Restructured the source code in the Playdate bindings target.

2026-07-25 12:40:14 +02:00
parent 2e7ee12ec1
commit b435a6e8bd
106 changed files with 3754 additions and 3746 deletions
@@ -0,0 +1,41 @@
+extension Sound {
+    /// A source that produces audio by calling back into Swift.
+    public final class CallbackSource: Source {
+        let callback: Callback
+
+        /// Every callback source is kept alive here while the C side may
+        /// still invoke its trampoline: from creation until it is removed
+        /// with `Sound.removeSource`/`Channel.removeSource`, or until its
+        /// owning channel is freed.
+        nonisolated(unsafe) static var live: [CallbackSource] = []
+
+        /// Releases the registration added by `adopt(pointer:)`.
+        static func release(_ source: Source) {
+            live.removeAll { $0 === source }
+        }
+
+        init(callback: @escaping Callback) {
+            self.callback = callback
+            super.init(pointer: nil, isOwned: false)
+        }
+
+        var contextPointer: UnsafeMutableRawPointer {
+            Unmanaged.passUnretained(self).toOpaque()
+        }
+
+        static let trampoline: @convention(c) (UnsafeMutableRawPointer?, UnsafeMutablePointer<Int16>?,
+                                               UnsafeMutablePointer<Int16>?, Int32) -> Int32 = { context, left, right, length in
+            guard let context, let left else { return 0 }
+            let source = Unmanaged<CallbackSource>.fromOpaque(context).takeUnretainedValue()
+            let leftBuffer = UnsafeMutableBufferPointer(start: left, count: Int(length))
+            let rightBuffer = right.map { UnsafeMutableBufferPointer(start: $0, count: Int(length)) }
+            return source.callback(leftBuffer, rightBuffer) ? 1 : 0
+        }
+
+        /// Attaches the C object created for this source.
+        func adopt(pointer: OpaquePointer) {
+            self.pointer = pointer
+            CallbackSource.live.append(self)
+        }
+    }
+}