335 lines
11 KiB
C#
335 lines
11 KiB
C#
using System;
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using System.Collections.Generic;
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using Unity.Collections;
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using Unity.Mathematics;
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using UnityEngine;
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using UnityEngine.Experimental.Rendering;
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using UnityEngine.Rendering;
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using UnityEngine.Rendering.Universal;
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using static X.Rendering.Feature.HziCullingFeature;
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namespace X.Rendering.Feature
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{
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public class SceneRenderObjects
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{
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private static SceneRenderObjects intstance;
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public static SceneRenderObjects Instance => intstance;
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private float4[] centers;
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private float4[] sizes;
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private float3x2[] aabbs;
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List<Renderer> renderers = new();
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static SceneRenderObjects()
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{
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intstance = new SceneRenderObjects();
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}
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public void Register(Renderer renderer)
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{
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if(!renderers.Contains(renderer))
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{
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renderers.Add(renderer);
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}
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}
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public void UnRegister(Renderer renderer)
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{
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renderers.Remove(renderer);
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}
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public void UpdateAABB(ComputeBuffer aabbBuffer)
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{
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if(aabbBuffer == null || aabbs.Length != renderers.Count)
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{
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aabbs = new float3x2[renderers.Count];
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}
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for (int i = 0; i < renderers.Count; i++)
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{
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var rdr = renderers[i];
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if (rdr != null)
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{
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Bounds bounds = rdr.bounds;
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aabbs[i] = new float3x2(bounds.center,bounds.size);
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}
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else
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{
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aabbs[i] = float3x2.zero;
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}
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}
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aabbBuffer.SetData(aabbs);
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}
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public void UpdateAABB(Texture2D centerTex, Texture2D sizeTex)
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{
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if (centers == null || centers.Length != centerTex.width * centerTex.height)
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{
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centers = new float4[centerTex.width * centerTex.height];
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sizes = new float4[centerTex.width * centerTex.height];
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}
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if (renderers.Count == 0)
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{
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foreach (var item in GameObject.FindObjectsOfType<MeshRenderer>())
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{
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Register(item);
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}
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}
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int nullCnt = 0;
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for (int i = 0; i < renderers.Count; i++)
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{
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var rdr = renderers[i];
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if (rdr != null)
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{
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Bounds bounds = rdr.bounds;
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centers[i] = new float4(bounds.center, 1);
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sizes[i] = new float4(bounds.size, 1);
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}
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else
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{
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nullCnt++;
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centers[i] = float4.zero;
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sizes[i] = float4.zero;
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}
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}
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if (nullCnt == renderers.Count)
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{
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renderers.Clear();
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}
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centerTex.SetPixelData(centers, 0);
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centerTex.Apply();
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sizeTex.SetPixelData(sizes, 0);
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sizeTex.Apply();
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}
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internal void ApplyCull(CullResult cullResult)
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{
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if (cullResult.ReadDone)
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{
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for (var i = 0; i < renderers.Count; i++)
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{
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var rdr = renderers[i];
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if (rdr)
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{
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#if UNITY_EDITOR
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if(rdr.GetComponent<CullDebug>() is CullDebug cullDebug && cullDebug)
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{
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cullDebug.Index = i;
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cullDebug.IsCulled = cullResult.ResultArray[i] > 0;
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cullDebug.Position = centers[i].xyz;
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cullDebug.Size = sizes[i].xyz;
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}
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#endif
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//if (cullResult.ResultArray[i] > 0)
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//{
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// rdr.renderingLayerMask = 0;
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//}
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//else
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{
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rdr.renderingLayerMask = 1;
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}
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}
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}
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}
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}
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}
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public class HziCullingFeature : ScriptableRendererFeature
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{
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[Serializable]
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public class Settings
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{
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//TODO: 通过使用上一帧的摄像机位置（包括矩阵）和上一帧的深度图做剔除，储存已经被剔除的物体和未被剔除的物体，然后绘制未被剔除的物体到GBuffer（包含深度图），
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//再二次生成HiZ DepthTexture，并对已经被剔除的物体使用一遍新的深度和当前摄像机的位置做一次剔除判断
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public bool UseTowCullPass;
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public bool UseTextureAABB = true;
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public bool UseCompute;
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public Material CullMat;
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public ComputeShader CullShader;
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[Range(32, 128)]
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public int CullTextureSize = 64;
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public bool UseThreeFrameReadback = true;
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}
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[SerializeField]
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private Settings settings;
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private CullPass cullPass;
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public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData)
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{
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if (renderingData.cameraData.cameraType == CameraType.Game)
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{
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renderer.EnqueuePass(cullPass);
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}
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}
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public override void Create()
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{
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cullPass = new(settings);
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}
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protected override void Dispose(bool disposing)
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{
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base.Dispose(disposing);
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cullPass.Dispose();
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}
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internal class CullResult : IDisposable
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{
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public RenderTexture ResultTex;
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public NativeArray<half> ResultArray;
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public bool ReadDone = false;
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public Action<AsyncGPUReadbackRequest> ReadBackAction;
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private void ReadBack(AsyncGPUReadbackRequest readback)
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{
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if (readback.done && !readback.hasError)
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{
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var data = readback.GetData<half>();
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if (ResultArray.IsCreated)
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{
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ResultArray.CopyFrom(data);
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}
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ReadDone = true;
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}
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else
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{
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ReadDone = false;
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}
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}
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public CullResult CreateResources(int texSize)
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{
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ResultArray.Dispose();
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ResultArray = new NativeArray<half>(texSize * texSize, Allocator.Persistent);
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if(ResultTex != null)
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{
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ResultTex.Release();
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}
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ResultTex = new(texSize, texSize, 0, GraphicsFormat.R16_SFloat);
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ResultTex.filterMode = FilterMode.Point;
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ReadBackAction = ReadBack;
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return this;
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}
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public void Dispose()
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{
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if (ResultTex != null)
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{
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ResultTex.Release();
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}
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ResultTex = null;
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ResultArray.Dispose();
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}
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}
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internal class CullPass : ScriptableRenderPass, IDisposable
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{
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private Settings settings;
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private ProfilingSampler profiler;
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Texture2D centerTex;
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Texture2D sizeTex;
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CullResult[] cullResults;
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public CullPass(Settings settings)
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{
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profiler = new("Hi-Z Culling");
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this.settings = settings;
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int texSize = settings.CullTextureSize;
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centerTex = new Texture2D(texSize, texSize, GraphicsFormat.R32G32B32A32_SFloat, TextureCreationFlags.None);
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centerTex.filterMode = FilterMode.Point;
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sizeTex = new Texture2D(texSize, texSize, GraphicsFormat.R32G32B32A32_SFloat, TextureCreationFlags.None);
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sizeTex.filterMode = FilterMode.Point;
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cullResults = new CullResult[3]
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{
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new CullResult().CreateResources(texSize),
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new CullResult().CreateResources(texSize),
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new CullResult().CreateResources(texSize),
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};
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renderPassEvent = RenderPassEvent.AfterRendering;
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}
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public void Dispose()
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{
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Texture.DestroyImmediate(centerTex);
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Texture.DestroyImmediate(sizeTex);
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for (int i = 0; i < cullResults.Length; i++)
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{
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cullResults[i]?.Dispose();
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}
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}
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private int GetHizIndex()
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{
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if (settings.UseThreeFrameReadback)
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{
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return Time.frameCount % 3;
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}
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return 0;
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}
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private int GetLastCullIndex(int hizIndex)
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{
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switch (hizIndex)
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{
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case 0:
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return 1;
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case 1:
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return 2;
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case 2:
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return 0;
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default:
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throw new ArgumentException("参数错误 hizIndex:" + hizIndex);
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}
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}
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public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData)
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{
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var cmd = CommandBufferPool.Get("HizBuf");
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using var soc = new ProfilingScope(cmd, profiler);
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cmd.Clear();
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if (settings.UseTextureAABB)
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{
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SceneRenderObjects.Instance.UpdateAABB(centerTex, sizeTex);
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}
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var hizIndex = GetHizIndex();
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var cullResult = cullResults[hizIndex];
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SceneRenderObjects.Instance.ApplyCull(cullResults[GetLastCullIndex(hizIndex)]);
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cullResult.ReadDone = false;
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var world2Project = renderingData.cameraData.GetGPUProjectionMatrix() * renderingData.cameraData.GetViewMatrix();
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if(settings.UseCompute)
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{
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}
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else
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{
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world2Project.m11 *= -1;
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world2Project.m13 *= -1;
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cmd.SetGlobalMatrix(HizShaderIds.GPUCullingVPId, world2Project);
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cmd.SetGlobalTexture(HizShaderIds.ObjectAABBCenterId, centerTex);
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cmd.SetGlobalTexture(HizShaderIds.ObjectAABBSizeId, sizeTex);
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cmd.SetRenderTarget(cullResult.ResultTex, RenderBufferLoadAction.DontCare, RenderBufferStoreAction.Store);
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cmd.DrawMesh(RenderingUtils.fullscreenMesh, Matrix4x4.identity, settings.CullMat, 0, 0);
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var temp = new NativeArray<half>(centerTex.width * sizeTex.height, Allocator.Persistent);
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cmd.RequestAsyncReadbackIntoNativeArray(ref temp, cullResult.ResultTex, 0, cullResult.ReadBackAction);
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//cmd.RequestAsyncReadbackIntoNativeArray(ref cullResult.ResultArray, cullResult.ResultTex, 0, cullResult.ReadBackAction);
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}
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context.ExecuteCommandBuffer(cmd);
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CommandBufferPool.Release(cmd);
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}
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}
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}
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}
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