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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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10
Sources/PPU/NesPPU.swift
View File

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

4
Sources/PPU/Registers/ControlRegister.swift
View File

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