191 lines
7.5 KiB
Zig
191 lines
7.5 KiB
Zig
const std = @import("std");
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const SDL = @import("sdl2");
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const emu = @import("core/emu.zig");
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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("util.zig").FpsTracker;
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const span = @import("util.zig").span;
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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 default_title: []const u8 = "ZBA";
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pub const Gui = struct {
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const Self = @This();
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const log = std.log.scoped(.Gui);
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window: *SDL.SDL_Window,
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title: []const 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: *const [12]u8, apu: *Apu, 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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.title = span(title),
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.renderer = renderer,
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.texture = texture,
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.audio = Audio.init(apu),
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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 dyn_title = std.fmt.bufPrint(&title_buf, "ZBA | {s} [Emu: {}fps] ", .{ self.title, frame_rate.value() }) catch unreachable;
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SDL.SDL_SetWindowTitle(self.window, dyn_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 deinit(self: *Self) void {
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self.audio.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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};
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const Audio = struct {
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const Self = @This();
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const log = std.log.scoped(.PlatformAudio);
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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) Self {
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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 = Self.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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SDL.SDL_PauseAudioDevice(device, 0); // Unpause Audio
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return .{ .device = device };
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}
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fn deinit(self: *Self) void {
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SDL.SDL_CloseAudioDevice(self.device);
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self.* = undefined;
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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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