104 lines
4.7 KiB
C#
104 lines
4.7 KiB
C#
using UnityEngine;
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using UnityEngine.Rendering;
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using Unity.Profiling;
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using System.Collections.Generic;
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using Unity.Collections;
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namespace Obi
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{
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public class ComputeLineRopeRenderSystem : ObiLineRopeRenderSystem
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{
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private ComputeShader ropeShader;
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private int updateKernel;
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public ComputeLineRopeRenderSystem(ObiSolver solver) : base(solver)
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{
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ropeShader = GameObject.Instantiate(Resources.Load<ComputeShader>("Compute/RopeLineRendering"));
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updateKernel = ropeShader.FindKernel("UpdateLineMesh");
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}
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public override void Setup()
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{
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base.Setup();
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// Initialize each batch:
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for (int i = 0; i < batchList.Count; ++i)
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batchList[i].Initialize(layout, true);
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vertexOffsets.AsComputeBuffer<int>();
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triangleOffsets.AsComputeBuffer<int>();
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triangleCounts.AsComputeBuffer<int>();
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pathSmootherIndices.AsComputeBuffer<int>();
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rendererData.AsComputeBuffer<BurstLineMeshData>();
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pathSmootherSystem.chunkOffsets.AsComputeBuffer<int>();
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}
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public override void Render() { }
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public override void RenderFromCamera(Camera camera)
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{
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using (m_RenderMarker.Auto())
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{
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if (pathSmootherSystem == null)
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return;
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// Single array: Cannot merge into a single vertices array, otherwise we would need to bring back to CPU for passing indices to each mesh.
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// Individual meshes: Cannot do each renderer independently (like we do with cloth) since each rope is done sequentially, would not parallelize at all.
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// Batches: 1 mesh per batch: best approach, but 1) bounds must be calculated per or solver, so we can only cull entire solver. Culling happens on the CPU, cannot bring back bounds from the CPU.
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// Cloth and Softbodies are rendered manually, particles are too. So Ropes could too.
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// In Burst, we need merge all cloth mesh data into array for parallel processing, without using one schedule() per mesh.
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// So instead of writing slices of mesh data back to their original meshes, let's create one mesh per batch and draw it ourselves.
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// Basically the same as with ropes.
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if (pathSmootherSystem.chunkOffsets != null && pathSmootherSystem.chunkOffsets.count > 0)
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{
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ropeShader.SetBuffer(updateKernel, "pathSmootherIndices", pathSmootherIndices.computeBuffer);
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ropeShader.SetBuffer(updateKernel, "chunkOffsets", pathSmootherSystem.chunkOffsets.computeBuffer);
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ropeShader.SetBuffer(updateKernel, "frames", pathSmootherSystem.smoothFrames.computeBuffer);
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ropeShader.SetBuffer(updateKernel, "frameOffsets", pathSmootherSystem.smoothFrameOffsets.computeBuffer);
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ropeShader.SetBuffer(updateKernel, "frameCounts", pathSmootherSystem.smoothFrameCounts.computeBuffer);
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ropeShader.SetBuffer(updateKernel, "vertexOffsets", vertexOffsets.computeBuffer);
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ropeShader.SetBuffer(updateKernel, "triangleOffsets", triangleOffsets.computeBuffer);
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ropeShader.SetBuffer(updateKernel, "triangleCounts", triangleCounts.computeBuffer);
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ropeShader.SetBuffer(updateKernel, "rendererData", rendererData.computeBuffer);
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ropeShader.SetBuffer(updateKernel, "pathData", pathSmootherSystem.pathData.computeBuffer);
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ropeShader.SetVector("localSpaceCamera", m_Solver.transform.InverseTransformPoint(camera.transform.position));
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for (int i = 0; i < batchList.Count; ++i)
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{
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var batch = batchList[i];
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int threadGroups = ComputeMath.ThreadGroupCount(batch.rendererCount, 128);
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ropeShader.SetInt("firstRenderer", batch.firstRenderer);
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ropeShader.SetInt("rendererCount", batch.rendererCount);
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ropeShader.SetBuffer(updateKernel, "vertices", batch.gpuVertexBuffer);
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ropeShader.SetBuffer(updateKernel, "tris", batch.gpuIndexBuffer);
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ropeShader.Dispatch(updateKernel, threadGroups, 1, 1);
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var rp = batch.renderParams;
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rp.worldBounds = m_Solver.bounds;
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rp.camera = camera;
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Graphics.RenderMesh(rp, batch.mesh, 0, m_Solver.transform.localToWorldMatrix, m_Solver.transform.localToWorldMatrix);
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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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