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fbe3de0eb3
| Author | SHA1 | Date |
|---|---|---|
 Rekai Nyangadzayi Musuka
|
fbe3de0eb3 | |
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Rekai Nyangadzayi Musuka
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4af144fca2 | |
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Rekai Nyangadzayi Musuka
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9a8aaba1ab | |
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Rekai Nyangadzayi Musuka
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fa3b9c21b9 |
194
src/Gui.zig
194
src/Gui.zig
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@ -1,194 +0,0 @@
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const std = @import("std");
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const SDL = @import("sdl2");
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const Self = @This();
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const Apu = @import("core/apu.zig").Apu;
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const Arm7tdmi = @import("core/cpu.zig").Arm7tdmi;
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const Scheduler = @import("core/scheduler.zig").Scheduler;
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const FpsTracker = @import("core/util.zig").FpsTracker;
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const pitch = @import("core/ppu.zig").framebuf_pitch;
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const scale = @import("core/emu.zig").win_scale;
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const emu = @import("core/emu.zig");
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const log = std.log.scoped(.GUI);
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const default_title: []const u8 = "ZBA";
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window: *SDL.SDL_Window,
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base_title: [12]u8,
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renderer: *SDL.SDL_Renderer,
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texture: *SDL.SDL_Texture,
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audio: ?Audio,
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pub fn init(title: [12]u8, width: i32, height: i32) Self {
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const ret = SDL.SDL_Init(SDL.SDL_INIT_VIDEO | SDL.SDL_INIT_EVENTS | SDL.SDL_INIT_AUDIO | SDL.SDL_INIT_GAMECONTROLLER);
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if (ret < 0) panic();
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const window = SDL.SDL_CreateWindow(
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default_title.ptr,
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SDL.SDL_WINDOWPOS_CENTERED,
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SDL.SDL_WINDOWPOS_CENTERED,
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@as(c_int, width * scale),
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@as(c_int, height * scale),
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SDL.SDL_WINDOW_SHOWN,
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) orelse panic();
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const renderer = SDL.SDL_CreateRenderer(window, -1, SDL.SDL_RENDERER_ACCELERATED | SDL.SDL_RENDERER_PRESENTVSYNC) orelse panic();
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const texture = SDL.SDL_CreateTexture(
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renderer,
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SDL.SDL_PIXELFORMAT_RGBA8888,
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SDL.SDL_TEXTUREACCESS_STREAMING,
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@as(c_int, width),
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@as(c_int, height),
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) orelse panic();
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return Self{
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.window = window,
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.base_title = title,
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.renderer = renderer,
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.texture = texture,
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.audio = null,
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};
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}
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pub fn run(self: *Self, cpu: *Arm7tdmi, scheduler: *Scheduler) !void {
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var quit = std.atomic.Atomic(bool).init(false);
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var frame_rate = FpsTracker.init();
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const thread = try std.Thread.spawn(.{}, emu.run, .{ &quit, &frame_rate, scheduler, cpu });
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defer thread.join();
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var title_buf: [0x100]u8 = [_]u8{0} ** 0x100;
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emu_loop: while (true) {
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var event: SDL.SDL_Event = undefined;
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while (SDL.SDL_PollEvent(&event) != 0) {
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switch (event.type) {
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SDL.SDL_QUIT => break :emu_loop,
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SDL.SDL_KEYDOWN => {
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const io = &cpu.bus.io;
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const key_code = event.key.keysym.sym;
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switch (key_code) {
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SDL.SDLK_UP => io.keyinput.up.unset(),
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SDL.SDLK_DOWN => io.keyinput.down.unset(),
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SDL.SDLK_LEFT => io.keyinput.left.unset(),
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SDL.SDLK_RIGHT => io.keyinput.right.unset(),
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SDL.SDLK_x => io.keyinput.a.unset(),
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SDL.SDLK_z => io.keyinput.b.unset(),
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SDL.SDLK_a => io.keyinput.shoulder_l.unset(),
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SDL.SDLK_s => io.keyinput.shoulder_r.unset(),
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SDL.SDLK_RETURN => io.keyinput.start.unset(),
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SDL.SDLK_RSHIFT => io.keyinput.select.unset(),
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else => {},
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}
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},
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SDL.SDL_KEYUP => {
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const io = &cpu.bus.io;
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const key_code = event.key.keysym.sym;
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switch (key_code) {
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SDL.SDLK_UP => io.keyinput.up.set(),
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SDL.SDLK_DOWN => io.keyinput.down.set(),
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SDL.SDLK_LEFT => io.keyinput.left.set(),
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SDL.SDLK_RIGHT => io.keyinput.right.set(),
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SDL.SDLK_x => io.keyinput.a.set(),
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SDL.SDLK_z => io.keyinput.b.set(),
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SDL.SDLK_a => io.keyinput.shoulder_l.set(),
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SDL.SDLK_s => io.keyinput.shoulder_r.set(),
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SDL.SDLK_RETURN => io.keyinput.start.set(),
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SDL.SDLK_RSHIFT => io.keyinput.select.set(),
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SDL.SDLK_i => log.err("Sample Count: {}", .{@intCast(u32, SDL.SDL_AudioStreamAvailable(cpu.bus.apu.stream)) / (2 * @sizeOf(u16))}),
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SDL.SDLK_j => log.err("Scheduler Capacity: {} | Scheduler Event Count: {}", .{ scheduler.queue.capacity(), scheduler.queue.count() }),
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SDL.SDLK_k => {
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// Dump IWRAM to file
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log.info("PC: 0x{X:0>8}", .{cpu.r[15]});
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log.info("LR: 0x{X:0>8}", .{cpu.r[14]});
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// const iwram_file = try std.fs.cwd().createFile("iwram.bin", .{});
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// defer iwram_file.close();
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// try iwram_file.writeAll(cpu.bus.iwram.buf);
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},
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else => {},
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}
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},
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else => {},
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}
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}
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// Emulator has an internal Double Buffer
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const framebuf = cpu.bus.ppu.framebuf.get(.Renderer);
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_ = SDL.SDL_UpdateTexture(self.texture, null, framebuf.ptr, pitch);
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_ = SDL.SDL_RenderCopy(self.renderer, self.texture, null, null);
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SDL.SDL_RenderPresent(self.renderer);
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const title = std.fmt.bufPrint(&title_buf, "ZBA | {s} [Emu: {}fps] ", .{ self.base_title, frame_rate.value() }) catch unreachable;
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SDL.SDL_SetWindowTitle(self.window, title.ptr);
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}
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quit.store(true, .SeqCst); // Terminate Emulator Thread
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}
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pub fn initAudio(self: *Self, apu: *Apu) void {
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self.audio = Audio.init(apu);
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self.audio.?.play();
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}
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pub fn deinit(self: *Self) void {
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if (self.audio) |*aud| aud.deinit();
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SDL.SDL_DestroyTexture(self.texture);
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SDL.SDL_DestroyRenderer(self.renderer);
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SDL.SDL_DestroyWindow(self.window);
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SDL.SDL_Quit();
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self.* = undefined;
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}
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const Audio = struct {
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const This = @This();
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const sample_rate = @import("core/apu.zig").host_sample_rate;
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device: SDL.SDL_AudioDeviceID,
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fn init(apu: *Apu) This {
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var have: SDL.SDL_AudioSpec = undefined;
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var want: SDL.SDL_AudioSpec = std.mem.zeroes(SDL.SDL_AudioSpec);
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want.freq = sample_rate;
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want.format = SDL.AUDIO_U16;
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want.channels = 2;
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want.samples = 0x100;
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want.callback = This.callback;
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want.userdata = apu;
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const device = SDL.SDL_OpenAudioDevice(null, 0, &want, &have, 0);
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if (device == 0) panic();
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return .{
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.device = device,
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};
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}
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fn deinit(self: *This) void {
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SDL.SDL_CloseAudioDevice(self.device);
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self.* = undefined;
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}
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pub fn play(self: *This) void {
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SDL.SDL_PauseAudioDevice(self.device, 0);
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}
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export fn callback(userdata: ?*anyopaque, stream: [*c]u8, len: c_int) void {
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const apu = @ptrCast(*Apu, @alignCast(@alignOf(*Apu), userdata));
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_ = SDL.SDL_AudioStreamGet(apu.stream, stream, len);
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// If we don't write anything, play silence otherwise garbage will be played
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// FIXME: I don't think this hack to remove DC Offset is acceptable :thinking:
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// if (written == 0) std.mem.set(u8, stream[0..@intCast(usize, len)], 0x40);
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}
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};
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fn panic() noreturn {
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const str = @as(?[*:0]const u8, SDL.SDL_GetError()) orelse "unknown error";
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@panic(std.mem.sliceTo(str, 0));
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}
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@ -1,10 +1,11 @@
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const std = @import("std");
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const Bit = @import("bitfield").Bit;
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const Bitfield = @import("bitfield").Bitfield;
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const DateTime = @import("datetime").datetime.Datetime;
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const Arm7tdmi = @import("../cpu.zig").Arm7tdmi;
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const Bit = @import("bitfield").Bit;
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const Bitfield = @import("bitfield").Bitfield;
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const Backup = @import("backup.zig").Backup;
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const Gpio = @import("gpio.zig").Gpio;
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const Allocator = std.mem.Allocator;
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const force_rtc = @import("../emu.zig").force_rtc;
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@ -239,463 +240,3 @@ test "OOB Access" {
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std.debug.assert(pak.get(4) == 0x02); // 0x0002
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std.debug.assert(pak.get(5) == 0x00);
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}
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/// GPIO Register Implementation
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const Gpio = struct {
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const This = @This();
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data: u4,
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direction: u4,
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cnt: u1,
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device: Device,
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const Device = struct {
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ptr: ?*anyopaque,
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kind: Kind, // TODO: Make comptime known?
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const Kind = enum { Rtc, None };
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fn step(self: *Device, value: u4) u4 {
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return switch (self.kind) {
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.Rtc => blk: {
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const clock = @ptrCast(*Clock, @alignCast(@alignOf(*Clock), self.ptr.?));
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break :blk clock.step(Clock.Data{ .raw = value });
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},
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.None => value,
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};
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}
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fn init(kind: Kind, ptr: ?*anyopaque) Device {
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return .{ .kind = kind, .ptr = ptr };
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}
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};
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const Register = enum {
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Data,
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Direction,
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Control,
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};
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fn init(allocator: Allocator, cpu: *Arm7tdmi, kind: Device.Kind) !*This {
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log.info("Device: {}", .{kind});
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const self = try allocator.create(This);
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self.* = .{
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.data = 0b0000,
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.direction = 0b1111, // TODO: What is GPIO DIrection set to by default?
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.cnt = 0b0,
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.device = switch (kind) {
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.Rtc => blk: {
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const clock = try allocator.create(Clock);
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clock.init(cpu, self);
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break :blk Device{ .kind = kind, .ptr = clock };
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},
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.None => Device{ .kind = kind, .ptr = null },
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},
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};
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return self;
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}
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fn deinit(self: *This, allocator: Allocator) void {
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switch (self.device.kind) {
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.Rtc => {
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allocator.destroy(@ptrCast(*Clock, @alignCast(@alignOf(*Clock), self.device.ptr.?)));
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},
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.None => {},
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}
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self.* = undefined;
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}
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fn write(self: *This, comptime reg: Register, value: if (reg == .Control) u1 else u4) void {
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switch (reg) {
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.Data => {
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const masked_value = value & self.direction;
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// The value which is actually stored in the GPIO register
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// might be modified by the device implementing the GPIO interface e.g. RTC reads
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self.data = self.device.step(masked_value);
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},
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.Direction => self.direction = value,
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.Control => self.cnt = value,
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}
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}
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fn read(self: *const This, comptime reg: Register) if (reg == .Control) u1 else u4 {
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if (self.cnt == 0) return 0;
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return switch (reg) {
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.Data => self.data & ~self.direction,
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.Direction => self.direction,
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.Control => self.cnt,
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};
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}
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};
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/// GBA Real Time Clock
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pub const Clock = struct {
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const This = @This();
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writer: Writer,
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reader: Reader,
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state: State,
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cnt: Control,
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year: u8,
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month: u5,
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day: u6,
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weekday: u3,
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hour: u6,
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minute: u7,
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second: u7,
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cpu: *Arm7tdmi,
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gpio: *const Gpio,
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const Register = enum {
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Control,
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DateTime,
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Time,
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};
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const State = union(enum) {
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Idle,
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Command,
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Write: Register,
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Read: Register,
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};
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const Reader = struct {
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i: u4,
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count: u8,
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/// Reads a bit from RTC registers. Which bit it reads is dependent on
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///
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/// 1. The RTC State Machine, whitch tells us which register we're accessing
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/// 2. A `count`, which keeps track of which byte is currently being read
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/// 3. An index, which keeps track of which bit of the byte determined by `count` is being read
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fn read(self: *Reader, clock: *const Clock, register: Register) u1 {
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const idx = @intCast(u3, self.i);
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defer self.i += 1;
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// FIXME: What do I do about the unused bits?
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return switch (register) {
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.Control => @truncate(u1, switch (self.count) {
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0 => clock.cnt.raw >> idx,
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else => std.debug.panic("Tried to read from byte #{} of {} (hint: there's only 1 byte)", .{ self.count, register }),
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}),
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.DateTime => @truncate(u1, switch (self.count) {
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// Date
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0 => clock.year >> idx,
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1 => @as(u8, clock.month) >> idx,
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2 => @as(u8, clock.day) >> idx,
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3 => @as(u8, clock.weekday) >> idx,
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// Time
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4 => @as(u8, clock.hour) >> idx,
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5 => @as(u8, clock.minute) >> idx,
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6 => @as(u8, clock.second) >> idx,
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else => std.debug.panic("Tried to read from byte #{} of {} (hint: there's only 7 bytes)", .{ self.count, register }),
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}),
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.Time => @truncate(u1, switch (self.count) {
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0 => @as(u8, clock.hour) >> idx,
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1 => @as(u8, clock.minute) >> idx,
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2 => @as(u8, clock.second) >> idx,
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else => std.debug.panic("Tried to read from byte #{} of {} (hint: there's only 3 bytes)", .{ self.count, register }),
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}),
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};
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}
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/// Is true when a Reader has read a u8's worth of bits
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fn finished(self: *const Reader) bool {
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return self.i >= 8;
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}
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/// Resets the index used to shift bits out of RTC registers
|
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/// and `count`, which is used to keep track of which byte we're reading
|
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/// is incremeneted
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fn lap(self: *Reader) void {
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self.i = 0;
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self.count += 1;
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}
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|
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/// Resets the state of a `Reader` in preparation for a future
|
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/// read command
|
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fn reset(self: *Reader) void {
|
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self.i = 0;
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self.count = 0;
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}
|
||||
};
|
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|
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const Writer = struct {
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buf: u8,
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i: u4,
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|
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/// The Number of bytes written since last reset
|
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count: u8,
|
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|
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/// Append a bit to the internal bit buffer (aka an integer)
|
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fn push(self: *Writer, value: u1) void {
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const idx = @intCast(u3, self.i);
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self.buf = (self.buf & ~(@as(u8, 1) << idx)) | @as(u8, value) << idx;
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self.i += 1;
|
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}
|
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|
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/// Takes the contents of the internal buffer and writes it to an RTC register
|
||||
/// Where it writes to is dependent on:
|
||||
///
|
||||
/// 1. The RTC State Machine, whitch tells us which register we're accessing
|
||||
/// 2. A `count`, which keeps track of which byte is currently being read
|
||||
fn write(self: *const Writer, clock: *Clock, register: Register) void {
|
||||
// FIXME: What do do about unused bits?
|
||||
switch (register) {
|
||||
.Control => switch (self.count) {
|
||||
0 => clock.cnt.raw = (clock.cnt.raw & 0x80) | (self.buf & 0x7F), // Bit 7 read-only
|
||||
else => std.debug.panic("Tried to write to byte #{} of {} (hint: there's only 1 byte)", .{ self.count, register }),
|
||||
},
|
||||
.DateTime, .Time => log.debug("RTC: Ignoring {} write", .{register}),
|
||||
}
|
||||
}
|
||||
|
||||
/// Is true when 8 bits have been shifted into the internal buffer
|
||||
fn finished(self: *const Writer) bool {
|
||||
return self.i >= 8;
|
||||
}
|
||||
|
||||
/// Resets the internal buffer
|
||||
/// resets the index used to shift bits into the internal buffer
|
||||
/// increments `count` (which keeps track of byte offsets) by one
|
||||
fn lap(self: *Writer) void {
|
||||
self.buf = 0;
|
||||
self.i = 0;
|
||||
self.count += 1;
|
||||
}
|
||||
|
||||
/// Resets `Writer` to a clean state in preparation for a future write command
|
||||
fn reset(self: *Writer) void {
|
||||
self.buf = 0;
|
||||
self.i = 0;
|
||||
self.count = 0;
|
||||
}
|
||||
};
|
||||
|
||||
const Data = extern union {
|
||||
sck: Bit(u8, 0),
|
||||
sio: Bit(u8, 1),
|
||||
cs: Bit(u8, 2),
|
||||
raw: u8,
|
||||
};
|
||||
|
||||
const Control = extern union {
|
||||
/// Unknown, value should be preserved though
|
||||
unk: Bit(u8, 1),
|
||||
/// Per-minute IRQ
|
||||
/// If set, fire a Gamepak IRQ every 30s,
|
||||
irq: Bit(u8, 3),
|
||||
/// 12/24 Hour Bit
|
||||
/// If set, 12h mode
|
||||
/// If cleared, 24h mode
|
||||
mode: Bit(u8, 6),
|
||||
/// Read-Only, bit cleared on read
|
||||
/// If is set, means that there has been a failure / time has been lost
|
||||
off: Bit(u8, 7),
|
||||
raw: u8,
|
||||
};
|
||||
|
||||
fn init(ptr: *This, cpu: *Arm7tdmi, gpio: *const Gpio) void {
|
||||
ptr.* = .{
|
||||
.writer = .{ .buf = 0, .i = 0, .count = 0 },
|
||||
.reader = .{ .i = 0, .count = 0 },
|
||||
.state = .Idle,
|
||||
.cnt = .{ .raw = 0 },
|
||||
.year = 0x01,
|
||||
.month = 0x6,
|
||||
.day = 0x13,
|
||||
.weekday = 0x3,
|
||||
.hour = 0x23,
|
||||
.minute = 0x59,
|
||||
.second = 0x59,
|
||||
.cpu = cpu,
|
||||
.gpio = gpio, // Can't use Arm7tdmi ptr b/c not initialized yet
|
||||
};
|
||||
|
||||
cpu.sched.push(.RealTimeClock, 1 << 24); // Every Second
|
||||
}
|
||||
|
||||
pub fn updateTime(self: *This, late: u64) void {
|
||||
self.cpu.sched.push(.RealTimeClock, (1 << 24) -| late); // Reschedule
|
||||
|
||||
const now = DateTime.now();
|
||||
self.year = toBcd(u8, @intCast(u8, now.date.year - 2000));
|
||||
self.month = toBcd(u5, now.date.month);
|
||||
self.day = toBcd(u6, now.date.day);
|
||||
self.weekday = toBcd(u3, (now.date.weekday() + 1) % 7); // API is Monday = 0, Sunday = 6. We want Sunday = 0, Saturday = 6
|
||||
self.hour = toBcd(u6, now.time.hour);
|
||||
self.minute = toBcd(u7, now.time.minute);
|
||||
self.second = toBcd(u7, now.time.second);
|
||||
}
|
||||
|
||||
fn step(self: *This, value: Data) u4 {
|
||||
const cache: Data = .{ .raw = self.gpio.data };
|
||||
|
||||
return switch (self.state) {
|
||||
.Idle => blk: {
|
||||
// FIXME: Maybe check incoming value to see if SCK is also high?
|
||||
if (cache.sck.read()) {
|
||||
if (!cache.cs.read() and value.cs.read()) {
|
||||
log.debug("RTC: Entering Command Mode", .{});
|
||||
self.state = .Command;
|
||||
}
|
||||
}
|
||||
|
||||
break :blk @truncate(u4, value.raw);
|
||||
},
|
||||
.Command => blk: {
|
||||
if (!value.cs.read()) log.err("RTC: Expected CS to be set during {}, however CS was cleared", .{self.state});
|
||||
|
||||
// If SCK rises, sample SIO
|
||||
if (!cache.sck.read() and value.sck.read()) {
|
||||
self.writer.push(@boolToInt(value.sio.read()));
|
||||
|
||||
if (self.writer.finished()) {
|
||||
self.state = self.processCommand(self.writer.buf);
|
||||
self.writer.reset();
|
||||
|
||||
log.debug("RTC: Switching to {}", .{self.state});
|
||||
}
|
||||
}
|
||||
|
||||
break :blk @truncate(u4, value.raw);
|
||||
},
|
||||
.Write => |register| blk: {
|
||||
if (!value.cs.read()) log.err("RTC: Expected CS to be set during {}, however CS was cleared", .{self.state});
|
||||
|
||||
// If SCK rises, sample SIO
|
||||
if (!cache.sck.read() and value.sck.read()) {
|
||||
self.writer.push(@boolToInt(value.sio.read()));
|
||||
|
||||
const register_width: u32 = switch (register) {
|
||||
.Control => 1,
|
||||
.DateTime => 7,
|
||||
.Time => 3,
|
||||
};
|
||||
|
||||
if (self.writer.finished()) {
|
||||
self.writer.write(self, register); // write inner buffer to RTC register
|
||||
self.writer.lap();
|
||||
|
||||
if (self.writer.count == register_width) {
|
||||
self.writer.reset();
|
||||
self.state = .Idle;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
break :blk @truncate(u4, value.raw);
|
||||
},
|
||||
.Read => |register| blk: {
|
||||
if (!value.cs.read()) log.err("RTC: Expected CS to be set during {}, however CS was cleared", .{self.state});
|
||||
var ret = value;
|
||||
|
||||
// if SCK rises, sample SIO
|
||||
if (!cache.sck.read() and value.sck.read()) {
|
||||
ret.sio.write(self.reader.read(self, register) == 0b1);
|
||||
|
||||
const register_width: u32 = switch (register) {
|
||||
.Control => 1,
|
||||
.DateTime => 7,
|
||||
.Time => 3,
|
||||
};
|
||||
|
||||
if (self.reader.finished()) {
|
||||
self.reader.lap();
|
||||
|
||||
if (self.reader.count == register_width) {
|
||||
self.reader.reset();
|
||||
self.state = .Idle;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
break :blk @truncate(u4, ret.raw);
|
||||
},
|
||||
};
|
||||
}
|
||||
|
||||
fn reset(self: *This) void {
|
||||
// mGBA and NBA only zero the control register. We will do the same
|
||||
log.debug("RTC: Reset (control register was zeroed)", .{});
|
||||
|
||||
self.cnt.raw = 0;
|
||||
}
|
||||
|
||||
fn irq(self: *This) void {
|
||||
// TODO: Confirm that this is the right behaviour
|
||||
log.debug("RTC: Force GamePak IRQ", .{});
|
||||
|
||||
self.cpu.bus.io.irq.game_pak.set();
|
||||
self.cpu.handleInterrupt();
|
||||
}
|
||||
|
||||
fn processCommand(self: *This, raw_command: u8) State {
|
||||
const command = blk: {
|
||||
// If High Nybble is 0x6, no need to switch the endianness
|
||||
if (raw_command >> 4 & 0xF == 0x6) break :blk raw_command;
|
||||
|
||||
// Turns out reversing the order of bits isn't trivial at all
|
||||
// https://stackoverflow.com/questions/2602823/in-c-c-whats-the-simplest-way-to-reverse-the-order-of-bits-in-a-byte
|
||||
var ret = raw_command;
|
||||
ret = (ret & 0xF0) >> 4 | (ret & 0x0F) << 4;
|
||||
ret = (ret & 0xCC) >> 2 | (ret & 0x33) << 2;
|
||||
ret = (ret & 0xAA) >> 1 | (ret & 0x55) << 1;
|
||||
|
||||
break :blk ret;
|
||||
};
|
||||
log.debug("RTC: Handling Command 0x{X:0>2} [0b{b:0>8}]", .{ command, command });
|
||||
|
||||
const is_write = command & 1 == 0;
|
||||
const rtc_register = @truncate(u3, command >> 1 & 0x7);
|
||||
|
||||
if (is_write) {
|
||||
return switch (rtc_register) {
|
||||
0 => blk: {
|
||||
self.reset();
|
||||
break :blk .Idle;
|
||||
},
|
||||
1 => .{ .Write = .Control },
|
||||
2 => .{ .Write = .DateTime },
|
||||
3 => .{ .Write = .Time },
|
||||
6 => blk: {
|
||||
self.irq();
|
||||
break :blk .Idle;
|
||||
},
|
||||
4, 5, 7 => .Idle,
|
||||
};
|
||||
} else {
|
||||
return switch (rtc_register) {
|
||||
1 => .{ .Read = .Control },
|
||||
2 => .{ .Read = .DateTime },
|
||||
3 => .{ .Read = .Time },
|
||||
0, 4, 5, 6, 7 => .Idle, // Do Nothing
|
||||
};
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
fn toBcd(comptime T: type, value: u8) T {
|
||||
var input = value;
|
||||
var ret: u8 = 0;
|
||||
var shift: u3 = 0;
|
||||
|
||||
while (input > 0) {
|
||||
ret |= (input % 10) << (shift << 2);
|
||||
shift += 1;
|
||||
input /= 10;
|
||||
}
|
||||
|
||||
return @truncate(T, ret);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -3,11 +3,12 @@ const Allocator = std.mem.Allocator;
|
|||
const log = std.log.scoped(.Backup);
|
||||
|
||||
const escape = @import("../util.zig").escape;
|
||||
const asStringSlice = @import("../util.zig").asStringSlice;
|
||||
const span = @import("../util.zig").span;
|
||||
|
||||
const backup_kinds = [5]Needle{
|
||||
const backup_kinds = [6]Needle{
|
||||
.{ .str = "EEPROM_V", .kind = .Eeprom },
|
||||
.{ .str = "SRAM_V", .kind = .Sram },
|
||||
.{ .str = "SRAM_F_V", .kind = .Sram },
|
||||
.{ .str = "FLASH_V", .kind = .Flash },
|
||||
.{ .str = "FLASH512_V", .kind = .Flash },
|
||||
.{ .str = "FLASH1M_V", .kind = .Flash1M },
|
||||
|
|
@ -128,7 +129,7 @@ pub const Backup = struct {
|
|||
}
|
||||
|
||||
fn getSaveFilename(self: *const Self, allocator: Allocator) ![]const u8 {
|
||||
const title_str = asStringSlice(&escape(self.title));
|
||||
const title_str = span(&escape(self.title));
|
||||
const name = if (title_str.len != 0) title_str else "untitled";
|
||||
|
||||
return try std.mem.concat(allocator, u8, &[_][]const u8{ name, ".sav" });
|
||||
|
|
|
|||
|
|
@ -0,0 +1,463 @@
|
|||
const std = @import("std");
|
||||
const Bit = @import("bitfield").Bit;
|
||||
const Bitfield = @import("bitfield").Bitfield;
|
||||
const DateTime = @import("datetime").datetime.Datetime;
|
||||
|
||||
const Arm7tdmi = @import("../cpu.zig").Arm7tdmi;
|
||||
const Allocator = std.mem.Allocator;
|
||||
|
||||
/// GPIO Register Implementation
|
||||
pub const Gpio = struct {
|
||||
const Self = @This();
|
||||
const log = std.log.scoped(.Gpio);
|
||||
|
||||
data: u4,
|
||||
direction: u4,
|
||||
cnt: u1,
|
||||
|
||||
device: Device,
|
||||
|
||||
const Register = enum { Data, Direction, Control };
|
||||
|
||||
pub const Device = struct {
|
||||
ptr: ?*anyopaque,
|
||||
kind: Kind, // TODO: Make comptime known?
|
||||
|
||||
pub const Kind = enum { Rtc, None };
|
||||
|
||||
fn step(self: *Device, value: u4) u4 {
|
||||
return switch (self.kind) {
|
||||
.Rtc => blk: {
|
||||
const clock = @ptrCast(*Clock, @alignCast(@alignOf(*Clock), self.ptr.?));
|
||||
break :blk clock.step(Clock.Data{ .raw = value });
|
||||
},
|
||||
.None => value,
|
||||
};
|
||||
}
|
||||
|
||||
fn init(kind: Kind, ptr: ?*anyopaque) Device {
|
||||
return .{ .kind = kind, .ptr = ptr };
|
||||
}
|
||||
};
|
||||
|
||||
pub fn write(self: *Self, comptime reg: Register, value: if (reg == .Control) u1 else u4) void {
|
||||
switch (reg) {
|
||||
.Data => {
|
||||
const masked_value = value & self.direction;
|
||||
|
||||
// The value which is actually stored in the GPIO register
|
||||
// might be modified by the device implementing the GPIO interface e.g. RTC reads
|
||||
self.data = self.device.step(masked_value);
|
||||
},
|
||||
.Direction => self.direction = value,
|
||||
.Control => self.cnt = value,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn read(self: *const Self, comptime reg: Register) if (reg == .Control) u1 else u4 {
|
||||
if (self.cnt == 0) return 0;
|
||||
|
||||
return switch (reg) {
|
||||
.Data => self.data & ~self.direction,
|
||||
.Direction => self.direction,
|
||||
.Control => self.cnt,
|
||||
};
|
||||
}
|
||||
|
||||
pub fn init(allocator: Allocator, cpu: *Arm7tdmi, kind: Device.Kind) !*Self {
|
||||
log.info("Device: {}", .{kind});
|
||||
|
||||
const self = try allocator.create(Self);
|
||||
self.* = .{
|
||||
.data = 0b0000,
|
||||
.direction = 0b1111, // TODO: What is GPIO DIrection set to by default?
|
||||
.cnt = 0b0,
|
||||
|
||||
.device = switch (kind) {
|
||||
.Rtc => blk: {
|
||||
const clock = try allocator.create(Clock);
|
||||
clock.init(cpu, self);
|
||||
|
||||
break :blk Device{ .kind = kind, .ptr = clock };
|
||||
},
|
||||
.None => Device{ .kind = kind, .ptr = null },
|
||||
},
|
||||
};
|
||||
|
||||
return self;
|
||||
}
|
||||
|
||||
pub fn deinit(self: *Self, allocator: Allocator) void {
|
||||
switch (self.device.kind) {
|
||||
.Rtc => allocator.destroy(@ptrCast(*Clock, @alignCast(@alignOf(*Clock), self.device.ptr.?))),
|
||||
.None => {},
|
||||
}
|
||||
|
||||
self.* = undefined;
|
||||
}
|
||||
};
|
||||
|
||||
/// GBA Real Time Clock
|
||||
pub const Clock = struct {
|
||||
const Self = @This();
|
||||
const log = std.log.scoped(.Rtc);
|
||||
|
||||
writer: Writer,
|
||||
reader: Reader,
|
||||
state: State,
|
||||
cnt: Control,
|
||||
|
||||
year: u8,
|
||||
month: u5,
|
||||
day: u6,
|
||||
weekday: u3,
|
||||
hour: u6,
|
||||
minute: u7,
|
||||
second: u7,
|
||||
|
||||
cpu: *Arm7tdmi,
|
||||
gpio: *const Gpio,
|
||||
|
||||
const Register = enum {
|
||||
Control,
|
||||
DateTime,
|
||||
Time,
|
||||
};
|
||||
|
||||
const State = union(enum) {
|
||||
Idle,
|
||||
Command,
|
||||
Write: Register,
|
||||
Read: Register,
|
||||
};
|
||||
|
||||
const Reader = struct {
|
||||
i: u4,
|
||||
count: u8,
|
||||
|
||||
/// Reads a bit from RTC registers. Which bit it reads is dependent on
|
||||
///
|
||||
/// 1. The RTC State Machine, whitch tells us which register we're accessing
|
||||
/// 2. A `count`, which keeps track of which byte is currently being read
|
||||
/// 3. An index, which keeps track of which bit of the byte determined by `count` is being read
|
||||
fn read(self: *Reader, clock: *const Clock, register: Register) u1 {
|
||||
const idx = @intCast(u3, self.i);
|
||||
defer self.i += 1;
|
||||
|
||||
// FIXME: What do I do about the unused bits?
|
||||
return switch (register) {
|
||||
.Control => @truncate(u1, switch (self.count) {
|
||||
0 => clock.cnt.raw >> idx,
|
||||
else => std.debug.panic("Tried to read from byte #{} of {} (hint: there's only 1 byte)", .{ self.count, register }),
|
||||
}),
|
||||
.DateTime => @truncate(u1, switch (self.count) {
|
||||
// Date
|
||||
0 => clock.year >> idx,
|
||||
1 => @as(u8, clock.month) >> idx,
|
||||
2 => @as(u8, clock.day) >> idx,
|
||||
3 => @as(u8, clock.weekday) >> idx,
|
||||
|
||||
// Time
|
||||
4 => @as(u8, clock.hour) >> idx,
|
||||
5 => @as(u8, clock.minute) >> idx,
|
||||
6 => @as(u8, clock.second) >> idx,
|
||||
else => std.debug.panic("Tried to read from byte #{} of {} (hint: there's only 7 bytes)", .{ self.count, register }),
|
||||
}),
|
||||
.Time => @truncate(u1, switch (self.count) {
|
||||
0 => @as(u8, clock.hour) >> idx,
|
||||
1 => @as(u8, clock.minute) >> idx,
|
||||
2 => @as(u8, clock.second) >> idx,
|
||||
else => std.debug.panic("Tried to read from byte #{} of {} (hint: there's only 3 bytes)", .{ self.count, register }),
|
||||
}),
|
||||
};
|
||||
}
|
||||
|
||||
/// Is true when a Reader has read a u8's worth of bits
|
||||
fn finished(self: *const Reader) bool {
|
||||
return self.i >= 8;
|
||||
}
|
||||
|
||||
/// Resets the index used to shift bits out of RTC registers
|
||||
/// and `count`, which is used to keep track of which byte we're reading
|
||||
/// is incremeneted
|
||||
fn lap(self: *Reader) void {
|
||||
self.i = 0;
|
||||
self.count += 1;
|
||||
}
|
||||
|
||||
/// Resets the state of a `Reader` in preparation for a future
|
||||
/// read command
|
||||
fn reset(self: *Reader) void {
|
||||
self.i = 0;
|
||||
self.count = 0;
|
||||
}
|
||||
};
|
||||
|
||||
const Writer = struct {
|
||||
buf: u8,
|
||||
i: u4,
|
||||
|
||||
/// The Number of bytes written since last reset
|
||||
count: u8,
|
||||
|
||||
/// Append a bit to the internal bit buffer (aka an integer)
|
||||
fn push(self: *Writer, value: u1) void {
|
||||
const idx = @intCast(u3, self.i);
|
||||
self.buf = (self.buf & ~(@as(u8, 1) << idx)) | @as(u8, value) << idx;
|
||||
self.i += 1;
|
||||
}
|
||||
|
||||
/// Takes the contents of the internal buffer and writes it to an RTC register
|
||||
/// Where it writes to is dependent on:
|
||||
///
|
||||
/// 1. The RTC State Machine, whitch tells us which register we're accessing
|
||||
/// 2. A `count`, which keeps track of which byte is currently being read
|
||||
fn write(self: *const Writer, clock: *Clock, register: Register) void {
|
||||
// FIXME: What do do about unused bits?
|
||||
switch (register) {
|
||||
.Control => switch (self.count) {
|
||||
0 => clock.cnt.raw = (clock.cnt.raw & 0x80) | (self.buf & 0x7F), // Bit 7 read-only
|
||||
else => std.debug.panic("Tried to write to byte #{} of {} (hint: there's only 1 byte)", .{ self.count, register }),
|
||||
},
|
||||
.DateTime, .Time => log.debug("Ignoring {} write", .{register}),
|
||||
}
|
||||
}
|
||||
|
||||
/// Is true when 8 bits have been shifted into the internal buffer
|
||||
fn finished(self: *const Writer) bool {
|
||||
return self.i >= 8;
|
||||
}
|
||||
|
||||
/// Resets the internal buffer
|
||||
/// resets the index used to shift bits into the internal buffer
|
||||
/// increments `count` (which keeps track of byte offsets) by one
|
||||
fn lap(self: *Writer) void {
|
||||
self.buf = 0;
|
||||
self.i = 0;
|
||||
self.count += 1;
|
||||
}
|
||||
|
||||
/// Resets `Writer` to a clean state in preparation for a future write command
|
||||
fn reset(self: *Writer) void {
|
||||
self.buf = 0;
|
||||
self.i = 0;
|
||||
self.count = 0;
|
||||
}
|
||||
};
|
||||
|
||||
const Data = extern union {
|
||||
sck: Bit(u8, 0),
|
||||
sio: Bit(u8, 1),
|
||||
cs: Bit(u8, 2),
|
||||
raw: u8,
|
||||
};
|
||||
|
||||
const Control = extern union {
|
||||
/// Unknown, value should be preserved though
|
||||
unk: Bit(u8, 1),
|
||||
/// Per-minute IRQ
|
||||
/// If set, fire a Gamepak IRQ every 30s,
|
||||
irq: Bit(u8, 3),
|
||||
/// 12/24 Hour Bit
|
||||
/// If set, 12h mode
|
||||
/// If cleared, 24h mode
|
||||
mode: Bit(u8, 6),
|
||||
/// Read-Only, bit cleared on read
|
||||
/// If is set, means that there has been a failure / time has been lost
|
||||
off: Bit(u8, 7),
|
||||
raw: u8,
|
||||
};
|
||||
|
||||
fn init(ptr: *Self, cpu: *Arm7tdmi, gpio: *const Gpio) void {
|
||||
ptr.* = .{
|
||||
.writer = .{ .buf = 0, .i = 0, .count = 0 },
|
||||
.reader = .{ .i = 0, .count = 0 },
|
||||
.state = .Idle,
|
||||
.cnt = .{ .raw = 0 },
|
||||
.year = 0x01,
|
||||
.month = 0x6,
|
||||
.day = 0x13,
|
||||
.weekday = 0x3,
|
||||
.hour = 0x23,
|
||||
.minute = 0x59,
|
||||
.second = 0x59,
|
||||
.cpu = cpu,
|
||||
.gpio = gpio, // Can't use Arm7tdmi ptr b/c not initialized yet
|
||||
};
|
||||
|
||||
cpu.sched.push(.RealTimeClock, 1 << 24); // Every Second
|
||||
}
|
||||
|
||||
pub fn updateTime(self: *Self, late: u64) void {
|
||||
self.cpu.sched.push(.RealTimeClock, (1 << 24) -| late); // Reschedule
|
||||
|
||||
const now = DateTime.now();
|
||||
self.year = bcd(u8, @intCast(u8, now.date.year - 2000));
|
||||
self.month = bcd(u5, now.date.month);
|
||||
self.day = bcd(u6, now.date.day);
|
||||
self.weekday = bcd(u3, (now.date.weekday() + 1) % 7); // API is Monday = 0, Sunday = 6. We want Sunday = 0, Saturday = 6
|
||||
self.hour = bcd(u6, now.time.hour);
|
||||
self.minute = bcd(u7, now.time.minute);
|
||||
self.second = bcd(u7, now.time.second);
|
||||
}
|
||||
|
||||
fn step(self: *Self, value: Data) u4 {
|
||||
const cache: Data = .{ .raw = self.gpio.data };
|
||||
|
||||
return switch (self.state) {
|
||||
.Idle => blk: {
|
||||
// FIXME: Maybe check incoming value to see if SCK is also high?
|
||||
if (cache.sck.read()) {
|
||||
if (!cache.cs.read() and value.cs.read()) {
|
||||
log.debug("Entering Command Mode", .{});
|
||||
self.state = .Command;
|
||||
}
|
||||
}
|
||||
|
||||
break :blk @truncate(u4, value.raw);
|
||||
},
|
||||
.Command => blk: {
|
||||
if (!value.cs.read()) log.err("Expected CS to be set during {}, however CS was cleared", .{self.state});
|
||||
|
||||
// If SCK rises, sample SIO
|
||||
if (!cache.sck.read() and value.sck.read()) {
|
||||
self.writer.push(@boolToInt(value.sio.read()));
|
||||
|
||||
if (self.writer.finished()) {
|
||||
self.state = self.processCommand(self.writer.buf);
|
||||
self.writer.reset();
|
||||
|
||||
log.debug("Switching to {}", .{self.state});
|
||||
}
|
||||
}
|
||||
|
||||
break :blk @truncate(u4, value.raw);
|
||||
},
|
||||
.Write => |register| blk: {
|
||||
if (!value.cs.read()) log.err("Expected CS to be set during {}, however CS was cleared", .{self.state});
|
||||
|
||||
// If SCK rises, sample SIO
|
||||
if (!cache.sck.read() and value.sck.read()) {
|
||||
self.writer.push(@boolToInt(value.sio.read()));
|
||||
|
||||
const register_width: u32 = switch (register) {
|
||||
.Control => 1,
|
||||
.DateTime => 7,
|
||||
.Time => 3,
|
||||
};
|
||||
|
||||
if (self.writer.finished()) {
|
||||
self.writer.write(self, register); // write inner buffer to RTC register
|
||||
self.writer.lap();
|
||||
|
||||
if (self.writer.count == register_width) {
|
||||
self.writer.reset();
|
||||
self.state = .Idle;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
break :blk @truncate(u4, value.raw);
|
||||
},
|
||||
.Read => |register| blk: {
|
||||
if (!value.cs.read()) log.err("Expected CS to be set during {}, however CS was cleared", .{self.state});
|
||||
var ret = value;
|
||||
|
||||
// if SCK rises, sample SIO
|
||||
if (!cache.sck.read() and value.sck.read()) {
|
||||
ret.sio.write(self.reader.read(self, register) == 0b1);
|
||||
|
||||
const register_width: u32 = switch (register) {
|
||||
.Control => 1,
|
||||
.DateTime => 7,
|
||||
.Time => 3,
|
||||
};
|
||||
|
||||
if (self.reader.finished()) {
|
||||
self.reader.lap();
|
||||
|
||||
if (self.reader.count == register_width) {
|
||||
self.reader.reset();
|
||||
self.state = .Idle;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
break :blk @truncate(u4, ret.raw);
|
||||
},
|
||||
};
|
||||
}
|
||||
|
||||
fn reset(self: *Self) void {
|
||||
// mGBA and NBA only zero the control register. We will do the same
|
||||
log.debug("Reset (control register was zeroed)", .{});
|
||||
|
||||
self.cnt.raw = 0;
|
||||
}
|
||||
|
||||
fn irq(self: *Self) void {
|
||||
// TODO: Confirm that this is the right behaviour
|
||||
log.debug("Force GamePak IRQ", .{});
|
||||
|
||||
self.cpu.bus.io.irq.game_pak.set();
|
||||
self.cpu.handleInterrupt();
|
||||
}
|
||||
|
||||
fn processCommand(self: *Self, raw_command: u8) State {
|
||||
const command = blk: {
|
||||
// If High Nybble is 0x6, no need to switch the endianness
|
||||
if (raw_command >> 4 & 0xF == 0x6) break :blk raw_command;
|
||||
|
||||
// Turns out reversing the order of bits isn't trivial at all
|
||||
// https://stackoverflow.com/questions/2602823/in-c-c-whats-the-simplest-way-to-reverse-the-order-of-bits-in-a-byte
|
||||
var ret = raw_command;
|
||||
ret = (ret & 0xF0) >> 4 | (ret & 0x0F) << 4;
|
||||
ret = (ret & 0xCC) >> 2 | (ret & 0x33) << 2;
|
||||
ret = (ret & 0xAA) >> 1 | (ret & 0x55) << 1;
|
||||
|
||||
break :blk ret;
|
||||
};
|
||||
log.debug("Handling Command 0x{X:0>2} [0b{b:0>8}]", .{ command, command });
|
||||
|
||||
const is_write = command & 1 == 0;
|
||||
const rtc_register = @truncate(u3, command >> 1 & 0x7);
|
||||
|
||||
if (is_write) {
|
||||
return switch (rtc_register) {
|
||||
0 => blk: {
|
||||
self.reset();
|
||||
break :blk .Idle;
|
||||
},
|
||||
1 => .{ .Write = .Control },
|
||||
2 => .{ .Write = .DateTime },
|
||||
3 => .{ .Write = .Time },
|
||||
6 => blk: {
|
||||
self.irq();
|
||||
break :blk .Idle;
|
||||
},
|
||||
4, 5, 7 => .Idle,
|
||||
};
|
||||
} else {
|
||||
return switch (rtc_register) {
|
||||
1 => .{ .Read = .Control },
|
||||
2 => .{ .Read = .DateTime },
|
||||
3 => .{ .Read = .Time },
|
||||
0, 4, 5, 6, 7 => .Idle, // Do Nothing
|
||||
};
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
fn bcd(comptime T: type, value: u8) T {
|
||||
var input = value;
|
||||
var ret: u8 = 0;
|
||||
var shift: u3 = 0;
|
||||
|
||||
while (input > 0) {
|
||||
ret |= (input % 10) << (shift << 2);
|
||||
shift += 1;
|
||||
input /= 10;
|
||||
}
|
||||
|
||||
return @truncate(T, ret);
|
||||
}
|
||||
|
|
@ -2,7 +2,7 @@ const std = @import("std");
|
|||
|
||||
const Bus = @import("Bus.zig");
|
||||
const Arm7tdmi = @import("cpu.zig").Arm7tdmi;
|
||||
const Clock = @import("bus/GamePak.zig").Clock;
|
||||
const Clock = @import("bus/gpio.zig").Clock;
|
||||
|
||||
const Order = std.math.Order;
|
||||
const PriorityQueue = std.PriorityQueue;
|
||||
|
|
|
|||
|
|
@ -66,36 +66,68 @@ pub fn intToBytes(comptime T: type, value: anytype) [@sizeOf(T)]u8 {
|
|||
return result;
|
||||
}
|
||||
|
||||
/// The Title from the GBA Cartridge may be null padded to a maximum
|
||||
/// length of 12 bytes.
|
||||
/// The Title from the GBA Cartridge is an Uppercase ASCII string which is
|
||||
/// null-padded to 12 bytes
|
||||
///
|
||||
/// This function returns a slice of everything just before the first
|
||||
/// `\0`
|
||||
pub fn asStringSlice(title: *const [12]u8) []const u8 {
|
||||
var len = title.len;
|
||||
for (title) |char, i| {
|
||||
if (char == 0) {
|
||||
len = i;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return title[0..len];
|
||||
/// This function returns a slice of the ASCII string without the null terminator(s)
|
||||
/// (essentially, a proper Zig/Rust/Any modern language String)
|
||||
pub fn span(title: *const [12]u8) []const u8 {
|
||||
const end = std.mem.indexOfScalar(u8, title, '\x00');
|
||||
return title[0 .. end orelse title.len];
|
||||
}
|
||||
|
||||
/// Copies a Title and returns either an identical or similar
|
||||
/// array consisting of ASCII that won't make any file system angry
|
||||
test "span" {
|
||||
var example: *const [12]u8 = "POKEMON_EMER";
|
||||
try std.testing.expectEqualSlices(u8, "POKEMON_EMER", span(example));
|
||||
|
||||
example = "POKEMON_EME\x00";
|
||||
try std.testing.expectEqualSlices(u8, "POKEMON_EME", span(example));
|
||||
|
||||
example = "POKEMON_EM\x00\x00";
|
||||
try std.testing.expectEqualSlices(u8, "POKEMON_EM", span(example));
|
||||
|
||||
example = "POKEMON_E\x00\x00\x00";
|
||||
try std.testing.expectEqualSlices(u8, "POKEMON_E", span(example));
|
||||
|
||||
example = "POKEMON_\x00\x00\x00\x00";
|
||||
try std.testing.expectEqualSlices(u8, "POKEMON_", span(example));
|
||||
|
||||
example = "POKEMON\x00\x00\x00\x00\x00";
|
||||
try std.testing.expectEqualSlices(u8, "POKEMON", span(example));
|
||||
|
||||
example = "POKEMO\x00\x00\x00\x00\x00\x00";
|
||||
try std.testing.expectEqualSlices(u8, "POKEMO", span(example));
|
||||
|
||||
example = "POKEM\x00\x00\x00\x00\x00\x00\x00";
|
||||
try std.testing.expectEqualSlices(u8, "POKEM", span(example));
|
||||
|
||||
example = "POKE\x00\x00\x00\x00\x00\x00\x00\x00";
|
||||
try std.testing.expectEqualSlices(u8, "POKE", span(example));
|
||||
|
||||
example = "POK\x00\x00\x00\x00\x00\x00\x00\x00\x00";
|
||||
try std.testing.expectEqualSlices(u8, "POK", span(example));
|
||||
|
||||
example = "PO\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
|
||||
try std.testing.expectEqualSlices(u8, "PO", span(example));
|
||||
|
||||
example = "P\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
|
||||
try std.testing.expectEqualSlices(u8, "P", span(example));
|
||||
|
||||
example = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
|
||||
try std.testing.expectEqualSlices(u8, "", span(example));
|
||||
}
|
||||
|
||||
/// Creates a copy of a title with all Filesystem-invalid characters replaced
|
||||
///
|
||||
/// e.g. POKEPIN R/S to POKEPIN R_S
|
||||
pub fn escape(title: [12]u8) [12]u8 {
|
||||
var result: [12]u8 = title;
|
||||
var ret: [12]u8 = title;
|
||||
|
||||
for (result) |*char| {
|
||||
if (char.* == '/' or char.* == '\\') char.* = '_';
|
||||
if (char.* == 0) break;
|
||||
}
|
||||
//TODO: Add more replacements
|
||||
std.mem.replaceScalar(u8, &ret, '/', '_');
|
||||
std.mem.replaceScalar(u8, &ret, '\\', '_');
|
||||
|
||||
return result;
|
||||
return ret;
|
||||
}
|
||||
|
||||
pub const FilePaths = struct {
|
||||
|
|
|
|||
|
|
@ -4,14 +4,14 @@ const builtin = @import("builtin");
|
|||
const known_folders = @import("known_folders");
|
||||
const clap = @import("clap");
|
||||
|
||||
const Gui = @import("Gui.zig");
|
||||
const Gui = @import("platform.zig").Gui;
|
||||
const Bus = @import("core/Bus.zig");
|
||||
const Arm7tdmi = @import("core/cpu.zig").Arm7tdmi;
|
||||
const Scheduler = @import("core/scheduler.zig").Scheduler;
|
||||
const FilePaths = @import("core/util.zig").FilePaths;
|
||||
|
||||
const Allocator = std.mem.Allocator;
|
||||
const log = std.log.scoped(.CLI);
|
||||
const log = std.log.scoped(.Cli);
|
||||
const width = @import("core/ppu.zig").width;
|
||||
const height = @import("core/ppu.zig").height;
|
||||
const cpu_logging = @import("core/emu.zig").cpu_logging;
|
||||
|
|
@ -54,8 +54,7 @@ pub fn main() anyerror!void {
|
|||
try bus.init(allocator, &scheduler, &cpu, paths);
|
||||
defer bus.deinit();
|
||||
|
||||
var gui = Gui.init(bus.pak.title, width, height);
|
||||
gui.initAudio(&bus.apu);
|
||||
var gui = Gui.init(&bus.pak.title, &bus.apu, width, height);
|
||||
defer gui.deinit();
|
||||
|
||||
try gui.run(&cpu, &scheduler);
|
||||
|
|
|
|||
|
|
@ -0,0 +1,190 @@
|
|||
const std = @import("std");
|
||||
const SDL = @import("sdl2");
|
||||
const emu = @import("core/emu.zig");
|
||||
|
||||
const Apu = @import("core/apu.zig").Apu;
|
||||
const Arm7tdmi = @import("core/cpu.zig").Arm7tdmi;
|
||||
const Scheduler = @import("core/scheduler.zig").Scheduler;
|
||||
const FpsTracker = @import("core/util.zig").FpsTracker;
|
||||
|
||||
const span = @import("core/util.zig").span;
|
||||
|
||||
const pitch = @import("core/ppu.zig").framebuf_pitch;
|
||||
const scale = @import("core/emu.zig").win_scale;
|
||||
|
||||
const default_title: []const u8 = "ZBA";
|
||||
|
||||
pub const Gui = struct {
|
||||
const Self = @This();
|
||||
const log = std.log.scoped(.Gui);
|
||||
|
||||
window: *SDL.SDL_Window,
|
||||
title: []const u8,
|
||||
renderer: *SDL.SDL_Renderer,
|
||||
texture: *SDL.SDL_Texture,
|
||||
audio: Audio,
|
||||
|
||||
pub fn init(title: *const [12]u8, apu: *Apu, width: i32, height: i32) Self {
|
||||
const ret = SDL.SDL_Init(SDL.SDL_INIT_VIDEO | SDL.SDL_INIT_EVENTS | SDL.SDL_INIT_AUDIO | SDL.SDL_INIT_GAMECONTROLLER);
|
||||
if (ret < 0) panic();
|
||||
|
||||
const window = SDL.SDL_CreateWindow(
|
||||
default_title.ptr,
|
||||
SDL.SDL_WINDOWPOS_CENTERED,
|
||||
SDL.SDL_WINDOWPOS_CENTERED,
|
||||
@as(c_int, width * scale),
|
||||
@as(c_int, height * scale),
|
||||
SDL.SDL_WINDOW_SHOWN,
|
||||
) orelse panic();
|
||||
|
||||
const renderer = SDL.SDL_CreateRenderer(window, -1, SDL.SDL_RENDERER_ACCELERATED | SDL.SDL_RENDERER_PRESENTVSYNC) orelse panic();
|
||||
|
||||
const texture = SDL.SDL_CreateTexture(
|
||||
renderer,
|
||||
SDL.SDL_PIXELFORMAT_RGBA8888,
|
||||
SDL.SDL_TEXTUREACCESS_STREAMING,
|
||||
@as(c_int, width),
|
||||
@as(c_int, height),
|
||||
) orelse panic();
|
||||
|
||||
return Self{
|
||||
.window = window,
|
||||
.title = span(title),
|
||||
.renderer = renderer,
|
||||
.texture = texture,
|
||||
.audio = Audio.init(apu),
|
||||
};
|
||||
}
|
||||
|
||||
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, cpu });
|
||||
defer thread.join();
|
||||
|
||||
var title_buf: [0x100]u8 = [_]u8{0} ** 0x100;
|
||||
|
||||
emu_loop: while (true) {
|
||||
var event: SDL.SDL_Event = undefined;
|
||||
while (SDL.SDL_PollEvent(&event) != 0) {
|
||||
switch (event.type) {
|
||||
SDL.SDL_QUIT => break :emu_loop,
|
||||
SDL.SDL_KEYDOWN => {
|
||||
const io = &cpu.bus.io;
|
||||
const key_code = event.key.keysym.sym;
|
||||
|
||||
switch (key_code) {
|
||||
SDL.SDLK_UP => io.keyinput.up.unset(),
|
||||
SDL.SDLK_DOWN => io.keyinput.down.unset(),
|
||||
SDL.SDLK_LEFT => io.keyinput.left.unset(),
|
||||
SDL.SDLK_RIGHT => io.keyinput.right.unset(),
|
||||
SDL.SDLK_x => io.keyinput.a.unset(),
|
||||
SDL.SDLK_z => io.keyinput.b.unset(),
|
||||
SDL.SDLK_a => io.keyinput.shoulder_l.unset(),
|
||||
SDL.SDLK_s => io.keyinput.shoulder_r.unset(),
|
||||
SDL.SDLK_RETURN => io.keyinput.start.unset(),
|
||||
SDL.SDLK_RSHIFT => io.keyinput.select.unset(),
|
||||
else => {},
|
||||
}
|
||||
},
|
||||
SDL.SDL_KEYUP => {
|
||||
const io = &cpu.bus.io;
|
||||
const key_code = event.key.keysym.sym;
|
||||
|
||||
switch (key_code) {
|
||||
SDL.SDLK_UP => io.keyinput.up.set(),
|
||||
SDL.SDLK_DOWN => io.keyinput.down.set(),
|
||||
SDL.SDLK_LEFT => io.keyinput.left.set(),
|
||||
SDL.SDLK_RIGHT => io.keyinput.right.set(),
|
||||
SDL.SDLK_x => io.keyinput.a.set(),
|
||||
SDL.SDLK_z => io.keyinput.b.set(),
|
||||
SDL.SDLK_a => io.keyinput.shoulder_l.set(),
|
||||
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(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}", .{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();
|
||||
|
||||
// try iwram_file.writeAll(cpu.bus.iwram.buf);
|
||||
},
|
||||
else => {},
|
||||
}
|
||||
},
|
||||
else => {},
|
||||
}
|
||||
}
|
||||
|
||||
// Emulator has an internal Double Buffer
|
||||
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);
|
||||
|
||||
const dyn_title = std.fmt.bufPrint(&title_buf, "ZBA | {s} [Emu: {}fps] ", .{ self.title, frame_rate.value() }) catch unreachable;
|
||||
SDL.SDL_SetWindowTitle(self.window, dyn_title.ptr);
|
||||
}
|
||||
|
||||
quit.store(true, .SeqCst); // Terminate Emulator Thread
|
||||
}
|
||||
|
||||
pub fn deinit(self: *Self) void {
|
||||
self.audio.deinit();
|
||||
SDL.SDL_DestroyTexture(self.texture);
|
||||
SDL.SDL_DestroyRenderer(self.renderer);
|
||||
SDL.SDL_DestroyWindow(self.window);
|
||||
SDL.SDL_Quit();
|
||||
self.* = undefined;
|
||||
}
|
||||
};
|
||||
|
||||
const Audio = struct {
|
||||
const Self = @This();
|
||||
const log = std.log.scoped(.PlatformAudio);
|
||||
const sample_rate = @import("core/apu.zig").host_sample_rate;
|
||||
|
||||
device: SDL.SDL_AudioDeviceID,
|
||||
|
||||
fn init(apu: *Apu) Self {
|
||||
var have: SDL.SDL_AudioSpec = undefined;
|
||||
var want: SDL.SDL_AudioSpec = std.mem.zeroes(SDL.SDL_AudioSpec);
|
||||
want.freq = sample_rate;
|
||||
want.format = SDL.AUDIO_U16;
|
||||
want.channels = 2;
|
||||
want.samples = 0x100;
|
||||
want.callback = Self.callback;
|
||||
want.userdata = apu;
|
||||
|
||||
const device = SDL.SDL_OpenAudioDevice(null, 0, &want, &have, 0);
|
||||
if (device == 0) panic();
|
||||
|
||||
SDL.SDL_PauseAudioDevice(device, 0); // Unpause Audio
|
||||
|
||||
return .{ .device = device };
|
||||
}
|
||||
|
||||
fn deinit(self: *Self) void {
|
||||
SDL.SDL_CloseAudioDevice(self.device);
|
||||
self.* = undefined;
|
||||
}
|
||||
|
||||
export fn callback(userdata: ?*anyopaque, stream: [*c]u8, len: c_int) void {
|
||||
const apu = @ptrCast(*Apu, @alignCast(@alignOf(*Apu), userdata));
|
||||
_ = SDL.SDL_AudioStreamGet(apu.stream, stream, len);
|
||||
|
||||
// If we don't write anything, play silence otherwise garbage will be played
|
||||
// FIXME: I don't think this hack to remove DC Offset is acceptable :thinking:
|
||||
// if (written == 0) std.mem.set(u8, stream[0..@intCast(usize, len)], 0x40);
|
||||
}
|
||||
};
|
||||
|
||||
fn panic() noreturn {
|
||||
const str = @as(?[*:0]const u8, SDL.SDL_GetError()) orelse "unknown error";
|
||||
@panic(std.mem.sliceTo(str, 0));
|
||||
}
|
||||
Loading…
Reference in New Issue