【Unity】ShaderGraphで使用できる半透明オブジェクト含む背景テクスチャ_CameraTransparentTextureã‚’ä½œæˆã€è¡¨ç¤ºã§ãã‚‹ãƒ‘ã‚¹ã‚’è¿½åŠ ã™ã‚‹(RenderGraph版)

はじめに

bravememo.hatenablog.com

これのRenderGraph版のやり方を紹介します

環境は Unity 6.0.0b12です

コード

using UnityEngine;
using UnityEngine.Rendering.Universal;
using UnityEngine.Rendering;
using UnityEngine.Rendering.RenderGraphModule;
using UnityEngine.Experimental.Rendering;


public class TransparentRendererFeature : ScriptableRendererFeature
{
    private CopyTransparentPass copyTransparentsPass = null;//パス
    public RenderPassEvent renderPassEvent = RenderPassEvent.AfterRenderingTransparents;//レンダリングタイミング
    public Downsampling downsampling;//解像度指定

    /// <summary>
    /// パス生成
    /// </summary>
    public override void Create()
    {
        copyTransparentsPass = new CopyTransparentPass(renderPassEvent, downsampling);
    }

    /// <summary>
    /// パス登録する
    /// </summary>
    /// <param name="renderer"></param>
    /// <param name="renderingData"></param>
    public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData)
    {
        //パスを実行できるようにする
        renderer.EnqueuePass(copyTransparentsPass);
    }

    protected override void Dispose(bool disposing)
    {

        copyTransparentsPass?.Dispose();
        copyTransparentsPass = null;
    }
}
/// <summary>
/// 半透明を含むカメラの描画結果をグローバルテクスチャに設定するためのパス
/// </summary>

public class CopyTransparentPass : ScriptableRenderPass
{

    public CopyTransparentPass(RenderPassEvent passEvent, Downsampling downsampling)
    {
        renderPassEvent = passEvent;
        this.downsampling = downsampling;
    }

    private class PassData
    {
        public TextureHandle CameraColorHandle;
    }
    private readonly Vector4 scaleBias = new Vector4(1f, 1f, 0f, 0f);
    private readonly int textureID = Shader.PropertyToID("_CameraTransparentTexture");
    const string ProfilerTag = "TestPass";//FrameDebuggerで表示される名前
    private Downsampling downsampling;
    private RTHandle outputHandle; //コピー先



    public override void RecordRenderGraph(RenderGraph renderGraph, ContextContainer frameData)
    {
        var cameraData = frameData.Get<UniversalCameraData>();
        var resourceData = frameData.Get<UniversalResourceData>();

    
        var desc = cameraData.cameraTargetDescriptor;
        //解像度を下げる
        var down = downsampling switch
        {
            Downsampling._2xBilinear => 2,
            Downsampling._4xBilinear => 4,
            Downsampling._4xBox => 4,
            _ => 1
        };
        desc.width /= down;
        desc.height /= down;
        //depthとStencilは使用しないので無効にする これをしないと正常に描画がされない
        desc.depthStencilFormat = GraphicsFormat.None;
        RenderingUtils.ReAllocateHandleIfNeeded(ref outputHandle, desc, FilterMode.Bilinear, TextureWrapMode.Clamp,
            name: "ScreenCaptureHandle");
        //コピー元
        var source = resourceData.activeColorTexture;
        var destination = renderGraph.ImportTexture(outputHandle);

        using (var builder = renderGraph.AddRasterRenderPass<PassData>(ProfilerTag, out var passData))
        {
            if (!source.IsValid() || !destination.IsValid()) return;

            passData.CameraColorHandle = source;
          
            builder.UseTexture(source);
            builder.SetRenderAttachment(destination, 0);
            builder.SetRenderAttachmentDepth(resourceData.activeDepthTexture);
            //グローバル変数の使用を許可
            builder.AllowGlobalStateModification(true);
            //グローバル変数設定
            builder.SetGlobalTextureAfterPass(destination, textureID);
   
            //描画
            builder.SetRenderFunc((PassData data, RasterGraphContext context) => ExecutePass(data, context));
        }
    }

    private void ExecutePass(PassData data, RasterGraphContext context)
    {
        using (new ProfilingScope(context.cmd, profilingSampler))
        {
            bool bilinear = downsampling == Downsampling._2xBilinear || downsampling == Downsampling._4xBilinear;
            //描画結果をコピーする
            Blitter.BlitTexture(context.cmd, data.CameraColorHandle, scaleBias, 0, bilinear);
     
        }
    }

    public void Dispose()
    {
        outputHandle?.Release();
    }


}