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PPU: background rendering

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This commit is contained in:
Andrew Glaze 2024-08-20 23:36:04 -04:00
parent be170bf750
commit f9efe23b0b
5 changed files with 15 additions and 8 deletions
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5
Sources/CPU/CPU.swift
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@ -157,9 +157,10 @@ class CPU {
func run(onCycle: @escaping () -> (), onComplete: @escaping () -> ()) { func run(onCycle: @escaping () -> (), onComplete: @escaping () -> ()) {
let opcodes = OPCODES_MAP let opcodes = OPCODES_MAP
while true { while true {
if let _nmi = bus.pollNMI() { if bus.pollNMI() != nil {
print(programCounter)
interrupt(.NMI) interrupt(.NMI)
print(programCounter)
} }
processOpcodes(onCycle: onCycle, opcodes: opcodes) { processOpcodes(onCycle: onCycle, opcodes: opcodes) {
onComplete() onComplete()

2
Sources/CPU/Trace.swift
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@ -9,7 +9,7 @@ func dumpCpuState(_ cpu: CPU) -> String {
{ {
let (addr, _) = cpu.getAbsoluteAddress(opcode.mode, addr: cpu.programCounter + 1) let (addr, _) = cpu.getAbsoluteAddress(opcode.mode, addr: cpu.programCounter + 1)
return (addr, cpu.memRead(addr)) return (addr, 0)//cpu.memRead(addr))
}() }()
} }

2
Sources/Data/Bus.swift
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@ -32,7 +32,7 @@ class Bus {
} }
func pollNMI() -> UInt8? { func pollNMI() -> UInt8? {
ppu.nmiInterrupt ppu.pollNMI()
} }
} }

10
Sources/PPU/NesPPU.swift
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@ -18,7 +18,7 @@ class NesPPU {
var scanline: UInt16 = 0 var scanline: UInt16 = 0
var cycles: Int = 0 var cycles: Int = 0
var nmiInterrupt: UInt8? var nmiInterrupt: UInt8? = nil
init(_ chrRom: [UInt8], _ mirroring: Mirroring) { init(_ chrRom: [UInt8], _ mirroring: Mirroring) {
self.chrRom = chrRom self.chrRom = chrRom
@ -52,6 +52,12 @@ class NesPPU {
return false return false
} }
func pollNMI() -> UInt8? {
let tmp = self.nmiInterrupt
self.nmiInterrupt = nil
return tmp
}
func writeToPPUAddr(_ value: UInt8) { func writeToPPUAddr(_ value: UInt8) {
addr.update(value) addr.update(value)
} }
@ -110,7 +116,7 @@ class NesPPU {
func writeToData(_ data: UInt8) { func writeToData(_ data: UInt8) {
let addr = addr.get() let addr = addr.get()
//print("\(addr): \(data)") print("\(addr): \(data)")
switch addr { switch addr {
case 0...0x1fff: case 0...0x1fff:
print("Attempt to write to chr rom space \(addr)!") print("Attempt to write to chr rom space \(addr)!")

4
Sources/PPU/Registers/ControlRegister.swift
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@ -28,7 +28,7 @@ struct ControlRegister: OptionSet {
static let GENERATE_NMI = ControlRegister(rawValue: 0b10000000) static let GENERATE_NMI = ControlRegister(rawValue: 0b10000000)
func vramAddrIncrement() -> UInt8 { func vramAddrIncrement() -> UInt8 {
if self.contains(.VRAM_ADD_INCREMENT) { if !self.contains(.VRAM_ADD_INCREMENT) {
1 1
} else { } else {
32 32
@ -40,7 +40,7 @@ struct ControlRegister: OptionSet {
} }
func backgroundPatternAddr() -> Int { func backgroundPatternAddr() -> Int {
if self.contains(.BACKROUND_PATTERN_ADDR) { if !self.contains(.BACKROUND_PATTERN_ADDR) {
0 0
} else { } else {
0x1000 0x1000