Converted get/set methods pairs to computed properties throughout the Playdate bindings target.

Examples/HelloPlaydate/Sources/HelloPlaydate/Game.swift

@@ -32,7 +32,7 @@ final class Game {
     private let boxSize = 24
 
     func start() {
-        Display.setRefreshRate(50)
+        Display.refreshRate = 50
 
         System.addMenuItem(title: "reset") { _ in
             Game.shared.reset()

README.md

@@ -103,7 +103,7 @@ final class Game {
     var player = Sprite()
 
     func start() {
-        Display.setRefreshRate(50)
+        Display.refreshRate = 50
 
         System.setUpdateCallback {
             self.update()
@@ -300,6 +300,7 @@ try Lua.addFunction(double, name: "mylib.double")
 ## Conventions
 
 - **Namespaces.** The subsystem namespaces (`System`, `Graphics`, `Sound`, …) live at the top level of the module; only the raw C API bootstrap stays under `Playdate` (`Playdate.initialize(with:)`, `Playdate.api`). On a name collision with another module, qualify with the module name: `PlaydateKit.System`.
+- **Properties vs. methods.** State the OS can report back is a property: read-write where the C API has a get/set pair (`Display.refreshRate`, `Source.volume`), get-only where it only has a getter (`Display.fps`). A `set…` method means the C API is write-only there (`Display.setScale`, `Synth.setAttackTime`) or setting takes extra arguments — a property getter never invents a value the OS can't return. Callbacks are installed with `set…Callback`/`set…Function` methods.
 - **Errors.** Fallible operations use typed throws — `throws(PlaydateError)` generally, `throws(Network.NetError)` for network I/O — so `catch` gives you a concrete type, and no `any Error` existentials are needed.
 - **Ownership.** A wrapper that *creates* a C object frees it on `deinit`; keep the wrapper referenced for as long as you use it. Wrappers vending OS-owned objects (a `Bitmap` from a `BitmapTable`, a track from a `Sequence`, …) don't free them — keep the owner alive instead, as documented on each API. Resources a C object keeps referencing (a sprite's image, a synth's sample, modulators, menu-item option titles) are retained by the wrapper automatically.
 - **Callbacks.** Where the C API provides a userdata slot, closures are supported everywhere and delivered back with the right wrapper. A few C callbacks have no userdata (serial messages, headphone changes, scoreboard

Sources/PlaydateKit/Display/Display.swift

@@ -13,15 +13,13 @@ extension Display {
     /// The display height in pixels, taking the current scale into account.
     public static var height: Int { Int(api.pointee.getHeight.unsafelyUnwrapped()) }
 
-    /// Sets the nominal refresh rate in frames per second. Pass 0 to update
+    /// The nominal refresh rate in frames per second. Set to 0 to update
     /// as fast as possible (the update callback drives the pace).
-    public static func setRefreshRate(_ rate: Float) {
-        api.pointee.setRefreshRate.unsafelyUnwrapped(rate)
+    public static var refreshRate: Float {
+        get { api.pointee.getRefreshRate.unsafelyUnwrapped() }
+        set { api.pointee.setRefreshRate.unsafelyUnwrapped(newValue) }
     }
 
-    /// The current nominal refresh rate.
-    public static var refreshRate: Float { api.pointee.getRefreshRate.unsafelyUnwrapped() }
-
     /// The measured average frames per second.
     public static var fps: Float { api.pointee.getFPS.unsafelyUnwrapped() }
 

Sources/PlaydateKit/Graphics/Graphics.swift

@@ -211,13 +211,9 @@ extension Graphics {
     }
 
     /// Extra space added between letters, in pixels.
-    public static func setTextTracking(_ tracking: Int) {
-        gfx.pointee.setTextTracking.unsafelyUnwrapped(Int32(tracking))
-    }
-
-    /// The extra space currently added between letters, in pixels.
     public static var textTracking: Int {
-        Int(gfx.pointee.getTextTracking.unsafelyUnwrapped())
+        get { Int(gfx.pointee.getTextTracking.unsafelyUnwrapped()) }
+        set { gfx.pointee.setTextTracking.unsafelyUnwrapped(Int32(newValue)) }
     }
 
     /// Adjusts the line height used when drawing multi-line text.

Sources/PlaydateKit/PlaydateKit.docc/GettingStarted.md

@@ -31,7 +31,7 @@ final class Game {
     nonisolated(unsafe) static let shared = Game()
 
     func start() {
-        Display.setRefreshRate(50)
+        Display.refreshRate = 50
 
         System.setUpdateCallback {
             self.update()

Sources/PlaydateKit/Sound/Classes/Channel.swift

@@ -119,13 +119,12 @@ extension Sound {
         }
 
         /// Modulates the channel's volume.
-        public func setVolumeModulator(_ modulator: SignalValue?) {
-            retain(modulator)
-            Channel.api.pointee.setVolumeModulator.unsafelyUnwrapped(pointer, modulator?.pointer)
-        }
-
         public var volumeModulator: SignalValue? {
-            SignalValue.wrap(Channel.api.pointee.getVolumeModulator.unsafelyUnwrapped(pointer))
+            get { SignalValue.wrap(Channel.api.pointee.getVolumeModulator.unsafelyUnwrapped(pointer)) }
+            set {
+                retain(newValue)
+                Channel.api.pointee.setVolumeModulator.unsafelyUnwrapped(pointer, newValue?.pointer)
+            }
         }
 
         /// The channel's stereo pan: -1 (left) to 1 (right).
@@ -135,13 +134,12 @@ extension Sound {
 
         /// Modulates the channel's pan. The signal's range 0...1 maps to
         /// left...right.
-        public func setPanModulator(_ modulator: SignalValue?) {
-            retain(modulator)
-            Channel.api.pointee.setPanModulator.unsafelyUnwrapped(pointer, modulator?.pointer)
-        }
-
         public var panModulator: SignalValue? {
-            SignalValue.wrap(Channel.api.pointee.getPanModulator.unsafelyUnwrapped(pointer))
+            get { SignalValue.wrap(Channel.api.pointee.getPanModulator.unsafelyUnwrapped(pointer)) }
+            set {
+                retain(newValue)
+                Channel.api.pointee.setPanModulator.unsafelyUnwrapped(pointer, newValue?.pointer)
+            }
         }
 
         /// A signal following the channel's dry (unprocessed) level.

Sources/PlaydateKit/Sound/Source/Classes/Source.swift

@@ -16,21 +16,19 @@ extension Sound {
             self.isOwned = isOwned
         }
 
-        /// Sets the playback volume for the left and right channels, 0...1.
-        public func setVolume(left: Float, right: Float) {
-            Source.api.pointee.setVolume.unsafelyUnwrapped(pointer, left, right)
+        /// The playback volume of the left and right channels, 0...1.
+        public var volume: (left: Float, right: Float) {
+            get {
+                var left: Float = 0, right: Float = 0
+                Source.api.pointee.getVolume.unsafelyUnwrapped(pointer, &left, &right)
+                return (left, right)
+            }
+            set { Source.api.pointee.setVolume.unsafelyUnwrapped(pointer, newValue.left, newValue.right) }
         }
 
         /// Sets the playback volume of both channels.
         public func setVolume(_ volume: Float) {
-            setVolume(left: volume, right: volume)
-        }
-
-        /// The playback volume of the left and right channels.
-        public var volume: (left: Float, right: Float) {
-            var left: Float = 0, right: Float = 0
-            Source.api.pointee.getVolume.unsafelyUnwrapped(pointer, &left, &right)
-            return (left, right)
+            self.volume = (volume, volume)
         }
 
         public var isPlaying: Bool {

Sources/PlaydateKit/Sound/Synth/Classes/Instrument.swift

@@ -93,16 +93,14 @@ extension Sound {
             Instrument.api.pointee.allNotesOff.unsafelyUnwrapped(pointer, when)
         }
 
-        /// Sets the volume of the left and right channels, 0...1.
-        public func setVolume(left: Float, right: Float) {
-            Instrument.api.pointee.setVolume.unsafelyUnwrapped(pointer, left, right)
-        }
-
-        /// The volume of the left and right channels.
+        /// The volume of the left and right channels, 0...1.
         public var volume: (left: Float, right: Float) {
-            var left: Float = 0, right: Float = 0
-            Instrument.api.pointee.getVolume.unsafelyUnwrapped(pointer, &left, &right)
-            return (left, right)
+            get {
+                var left: Float = 0, right: Float = 0
+                Instrument.api.pointee.getVolume.unsafelyUnwrapped(pointer, &left, &right)
+                return (left, right)
+            }
+            set { Instrument.api.pointee.setVolume.unsafelyUnwrapped(pointer, newValue.left, newValue.right) }
         }
 
         /// The number of voices currently playing.