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citra-qt: Add customizable speed limit target (#3353)

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citra-qt: Add customizable speed limit target

* Update SDL config for the new frame_limit option
* Made max lag time a function of target speed percent.
* Added a checkbox to enable/disable frame limiter
* UI: Prevent frame_limit from under/overflowing
* UI: Hide target speed percent when frame limiter is off
* Disable frame limit spin box when framelimit isn't enabled
This commit is contained in:
James Rowe 2018-01-25 22:24:40 -07:00 • committed by GitHub
parent 33b0b5163f
commit b002511df0
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GPG key ID: 4AEE18F83AFDEB23
12 changed files with 155 additions and 96 deletions
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19
src/core/perf_stats.cpp
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@ -75,24 +75,27 @@ double PerfStats::GetLastFrameTimeScale() {
}
void FrameLimiter::DoFrameLimiting(u64 current_system_time_us) {
// Max lag caused by slow frames. Can be adjusted to compensate for too many slow frames. Higher
// values increase the time needed to recover and limit framerate again after spikes.
constexpr microseconds MAX_LAG_TIME_US = 25ms;
if (!Settings::values.toggle_framelimit) {
if (!Settings::values.use_frame_limit) {
return;
}
auto now = Clock::now();
double sleep_scale = Settings::values.frame_limit / 100.0;
frame_limiting_delta_err += microseconds(current_system_time_us - previous_system_time_us);
// 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 =
MathUtil::Clamp(frame_limiting_delta_err, -MAX_LAG_TIME_US, MAX_LAG_TIME_US);
MathUtil::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;