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62 lines
1.6 KiB
C++
62 lines
1.6 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#include "Systems/MovieScenePiecewiseEnumBlenderSystem.h"
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#include "EntitySystem/BuiltInComponentTypes.h"
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#include "EntitySystem/MovieSceneEntitySystemTask.h"
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#include "EntitySystem/MovieSceneEntitySystemLinker.h"
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#include "Systems/ByteChannelEvaluatorSystem.h"
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namespace UE
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{
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namespace MovieScene
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{
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/**
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* Custom blend result traits for enums:
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*
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* - We don't blend enums, unlike bytes, because we don't even know if the in-between values are valid
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* enumerations.
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* - Number of contributors doesn't matter. The last one wins.
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*/
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template<>
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struct TSimpleBlendResultTraits<uint8>
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{
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static void ZeroAccumulationBuffer(TArrayView<TSimpleBlendResult<uint8>> Buffer)
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{
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FMemory::Memzero(Buffer.GetData(), sizeof(TSimpleBlendResult<uint8>) * Buffer.Num());
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}
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static void AccumulateResult(TSimpleBlendResult<uint8>& InOutValue, uint8 Contributor)
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{
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InOutValue.Value = Contributor;
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++InOutValue.NumContributors;
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}
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static uint8 BlendResult(const TSimpleBlendResult<uint8>& InResult)
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{
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return InResult.Value;
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}
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};
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} // namespace MovieScene
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} // namespace UE
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UMovieScenePiecewiseEnumBlenderSystem::UMovieScenePiecewiseEnumBlenderSystem(const FObjectInitializer& ObjInit)
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: Super(ObjInit)
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{
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Impl.Setup(
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this,
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UE::MovieScene::FBuiltInComponentTypes::Get()->ByteResult,
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UByteChannelEvaluatorSystem::StaticClass());
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}
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void UMovieScenePiecewiseEnumBlenderSystem::OnRun(FSystemTaskPrerequisites& InPrerequisites, FSystemSubsequentTasks& Subsequents)
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{
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using namespace UE::MovieScene;
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CompactBlendChannels();
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Impl.Run(Linker, AllocatedBlendChannels, InPrerequisites, Subsequents);
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}
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