243 lines
9.2 KiB
Swift
243 lines
9.2 KiB
Swift
//
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// EmulatedSystem.swift
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// FruitMachine
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//
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// Created by Christopher Rohl on 8/1/17.
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// Copyright © 2017 Christopher Rohl. All rights reserved.
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//
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import Cocoa
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protocol EmulatedSystem {
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var CPU_FREQUENCY: Double { get }
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var FRAMES_PER_SECOND: Double { get }
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var CYCLES_PER_BATCH: Int { get }
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var cg: AppleIIBase.A2CharacterGenerator { get }
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init(cpuFrequency: Double, fps: Double, delegate: AppleIIBase.ScreenDelegate, view: AppleIIBase.ScreenView, chargen: AppleIIBase.A2CharacterGenerator
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)
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func installOverrides()
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func loadROMs()
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}
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var EmulatedSystemInstance: AppleIIBase?
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class AppleIIBase: NSObject, EmulatedSystem {
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//Peripherals
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//var backplane = [Int: Peripheral]()
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var backplane = [Peripheral?](repeating: nil, count: 8)
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var frameCounter: Int = 0
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var CPU_FREQUENCY: Double
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var FRAMES_PER_SECOND: Double
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var CYCLES_PER_BATCH: Int
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let cg: A2CharacterGenerator
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var videoSoftswitches = VideoSoftswitches()
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var videoMode: VideoMode = .Text
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let keyboardController = KeyboardController()
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var emulatorViewDelegate: ScreenDelegate
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var emulatorView: ScreenView
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var emuScreenLayer = CALayer()
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required init(cpuFrequency: Double, fps: Double, delegate: ScreenDelegate, view: ScreenView, chargen: A2CharacterGenerator) {
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CPU_FREQUENCY = cpuFrequency
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FRAMES_PER_SECOND = fps
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CYCLES_PER_BATCH = Int(CPU_FREQUENCY / FRAMES_PER_SECOND)
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cg = chargen
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emulatorViewDelegate = delegate
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emulatorView = view
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super.init()
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for i in 0...7 {
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backplane[i] = nil
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}
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setupMemory(ramConfig: .fortyeightK)
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setupPeripherals()
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emuScreenLayer.shouldRasterize = true
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emuScreenLayer.delegate = emulatorViewDelegate
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emuScreenLayer.frame = emulatorView.bounds
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emulatorView.wantsLayer = true
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emulatorView.layer?.addSublayer(emuScreenLayer)
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installOverrides()
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}
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enum MemoryConfiguration {
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case fourK
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case sixteenK
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case fortyeightK
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}
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func setupMemory(ramConfig: MemoryConfiguration) {
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let ramPages: Int
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switch ramConfig {
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case .fourK:
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ramPages = 4096 / 256
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case .sixteenK:
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ramPages = 16384 / 256
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case .fortyeightK:
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ramPages = 49152 / 256
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}
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for page in 0 ..< ramPages {
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CPU.sharedInstance.memoryInterface.pages[page] = MemoryInterface.pageMode.rw //RAM
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}
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for page in ramPages ..< 192 {
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CPU.sharedInstance.memoryInterface.pages[page] = MemoryInterface.pageMode.null //not connected
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}
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for page in 192 ..< 256 {
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CPU.sharedInstance.memoryInterface.pages[page] = MemoryInterface.pageMode.rw //Bankswitching area
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}
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}
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func setupPeripherals() {
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let defaults = UserDefaults.standard
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let slot0 = defaults.string(forKey: "a2_Peripherals_Slot0")
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if(slot0 == "Language Card (16K)") {
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backplane[0] = LanguageCard16K(slot: 0, romPath: "/Users/luigi/apple2/peripherals/341-0020-00.f8")
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}
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let slot6 = defaults.string(forKey: "a2_Peripherals_Slot6")
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if(slot6 == "Disk II") {
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backplane[6] = DiskII(slot: 6, romPath: "/Users/luigi/apple2/peripherals/341-0027-a.p5")
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(backplane[6] as! DiskII).attachDiskImage(imagePath: "/Users/luigi/apple2/Prodos_2_4_1.po")
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//(backplane[6] as! DiskII).attachDiskImage(imagePath: "/Users/luigi/apple2/Apex II - Apple II Diagnostic (v4.7-1986).do")
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}
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}
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func attachImageToDiskDrive(drive: Peripheral, image: String) {
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print("drive is \(drive)")
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(drive as! DiskII).attachDiskImage(imagePath: image)
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}
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func doColdReset() {
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CPU.sharedInstance.coldReset()
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doReset()
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}
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func doReset() {
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videoSoftswitches.reset()
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videoMode = .Text
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CPU.sharedInstance.performReset()
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}
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func runFrame() {
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frameCounter = (frameCounter + 1) % 60
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if(frameCounter % 15) == 0 {
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emulatorViewDelegate.flashIsInverse = !emulatorViewDelegate.flashIsInverse
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}
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CPU.sharedInstance.cycles = 0
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CPU.sharedInstance.cyclesInBatch = CYCLES_PER_BATCH
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CPU.sharedInstance.runCyclesBatch()
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updateScreen()
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}
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func updateScreen() {
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CVPixelBufferLockBaseAddress(emulatorViewDelegate.pixels!, CVPixelBufferLockFlags(rawValue: 0))
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let pixelBase = CVPixelBufferGetBaseAddress(emulatorViewDelegate.pixels!)
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let buf = pixelBase?.assumingMemoryBound(to: BitmapPixelsLE555.PixelData.self)
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videoMode = getCurrentVideoMode(switches: videoSoftswitches)
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let videoMemoryStart: Address
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let hgrMemoryStart: Address
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if(videoSoftswitches.PAGE_2) {
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videoMemoryStart = 0x800
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hgrMemoryStart = 0x4000
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} else {
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videoMemoryStart = 0x400
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hgrMemoryStart = 0x2000
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}
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if(videoMode == .Text)
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{
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//Text mode: Get character codes from $0400-$07FF
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putGlyphs(buffer: buf!, start: videoMemoryStart, end: videoMemoryStart + 0x3F8)
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}
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else if(videoMode == .Lores)
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{
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putLoresPixels(buffer: buf!, start: videoMemoryStart, end: videoMemoryStart + 0x3F8)
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}
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else if(videoMode == .MixedLores) {
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//Draw the lores pixel rows.
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putLoresPixels(buffer: buf!, start: videoMemoryStart, end: videoMemoryStart + 0x250)
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putLoresPixels(buffer: buf!, start: videoMemoryStart + 0x280, end: videoMemoryStart + 0x2A8)
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putLoresPixels(buffer: buf!, start: videoMemoryStart + 0x300, end: videoMemoryStart + 0x328)
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putLoresPixels(buffer: buf!, start: videoMemoryStart + 0x380, end: videoMemoryStart + 0x3A8)
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putLoresPixels(buffer: buf!, start: videoMemoryStart + 0x2A8, end: videoMemoryStart + 0x2D0)
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putLoresPixels(buffer: buf!, start: videoMemoryStart + 0x328, end: videoMemoryStart + 0x350)
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putLoresPixels(buffer: buf!, start: videoMemoryStart + 0x3A8, end: videoMemoryStart + 0x3D0)
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//Draw the bottom 4 text rows.
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putGlyphs(buffer: buf!, start: videoMemoryStart + 0x250, end: videoMemoryStart + 0x278)
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putGlyphs(buffer: buf!, start: videoMemoryStart + 0x2D0, end: videoMemoryStart + 0x2F8)
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putGlyphs(buffer: buf!, start: videoMemoryStart + 0x350, end: videoMemoryStart + 0x378)
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putGlyphs(buffer: buf!, start: videoMemoryStart + 0x3D0, end: videoMemoryStart + 0x3F8)
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} else if(videoMode == .Hires) {
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putHiresPixels(buffer: buf!, start: hgrMemoryStart, end: hgrMemoryStart + 0x1fff)
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} else if(videoMode == .MixedHires) {
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putHiresPixels(buffer: buf!, start: hgrMemoryStart, end: hgrMemoryStart + 0x1fff)
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//Draw the bottom 4 text rows.
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putGlyphs(buffer: buf!, start: videoMemoryStart + 0x250, end: videoMemoryStart + 0x278)
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putGlyphs(buffer: buf!, start: videoMemoryStart + 0x2D0, end: videoMemoryStart + 0x2F8)
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putGlyphs(buffer: buf!, start: videoMemoryStart + 0x350, end: videoMemoryStart + 0x378)
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putGlyphs(buffer: buf!, start: videoMemoryStart + 0x3D0, end: videoMemoryStart + 0x3F8)
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}
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CVPixelBufferUnlockBaseAddress(emulatorViewDelegate.pixels!, CVPixelBufferLockFlags(rawValue: 0))
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emulatorView.setNeedsDisplay(emulatorView.frame)
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}
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/* Video */
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func putHiresPixels(buffer: UnsafeMutablePointer<BitmapPixelsLE555.PixelData>, start: UInt16, end: UInt16) {
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for address in start ..< end {
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let pixelData = CPU.sharedInstance.memoryInterface.readByte(offset: UInt16(address), bypassOverrides: true)
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HiresMode.putHiresByte(buffer: buffer,
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pixel: pixelData,
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address: UInt16(address))
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}
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}
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func putLoresPixels(buffer: UnsafeMutablePointer<BitmapPixelsLE555.PixelData>, start: UInt16, end: UInt16) {
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for address in start ..< end {
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let pixelData = CPU.sharedInstance.memoryInterface.readByte(offset: UInt16(address), bypassOverrides: true)
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LoresMode.putLoresPixel(buffer: buffer,
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pixel: pixelData,
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address: UInt16(address))
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}
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}
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func putGlyphs(buffer: UnsafeMutablePointer<BitmapPixelsLE555.PixelData>, start: UInt16, end: UInt16) {
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for address in start ... end {
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let charCode = CPU.sharedInstance.memoryInterface.readByte(offset: UInt16(address), bypassOverrides: true)
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TextMode.putGlyph(buffer: buffer,
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glyph: cg.glyphs[Int(charCode & 0x3F)],
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attributes: charCode & 0xC0, //d6 and d7
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pixelPosition: VideoHelpers.getPixelOffset(memoryOffset: Int(address - 0x400)))
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}
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}
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func installOverrides() { }
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func loadROMs() { }
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}
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