src/Gui.zig

@@ -136,13 +136,12 @@ pub fn initAudio(self: *Self, apu: *Apu) void {
     self.audio.?.play();
 }
 
-pub fn deinit(self: *Self) void {
-    if (self.audio) |*aud| aud.deinit();
+pub fn deinit(self: Self) void {
+    if (self.audio) |aud| aud.deinit();
     SDL.SDL_DestroyTexture(self.texture);
     SDL.SDL_DestroyRenderer(self.renderer);
     SDL.SDL_DestroyWindow(self.window);
     SDL.SDL_Quit();
-    self.* = undefined;
 }
 
 const Audio = struct {
@@ -169,9 +168,8 @@ const Audio = struct {
         };
     }
 
-    fn deinit(self: *This) void {
-        SDL.SDL_CloseAudioDevice(self.device);
-        self.* = undefined;
+    fn deinit(this: This) void {
+        SDL.SDL_CloseAudioDevice(this.device);
     }
 
     pub fn play(this: *This) void {

src/core/Bus.zig

@@ -49,8 +49,8 @@ io: Io,
 cpu: ?*Arm7tdmi,
 sched: *Scheduler,
 
-pub fn init(self: *Self, alloc: Allocator, sched: *Scheduler, cpu: *Arm7tdmi, paths: FilePaths) !void {
-    self.* = .{
+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),
@@ -60,34 +60,21 @@ pub fn init(self: *Self, alloc: Allocator, sched: *Scheduler, cpu: *Arm7tdmi, pa
         .dma = createDmaTuple(),
         .tim = createTimerTuple(sched),
         .io = Io.init(),
-        .cpu = cpu,
+        .cpu = null,
         .sched = sched,
     };
 }
 
-// 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 {
+pub fn deinit(self: Self) void {
     self.iwram.deinit();
     self.ewram.deinit();
     self.pak.deinit();
     self.bios.deinit();
     self.ppu.deinit();
-    self.* = undefined;
+}
+
+pub fn attach(self: *Self, cpu: *Arm7tdmi) void {
+    self.cpu = cpu;
 }
 
 pub fn dbgRead(self: *const Self, comptime T: type, address: u32) T {

src/core/bus/Bios.zig

@@ -27,9 +27,8 @@ pub fn init(alloc: Allocator, maybe_path: ?[]const u8) !Self {
     };
 }
 
-pub fn deinit(self: *Self) void {
+pub fn deinit(self: Self) void {
     if (self.buf) |buf| self.alloc.free(buf);
-    self.* = undefined;
 }
 
 pub fn read(self: *Self, comptime T: type, r15: u32, addr: u32) T {

src/core/bus/Ewram.zig

@@ -17,9 +17,8 @@ pub fn init(alloc: Allocator) !Self {
     };
 }
 
-pub fn deinit(self: *Self) void {
+pub fn deinit(self: Self) void {
     self.alloc.free(self.buf);
-    self.* = undefined;
 }
 
 pub fn read(self: *const Self, comptime T: type, address: usize) T {

src/core/bus/GamePak.zig

@@ -58,10 +58,9 @@ inline fn isLarge(self: *const Self) bool {
     return self.buf.len > 0x100_0000;
 }
 
-pub fn deinit(self: *Self) void {
-    self.backup.deinit();
+pub fn deinit(self: Self) void {
     self.alloc.free(self.buf);
-    self.* = undefined;
+    self.backup.deinit();
 }
 
 pub fn read(self: *Self, comptime T: type, address: u32) T {

src/core/bus/Iwram.zig

@@ -17,9 +17,8 @@ pub fn init(alloc: Allocator) !Self {
     };
 }
 
-pub fn deinit(self: *Self) void {
+pub fn deinit(self: Self) void {
     self.alloc.free(self.buf);
-    self.* = undefined;
 }
 
 pub fn read(self: *const Self, comptime T: type, address: usize) T {

src/core/bus/backup.zig

@@ -74,10 +74,9 @@ pub const Backup = struct {
         return null;
     }
 
-    pub fn deinit(self: *Self) void {
+    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);
-        self.* = undefined;
     }
 
     fn loadSaveFromDisk(self: *Self, allocator: Allocator, path: []const u8) !void {

src/core/cpu.zig

@@ -250,7 +250,7 @@ pub const Arm7tdmi = struct {
 
     logger: ?Logger,
 
-    pub fn init(sched: *Scheduler, bus: *Bus, log_file: ?std.fs.File) Self {
+    pub fn init(sched: *Scheduler, bus: *Bus) Self {
         return Self{
             .r = [_]u32{0x00} ** 16,
             .sched = sched,
@@ -260,10 +260,14 @@ pub const Arm7tdmi = struct {
             .banked_fiq = [_]u32{0x00} ** 10,
             .banked_r = [_]u32{0x00} ** 12,
             .banked_spsr = [_]PSR{.{ .raw = 0x0000_0000 }} ** 5,
-            .logger = if (log_file) |file| Logger.init(file) else null,
+            .logger = null,
         };
     }
 
+    pub fn attach(self: *Self, log_file: std.fs.File) void {
+        self.logger = Logger.init(log_file);
+    }
+
     inline fn bankedIdx(mode: Mode, kind: BankedKind) usize {
         const idx: usize = switch (mode) {
             .User, .System => 0,

src/core/ppu.zig

@@ -43,23 +43,26 @@ pub const Ppu = struct {
     framebuf: FrameBuffer,
     alloc: Allocator,
 
-    scanline_sprites: *[128]?Sprite,
+    scanline_sprites: [128]?Sprite,
     scanline: Scanline,
 
-    pub fn init(allocator: Allocator, sched: *Scheduler) !Self {
+    pub fn init(alloc: Allocator, sched: *Scheduler) !Self {
         // Queue first Hblank
         sched.push(.Draw, 240 * 4);
 
-        const sprites = try allocator.create([128]?Sprite);
-        sprites.* = [_]?Sprite{null} ** 128;
+        const framebufs = try alloc.alloc(u8, (framebuf_pitch * height) * 2);
+        std.mem.set(u8, framebufs, 0);
+
+        const scanline_buf = try alloc.alloc(?u16, width * 2);
+        std.mem.set(?u16, scanline_buf, null);
 
         return Self{
-            .vram = try Vram.init(allocator),
-            .palette = try Palette.init(allocator),
-            .oam = try Oam.init(allocator),
+            .vram = try Vram.init(alloc),
+            .palette = try Palette.init(alloc),
+            .oam = try Oam.init(alloc),
             .sched = sched,
-            .framebuf = try FrameBuffer.init(allocator),
-            .alloc = allocator,
+            .framebuf = FrameBuffer.init(framebufs),
+            .alloc = alloc,
 
             // Registers
             .win = Window.init(),
@@ -72,19 +75,17 @@ pub const Ppu = struct {
             .bldalpha = .{ .raw = 0x0000 },
             .bldy = .{ .raw = 0x0000 },
 
-            .scanline = try Scanline.init(allocator),
-            .scanline_sprites = sprites,
+            .scanline = Scanline.init(scanline_buf),
+            .scanline_sprites = [_]?Sprite{null} ** 128,
         };
     }
 
-    pub fn deinit(self: *Self) void {
-        self.alloc.destroy(self.scanline_sprites);
-        self.framebuf.deinit();
-        self.scanline.deinit();
+    pub fn deinit(self: Self) void {
+        self.framebuf.deinit(self.alloc);
+        self.scanline.deinit(self.alloc);
         self.vram.deinit();
         self.palette.deinit();
         self.oam.deinit();
-        self.* = undefined;
     }
 
     pub fn setBgOffsets(self: *Self, comptime n: u2, word: u32) void {
@@ -398,7 +399,7 @@ pub const Ppu = struct {
                 // Reset Current Scanline Pixel Buffer and list of fetched sprites
                 // in prep for next scanline
                 self.scanline.reset();
-                std.mem.set(?Sprite, self.scanline_sprites, null);
+                std.mem.set(?Sprite, &self.scanline_sprites, null);
             },
             0x1 => {
                 const fb_base = framebuf_pitch * @as(usize, scanline);
@@ -425,7 +426,7 @@ pub const Ppu = struct {
                 // Reset Current Scanline Pixel Buffer and list of fetched sprites
                 // in prep for next scanline
                 self.scanline.reset();
-                std.mem.set(?Sprite, self.scanline_sprites, null);
+                std.mem.set(?Sprite, &self.scanline_sprites, null);
             },
             0x2 => {
                 const fb_base = framebuf_pitch * @as(usize, scanline);
@@ -451,7 +452,7 @@ pub const Ppu = struct {
                 // Reset Current Scanline Pixel Buffer and list of fetched sprites
                 // in prep for next scanline
                 self.scanline.reset();
-                std.mem.set(?Sprite, self.scanline_sprites, null);
+                std.mem.set(?Sprite, &self.scanline_sprites, null);
             },
             0x3 => {
                 const vram_base = width * @sizeOf(u16) * @as(usize, scanline);
@@ -640,9 +641,8 @@ const Palette = struct {
         };
     }
 
-    fn deinit(self: *Self) void {
+    fn deinit(self: Self) void {
         self.alloc.free(self.buf);
-        self.* = undefined;
     }
 
     pub fn read(self: *const Self, comptime T: type, address: usize) T {
@@ -689,9 +689,8 @@ const Vram = struct {
         };
     }
 
-    fn deinit(self: *Self) void {
+    fn deinit(self: Self) void {
         self.alloc.free(self.buf);
-        self.* = undefined;
     }
 
     pub fn read(self: *const Self, comptime T: type, address: usize) T {
@@ -750,9 +749,8 @@ const Oam = struct {
         };
     }
 
-    fn deinit(self: *Self) void {
+    fn deinit(self: Self) void {
         self.alloc.free(self.buf);
-        self.* = undefined;
     }
 
     pub fn read(self: *const Self, comptime T: type, address: usize) T {
@@ -1215,38 +1213,35 @@ fn copyToSpriteBuffer(bldcnt: io.BldCnt, scanline: *Scanline, x: u9, bgr555: u16
 const Scanline = struct {
     const Self = @This();
 
-    layers: [2][]?u16,
-    buf: []?u16,
+    buf: [2][]?u16,
+    original: []?u16,
 
-    allocator: Allocator,
+    fn init(buf: []?u16) Self {
+        std.debug.assert(buf.len == width * 2);
 
-    fn init(allocator: Allocator) !Self {
-        const buf = try allocator.alloc(?u16, width * 2); // Top & Bottom Scanline
-        std.mem.set(?u16, buf, null);
+        const top_slice = buf[0..][0..width];
+        const btm_slice = buf[width..][0..width];
 
         return .{
-            // Top & Bototm Layers
-            .layers = [_][]?u16{ buf[0..][0..width], buf[width..][0..width] },
-            .buf = buf,
-            .allocator = allocator,
+            .buf = [_][]?u16{ top_slice, btm_slice },
+            .original = buf,
         };
     }
 
     fn reset(self: *Self) void {
-        std.mem.set(?u16, self.buf, null);
+        std.mem.set(?u16, self.original, null);
     }
 
-    fn deinit(self: *Self) void {
-        self.allocator.free(self.buf);
-        self.* = undefined;
+    fn deinit(self: Self, alloc: Allocator) void {
+        alloc.free(self.original);
     }
 
     fn top(self: *Self) []?u16 {
-        return self.layers[0];
+        return self.buf[0];
     }
 
     fn btm(self: *Self) []?u16 {
-        return self.layers[1];
+        return self.buf[1];
     }
 };
 
@@ -1254,36 +1249,31 @@ const Scanline = struct {
 const FrameBuffer = struct {
     const Self = @This();
 
-    layers: [2][]u8,
-    buf: []u8,
+    buf: [2][]u8,
+    original: []u8,
     current: u1,
 
-    allocator: Allocator,
-
     // TODO: Rename
     const Device = enum {
         Emulator,
         Renderer,
     };
 
-    pub fn init(allocator: Allocator) !Self {
-        const framebuf_len = framebuf_pitch * height;
-        const buf = try allocator.alloc(u8, framebuf_len * 2);
-        std.mem.set(u8, buf, 0);
+    pub fn init(bufs: []u8) Self {
+        std.debug.assert(bufs.len == framebuf_pitch * height * 2);
+
+        const front = bufs[0 .. framebuf_pitch * height];
+        const back = bufs[framebuf_pitch * height ..];
 
         return .{
-            // Front and Back Framebuffers
-            .layers = [_][]u8{ buf[0..][0..framebuf_len], buf[framebuf_len..][0..framebuf_len] },
-            .buf = buf,
+            .buf = [2][]u8{ front, back },
+            .original = bufs,
             .current = 0,
-
-            .allocator = allocator,
         };
     }
 
-    fn deinit(self: *Self) void {
-        self.allocator.free(self.buf);
-        self.* = undefined;
+    fn deinit(self: Self, alloc: Allocator) void {
+        alloc.free(self.original);
     }
 
     pub fn swap(self: *Self) void {
@@ -1291,6 +1281,6 @@ const FrameBuffer = struct {
     }
 
     pub fn get(self: *Self, comptime dev: Device) []u8 {
-        return self.layers[if (dev == .Emulator) self.current else ~self.current];
+        return self.buf[if (dev == .Emulator) self.current else ~self.current];
     }
 };

src/core/scheduler.zig

@@ -21,9 +21,8 @@ pub const Scheduler = struct {
         return sched;
     }
 
-    pub fn deinit(self: *Self) void {
+    pub fn deinit(self: Self) void {
         self.queue.deinit();
-        self.* = undefined;
     }
 
     pub inline fn now(self: *const Self) u64 {

src/main.zig

@@ -40,20 +40,22 @@ 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;
-    defer if (log_file) |file| file.close();
-
     // TODO: Take Emulator Init Code out of main.zig
     var scheduler = Scheduler.init(allocator);
     defer scheduler.deinit();
 
-    var bus: Bus = undefined;
-    var arm7tdmi = Arm7tdmi.init(&scheduler, &bus, log_file);
-    if (paths.bios == null) arm7tdmi.fastBoot();
-
-    try bus.init(allocator, &scheduler, &arm7tdmi, paths);
+    var bus = try Bus.init(allocator, &scheduler, paths);
     defer bus.deinit();
 
+    var arm7tdmi = Arm7tdmi.init(&scheduler, &bus);
+
+    const log_file: ?std.fs.File = if (arm7tdmi_logging) try std.fs.cwd().createFile("zba.log", .{}) else null;
+    defer if (log_file) |file| file.close();
+
+    if (log_file) |file| arm7tdmi.attach(file);
+    bus.attach(&arm7tdmi); // TODO: Shrink Surface (only CPSR and  r15?)
+    if (paths.bios == null) arm7tdmi.fastBoot();
+
     var gui = Gui.init(bus.pak.title, width, height);
     gui.initAudio(&bus.apu);
     defer gui.deinit();