Adds Nintendo DS AirPlay settings to customize how games appear on TV

* Top Screen Only = Shows just the top screen on TV
* Layout Horizontally = Places screens side-by-side on TV (instead of stacked vertically)

Cores/DeltaCore

@@ -1 +1 @@
-Subproject commit 4b5084c75149dc0fc7b4abb4e6ab4f41df025ecd
+Subproject commit 3ce43f3103c637dfdb27f85fc0d0041c8a37292b

Delta.xcodeproj/project.pbxproj

@@ -196,6 +196,8 @@
 		D5A9C00329DDED6D00A8D610 /* ExperimentalFeaturesView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D5A9C00229DDED6D00A8D610 /* ExperimentalFeaturesView.swift */; };
 		D5A9C01D29DE058C00A8D610 /* VariableFastForward.swift in Sources */ = {isa = PBXBuildFile; fileRef = D5A9C01C29DE058C00A8D610 /* VariableFastForward.swift */; };
 		D5AAF27729884F8600F21ACF /* CheatDevice.swift in Sources */ = {isa = PBXBuildFile; fileRef = D5AAF27629884F8600F21ACF /* CheatDevice.swift */; };
+		D5ADD12229F33FBF00CE0560 /* Features.swift in Sources */ = {isa = PBXBuildFile; fileRef = D5ADD12129F33FBF00CE0560 /* Features.swift */; };
+		D5D78AE529F9BC3700E064F0 /* DSAirPlay.swift in Sources */ = {isa = PBXBuildFile; fileRef = D5D78AE429F9BC3700E064F0 /* DSAirPlay.swift */; };
 		D5D797E6298D946200738869 /* Contributor.swift in Sources */ = {isa = PBXBuildFile; fileRef = D5D797E5298D946200738869 /* Contributor.swift */; };
 		D5D797E9298DCC7300738869 /* cheatbase.zip in Resources */ = {isa = PBXBuildFile; fileRef = D5D797E7298DC9E200738869 /* cheatbase.zip */; };
 		D5D7C1F929E60EA500663793 /* UserDefaults+OptionValues.swift in Sources */ = {isa = PBXBuildFile; fileRef = D58F39C829E0A702008B4100 /* UserDefaults+OptionValues.swift */; };
@@ -453,6 +455,8 @@
 		D5A9C01929DDFBDD00A8D610 /* SettingsName.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SettingsName.swift; sourceTree = "<group>"; };
 		D5A9C01C29DE058C00A8D610 /* VariableFastForward.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = VariableFastForward.swift; sourceTree = "<group>"; };
 		D5AAF27629884F8600F21ACF /* CheatDevice.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CheatDevice.swift; sourceTree = "<group>"; };
+		D5ADD12129F33FBF00CE0560 /* Features.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Features.swift; sourceTree = "<group>"; };
+		D5D78AE429F9BC3700E064F0 /* DSAirPlay.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DSAirPlay.swift; sourceTree = "<group>"; };
 		D5D797E5298D946200738869 /* Contributor.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Contributor.swift; sourceTree = "<group>"; };
 		D5D797E7298DC9E200738869 /* cheatbase.zip */ = {isa = PBXFileReference; lastKnownFileType = archive.zip; path = cheatbase.zip; sourceTree = "<group>"; };
 		D5D7C1E629E5F90200663793 /* OptionValue.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = OptionValue.swift; sourceTree = "<group>"; };
@@ -845,6 +849,7 @@
 				BF11734E1DA32CEC00047DF8 /* Controllers */,
 				BF1DAD5B1D9F574900E752A7 /* Controller Skins */,
 				BF48F74C219A16C100BC2FC1 /* Syncing */,
+				D5D78AE329F9BC0200E064F0 /* Features */,
 				D5A9BFFF29DDECF500A8D610 /* Experimental Features */,
 				D5D797E4298D944C00738869 /* Contributors */,
 			);
@@ -1092,6 +1097,15 @@
 			path = "Experimental Features";
 			sourceTree = "<group>";
 		};
+		D5D78AE329F9BC0200E064F0 /* Features */ = {
+			isa = PBXGroup;
+			children = (
+				D5ADD12129F33FBF00CE0560 /* Features.swift */,
+				D5D78AE429F9BC3700E064F0 /* DSAirPlay.swift */,
+			);
+			path = Features;
+			sourceTree = "<group>";
+		};
 		D5D797E4298D944C00738869 /* Contributors */ = {
 			isa = PBXGroup;
 			children = (
@@ -1519,11 +1533,13 @@
 				D560BD8629EDC45600289847 /* ExternalDisplaySceneDelegate.swift in Sources */,
 				BFFC46201D59823500AF2CC6 /* InitialGamesStoryboardSegue.swift in Sources */,
 				BF15AF841F54B43B009B6AAB /* ActionInput.swift in Sources */,
+				D5D78AE529F9BC3700E064F0 /* DSAirPlay.swift in Sources */,
 				BF4828841F9027B600028B97 /* Delta.xcdatamodeld in Sources */,
 				BF5942951E09BD1A0051894B /* NSManagedObjectContext+Conveniences.swift in Sources */,
 				BFC3628021ADE2BA00EF2BE6 /* UIAlertController+Error.swift in Sources */,
 				BF353FF91C5D870B00C1184C /* MenuItem.swift in Sources */,
 				D5D797E6298D946200738869 /* Contributor.swift in Sources */,
+				D5ADD12229F33FBF00CE0560 /* Features.swift in Sources */,
 				BFDB3418219E4B1700595A62 /* SyncStatusViewController.swift in Sources */,
 				BF18B61F1E2985F900F70067 /* UIAlertController+Importing.swift in Sources */,
 				D586497229774ABD0081477E /* CheatBase.swift in Sources */,

Delta/Base.lproj/Settings.storyboard

@@ -1956,10 +1956,80 @@ Delta uses OpenVGDB to provide automatic artwork for imported games.</string>
                                     </tableViewCell>
                                 </cells>
                             </tableViewSection>
+                            <tableViewSection headerTitle="AirPlay" id="Bci-L3-OeH">
+                                <cells>
+                                    <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="none" indentationWidth="10" reuseIdentifier="SwitchCell" id="Jq5-oz-Tdi" customClass="SwitchTableViewCell">
+                                        <rect key="frame" x="0.0" y="291.5" width="375" height="44"/>
+                                        <autoresizingMask key="autoresizingMask"/>
+                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="Jq5-oz-Tdi" id="rg7-TQ-4w8">
+                                            <rect key="frame" x="0.0" y="0.0" width="375" height="44"/>
+                                            <autoresizingMask key="autoresizingMask"/>
+                                            <subviews>
+                                                <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Show Top Screen Only" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="leX-Hk-FtK">
+                                                    <rect key="frame" x="16" y="11.5" width="286" height="21"/>
+                                                    <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                                    <nil key="textColor"/>
+                                                    <nil key="highlightedColor"/>
+                                                </label>
+                                                <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" on="YES" translatesAutoresizingMaskIntoConstraints="NO" id="erK-Wq-1Lx">
+                                                    <rect key="frame" x="310" y="6.5" width="51" height="31"/>
+                                                    <color key="onTintColor" name="Purple"/>
+                                                    <connections>
+                                                        <action selector="toggleTopScreenOnly:" destination="OwL-4c-EEA" eventType="valueChanged" id="Muw-Xa-Wy1"/>
+                                                    </connections>
+                                                </switch>
+                                            </subviews>
+                                            <constraints>
+                                                <constraint firstItem="erK-Wq-1Lx" firstAttribute="leading" secondItem="leX-Hk-FtK" secondAttribute="trailing" constant="8" symbolic="YES" id="3bQ-fs-dhn"/>
+                                                <constraint firstItem="leX-Hk-FtK" firstAttribute="centerY" secondItem="rg7-TQ-4w8" secondAttribute="centerY" id="DdR-vJ-3hz"/>
+                                                <constraint firstAttribute="trailingMargin" secondItem="erK-Wq-1Lx" secondAttribute="trailing" id="Yn5-qu-rZ7"/>
+                                                <constraint firstItem="leX-Hk-FtK" firstAttribute="leading" secondItem="rg7-TQ-4w8" secondAttribute="leadingMargin" id="gaA-Aj-Y45"/>
+                                                <constraint firstItem="erK-Wq-1Lx" firstAttribute="centerY" secondItem="rg7-TQ-4w8" secondAttribute="centerY" id="tsz-wz-mVz"/>
+                                            </constraints>
+                                        </tableViewCellContentView>
+                                        <connections>
+                                            <outlet property="switchView" destination="erK-Wq-1Lx" id="55W-CO-LbT"/>
+                                        </connections>
+                                    </tableViewCell>
+                                    <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="none" indentationWidth="10" reuseIdentifier="SwitchCell" id="Wfb-f8-j84" customClass="SwitchTableViewCell">
+                                        <rect key="frame" x="0.0" y="335.5" width="375" height="44"/>
+                                        <autoresizingMask key="autoresizingMask"/>
+                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="Wfb-f8-j84" id="bVY-An-mBJ">
+                                            <rect key="frame" x="0.0" y="0.0" width="375" height="44"/>
+                                            <autoresizingMask key="autoresizingMask"/>
+                                            <subviews>
+                                                <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Arrange Screens Horizontally" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="agM-Sz-8Jc">
+                                                    <rect key="frame" x="16" y="11.5" width="286" height="21"/>
+                                                    <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                                    <nil key="textColor"/>
+                                                    <nil key="highlightedColor"/>
+                                                </label>
+                                                <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" on="YES" translatesAutoresizingMaskIntoConstraints="NO" id="F3O-5s-93H">
+                                                    <rect key="frame" x="310" y="6.5" width="51" height="31"/>
+                                                    <color key="onTintColor" name="Purple"/>
+                                                    <connections>
+                                                        <action selector="toggleLayoutHorizontally:" destination="OwL-4c-EEA" eventType="valueChanged" id="Wnh-tj-Z01"/>
+                                                    </connections>
+                                                </switch>
+                                            </subviews>
+                                            <constraints>
+                                                <constraint firstAttribute="trailingMargin" secondItem="F3O-5s-93H" secondAttribute="trailing" id="4A1-e1-ByX"/>
+                                                <constraint firstItem="F3O-5s-93H" firstAttribute="centerY" secondItem="bVY-An-mBJ" secondAttribute="centerY" id="Ede-Sv-5JJ"/>
+                                                <constraint firstItem="agM-Sz-8Jc" firstAttribute="leading" secondItem="bVY-An-mBJ" secondAttribute="leadingMargin" id="lcT-KV-Mes"/>
+                                                <constraint firstItem="agM-Sz-8Jc" firstAttribute="centerY" secondItem="bVY-An-mBJ" secondAttribute="centerY" id="oOf-ri-9Rb"/>
+                                                <constraint firstItem="F3O-5s-93H" firstAttribute="leading" secondItem="agM-Sz-8Jc" secondAttribute="trailing" constant="8" symbolic="YES" id="rXK-nP-M6x"/>
+                                            </constraints>
+                                        </tableViewCellContentView>
+                                        <connections>
+                                            <outlet property="switchView" destination="F3O-5s-93H" id="ZiQ-7p-Qb8"/>
+                                        </connections>
+                                    </tableViewCell>
+                                </cells>
+                            </tableViewSection>
                             <tableViewSection headerTitle="Performance" footerTitle="When enabled, Delta will automatically enable JIT when on the same WiFi network as AltServer." id="MyM-jI-qtY" userLabel="Performance">
                                 <cells>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="none" indentationWidth="10" reuseIdentifier="SwitchCell" id="uXJ-qB-E2e" customClass="SwitchTableViewCell">
-                                        <rect key="frame" x="0.0" y="284" width="375" height="44"/>
+                                        <rect key="frame" x="0.0" y="443" width="375" height="44"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="uXJ-qB-E2e" id="mkz-9w-FlW">
                                             <rect key="frame" x="0.0" y="0.0" width="375" height="44"/>
@@ -1997,7 +2067,7 @@ Delta uses OpenVGDB to provide automatic artwork for imported games.</string>
                             <tableViewSection headerTitle="DS BIOS Files" footerTitle="Delta requires these BIOS files in order to play Nintendo DS games. Tap one to import it from Files." id="ObZ-cl-5sV">
                                 <cells>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="gray" accessoryType="disclosureIndicator" indentationWidth="10" reuseIdentifier="Cell" textLabel="Bfp-iA-wWE" detailTextLabel="Xpe-sd-GRy" style="IBUITableViewCellStyleValue1" id="ian-1X-SOi">
-                                        <rect key="frame" x="0.0" y="408" width="375" height="44"/>
+                                        <rect key="frame" x="0.0" y="578.5" width="375" height="44"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="ian-1X-SOi" id="nE9-5Y-G2k">
                                             <rect key="frame" x="0.0" y="0.0" width="349.5" height="44"/>
@@ -2020,7 +2090,7 @@ Delta uses OpenVGDB to provide automatic artwork for imported games.</string>
                                         </tableViewCellContentView>
                                     </tableViewCell>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="gray" accessoryType="disclosureIndicator" indentationWidth="10" reuseIdentifier="Cell" textLabel="fgD-y0-55T" detailTextLabel="b8s-cx-IgW" style="IBUITableViewCellStyleValue1" id="dwT-0T-gFD">
-                                        <rect key="frame" x="0.0" y="452" width="375" height="44"/>
+                                        <rect key="frame" x="0.0" y="622.5" width="375" height="44"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="dwT-0T-gFD" id="KEg-18-WYZ">
                                             <rect key="frame" x="0.0" y="0.0" width="349.5" height="44"/>
@@ -2043,7 +2113,7 @@ Delta uses OpenVGDB to provide automatic artwork for imported games.</string>
                                         </tableViewCellContentView>
                                     </tableViewCell>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="gray" accessoryType="disclosureIndicator" indentationWidth="10" reuseIdentifier="Cell" textLabel="SIu-zD-qfE" detailTextLabel="CW8-h0-YST" style="IBUITableViewCellStyleValue1" id="Tll-tX-97T">
-                                        <rect key="frame" x="0.0" y="496" width="375" height="44"/>
+                                        <rect key="frame" x="0.0" y="666.5" width="375" height="44"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="Tll-tX-97T" id="4ca-AM-jBE">
                                             <rect key="frame" x="0.0" y="0.0" width="349.5" height="44"/>
@@ -2070,7 +2140,7 @@ Delta uses OpenVGDB to provide automatic artwork for imported games.</string>
                             <tableViewSection headerTitle="DSi BIOS Files" footerTitle="Delta requires these BIOS files in order to play Nintendo DSi games. Tap one to import it from Files." id="SAz-hG-O4G">
                                 <cells>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="gray" accessoryType="disclosureIndicator" indentationWidth="10" reuseIdentifier="Cell" textLabel="QKd-rm-101" detailTextLabel="pJb-OR-TGs" style="IBUITableViewCellStyleValue1" id="jwN-8n-xgM">
-                                        <rect key="frame" x="0.0" y="620" width="375" height="44"/>
+                                        <rect key="frame" x="0.0" y="802" width="375" height="44"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="jwN-8n-xgM" id="b29-V1-qt3">
                                             <rect key="frame" x="0.0" y="0.0" width="349.5" height="44"/>
@@ -2093,7 +2163,7 @@ Delta uses OpenVGDB to provide automatic artwork for imported games.</string>
                                         </tableViewCellContentView>
                                     </tableViewCell>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="gray" accessoryType="disclosureIndicator" indentationWidth="10" reuseIdentifier="Cell" textLabel="6OX-32-izR" detailTextLabel="2bc-8r-epB" style="IBUITableViewCellStyleValue1" id="3ka-mn-QqR">
-                                        <rect key="frame" x="0.0" y="664" width="375" height="44"/>
+                                        <rect key="frame" x="0.0" y="846" width="375" height="44"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="3ka-mn-QqR" id="4ya-QS-s5w">
                                             <rect key="frame" x="0.0" y="0.0" width="349.5" height="44"/>
@@ -2116,7 +2186,7 @@ Delta uses OpenVGDB to provide automatic artwork for imported games.</string>
                                         </tableViewCellContentView>
                                     </tableViewCell>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="gray" accessoryType="disclosureIndicator" indentationWidth="10" reuseIdentifier="Cell" textLabel="Czu-qN-Luq" detailTextLabel="eVw-7r-BEf" style="IBUITableViewCellStyleValue1" id="4FF-9a-jq2">
-                                        <rect key="frame" x="0.0" y="708" width="375" height="44"/>
+                                        <rect key="frame" x="0.0" y="890" width="375" height="44"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="4FF-9a-jq2" id="emb-d3-TgY">
                                             <rect key="frame" x="0.0" y="0.0" width="349.5" height="44"/>
@@ -2139,7 +2209,7 @@ Delta uses OpenVGDB to provide automatic artwork for imported games.</string>
                                         </tableViewCellContentView>
                                     </tableViewCell>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="gray" accessoryType="disclosureIndicator" indentationWidth="10" reuseIdentifier="Cell" textLabel="VWi-nu-uMv" detailTextLabel="8JD-uT-eoA" style="IBUITableViewCellStyleValue1" id="we3-0h-uKq">
-                                        <rect key="frame" x="0.0" y="752" width="375" height="44"/>
+                                        <rect key="frame" x="0.0" y="934" width="375" height="44"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="we3-0h-uKq" id="cG1-a2-Nez">
                                             <rect key="frame" x="0.0" y="0.0" width="349.5" height="44"/>
@@ -2166,7 +2236,7 @@ Delta uses OpenVGDB to provide automatic artwork for imported games.</string>
                             <tableViewSection headerTitle="" footerTitle="Changing cores may improve performance at the cost of additional features." id="hbM-mL-bIr">
                                 <cells>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="gray" indentationWidth="10" reuseIdentifier="ChangeCell" textLabel="Jmx-Jw-278" style="IBUITableViewCellStyleDefault" id="p1T-4d-fC3">
-                                        <rect key="frame" x="0.0" y="861.5" width="375" height="44"/>
+                                        <rect key="frame" x="0.0" y="1053.5" width="375" height="44"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="p1T-4d-fC3" id="3bs-Bp-nd4">
                                             <rect key="frame" x="0.0" y="0.0" width="375" height="44"/>

Delta/Database/Model/Human/ControllerSkin.swift

@@ -90,6 +90,11 @@ extension ControllerSkin: ControllerSkinProtocol
     {
         return self.controllerSkin?.aspectRatio(for: traits)
     }
+    
+    public func contentSize(for traits: DeltaCore.ControllerSkin.Traits) -> CGSize?
+    {
+        return self.controllerSkin?.contentSize(for: traits)
+    }
 }
 
 extension ControllerSkin: Syncable

Delta/Emulation/GameViewController.swift

@@ -670,6 +670,12 @@ private extension GameViewController
         {
             var touchControllerSkin = TouchControllerSkin(controllerSkin: controllerSkin)
             
+            if UIApplication.shared.isExternalDisplayConnected
+            {
+                // Only show touch screen if external display is connected.
+                touchControllerSkin.screenPredicate = { $0.isTouchScreen }
+            }
+                        
             if self.view.bounds.width > self.view.bounds.height
             {
                 touchControllerSkin.screenLayoutAxis = .horizontal
@@ -1119,8 +1125,10 @@ private extension GameViewController
         // We need to receive gameViewController(_:didUpdateGameViews) callback.
         scene.gameViewController.delegate = self
         
-        self.updateGameViews()
+        self.updateControllerSkin()
-        self.updateExternalDisplay()
+        
+        // Implicitly called from updateControllerSkin()
+        // self.updateExternalDisplay()
     }
     
     func updateExternalDisplay()
@@ -1132,7 +1140,37 @@ private extension GameViewController
             scene.game = self.game
         }
         
-        self.updateExternalDisplayGameViews()
+        var controllerSkin: ControllerSkinProtocol?
+        
+        if let game = self.game, let traits = scene.gameViewController.controllerView.controllerSkinTraits
+        {
+            if let standardSkin = DeltaCore.ControllerSkin.standardControllerSkin(for: game.type), standardSkin.supports(traits)
+            {
+                if standardSkin.hasTouchScreen(for: traits)
+                {
+                    // Only use TouchControllerSkin for standard controller skins with touch screens.
+                    
+                    var touchControllerSkin = DeltaCore.TouchControllerSkin(controllerSkin: standardSkin)
+                    touchControllerSkin.screenLayoutAxis = Settings.features.dsAirPlay.layoutAxis
+
+                    if Settings.features.dsAirPlay.topScreenOnly
+                    {
+                        touchControllerSkin.screenPredicate = { !$0.isTouchScreen }
+                    }
+
+                    controllerSkin = touchControllerSkin
+                }
+                else
+                {
+                    controllerSkin = standardSkin
+                }
+            }
+        }
+        
+        scene.gameViewController.controllerView.controllerSkin = controllerSkin
+        
+        // Implicitly called when assigning controllerSkin.
+        // self.updateExternalDisplayGameViews()
     }
     
     func updateExternalDisplayGameViews()
@@ -1154,7 +1192,7 @@ private extension GameViewController
             self.emulatorCore?.remove(gameView)
         }
         
-        self.updateGameViews()
+        self.updateControllerSkin() // Reset TouchControllerSkin + GameViews
     }
 }
 
@@ -1317,6 +1355,10 @@ private extension GameViewController
                 
         case .syncingService, .isAltJITEnabled: break
             
+        case Settings.features.dsAirPlay.$topScreenOnly.settingsKey: fallthrough
+        case Settings.features.dsAirPlay.$layoutAxis.settingsKey:
+            self.updateExternalDisplay()
+        
         default: break
         }
     }

Delta/Settings/Cores/MelonDSCoreSettingsViewController.swift

@@ -23,12 +23,19 @@ private extension MelonDSCoreSettingsViewController
     enum Section: Int
     {
         case general
+        case airPlay
         case performance
         case dsBIOS
         case dsiBIOS
         case changeCore
     }
     
+    enum AirPlayRow: Int, CaseIterable
+    {
+        case topScreenOnly
+        case layoutHorizontally
+    }
+    
     @available(iOS 13, *)
     enum BIOSError: LocalizedError
     {
@@ -265,6 +272,32 @@ private extension MelonDSCoreSettingsViewController
         Settings.isAltJITEnabled = sender.isOn
     }
     
+    @IBAction func toggleTopScreenOnly(_ sender: UISwitch)
+    {
+        Settings.features.dsAirPlay.topScreenOnly = sender.isOn
+        
+        self.tableView.performBatchUpdates({
+            let layoutHorizontallyIndexPath = IndexPath(row: AirPlayRow.layoutHorizontally.rawValue, section: Section.airPlay.rawValue)
+            if sender.isOn
+            {
+                self.tableView.deleteRows(at: [layoutHorizontallyIndexPath], with: .automatic)
+            }
+            else
+            {
+                self.tableView.insertRows(at: [layoutHorizontallyIndexPath], with: .automatic)
+            }
+        }) { _ in
+            self.tableView.reloadSections([Section.airPlay.rawValue], with: .none)
+        }
+    }
+    
+    @IBAction func toggleLayoutHorizontally(_ sender: UISwitch)
+    {
+        Settings.features.dsAirPlay.layoutAxis = sender.isOn ? .horizontal : .vertical
+        
+        self.tableView.reloadSections([Section.airPlay.rawValue], with: .none)
+    }
+    
     @objc func willEnterForeground(_ notification: Notification)
     {
         self.tableView.reloadData()
@@ -277,13 +310,11 @@ extension MelonDSCoreSettingsViewController
     {
         let section = Section(rawValue: sectionIndex)!
         
-        if isSectionHidden(section)
+        switch section
         {
-            return 0
+        case _ where isSectionHidden(section): return 0
-        }
+        case .airPlay where Settings.features.dsAirPlay.topScreenOnly: return 1 // Layout axis is irrelevant if only AirPlaying top screen.
-        else
+        default: return super.tableView(tableView, numberOfRowsInSection: sectionIndex)
-        {
-            return super.tableView(tableView, numberOfRowsInSection: sectionIndex)
         }
     }
     
@@ -313,6 +344,16 @@ extension MelonDSCoreSettingsViewController
             
             cell.contentView.isHidden = (item == nil)
             
+        case .airPlay:
+            let cell = cell as! SwitchTableViewCell
+            
+            let row = AirPlayRow.allCases[indexPath.row]
+            switch row
+            {
+            case .topScreenOnly: cell.switchView.isOn = Settings.features.dsAirPlay.topScreenOnly
+            case .layoutHorizontally: cell.switchView.isOn = (Settings.features.dsAirPlay.layoutAxis == .horizontal)
+            }
+            
         case .performance:
             let cell = cell as! SwitchTableViewCell
             cell.switchView.isOn = Settings.isAltJITEnabled
@@ -396,7 +437,7 @@ extension MelonDSCoreSettingsViewController
         case .changeCore:
             self.changeCore()
             
-        case .performance: break
+        case .airPlay, .performance: break
         }
     }
     
@@ -417,14 +458,18 @@ extension MelonDSCoreSettingsViewController
     override func tableView(_ tableView: UITableView, titleForFooterInSection section: Int) -> String?
     {
         let section = Section(rawValue: section)!
+        switch section
+        {
+        case _ where isSectionHidden(section): return nil
+        case .airPlay:
+            switch (Settings.features.dsAirPlay.topScreenOnly, Settings.features.dsAirPlay.layoutAxis)
+            {
+            case (true, _): return NSLocalizedString("When AirPlaying DS games, only the top screen will appear on the external display.", comment: "")
+            case (false, .vertical): return NSLocalizedString("When AirPlaying DS games, both screens will be stacked vertically on the external display.", comment: "")
+            case (false, .horizontal): return NSLocalizedString("When AirPlaying DS games, both screens will be placed side-by-side on the external display.", comment: "")
+            }
             
-        if isSectionHidden(section)
+        default: return super.tableView(tableView, titleForFooterInSection: section.rawValue)
-        {
-            return nil
-        }
-        else
-        {
-            return super.tableView(tableView, titleForFooterInSection: section.rawValue)
         }
     }
     

Delta/Settings/Features/DSAirPlay.swift

@@ -0,0 +1,23 @@
+//
+//  DSAirPlay.swift
+//  Delta
+//
+//  Created by Riley Testut on 4/26/23.
+//  Copyright © 2023 Riley Testut. All rights reserved.
+//
+
+import SwiftUI
+
+import DeltaFeatures
+import DeltaCore
+
+extension TouchControllerSkin.LayoutAxis: OptionValue {}
+
+struct DSAirPlayOptions
+{
+    @Option
+    var topScreenOnly: Bool = true
+    
+    @Option
+    var layoutAxis: TouchControllerSkin.LayoutAxis = .vertical
+}

Delta/Settings/Features/Features.swift

@@ -0,0 +1,25 @@
+//
+//  Features.swift
+//  Delta
+//
+//  Created by Riley Testut on 4/21/23.
+//  Copyright © 2023 Riley Testut. All rights reserved.
+//
+
+import DeltaFeatures
+
+extension Settings
+{
+    struct Features: FeatureContainer
+    {
+        static let shared = Features()
+        
+        @Feature(name: "DS AirPlay", options: DSAirPlayOptions())
+        var dsAirPlay
+        
+        private init()
+        {
+            self.prepareFeatures()
+        }
+    }
+}

Delta/Settings/Settings.swift

@@ -49,6 +49,8 @@ extension Settings
 
 struct Settings
 {
+    static let features = Features.shared
+    
     static func registerDefaults()
     {
         let defaults = [#keyPath(UserDefaults.translucentControllerSkinOpacity): 0.7,