Add initial support for Deploying Windows games to the SteamDeck through .ini entries

#jira UE-145123
[REVIEW] [at]Josh.Adams
#rb Josh.Adams, David.Harvey
#preflight 6230b118f33750e39249d834

#ROBOMERGE-OWNER: brandon.schaefer
#ROBOMERGE-AUTHOR: brandon.schaefer
#ROBOMERGE-SOURCE: CL 19389680 in //UE5/Release-5.0/... via CL 19391874
#ROBOMERGE-BOT: UE5 (Release-Engine-Staging -> Main) (v926-19321884)

[CL 19402230 by brandon schaefer in ue5-main branch]

Engine/Source/Developer/Windows/WindowsTargetPlatform/Private/GenericWindowsTargetPlatform.h

@@ -9,6 +9,7 @@
 #include "LocalPcTargetDevice.h"
 #endif
 #include "Serialization/MemoryLayout.h"
+#include "SteamDeckDevice.h"
 
 #if WITH_ENGINE
 	#include "Sound/SoundWave.h"
@@ -45,6 +46,9 @@ public:
 #if PLATFORM_WINDOWS
 		// only add local device if actually running on Windows
 		LocalDevice = MakeShareable(new TTargetDevice(*this));
+
+		// Check if we have any SteamDeck devices around
+		SteamDevices = FSteamDeckDevice::DiscoverDevices(*this);
 #endif
 
 	#if WITH_ENGINE
@@ -91,6 +95,7 @@ public:
 		bRequiresEncodedHDRReflectionCaptures =	TargetedShaderFormats.Contains(NAME_SF_VULKAN_ES31)
 												|| TargetedShaderFormats.Contains(NAME_OPENGL_150_ES3_1)
 												|| TargetedShaderFormats.Contains(NAME_PCD3D_ES3_1);
+
 	#endif
 	}
 
@@ -107,6 +112,14 @@ public:
 		{
 			OutDevices.Add(LocalDevice);
 		}
+
+		for (const ITargetDevicePtr& SteamDeck : SteamDevices)
+		{
+			if (SteamDeck.IsValid())
+			{
+				OutDevices.Add(SteamDeck);
+			}
+		}
 	}
 
 	virtual bool GenerateStreamingInstallManifest(const TMultiMap<FString, int32>& PakchunkMap, const TSet<int32>& PakchunkIndicesInUse) const override
@@ -131,6 +144,14 @@ public:
 			return LocalDevice;
 		}
 
+		for (const ITargetDevicePtr& SteamDeck : SteamDevices)
+		{
+			if (SteamDeck.IsValid() && DeviceId == SteamDeck->GetId())
+			{
+				return SteamDeck;
+			}
+		}
+
 		return nullptr;
 	}
 
@@ -362,6 +383,8 @@ private:
 	// Holds the local device.
 	ITargetDevicePtr LocalDevice;
 
+	TArray<ITargetDevicePtr> SteamDevices;
+
 #if WITH_ENGINE
 	// Holds the texture LOD settings.
 	const UTextureLODSettings* TextureLODSettings;

Engine/Source/Developer/Windows/WindowsTargetPlatform/Private/SteamDeckDevice.h

@@ -0,0 +1,90 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Common/TargetPlatformBase.h"
+#include "Misc/ConfigCacheIni.h"
+#if PLATFORM_WINDOWS
+#include "LocalPcTargetDevice.h"
+#endif
+#include "Serialization/MemoryLayout.h"
+
+// Extend SteamDevice from LocalPcDevice as we are leveraging the Windows Device for Steam Deck when building
+// for the Win64 platform. As SteamDeck consumes the exact same build it would for a normal Win64 device
+#if PLATFORM_WINDOWS
+class FSteamDeckDevice : public TLocalPcTargetDevice<true>
+{
+public:
+	FSteamDeckDevice(FString InIpAddr, FString InDeviceName, FString InUserName, const ITargetPlatform& InTargetPlatform)
+		: TLocalPcTargetDevice<true>(InTargetPlatform)
+		, IpAddr(InIpAddr)
+		, DeviceName(InDeviceName)
+		, UserName(InUserName)
+	{
+	}
+
+	virtual FString GetName() const override
+	{
+		return DeviceName;
+	}
+
+	virtual FTargetDeviceId GetId() const override
+	{
+		return FTargetDeviceId(TargetPlatform.PlatformName(), IpAddr);
+	}
+
+	virtual FString GetOperatingSystemName() override
+	{
+		return TEXT("SteamOS");
+	}
+
+	virtual bool GetUserCredentials(FString& OutUserName, FString& OutUserPassword) override
+	{
+		OutUserName = UserName;
+
+		// No need for a password, as it will use an rsa key that is part of the SteamOS Devkit Client
+		OutUserPassword = FString();
+
+		return true;
+	}
+
+	static TArray<ITargetDevicePtr> DiscoverDevices(const ITargetPlatform& GenericWindowsTP)
+	{
+		TArray<FString> EngineIniSteamDeckDevices;
+
+		// Expected ini format: +SteamDeckDevice=(IpAddr=10.1.33.19,Name=MySteamDeck,UserName=deck)
+		GConfig->GetArray(TEXT("/Script/WindowsTargetPlatform.WindowsTargetSettings"), TEXT("SteamDeckDevice"), EngineIniSteamDeckDevices, GEngineIni);
+
+		TArray<ITargetDevicePtr> SteamDevices;
+		for (const FString& Device : EngineIniSteamDeckDevices)
+		{
+			FString IpAddr;
+			FString Name;
+			FString UserName;
+			if (!FParse::Value(*Device, TEXT("IpAddr="), IpAddr))
+			{
+				continue;
+			}
+			// Name is not required, if not set use the IpAddr. This is what is displayed in the Editor
+			if (!FParse::Value(*Device, TEXT("Name="), Name))
+			{
+				Name = IpAddr;
+			}
+			if (!FParse::Value(*Device, TEXT("UserName="), UserName))
+			{
+				continue;
+			}
+
+			SteamDevices.Add(MakeShareable(new FSteamDeckDevice(IpAddr, Name, UserName, GenericWindowsTP)));
+		}
+
+		return SteamDevices;
+	}
+
+private:
+	FString IpAddr;
+	FString DeviceName;
+	FString UserName;
+};
+#endif // PLATFORM_WINDOWS