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fix: improve frame limiting and fps counting

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-03-16 21:25:32 -03:00
parent 40968f0990
commit 1921218c7b
2 changed files with 36 additions and 40 deletions
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61
src/emu.zig
View File

@ -3,6 +3,7 @@ const std = @import("std");
const Bus = @import("Bus.zig");
const Scheduler = @import("scheduler.zig").Scheduler;
const Arm7tdmi = @import("cpu.zig").Arm7tdmi;
const FpsAverage = @import("util.zig").FpsAverage;
const Timer = std.time.Timer;
const Thread = std.Thread;
@ -24,13 +25,13 @@ const RunKind = enum {
LimitedBusy,
};
pub fn run(kind: RunKind, quit: *Atomic(bool), pause: *Atomic(bool), fps: *Atomic(u64), sched: *Scheduler, cpu: *Arm7tdmi, bus: *Bus) void {
pub fn run(kind: RunKind, quit: *Atomic(bool), fps: *FpsAverage, sched: *Scheduler, cpu: *Arm7tdmi, bus: *Bus) void {
switch (kind) {
.Unlimited => runUnSync(quit, pause, sched, cpu, bus),
.Limited => runSync(quit, pause, sched, cpu, bus),
.UnlimitedFPS => runUnSyncFps(quit, pause, fps, sched, cpu, bus),
.LimitedFPS => runSyncFps(quit, pause, fps, sched, cpu, bus),
.LimitedBusy => runBusyLoop(quit, pause, sched, cpu, bus),
.Unlimited => runUnSync(quit, sched, cpu, bus),
.Limited => runSync(quit, sched, cpu, bus),
.UnlimitedFPS => runUnSyncFps(quit, fps, sched, cpu, bus),
.LimitedFPS => runSyncFps(quit, fps, sched, cpu, bus),
.LimitedBusy => runBusyLoop(quit, sched, cpu, bus),
}
}
@ -46,17 +47,17 @@ pub fn runFrame(sched: *Scheduler, cpu: *Arm7tdmi, bus: *Bus) void {
}
}
pub fn runUnSync(quit: *Atomic(bool), pause: *Atomic(bool), sched: *Scheduler, cpu: *Arm7tdmi, bus: *Bus) void {
pub fn runUnSync(quit: *Atomic(bool), sched: *Scheduler, cpu: *Arm7tdmi, bus: *Bus) void {
log.info("Unsynchronized EmuThread has begun", .{});
while (!quit.load(.Unordered)) if (!pause.load(.Unordered)) runFrame(sched, cpu, bus);
while (!quit.load(.Unordered)) runFrame(sched, cpu, bus);
}
pub fn runSync(quit: *Atomic(bool), pause: *Atomic(bool), sched: *Scheduler, cpu: *Arm7tdmi, bus: *Bus) void {
pub fn runSync(quit: *Atomic(bool), sched: *Scheduler, cpu: *Arm7tdmi, bus: *Bus) void {
log.info("Synchronized EmuThread has begun", .{});
var timer = Timer.start() catch unreachable;
var wake_time: u64 = frame_period;
while (!quit.load(.Unordered)) if (!pause.load(.Unordered)) {
while (!quit.load(.Unordered)) {
runFrame(sched, cpu, bus);
// Put the Thread to Sleep + Backup Spin Loop
@ -65,26 +66,26 @@ pub fn runSync(quit: *Atomic(bool), pause: *Atomic(bool), sched: *Scheduler, cpu
// Update to the new wake time
wake_time += frame_period;
};
}
}
pub fn runUnSyncFps(quit: *Atomic(bool), pause: *Atomic(bool), fps: *Atomic(u64), sched: *Scheduler, cpu: *Arm7tdmi, bus: *Bus) void {
pub fn runUnSyncFps(quit: *Atomic(bool), fps: *FpsAverage, sched: *Scheduler, cpu: *Arm7tdmi, bus: *Bus) void {
log.info("Unsynchronized EmuThread with FPS Tracking has begun", .{});
var fps_timer = Timer.start() catch unreachable;
while (!quit.load(.Unordered)) if (!pause.load(.Unordered)) {
while (!quit.load(.Unordered)) {
runFrame(sched, cpu, bus);
fps.store(emuFps(fps_timer.lap()), .Unordered);
};
fps.add(emuFps(fps_timer.lap()));
}
}
pub fn runSyncFps(quit: *Atomic(bool), pause: *Atomic(bool), fps: *Atomic(u64), sched: *Scheduler, cpu: *Arm7tdmi, bus: *Bus) void {
pub fn runSyncFps(quit: *Atomic(bool), fps: *FpsAverage, sched: *Scheduler, cpu: *Arm7tdmi, bus: *Bus) void {
log.info("Synchronized EmuThread has begun", .{});
var timer = Timer.start() catch unreachable;
var fps_timer = Timer.start() catch unreachable;
var wake_time: u64 = frame_period;
while (!quit.load(.Unordered)) if (!pause.load(.Unordered)) {
while (!quit.load(.Unordered)) {
runFrame(sched, cpu, bus);
// Put the Thread to Sleep + Backup Spin Loop
@ -92,29 +93,29 @@ pub fn runSyncFps(quit: *Atomic(bool), pause: *Atomic(bool), fps: *Atomic(u64),
sleep(&timer, &wake_time);
// Determine FPS
fps.store(emuFps(fps_timer.lap()), .Unordered);
fps.add(emuFps(fps_timer.lap()));
// Update to the new wake time
wake_time += frame_period;
};
}
}
pub fn runBusyLoop(quit: *Atomic(bool), pause: *Atomic(bool), sched: *Scheduler, cpu: *Arm7tdmi, bus: *Bus) void {
pub fn runBusyLoop(quit: *Atomic(bool), sched: *Scheduler, cpu: *Arm7tdmi, bus: *Bus) void {
log.info("Run EmuThread with spin-loop sync", .{});
var timer = Timer.start() catch unreachable;
var wake_time: u64 = frame_period;
while (!quit.load(.Unordered)) if (!pause.load(.Unordered)) {
while (!quit.load(.Unordered)) {
runFrame(sched, cpu, bus);
spinLoop(&timer, wake_time);
// Update to the new wake time
wake_time += frame_period;
};
}
}
fn sleep(timer: *Timer, wake_time: *u64) void {
const step = std.time.ns_per_ms * 10;
// const step = std.time.ns_per_ms * 10; // 10ms
const timestamp = timer.read();
// ns_late is non zero if we are late.
@ -130,13 +131,15 @@ fn sleep(timer: *Timer, wake_time: *u64) void {
const sleep_for = frame_period - ns_late;
// Employ several sleep calls in periods of 10ms
// By doing this the behaviour should average out to be
// more consistent
const loop_count = sleep_for / step; // How many groups of 10ms
// // Employ several sleep calls in periods of 10ms
// // By doing this the behaviour should average out to be
// // more consistent
// const loop_count = sleep_for / step; // How many groups of 10ms
var i: usize = 0;
while (i < loop_count) : (i += 1) std.time.sleep(step);
// var i: usize = 0;
// while (i < loop_count) : (i += 1) std.time.sleep(step);
std.time.sleep(sleep_for);
// Spin to make up the difference if there is a need
// Make sure that we're using the old wake time and not the onne we recalculated

15
src/main.zig
View File

@ -84,11 +84,10 @@ pub fn main() anyerror!void {
// Init Atomics
var quit = Atomic(bool).init(false);
var pause = Atomic(bool).init(false);
var emu_fps = Atomic(u64).init(0);
var emu_fps = FpsAverage.init();
// Create Emulator Thread
const emu_thread = try Thread.spawn(.{}, emu.run, .{ .LimitedFPS, &quit, &pause, &emu_fps, &scheduler, &cpu, &bus });
const emu_thread = try Thread.spawn(.{}, emu.run, .{ .UnlimitedFPS, &quit, &emu_fps, &scheduler, &cpu, &bus });
defer emu_thread.join();
// Initialize SDL
@ -119,8 +118,6 @@ pub fn main() anyerror!void {
// Init FPS Timer
var dyn_title_buf: [0x100]u8 = [_]u8{0x00} ** 0x100;
var fps_avg = FpsAverage.init();
emu_loop: while (true) {
var event: SDL.SDL_Event = undefined;
if (SDL.SDL_PollEvent(&event) != 0) {
@ -167,17 +164,13 @@ pub fn main() anyerror!void {
}
// FIXME: Is it OK just to copy the Emulator's Frame Buffer to SDL?
pause.store(true, .Unordered);
const buf_ptr = bus.ppu.framebuf.ptr;
_ = SDL.SDL_UpdateTexture(texture, null, buf_ptr, framebuf_pitch);
_ = SDL.SDL_RenderCopy(renderer, texture, null, null);
SDL.SDL_RenderPresent(renderer);
pause.store(false, .Unordered);
fps_avg.add(emu_fps.load(.Unordered));
const avg = fps_avg.calc();
const dyn_title = std.fmt.bufPrint(&dyn_title_buf, "{s} [Emu: {d:0>3}fps, {d:0>3}%] ", .{ title, avg, (avg * 100 / 60) }) catch unreachable;
const avg = emu_fps.calc();
const dyn_title = std.fmt.bufPrint(&dyn_title_buf, "{s} [Emu: {d:0>3}fps, {d:0>3}%] ", .{ title, avg, (avg * 100 / 59) }) catch unreachable;
SDL.SDL_SetWindowTitle(window, dyn_title.ptr);
}