41 lines
1.5 KiB
Swift
41 lines
1.5 KiB
Swift
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internal import CPlaydate
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extension Sound {
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/// A delay line effect. Wraps `DelayLine`.
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public final class DelayLine: Effect {
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private static var api: UnsafePointer<playdate_sound_effect_delayline> { Playdate.delayLineAPI.unsafelyUnwrapped }
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/// Creates a delay line holding `length` frames.
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public init(length: Int, stereo: Bool = false) {
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super.init(pointer: DelayLine.api.pointee.newDelayLine.unsafelyUnwrapped(
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Int32(length), stereo ? 1 : 0).unsafelyUnwrapped, isOwned: true)
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}
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deinit {
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if isOwned {
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DelayLine.api.pointee.freeDelayLine.unsafelyUnwrapped(pointer)
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}
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}
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/// Changes the delay length. Cannot be larger than the line's
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/// original length.
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public func setLength(frames: Int) {
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DelayLine.api.pointee.setLength.unsafelyUnwrapped(pointer, Int32(frames))
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}
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/// The feedback level, 0...1.
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public func setFeedback(_ feedback: Float) {
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DelayLine.api.pointee.setFeedback.unsafelyUnwrapped(pointer, feedback)
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}
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/// Adds a tap `delay` frames behind the write head. The tap can be
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/// added to a channel as a sound source.
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public func addTap(delay: Int) -> DelayLineTap? {
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guard let tap = DelayLine.api.pointee.addTap.unsafelyUnwrapped(pointer, Int32(delay)) else {
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return nil
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}
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return DelayLineTap(pointer: tap, delayLine: self)
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}
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}
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}
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