97 lines
3.1 KiB
Zig
97 lines
3.1 KiB
Zig
const std = @import("std");
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const SDL = @import("sdl2");
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const emu = @import("emu.zig");
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const Bus = @import("Bus.zig");
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const Arm7tdmi = @import("cpu.zig").Arm7tdmi;
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const Scheduler = @import("scheduler.zig").Scheduler;
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const Timer = std.time.Timer;
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const window_scale = 3;
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const gba_width = @import("ppu.zig").width;
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const gba_height = @import("ppu.zig").height;
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const buf_pitch = @import("ppu.zig").buf_pitch;
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pub fn main() anyerror!void {
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// Allocator for Emulator + CLI Aruments
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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const alloc = gpa.allocator();
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defer std.debug.assert(!gpa.deinit());
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// Handle CLI Arguments
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const args = try std.process.argsAlloc(alloc);
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defer std.process.argsFree(alloc, args);
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const zba_args: []const []const u8 = args[1..];
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if (zba_args.len == 0) {
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std.log.err("Expected PATH to Gameboy Advance ROM as a CLI argument", .{});
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return;
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} else if (zba_args.len > 1) {
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std.log.err("Too many CLI arguments were provided", .{});
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return;
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}
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// Initialize Emulator
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var scheduler = Scheduler.init(alloc);
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defer scheduler.deinit();
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var bus = try Bus.init(alloc, &scheduler, zba_args[0]);
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defer bus.deinit();
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var cpu = Arm7tdmi.init(&scheduler, &bus);
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cpu.skipBios();
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// Initialize SDL
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const status = SDL.SDL_Init(SDL.SDL_INIT_VIDEO | SDL.SDL_INIT_EVENTS | SDL.SDL_INIT_AUDIO);
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if (status < 0) sdlPanic();
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defer SDL.SDL_Quit();
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var window = SDL.SDL_CreateWindow(
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"Gameboy Advance Emulator",
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SDL.SDL_WINDOWPOS_CENTERED,
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SDL.SDL_WINDOWPOS_CENTERED,
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gba_width * window_scale,
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gba_height * window_scale,
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SDL.SDL_WINDOW_SHOWN,
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) orelse sdlPanic();
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defer SDL.SDL_DestroyWindow(window);
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var renderer = SDL.SDL_CreateRenderer(window, -1, SDL.SDL_RENDERER_ACCELERATED) orelse sdlPanic();
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defer SDL.SDL_DestroyRenderer(renderer);
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const texture = SDL.SDL_CreateTexture(renderer, SDL.SDL_PIXELFORMAT_BGR555, SDL.SDL_TEXTUREACCESS_STREAMING, 240, 160) orelse sdlPanic();
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defer SDL.SDL_DestroyTexture(texture);
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// Init FPS Timer
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var timer = Timer.start() catch unreachable;
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var title_buf: [0x30]u8 = [_]u8{0x00} ** 0x30;
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emu_loop: while (true) {
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emu.runFrame(&scheduler, &cpu, &bus);
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var event: SDL.SDL_Event = undefined;
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_ = SDL.SDL_PollEvent(&event);
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switch (event.type) {
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SDL.SDL_QUIT => break :emu_loop,
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else => {},
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}
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const buf_ptr = bus.ppu.frame_buf.ptr;
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_ = SDL.SDL_UpdateTexture(texture, null, buf_ptr, buf_pitch);
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_ = SDL.SDL_RenderCopy(renderer, texture, null, null);
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SDL.SDL_RenderPresent(renderer);
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const fps = std.time.ns_per_s / timer.lap();
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const title = std.fmt.bufPrint(&title_buf, "Gameboy Advance Emulator FPS: {d}", .{fps}) catch unreachable;
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SDL.SDL_SetWindowTitle(window, title.ptr);
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}
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}
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fn sdlPanic() 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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