public TextureHandle HistoryValidity(RenderGraph renderGraph, HDCamera hdCamera, HistoryValidityParameters parameters,
TextureHandle depthBuffer, TextureHandle normalBuffer, TextureHandle motionVectorBuffer)
{
using (var builder = renderGraph.AddRenderPass <HistoryValidityPassData>("History Validity Evaluation", out var passData, ProfilingSampler.Get(HDProfileId.HistoryValidity)))
{
// Cannot run in async
builder.EnableAsyncCompute(false);
// Fetch all the resources
passData.parameters = parameters;
// Input Buffers
passData.depthStencilBuffer = builder.ReadTexture(depthBuffer);
passData.normalBuffer = builder.ReadTexture(normalBuffer);
passData.motionVectorBuffer = builder.ReadTexture(motionVectorBuffer);
// History buffers
passData.historyDepthTexture = builder.ReadTexture(renderGraph.ImportTexture(hdCamera.GetCurrentFrameRT((int)HDCameraFrameHistoryType.Depth)));
passData.historyNormalTexture = builder.ReadTexture(renderGraph.ImportTexture(hdCamera.GetCurrentFrameRT((int)HDCameraFrameHistoryType.Normal)));
// Output buffers
passData.validationBuffer = builder.WriteTexture(renderGraph.CreateTexture(new TextureDesc(Vector2.one, true, true)
{
colorFormat = GraphicsFormat.R8_UNorm, enableRandomWrite = true, name = "ValidationTexture"
}));
builder.SetRenderFunc(
(HistoryValidityPassData data, RenderGraphContext ctx) =>
{
HistoryValidityResources resources = new HistoryValidityResources();
resources.depthStencilBuffer = data.depthStencilBuffer;
resources.normalBuffer = data.normalBuffer;
resources.motionVectorBuffer = data.motionVectorBuffer;
resources.historyDepthTexture = data.historyDepthTexture;
resources.historyNormalTexture = data.historyNormalTexture;
resources.validationBuffer = data.validationBuffer;
ExecuteHistoryValidity(ctx.cmd, data.parameters, resources);
});
return(passData.validationBuffer);
}
}
// Function that evaluates the history validation Buffer
static public void ExecuteHistoryValidity(CommandBuffer cmd, HistoryValidityParameters parameters, HistoryValidityResources resources)
{
// If we do not have a depth and normal history buffers, we can skip right away
if (resources.historyDepthTexture == null || resources.historyNormalTexture == null)
{
CoreUtils.SetRenderTarget(cmd, resources.validationBuffer, clearFlag: ClearFlag.Color, Color.black);
return;
}
// Evaluate the dispatch parameters
int areaTileSize = 8;
int numTilesX = (parameters.texWidth + (areaTileSize - 1)) / areaTileSize;
int numTilesY = (parameters.texHeight + (areaTileSize - 1)) / areaTileSize;
// First of all we need to validate the history to know where we can or cannot use the history signal
// Bind the input buffers
cmd.SetComputeTextureParam(parameters.temporalFilterCS, parameters.validateHistoryKernel, HDShaderIDs._DepthTexture, resources.depthStencilBuffer);
cmd.SetComputeTextureParam(parameters.temporalFilterCS, parameters.validateHistoryKernel, HDShaderIDs._HistoryDepthTexture, resources.historyDepthTexture);
cmd.SetComputeTextureParam(parameters.temporalFilterCS, parameters.validateHistoryKernel, HDShaderIDs._NormalBufferTexture, resources.normalBuffer);
cmd.SetComputeTextureParam(parameters.temporalFilterCS, parameters.validateHistoryKernel, HDShaderIDs._HistoryNormalTexture, resources.historyNormalTexture);
cmd.SetComputeTextureParam(parameters.temporalFilterCS, parameters.validateHistoryKernel, HDShaderIDs._CameraMotionVectorsTexture, resources.motionVectorBuffer);
cmd.SetComputeTextureParam(parameters.temporalFilterCS, parameters.validateHistoryKernel, HDShaderIDs._StencilTexture, resources.depthStencilBuffer, 0, RenderTextureSubElement.Stencil);
// Bind the constants
cmd.SetComputeFloatParam(parameters.temporalFilterCS, HDShaderIDs._HistoryValidity, parameters.historyValidity);
cmd.SetComputeFloatParam(parameters.temporalFilterCS, HDShaderIDs._PixelSpreadAngleTangent, parameters.pixelSpreadTangent);
cmd.SetComputeIntParam(parameters.temporalFilterCS, HDShaderIDs._ObjectMotionStencilBit, (int)StencilUsage.ObjectMotionVector);
// Bind the output buffer
cmd.SetComputeTextureParam(parameters.temporalFilterCS, parameters.validateHistoryKernel, HDShaderIDs._ValidationBufferRW, resources.validationBuffer);
// Evaluate the validity
cmd.DispatchCompute(parameters.temporalFilterCS, parameters.validateHistoryKernel, numTilesX, numTilesY, parameters.viewCount);
}
