UnrealEngineUWP/Engine/Plugins/Runtime/Metasound/Source/MetasoundFrontend/Public/MetasoundSendNode.h

// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once

#include "CoreMinimal.h"
#include "MetasoundBuilderInterface.h"
#include "MetasoundNode.h"
#include "MetasoundNodeInterface.h"
#include "MetasoundOperatorInterface.h"
#include "MetasoundDataReference.h"
#include "MetasoundExecutableOperator.h"
#include "MetasoundRouter.h"

#include <type_traits>

#define LOCTEXT_NAMESPACE "MetasoundFrontend"


namespace Metasound
{
	template<typename TDataType>
	class TSendNode : public FNode
	{
	public:
		static const FString& GetAddressInputName()
		{
			static const FString InputName = TEXT("Address");
			return InputName;
		}

		static const FString& GetSendInputName()
		{
			static const FString& SendInput = GetMetasoundDataTypeString<TDataType>();
			return SendInput;
		}

		static FVertexInterface DeclareVertexInterface()
		{
			return FVertexInterface(
				FInputVertexInterface(
					TInputDataVertexModel<FSendAddress>(GetAddressInputName(), FText::GetEmpty()),
					TInputDataVertexModel<TDataType>(GetSendInputName(), FText::GetEmpty())
				),
				FOutputVertexInterface(
				)
			);
		}

		static const FNodeClassMetadata& GetNodeInfo()
		{
			auto InitNodeInfo = []() -> FNodeClassMetadata
			{
				const FString& InputName = GetSendInputName();
				FNodeClassMetadata Info;

				Info.ClassName = {TEXT("Send"), GetMetasoundDataTypeName<TDataType>(), TEXT("")};
				Info.MajorVersion = 1;
				Info.MinorVersion = 0;
				Info.DisplayName = FText::Format(LOCTEXT("Metasound_SendNodeDisplayNameFormat", "Send {0}"), FText::FromName(GetMetasoundDataTypeName<TDataType>()));
				Info.Description = LOCTEXT("Metasound_SendNodeDescription", "Sends data from a send node with the same name.");
				Info.Author = PluginAuthor;
				Info.PromptIfMissing = PluginNodeMissingPrompt;
				Info.DefaultInterface = DeclareVertexInterface();
				Info.CategoryHierarchy = { LOCTEXT("Metasound_TransmissionNodeCategory", "Transmission") };
				Info.Keywords = { "Send", GetMetasoundDataTypeName<TDataType>()};

				return Info;
			};

			static const FNodeClassMetadata Info = InitNodeInfo();

			return Info;
		}


	private:
		class TSendOperator : public TExecutableOperator<TSendOperator>
		{
			public:

				TSendOperator(TDataReadReference<TDataType> InInputData, TDataReadReference<FSendAddress> InSendAddress, const FOperatorSettings& InOperatorSettings)
					: InputData(InInputData)
					, SendAddress(InSendAddress)
					, CachedSendAddress(*InSendAddress)
					, CachedSenderParams({InOperatorSettings, 0.0f})
					, Sender(FDataTransmissionCenter::Get().RegisterNewSend<TDataType>(CachedSendAddress, CachedSenderParams))
				{
				}

				virtual ~TSendOperator() {}

				virtual FDataReferenceCollection GetInputs() const override
				{
					FDataReferenceCollection Inputs;
					Inputs.AddDataReadReference<FSendAddress>(GetAddressInputName(), SendAddress);
					Inputs.AddDataReadReference<TDataType>(GetSendInputName(), TDataReadReference<TDataType>(InputData));
					return Inputs;
				}

				virtual FDataReferenceCollection GetOutputs() const override
				{
					return {};
				}

				void Execute()
				{
					if (SendAddress->ChannelName != CachedSendAddress.ChannelName)
					{
						CachedSendAddress = *SendAddress;
						Sender = FDataTransmissionCenter::Get().RegisterNewSend<TDataType>(CachedSendAddress, CachedSenderParams);
						check(Sender.IsValid());
					}

					Sender->Push(*InputData);
				}

			private:
				TDataReadReference<TDataType> InputData;
				TDataReadReference<FSendAddress> SendAddress;
				FSendAddress CachedSendAddress;
				FSenderInitParams CachedSenderParams;

				TSenderPtr<TDataType> Sender;
		};

		class FSendOperatorFactory : public IOperatorFactory
		{
			public:
				FSendOperatorFactory() = default;

				virtual TUniquePtr<IOperator> CreateOperator(const FCreateOperatorParams& InParams, FBuildErrorArray& OutErrors) override
				{
					return MakeUnique<TSendOperator>(InParams.InputDataReferences.GetDataReadReference<TDataType>(GetSendInputName()),
						InParams.InputDataReferences.GetDataReadReference<FSendAddress>(GetAddressInputName()),
						InParams.OperatorSettings
						);
				}
		};

		public:

			TSendNode(const FNodeInitData& InInitData)
				: FNode(InInitData.InstanceName, InInitData.InstanceID, GetNodeInfo())
				, Interface(DeclareVertexInterface())
				, Factory(MakeOperatorFactoryRef<FSendOperatorFactory>())
			{
			}

			virtual ~TSendNode() = default;

			virtual const FVertexInterface& GetVertexInterface() const override
			{
				return Interface;
			}

			virtual bool SetVertexInterface(const FVertexInterface& InInterface) override
			{
				return Interface == InInterface;
			}

			virtual bool IsVertexInterfaceSupported(const FVertexInterface& InInterface) const override
			{
				return Interface == InInterface;
			}

			virtual FOperatorFactorySharedRef GetDefaultOperatorFactory() const override
			{
				return Factory;
			}

		private:
			FVertexInterface Interface;
			FOperatorFactorySharedRef Factory;
	};
}
#undef LOCTEXT_NAMESPACE