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https://github.com/Candygoblen123/SwiftNES.git
synced 2024-11-09 14:36:24 -06:00
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6974110b22
...
f9efe23b0b
@ -131,6 +131,7 @@ class CPU {
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status = [.interruptDisable, .break2]
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programCounter = self.memReadU16(0xFFFC)
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print(programCounter)
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}
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//func loadAndRun(_ program: [UInt8]) {
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@ -150,14 +151,16 @@ class CPU {
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//}
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func run() {
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run(onCycle: {}, onComplete: {})
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run(onCycle: { print(dumpCpuState(self)) }, onComplete: {})
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}
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func run(onCycle: @escaping () -> (), onComplete: @escaping () -> ()) {
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let opcodes = OPCODES_MAP
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while true {
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if bus.pollNMI() != nil {
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print(programCounter)
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interrupt(.NMI)
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print(programCounter)
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}
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processOpcodes(onCycle: onCycle, opcodes: opcodes) {
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onComplete()
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@ -194,6 +197,7 @@ class CPU {
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let programCounterState = programCounter
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guard let opcode = opcodes[code] else {fatalError("OpCode \(code) not recgonized!")}
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// print(programCounter, opcode.mnemonic)
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switch code {
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/// LDA
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@ -28,6 +28,7 @@ class NesPPU {
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func tick(_ cycles: UInt8) -> Bool {
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self.cycles += Int(cycles)
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if self.cycles >= 341 {
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//print(self.cycles)
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self.cycles = self.cycles - 341
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self.scanline += 1
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@ -36,6 +37,7 @@ class NesPPU {
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status.setSpriteZeroHit(false)
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if ctrl.generateVblankNMI() {
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nmiInterrupt = 1
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print("interrupt")
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}
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}
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@ -114,6 +116,7 @@ class NesPPU {
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func writeToData(_ data: UInt8) {
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let addr = addr.get()
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print("\(addr): \(data)")
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switch addr {
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case 0...0x1fff:
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print("Attempt to write to chr rom space \(addr)!")
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@ -46,28 +46,4 @@ struct ControlRegister: OptionSet {
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0x1000
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}
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}
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func spritePatternAddr() -> Int {
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if !self.contains(.SPRITE_PATTERN_ADDR) {
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0
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} else {
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0x1000
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}
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}
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func spriteSize() -> Int {
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if !self.contains(.SPRITE_SIZE) {
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8
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} else {
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16
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}
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}
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func masterSlaveSelect() -> Int {
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if !self.contains(.SPRITE_SIZE) {
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0
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} else {
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1
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}
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}
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}
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@ -2,117 +2,36 @@ class Render {
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static func render(_ ppu: NesPPU, frame: Frame) {
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let bank = ppu.ctrl.backgroundPatternAddr()
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for i in 0..<0x03c0 { // FIXME: For now, just use first nametable
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for i in 0..<0x03c0 { // For now, just use first nametable
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let tileAddr = UInt16(ppu.vram[i])
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let tileLoc = (col: i % 32, row: i / 32)
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//print(ppu.vram)
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let tileX = i % 32
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let tileY = i / 32
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let tile = ppu.chrRom[(bank + Int(tileAddr) * 16)...(bank + Int(tileAddr) * 16 + 15)]
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let bgPalette = getBgPalette(ppu, tileLoc: tileLoc)
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// MARK: Draw Background
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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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let value = (1 & upper) << 1 | (1 & lower)
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upper = upper >> 1
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lower = lower >> 1
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let rgb = switch value {
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case 0:
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NESColor.SYSTEM_PALLETE[Int(ppu.paletteTable[0])]
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NESColor.SYSTEM_PALLETE[0x01]
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case 1:
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NESColor.SYSTEM_PALLETE[Int(bgPalette[1])]
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NESColor.SYSTEM_PALLETE[0x23]
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case 2:
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NESColor.SYSTEM_PALLETE[Int(bgPalette[2])]
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NESColor.SYSTEM_PALLETE[0x28]
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case 3:
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NESColor.SYSTEM_PALLETE[Int(bgPalette[3])]
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NESColor.SYSTEM_PALLETE[0x31]
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default:
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fatalError("Invalid Pallete Color type")
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}
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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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// 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 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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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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}
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frame.setPixel((tileX * 8 + x, tileY * 8 + y), rgb)
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}
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}
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}
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}
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static func getBgPalette(_ ppu: NesPPU, tileLoc: (col: Int, row: Int)) -> [UInt8] {
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let attrTableIndex = tileLoc.row / 4 * 8 + tileLoc.col / 4
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let attrByte = ppu.vram[0x3c0 + attrTableIndex] // FIXME: still using hardcoded first nametable
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let palleteIndex = switch (tileLoc.col % 4 / 2, tileLoc.row % 4 / 2) {
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case (0,0):
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attrByte & 0b11
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case (1,0):
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(attrByte >> 2) & 0b11
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case (0,1):
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(attrByte >> 4) & 0b11
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case (1,1):
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(attrByte >> 6) & 0b11
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default:
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fatalError("Invalid titleLoc. This should never happen!")
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}
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let palleteStartIndex = 1 + Int(palleteIndex) * 4
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return [ppu.paletteTable[0], ppu.paletteTable[palleteStartIndex], ppu.paletteTable[palleteStartIndex + 1], ppu.paletteTable[palleteStartIndex + 2]]
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}
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static func getSpritePalette(_ ppu: NesPPU, paletteIndex: UInt8) -> [UInt8] {
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let start = 0x11 + Int(paletteIndex * 4)
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return [
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0,
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ppu.paletteTable[start],
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ppu.paletteTable[start + 1],
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ppu.paletteTable[start + 2]
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]
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}
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}
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