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#include <chrono>
#include <thread>
#include "../facade/SDLContext.h"
#include "../util/Log.h"
#include "LoopTimerManager.h"
using namespace crepe;
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 = std::chrono::milliseconds(0);
// 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<std::chrono::milliseconds>(fixed_delta_time);
this->delta_time = std::chrono::milliseconds(0);
}
void LoopTimerManager::update() {
auto current_frame_time = std::chrono::steady_clock::now();
// Convert to duration in seconds for delta time
this->delta_time = std::chrono::duration_cast<std::chrono::duration<double>>(
current_frame_time - last_frame_time);
if (this->delta_time > this->maximum_delta_time) {
this->delta_time = this->maximum_delta_time;
}
this->actual_fps = 1.0 / this->delta_time.count();
this->elapsed_time += this->delta_time;
this->last_frame_time = current_frame_time;
}
double LoopTimerManager::get_delta_time() const { return this->delta_time.count() * this->time_scale; }
double LoopTimerManager::get_current_time() const { return this->elapsed_time.count(); }
void LoopTimerManager::advance_fixed_update() { this->elapsed_fixed_time += this->fixed_delta_time; }
double LoopTimerManager::get_fixed_delta_time() const { return this->fixed_delta_time.count(); }
void LoopTimerManager::set_target_fps(int fps) {
this->target_fps = fps;
// target time per frame in seconds
this->frame_target_time = std::chrono::duration<double>(1.0) / this->target_fps;
}
int LoopTimerManager::get_fps() const { return this->actual_fps; }
void LoopTimerManager::set_time_scale(double value) { this->time_scale = value; }
double LoopTimerManager::get_time_scale() const { return this->time_scale; }
void LoopTimerManager::enforce_frame_rate() {
auto current_frame_time = std::chrono::steady_clock::now();
auto 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) {
auto 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);
}
}
}
double LoopTimerManager::get_lag() const {
return (this->elapsed_time - this->elapsed_fixed_time).count();
}
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