mirror of
https://github.com/Candygoblen123/SwiftNES.git
synced 2024-11-09 06:36:23 -06:00
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2 Commits
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59e7559d77
Author | SHA1 | Date | |
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59e7559d77 | ||
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bd21449256 |
@ -1,7 +1,8 @@
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class Bus {
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var cpuVram: [UInt8] = .init(repeating: 0, count: 2048)
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var prgRom: [UInt8]
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var ppu: NesPPU
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let ppu: NesPPU
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let joypad1: Joypad
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var cycles: Int = 0
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var gameloopCallback: (NesPPU) -> ()
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@ -12,20 +13,18 @@ class Bus {
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fileprivate let ROM_ADDRESS_START: UInt16 = 0x8000
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fileprivate let ROM_ADDRESS_END: UInt16 = 0xFFFF
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init(_ rom: Rom, gameloopCallback: @escaping (NesPPU) -> ()) {
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init(rom: Rom, joypad1: Joypad, gameloopCallback: @escaping (NesPPU) -> ()) {
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ppu = NesPPU(rom.character, rom.screenMirror)
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self.prgRom = rom.program
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self.gameloopCallback = gameloopCallback
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self.joypad1 = joypad1
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}
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func tick(_ cycles: UInt8) {
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self.cycles += Int(cycles)
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let nmiBefore = ppu.nmiInterrupt != nil
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//print(nmiBefore)
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self.ppu.tick(cycles * 3)
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let nmiAfter = ppu.nmiInterrupt != nil
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//print(nmiAfter)
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if !nmiBefore && nmiAfter {
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let newFrame = self.ppu.tick(cycles * 3)
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if newFrame {
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gameloopCallback(ppu)
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}
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@ -55,7 +54,7 @@ extension Bus: Memory {
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case 0x4000...0x4015:
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return 0 // Ignore APU
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case 0x4016:
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return 0 // Ignore Joy 1
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return joypad1.read()
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case 0x4017:
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return 0 // Ignore Joy 2
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case 0x2008...PPU_REGISTERS_MIRRORS_END:
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@ -96,7 +95,7 @@ extension Bus: Memory {
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case 0x4000...0x4013, 0x4015:
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return // Ignore APU
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case 0x4016:
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return // ignore Joy 1
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joypad1.write(data)
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case 0x4017:
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return // Ignore Joy 2
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case 0x4014:
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44
Sources/Joypad.swift
Normal file
44
Sources/Joypad.swift
Normal file
@ -0,0 +1,44 @@
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struct JoypadButton: OptionSet {
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var rawValue: UInt8
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static let RIGHT = JoypadButton(rawValue: 0b10000000)
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static let LEFT = JoypadButton(rawValue: 0b01000000)
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static let DOWN = JoypadButton(rawValue: 0b00100000)
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static let UP = JoypadButton(rawValue: 0b00010000)
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static let START = JoypadButton(rawValue: 0b00001000)
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static let SELECT = JoypadButton(rawValue: 0b00000100)
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static let BUTTON_B = JoypadButton(rawValue: 0b00000010)
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static let BUTTON_A = JoypadButton(rawValue: 0b00000001)
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}
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class Joypad {
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var strobe = false
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var buttonIndex: UInt8 = 0
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var buttonStatus = JoypadButton()
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func write(_ data: UInt8) {
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strobe = data & 1 == 1
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if strobe {
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buttonIndex = 0
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}
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}
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func read() -> UInt8 {
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if buttonIndex > 7 {
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return 1
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}
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let response = (buttonStatus.rawValue & (1 << buttonIndex)) >> buttonIndex
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if !strobe {
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buttonIndex += 1
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}
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return response
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}
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func setButton(_ button: JoypadButton, pressed: Bool) {
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if pressed {
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buttonStatus.insert(button)
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} else {
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buttonStatus.remove(button)
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}
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}
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}
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@ -13,7 +13,7 @@ class Render {
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var upper = tile[tile.startIndex + y]
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var lower = tile[tile.startIndex + y + 8]
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for x in (0...7).reversed() {
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for x in [7,6,5,4,3,2,1,0] {
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let value = (1 & lower) << 1 | (1 & upper)
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upper = upper >> 1
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lower = lower >> 1
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@ -32,53 +32,53 @@ class Render {
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frame.setPixel((tileLoc.col * 8 + x, tileLoc.row * 8 + y), rgb)
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}
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}
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}
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// MARK: Draw Sprites
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for i in stride(from: 0, to: ppu.oamData.count, by: 4) {
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let tileIndex = UInt16(ppu.oamData[i + 1])
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let tileX = Int(ppu.oamData[i + 3])
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let tileY = Int(ppu.oamData[i])
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// MARK: Draw Sprites
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for i in stride(from: 0, to: ppu.oamData.count, by: 4) {
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let tileIndex = UInt16(ppu.oamData[i + 1])
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let tileX = Int(ppu.oamData[i + 3])
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let tileY = Int(ppu.oamData[i])
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let flipVert = ppu.oamData[i + 2] >> 7 & 1 == 1
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let flipHori = ppu.oamData[i + 2] >> 6 & 1 == 1
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let flipVert = ppu.oamData[i + 2] >> 7 & 1 == 1
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let flipHori = ppu.oamData[i + 2] >> 6 & 1 == 1
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let paletteIndex = ppu.oamData[i + 2] & 0b11
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let spritePallete = getSpritePalette(ppu, paletteIndex: paletteIndex)
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let paletteIndex = ppu.oamData[i + 2] & 0b11
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let spritePallete = getSpritePalette(ppu, paletteIndex: paletteIndex)
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let bank = ppu.ctrl.spritePatternAddr()
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let tile = ppu.chrRom[(bank + Int(tileIndex) * 16)...(bank + Int(tileIndex) * 16 + 15)]
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let bank = ppu.ctrl.spritePatternAddr()
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let tile = ppu.chrRom[(bank + Int(tileIndex) * 16)...(bank + Int(tileIndex) * 16 + 15)]
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for y in 0...7 {
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var upper = tile[tile.startIndex + y]
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var lower = tile[tile.startIndex + y + 8]
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for y in 0...7 {
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var upper = tile[tile.startIndex + y]
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var lower = tile[tile.startIndex + y + 8]
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for x in (0...7).reversed() {
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let value = (1 & lower) << 1 | (1 & upper)
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upper = upper >> 1
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lower = lower >> 1
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if (value == 0) {
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continue // skip coloring this pixel, it's transparent
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}
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let rgb = switch value {
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case 1:
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NESColor.SYSTEM_PALLETE[Int(spritePallete[1])]
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case 2:
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NESColor.SYSTEM_PALLETE[Int(spritePallete[2])]
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case 3:
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NESColor.SYSTEM_PALLETE[Int(spritePallete[3])]
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default:
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fatalError("Invalid Pallete Color type")
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}
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switch (flipHori, flipVert) {
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case (false, false):
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frame.setPixel((tileX + x, tileY + y), rgb)
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case (true, false):
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frame.setPixel((tileX + 7 - x, tileY + y), rgb)
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case (false, true):
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frame.setPixel((tileX + x, tileY + 7 - y), rgb)
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case (true, true):
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frame.setPixel((tileX + 7 - x, tileY + 7 - y), rgb)
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}
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for x in [7,6,5,4,3,2,1,0] {
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let value = (1 & lower) << 1 | (1 & upper)
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upper = upper >> 1
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lower = lower >> 1
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if (value == 0) {
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continue // skip coloring this pixel, it's transparent
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}
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let rgb = switch value {
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case 1:
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NESColor.SYSTEM_PALLETE[Int(spritePallete[1])]
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case 2:
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NESColor.SYSTEM_PALLETE[Int(spritePallete[2])]
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case 3:
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NESColor.SYSTEM_PALLETE[Int(spritePallete[3])]
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default:
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fatalError("Invalid Pallete Color type")
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}
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switch (flipHori, flipVert) {
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case (false, false):
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frame.setPixel((tileX + x, tileY + y), rgb)
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case (true, false):
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frame.setPixel((tileX + 7 - x, tileY + y), rgb)
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case (false, true):
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frame.setPixel((tileX + x, tileY + 7 - y), rgb)
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case (true, true):
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frame.setPixel((tileX + 7 - x, tileY + 7 - y), rgb)
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}
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}
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}
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@ -21,87 +21,27 @@ SDL_RenderSetScale(canvas, 3.0, 3.0)
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var texture = SDL_CreateTexture(canvas, SDL_PIXELFORMAT_RGB24.rawValue, Int32(SDL_TEXTUREACCESS_TARGET.rawValue), 256, 240)
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var event = SDL_Event()
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var quit = false
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// func handleUserInput(_ cpu: CPU, event: inout SDL_Event) {
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// while SDL_PollEvent(&event) > 0 {
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// if event.type == SDL_QUIT.rawValue {
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// SDL_DestroyWindow(window)
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// SDL_Quit()
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// exit(0)
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// }
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// if event.type == SDL_KEYDOWN.rawValue {
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// switch SDL_KeyCode(UInt32(event.key.keysym.sym)) {
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// case SDLK_ESCAPE:
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// SDL_DestroyWindow(window)
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// SDL_Quit()
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// exit(0)
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// case SDLK_w:
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// cpu.memWrite(0xff, data: 0x77)
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// case SDLK_a:
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// cpu.memWrite(0xff, data: 0x61)
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// case SDLK_s:
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// cpu.memWrite(0xff, data: 0x73)
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// case SDLK_d:
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// cpu.memWrite(0xff, data: 0x64)
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// default:
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// continue
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// }
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// }
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// }
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// }
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// func color(_ byte: UInt8) -> SDL_Color {
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// switch byte{
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// case 0:
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// return SDL_Color(r: 0, g: 0, b: 0, a: 255)
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// case 1:
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// return SDL_Color(r: 255, g: 255, b: 255, a: 255)
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// case 2, 9:
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// return SDL_Color(r: 128, g: 128, b: 128, a: 255)
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// case 3, 10:
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// return SDL_Color(r: 255, g: 0, b: 0, a: 255)
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// case 4, 11:
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// return SDL_Color(r: 0, g: 255, b: 0, a: 255)
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// case 5, 12:
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// return SDL_Color(r: 0, g: 0, b: 255, a: 255)
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// case 6, 13:
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// return SDL_Color(r: 255, g: 0, b: 255, a: 255)
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// case 7, 14:
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// return SDL_Color(r: 255, g: 255, b: 0, a: 255)
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// default:
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// return SDL_Color(r: 0, g: 255, b: 255, a: 255)
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// }
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// }
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// func readScreenState(_ cpu: CPU, frame: inout [UInt8]) -> Bool {
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// var frame_idx = 0
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// var update = false
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// for i in 0x0200..<0x600 {
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// let color_idx = cpu.memRead(UInt16(i))
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// let color = color(color_idx)
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// let (b1, b2, b3) = (color.r, color.b, color.g)
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// if frame[frame_idx] != b1 || frame[frame_idx + 1] != b2 || frame[frame_idx + 2] != b3 {
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// frame[frame_idx] = b1;
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// frame[frame_idx + 1] = b2;
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// frame[frame_idx + 2] = b3;
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// update = true;
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// }
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// frame_idx += 3
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// }
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// return update
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// }
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guard let bytes = NSData(contentsOfFile: "pacman.nes") else { fatalError("Rom not found") }
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var gameCode = [UInt8](repeating: 0, count: bytes.length)
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bytes.getBytes(&gameCode, length: bytes.length)
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let rom = try Rom(gameCode)
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let joypad1 = Joypad()
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let keyMap = [
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SDLK_DOWN : JoypadButton.DOWN,
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SDLK_UP : JoypadButton.UP,
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SDLK_LEFT : JoypadButton.LEFT,
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SDLK_RIGHT : JoypadButton.RIGHT,
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SDLK_SPACE : JoypadButton.SELECT,
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SDLK_RETURN : JoypadButton.START,
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SDLK_a : JoypadButton.BUTTON_A,
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SDLK_s : JoypadButton.BUTTON_B
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]
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var frame = Frame()
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let bus = Bus(rom) { ppu in
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let bus = Bus(rom: rom, joypad1: joypad1) { ppu in
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Render.render(ppu, frame: frame)
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SDL_UpdateTexture(texture, nil, frame.data, 256 * 3)
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SDL_RenderCopy(canvas, texture, nil, nil)
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@ -114,75 +54,24 @@ let bus = Bus(rom) { ppu in
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exit(0)
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}
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if event.type == SDL_KEYDOWN.rawValue {
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switch SDL_KeyCode(UInt32(event.key.keysym.sym)) {
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let keyCode = SDL_KeyCode(UInt32(event.key.keysym.sym))
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switch keyCode {
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case SDLK_ESCAPE:
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SDL_DestroyWindow(window)
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SDL_Quit()
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exit(0)
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default:
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continue
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guard let key = keyMap[keyCode] else { continue }
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joypad1.setButton(key, pressed: true)
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}
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}
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if event.type == SDL_KEYUP.rawValue {
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guard let key = keyMap[SDL_KeyCode(UInt32(event.key.keysym.sym))] else { continue }
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joypad1.setButton(key, pressed: false)
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}
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}
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}
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let cpu = CPU(bus: bus)
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cpu.reset()
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cpu.run()
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// let tileFrame = TileViewer.showTile(chrRom: rom.character, bank: 1, tileNum: 0)
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// let tileFrame = TileViewer.showTileBank(chrRom: rom.character, bank: 1)
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// SDL_UpdateTexture(texture, nil, tileFrame.data, 256 * 3)
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// SDL_RenderCopy(canvas, texture, nil, nil)
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// SDL_RenderPresent(canvas)
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// while true {
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// while SDL_PollEvent(&event) > 0 {
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// if event.type == SDL_QUIT.rawValue {
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// SDL_DestroyWindow(window)
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// SDL_Quit()
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// exit(0)
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// }
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// if event.type == SDL_KEYDOWN.rawValue {
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// switch SDL_KeyCode(UInt32(event.key.keysym.sym)) {
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// case SDLK_ESCAPE:
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// SDL_DestroyWindow(window)
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// SDL_Quit()
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// exit(0)
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// default:
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// continue
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// }
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// }
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// }
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// }
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// let bus = Bus(try! Rom(gameCode))
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//var cpu = CPU(bus: bus)
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//cpu.load(gameCode)
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//cpu.reset()
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//cpu.programCounter = 0xC000
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// var screenState = [UInt8](repeating: 0, count: 32 * 3 * 32)
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// var rng = SystemRandomNumberGenerator()
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// cpu.run(onCycle: {
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// //print(dumpCpuState(cpu))
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// handleUserInput(cpu, event: &event)
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// cpu.memWrite(0xfe, data: UInt8.random(in: 1...16, using: &rng))
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// if readScreenState(cpu, frame: &screenState) {
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// SDL_UpdateTexture(texture, nil, screenState, 32 * 3)
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// SDL_RenderCopy(canvas, texture, nil, nil)
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// SDL_RenderPresent(canvas)
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// }
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// usleep(70)
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// }, onComplete: {
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// SDL_DestroyWindow(window)
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// SDL_Quit()
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// exit(0)
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// })
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// Infinite loop otherwise the program will exit prematurely
|
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// RunLoop.main.run()
|
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|
Loading…
Reference in New Issue
Block a user