From 149b3b5dbc8b18a142bf35869e54ab05e8f26d54 Mon Sep 17 00:00:00 2001
From: WBoerenkamps <wrj.boerenkamps@student.avans.nl>
Date: Mon, 11 Nov 2024 20:21:31 +0100
Subject: added chrono::duration

---
 src/crepe/api/LoopTimer.cpp | 90 +++++++++++++++++++++++++++------------------
 1 file changed, 55 insertions(+), 35 deletions(-)

(limited to 'src/crepe/api/LoopTimer.cpp')

diff --git a/src/crepe/api/LoopTimer.cpp b/src/crepe/api/LoopTimer.cpp
index 16d813f..039e35e 100644
--- a/src/crepe/api/LoopTimer.cpp
+++ b/src/crepe/api/LoopTimer.cpp
@@ -1,3 +1,4 @@
+#include <chrono>
 
 #include "../facade/SDLContext.h"
 #include "../util/log.h"
@@ -6,64 +7,83 @@
 
 using namespace crepe;
 
-LoopTimer::LoopTimer() { dbg_trace(); }
+LoopTimer::LoopTimer() {
+    dbg_trace();
+}
 
 LoopTimer & LoopTimer::get_instance() {
-	static LoopTimer instance;
-	return instance;
+    static LoopTimer instance;
+    return instance;
 }
 
 void LoopTimer::start() {
-	this->last_frame_time = SDLContext::get_instance().get_ticks();
-	this->elapsed_time = 0;
-	this->elapsed_fixed_time = 0;
-	this->delta_time = 0;
+    this->last_frame_time = std::chrono::steady_clock::now();
+    this->elapsed_time = std::chrono::milliseconds(0);
+    this->elapsed_fixed_time = std::chrono::milliseconds(0);
+    this->delta_time = std::chrono::milliseconds(0);
 }
 
 void LoopTimer::update() {
-	uint64_t current_frame_time = SDLContext::get_instance().get_ticks();
-	this->delta_time = (current_frame_time - last_frame_time);
-
-	if (this->delta_time > this->maximum_delta_time) {
-		this->delta_time = this->maximum_delta_time;
-	}
-	this->delta_time *= this->game_scale;
-	this->elapsed_time += this->delta_time;
-	this->last_frame_time = current_frame_time;
+    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->delta_time *= this->game_scale;
+    this->elapsed_time += this->delta_time;
+    this->last_frame_time = current_frame_time;
+}
+
+double LoopTimer::get_delta_time() const {
+    return this->delta_time.count();
+}
+
+double LoopTimer::get_current_time() const {
+    return this->elapsed_time.count();
 }
 
-double LoopTimer::get_delta_time() const { return this->delta_time; }
-double LoopTimer::get_current_time() const { return this->elapsed_time; }
 void LoopTimer::advance_fixed_update() {
-	this->elapsed_fixed_time += this->fixed_delta_time;
+    this->elapsed_fixed_time += this->fixed_delta_time;
 }
+
 double LoopTimer::get_fixed_delta_time() const {
-	return this->fixed_delta_time;
+    return this->fixed_delta_time.count();
 }
 
 void LoopTimer::set_fps(int fps) {
-	this->fps = fps;
-	//! use fps to calculate frame_target_time in ms
-	this->frame_target_time = 1000.0 / this->fps;
+    this->fps = fps;
+	// target time per frame in seconds
+    this->frame_target_time = std::chrono::seconds(1) / fps; 
+}
+
+int LoopTimer::get_fps() const {
+    return this->fps;
 }
 
-int LoopTimer::get_fps() const { return this->fps; }
-void LoopTimer::set_game_scale(double value) { this->game_scale = value; }
-double LoopTimer::get_game_scale() const { return this->game_scale; }
+void LoopTimer::set_game_scale(double value) {
+    this->game_scale = value;
+}
 
+double LoopTimer::get_game_scale() const {
+    return this->game_scale;
+}
 void LoopTimer::enforce_frame_rate() {
-	uint64_t current_frame_time = SDLContext::get_instance().get_ticks();
-	double frame_duration = (current_frame_time - this->last_frame_time);
+    std::chrono::steady_clock::time_point current_frame_time = std::chrono::steady_clock::now();
+    std::chrono::milliseconds frame_duration = std::chrono::duration_cast<std::chrono::milliseconds>(current_frame_time - this->last_frame_time);
 
-	if (frame_duration < this->frame_target_time) {
-		uint32_t delay_time
-			= static_cast<uint32_t>(this->frame_target_time - frame_duration);
-		SDLContext::get_instance().delay(delay_time);
-	}
+    if (frame_duration < this->frame_target_time) {
+        std::chrono::milliseconds delay_time = std::chrono::duration_cast<std::chrono::milliseconds>(this->frame_target_time - frame_duration);
+        if (delay_time.count() > 0) {
+            SDLContext::get_instance().delay(delay_time.count());
+        }
+    }
 
-	this->last_frame_time = current_frame_time;
+    this->last_frame_time = current_frame_time;
 }
 
 double LoopTimer::get_lag() const {
-	return this->elapsed_time - this->elapsed_fixed_time;
+    return (this->elapsed_time - this->elapsed_fixed_time).count();
 }
-- 
cgit v1.2.3