233 lines
7.5 KiB
Zig
233 lines
7.5 KiB
Zig
const std = @import("std");
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const builtin = @import("builtin");
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const Log2Int = std.math.Log2Int;
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const Arm7tdmi = @import("core/cpu.zig").Arm7tdmi;
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const allow_unhandled_io = @import("core/emu.zig").allow_unhandled_io;
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// Sign-Extend value of type `T` to type `U`
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pub fn sext(comptime T: type, comptime U: type, value: T) T {
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// U must have less bits than T
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comptime std.debug.assert(@typeInfo(U).Int.bits <= @typeInfo(T).Int.bits);
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const iT = std.meta.Int(.signed, @typeInfo(T).Int.bits);
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const ExtU = if (@typeInfo(U).Int.signedness == .unsigned) T else iT;
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const shift = @intCast(Log2Int(T), @typeInfo(T).Int.bits - @typeInfo(U).Int.bits);
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return @bitCast(T, @bitCast(iT, @as(ExtU, @truncate(U, value)) << shift) >> shift);
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}
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/// See https://godbolt.org/z/W3en9Eche
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pub inline fn rotr(comptime T: type, x: T, r: anytype) T {
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if (@typeInfo(T).Int.signedness == .signed)
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@compileError("cannot rotate signed integer");
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const ar = @intCast(Log2Int(T), @mod(r, @typeInfo(T).Int.bits));
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return x >> ar | x << (1 +% ~ar);
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}
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pub const FpsTracker = struct {
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const Self = @This();
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fps: u32,
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count: std.atomic.Atomic(u32),
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timer: std.time.Timer,
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pub fn init() Self {
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return .{
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.fps = 0,
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.count = std.atomic.Atomic(u32).init(0),
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.timer = std.time.Timer.start() catch unreachable,
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};
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}
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pub fn tick(self: *Self) void {
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_ = self.count.fetchAdd(1, .Monotonic);
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}
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pub fn value(self: *Self) u32 {
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if (self.timer.read() >= std.time.ns_per_s) {
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self.fps = self.count.swap(0, .SeqCst);
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self.timer.reset();
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}
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return self.fps;
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}
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};
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pub fn intToBytes(comptime T: type, value: anytype) [@sizeOf(T)]u8 {
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comptime std.debug.assert(@typeInfo(T) == .Int);
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var result: [@sizeOf(T)]u8 = undefined;
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var i: Log2Int(T) = 0;
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while (i < result.len) : (i += 1) result[i] = @truncate(u8, value >> i * @bitSizeOf(u8));
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return result;
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}
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/// The Title from the GBA Cartridge is an Uppercase ASCII string which is
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/// null-padded to 12 bytes
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///
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/// This function returns a slice of the ASCII string without the null terminator(s)
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/// (essentially, a proper Zig/Rust/Any modern language String)
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pub fn span(title: *const [12]u8) []const u8 {
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const end = std.mem.indexOfScalar(u8, title, '\x00');
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return title[0 .. end orelse title.len];
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}
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test "span" {
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var example: *const [12]u8 = "POKEMON_EMER";
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try std.testing.expectEqualSlices(u8, "POKEMON_EMER", span(example));
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example = "POKEMON_EME\x00";
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try std.testing.expectEqualSlices(u8, "POKEMON_EME", span(example));
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example = "POKEMON_EM\x00\x00";
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try std.testing.expectEqualSlices(u8, "POKEMON_EM", span(example));
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example = "POKEMON_E\x00\x00\x00";
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try std.testing.expectEqualSlices(u8, "POKEMON_E", span(example));
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example = "POKEMON_\x00\x00\x00\x00";
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try std.testing.expectEqualSlices(u8, "POKEMON_", span(example));
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example = "POKEMON\x00\x00\x00\x00\x00";
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try std.testing.expectEqualSlices(u8, "POKEMON", span(example));
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example = "POKEMO\x00\x00\x00\x00\x00\x00";
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try std.testing.expectEqualSlices(u8, "POKEMO", span(example));
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example = "POKEM\x00\x00\x00\x00\x00\x00\x00";
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try std.testing.expectEqualSlices(u8, "POKEM", span(example));
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example = "POKE\x00\x00\x00\x00\x00\x00\x00\x00";
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try std.testing.expectEqualSlices(u8, "POKE", span(example));
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example = "POK\x00\x00\x00\x00\x00\x00\x00\x00\x00";
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try std.testing.expectEqualSlices(u8, "POK", span(example));
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example = "PO\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
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try std.testing.expectEqualSlices(u8, "PO", span(example));
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example = "P\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
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try std.testing.expectEqualSlices(u8, "P", span(example));
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example = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
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try std.testing.expectEqualSlices(u8, "", span(example));
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}
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/// Creates a copy of a title with all Filesystem-invalid characters replaced
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///
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/// e.g. POKEPIN R/S to POKEPIN R_S
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pub fn escape(title: [12]u8) [12]u8 {
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var ret: [12]u8 = title;
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//TODO: Add more replacements
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std.mem.replaceScalar(u8, &ret, '/', '_');
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std.mem.replaceScalar(u8, &ret, '\\', '_');
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return ret;
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}
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pub const FilePaths = struct {
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rom: []const u8,
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bios: ?[]const u8,
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save: ?[]const u8,
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};
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pub const io = struct {
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pub const read = struct {
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pub fn todo(comptime log: anytype, comptime format: []const u8, args: anytype) u8 {
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log.debug(format, args);
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return 0;
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}
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pub fn undef(comptime T: type, log: anytype, comptime format: []const u8, args: anytype) ?T {
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log.warn(format, args);
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if (builtin.mode == .Debug and !allow_unhandled_io) std.debug.panic("TODO: Implement I/O Register", .{});
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return null;
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}
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};
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pub const write = struct {
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pub fn undef(log: anytype, comptime format: []const u8, args: anytype) void {
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log.warn(format, args);
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if (builtin.mode == .Debug and !allow_unhandled_io) std.debug.panic("TODO: Implement I/O Register", .{});
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}
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};
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};
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pub fn readUndefined(log: anytype, comptime format: []const u8, args: anytype) u8 {
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log.warn(format, args);
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if (builtin.mode == .Debug) std.debug.panic("TODO: Implement I/O Register", .{});
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return 0;
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}
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pub fn writeUndefined(log: anytype, comptime format: []const u8, args: anytype) void {
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log.warn(format, args);
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if (builtin.mode == .Debug) std.debug.panic("TODO: Implement I/O Register", .{});
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}
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pub const Logger = struct {
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const Self = @This();
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buf: std.io.BufferedWriter(4096 << 2, std.fs.File.Writer),
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pub fn init(file: std.fs.File) Self {
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return .{
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.buf = .{ .unbuffered_writer = file.writer() },
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};
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}
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pub fn print(self: *Self, comptime format: []const u8, args: anytype) !void {
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try self.buf.writer().print(format, args);
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}
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pub fn mgbaLog(self: *Self, cpu: *const Arm7tdmi, opcode: u32) void {
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const fmt_base = "{X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} {X:0>8} cpsr: {X:0>8} | ";
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const thumb_fmt = fmt_base ++ "{X:0>4}:\n";
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const arm_fmt = fmt_base ++ "{X:0>8}:\n";
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if (cpu.cpsr.t.read()) {
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if (opcode >> 11 == 0x1E) {
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// Instruction 1 of a BL Opcode, print in ARM mode
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const low = cpu.bus.dbgRead(u16, cpu.r[15]);
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const bl_opcode = @as(u32, opcode) << 16 | low;
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self.print(arm_fmt, Self.fmtArgs(cpu, bl_opcode)) catch @panic("failed to write to log file");
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} else {
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self.print(thumb_fmt, Self.fmtArgs(cpu, opcode)) catch @panic("failed to write to log file");
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}
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} else {
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self.print(arm_fmt, Self.fmtArgs(cpu, opcode)) catch @panic("failed to write to log file");
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}
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}
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fn fmtArgs(cpu: *const Arm7tdmi, opcode: u32) FmtArgTuple {
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return .{
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cpu.r[0],
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cpu.r[1],
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cpu.r[2],
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cpu.r[3],
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cpu.r[4],
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cpu.r[5],
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cpu.r[6],
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cpu.r[7],
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cpu.r[8],
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cpu.r[9],
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cpu.r[10],
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cpu.r[11],
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cpu.r[12],
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cpu.r[13],
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cpu.r[14],
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cpu.r[15],
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cpu.cpsr.raw,
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opcode,
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};
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}
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};
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const FmtArgTuple = std.meta.Tuple(&.{ u32, u32, u32, u32, u32, u32, u32, u32, u32, u32, u32, u32, u32, u32, u32, u32, u32, u32 });
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