_ID(input);
    UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);

#if _USE_DRAW_PROCEDURAL
    output.positionCS = GetQuadVertexPosition(input.vertexID);
    output.positionCS.xy = output.positionCS.xy * float2(2.0f, -2.0f) + float2(-1.0f, 1.0f); //convert to -1..1
    output.uv = GetQuadTexCoord(input.vertexID) * _ScaleBias.xy + _ScaleBias.zw;
#else
    output.positionCS = TransformObjectToHClip(input.positionOS.xyz);
    output.uv = input.uv;
#endif

    return output;
}