public void Update(SCNNode node)
{
foreach (var cloth in this.clothData)
{
var wind = new SCNVector3(1.8f, 0f, 0f);
// The multiplier is to rescale ball to flag model space.
// The correct value should be passed in.
var simData = new SimulationData(wind);
this.Deform(cloth.MeshData, simData);
}
}
public void Deform(ClothSimMetalNode mesh, SimulationData simData)
{
var w = this.pipelineStateClothSim.ThreadExecutionWidth;
var threadsPerThreadgroup = new MTLSize((nint)w, 1, 1);
var threadgroupsPerGrid = new MTLSize((mesh.VertexCount + (int)w - 1) / (int)w, 1, 1);
var clothSimCommandBuffer = this.commandQueue.CommandBuffer();
var clothSimCommandEncoder = clothSimCommandBuffer?.ComputeCommandEncoder;
if (clothSimCommandEncoder != null)
{
clothSimCommandEncoder.SetComputePipelineState(pipelineStateClothSim);
clothSimCommandEncoder.SetBuffer(mesh.Vb1, 0, 0);
clothSimCommandEncoder.SetBuffer(mesh.Vb2, 0, 1);
clothSimCommandEncoder.SetBuffer(mesh.VelocityBuffers[mesh.CurrentBufferIndex], 0, 2);
mesh.CurrentBufferIndex = (mesh.CurrentBufferIndex + 1) % 2;
clothSimCommandEncoder.SetBuffer(mesh.VelocityBuffers[mesh.CurrentBufferIndex], 0, 3);
//var pointer = System.Runtime.InteropServices.Marshal.GetComInterfaceForObject(simData, typeof(SimulationData));
//clothSimCommandEncoder?.SetBytes(pointer, (nuint)System.Runtime.InteropServices.Marshal.SizeOf<SimulationData>(), 4);
clothSimCommandEncoder.DispatchThreadgroups(threadgroupsPerGrid, threadsPerThreadgroup: threadsPerThreadgroup);
clothSimCommandEncoder.EndEncoding();
}
clothSimCommandBuffer?.Commit();
//
var normalComputeCommandBuffer = this.commandQueue.CommandBuffer();
var normalComputeCommandEncoder = normalComputeCommandBuffer?.ComputeCommandEncoder;
if (normalComputeCommandEncoder != null)
{
normalComputeCommandEncoder.SetComputePipelineState(pipelineStateNormalUpdate);
normalComputeCommandEncoder.SetBuffer(mesh.Vb2, 0, 0);
normalComputeCommandEncoder.SetBuffer(mesh.Vb1, 0, 1);
normalComputeCommandEncoder.SetBuffer(mesh.NormalWorkBuffer, 0, 2);
normalComputeCommandEncoder.DispatchThreadgroups(threadgroupsPerGrid, threadsPerThreadgroup);
normalComputeCommandEncoder.EndEncoding();
}
normalComputeCommandBuffer?.Commit();
//
var normalSmoothComputeCommandBuffer = this.commandQueue.CommandBuffer();
var normalSmoothComputeCommandEncoder = normalSmoothComputeCommandBuffer?.ComputeCommandEncoder;
if (normalSmoothComputeCommandEncoder != null)
{
normalSmoothComputeCommandEncoder.SetComputePipelineState(pipelineStateNormalSmooth);
normalSmoothComputeCommandEncoder.SetBuffer(mesh.NormalWorkBuffer, 0, 0);
normalSmoothComputeCommandEncoder.SetBuffer(mesh.NormalBuffer, 0, 1);
normalSmoothComputeCommandEncoder.DispatchThreadgroups(threadgroupsPerGrid, threadsPerThreadgroup);
normalSmoothComputeCommandEncoder.EndEncoding();
}
normalSmoothComputeCommandBuffer?.Commit();
}
