chore: rename arm7tdmi variables to just cpu

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("PC: 0x{X:0>8}", .{cpu.r[15]});
-                            log.info("LR: 0x{X:0>8}", .{arm7tdmi.r[14]});
+                            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 {
+    pub fn play(self: *This) void {
-        SDL.SDL_PauseAudioDevice(this.device, 0);
+        SDL.SDL_PauseAudioDevice(self.device, 0);
     }
 
     export fn callback(userdata: ?*anyopaque, stream: [*c]u8, len: c_int) void {

src/core/apu.zig

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

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],
+            cpu.r[0],
-            arm7tdmi.r[1],
+            cpu.r[1],
-            arm7tdmi.r[2],
+            cpu.r[2],
-            arm7tdmi.r[3],
+            cpu.r[3],
-            arm7tdmi.r[4],
+            cpu.r[4],
-            arm7tdmi.r[5],
+            cpu.r[5],
-            arm7tdmi.r[6],
+            cpu.r[6],
-            arm7tdmi.r[7],
+            cpu.r[7],
-            arm7tdmi.r[8],
+            cpu.r[8],
-            arm7tdmi.r[9],
+            cpu.r[9],
-            arm7tdmi.r[10],
+            cpu.r[10],
-            arm7tdmi.r[11],
+            cpu.r[11],
-            arm7tdmi.r[12],
+            cpu.r[12],
-            arm7tdmi.r[13],
+            cpu.r[13],
-            arm7tdmi.r[14],
+            cpu.r[14],
-            arm7tdmi.r[15],
+            cpu.r[15],
-            arm7tdmi.cpsr.raw,
+            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);
+    var cpu = Arm7tdmi.init(&scheduler, &bus, log_file);
-    if (paths.bios == null) arm7tdmi.fastBoot();
+    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 {