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Optimize reflection probes rendering by using depth test to reject occluded pixels early

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This commit is contained in:
Wojtek Figat
2026-01-13 10:35:29 +01:00
parent e0062a6ff1
commit d9f90f726b
1 changed files with 7 additions and 3 deletions
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10
Source/Engine/Renderer/ReflectionsPass.cpp
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@@ -199,7 +199,7 @@ bool ReflectionsPass::setupResources()
psDesc.DepthEnable = true;
if (_psProbe->Init(psDesc))
return true;
psDesc.DepthFunc = ComparisonFunc::Greater;
psDesc.DepthFunc = ComparisonFunc::Always;
psDesc.CullMode = CullMode::Inverted;
if (_psProbeInside->Init(psDesc))
return true;
@@ -279,10 +279,14 @@ void ReflectionsPass::Render(RenderContext& renderContext, GPUTextureView* light
GBufferPass::SetInputs(view, data.GBuffer);
// Bind GBuffer inputs
GPUTexture* depthBuffer = renderContext.Buffers->DepthBuffer;
const bool depthBufferReadOnly = EnumHasAnyFlags(depthBuffer->Flags(), GPUTextureFlags::ReadOnlyDepthView);
GPUTextureView* depthBufferRTV = depthBufferReadOnly ? depthBuffer->ViewReadOnlyDepth() : nullptr;
GPUTextureView* depthBufferSRV = depthBufferReadOnly ? depthBuffer->ViewReadOnlyDepth() : depthBuffer->View();
context->BindSR(0, renderContext.Buffers->GBuffer0);
context->BindSR(1, renderContext.Buffers->GBuffer1);
context->BindSR(2, renderContext.Buffers->GBuffer2);
context->BindSR(3, renderContext.Buffers->DepthBuffer);
context->BindSR(3, depthBufferSRV);
auto tempDesc = GPUTextureDescription::New2D(renderContext.Buffers->GetWidth(), renderContext.Buffers->GetHeight(), PixelFormat::R11G11B10_Float);
auto reflectionsBuffer = RenderTargetPool::Get(tempDesc);
@@ -294,7 +298,7 @@ void ReflectionsPass::Render(RenderContext& renderContext, GPUTextureView* light
{
PROFILE_GPU_CPU("Env Probes");
context->SetRenderTarget(*reflectionsBuffer);
context->SetRenderTarget(depthBufferRTV, *reflectionsBuffer);
// Sort probes by the radius
Sorting::QuickSort(renderContext.List->EnvironmentProbes.Get(), renderContext.List->EnvironmentProbes.Count(), &SortProbes);