UnrealEngineUWP/Engine/Source/Editor/AnimGraph/Private/AnimGraphNode_AssetPlayerBase.cpp

// Copyright Epic Games, Inc. All Rights Reserved.

#include "AnimGraphNode_AssetPlayerBase.h"
#include "EdGraphSchema_K2.h"
#include "Animation/AnimComposite.h"
#include "Animation/BlendSpaceBase.h"
#include "Animation/AimOffsetBlendSpace.h"
#include "Animation/AimOffsetBlendSpace1D.h"
#include "AnimGraphNode_SequencePlayer.h"
#include "AnimGraphNode_SequenceEvaluator.h"
#include "AnimGraphNode_RotationOffsetBlendSpace.h"
#include "AnimGraphNode_BlendSpacePlayer.h"
#include "AnimGraphNode_BlendSpaceEvaluator.h"
#include "Animation/PoseAsset.h"
#include "AnimGraphNode_PoseBlendNode.h"
#include "AnimGraphNode_PoseByName.h"
#include "AnimGraphNode_PoseDriver.h"
#include "UObject/UObjectIterator.h"
#include "Animation/AnimLayerInterface.h"
#include "IAnimBlueprintCompilerHandlerCollection.h"
#include "AnimBlueprintCompilerHandler_Base.h"
#include "IAnimBlueprintGeneratedClassCompiledData.h"
#include "IAnimBlueprintCompilationContext.h"

void UAnimGraphNode_AssetPlayerBase::PinConnectionListChanged(UEdGraphPin* Pin)
{
	Super::PinConnectionListChanged(Pin);

	if (Pin->PinType.PinCategory == UEdGraphSchema_K2::PC_Object)
	{
		// recache visualization now an asset pin's connection is changed
		if (const UEdGraphSchema* Schema = GetSchema())
		{
			Schema->ForceVisualizationCacheClear();
		}
	}
}

void UAnimGraphNode_AssetPlayerBase::PinDefaultValueChanged(UEdGraphPin* Pin)
{
	Super::PinDefaultValueChanged(Pin);

	if (Pin->PinType.PinCategory == UEdGraphSchema_K2::PC_Object)
	{
		// recache visualization now an asset pin's default value has changed
		if (const UEdGraphSchema* Schema = GetSchema())
		{
			Schema->ForceVisualizationCacheClear();
		}
	}
}

void UAnimGraphNode_AssetPlayerBase::OnProcessDuringCompilation(IAnimBlueprintCompilationContext& InCompilationContext, IAnimBlueprintGeneratedClassCompiledData& OutCompiledData)
{
	UBlueprint* Blueprint = GetBlueprint();

	// Process Asset Player nodes to, if necessary cache off their node index for retrieval at runtime (used for evaluating Automatic Rule Transitions when using Layer nodes)
	auto ProcessGraph = [this, &OutCompiledData](UEdGraph* Graph)
	{
		// Make sure we do not process the default AnimGraph
		static const FName DefaultAnimGraphName("AnimGraph");
		if (Graph->GetFName() != DefaultAnimGraphName)
		{
			FString GraphName = Graph->GetName();
			// Also make sure we do not process any empty stub graphs
			if (!GraphName.Contains(ANIM_FUNC_DECORATOR))
			{
				if (Graph->Nodes.ContainsByPredicate([this, &OutCompiledData](UEdGraphNode* Node) { return Node->NodeGuid == NodeGuid; }))
				{
					if (int32* IndexPtr = OutCompiledData.GetAnimBlueprintDebugData().NodeGuidToIndexMap.Find(NodeGuid))
					{
						FGraphAssetPlayerInformation& Info = OutCompiledData.GetGraphAssetPlayerInformation().FindOrAdd(FName(*GraphName));
						Info.PlayerNodeIndices.AddUnique(*IndexPtr);
					}
				}
			}
		}
	};

	// Check for any definition of a layer graph
	for (UEdGraph* Graph : Blueprint->FunctionGraphs)
	{
		ProcessGraph(Graph);
	}

	// Check for any implemented AnimLayer interface graphs
	for (FBPInterfaceDescription& InterfaceDesc : Blueprint->ImplementedInterfaces)
	{
		// Only process Anim Layer interfaces
		if (InterfaceDesc.Interface->IsChildOf<UAnimLayerInterface>())
		{
			for (UEdGraph* Graph : InterfaceDesc.Graphs)
			{
				ProcessGraph(Graph);
			}
		}
	}
}

UClass* GetNodeClassForAsset(const UClass* AssetClass)
{
	UClass* NodeClass = nullptr;

	// Iterate over all classes..
	for (TObjectIterator<UClass> ClassIt; ClassIt; ++ClassIt)
	{
		UClass *Class = *ClassIt;
		// Look for AnimGraphNode classes
		if (Class->IsChildOf(UAnimGraphNode_Base::StaticClass()))
		{
			// See if this node is the 'primary handler' for this asset type
			const UAnimGraphNode_Base* NodeCDO = Class->GetDefaultObject<UAnimGraphNode_Base>();
			if (NodeCDO->SupportsAssetClass(AssetClass) == EAnimAssetHandlerType::PrimaryHandler)
			{
				NodeClass = Class;
				break;
			}
		}
	}

	return NodeClass;
}

bool SupportNodeClassForAsset(const UClass* AssetClass, UClass* NodeClass)
{
	// Get node CDO
	const UAnimGraphNode_Base* NodeCDO = NodeClass->GetDefaultObject<UAnimGraphNode_Base>();
	// See if this node supports this asset type (primary or not)
	return (NodeCDO->SupportsAssetClass(AssetClass) != EAnimAssetHandlerType::NotSupported);
}