From 98d0350edb295ace107b22787e511f766e55fe04 Mon Sep 17 00:00:00 2001
From: Benedikt Galbavy <if22b082@technikum-wien.at>
Date: Thu, 11 Jan 2024 17:08:35 +0100
Subject: [PATCH] Implemented texture caching

---
 include/SpriteComponent.h |  4 ++--
 include/TextureManager.h  | 33 +++++++++++++++++++++++++++++++--
 src/GameObject.cpp        |  2 +-
 src/TextureManager.cpp    |  9 ++++++++-
 4 files changed, 42 insertions(+), 6 deletions(-)

diff --git a/include/SpriteComponent.h b/include/SpriteComponent.h
index 7e538bf..9a5667c 100644
--- a/include/SpriteComponent.h
+++ b/include/SpriteComponent.h
@@ -19,7 +19,7 @@ class SpriteComponent : public Component
 
 		void setTexture(const char* path)
 		{
-			this->texture = TextureManager::loadTexture(path);
+			this->texture = TextureManager::get().loadTexture(path);
 		}
 
 		void init() override
@@ -43,7 +43,7 @@ class SpriteComponent : public Component
 
 		void draw() override
 		{
-			TextureManager::draw(this->texture, this->srcRect, this->destRect);
+			TextureManager::get().draw(this->texture, this->srcRect, this->destRect);
 		}
 
 	private:
diff --git a/include/TextureManager.h b/include/TextureManager.h
index 83fbd63..85e6bbb 100644
--- a/include/TextureManager.h
+++ b/include/TextureManager.h
@@ -1,10 +1,39 @@
 #pragma once
 
 #include "Game.h"
+#include "SDL_render.h"
+#include <map>
+
+struct cmp_str
+{
+   bool operator()(char const *a, char const *b) const {
+      return strcmp(a, b) < 0;
+   }
+};
 
 class TextureManager
 {
-	public:
-		static SDL_Texture* loadTexture(const char* fileName);
+    public:
+        static TextureManager& get()
+        {
+            static TextureManager instance;
+            return instance;
+        }
+        
+    private:
+        TextureManager() {}
+        ~TextureManager() {
+        	for (auto& it : this->texture_cache) {
+        		SDL_DestroyTexture(it.second);
+        	}
+        }
+
+    public:
+        TextureManager(TextureManager const&) = delete;
+        void operator=(TextureManager const&) = delete;
+
+        std::map<const char*, SDL_Texture*, cmp_str> texture_cache;
+
+		SDL_Texture* loadTexture(const char* fileName);
 		static void draw(SDL_Texture* texture, SDL_Rect src, SDL_Rect dest);
 };
\ No newline at end of file
diff --git a/src/GameObject.cpp b/src/GameObject.cpp
index 84df9c1..8d61ac7 100644
--- a/src/GameObject.cpp
+++ b/src/GameObject.cpp
@@ -3,7 +3,7 @@
 
 GameObject::GameObject(const char* texturesheet, int x, int y)
 {
-	this->objTexture = TextureManager::loadTexture(texturesheet);
+	this->objTexture = TextureManager::get().loadTexture(texturesheet);
 	this->xPos = x;
 	this->yPos = y;
 }
diff --git a/src/TextureManager.cpp b/src/TextureManager.cpp
index 93fc3e3..a3e0d85 100644
--- a/src/TextureManager.cpp
+++ b/src/TextureManager.cpp
@@ -1,8 +1,15 @@
 #include "TextureManager.h"
+#include <cstdio>
 
 SDL_Texture* TextureManager::loadTexture(const char* fileName)
 {
-	return IMG_LoadTexture(Game::renderer, fileName);
+	auto it = this->texture_cache.find(fileName);
+	if (it != this->texture_cache.end()) {
+		return it->second;
+	}
+	auto texture = IMG_LoadTexture(Game::renderer, fileName);
+	this->texture_cache.emplace(fileName, texture);
+	return texture;
 }
 
 void TextureManager::draw(SDL_Texture* texture, SDL_Rect src, SDL_Rect dest)