15 files changed, 470 insertions, 0 deletions
diff --git a/mwe/gameloop/CMakeLists.txt b/mwe/gameloop/CMakeLists.txt
new file mode 100644
index 0000000..6bc5017
--- /dev/null
+++ b/mwe/gameloop/CMakeLists.txt
@@ -0,0 +1,28 @@
+cmake_minimum_required(VERSION 3.5)
+project(gameloop)
+
+# Set the C++ standard (optional, but good practice)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
+
+# Find the SDL2 package
+find_package(SDL2 REQUIRED)
+
+# Add your executable
+set(SOURCES
+	src/loopManager
+    src/window.cpp
+    src/main.cpp
+	src/eventManager.cpp
+	src/gameObject.cpp
+	src/timer.cpp
+)
+
+add_executable(gameloop ${SOURCES})
+
+# Link the SDL2 library to your project
+target_link_libraries(gameloop ${SDL2_LIBRARIES})
+
+# Include SDL2 header files and project headers
+target_include_directories(gameloop PRIVATE ${SDL2_INCLUDE_DIRS})
+target_include_directories(gameloop PRIVATE ${CMAKE_SOURCE_DIR}/include)
diff --git a/mwe/gameloop/imgs/demo.bmp b/mwe/gameloop/imgs/demo.bmp
new file mode 100644
index 0000000..65354fe
--- /dev/null
+++ b/mwe/gameloop/imgs/demo.bmp
diff --git a/mwe/gameloop/imgs/demo.jpg b/mwe/gameloop/imgs/demo.jpg
new file mode 100644
index 0000000..f534e1b
--- /dev/null
+++ b/mwe/gameloop/imgs/demo.jpg
diff --git a/mwe/gameloop/include/eventManager.h b/mwe/gameloop/include/eventManager.h
new file mode 100644
index 0000000..2aa0a68
--- /dev/null
+++ b/mwe/gameloop/include/eventManager.h
@@ -0,0 +1,4 @@
+class EventManager
+{
+
+};
diff --git a/mwe/gameloop/include/gameObject.h b/mwe/gameloop/include/gameObject.h
new file mode 100644
index 0000000..0e17991
--- /dev/null
+++ b/mwe/gameloop/include/gameObject.h
@@ -0,0 +1,29 @@
+#pragma once
+#include <iostream>
+class GameObject {
+	public:
+		GameObject();
+		GameObject(std::string name, float x, float y, float width, float height, float velX, float velY);
+		std::string getName() const;
+		float getX() const;
+		float getY() const;
+		float getWidth() const;
+		float getHeight() const;
+		float getVelX() const;
+		float getVelY() const;
+		void setName(std::string value);
+		void setX(float value);
+		void setY(float value);
+		void setWidth(float value);
+		void setHeight(float value);
+		void setVelX(float value);
+		void setVelY(float value);
+	private:
+		std::string name = "";
+		float x = 0;
+		float y = 0;
+		float width = 0;
+		float height = 0;
+		float velX = 0;
+		float velY = 0;
+};
diff --git a/mwe/gameloop/include/loopManager.h b/mwe/gameloop/include/loopManager.h
new file mode 100644
index 0000000..06bcd5f
--- /dev/null
+++ b/mwe/gameloop/include/loopManager.h
@@ -0,0 +1,25 @@
+#pragma once
+#include <SDL2/SDL.h>
+#include "window.h"
+#include "gameObject.h"
+class LoopManager{
+	public:
+		LoopManager();
+		void setup();
+		void loop();
+	private:
+		
+		std::vector<GameObject*> objectList;
+		void processInput();
+		void update();
+		void lateUpdate();
+		void fixedUpdate();
+		void render();
+		bool gameRunning = false;
+		WindowManager window;
+		int timeScale = 1;
+		float accumulator = 0.0;
+		double currentTime;
+		double t = 0.0;
+		double dt = 0.01;
+};
diff --git a/mwe/gameloop/include/timer.h b/mwe/gameloop/include/timer.h
new file mode 100644
index 0000000..a245e5c
--- /dev/null
+++ b/mwe/gameloop/include/timer.h
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <SDL2/SDL.h>
+
+class LoopTimer {
+public:
+    static LoopTimer& getInstance();
+    void start();
+    void update();
+    double getDeltaTime() const;
+    int getCurrentTime() const;
+	void advanceFixedUpdate();
+	double getFixedDeltaTime() const;
+    void setFPS(int FPS);
+    int getFPS() const;
+    void enforceFrameRate();
+	double getLag() const;
+private:
+    LoopTimer();
+	int FPS = 50;
+	double gameScale = 1;
+	double maximumDeltaTime = 0.25;
+    double deltaTime;
+	double frameTargetTime = FPS / 1000;
+    double fixedDeltaTime = 0.01;
+    double elapsedTime;
+    double elapsedFixedTime;
+	double time;
+    uint64_t lastFrameTime;
+};
diff --git a/mwe/gameloop/include/window.h b/mwe/gameloop/include/window.h
new file mode 100644
index 0000000..cfde0e9
--- /dev/null
+++ b/mwe/gameloop/include/window.h
@@ -0,0 +1,20 @@
+#pragma once
+#include <SDL2/SDL.h>
+#include <vector>
+#include "gameObject.h"
+#include <iostream>
+class WindowManager{
+	public:
+		WindowManager();
+		virtual ~WindowManager();
+		void render(std::vector<GameObject*> objects);
+		bool initWindow();
+		void destroyWindow();
+		
+		SDL_Renderer* getRenderer();
+	private:
+		const int SCREEN_WIDTH = 800;
+		const int SCREEN_HEIGHT = 600;
+		SDL_Window* window = NULL;
+		SDL_Renderer* renderer = NULL;
+};
diff --git a/mwe/gameloop/src/eventManager.cpp b/mwe/gameloop/src/eventManager.cpp
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/mwe/gameloop/src/eventManager.cpp
diff --git a/mwe/gameloop/src/gameObject.cpp b/mwe/gameloop/src/gameObject.cpp
new file mode 100644
index 0000000..f637314
--- /dev/null
+++ b/mwe/gameloop/src/gameObject.cpp
@@ -0,0 +1,58 @@
+#include "gameObject.h"
+std::string GameObject::getName() const{
+	return name;
+}
+float GameObject::getX() const{
+    return x;
+}
+
+float GameObject::getY() const{
+    return y;
+}
+
+float GameObject::getWidth() const{
+    return width;
+}
+
+float GameObject::getHeight() const{
+    return height;
+}
+
+float GameObject::getVelX() const{
+    return velX;
+}
+
+float GameObject::getVelY() const{
+    return velY;
+}
+void GameObject::setName(std::string value){
+	name = value;
+}
+void GameObject::setX(float value){
+    x = value;
+}
+
+void GameObject::setY(float value){
+    y = value;
+}
+
+void GameObject::setWidth(float value){
+    width = value;
+}
+
+void GameObject::setHeight(float value){
+    height = value;
+}
+
+void GameObject::setVelX(float value){
+    velX = value;
+}
+
+void GameObject::setVelY(float value){
+    velY = value;
+}
+
+GameObject::GameObject(std::string name, float x, float y, float width, float height, float velX, float velY)
+    : name(name),x(x), y(y), width(width), height(height), velX(velX), velY(velY) {
+
+	}
diff --git a/mwe/gameloop/src/loopManager.cpp b/mwe/gameloop/src/loopManager.cpp
new file mode 100644
index 0000000..f7ce886
--- /dev/null
+++ b/mwe/gameloop/src/loopManager.cpp
@@ -0,0 +1,72 @@
+#include "loopManager.h"
+#include "timer.h"
+LoopManager::LoopManager(){
+}
+void LoopManager::processInput(){
+	SDL_Event event;
+	SDL_PollEvent(&event);
+	switch(event.type){
+		case SDL_QUIT:
+			gameRunning = false;
+			break;
+		case SDL_KEYDOWN:
+			if(event.key.keysym.sym == SDLK_ESCAPE){
+				gameRunning = false;
+			}
+		break;
+	}
+}
+void LoopManager::fixedUpdate(){
+	fprintf(stderr,"fixed update\n");
+}
+void LoopManager::loop() {
+    LoopTimer& timer = LoopTimer::getInstance();
+    timer.start();
+
+    while (gameRunning) {
+        timer.update();
+
+        while (timer.getLag() >= timer.getFixedDeltaTime()) {
+            processInput();
+            fixedUpdate();
+            timer.advanceFixedUpdate();
+        }
+
+        update();
+        render();
+
+        timer.enforceFrameRate();
+    }
+
+    window.destroyWindow();
+}
+
+void LoopManager::setup(){
+	gameRunning = window.initWindow();
+	LoopTimer::getInstance().start();
+	LoopTimer::getInstance().setFPS(50);
+	
+	for(int i = 0; i < 2;i++){
+		GameObject* square = new GameObject("square2",i*40,i*40,20,20,0,0);
+		objectList.push_back(square);
+	}
+}
+void LoopManager::render(){
+	fprintf(stderr,"**********render********** \n");
+	if(gameRunning){
+		window.render(objectList);
+	}
+}
+
+void LoopManager::update() {
+	fprintf(stderr,"**********normal update********** \n");
+    LoopTimer& timer = LoopTimer::getInstance();
+	
+    float delta= timer.getDeltaTime();
+
+    for (int i = 0; i < objectList.size(); i++) {
+        objectList[i]->setX(objectList[i]->getX() + 50 * delta); 
+        objectList[i]->setY(objectList[i]->getY() + 50 * delta);
+    }
+}
+
diff --git a/mwe/gameloop/src/main.cpp b/mwe/gameloop/src/main.cpp
new file mode 100644
index 0000000..2333e63
--- /dev/null
+++ b/mwe/gameloop/src/main.cpp
@@ -0,0 +1,19 @@
+//Using SDL and standard IO
+#include <SDL2/SDL.h>
+#include <stdio.h>
+//#include "window.h"
+#include "loopManager.h"
+#include "timer.h"
+//Screen dimension constants
+
+
+//Starts up SDL and creates window
+
+int main( int argc, char* args[] )
+{
+	LoopManager gameLoop;
+	gameLoop.setup();
+	gameLoop.loop();
+
+	return 0;
+}
diff --git a/mwe/gameloop/src/timer.cpp b/mwe/gameloop/src/timer.cpp
new file mode 100644
index 0000000..1e3045f
--- /dev/null
+++ b/mwe/gameloop/src/timer.cpp
@@ -0,0 +1,68 @@
+#include "timer.h"
+
+// Constructor (private)
+LoopTimer::LoopTimer(){}
+
+// Get the singleton instance of the timer
+LoopTimer& LoopTimer::getInstance() {
+    static LoopTimer instance;
+    return instance;
+}
+
+// Start the timer (initialize frame time)
+void LoopTimer::start() {
+    lastFrameTime = SDL_GetTicks64();
+    elapsedTime = 0;
+    elapsedFixedTime = 0;
+    deltaTime = 0;
+}
+
+// Update the timer, calculate deltaTime
+void LoopTimer::update() {
+    uint64_t currentFrameTime = SDL_GetTicks64();
+    deltaTime = (currentFrameTime - lastFrameTime) / 1000.0;  // Convert to seconds
+
+    if (deltaTime > maximumDeltaTime) {
+        deltaTime = maximumDeltaTime;
+    }
+
+    elapsedTime += deltaTime;
+    lastFrameTime = currentFrameTime;
+}
+
+double LoopTimer::getDeltaTime() const {
+    return deltaTime;
+}
+int LoopTimer::getCurrentTime() const {
+    return SDL_GetTicks();
+}
+
+void LoopTimer::advanceFixedUpdate() {
+    elapsedFixedTime += fixedDeltaTime;
+}
+
+double LoopTimer::getFixedDeltaTime() const {
+    return fixedDeltaTime;
+}
+
+void LoopTimer::setFPS(int FPS) {
+    this->FPS = FPS;
+    frameTargetTime = 1.0 / FPS;
+}
+
+int LoopTimer::getFPS() const {
+    return FPS;
+}
+
+void LoopTimer::enforceFrameRate() {
+    uint64_t currentFrameTime = SDL_GetTicks64();
+    double frameDuration = (currentFrameTime - lastFrameTime) / 1000.0;
+
+    if (frameDuration < frameTargetTime) {
+        uint32_t delayTime = (uint32_t)((frameTargetTime - frameDuration) * 1000.0);
+        SDL_Delay(delayTime);
+    }
+}
+double LoopTimer::getLag() const {
+    return elapsedTime - elapsedFixedTime;
+}
diff --git a/mwe/gameloop/src/window.cpp b/mwe/gameloop/src/window.cpp
new file mode 100644
index 0000000..f998a79
--- /dev/null
+++ b/mwe/gameloop/src/window.cpp
@@ -0,0 +1,60 @@
+#include "window.h"
+WindowManager::WindowManager(){
+	if( !initWindow() )
+	{
+		printf( "Failed to initialize!\n" );
+	}
+}
+WindowManager::~WindowManager(){
+	destroyWindow();
+}
+SDL_Renderer* WindowManager::getRenderer(){
+	return renderer;
+}
+
+void WindowManager::render(std::vector<GameObject*> objects){
+    // Set the draw color to black and clear the screen
+    SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
+    SDL_RenderClear(renderer);
+
+    // Print object position (optional for debugging)
+   	//fprintf(stderr, "%d\n", objectList.size());
+	for(int i = 0; i < objects.size();i++){
+		 //fprintf(stderr, "%f\n", objectList[i]->getX());
+		// Create a rectangle representing the ball
+		SDL_Rect ball_rect = {
+			(int)objects[i]->getX(),
+			(int)objects[i]->getY(),
+			(int)objects[i]->getWidth(),
+			(int)objects[i]->getHeight(),
+		};
+		// Set the draw color to white and render the ball
+		SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
+		SDL_RenderFillRect(renderer, &ball_rect);
+	}
+    
+    SDL_RenderPresent(renderer);
+}
+
+bool WindowManager::initWindow(){
+	if(SDL_Init(SDL_INIT_EVERYTHING) !=  0){
+		fprintf(stderr,"Error inititalising SDL.\n");
+		return false;
+	} 
+	window = SDL_CreateWindow( "SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN );
+	if(!window){
+		fprintf(stderr,"Error creating SDL Window. \n");
+		return false;
+	}
+	renderer = SDL_CreateRenderer(window,-1,0);
+	if(!renderer){
+		fprintf(stderr,"Error creating SDL renderer. \n");
+		return false;
+	}
+	return true;
+}
+void WindowManager::destroyWindow(){
+	SDL_DestroyRenderer(renderer);
+	SDL_DestroyWindow(window);
+	SDL_Quit();
+}
diff --git a/mwe/gameloop/versions/delayBased.cpp b/mwe/gameloop/versions/delayBased.cpp
new file mode 100644
index 0000000..a8cad15
--- /dev/null
+++ b/mwe/gameloop/versions/delayBased.cpp
@@ -0,0 +1,57 @@
+#include "loopManager.h"
+#include "timer.h"
+LoopManager::LoopManager(){
+}
+void LoopManager::processInput(){
+	SDL_Event event;
+	SDL_PollEvent(&event);
+	switch(event.type){
+		case SDL_QUIT:
+			gameRunning = false;
+			break;
+		case SDL_KEYDOWN:
+			if(event.key.keysym.sym == SDLK_ESCAPE){
+				gameRunning = false;
+			}
+		break;
+	}
+}
+void LoopManager::loop(){
+	fprintf(stderr,"loop. \n");
+	while(gameRunning){
+		//Timer::getInstance().update();
+        //deltaTime = Timer::getInstance().getDeltaTime();
+		processInput();
+		update();
+		render();
+	}
+	window.destroyWindow();
+}
+void LoopManager::setup(){
+	gameRunning = window.initWindow();
+	LoopTimer::getInstance().start();
+	LoopTimer::getInstance().setFPS(210);
+	
+	for(int i = 0; i < 2;i++){
+		GameObject* square2 = new GameObject("square2",i*40,i*40,20,20,0,0);
+		objectList.push_back(square2);
+	}
+}
+void LoopManager::render(){
+	if(gameRunning){
+		window.render(objectList);
+	}
+}
+
+void LoopManager::update() {
+    LoopTimer& timer = LoopTimer::getInstance();
+    timer.enforceFrameRate();
+    timer.update();
+    float delta= timer.getDeltaTime();
+
+    for (int i = 0; i < objectList.size(); i++) {
+        objectList[i]->setX(objectList[i]->getX() + 50 * delta); 
+        objectList[i]->setY(objectList[i]->getY() + 50 * delta);
+    }
+}
+