void FRCPassPostProcessWeightedSampleSum::DrawClear(FRHICommandListImmediate& RHICmdList, ERHIFeatureLevel::Type FeatureLevel, bool bDoFastBlur, FIntRect SrcRect, FIntRect DestRect, FIntPoint DestSize) const
{
if (bDoFastBlur)
{
AdjustRectsForFastBlur(SrcRect, DestRect);
}
DrawClearQuad(RHICmdList, FeatureLevel, true, FLinearColor(0, 0, 0, 0), false, 1.0f, false, 0, DestSize, DestRect);
}
void FRCPassPostProcessDownsample::Process(FRenderingCompositePassContext& Context)
{
const FPooledRenderTargetDesc* InputDesc = GetInputDesc(ePId_Input0);
if(!InputDesc)
{
// input is not hooked up correctly
return;
}
const FSceneView& View = Context.View;
const FSceneViewFamily& ViewFamily = *(View.Family);
FIntPoint SrcSize = InputDesc->Extent;
FIntPoint DestSize = PassOutputs[0].RenderTargetDesc.Extent;
// e.g. 4 means the input texture is 4x smaller than the buffer size
uint32 ScaleFactor = FMath::DivideAndRoundUp(FSceneRenderTargets::Get(Context.RHICmdList).GetBufferSizeXY().Y, SrcSize.Y);
FIntRect SrcRect = View.ViewRect / ScaleFactor;
FIntRect DestRect = FIntRect::DivideAndRoundUp(SrcRect, 2);
SrcRect = DestRect * 2;
SCOPED_DRAW_EVENTF(Context.RHICmdList, Downsample, TEXT("Downsample %dx%d"), DestRect.Width(), DestRect.Height());
const FSceneRenderTargetItem& DestRenderTarget = PassOutputs[0].RequestSurface(Context);
// check if we have to clear the whole surface.
// Otherwise perform the clear when the dest rectangle has been computed.
auto FeatureLevel = Context.View.GetFeatureLevel();
if (FeatureLevel == ERHIFeatureLevel::ES2 || FeatureLevel == ERHIFeatureLevel::ES3_1)
{
// Set the view family's render target/viewport.
SetRenderTarget(Context.RHICmdList, DestRenderTarget.TargetableTexture, FTextureRHIRef(), ESimpleRenderTargetMode::EClearColorAndDepth);
Context.SetViewportAndCallRHI(0, 0, 0.0f, DestSize.X, DestSize.Y, 1.0f );
}
else
{
// Set the view family's render target/viewport.
SetRenderTarget(Context.RHICmdList, DestRenderTarget.TargetableTexture, FTextureRHIRef(), ESimpleRenderTargetMode::EExistingColorAndDepth);
Context.SetViewportAndCallRHI(0, 0, 0.0f, DestSize.X, DestSize.Y, 1.0f );
DrawClearQuad(Context.RHICmdList, Context.GetFeatureLevel(), true, FLinearColor(0, 0, 0, 0), false, 1.0f, false, 0, DestSize, DestRect);
}
// set the state
Context.RHICmdList.SetBlendState(TStaticBlendState<>::GetRHI());
Context.RHICmdList.SetRasterizerState(TStaticRasterizerState<>::GetRHI());
Context.RHICmdList.SetDepthStencilState(TStaticDepthStencilState<false, CF_Always>::GetRHI());
// InflateSize increases the size of the source/dest rectangle to compensate for bilinear reads and UIBlur pass requirements.
int32 InflateSize;
// if second input is hooked up
if (IsDepthInputAvailable())
{
// also put depth in alpha
InflateSize = 2;
SetShader<2>(Context, InputDesc);
}
else
{
if (Quality == 0)
{
SetShader<0>(Context, InputDesc);
InflateSize = 1;
}
else
{
SetShader<1>(Context, InputDesc);
InflateSize = 2;
}
}
TShaderMapRef<FPostProcessDownsampleVS> VertexShader(Context.GetShaderMap());
DrawPostProcessPass(
Context.RHICmdList,
DestRect.Min.X, DestRect.Min.Y,
DestRect.Width(), DestRect.Height(),
SrcRect.Min.X, SrcRect.Min.Y,
SrcRect.Width(), SrcRect.Height(),
DestSize,
SrcSize,
*VertexShader,
View.StereoPass,
false, // This pass is input for passes that can't use the hmd mask, so we need to disable it to ensure valid input data
EDRF_UseTriangleOptimization);
Context.RHICmdList.CopyToResolveTarget(DestRenderTarget.TargetableTexture, DestRenderTarget.ShaderResourceTexture, false, FResolveParams());
}
