paoda/zba
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

feat(config): add support for (and read from) TOML config file

Browse Source
This commit is contained in:
Rekai Nyangadzayi Musuka
2022-10-12 18:40:38 -03:00
parent 622f479e07
commit 293fbd9f55
7 changed files with 120 additions and 82 deletions
Download Patch File Download Diff File Expand all files Collapse all files

63
src/core/emu.zig
View File

@@ -1,5 +1,6 @@
const std = @import("std");
const SDL = @import("sdl2");
const config = @import("../config.zig");
const Bus = @import("Bus.zig");
const Scheduler = @import("scheduler.zig").Scheduler;
@@ -12,14 +13,6 @@ const Thread = std.Thread;
const Atomic = std.atomic.Atomic;
const Allocator = std.mem.Allocator;
// TODO: Move these to a TOML File
const sync_audio = false; // Enable Audio Sync
const sync_video: RunKind = .LimitedFPS; // Configure Video Sync
pub const win_scale = 4; // 1x, 2x, 3x, etc. Window Scaling
pub const cpu_logging = false; // Enable detailed CPU logging
pub const allow_unhandled_io = true; // Only relevant in Debug Builds
pub const force_rtc = false;
// 228 Lines which consist of 308 dots (which are 4 cycles long)
const cycles_per_frame: u64 = 228 * (308 * 4); //280896
const clock_rate: u64 = 1 << 24; // 16.78MHz
@@ -40,18 +33,20 @@ const RunKind = enum {
UnlimitedFPS,
Limited,
LimitedFPS,
LimitedBusy,
};
pub fn run(quit: *Atomic(bool), fps: *FpsTracker, sched: *Scheduler, cpu: *Arm7tdmi) void {
if (sync_audio) log.info("Audio sync enabled", .{});
if (config.config().guest.audio_sync) log.info("Audio sync enabled", .{});
switch (sync_video) {
.Unlimited => runUnsynchronized(quit, sched, cpu, null),
.Limited => runSynchronized(quit, sched, cpu, null),
.UnlimitedFPS => runUnsynchronized(quit, sched, cpu, fps),
.LimitedFPS => runSynchronized(quit, sched, cpu, fps),
.LimitedBusy => runBusyLoop(quit, sched, cpu),
// TODO: Support the other modes?
const video_sync: RunKind = if (config.config().guest.video_sync) .LimitedFPS else .UnlimitedFPS;
const audio_sync = config.config().guest.audio_sync;
switch (video_sync) {
.Unlimited => runUnsynchronized(audio_sync, quit, sched, cpu, null),
.Limited => runSynchronized(audio_sync, quit, sched, cpu, null),
.UnlimitedFPS => runUnsynchronized(audio_sync, quit, sched, cpu, fps),
.LimitedFPS => runSynchronized(audio_sync, quit, sched, cpu, fps),
}
}
@@ -72,7 +67,7 @@ pub fn runFrame(sched: *Scheduler, cpu: *Arm7tdmi) void {
}
}
fn syncToAudio(stream: *SDL.SDL_AudioStream, is_buffer_full: *bool) void {
fn syncToAudio(audio_sync: bool, stream: *SDL.SDL_AudioStream, is_buffer_full: *bool) void {
const sample_size = 2 * @sizeOf(u16);
const max_buf_size: c_int = 0x400;
@@ -85,11 +80,11 @@ fn syncToAudio(stream: *SDL.SDL_AudioStream, is_buffer_full: *bool) void {
while (true) {
still_full = SDL.SDL_AudioStreamAvailable(stream) > sample_size * max_buf_size >> 1;
if (!sync_audio or !still_full) break;
if (!audio_sync or !still_full) break;
}
}
pub fn runUnsynchronized(quit: *Atomic(bool), sched: *Scheduler, cpu: *Arm7tdmi, fps: ?*FpsTracker) void {
pub fn runUnsynchronized(audio_sync: bool, quit: *Atomic(bool), sched: *Scheduler, cpu: *Arm7tdmi, fps: ?*FpsTracker) void {
log.info("Emulation thread w/out video sync", .{});
if (fps) |tracker| {
@@ -97,19 +92,19 @@ pub fn runUnsynchronized(quit: *Atomic(bool), sched: *Scheduler, cpu: *Arm7tdmi,
while (!quit.load(.SeqCst)) {
runFrame(sched, cpu);
syncToAudio(cpu.bus.apu.stream, &cpu.bus.apu.is_buffer_full);
syncToAudio(audio_sync, cpu.bus.apu.stream, &cpu.bus.apu.is_buffer_full);
tracker.tick();
}
} else {
while (!quit.load(.SeqCst)) {
runFrame(sched, cpu);
syncToAudio(cpu.bus.apu.stream, &cpu.bus.apu.is_buffer_full);
syncToAudio(audio_sync, cpu.bus.apu.stream, &cpu.bus.apu.is_buffer_full);
}
}
}
pub fn runSynchronized(quit: *Atomic(bool), sched: *Scheduler, cpu: *Arm7tdmi, fps: ?*FpsTracker) void {
pub fn runSynchronized(audio_sync: bool, quit: *Atomic(bool), sched: *Scheduler, cpu: *Arm7tdmi, fps: ?*FpsTracker) void {
log.info("Emulation thread w/ video sync", .{});
var timer = Timer.start() catch std.debug.panic("Failed to initialize std.timer.Timer", .{});
var wake_time: u64 = frame_period;
@@ -125,8 +120,8 @@ pub fn runSynchronized(quit: *Atomic(bool), sched: *Scheduler, cpu: *Arm7tdmi, f
// If we happen to also be syncing to audio, we choose to spin on
// the amount of time needed for audio to catch up rather than
// our expected wake-up time
syncToAudio(cpu.bus.apu.stream, &cpu.bus.apu.is_buffer_full);
if (!sync_audio) spinLoop(&timer, wake_time);
syncToAudio(audio_sync, cpu.bus.apu.stream, &cpu.bus.apu.is_buffer_full);
if (!audio_sync) spinLoop(&timer, wake_time);
wake_time = new_wake_time;
tracker.tick();
@@ -137,8 +132,8 @@ pub fn runSynchronized(quit: *Atomic(bool), sched: *Scheduler, cpu: *Arm7tdmi, f
const new_wake_time = blockOnVideo(&timer, wake_time);
// see above comment
syncToAudio(cpu.bus.apu.stream, &cpu.bus.apu.is_buffer_full);
if (!sync_audio) spinLoop(&timer, wake_time);
syncToAudio(audio_sync, cpu.bus.apu.stream, &cpu.bus.apu.is_buffer_full);
if (!audio_sync) spinLoop(&timer, wake_time);
wake_time = new_wake_time;
}
}
@@ -153,22 +148,6 @@ inline fn blockOnVideo(timer: *Timer, wake_time: u64) u64 {
return if (maybe_recalc_wake_time) |recalc| recalc else wake_time + frame_period;
}
pub fn runBusyLoop(quit: *Atomic(bool), sched: *Scheduler, cpu: *Arm7tdmi) void {
log.info("Emulation thread with video sync using busy loop", .{});
var timer = Timer.start() catch unreachable;
var wake_time: u64 = frame_period;
while (!quit.load(.SeqCst)) {
runFrame(sched, cpu);
spinLoop(&timer, wake_time);
syncToAudio(cpu.bus.apu.stream, &cpu.bus.apu.is_buffer_full);
// Update to the new wake time
wake_time += frame_period;
}
}
fn sleep(timer: *Timer, wake_time: u64) ?u64 {
// const step = std.time.ns_per_ms * 10; // 10ms
const timestamp = timer.read();