[Experimental Features] Adds (unimplemented) VariableFastForward feature

Delta.xcodeproj/project.pbxproj

@@ -186,12 +186,14 @@
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+		D57D796129F31E7500BB2CF8 /* VariableFastForward.swift in Sources */ = {isa = PBXBuildFile; fileRef = D5A9C01C29DE058C00A8D610 /* VariableFastForward.swift */; };
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+		D5A9C01D29DE058C00A8D610 /* VariableFastForward.swift in Sources */ = {isa = PBXBuildFile; fileRef = D5A9C01C29DE058C00A8D610 /* VariableFastForward.swift */; };
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@@ -447,6 +449,7 @@
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 		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>"; };
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@@ -1044,6 +1047,7 @@
 			isa = PBXGroup;
 			children = (
 				D5A817B229DF6C6C00904AFE /* ExperimentalFeatures.swift */,
+				D58F39CB29E0A9C8008B4100 /* Features */,
 			);
 			path = "Experimental Features";
 			sourceTree = "<group>";
@@ -1060,6 +1064,14 @@
 			path = Cheats;
 			sourceTree = "<group>";
 		};
+		D58F39CB29E0A9C8008B4100 /* Features */ = {
+			isa = PBXGroup;
+			children = (
+				D5A9C01C29DE058C00A8D610 /* VariableFastForward.swift */,
+			);
+			path = Features;
+			sourceTree = "<group>";
+		};
 		D5A9BFFF29DDECF500A8D610 /* Experimental Features */ = {
 			isa = PBXGroup;
 			children = (
@@ -1485,6 +1497,7 @@
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 				BF13A7581D5D2FD9000BB055 /* EmulatorCore+Cheats.swift in Sources */,
 				BF48F74E219A16DA00BC2FC1 /* SyncingServicesViewController.swift in Sources */,
+				D5A9C01D29DE058C00A8D610 /* VariableFastForward.swift in Sources */,
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 				D51CB7A629EDC15900B59678 /* ExperimentalFeatures.swift in Sources */,
 				D57D796029F315F700BB2CF8 /* ExperimentalFeaturesView.swift in Sources */,
+				D57D796129F31E7500BB2CF8 /* VariableFastForward.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

Delta/Experimental Features/ExperimentalFeatures.swift

@@ -12,6 +12,11 @@ struct ExperimentalFeatures: FeatureContainer
 {
     static let shared = ExperimentalFeatures()
     
+    @Feature(name: "Variable Fast Forward",
+             description: "Change the preferred Fast Foward speed per-system. You can also change it by long-pressing the Fast Forward button from the Pause Menu.",
+             options: VariableFastForwardOptions())
+    var variableFastForward
+    
     private init()
     {
         self.prepareFeatures()

Delta/Experimental Features/Features/VariableFastForward.swift

@@ -0,0 +1,73 @@
+//
+//  VariableFastForward.swift
+//  Delta
+//
+//  Created by Riley Testut on 4/5/23.
+//  Copyright © 2023 Riley Testut. All rights reserved.
+//
+
+import SwiftUI
+
+import DeltaFeatures
+
+enum FastForwardSpeed: Double, CaseIterable, CustomStringConvertible
+{
+    case x2 = 2
+    case x3 = 3
+    case x4 = 4
+    case x8 = 8
+    
+    var description: String {
+        if #available(iOS 15, *)
+        {
+            let formattedText = self.rawValue.formatted(.number.decimalSeparator(strategy: .automatic))
+            return "\(formattedText)x"
+        }
+        else
+        {
+            return "\(self.rawValue)x"
+        }
+    }
+}
+
+extension FastForwardSpeed: LocalizedOptionValue
+{
+    var localizedDescription: Text {
+        Text(self.description)
+    }
+    
+    static var localizedNilDescription: Text {
+        Text("Maximum")
+    }
+}
+
+struct VariableFastForwardOptions
+{
+    // Alternatively, this feature could be implemented with single hidden dictionary @Option mapping preferred speeds to systems,
+    // because we support changing these values by long-pressing the Fast Forward button in the pause menu.
+    // However, we want to also show these options in Delta's settings, which requires us to explicitly define them one-by-one.
+    //
+    // @Option // No name = hidden
+    // var preferredSpeedsBySystem: [String: Double] = [:]
+    
+    @Option(name: "Nintendo", description: "Preferred NES fast forward speed.", values: FastForwardSpeed.allCases)
+    var nes: FastForwardSpeed?
+
+    @Option(name: "Super Nintendo", description: "Preferred SNES fast forward speed.", values: FastForwardSpeed.allCases)
+    var snes: FastForwardSpeed?
+    
+    @Option(name: "Sega Genesis", description: "Preferred Genesis fast forward speed.", values: FastForwardSpeed.allCases)
+    var genesis: FastForwardSpeed?
+
+    @Option(name: "Nintendo 64", description: "Preferred N64 fast forward speed.", values: FastForwardSpeed.allCases)
+    var n64: FastForwardSpeed?
+
+    @Option(name: "Game Boy Color", description: "Preferred GBC fast forward speed.", values: FastForwardSpeed.allCases)
+    var gbc: FastForwardSpeed?
+
+    @Option(name: "Game Boy Advance", description: "Preferred GBA fast forward speed.", values: FastForwardSpeed.allCases)
+    var gba: FastForwardSpeed?
+
+    @Option(name: "Nintendo DS", description: "Preferred DS fast forward speed.", values: FastForwardSpeed.allCases)
+    var ds: FastForwardSpeed?
+}

DeltaPreviews/Experimental Features/ExperimentalFeatures.swift

@@ -22,6 +22,11 @@ struct ExperimentalFeatures: FeatureContainer
              options: CustomTintColorOptions())
     var customTintColor
     
+    @Feature(name: "Variable Fast Forward",
+             description: "Change the preferred Fast Foward speed per-system. You can also change it by long-pressing the Fast Forward button from the Pause Menu.",
+             options: VariableFastForwardOptions())
+    var variableFastForward
+    
     private init()
     {
         self.prepareFeatures()