chore: better conform to zig idioms

Less verbose, specifying arm7tdmi doesn't really do much when there's
no other CPU in the system

src/Gui.zig

@@ -53,11 +53,11 @@ pub fn init(title: [12]u8, width: i32, height: i32) Self {
     };
 }
 
-pub fn run(self: *Self, arm7tdmi: *Arm7tdmi, scheduler: *Scheduler) !void {
+pub fn run(self: *Self, cpu: *Arm7tdmi, scheduler: *Scheduler) !void {
     var quit = std.atomic.Atomic(bool).init(false);
     var frame_rate = FpsTracker.init();
 
-    const thread = try std.Thread.spawn(.{}, emu.run, .{ &quit, &frame_rate, scheduler, arm7tdmi });
+    const thread = try std.Thread.spawn(.{}, emu.run, .{ &quit, &frame_rate, scheduler, cpu });
     defer thread.join();
 
     var title_buf: [0x100]u8 = [_]u8{0} ** 0x100;
@@ -68,7 +68,7 @@ pub fn run(self: *Self, arm7tdmi: *Arm7tdmi, scheduler: *Scheduler) !void {
             switch (event.type) {
                 SDL.SDL_QUIT => break :emu_loop,
                 SDL.SDL_KEYDOWN => {
-                    const io = &arm7tdmi.bus.io;
+                    const io = &cpu.bus.io;
                     const key_code = event.key.keysym.sym;
 
                     switch (key_code) {
@@ -86,7 +86,7 @@ pub fn run(self: *Self, arm7tdmi: *Arm7tdmi, scheduler: *Scheduler) !void {
                     }
                 },
                 SDL.SDL_KEYUP => {
-                    const io = &arm7tdmi.bus.io;
+                    const io = &cpu.bus.io;
                     const key_code = event.key.keysym.sym;
 
                     switch (key_code) {
@@ -100,12 +100,12 @@ pub fn run(self: *Self, arm7tdmi: *Arm7tdmi, scheduler: *Scheduler) !void {
                         SDL.SDLK_s => io.keyinput.shoulder_r.set(),
                         SDL.SDLK_RETURN => io.keyinput.start.set(),
                         SDL.SDLK_RSHIFT => io.keyinput.select.set(),
-                        SDL.SDLK_i => log.err("Sample Count: {}", .{@intCast(u32, SDL.SDL_AudioStreamAvailable(arm7tdmi.bus.apu.stream)) / (2 * @sizeOf(u16))}),
+                        SDL.SDLK_i => log.err("Sample Count: {}", .{@intCast(u32, SDL.SDL_AudioStreamAvailable(cpu.bus.apu.stream)) / (2 * @sizeOf(u16))}),
                         SDL.SDLK_j => log.err("Scheduler Capacity: {} | Scheduler Event Count: {}", .{ scheduler.queue.capacity(), scheduler.queue.count() }),
                         SDL.SDLK_k => {
                             // Dump IWRAM to file
-                            log.info("PC: 0x{X:0>8}", .{arm7tdmi.r[15]});
-                            log.info("LR: 0x{X:0>8}", .{arm7tdmi.r[14]});
+                            log.info("PC: 0x{X:0>8}", .{cpu.r[15]});
+                            log.info("LR: 0x{X:0>8}", .{cpu.r[14]});
                             // const iwram_file = try std.fs.cwd().createFile("iwram.bin", .{});
                             // defer iwram_file.close();
 
@@ -119,7 +119,7 @@ pub fn run(self: *Self, arm7tdmi: *Arm7tdmi, scheduler: *Scheduler) !void {
         }
 
         // Emulator has an internal Double Buffer
-        const framebuf = arm7tdmi.bus.ppu.framebuf.get(.Renderer);
+        const framebuf = cpu.bus.ppu.framebuf.get(.Renderer);
         _ = SDL.SDL_UpdateTexture(self.texture, null, framebuf.ptr, pitch);
         _ = SDL.SDL_RenderCopy(self.renderer, self.texture, null, null);
         SDL.SDL_RenderPresent(self.renderer);
@@ -174,8 +174,8 @@ const Audio = struct {
         self.* = undefined;
     }
 
-    pub fn play(this: *This) void {
-        SDL.SDL_PauseAudioDevice(this.device, 0);
+    pub fn play(self: *This) void {
+        SDL.SDL_PauseAudioDevice(self.device, 0);
     }
 
     export fn callback(userdata: ?*anyopaque, stream: [*c]u8, len: c_int) void {

src/core/Bus.zig

@@ -49,14 +49,14 @@ io: Io,
 cpu: ?*Arm7tdmi,
 sched: *Scheduler,
 
-pub fn init(self: *Self, alloc: Allocator, sched: *Scheduler, cpu: *Arm7tdmi, paths: FilePaths) !void {
+pub fn init(self: *Self, allocator: Allocator, sched: *Scheduler, cpu: *Arm7tdmi, paths: FilePaths) !void {
     self.* = .{
-        .pak = try GamePak.init(alloc, paths.rom, paths.save),
-        .bios = try Bios.init(alloc, paths.bios),
-        .ppu = try Ppu.init(alloc, sched),
+        .pak = try GamePak.init(allocator, paths.rom, paths.save),
+        .bios = try Bios.init(allocator, paths.bios),
+        .ppu = try Ppu.init(allocator, sched),
         .apu = Apu.init(sched),
-        .iwram = try Iwram.init(alloc),
-        .ewram = try Ewram.init(alloc),
+        .iwram = try Iwram.init(allocator),
+        .ewram = try Ewram.init(allocator),
         .dma = createDmaTuple(),
         .tim = createTimerTuple(sched),
         .io = Io.init(),
@@ -65,22 +65,6 @@ pub fn init(self: *Self, alloc: Allocator, sched: *Scheduler, cpu: *Arm7tdmi, pa
     };
 }
 
-// pub fn init(alloc: Allocator, sched: *Scheduler, paths: FilePaths) !Self {
-//     return Self{
-//         .pak = try GamePak.init(alloc, paths.rom, paths.save),
-//         .bios = try Bios.init(alloc, paths.bios),
-//         .ppu = try Ppu.init(alloc, sched),
-//         .apu = Apu.init(sched),
-//         .iwram = try Iwram.init(alloc),
-//         .ewram = try Ewram.init(alloc),
-//         .dma = createDmaTuple(),
-//         .tim = createTimerTuple(sched),
-//         .io = Io.init(),
-//         .cpu = null,
-//         .sched = sched,
-//     };
-// }
-
 pub fn deinit(self: *Self) void {
     self.iwram.deinit();
     self.ewram.deinit();

src/core/apu.zig

@@ -444,29 +444,29 @@ const ToneSweep = struct {
             };
         }
 
-        pub fn tick(this: *This, ch1: *Self) void {
-            if (this.timer != 0) this.timer -= 1;
+        pub fn tick(self: *This, ch1: *Self) void {
+            if (self.timer != 0) self.timer -= 1;
 
-            if (this.timer == 0) {
+            if (self.timer == 0) {
                 const period = ch1.sweep.period.read();
-                this.timer = if (period == 0) 8 else period;
-                if (!this.calc_performed) this.calc_performed = true;
+                self.timer = if (period == 0) 8 else period;
+                if (!self.calc_performed) self.calc_performed = true;
 
-                if (this.enabled and period != 0) {
-                    const new_freq = this.calcFrequency(ch1);
+                if (self.enabled and period != 0) {
+                    const new_freq = self.calcFrequency(ch1);
 
                     if (new_freq <= 0x7FF and ch1.sweep.shift.read() != 0) {
                         ch1.freq.frequency.write(@truncate(u11, new_freq));
-                        this.shadow = @truncate(u11, new_freq);
+                        self.shadow = @truncate(u11, new_freq);
 
-                        _ = this.calcFrequency(ch1);
+                        _ = self.calcFrequency(ch1);
                     }
                 }
             }
         }
 
-        fn calcFrequency(this: *This, ch1: *Self) u12 {
-            const shadow = @as(u12, this.shadow);
+        fn calcFrequency(self: *This, ch1: *Self) u12 {
+            const shadow = @as(u12, self.shadow);
             const shadow_shifted = shadow >> ch1.sweep.shift.read();
             const decrease = ch1.sweep.direction.read();
 

src/core/bus/Bios.zig

@@ -8,27 +8,27 @@ pub const size = 0x4000;
 const Self = @This();
 
 buf: ?[]u8,
-alloc: Allocator,
+allocator: Allocator,
 
 addr_latch: u32,
 
-pub fn init(alloc: Allocator, maybe_path: ?[]const u8) !Self {
+pub fn init(allocator: Allocator, maybe_path: ?[]const u8) !Self {
     const buf: ?[]u8 = if (maybe_path) |path| blk: {
         const file = try std.fs.cwd().openFile(path, .{});
         defer file.close();
 
-        break :blk try file.readToEndAlloc(alloc, try file.getEndPos());
+        break :blk try file.readToEndAlloc(allocator, try file.getEndPos());
     } else null;
 
     return Self{
         .buf = buf,
-        .alloc = alloc,
+        .allocator = allocator,
         .addr_latch = 0,
     };
 }
 
 pub fn deinit(self: *Self) void {
-    if (self.buf) |buf| self.alloc.free(buf);
+    if (self.buf) |buf| self.allocator.free(buf);
     self.* = undefined;
 }
 

src/core/bus/Ewram.zig

@@ -5,20 +5,20 @@ const ewram_size = 0x40000;
 const Self = @This();
 
 buf: []u8,
-alloc: Allocator,
+allocator: Allocator,
 
-pub fn init(alloc: Allocator) !Self {
-    const buf = try alloc.alloc(u8, ewram_size);
+pub fn init(allocator: Allocator) !Self {
+    const buf = try allocator.alloc(u8, ewram_size);
     std.mem.set(u8, buf, 0);
 
     return Self{
         .buf = buf,
-        .alloc = alloc,
+        .allocator = allocator,
     };
 }
 
 pub fn deinit(self: *Self) void {
-    self.alloc.free(self.buf);
+    self.allocator.free(self.buf);
     self.* = undefined;
 }
 

src/core/bus/GamePak.zig

@@ -8,22 +8,22 @@ const Self = @This();
 
 title: [12]u8,
 buf: []u8,
-alloc: Allocator,
+allocator: Allocator,
 backup: Backup,
 
-pub fn init(alloc: Allocator, rom_path: []const u8, save_path: ?[]const u8) !Self {
+pub fn init(allocator: Allocator, rom_path: []const u8, save_path: ?[]const u8) !Self {
     const file = try std.fs.cwd().openFile(rom_path, .{});
     defer file.close();
 
-    const file_buf = try file.readToEndAlloc(alloc, try file.getEndPos());
+    const file_buf = try file.readToEndAlloc(allocator, try file.getEndPos());
     const title = parseTitle(file_buf);
     const kind = Backup.guessKind(file_buf) orelse .None;
 
     const pak = Self{
         .buf = file_buf,
-        .alloc = alloc,
+        .allocator = allocator,
         .title = title,
-        .backup = try Backup.init(alloc, kind, title, save_path),
+        .backup = try Backup.init(allocator, kind, title, save_path),
     };
     pak.parseHeader();
 
@@ -60,7 +60,7 @@ inline fn isLarge(self: *const Self) bool {
 
 pub fn deinit(self: *Self) void {
     self.backup.deinit();
-    self.alloc.free(self.buf);
+    self.allocator.free(self.buf);
     self.* = undefined;
 }
 

src/core/bus/Iwram.zig

@@ -5,20 +5,20 @@ const iwram_size = 0x8000;
 const Self = @This();
 
 buf: []u8,
-alloc: Allocator,
+allocator: Allocator,
 
-pub fn init(alloc: Allocator) !Self {
-    const buf = try alloc.alloc(u8, iwram_size);
+pub fn init(allocator: Allocator) !Self {
+    const buf = try allocator.alloc(u8, iwram_size);
     std.mem.set(u8, buf, 0);
 
     return Self{
         .buf = buf,
-        .alloc = alloc,
+        .allocator = allocator,
     };
 }
 
 pub fn deinit(self: *Self) void {
-    self.alloc.free(self.buf);
+    self.allocator.free(self.buf);
     self.* = undefined;
 }
 

src/core/bus/backup.zig

@@ -17,7 +17,7 @@ pub const Backup = struct {
     const Self = @This();
 
     buf: []u8,
-    alloc: Allocator,
+    allocator: Allocator,
     kind: Kind,
 
     title: [12]u8,
@@ -49,7 +49,7 @@ pub const Backup = struct {
 
         var backup = Self{
             .buf = buf,
-            .alloc = allocator,
+            .allocator = allocator,
             .kind = kind,
             .title = title,
             .save_path = path,
@@ -75,8 +75,8 @@ pub const Backup = struct {
     }
 
     pub fn deinit(self: *Self) void {
-        if (self.save_path) |path| self.writeSaveToDisk(self.alloc, path) catch |e| log.err("Failed to write save: {}", .{e});
-        self.alloc.free(self.buf);
+        if (self.save_path) |path| self.writeSaveToDisk(self.allocator, path) catch |e| log.err("Failed to write save: {}", .{e});
+        self.allocator.free(self.buf);
         self.* = undefined;
     }
 
@@ -310,7 +310,7 @@ const Eeprom = struct {
     writer: Writer,
     reader: Reader,
 
-    alloc: Allocator,
+    allocator: Allocator,
 
     const Kind = enum {
         Unknown,
@@ -326,14 +326,14 @@ const Eeprom = struct {
         RequestEnd,
     };
 
-    fn init(alloc: Allocator) Self {
+    fn init(allocator: Allocator) Self {
         return .{
             .kind = .Unknown,
             .state = .Ready,
             .writer = Writer.init(),
             .reader = Reader.init(),
             .addr = 0,
-            .alloc = alloc,
+            .allocator = allocator,
         };
     }
 
@@ -361,7 +361,7 @@ const Eeprom = struct {
                     else => unreachable,
                 };
 
-                buf.* = self.alloc.alloc(u8, len) catch |e| {
+                buf.* = self.allocator.alloc(u8, len) catch |e| {
                     log.err("Failed to resize EEPROM buf to {} bytes", .{len});
                     std.debug.panic("EEPROM entered irrecoverable state {}", .{e});
                 };

src/core/ppu.zig

@@ -41,7 +41,7 @@ pub const Ppu = struct {
     oam: Oam,
     sched: *Scheduler,
     framebuf: FrameBuffer,
-    alloc: Allocator,
+    allocator: Allocator,
 
     scanline_sprites: *[128]?Sprite,
     scanline: Scanline,
@@ -59,7 +59,7 @@ pub const Ppu = struct {
             .oam = try Oam.init(allocator),
             .sched = sched,
             .framebuf = try FrameBuffer.init(allocator),
-            .alloc = allocator,
+            .allocator = allocator,
 
             // Registers
             .win = Window.init(),
@@ -78,7 +78,7 @@ pub const Ppu = struct {
     }
 
     pub fn deinit(self: *Self) void {
-        self.alloc.destroy(self.scanline_sprites);
+        self.allocator.destroy(self.scanline_sprites);
         self.framebuf.deinit();
         self.scanline.deinit();
         self.vram.deinit();
@@ -628,20 +628,20 @@ const Palette = struct {
     const Self = @This();
 
     buf: []u8,
-    alloc: Allocator,
+    allocator: Allocator,
 
-    fn init(alloc: Allocator) !Self {
-        const buf = try alloc.alloc(u8, palram_size);
+    fn init(allocator: Allocator) !Self {
+        const buf = try allocator.alloc(u8, palram_size);
         std.mem.set(u8, buf, 0);
 
         return Self{
             .buf = buf,
-            .alloc = alloc,
+            .allocator = allocator,
         };
     }
 
     fn deinit(self: *Self) void {
-        self.alloc.free(self.buf);
+        self.allocator.free(self.buf);
         self.* = undefined;
     }
 
@@ -677,20 +677,20 @@ const Vram = struct {
     const Self = @This();
 
     buf: []u8,
-    alloc: Allocator,
+    allocator: Allocator,
 
-    fn init(alloc: Allocator) !Self {
-        const buf = try alloc.alloc(u8, vram_size);
+    fn init(allocator: Allocator) !Self {
+        const buf = try allocator.alloc(u8, vram_size);
         std.mem.set(u8, buf, 0);
 
         return Self{
             .buf = buf,
-            .alloc = alloc,
+            .allocator = allocator,
         };
     }
 
     fn deinit(self: *Self) void {
-        self.alloc.free(self.buf);
+        self.allocator.free(self.buf);
         self.* = undefined;
     }
 
@@ -738,20 +738,20 @@ const Oam = struct {
     const Self = @This();
 
     buf: []u8,
-    alloc: Allocator,
+    allocator: Allocator,
 
-    fn init(alloc: Allocator) !Self {
-        const buf = try alloc.alloc(u8, oam_size);
+    fn init(allocator: Allocator) !Self {
+        const buf = try allocator.alloc(u8, oam_size);
         std.mem.set(u8, buf, 0);
 
         return Self{
             .buf = buf,
-            .alloc = alloc,
+            .allocator = allocator,
         };
     }
 
     fn deinit(self: *Self) void {
-        self.alloc.free(self.buf);
+        self.allocator.free(self.buf);
         self.* = undefined;
     }
 

src/core/scheduler.zig

@@ -14,8 +14,8 @@ pub const Scheduler = struct {
     tick: u64,
     queue: PriorityQueue(Event, void, lessThan),
 
-    pub fn init(alloc: Allocator) Self {
-        var sched = Self{ .tick = 0, .queue = PriorityQueue(Event, void, lessThan).init(alloc, {}) };
+    pub fn init(allocator: Allocator) Self {
+        var sched = Self{ .tick = 0, .queue = PriorityQueue(Event, void, lessThan).init(allocator, {}) };
         sched.queue.add(.{ .kind = .HeatDeath, .tick = std.math.maxInt(u64) }) catch unreachable;
 
         return sched;

src/core/util.zig

@@ -129,45 +129,45 @@ pub const Logger = struct {
         try self.buf.writer().print(format, args);
     }
 
-    pub fn mgbaLog(self: *Self, arm7tdmi: *const Arm7tdmi, opcode: u32) void {
+    pub fn mgbaLog(self: *Self, cpu: *const Arm7tdmi, opcode: u32) void {
         const fmt_base = "{X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} cpsr: {X:0>8} | ";
         const thumb_fmt = fmt_base ++ "{X:0>4}:\n";
         const arm_fmt = fmt_base ++ "{X:0>8}:\n";
 
-        if (arm7tdmi.cpsr.t.read()) {
+        if (cpu.cpsr.t.read()) {
             if (opcode >> 11 == 0x1E) {
                 // Instruction 1 of a BL Opcode, print in ARM mode
-                const low = arm7tdmi.bus.dbgRead(u16, arm7tdmi.r[15]);
+                const low = cpu.bus.dbgRead(u16, cpu.r[15]);
                 const bl_opcode = @as(u32, opcode) << 16 | low;
 
-                self.print(arm_fmt, Self.fmtArgs(arm7tdmi, bl_opcode)) catch @panic("failed to write to log file");
+                self.print(arm_fmt, Self.fmtArgs(cpu, bl_opcode)) catch @panic("failed to write to log file");
             } else {
-                self.print(thumb_fmt, Self.fmtArgs(arm7tdmi, opcode)) catch @panic("failed to write to log file");
+                self.print(thumb_fmt, Self.fmtArgs(cpu, opcode)) catch @panic("failed to write to log file");
             }
         } else {
-            self.print(arm_fmt, Self.fmtArgs(arm7tdmi, opcode)) catch @panic("failed to write to log file");
+            self.print(arm_fmt, Self.fmtArgs(cpu, opcode)) catch @panic("failed to write to log file");
         }
     }
 
-    fn fmtArgs(arm7tdmi: *const Arm7tdmi, opcode: u32) FmtArgTuple {
+    fn fmtArgs(cpu: *const Arm7tdmi, opcode: u32) FmtArgTuple {
         return .{
-            arm7tdmi.r[0],
-            arm7tdmi.r[1],
-            arm7tdmi.r[2],
-            arm7tdmi.r[3],
-            arm7tdmi.r[4],
-            arm7tdmi.r[5],
-            arm7tdmi.r[6],
-            arm7tdmi.r[7],
-            arm7tdmi.r[8],
-            arm7tdmi.r[9],
-            arm7tdmi.r[10],
-            arm7tdmi.r[11],
-            arm7tdmi.r[12],
-            arm7tdmi.r[13],
-            arm7tdmi.r[14],
-            arm7tdmi.r[15],
-            arm7tdmi.cpsr.raw,
+            cpu.r[0],
+            cpu.r[1],
+            cpu.r[2],
+            cpu.r[3],
+            cpu.r[4],
+            cpu.r[5],
+            cpu.r[6],
+            cpu.r[7],
+            cpu.r[8],
+            cpu.r[9],
+            cpu.r[10],
+            cpu.r[11],
+            cpu.r[12],
+            cpu.r[13],
+            cpu.r[14],
+            cpu.r[15],
+            cpu.cpsr.raw,
             opcode,
         };
     }

src/main.zig

@@ -14,7 +14,7 @@ const Allocator = std.mem.Allocator;
 const log = std.log.scoped(.CLI);
 const width = @import("core/ppu.zig").width;
 const height = @import("core/ppu.zig").height;
-const arm7tdmi_logging = @import("core/emu.zig").cpu_logging;
+const cpu_logging = @import("core/emu.zig").cpu_logging;
 pub const log_level = if (builtin.mode != .Debug) .info else std.log.default_level;
 
 // TODO: Reimpl Logging
@@ -40,7 +40,7 @@ pub fn main() anyerror!void {
     const paths = try handleArguments(allocator, &result);
     defer if (paths.save) |path| allocator.free(path);
 
-    const log_file: ?std.fs.File = if (arm7tdmi_logging) try std.fs.cwd().createFile("zba.log", .{}) else null;
+    const log_file: ?std.fs.File = if (cpu_logging) try std.fs.cwd().createFile("zba.log", .{}) else null;
     defer if (log_file) |file| file.close();
 
     // TODO: Take Emulator Init Code out of main.zig
@@ -48,17 +48,17 @@ pub fn main() anyerror!void {
     defer scheduler.deinit();
 
     var bus: Bus = undefined;
-    var arm7tdmi = Arm7tdmi.init(&scheduler, &bus, log_file);
-    if (paths.bios == null) arm7tdmi.fastBoot();
+    var cpu = Arm7tdmi.init(&scheduler, &bus, log_file);
+    if (paths.bios == null) cpu.fastBoot();
 
-    try bus.init(allocator, &scheduler, &arm7tdmi, paths);
+    try bus.init(allocator, &scheduler, &cpu, paths);
     defer bus.deinit();
 
     var gui = Gui.init(bus.pak.title, width, height);
     gui.initAudio(&bus.apu);
     defer gui.deinit();
 
-    try gui.run(&arm7tdmi, &scheduler);
+    try gui.run(&cpu, &scheduler);
 }
 
 fn getSavePath(allocator: Allocator) !?[]const u8 {