DirectCanvasRenderPass.cs

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using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.RenderGraphModule;
using UnityEngine.Rendering.RenderGraphModule.Util;
using UnityEngine.Rendering.Universal;
 
namespace Spelunx
{
    // Todo: Execute to game view in edit mode?
    public class DirectCanvasRenderPass : ScriptableRenderPass
    {
        private Material blitMaterial;
 
        public DirectCanvasRenderPass(Material blitMaterial)
        {
            this.blitMaterial = blitMaterial;
            this.requiresIntermediateTexture = true;
            this.renderPassEvent = RenderPassEvent.AfterRendering;
        }
 
        public void SetMaterial(Material material)
        {
            blitMaterial = material;
        }
 
        public override void RecordRenderGraph(RenderGraph renderGraph, ContextContainer frameData)
        {
            const string name = "DirectCanvasRenderPass";
 
            // Get source.
            var resourceData = frameData.Get<UniversalResourceData>();
            if (resourceData.isActiveTargetBackBuffer) { return; }
            var source = resourceData.activeColorTexture;
 
            // Get destination.
            var destinationDesc = renderGraph.GetTextureDesc(source);
            destinationDesc.name = name;
            destinationDesc.clearBuffer = false;
            TextureHandle destination = renderGraph.CreateTexture(destinationDesc);
 
            // Add blit pass.
            RenderGraphUtils.BlitMaterialParameters para = new(source, destination, blitMaterial, 0);
            renderGraph.AddBlitPass(para, passName: name);
 
            resourceData.cameraColor = destination;
        }
    }
}