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549 lines
16 KiB
C++
549 lines
16 KiB
C++
// Copyright 1998-2014 Epic Games, Inc. All Rights Reserved.
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/*=============================================================================
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GPUBenchmark.cpp: GPUBenchmark to compute performance index to set video options automatically
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=============================================================================*/
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#include "RendererPrivate.h"
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#include "ScenePrivate.h"
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#include "SceneFilterRendering.h"
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#include "GPUBenchmark.h"
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static uint32 GBenchmarkResolution = 512;
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DEFINE_LOG_CATEGORY_STATIC(LogSynthBenchmark, Log, All);
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// todo: get rid of global
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FRenderQueryPool GTimerQueryPool(RQT_AbsoluteTime);
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/** Encapsulates the post processing down sample pixel shader. */
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template <uint32 Method>
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class FPostProcessBenchmarkPS : public FGlobalShader
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{
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DECLARE_SHADER_TYPE(FPostProcessBenchmarkPS, Global);
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static bool ShouldCache(EShaderPlatform Platform)
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{
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return IsFeatureLevelSupported(Platform, ERHIFeatureLevel::SM3);
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}
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static void ModifyCompilationEnvironment(EShaderPlatform Platform, FShaderCompilerEnvironment& OutEnvironment)
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{
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FGlobalShader::ModifyCompilationEnvironment(Platform, OutEnvironment);
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OutEnvironment.SetDefine(TEXT("METHOD"), Method);
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}
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/** Default constructor. */
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FPostProcessBenchmarkPS() {}
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public:
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FShaderResourceParameter InputTexture;
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FShaderResourceParameter InputTextureSampler;
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/** Initialization constructor. */
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FPostProcessBenchmarkPS(const ShaderMetaType::CompiledShaderInitializerType& Initializer)
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: FGlobalShader(Initializer)
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{
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InputTexture.Bind(Initializer.ParameterMap,TEXT("InputTexture"));
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InputTextureSampler.Bind(Initializer.ParameterMap,TEXT("InputTextureSampler"));
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}
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// FShader interface.
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virtual bool Serialize(FArchive& Ar)
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{
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bool bShaderHasOutdatedParameters = FGlobalShader::Serialize(Ar);
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Ar << InputTexture << InputTextureSampler;
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return bShaderHasOutdatedParameters;
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}
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void SetParameters(FRHICommandList& RHICmdList, const FSceneView& View, TRefCountPtr<IPooledRenderTarget>& Src)
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{
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const FPixelShaderRHIParamRef ShaderRHI = GetPixelShader();
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FGlobalShader::SetParameters(RHICmdList, ShaderRHI, View);
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SetTextureParameter(RHICmdList, ShaderRHI, InputTexture, InputTextureSampler, TStaticSamplerState<>::GetRHI(), Src->GetRenderTargetItem().ShaderResourceTexture);
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}
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static const TCHAR* GetSourceFilename()
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{
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return TEXT("GPUBenchmark");
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}
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static const TCHAR* GetFunctionName()
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{
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return TEXT("MainPS");
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}
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};
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// #define avoids a lot of code duplication
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#define VARIATION1(A) typedef FPostProcessBenchmarkPS<A> FPostProcessBenchmarkPS##A; \
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IMPLEMENT_SHADER_TYPE2(FPostProcessBenchmarkPS##A, SF_Pixel);
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VARIATION1(0) VARIATION1(1) VARIATION1(2) VARIATION1(3) VARIATION1(4)
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#undef VARIATION1
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/** Encapsulates the post processing down sample vertex shader. */
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class FPostProcessBenchmarkVS : public FGlobalShader
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{
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DECLARE_SHADER_TYPE(FPostProcessBenchmarkVS,Global);
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public:
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static bool ShouldCache(EShaderPlatform Platform)
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{
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return true;
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}
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/** Default constructor. */
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FPostProcessBenchmarkVS() {}
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/** Initialization constructor. */
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FPostProcessBenchmarkVS(const ShaderMetaType::CompiledShaderInitializerType& Initializer):
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FGlobalShader(Initializer)
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{
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}
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/** Serializer */
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virtual bool Serialize(FArchive& Ar)
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{
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bool bShaderHasOutdatedParameters = FGlobalShader::Serialize(Ar);
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return bShaderHasOutdatedParameters;
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}
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void SetParameters(FRHICommandList& RHICmdList, const FSceneView& View)
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{
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const FVertexShaderRHIParamRef ShaderRHI = GetVertexShader();
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FGlobalShader::SetParameters(RHICmdList, ShaderRHI, View);
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}
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};
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IMPLEMENT_SHADER_TYPE(,FPostProcessBenchmarkVS,TEXT("GPUBenchmark"),TEXT("MainBenchmarkVS"),SF_Vertex);
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template <uint32 Method>
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void RunBenchmarkShader(FRHICommandListImmediate& RHICmdList, const FSceneView& View, TRefCountPtr<IPooledRenderTarget>& Src, uint32 Count)
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{
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TShaderMapRef<FPostProcessBenchmarkVS> VertexShader(GetGlobalShaderMap());
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TShaderMapRef<FPostProcessBenchmarkPS<Method> > PixelShader(GetGlobalShaderMap());
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static FGlobalBoundShaderState BoundShaderState;
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SetGlobalBoundShaderState(RHICmdList, BoundShaderState, GFilterVertexDeclaration.VertexDeclarationRHI, *VertexShader, *PixelShader);
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PixelShader->SetParameters(RHICmdList, View, Src);
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VertexShader->SetParameters(RHICmdList, View);
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for(uint32 i = 0; i < Count; ++i)
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{
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DrawRectangle(
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RHICmdList,
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0, 0,
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GBenchmarkResolution, GBenchmarkResolution,
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0, 0,
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GBenchmarkResolution, GBenchmarkResolution,
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FIntPoint(GBenchmarkResolution, GBenchmarkResolution),
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FIntPoint(GBenchmarkResolution, GBenchmarkResolution),
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*VertexShader,
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EDRF_Default);
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}
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}
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void RunBenchmarkShader(FRHICommandListImmediate& RHICmdList, const FSceneView& View, uint32 MethodId, TRefCountPtr<IPooledRenderTarget>& Src, uint32 Count)
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{
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SCOPED_DRAW_EVENTF(Benchmark, DEC_SCENE_ITEMS, TEXT("Benchmark Method:%d"), MethodId);
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switch(MethodId)
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{
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case 0: RunBenchmarkShader<0>(RHICmdList, View, Src, Count); return;
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case 1: RunBenchmarkShader<1>(RHICmdList, View, Src, Count); return;
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case 2: RunBenchmarkShader<2>(RHICmdList, View, Src, Count); return;
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case 3: RunBenchmarkShader<3>(RHICmdList, View, Src, Count); return;
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case 4: RunBenchmarkShader<4>(RHICmdList, View, Src, Count); return;
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default:
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check(0);
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}
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}
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// Many Benchmark timings stored in an array to allow to extract a good value dropping outliers
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// We need to get rid of the bad samples.
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class FTimingSeries
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{
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public:
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// @param ArraySize
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void Init(uint32 ArraySize)
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{
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check(ArraySize > 0);
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TimingValues.AddZeroed(ArraySize);
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}
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//
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void SetEntry(uint32 Index, float TimingValue)
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{
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check(Index < (uint32)TimingValues.Num());
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TimingValues[Index] = TimingValue;
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}
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//
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float GetEntry(uint32 Index) const
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{
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check(Index < (uint32)TimingValues.Num());
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return TimingValues[Index];
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}
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// @param OutConfidence
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float ComputeValue(float& OutConfidence) const
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{
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float Ret = 0.0f;
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TArray<float> SortedValues;
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{
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// a lot of values in the beginning are wrong, we cut off some part (1/4 of the samples area)
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uint32 StartIndex = TimingValues.Num() / 3;
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for(uint32 Index = StartIndex; Index < (uint32)TimingValues.Num(); ++Index)
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{
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SortedValues.Add(TimingValues[Index]);
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}
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SortedValues.Sort();
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}
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OutConfidence = 0.0f;
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uint32 Passes = 10;
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// slow but simple
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for(uint32 Pass = 0; Pass < Passes; ++Pass)
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{
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// 0..1, 0 not included
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float Alpha = (Pass + 1) / (float)Passes;
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int32 MidIndex = SortedValues.Num() / 2;
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int32 FromIndex = (int32)FMath::Lerp(MidIndex, 0, Alpha);
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int32 ToIndex = (int32)FMath::Lerp(MidIndex, SortedValues.Num(), Alpha);
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float Delta = 0.0f;
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float Confidence = 0.0f;
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float TimingValue = ComputeTimingFromSortedRange(FromIndex, ToIndex, SortedValues, Delta, Confidence);
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// aim for 5% delta and some samples
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if(Pass > 0 && Delta > TimingValue * 0.5f)
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{
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// it gets worse, take the best one we had so far
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break;
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}
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OutConfidence = Confidence;
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Ret = TimingValue;
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}
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return Ret;
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}
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private:
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// @param FromIndex within SortedValues
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// @param ToIndex within SortedValues
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// @param OutDelta +/-
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// @param OutConfidence 0..100 0=not at all, 100=fully, meaning how many samples are considered useful
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// @return TimingValue, smaller is better
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static float ComputeTimingFromSortedRange(int32 FromIndex, int32 ToIndex, const TArray<float>& SortedValues, float& OutDelta, float& OutConfidence)
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{
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float ValidSum = 0;
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uint32 ValidCount = 0;
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float Min = FLT_MAX;
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float Max = -FLT_MAX;
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{
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for(int32 Index = FromIndex; Index < ToIndex; ++Index)
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{
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float Value = SortedValues[Index];
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Min = FMath::Min(Min, Value);
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Max = FMath::Max(Max, Value);
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ValidSum += Value;
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++ValidCount;
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}
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}
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if(ValidCount)
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{
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OutDelta = (Max - Min) * 0.5f;
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OutConfidence = 100.0f * ValidCount / (float)SortedValues.Num();
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return ValidSum / ValidCount;
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}
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else
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{
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OutDelta = 0.0f;
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OutConfidence = 0.0f;
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return 0.0f;
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}
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}
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TArray<float> TimingValues;
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};
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#if !UE_BUILD_SHIPPING
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// for debugging only
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class FBenchmarkGraph
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{
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public:
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FBenchmarkGraph(uint32 InWidth, uint32 InHeight, const TCHAR* InFilePath)
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: FilePath(InFilePath)
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, Height(InHeight)
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, Width(InWidth)
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{
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Data.AddZeroed(Width * Height);
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}
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// @param x 0..Width-1
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// @param y 0..Height-1
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void DrawPixel(int32 X, int32 Y, FColor Color = FColor::White)
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{
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if((uint32)X < Width && (uint32)Y < Height)
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{
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Data[X + Y * Width] = Color;
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}
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}
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// @param x 0..Width-1
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// @param Value 0..1
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void DrawBar(int32 X, float Value)
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{
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Value = FMath::Clamp(Value, 0.0f, 1.0f);
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uint32 StartY = (uint32)((1.0f - Value) * Height);
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for(uint32 Y = StartY; Y < Height; ++Y)
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{
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bool bBetterThanReference = Y < (Height / 2);
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// better than reference system: green, otherwise red
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DrawPixel(X, Y, bBetterThanReference ? FColor::Green : FColor::Red);
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}
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}
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void Save() const
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{
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FFileHelper::CreateBitmap(*FilePath, Width, Height, Data.GetData());
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}
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private:
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TArray<FColor> Data;
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FString FilePath;
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uint32 Height;
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uint32 Width;
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};
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#endif
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void RendererGPUBenchmark(FRHICommandListImmediate& RHICmdList, FSynthBenchmarkResults& InOut, const FSceneView& View, uint32 WorkScale, bool bDebugOut)
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{
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check(IsInRenderingThread());
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// two RT to ping pong so we force the GPU to flush it's pipeline
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TRefCountPtr<IPooledRenderTarget> RTItems[3];
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{
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FPooledRenderTargetDesc Desc(FPooledRenderTargetDesc::Create2DDesc(FIntPoint(GBenchmarkResolution, GBenchmarkResolution), PF_B8G8R8A8, TexCreate_None, TexCreate_RenderTargetable | TexCreate_ShaderResource, false));
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GRenderTargetPool.FindFreeElement(Desc, RTItems[0], TEXT("Benchmark0"));
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GRenderTargetPool.FindFreeElement(Desc, RTItems[1], TEXT("Benchmark1"));
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Desc.Extent = FIntPoint(1, 1);
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Desc.Flags = TexCreate_CPUReadback; // needs TexCreate_ResolveTargetable?
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Desc.TargetableFlags = TexCreate_None;
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GRenderTargetPool.FindFreeElement(Desc, RTItems[2], TEXT("BenchmarkReadback"));
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}
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// set the state
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RHICmdList.SetBlendState(TStaticBlendState<>::GetRHI());
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RHICmdList.SetRasterizerState(TStaticRasterizerState<>::GetRHI());
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RHICmdList.SetDepthStencilState(TStaticDepthStencilState<false,CF_Always>::GetRHI());
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{
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// larger number means more accuracy but slower, some slower GPUs might timeout with a number to large
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const uint32 IterationCount = 70;
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const uint32 MethodCount = ARRAY_COUNT(InOut.GPUStats);
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// 0 / 1
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uint32 DestRTIndex = 0;
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const uint32 TimerSampleCount = IterationCount * MethodCount + 1;
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static FRenderQueryRHIRef TimerQueries[TimerSampleCount];
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static uint32 PassCount[IterationCount];
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for(uint32 i = 0; i < TimerSampleCount; ++i)
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{
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TimerQueries[i] = GTimerQueryPool.AllocateQuery();
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}
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if(!TimerQueries[0])
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{
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UE_LOG(LogSynthBenchmark, Warning, TEXT("GPU driver does not support timer queries."));
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}
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// TimingValues are in Seconds per GPixel
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FTimingSeries TimingSeries[MethodCount];
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for(uint32 MethodIterator = 0; MethodIterator < MethodCount; ++MethodIterator)
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{
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TimingSeries[MethodIterator].Init(IterationCount);
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}
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check(MethodCount == 5);
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InOut.GPUStats[0] = FSynthBenchmarkStat(TEXT("ALUHeavyNoise"), 1.0f / 4.601f, TEXT("s/GigaPix"));
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InOut.GPUStats[1] = FSynthBenchmarkStat(TEXT("TexHeavy"), 1.0f / 7.447f, TEXT("s/GigaPix"));
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InOut.GPUStats[2] = FSynthBenchmarkStat(TEXT("DepTexHeavy"), 1.0f / 3.847f, TEXT("s/GigaPix"));
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InOut.GPUStats[3] = FSynthBenchmarkStat(TEXT("FillOnly"), 1.0f / 25.463f, TEXT("s/GigaPix"));
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InOut.GPUStats[4] = FSynthBenchmarkStat(TEXT("Bandwidth"), 1.0f / 1.072f, TEXT("s/GigaPix"));
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// e.g. on NV670: Method3 (mostly fill rate )-> 26GP/s (seems realistic)
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// reference: http://en.wikipedia.org/wiki/Comparison_of_Nvidia_graphics_processing_units theoretical: 29.3G/s
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RHICmdList.EndRenderQuery(TimerQueries[0]);
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// multiple iterations to see how trust able the values are
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for(uint32 Iteration = 0; Iteration < IterationCount; ++Iteration)
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{
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for(uint32 MethodIterator = 0; MethodIterator < MethodCount; ++MethodIterator)
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{
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// alternate between forward and backward (should give the same number)
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// uint32 MethodId = (Iteration % 2) ? MethodIterator : (MethodCount - 1 - MethodIterator);
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uint32 MethodId = MethodIterator;
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uint32 QueryIndex = 1 + Iteration * MethodCount + MethodId;
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// 0 / 1
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const uint32 SrcRTIndex = 1 - DestRTIndex;
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GRenderTargetPool.VisualizeTexture.SetCheckPoint(RHICmdList, RTItems[DestRTIndex]);
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SetRenderTarget(RHICmdList, RTItems[DestRTIndex]->GetRenderTargetItem().TargetableTexture, FTextureRHIRef());
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// decide how much work we do in this pass
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PassCount[Iteration] = (Iteration / 10 + 1) * WorkScale;
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RunBenchmarkShader(RHICmdList, View, MethodId, RTItems[SrcRTIndex], PassCount[Iteration]);
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RHICmdList.CopyToResolveTarget(RTItems[DestRTIndex]->GetRenderTargetItem().TargetableTexture, RTItems[DestRTIndex]->GetRenderTargetItem().ShaderResourceTexture, false, FResolveParams());
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/*if(bGPUCPUSync)
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{
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// more consistent timing but strangely much faster to the level that is unrealistic
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FResolveParams Param;
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Param.Rect = FResolveRect(0, 0, 1, 1);
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RHICmdList.CopyToResolveTarget(
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RTItems[DestRTIndex]->GetRenderTargetItem().TargetableTexture,
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RTItems[2]->GetRenderTargetItem().ShaderResourceTexture,
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false,
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Param);
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void* Data = 0;
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int Width = 0;
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int Height = 0;
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RHIMapStagingSurface(RTItems[2]->GetRenderTargetItem().ShaderResourceTexture, Data, Width, Height);
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RHIUnmapStagingSurface(RTItems[2]->GetRenderTargetItem().ShaderResourceTexture);
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}*/
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RHICmdList.EndRenderQuery(TimerQueries[QueryIndex]);
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// ping pong
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DestRTIndex = 1 - DestRTIndex;
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}
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}
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{
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uint64 OldAbsTime = 0;
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RHICmdList.GetRenderQueryResult(TimerQueries[0], OldAbsTime, true);
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GTimerQueryPool.ReleaseQuery(RHICmdList, TimerQueries[0]);
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#if !UE_BUILD_SHIPPING
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FBenchmarkGraph BenchmarkGraph(IterationCount, IterationCount, *(FPaths::ScreenShotDir() + TEXT("GPUSynthBenchmarkGraph.bmp")));
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#endif
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for(uint32 Iteration = 0; Iteration < IterationCount; ++Iteration)
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{
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uint32 Results[MethodCount];
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for(uint32 MethodId = 0; MethodId < MethodCount; ++MethodId)
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{
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uint32 QueryIndex = 1 + Iteration * MethodCount + MethodId;
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uint64 AbsTime;
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RHICmdList.GetRenderQueryResult(TimerQueries[QueryIndex], AbsTime, true);
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GTimerQueryPool.ReleaseQuery(RHICmdList, TimerQueries[QueryIndex]);
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Results[MethodId] = AbsTime - OldAbsTime;
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OldAbsTime = AbsTime;
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}
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double SamplesInGPix = PassCount[Iteration] * GBenchmarkResolution * GBenchmarkResolution / 1000000000.0;
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for(uint32 MethodId = 0; MethodId < MethodCount; ++MethodId)
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{
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double TimeInSec = Results[MethodId] / 1000000.0;
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double TimingValue = TimeInSec / SamplesInGPix;
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// TimingValue in Seconds per GPixel
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TimingSeries[MethodId].SetEntry(Iteration, (float)TimingValue);
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}
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#if !UE_BUILD_SHIPPING
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{
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// This is for debugging and we don't want to change the output but we still use "InOut".
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// That shouldn't hurt, as we override the values after that anyway.
|
|
|
|
for(uint32 MethodId = 0; MethodId < MethodCount; ++MethodId)
|
|
{
|
|
InOut.GPUStats[MethodId].SetMeasuredTime(TimingSeries[MethodId].GetEntry(Iteration));
|
|
}
|
|
|
|
float LocalGPUIndex = InOut.ComputeGPUPerfIndex();
|
|
|
|
// * 0.01 to get it in 0..1 range
|
|
// * 0.5f to have 100 is the middle
|
|
BenchmarkGraph.DrawBar(Iteration, LocalGPUIndex * 0.01f * 0.5f);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
for(uint32 MethodId = 0; MethodId < MethodCount; ++MethodId)
|
|
{
|
|
float Confidence = 0.0f;
|
|
|
|
float TimingValue = TimingSeries[MethodId].ComputeValue(Confidence);
|
|
|
|
if(Confidence > 0)
|
|
{
|
|
InOut.GPUStats[MethodId].SetMeasuredTime(TimingValue, Confidence);
|
|
}
|
|
|
|
UE_LOG(LogSynthBenchmark, Display, TEXT(" ... %.3f GigaPix/s, Confidence=%.0f%% '%s'"),
|
|
1.0f / InOut.GPUStats[MethodId].GetMeasuredTime(), Confidence, InOut.GPUStats[MethodId].GetDesc());
|
|
}
|
|
|
|
UE_LOG(LogSynthBenchmark, Display, TEXT(""));
|
|
|
|
#if !UE_BUILD_SHIPPING
|
|
if(bDebugOut)
|
|
{
|
|
BenchmarkGraph.Save();
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
}
|