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Merge pull request #840 from FearlessTobi/port-3353

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Port #3353 from Citra: "citra-qt: Add customizable speed limit target "
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bunnei 2018-08-22 01:19:50 -04:00 • committed by GitHub
commit cea627b0fc
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10 changed files with 94 additions and 25 deletions
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17
src/core/perf_stats.cpp
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@ -78,20 +78,29 @@ void FrameLimiter::DoFrameLimiting(microseconds current_system_time_us) {
// values increase the time needed to recover and limit framerate again after spikes.
constexpr microseconds MAX_LAG_TIME_US = 25000us;
if (!Settings::values.toggle_framelimit) {
if (!Settings::values.use_frame_limit) {
return;
}
auto now = Clock::now();
frame_limiting_delta_err += current_system_time_us - previous_system_time_us;
const double sleep_scale = Settings::values.frame_limit / 100.0;
// Max lag caused by slow frames. Shouldn't be more than the length of a frame at the current
// speed percent or it will clamp too much and prevent this from properly limiting to that
// percent. High values means it'll take longer after a slow frame to recover and start
// limiting
const microseconds max_lag_time_us = duration_cast<microseconds>(
std::chrono::duration<double, std::chrono::microseconds::period>(25ms / sleep_scale));
frame_limiting_delta_err += duration_cast<microseconds>(
std::chrono::duration<double, std::chrono::microseconds::period>(
(current_system_time_us - previous_system_time_us) / sleep_scale));
frame_limiting_delta_err -= duration_cast<microseconds>(now - previous_walltime);
frame_limiting_delta_err =
std::clamp(frame_limiting_delta_err, -MAX_LAG_TIME_US, MAX_LAG_TIME_US);
std::clamp(frame_limiting_delta_err, -max_lag_time_us, max_lag_time_us);
if (frame_limiting_delta_err > microseconds::zero()) {
std::this_thread::sleep_for(frame_limiting_delta_err);
auto now_after_sleep = Clock::now();
frame_limiting_delta_err -= duration_cast<microseconds>(now_after_sleep - now);
now = now_after_sleep;