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73 lines
2.3 KiB
Swift
73 lines
2.3 KiB
Swift
//
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// MachineDocument.swift
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// Clock Signal
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//
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// Created by Thomas Harte on 04/01/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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import Cocoa
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import AudioToolbox
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class MachineDocument: NSDocument, CSOpenGLViewDelegate, CSOpenGLViewResponderDelegate, NSWindowDelegate {
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@IBOutlet weak var openGLView: CSOpenGLView! {
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didSet {
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openGLView.delegate = self
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openGLView.responderDelegate = self
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}
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}
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@IBOutlet weak var optionsPanel: NSPanel!
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@IBAction func showOptions(sender: AnyObject!) {
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optionsPanel?.setIsVisible(true)
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}
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lazy var audioQueue = AudioQueue()
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override func windowControllerDidLoadNib(aController: NSWindowController) {
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super.windowControllerDidLoadNib(aController)
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// bind the content aspect ratio to remain 4:3 from now on
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aController.window?.contentAspectRatio = NSSize(width: 4.0, height: 3.0)
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}
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var intendedCyclesPerSecond: Int64 = 0
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private var cycleCountError: Int64 = 0
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private var lastTime: CVTimeStamp?
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private var skippedFrames = 0
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final func openGLView(view: CSOpenGLView, didUpdateToTime time: CVTimeStamp, didSkipPreviousUpdate : Bool, frequency : Double) {
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if let lastTime = lastTime {
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// perform (time passed in seconds) * (intended cycles per second), converting and
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// maintaining an error count to deal with underflow
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let videoTimeScale64 = Int64(time.videoTimeScale)
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let videoTimeCount = ((time.videoTime - lastTime.videoTime) * intendedCyclesPerSecond) + cycleCountError
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cycleCountError = videoTimeCount % videoTimeScale64
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var numberOfCycles = videoTimeCount / videoTimeScale64
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// if the emulation has fallen behind then silently limit the request;
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// some actions — e.g. the host computer waking after sleep — may give us a
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// prohibitive backlog
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if didSkipPreviousUpdate {
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skippedFrames++
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} else {
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skippedFrames = 0
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}
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if skippedFrames > 4 {
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numberOfCycles = min(numberOfCycles, Int64(Double(intendedCyclesPerSecond) * frequency))
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}
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runForNumberOfCycles(Int32(numberOfCycles))
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}
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lastTime = time
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}
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func openGLView(view: CSOpenGLView, drawViewOnlyIfDirty onlyIfDirty: Bool) {}
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func runForNumberOfCycles(numberOfCycles: Int32) {}
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// MARK: CSOpenGLViewResponderDelegate
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func keyDown(event: NSEvent) {}
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func keyUp(event: NSEvent) {}
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func flagsChanged(newModifiers: NSEvent) {}
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}
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