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#include <chrono>
#include <thread>
#include "../util/Log.h"
#include "LoopTimerManager.h"
using namespace crepe;
using namespace std::chrono_literals;
LoopTimerManager::LoopTimerManager(Mediator & mediator) : Manager(mediator) {
this->mediator.loop_timer = *this;
dbg_trace();
}
void LoopTimerManager::start() {
this->last_frame_time = std::chrono::steady_clock::now();
this->elapsed_time = 0s;
// by starting the elapsed_fixed_time at (0 - fixed_delta_time) in milliseconds it calls a fixed update at the start of the loop.
this->elapsed_fixed_time
= -std::chrono::duration_cast<ElapsedTime_t>(this->fixed_delta_time);
this->delta_time = 0s;
}
void LoopTimerManager::update() {
TimePoint_t current_frame_time = std::chrono::steady_clock::now();
// Convert to duration in seconds for delta time
this->delta_time = current_frame_time - last_frame_time;
if (this->delta_time > this->maximum_delta_time) {
this->delta_time = this->maximum_delta_time;
}
if (this->delta_time > 0s) {
this->actual_fps = 1.0 / this->delta_time.count();
} else {
this->actual_fps = 0;
}
this->elapsed_time += std::chrono::duration_cast<ElapsedTime_t>(this->delta_time);
this->last_frame_time = current_frame_time;
}
Duration_t LoopTimerManager::get_delta_time() const {
return this->delta_time * this->time_scale;
}
ElapsedTime_t LoopTimerManager::get_elapsed_time() const { return this->elapsed_time; }
void LoopTimerManager::advance_fixed_elapsed_time() {
this->elapsed_fixed_time
+= std::chrono::duration_cast<ElapsedTime_t>(this->fixed_delta_time);
}
void LoopTimerManager::set_target_framerate(unsigned fps) {
this->target_fps = fps;
//check if fps is lower or equals 0
if (fps <= 0) return;
// target time per frame in seconds
this->frame_target_time = Duration_t(1s) / this->target_fps;
}
unsigned LoopTimerManager::get_fps() const { return this->actual_fps; }
void LoopTimerManager::set_time_scale(double value) { this->time_scale = value; }
float LoopTimerManager::get_time_scale() const { return this->time_scale; }
void LoopTimerManager::enforce_frame_rate() {
TimePoint_t current_frame_time = std::chrono::steady_clock::now();
Duration_t frame_duration = current_frame_time - this->last_frame_time;
// Check if frame duration is less than the target frame time
if (frame_duration < this->frame_target_time) {
std::chrono::microseconds delay_time
= std::chrono::duration_cast<std::chrono::microseconds>(this->frame_target_time
- frame_duration);
if (delay_time.count() > 0) {
std::this_thread::sleep_for(delay_time);
}
}
}
Duration_t LoopTimerManager::get_lag() const {
return (this->elapsed_time - this->elapsed_fixed_time);
}
Duration_t LoopTimerManager::get_scaled_fixed_delta_time() const {
return this->fixed_delta_time * this->time_scale;
}
void LoopTimerManager::set_fixed_delta_time(float seconds) {
this->fixed_delta_time = Duration_t(seconds);
}
Duration_t LoopTimerManager::get_fixed_delta_time() const { return this->fixed_delta_time; }
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