61 lines
1.7 KiB
Zig
61 lines
1.7 KiB
Zig
const std = @import("std");
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const cpu = @import("cpu.zig");
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const Scheduler = @import("scheduler.zig").Scheduler;
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const Display = @import("display.zig").Display;
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const Allocator = std.mem.Allocator;
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const Cpu = cpu.Cpu;
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const FONT_SET: [80]u8 = [_]u8{
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0xF0, 0x90, 0x90, 0x90, 0xF0,
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0x20, 0x60, 0x20, 0x20, 0x70,
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0xF0, 0x10, 0xF0, 0x80, 0xF0,
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0xF0, 0x10, 0xF0, 0x10, 0xF0,
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0x90, 0x90, 0xF0, 0x10, 0x10,
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0xF0, 0x80, 0xF0, 0x10, 0xF0,
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0xF0, 0x80, 0xF0, 0x90, 0xF0,
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0xF0, 0x10, 0x20, 0x40, 0x40,
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0xF0, 0x90, 0xF0, 0x90, 0xF0,
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0xF0, 0x90, 0xF0, 0x10, 0xF0,
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0xF0, 0x90, 0xF0, 0x90, 0x90,
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0xE0, 0x90, 0xE0, 0x90, 0xE0,
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0xF0, 0x80, 0x80, 0x80, 0xF0,
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0xE0, 0x90, 0x90, 0x90, 0xE0,
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0xF0, 0x80, 0xF0, 0x80, 0xF0,
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0xF0, 0x80, 0xF0, 0x80, 0x80,
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};
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pub const Chip8 = struct {
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cpu: Cpu,
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mem: [0x1000]u8,
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disp: Display,
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pub fn fromFile(alloc: *Allocator, scheduler: *Scheduler, path: []const u8) !Chip8 {
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const file = try std.fs.cwd().openFile(path, .{ .read = true });
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defer file.close();
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// Read file into allocated buffer
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const size = try file.getEndPos();
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const rom_buf = try file.readToEndAlloc(alloc, size);
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defer alloc.free(rom_buf);
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var chip8 = Chip8{
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.cpu = Cpu.new(scheduler),
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.mem = [_]u8{0x00} ** 0x1000,
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.disp = Display.new(),
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};
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std.mem.copy(u8, chip8.mem[0x0200..], rom_buf); // Copy ROM
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std.mem.copy(u8, chip8.mem[0x50..0xA0], &FONT_SET); // Copy FONT_SET
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return chip8;
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}
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pub fn step(self: *Chip8) u64 {
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return cpu.step(&self.cpu, &self.disp, &self.mem);
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}
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pub fn getDisplay(self: *Chip8) *const Display {
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return &self.disp;
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}
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};
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