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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/// An ADSR envelope signal. Wraps `PDSynthEnvelope`.
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public final class Envelope: SignalValue {
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private static var api: UnsafePointer<playdate_sound_envelope> { Playdate.envelopeAPI.unsafelyUnwrapped }
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/// Creates an envelope with the given attack and decay times
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/// (seconds), sustain level (0...1), and release time (seconds).
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public init(attack: Float = 0, decay: Float = 0, sustain: Float = 1, release: Float = 0) {
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let pointer = Envelope.api.pointee.newEnvelope.unsafelyUnwrapped(attack, decay, sustain, release)
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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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Envelope.api.pointee.freeEnvelope.unsafelyUnwrapped(pointer)
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}
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}
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public func setAttack(_ attack: Float) {
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Envelope.api.pointee.setAttack.unsafelyUnwrapped(pointer, attack)
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}
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public func setDecay(_ decay: Float) {
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Envelope.api.pointee.setDecay.unsafelyUnwrapped(pointer, decay)
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}
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public func setSustain(_ sustain: Float) {
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Envelope.api.pointee.setSustain.unsafelyUnwrapped(pointer, sustain)
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}
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public func setRelease(_ release: Float) {
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Envelope.api.pointee.setRelease.unsafelyUnwrapped(pointer, release)
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}
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/// When `true`, a new note while a note is playing does not restart
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/// the envelope.
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public func setLegato(_ flag: Bool) {
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Envelope.api.pointee.setLegato.unsafelyUnwrapped(pointer, flag ? 1 : 0)
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}
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/// When `true`, a new note restarts the envelope from zero instead of
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/// its current value.
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public func setRetrigger(_ flag: Bool) {
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Envelope.api.pointee.setRetrigger.unsafelyUnwrapped(pointer, flag ? 1 : 0)
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}
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/// Bends the envelope's segments: 0 is linear, 1 is maximum curvature.
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public func setCurvature(_ amount: Float) {
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Envelope.api.pointee.setCurvature.unsafelyUnwrapped(pointer, amount)
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}
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/// How much note velocity scales the envelope's output.
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public func setVelocitySensitivity(_ sensitivity: Float) {
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Envelope.api.pointee.setVelocitySensitivity.unsafelyUnwrapped(pointer, sensitivity)
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}
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/// Scales the envelope's rate by note: notes above `start` play the
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/// envelope faster (up to `scaling` at `end` and beyond).
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public func setRateScaling(_ scaling: Float, start: MIDINote, end: MIDINote) {
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Envelope.api.pointee.setRateScaling.unsafelyUnwrapped(pointer, scaling, start, end)
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}
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public var value: Float {
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Envelope.api.pointee.getValue.unsafelyUnwrapped(pointer)
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}
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}
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}
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