mirror of
https://github.com/Candygoblen123/SwiftNES.git
synced 2024-11-24 18:06:47 -06:00
test snake game
This commit is contained in:
parent
c441014511
commit
5bdfebdf13
@ -1,3 +1,6 @@
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import Foundation
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import SDL
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enum AddressingMode {
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case Immediate
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case ZeroPage
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@ -61,7 +64,6 @@ class CPU {
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return base &+ UInt16(register_y)
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case .Indirect_X:
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let base = memRead(programCounter)
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let ptr = UInt8(base) &+ register_x
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let lo = memRead(UInt16(ptr))
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let hi = memRead(UInt16(ptr &+ 1))
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@ -101,184 +103,189 @@ class CPU {
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}
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func run() {
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run {
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run {}
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}
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func run(callback: @escaping () -> ()) {
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let opcodes = OPCODES_MAP
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Timer.scheduledTimer(withTimeInterval: 0.00007, repeats: true) { [self] timer in
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processOpcodes(callback: callback, opcodes: opcodes, timer: timer)
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}
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}
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func run(callback: () -> ()) {
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let opcodes = OPCODES_MAP
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func processOpcodes(callback: () -> (), opcodes: [UInt8: OpCode], timer: Timer) {
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callback()
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let code = memRead(programCounter)
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programCounter += 1
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while true {
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callback()
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let code = memRead(programCounter)
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programCounter += 1
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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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let programCounterState = programCounter
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guard let opcode = opcodes[code] else {fatalError("OpCode \(code) not recgonized!")}
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switch code {
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/// LDA
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case 0xa9, 0xa5, 0xb5, 0xad, 0xbd, 0xb9, 0xa1, 0xb1:
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lda(opcode.mode)
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/// STA
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case 0x85, 0x95, 0x8d, 0x9d, 0x99, 0x81, 0x91:
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sta(opcode.mode)
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case 0xd8:
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status.remove(.decimalMode)
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case 0x58:
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status.remove(.interruptDisable)
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case 0xb8:
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status.remove(.overflow)
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case 0x18:
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clearCarryFlag()
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case 0x38:
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setCarryFlag()
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case 0x78:
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status.insert(.interruptDisable)
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case 0xf8:
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status.insert(.decimalMode)
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case 0x48:
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stackPush(register_a)
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case 0x68:
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pla()
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case 0x08:
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php()
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case 0x28:
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plp()
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case 0x69, 0x65, 0x75, 0x6d, 0x7d, 0x79, 0x61, 0x71:
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adc(opcode.mode)
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case 0xe9, 0xe5, 0xf5, 0xed, 0xfd, 0xf9, 0xe1, 0xf1:
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sbc(opcode.mode)
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case 0x29, 0x25, 0x35, 0x2d, 0x3d, 0x39, 0x21, 0x31:
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and(opcode.mode)
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case 0x49, 0x45, 0x55, 0x4d, 0x5d, 0x59, 0x41, 0x51:
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eor(opcode.mode)
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case 0x09, 0x05, 0x15, 0x0d, 0x1d, 0x19, 0x01, 0x11:
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ora(opcode.mode)
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case 0x4a:
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lsrAccumulator()
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case 0x46, 0x56, 0x4e, 0x5e:
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_ = lsr(opcode.mode)
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case 0x0a:
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aslAccumulator()
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case 0x06, 0x16, 0x0e, 0x1e:
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_ = asl(opcode.mode)
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case 0x2a:
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rolAccumulator()
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case 0x26, 0x36, 0x2e, 0x3e:
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_ = rol(opcode.mode)
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case 0x6a:
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rorAccumulator()
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case 0x66, 0x76, 0x6e, 0x7e:
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_ = ror(opcode.mode)
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case 0xe6, 0xf6, 0xee, 0xfe:
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_ = inc(opcode.mode)
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case 0xc8:
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iny()
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case 0xc6, 0xd6, 0xce, 0xde:
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_ = dec(opcode.mode)
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case 0xca:
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dex()
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case 0x88:
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dey()
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case 0xc9, 0xc5, 0xd5, 0xcd, 0xdd, 0xd9, 0xc1, 0xd1:
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compare(mode: opcode.mode, compare_with: register_a)
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case 0xc0, 0xc4, 0xcc:
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compare(mode: opcode.mode, compare_with: register_y)
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case 0xe0, 0xe4, 0xec:
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compare(mode: opcode.mode, compare_with: register_x)
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case 0x4c:
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let memAddr = memReadU16(programCounter)
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programCounter = memAddr
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case 0x6c:
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let memAddr = memReadU16(programCounter)
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//6502 bug mode with with page boundary:
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// if address $3000 contains $40, $30FF contains $80, and $3100 contains $50,
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// the result of JMP ($30FF) will be a transfer of control to $4080 rather than $5080 as you intended
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// i.e. the 6502 took the low byte of the address from $30FF and the high byte from $3000
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let indirectRef: UInt16
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if memAddr & 0x00ff == 0x00ff {
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let lo = memRead(memAddr)
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let hi = memRead(memAddr & 0x00ff)
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indirectRef = UInt16(hi) << 8 | UInt16(lo)
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} else {
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indirectRef = memReadU16(memAddr)
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}
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programCounter = indirectRef
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case 0x20:
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stackPushU16(programCounter + 2 - 1)
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let targetAddr = memReadU16(programCounter)
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programCounter = targetAddr
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case 0x60:
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programCounter = stackPopU16() + 1
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case 0x40:
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status.rawValue = stackPop()
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status.remove(.break1)
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status.remove(.break2)
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programCounter = stackPopU16()
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case 0xd0:
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branch(!status.contains(.zero))
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case 0x70:
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branch(status.contains(.overflow))
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case 0x50:
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branch(!status.contains(.overflow))
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case 0x10:
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branch(!status.contains(.negative))
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case 0x30:
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branch(status.contains(.negative))
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case 0xf0:
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branch(status.contains(.zero))
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case 0xb0:
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branch(status.contains(.carry))
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case 0x90:
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branch(!status.contains(.carry))
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case 0x24, 0x2c:
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bit(opcode.mode)
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case 0x86, 0x96, 0x8e:
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let addr = getOpperandAddress(opcode.mode)
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memWrite(addr, data: register_x)
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case 0x84, 0x94, 0x8c:
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let addr = getOpperandAddress(opcode.mode)
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memWrite(addr, data: register_y)
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case 0xa2, 0xa6, 0xb6, 0xae, 0xbe:
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ldx(opcode.mode)
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case 0xa0, 0xa4, 0xb4, 0xac, 0xbc:
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ldy(opcode.mode)
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case 0xea:
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continue
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case 0xa8:
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register_y = register_x
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updateZeroAndNegativeFlags(register_y)
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case 0xba:
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register_x = stackPointer
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updateZeroAndNegativeFlags(register_x)
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case 0x8a:
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register_a = register_x
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updateZeroAndNegativeFlags(register_a)
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case 0x9a:
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stackPointer = register_x
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case 0x98:
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register_a = register_y
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updateZeroAndNegativeFlags(register_a)
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/// TAX
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case 0xaa:
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tax()
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/// INX
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case 0xe8:
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inx()
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/// BRK
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case 0x00:
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return
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default: fatalError("TODO!")
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switch code {
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/// LDA
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case 0xa9, 0xa5, 0xb5, 0xad, 0xbd, 0xb9, 0xa1, 0xb1:
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lda(opcode.mode)
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/// STA
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case 0x85, 0x95, 0x8d, 0x9d, 0x99, 0x81, 0x91:
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sta(opcode.mode)
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case 0xd8:
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status.remove(.decimalMode)
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case 0x58:
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status.remove(.interruptDisable)
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case 0xb8:
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status.remove(.overflow)
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case 0x18:
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clearCarryFlag()
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case 0x38:
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setCarryFlag()
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case 0x78:
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status.insert(.interruptDisable)
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case 0xf8:
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status.insert(.decimalMode)
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case 0x48:
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stackPush(register_a)
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case 0x68:
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pla()
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case 0x08:
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php()
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case 0x28:
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plp()
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case 0x69, 0x65, 0x75, 0x6d, 0x7d, 0x79, 0x61, 0x71:
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adc(opcode.mode)
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case 0xe9, 0xe5, 0xf5, 0xed, 0xfd, 0xf9, 0xe1, 0xf1:
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sbc(opcode.mode)
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case 0x29, 0x25, 0x35, 0x2d, 0x3d, 0x39, 0x21, 0x31:
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and(opcode.mode)
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case 0x49, 0x45, 0x55, 0x4d, 0x5d, 0x59, 0x41, 0x51:
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eor(opcode.mode)
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case 0x09, 0x05, 0x15, 0x0d, 0x1d, 0x19, 0x01, 0x11:
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ora(opcode.mode)
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case 0x4a:
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lsrAccumulator()
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case 0x46, 0x56, 0x4e, 0x5e:
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_ = lsr(opcode.mode)
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case 0x0a:
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aslAccumulator()
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case 0x06, 0x16, 0x0e, 0x1e:
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_ = asl(opcode.mode)
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case 0x2a:
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rolAccumulator()
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case 0x26, 0x36, 0x2e, 0x3e:
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_ = rol(opcode.mode)
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case 0x6a:
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rorAccumulator()
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case 0x66, 0x76, 0x6e, 0x7e:
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_ = ror(opcode.mode)
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case 0xe6, 0xf6, 0xee, 0xfe:
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_ = inc(opcode.mode)
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case 0xc8:
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iny()
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case 0xc6, 0xd6, 0xce, 0xde:
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_ = dec(opcode.mode)
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case 0xca:
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dex()
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case 0x88:
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dey()
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case 0xc9, 0xc5, 0xd5, 0xcd, 0xdd, 0xd9, 0xc1, 0xd1:
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compare(mode: opcode.mode, compare_with: register_a)
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case 0xc0, 0xc4, 0xcc:
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compare(mode: opcode.mode, compare_with: register_y)
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case 0xe0, 0xe4, 0xec:
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compare(mode: opcode.mode, compare_with: register_x)
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case 0x4c:
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let memAddr = memReadU16(programCounter)
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programCounter = memAddr
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case 0x6c:
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let memAddr = memReadU16(programCounter)
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//6502 bug mode with with page boundary:
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// if address $3000 contains $40, $30FF contains $80, and $3100 contains $50,
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// the result of JMP ($30FF) will be a transfer of control to $4080 rather than $5080 as you intended
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// i.e. the 6502 took the low byte of the address from $30FF and the high byte from $3000
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let indirectRef: UInt16
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if memAddr & 0x00ff == 0x00ff {
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let lo = memRead(memAddr)
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let hi = memRead(memAddr & 0x00ff)
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indirectRef = UInt16(hi) << 8 | UInt16(lo)
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} else {
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indirectRef = memReadU16(memAddr)
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}
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if programCounterState == programCounter {
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programCounter += UInt16(opcode.len - 1)
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}
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programCounter = indirectRef
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case 0x20:
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stackPushU16(programCounter + 2 - 1)
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let targetAddr = memReadU16(programCounter)
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programCounter = targetAddr
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case 0x60:
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programCounter = stackPopU16() + 1
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case 0x40:
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status.rawValue = stackPop()
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status.remove(.break1)
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status.remove(.break2)
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programCounter = stackPopU16()
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case 0xd0:
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branch(!status.contains(.zero))
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case 0x70:
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branch(status.contains(.overflow))
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case 0x50:
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branch(!status.contains(.overflow))
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case 0x10:
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branch(!status.contains(.negative))
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case 0x30:
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branch(status.contains(.negative))
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case 0xf0:
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branch(status.contains(.zero))
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case 0xb0:
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branch(status.contains(.carry))
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case 0x90:
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branch(!status.contains(.carry))
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case 0x24, 0x2c:
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bit(opcode.mode)
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case 0x86, 0x96, 0x8e:
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let addr = getOpperandAddress(opcode.mode)
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memWrite(addr, data: register_x)
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case 0x84, 0x94, 0x8c:
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let addr = getOpperandAddress(opcode.mode)
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memWrite(addr, data: register_y)
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case 0xa2, 0xa6, 0xb6, 0xae, 0xbe:
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ldx(opcode.mode)
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case 0xa0, 0xa4, 0xb4, 0xac, 0xbc:
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ldy(opcode.mode)
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case 0xea:
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return
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case 0xa8:
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register_y = register_x
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updateZeroAndNegativeFlags(register_y)
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case 0xba:
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register_x = stackPointer
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updateZeroAndNegativeFlags(register_x)
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case 0x8a:
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register_a = register_x
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updateZeroAndNegativeFlags(register_a)
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case 0x9a:
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stackPointer = register_x
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case 0x98:
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register_a = register_y
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updateZeroAndNegativeFlags(register_a)
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/// TAX
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case 0xaa:
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tax()
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/// INX
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case 0xe8:
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inx()
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/// BRK
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case 0x00:
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timer.invalidate()
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SDL_DestroyWindow(window)
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SDL_Quit()
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exit(0)
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default: fatalError("TODO!")
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}
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if programCounterState == programCounter {
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programCounter += UInt16(opcode.len - 1)
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}
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}
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@ -323,7 +330,7 @@ class CPU {
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status.remove(.carry)
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}
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let result = UInt8(sum)
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let result = UInt8(truncatingIfNeeded: sum)
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if (data ^ result) & (result ^ register_a) & 0x80 != 0 {
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status.insert(.overflow)
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@ -373,7 +380,6 @@ class CPU {
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func branch(_ condition: Bool) {
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if condition {
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let addr = memRead(programCounter)
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// print(addr)
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let jump: Int8 = Int8(bitPattern: addr)
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let jump_addr = programCounter &+ 1 &+ UInt16(bitPattern: Int16(jump))
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@ -61,8 +61,8 @@ extension CPU {
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func sbc(_ mode: AddressingMode) {
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let addr = getOpperandAddress(mode)
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let data = memRead(addr)
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let res = Int8(data) &* -1
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addToRegisterA(UInt8(res &- 1))
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let res = Int8(bitPattern: data) &* -1
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addToRegisterA(UInt8(bitPattern: res &- 1))
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}
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func adc(_ mode: AddressingMode) {
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@ -2,6 +2,7 @@
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// https://docs.swift.org/swift-book
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import SDL
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import Foundation
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guard SDL_Init(SDL_INIT_VIDEO) == 0 else {
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fatalError("SDL could not initialize! SDL_Error: \(String(cString: SDL_GetError()))")
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@ -17,6 +18,81 @@ let canvas = SDL_CreateRenderer(window, -1, SDL_RENDERER_PRESENTVSYNC.rawValue)
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SDL_RenderSetScale(canvas, 10.0, 10.0)
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var texture = SDL_CreateTexture(canvas, SDL_PIXELFORMAT_RGB24.rawValue, Int32(SDL_TEXTUREACCESS_TARGET.rawValue), 32, 32)
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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:
|
||||
return SDL_Color(r: 128, g: 128, b: 128, a: 255)
|
||||
case 3, 10:
|
||||
return SDL_Color(r: 255, g: 0, b: 0, a: 255)
|
||||
case 4, 11:
|
||||
return SDL_Color(r: 0, g: 255, b: 0, a: 255)
|
||||
case 5, 12:
|
||||
return SDL_Color(r: 0, g: 0, b: 255, a: 255)
|
||||
case 6, 13:
|
||||
return SDL_Color(r: 255, g: 0, b: 255, a: 255)
|
||||
case 7, 14:
|
||||
return SDL_Color(r: 255, g: 255, b: 0, a: 255)
|
||||
default:
|
||||
return SDL_Color(r: 0, g: 255, b: 255, a: 255)
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
func readScreenState(_ cpu: CPU, frame: inout [UInt8]) -> Bool {
|
||||
|
||||
var frame_idx = 0
|
||||
var update = false
|
||||
for i in 0x0200..<0x600 {
|
||||
let color_idx = cpu.memRead(UInt16(i))
|
||||
let color = color(color_idx)
|
||||
let (b1, b2, b3) = (color.r, color.b, color.g)
|
||||
if frame[frame_idx] != b1 || frame[frame_idx + 1] != b2 || frame[frame_idx + 2] != b3 {
|
||||
frame[frame_idx] = b1;
|
||||
frame[frame_idx + 1] = b2;
|
||||
frame[frame_idx + 2] = b3;
|
||||
update = true;
|
||||
}
|
||||
frame_idx += 3
|
||||
}
|
||||
return update
|
||||
}
|
||||
|
||||
let gameCode: [UInt8] = [
|
||||
0x20, 0x06, 0x06, 0x20, 0x38, 0x06, 0x20, 0x0d, 0x06, 0x20, 0x2a, 0x06, 0x60, 0xa9, 0x02, 0x85,
|
||||
@ -41,19 +117,23 @@ let gameCode: [UInt8] = [
|
||||
0xea, 0xca, 0xd0, 0xfb, 0x60
|
||||
]
|
||||
|
||||
print(gameCode[32])
|
||||
|
||||
|
||||
var cpu = CPU()
|
||||
cpu.load(gameCode)
|
||||
cpu.reset()
|
||||
|
||||
cpu.run {
|
||||
// TODO:
|
||||
// read user input and write it to mem[0xFF]
|
||||
// update mem[0xFE] with new Random Number
|
||||
// read mem mapped screen state
|
||||
// render screen state
|
||||
var screenState = [UInt8](repeating: 0, count: 32 * 3 * 32)
|
||||
var rng = SystemRandomNumberGenerator()
|
||||
|
||||
cpu.run() {
|
||||
handleUserInput(cpu, event: &event)
|
||||
cpu.memWrite(0xfe, data: UInt8.random(in: 1...16, using: &rng))
|
||||
|
||||
if readScreenState(cpu, frame: &screenState) {
|
||||
SDL_UpdateTexture(texture, nil, screenState, 32 * 3)
|
||||
SDL_RenderCopy(canvas, texture, nil, nil)
|
||||
SDL_RenderPresent(canvas)
|
||||
}
|
||||
}
|
||||
|
||||
// Infinite loop otherwise the program will exit prematurely
|
||||
RunLoop.main.run()
|
||||
|
||||
Loading…
Reference in New Issue
Block a user