モノトーンポストエフェクト - saitocastel1900/UnityShader GitHub Wiki

using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;

public class Grayscale : ScriptableRendererFeature
{
    [System.Serializable]
    public class GrayscaleSetting
    {
        // レンダリングの実行タイミング
        public RenderPassEvent renderPassEvent = RenderPassEvent.AfterRenderingTransparents;
    }

    /// <summary>
    /// Grayscale実行Pass
    /// </summary>
    class GrayScalePass : ScriptableRenderPass
    {
        private readonly string profilerTag = "GrayScale Pass";

        public Material grayscaleMaterial; // グレースケール計算用マテリアル

        public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData)
        {
            var cameraColorTarget = renderingData.cameraData.renderer.cameraColorTarget;

            // コマンドバッファ
            var cmd = CommandBufferPool.Get(profilerTag);

            // マテリアル実行
            cmd.Blit(cameraColorTarget, cameraColorTarget, grayscaleMaterial);

            context.ExecuteCommandBuffer(cmd);
        }
    }

    [SerializeField] private GrayscaleSetting settings = new GrayscaleSetting();
    private GrayScalePass scriptablePass;

    public override void Create()
    {
        var shader = Shader.Find("Unlit/MonoToneUnlitShader");
        if (shader)
        {
            scriptablePass = new GrayScalePass();
            scriptablePass.grayscaleMaterial = new Material(shader);
            scriptablePass.renderPassEvent = settings.renderPassEvent;
        }
    }

    public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData)
    {
        if (scriptablePass != null && scriptablePass.grayscaleMaterial != null)
        {
            renderer.EnqueuePass(scriptablePass);
        }
    }
}
}

Shader "Unlit/MonoToneUnlitShader"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 100

        Pass
        {
            CGPROGRAM
            #pragma vertex vert_img
            #pragma fragment frag
            
            #include "UnityCG.cginc"

            sampler2D _MainTex;
            
            fixed4 frag (v2f_img i) : COLOR
            {
                fixed4 color = tex2D(_MainTex,i.uv);
                float grayColor = color.r * 0.3 + color.g * 0.6 + color.b * 0.1;
                return fixed4(grayColor, grayColor, grayColor, color.a);
            }
            ENDCG
        }
    }
}