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Merge pull request #36052 from Calinou/improve-low-processor-sleep

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Improve the low processor mode sleep precision
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Rémi Verschelde 2020-06-24 23:14:05 +02:00 committed by GitHub
commit 4dede9e644
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1 changed files with 23 additions and 11 deletions
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34
main/main.cpp
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@ -2266,25 +2266,37 @@ bool Main::iteration() {
return exit; return exit;
} }
if (OS::get_singleton()->is_in_low_processor_usage_mode() || !DisplayServer::get_singleton()->can_any_window_draw()) { const uint32_t frame_delay = Engine::get_singleton()->get_frame_delay();
OS::get_singleton()->delay_usec(OS::get_singleton()->get_low_processor_usage_mode_sleep_usec()); //apply some delay to force idle time if (frame_delay) {
} else { // Add fixed frame delay to decrease CPU/GPU usage. This doesn't take
uint32_t frame_delay = Engine::get_singleton()->get_frame_delay(); // the actual frame time into account.
if (frame_delay) { // Due to the high fluctuation of the actual sleep duration, it's not recommended
OS::get_singleton()->delay_usec(Engine::get_singleton()->get_frame_delay() * 1000); // to use this as a FPS limiter.
} OS::get_singleton()->delay_usec(frame_delay * 1000);
} }
int target_fps = Engine::get_singleton()->get_target_fps(); // Add a dynamic frame delay to decrease CPU/GPU usage. This takes the
// previous frame time into account for a smoother result.
uint64_t dynamic_delay = 0;
if (OS::get_singleton()->is_in_low_processor_usage_mode() || !DisplayServer::get_singleton()->window_can_draw()) {
dynamic_delay = OS::get_singleton()->get_low_processor_usage_mode_sleep_usec();
}
const int target_fps = Engine::get_singleton()->get_target_fps();
if (target_fps > 0 && !Engine::get_singleton()->is_editor_hint()) { if (target_fps > 0 && !Engine::get_singleton()->is_editor_hint()) {
uint64_t time_step = 1000000L / target_fps; // Override the low processor usage mode sleep delay if the target FPS is lower.
target_ticks += time_step; dynamic_delay = MAX(dynamic_delay, (uint64_t)(1000000 / target_fps));
}
if (dynamic_delay > 0) {
target_ticks += dynamic_delay;
uint64_t current_ticks = OS::get_singleton()->get_ticks_usec(); uint64_t current_ticks = OS::get_singleton()->get_ticks_usec();
if (current_ticks < target_ticks) { if (current_ticks < target_ticks) {
OS::get_singleton()->delay_usec(target_ticks - current_ticks); OS::get_singleton()->delay_usec(target_ticks - current_ticks);
} }
current_ticks = OS::get_singleton()->get_ticks_usec(); current_ticks = OS::get_singleton()->get_ticks_usec();
target_ticks = MIN(MAX(target_ticks, current_ticks - time_step), current_ticks + time_step); target_ticks = MIN(MAX(target_ticks, current_ticks - dynamic_delay), current_ticks + dynamic_delay);
} }
#ifdef TOOLS_ENABLED #ifdef TOOLS_ENABLED