74 lines
2.9 KiB
Swift
74 lines
2.9 KiB
Swift
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internal import CPlaydate
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extension Sound {
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/// A signal object; also provides custom signals driven by Swift
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/// callbacks. Wraps `PDSynthSignal`.
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public final class Signal: SignalValue {
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private static var api: UnsafePointer<playdate_sound_signal> { Playdate.signalAPI.unsafelyUnwrapped }
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private final class Box {
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let callbacks: Callbacks
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init(_ callbacks: Callbacks) { self.callbacks = callbacks }
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}
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/// Creates a signal driven by the given callbacks.
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public init(callbacks: Callbacks) {
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let box = Unmanaged.passRetained(Box(callbacks))
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let pointer = Signal.api.pointee.newSignal.unsafelyUnwrapped(
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{ userdata, ioFrames, interpolationValue in
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guard let userdata else { return 0 }
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let box = Unmanaged<Box>.fromOpaque(userdata).takeUnretainedValue()
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return box.callbacks.step(ioFrames, interpolationValue)
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},
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{ userdata, note, velocity, length in
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guard let userdata else { return }
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let box = Unmanaged<Box>.fromOpaque(userdata).takeUnretainedValue()
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box.callbacks.noteOn?(note, velocity, length)
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},
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{ userdata, stopped, offset in
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guard let userdata else { return }
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let box = Unmanaged<Box>.fromOpaque(userdata).takeUnretainedValue()
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box.callbacks.noteOff?(stopped != 0, Int(offset))
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},
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{ userdata in
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guard let userdata else { return }
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Unmanaged<Box>.fromOpaque(userdata).release()
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},
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box.toOpaque())
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super.init(pointer: pointer.unsafelyUnwrapped, isOwned: true)
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}
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/// Creates a plain signal object wrapping an existing signal value,
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/// so it can be scaled and offset.
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public init(value: SignalValue) {
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let pointer = Signal.api.pointee.newSignalForValue.unsafelyUnwrapped(value.pointer)
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super.init(pointer: pointer.unsafelyUnwrapped, isOwned: true)
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}
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override init(pointer: OpaquePointer, isOwned: Bool) {
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super.init(pointer: pointer, isOwned: isOwned)
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}
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deinit {
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if isOwned {
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Signal.api.pointee.freeSignal.unsafelyUnwrapped(pointer)
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}
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}
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/// The signal's current value.
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public var value: Float {
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Signal.api.pointee.getValue.unsafelyUnwrapped(pointer)
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}
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/// Scales the signal's output.
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public func setValueScale(_ scale: Float) {
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Signal.api.pointee.setValueScale.unsafelyUnwrapped(pointer, scale)
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}
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/// Offsets the signal's output.
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public func setValueOffset(_ offset: Float) {
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Signal.api.pointee.setValueOffset.unsafelyUnwrapped(pointer, offset)
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}
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}
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}
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