changed variables

5 files changed, 271 insertions, 0 deletions

diff --git a/src/crepe/api/CMakeLists.txt b/src/crepe/api/CMakeLists.txt
index 3b20142..e7894d7 100644
--- a/src/crepe/api/CMakeLists.txt
+++ b/src/crepe/api/CMakeLists.txt
@@ -16,6 +16,8 @@ target_sources(crepe PUBLIC
 	Scene.cpp
 	SceneManager.cpp
 	Vector2.cpp
+	LoopManager.cpp
+	LoopTimer.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -38,4 +40,6 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	Metadata.h
 	SceneManager.h
 	SceneManager.hpp
+	LoopManager.h
+	LoopTimer.h
 )
diff --git a/src/crepe/api/LoopManager.cpp b/src/crepe/api/LoopManager.cpp
new file mode 100644
index 0000000..746e9ce
--- /dev/null
+++ b/src/crepe/api/LoopManager.cpp
@@ -0,0 +1,61 @@
+
+
+#include "../system/RenderSystem.h"
+#include "../system/ScriptSystem.h"
+
+#include "LoopManager.h"
+#include "LoopTimer.h"
+
+namespace crepe {
+
+void LoopManager::process_input() {
+    SDLContext::get_instance().handle_events(this->gameRunning);
+}
+void LoopManager::start(){
+    this->setup();
+    this->loop();
+}
+void LoopManager::set_running(bool running) { this->gameRunning = running; }
+
+void LoopManager::fixed_update() {
+}
+
+void LoopManager::loop() {
+    LoopTimer & timer = LoopTimer::getInstance();
+    timer.start();
+
+    while (gameRunning) {
+        timer.update();
+
+        while (timer.get_lag() >= timer.get_fixed_delta_time()) {
+            process_input();
+            fixed_update();
+            timer.advance_fixed_update();
+        }
+
+        update();
+        render();
+
+        timer.enforce_frame_rate();
+    }
+}
+
+
+void LoopManager::setup() {
+    this->gameRunning = true;
+    LoopTimer::getInstance().start();
+    LoopTimer::getInstance().set_fps(60);
+}
+
+void LoopManager::render() {
+    if (gameRunning) {
+        RenderSystem::get_instance().update();
+    }
+}
+
+void LoopManager::update() {
+    LoopTimer & timer = LoopTimer::getInstance();
+    ScriptSystem::get_instance().update();
+}
+
+} // namespace crepe
diff --git a/src/crepe/api/LoopManager.h b/src/crepe/api/LoopManager.h
new file mode 100644
index 0000000..a5c88c3
--- /dev/null
+++ b/src/crepe/api/LoopManager.h
@@ -0,0 +1,66 @@
+#pragma once
+
+namespace crepe {
+
+class LoopManager {
+    public:
+        void start();
+
+    private:
+        /**
+         * \brief Setup function for one-time initialization.
+         *
+         * This function initializes necessary components for the game.
+         */
+        void setup();
+        /**
+         * \brief Main game loop function.
+         *
+         * This function runs the main loop, handling game updates and rendering.
+         */
+        void loop();
+
+        /**
+         * \brief Function for handling input-related system calls.
+         *
+         * Processes user inputs from keyboard and mouse.
+         */
+        void process_input();
+
+        /**
+         * \brief Per-frame update.
+         *
+         * Updates the game state based on the elapsed time since the last frame.
+         */
+        void update();
+
+        /**
+         * \brief Late update which is called after update().
+         *
+         * This function can be used for final adjustments before rendering.
+         */
+        void late_update();
+
+        /**
+         * \brief Fixed update executed at a fixed rate.
+         *
+         * This function updates physics and game logic based on LoopTimer's fixed_delta_time.
+         */
+        void fixed_update();
+        /**
+         * \brief Set game running variable
+         *
+         * \param running running (false = game shutdown, true = game running)
+         */
+        void set_running(bool running);
+        /**
+         * \brief Function for executing render-related systems.
+         *
+         * Renders the current state of the game to the screen.
+         */
+        void render();
+
+        bool gameRunning = false;
+    };
+
+} // namespace crepe
diff --git a/src/crepe/api/LoopTimer.cpp b/src/crepe/api/LoopTimer.cpp
new file mode 100644
index 0000000..5e432fc
--- /dev/null
+++ b/src/crepe/api/LoopTimer.cpp
@@ -0,0 +1,59 @@
+
+#include "../facade/SDLContext.h"
+
+#include "api/LoopTimer.h"
+
+
+using namespace crepe;
+LoopTimer::LoopTimer() {}
+
+LoopTimer & LoopTimer::getInstance() {
+    static LoopTimer instance;
+    return instance;
+}
+
+void LoopTimer::start() {
+    last_frame_time = SDLContext::get_instance().get_ticks();
+    elapsed_time = 0;
+    elapsed_fixed_time = 0;
+    delta_time = 0;
+}
+
+void LoopTimer::update() {
+    uint64_t current_frame_time = SDLContext::get_instance().get_ticks();
+    delta_time = (current_frame_time - last_frame_time) / 1000.0;
+
+    if (delta_time > maximum_delta_time) {
+        delta_time = maximum_delta_time;
+    }
+    delta_time = game_scale;
+    elapsed_time += delta_time;
+    last_frame_time = current_frame_time;
+}
+
+double LoopTimer::get_delta_time() const { return delta_time; }
+int LoopTimer::get_current_time() const { return elapsed_time; }
+
+void LoopTimer::advance_fixed_update() { elapsed_fixed_time += fixed_delta_time; }
+
+double LoopTimer::get_fixed_delta_time() const { return fixed_delta_time; }
+
+void LoopTimer::set_fps(int fps) {
+    this->fps = fps;
+    frame_target_time = 1.0 / fps;
+}
+
+int LoopTimer::get_fps() const { return fps; }
+void LoopTimer::set_game_scale(double value) { game_scale = value; };
+double LoopTimer::get_game_scale() const { return game_scale; }
+void LoopTimer::enforce_frame_rate() {
+    uint64_t current_frame_time = SDLContext::get_instance().get_ticks();
+    double frame_duration = (current_frame_time - last_frame_time) / 1000.0;
+
+    if (frame_duration < frame_target_time) {
+        uint32_t delay_time
+            = (uint32_t) ((frame_target_time - frame_duration) / 1000.0);
+        SDLContext::get_instance().delay(delay_time);
+    }
+}
+double LoopTimer::get_lag() const { return elapsed_time - elapsed_fixed_time; }
diff --git a/src/crepe/api/LoopTimer.h b/src/crepe/api/LoopTimer.h
new file mode 100644
index 0000000..584a408
--- /dev/null
+++ b/src/crepe/api/LoopTimer.h
@@ -0,0 +1,81 @@
+#pragma once
+
+#include <cstdint>
+
+namespace crepe{
+class LoopTimer {
+public:
+/**
+ * \brief Get the singleton instance of LoopTimer.
+ *
+ * \return A reference to the LoopTimer instance.
+ */
+static LoopTimer& getInstance();
+
+/**
+ * \brief Get the current delta time for the current frame.
+ *
+ * \return Delta time in seconds since the last frame.
+ */
+double get_delta_time() const;
+
+/**
+ * \brief Get the current game time.
+ *
+ * \note The current game time may vary from the real-world elapsed time.
+ * It is the cumulative sum of each frame's delta time.
+ *
+ * \return Elapsed game time in milliseconds.
+ */
+int get_current_time() const;
+
+/**
+ * \brief Set the target frames per second (FPS).
+ *
+ * \param fps The number of frames that should be rendered per second.
+ */
+void set_fps(int fps);
+
+/**
+ * \brief Get the current frames per second (FPS).
+ *
+ * \return Current FPS.
+ */
+int get_fps() const;
+
+/**
+ * \brief Get the current game scale.
+ *
+ * \return The current game scale, where 0 = paused, 1 = normal speed, and values > 1 speed up the game.
+ */
+double get_game_scale() const;
+
+/**
+ * \brief Set the game scale.
+ *
+ * \param game_scale The desired game scale (0 = pause, 1 = normal speed, > 1 = speed up).
+ */
+void set_game_scale(double game_scale);
+
+private:
+friend class LoopManager;
+void start();
+void enforce_frame_rate();
+double get_fixed_delta_time() const;
+double get_lag() const;
+LoopTimer();
+void update();
+void advance_fixed_update();
+private:
+int fps = 50;                       ///< Current frames per second
+double game_scale = 1;              ///< Current game scale
+double maximum_delta_time = 0.25;   ///< Maximum delta time to avoid large jumps
+double delta_time = 0;              ///< Delta time for the current frame
+double frame_target_time = 1.0 / fps; ///< Target time per frame in seconds
+double fixed_delta_time = 0.02;     ///< Fixed delta time for fixed updates
+double elapsed_time = 0;             ///< Total elapsed game time
+double elapsed_fixed_time = 0;      ///< Total elapsed time for fixed updates
+uint64_t last_frame_time = 0;       ///< Time of the last frame
+};
+
+} // namespace crepe::api