merge with niels/rendering

25 files changed, 699 insertions, 29 deletions

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 446433c..b60a0cd 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -8,6 +8,7 @@ set(CMAKE_BUILD_TYPE Debug)
 project(crepe C CXX)
 
 find_package(SDL2 REQUIRED)
+find_package(SDL2_image REQUIRED)
 find_package(SoLoud REQUIRED)
 find_package(GTest REQUIRED)
 
@@ -20,7 +21,8 @@ target_include_directories(crepe
 
 target_link_libraries(crepe
 	PRIVATE soloud
-	PRIVATE SDL2
+	PUBLIC SDL2
+	PUBLIC SDL2_image
 )
 
 add_subdirectory(crepe)
diff --git a/src/build.sh b/src/build.sh
new file mode 100755
index 0000000..05d086c
--- /dev/null
+++ b/src/build.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+# creates the build dir and runs CMake with Ninja 
+cmake -B build -G Ninja
+
+ninja -C build
+
+ninja -C build/ rendering
+ninja -C build/ asset_manager
diff --git a/src/crepe/Asset.cpp b/src/crepe/Asset.cpp
index 15ddc27..3cbed0b 100644
--- a/src/crepe/Asset.cpp
+++ b/src/crepe/Asset.cpp
@@ -5,7 +5,8 @@
 using namespace crepe;
 
 Asset::Asset(const std::string & src) {
-	this->src = std::filesystem::canonical(src);
+	//this->src = std::filesystem::canonical(src);
+	this->src = src;
 	this->file = std::ifstream(this->src, std::ios::in | std::ios::binary);
 }
 
diff --git a/src/crepe/CMakeLists.txt b/src/crepe/CMakeLists.txt
index df3adf0..afaa74c 100644
--- a/src/crepe/CMakeLists.txt
+++ b/src/crepe/CMakeLists.txt
@@ -12,6 +12,8 @@ target_sources(crepe PUBLIC
 	PhysicsSystem.cpp
 	CollisionSystem.cpp
 	Collider.cpp
+	SdlContext.cpp
+	RenderSystem.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -29,6 +31,8 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	PhysicsSystem.h
 	CollisionSystem.h
 	Collider.h
+	SdlContext.h
+	RenderSystem.h
 )
 
 add_subdirectory(api)
diff --git a/src/crepe/GameObject.hpp b/src/crepe/GameObject.hpp
new file mode 100644
index 0000000..8cd1abe
--- /dev/null
+++ b/src/crepe/GameObject.hpp
@@ -0,0 +1,15 @@
+#pragma once
+
+#include "GameObject.h"
+
+#include "ComponentManager.h"
+
+namespace crepe {
+
+template <typename T, typename... Args>
+T & GameObject::add_component(Args &&... args) {
+	auto & mgr = ComponentManager::get_instance();
+	return mgr.add_component<T>(id, std::forward<Args>(args)...);
+}
+
+} // namespace crepe
diff --git a/src/crepe/RenderSystem.cpp b/src/crepe/RenderSystem.cpp
new file mode 100644
index 0000000..6aae3bb
--- /dev/null
+++ b/src/crepe/RenderSystem.cpp
@@ -0,0 +1,41 @@
+
+
+#include "RenderSystem.h"
+#include "ComponentManager.h"
+#include "SdlContext.h"
+#include "api/Sprite.h"
+#include "api/Transform.h"
+#include "util/log.h"
+#include <cstddef>
+#include <functional>
+#include <vector>
+
+using namespace crepe;
+using namespace crepe::api;
+
+RenderSystem::RenderSystem() { dbg_trace(); }
+
+RenderSystem::~RenderSystem() { dbg_trace(); }
+
+RenderSystem& RenderSystem::get_instance(){
+	static RenderSystem instance;
+	return instance;
+}
+
+void RenderSystem::update() {
+
+	ComponentManager& mgr = ComponentManager::get_instance();
+	
+	std::vector<std::reference_wrapper<Sprite>> sprites = mgr.get_components_by_type<Sprite>();
+	std::vector<std::reference_wrapper<Transform>> transforms = mgr.get_components_by_type<Transform>();
+
+	SdlContext& render = SdlContext::get_instance();
+	render.clear_screen();
+
+	for (size_t i = 0; i < sprites.size(); ++i) {
+			render.draw(sprites[i].get(), transforms[i].get());
+	}
+
+	render.present_screen();
+
+}
diff --git a/src/crepe/RenderSystem.h b/src/crepe/RenderSystem.h
new file mode 100644
index 0000000..5e86dce
--- /dev/null
+++ b/src/crepe/RenderSystem.h
@@ -0,0 +1,18 @@
+
+#pragma once
+
+#include "System.h"
+
+namespace crepe {
+
+class RenderSystem : public System {
+
+public:
+	static RenderSystem & get_instance();
+	void update();
+
+private:
+	RenderSystem();
+	~RenderSystem();
+};
+} // namespace crepe
diff --git a/src/crepe/SdlContext.cpp b/src/crepe/SdlContext.cpp
new file mode 100644
index 0000000..cc5148c
--- /dev/null
+++ b/src/crepe/SdlContext.cpp
@@ -0,0 +1,149 @@
+
+
+#include "SdlContext.h"
+
+#include "api/Sprite.h"
+#include "api/Texture.h"
+#include "api/Transform.h"
+#include "util/log.h"
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_image.h>
+#include <SDL2/SDL_render.h>
+#include <SDL2/SDL_surface.h>
+#include <SDL2/SDL_video.h>
+#include <cmath>
+#include <cstddef>
+#include <iostream>
+
+using namespace crepe;
+
+SdlContext & SdlContext::get_instance() {
+	static SdlContext instance;
+	return instance;
+}
+
+void SdlContext::handle_events(bool & running) {
+	SDL_Event event;
+	while (SDL_PollEvent(&event)) {
+		if (event.type == SDL_QUIT) {
+			running = false;
+		}
+	}
+}
+
+SdlContext::~SdlContext() {
+	dbg_trace();
+
+	if (m_game_renderer != nullptr) SDL_DestroyRenderer(m_game_renderer);
+
+	if (m_game_window != nullptr) {
+		SDL_DestroyWindow(m_game_window);
+	}
+
+	IMG_Quit();
+	SDL_Quit();
+}
+
+void SdlContext::clear_screen() { SDL_RenderClear(this->m_game_renderer); }
+
+SdlContext::SdlContext() {
+	dbg_trace();
+
+	if (SDL_Init(SDL_INIT_VIDEO) < 0) {
+		std::cerr << "SDL could not initialize! SDL_Error: " << SDL_GetError()
+				  << std::endl;
+		return;
+	}
+
+	m_game_window = SDL_CreateWindow(
+		"Crepe Game Engine", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
+		1920, 1080, SDL_WINDOW_HIDDEN);
+	if (!m_game_window) {
+		std::cerr << "Window could not be created! SDL_Error: "
+				  << SDL_GetError() << std::endl;
+	}
+
+	m_game_renderer
+		= SDL_CreateRenderer(m_game_window, -1, SDL_RENDERER_ACCELERATED);
+	if (!m_game_renderer) {
+		std::cerr << "Renderer could not be created! SDL_Error: "
+				  << SDL_GetError() << std::endl;
+		SDL_DestroyWindow(m_game_window);
+		return;
+	}
+
+	int img_flags = IMG_INIT_PNG;
+	if (!(IMG_Init(img_flags) & img_flags)) {
+		std::cout << "SDL_image could not initialize! SDL_image Error: "
+				  << IMG_GetError() << std::endl;
+	}
+}
+void SdlContext::present_screen() { SDL_RenderPresent(this->m_game_renderer); }
+
+void SdlContext::draw(const api::Sprite & sprite,
+					  const api::Transform & transform) {
+
+	static SDL_RendererFlip render_flip
+		= (SDL_RendererFlip) ((SDL_FLIP_HORIZONTAL * sprite.flip.flip_x)
+							  | (SDL_FLIP_VERTICAL * sprite.flip.flip_y));
+
+	int w, h;
+	SDL_QueryTexture(sprite.sprite_image->m_texture, NULL, NULL, &w, &h);
+	// needs maybe camera for position
+	SDL_Rect dstrect = {
+		.x = static_cast<int>(transform.position.x),
+		.y = static_cast<int>(transform.position.y),
+		.w = static_cast<int>(w * transform.scale),
+		.h = static_cast<int>(h * transform.scale),
+	};
+	
+	double degrees = transform.rotation * 180 / M_PI;
+	SDL_RenderCopyEx(this->m_game_renderer, sprite.sprite_image->m_texture,
+					 NULL, &dstrect, degrees, NULL, render_flip);
+}
+
+/*
+SDL_Texture * SdlContext::setTextureFromPath(const char * path, SDL_Rect & clip,
+											 const int row, const int col) {
+	dbg_trace();
+
+	SDL_Surface * tmp = IMG_Load(path);
+	if (!tmp) {
+		std::cerr << "Error surface " << IMG_GetError << std::endl;
+	}
+
+	clip.
+		w = tmp->w / col;
+	clip.h = tmp->h / row;
+
+	SDL_Texture * CreatedTexture
+		= SDL_CreateTextureFromSurface(m_game_renderer, tmp);
+
+	if (!CreatedTexture) {
+		std::cerr << "Error could not create texture " << IMG_GetError
+				  << std::endl;
+	}
+	SDL_FreeSurface(tmp);
+
+	return CreatedTexture;
+}
+*/
+
+SDL_Texture * SdlContext::texture_from_path(const char * path) {
+	dbg_trace();
+	
+	SDL_Surface * tmp = IMG_Load(path);
+	if (!tmp) {
+		std::cerr << "Error surface " << IMG_GetError << std::endl;
+	}
+	SDL_Texture * created_texture
+		= SDL_CreateTextureFromSurface(m_game_renderer, tmp);
+
+	if (!created_texture) {
+		std::cerr << "Error could not create texture " << IMG_GetError
+				  << std::endl;
+	}
+	SDL_FreeSurface(tmp);
+
+	return created_texture;
+}
diff --git a/src/crepe/SdlContext.h b/src/crepe/SdlContext.h
new file mode 100644
index 0000000..97adfa2
--- /dev/null
+++ b/src/crepe/SdlContext.h
@@ -0,0 +1,50 @@
+#pragma once
+
+#include "RenderSystem.h"
+#include "api/Sprite.h"
+#include "api/Transform.h"
+#include <SDL2/SDL_render.h>
+#include <SDL2/SDL_video.h>
+
+namespace crepe::api {
+class Texture;
+}
+
+namespace crepe {
+
+class SdlContext {
+
+public:
+	// singleton
+	static SdlContext & get_instance();
+	SdlContext(const SdlContext &) = delete;
+	SdlContext(SdlContext &&) = delete;
+	SdlContext & operator=(const SdlContext &) = delete;
+	SdlContext & operator=(SdlContext &&) = delete;
+
+	//TODO decide events wouter?
+
+private:
+	void handle_events(bool & running);
+
+private:
+	SdlContext();
+	virtual ~SdlContext();
+
+private:
+	friend class api::Texture;
+	SDL_Texture * texture_from_path(const char *);
+	//SDL_Texture* setTextureFromPath(const char*, SDL_Rect& clip, const int row, const int col);
+
+private:
+	friend class RenderSystem;
+	void draw(const api::Sprite &, const api::Transform &);
+	void clear_screen();
+	void present_screen();
+
+private:
+	SDL_Window * m_game_window = nullptr;
+	SDL_Renderer * m_game_renderer = nullptr;
+};
+
+} // namespace crepe
diff --git a/src/crepe/api/AssetManager.cpp b/src/crepe/api/AssetManager.cpp
new file mode 100644
index 0000000..f6cc369
--- /dev/null
+++ b/src/crepe/api/AssetManager.cpp
@@ -0,0 +1,23 @@
+
+
+#include "AssetManager.h"
+#include "util/log.h"
+
+
+using namespace crepe::api;
+
+AssetManager& AssetManager::get_instance(){
+	static AssetManager instance;
+	return instance;
+}
+
+
+AssetManager::~AssetManager(){
+	dbg_trace();
+	this->asset_cache.clear();
+}
+
+AssetManager::AssetManager(){
+	dbg_trace();
+}
+
diff --git a/src/crepe/api/AssetManager.h b/src/crepe/api/AssetManager.h
new file mode 100644
index 0000000..1b8b86f
--- /dev/null
+++ b/src/crepe/api/AssetManager.h
@@ -0,0 +1,50 @@
+#pragma once
+
+
+
+#include <any>
+#include <memory>
+#include <string>
+#include <unordered_map>
+#include <utility>
+
+
+namespace crepe::api{
+
+class AssetManager{
+
+
+private:
+	std::unordered_map< std::string, std::any>  asset_cache;
+	
+private:
+	AssetManager();
+	virtual ~AssetManager();
+
+public:
+	AssetManager(const AssetManager &) = delete;
+	AssetManager(AssetManager &&) = delete;
+	AssetManager &operator=(const AssetManager &) = delete;
+	AssetManager &operator=(AssetManager &&) = delete;
+
+
+	static AssetManager& get_instance();
+
+
+public:
+	template<typename asset>
+	std::shared_ptr<asset> cache(const std::string& file_path, bool reload = false){
+		auto it = asset_cache.find(file_path);
+
+		if (!reload && it != asset_cache.end()) {
+			return std::any_cast<std::shared_ptr<asset>>(it->second);
+		}
+
+		std::shared_ptr<asset> new_asset = std::make_shared<asset>(file_path.c_str());
+
+		asset_cache[file_path] = new_asset;
+
+		return new_asset;
+	}
+};
+}
diff --git a/src/crepe/api/AudioSource.cpp b/src/crepe/api/AudioSource.cpp
index bb067dc..10b3b49 100644
--- a/src/crepe/api/AudioSource.cpp
+++ b/src/crepe/api/AudioSource.cpp
@@ -3,6 +3,7 @@
 #include "AudioSource.h"
 
 #include "../Sound.h"
+#include <memory>
 
 using namespace crepe::api;
 
diff --git a/src/crepe/api/CMakeLists.txt b/src/crepe/api/CMakeLists.txt
index ef01594..f6de96e 100644
--- a/src/crepe/api/CMakeLists.txt
+++ b/src/crepe/api/CMakeLists.txt
@@ -8,6 +8,9 @@ target_sources(crepe PUBLIC
 	Force.cpp
 	ParticleEmitter.cpp
 	Transform.cpp
+	Color.cpp
+	Texture.cpp
+	AssetManager.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -21,5 +24,8 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	Force.h
 	ParticleEmitter.h
 	Transform.h
+	Point.h
+	Color.h
+	Texture.h 
+	AssetManager.h 
 )
-
diff --git a/src/crepe/api/Color.cpp b/src/crepe/api/Color.cpp
new file mode 100644
index 0000000..c73ce6c
--- /dev/null
+++ b/src/crepe/api/Color.cpp
@@ -0,0 +1,53 @@
+
+
+#include "Color.h"
+
+
+using namespace crepe::api;
+
+Color Color::white 	= Color(255,255,255,0);
+Color Color::red 	= Color(255,0,0,0);
+Color Color::green 	= Color(0,255,0,0);
+Color Color::blue 	= Color(0,0,255,0);
+Color Color::black 	= Color(0,0,0,0);
+Color Color::cyan 	= Color(0,255,255,0);
+Color Color::yellow	= Color(255,255,0,0);
+Color Color::magenta= Color(255,0,255,0);
+
+Color::Color(double red, double green, double blue, double alpha){
+	this->a = alpha;
+	this->r = red;
+	this->g = green;
+	this->b = blue;
+};
+
+const Color& Color::get_white(){
+	return Color::white;
+};
+
+const Color& Color::get_red(){
+	return Color::red;
+};
+const Color& Color::get_green(){
+	return Color::green;
+};
+const Color& Color::get_blue(){
+	return Color::blue;
+};
+
+const Color& Color::get_black(){
+	return Color::black;
+};
+
+const Color& Color::get_cyan(){
+	return Color::cyan;
+};
+
+const Color& Color::get_yellow(){
+	return Color::yellow;
+};
+
+const Color& Color::get_magenta(){
+	return Color::magenta;
+};
+
diff --git a/src/crepe/api/Color.h b/src/crepe/api/Color.h
new file mode 100644
index 0000000..207434e
--- /dev/null
+++ b/src/crepe/api/Color.h
@@ -0,0 +1,34 @@
+#pragma once
+
+namespace crepe::api {
+
+class Color {
+
+public:
+	Color(double red, double green, double blue, double alpha);
+	static const Color & get_white();
+	static const Color & get_red();
+	static const Color & get_green();
+	static const Color & get_blue();
+	static const Color & get_cyan();
+	static const Color & get_magenta();
+	static const Color & get_yellow();
+	static const Color & get_black();
+
+private:
+	double r;
+	double g;
+	double b;
+	double a;
+
+	static Color white;
+	static Color red;
+	static Color green;
+	static Color blue;
+	static Color cyan;
+	static Color magenta;
+	static Color yellow;
+	static Color black;
+};
+
+} // namespace crepe::api
diff --git a/src/crepe/api/Point.h b/src/crepe/api/Point.h
new file mode 100644
index 0000000..463aa7c
--- /dev/null
+++ b/src/crepe/api/Point.h
@@ -0,0 +1,14 @@
+#pragma once
+
+
+
+namespace crepe::api {
+
+class Point {
+public:
+	double x;
+	double y;
+};
+
+
+}
diff --git a/src/crepe/api/Sprite.cpp b/src/crepe/api/Sprite.cpp
index 4eda466..d9e26ab 100644
--- a/src/crepe/api/Sprite.cpp
+++ b/src/crepe/api/Sprite.cpp
@@ -1,8 +1,18 @@
-#include <string>
+
 
 #include "Sprite.h"
+#include "api/Texture.h"
+#include "util/log.h"
+#include <memory>
+#include <utility>
 
-using namespace crepe::api;
 using namespace std;
+using namespace crepe;
+using namespace crepe::api;
+
+Sprite::Sprite(shared_ptr<Texture> image, const Color & color,
+			   const flip_settings & flip) : color(color), flip(flip), sprite_image(image) {
+	dbg_trace();
+}
 
-Sprite::Sprite(uint32_t gameObjectId, string path) : Component(gameObjectId), path(path) {}
+Sprite::~Sprite() { dbg_trace(); }
diff --git a/src/crepe/api/Sprite.h b/src/crepe/api/Sprite.h
index c06e76c..920f91e 100644
--- a/src/crepe/api/Sprite.h
+++ b/src/crepe/api/Sprite.h
@@ -1,16 +1,30 @@
 #pragma once
 
-#include <string>
+#include "Component.h"
+#include "api/Color.h"
+#include "api/Texture.h"
+#include <SDL2/SDL_rect.h>
+#include <cstdint>
+#include <memory>
 
-#include "../Component.h"
 
 namespace crepe::api {
 
+struct flip_settings{
+	bool flip_x: 1;
+	bool flip_y : 1;
+};
 class Sprite : public Component {
+	
 public:
-	Sprite(uint32_t gameObjectId,std::string path);
+	Sprite(std::shared_ptr<Texture> image, const Color& color, const flip_settings& flip );
+	~Sprite();
+	std::shared_ptr<Texture> sprite_image;
+	Color color;
+	flip_settings flip;
+	uint8_t sorting_in_layer;
+	uint8_t order_in_layer;
 
-	std::string path;
 };
 
-} // namespace crepe::api
+}
diff --git a/src/crepe/api/Texture.cpp b/src/crepe/api/Texture.cpp
new file mode 100644
index 0000000..ba06c6d
--- /dev/null
+++ b/src/crepe/api/Texture.cpp
@@ -0,0 +1,32 @@
+
+
+#include "Asset.h"
+#include "SdlContext.h"
+#include "util/log.h"
+
+#include "Texture.h"
+#include <SDL2/SDL_render.h>
+
+using namespace crepe::api;
+
+Texture::Texture(std::unique_ptr<Asset> res) {
+	dbg_trace();
+	this->load(std::move(res));
+}
+
+Texture::Texture(const char * src) {
+	dbg_trace();
+	this->load(std::make_unique<Asset>(src));
+}
+
+Texture::~Texture() {
+	dbg_trace();
+	if (this->m_texture != nullptr) {
+		SDL_DestroyTexture(m_texture);
+	}
+}
+void Texture::load(std::unique_ptr<Asset> res) {
+	SdlContext & ctx = SdlContext::get_instance();
+	m_texture = ctx.texture_from_path(res->canonical());
+
+}
diff --git a/src/crepe/api/Texture.h b/src/crepe/api/Texture.h
new file mode 100644
index 0000000..b376b44
--- /dev/null
+++ b/src/crepe/api/Texture.h
@@ -0,0 +1,32 @@
+#pragma once
+
+#include "Asset.h"
+#include <SDL2/SDL_render.h>
+#include <memory>
+
+
+namespace crepe {
+	class SdlContext;
+}
+
+namespace crepe::api {
+
+class Texture {
+
+public:
+	Texture(const char * src);
+	Texture(std::unique_ptr<Asset> res);
+	~Texture();
+
+
+private:
+	void load(std::unique_ptr<Asset> res);
+
+
+private:
+	SDL_Texture * m_texture = nullptr;
+
+	friend class crepe::SdlContext;
+};
+
+} // namespace crepe
diff --git a/src/crepe/api/Transform.cpp b/src/crepe/api/Transform.cpp
index 2c39523..c83461f 100644
--- a/src/crepe/api/Transform.cpp
+++ b/src/crepe/api/Transform.cpp
@@ -1,6 +1,13 @@
+
+
 #include "Transform.h"
+#include "api/Point.h"
+#include "util/log.h"
 
-using namespace crepe;
+using namespace crepe::api;
 
-Transform::Transform(uint32_t gameObjectId,Position position, int rotation, int scale)
-	: Component(gameObjectId), postion(postion), rotation(rotation), scale(scale) {}
+Transform::Transform(Point & point, double rot, double scale)
+	: position(point), rotation(rot), scale(scale) {
+	dbg_trace();
+}
+Transform::~Transform() { dbg_trace(); }
diff --git a/src/crepe/api/Transform.h b/src/crepe/api/Transform.h
index 3e8d142..a34ebb1 100644
--- a/src/crepe/api/Transform.h
+++ b/src/crepe/api/Transform.h
@@ -1,22 +1,15 @@
 #pragma once
 
 #include "Component.h"
-
-namespace crepe {
-
-struct Position
-{
-	int x;
-	int y;
-};
-
+#include "api/Point.h"
+namespace crepe::api {
 
 class Transform : public Component {
 public:
-	Transform(uint32_t gameObjectId,Position position, int rotation, int scale);
-	Position postion;
-	int rotation;
-	int scale;
+	Transform(Point&, double, double);
+	~Transform();
+	Point position; // Translation (shift)
+	double rotation; // Rotation, in radians
+	double scale; // Multiplication factoh
 };
-
-} // namespace crepe
+} // namespace crepe::api
diff --git a/src/example/CMakeLists.txt b/src/example/CMakeLists.txt
index ceb8f9d..475d31c 100644
--- a/src/example/CMakeLists.txt
+++ b/src/example/CMakeLists.txt
@@ -23,3 +23,6 @@ add_example(particle)
 add_example(Physics)
 target_link_libraries(particle PUBLIC SDL2)
 target_link_libraries(Physics PUBLIC SDL2)
+add_example(rendering)
+add_example(asset_manager)
+
diff --git a/src/example/asset_manager.cpp b/src/example/asset_manager.cpp
new file mode 100644
index 0000000..9b41c2f
--- /dev/null
+++ b/src/example/asset_manager.cpp
@@ -0,0 +1,35 @@
+
+
+#include <crepe/Sound.h>
+#include <crepe/api/AssetManager.h>
+#include <crepe/api/Texture.h>
+
+using namespace crepe;
+using namespace crepe::api;
+int main() {
+
+	// this needs to be called before the asset manager otherwise the destructor of sdl is not in the right order
+	{
+		Texture test("../asset/texture/img.png");
+	}
+
+	auto & mgr = AssetManager::get_instance();
+
+	{
+		auto bgm = mgr.cache<Sound>("../mwe/audio/bgm.ogg");
+		auto sfx1 = mgr.cache<Sound>("../mwe/audio/sfx1.wav");
+		auto sfx2 = mgr.cache<Sound>("../mwe/audio/sfx2.wav");
+
+		auto img = mgr.cache<Texture>("../asset/texture/img.png");
+		auto img1 = mgr.cache<Texture>("../asset/texture/second.png");
+	}
+
+	{
+		auto bgm = mgr.cache<Sound>("../mwe/audio/bgm.ogg");
+		auto sfx1 = mgr.cache<Sound>("../mwe/audio/sfx1.wav");
+		auto sfx2 = mgr.cache<Sound>("../mwe/audio/sfx2.wav");
+
+		auto img = mgr.cache<Texture>("../asset/texture/img.png");
+		auto img1 = mgr.cache<Texture>("../asset/texture/second.png");
+	}
+}
diff --git a/src/example/rendering.cpp b/src/example/rendering.cpp
new file mode 100644
index 0000000..34d9f66
--- /dev/null
+++ b/src/example/rendering.cpp
@@ -0,0 +1,74 @@
+
+
+#include <crepe/ComponentManager.h>
+#include <crepe/GameObject.h>
+#include <crepe/RenderSystem.h>
+#include <crepe/util/log.h>
+
+#include <crepe/api/Color.h>
+#include <crepe/api/Point.h>
+#include <crepe/api/Sprite.h>
+#include <crepe/api/Texture.h>
+#include <crepe/api/Transform.h>
+#include <crepe/api/AssetManager.h>
+
+#include <chrono>
+#include <memory>
+
+using namespace std;
+using namespace crepe;
+using namespace crepe::api;
+
+int main() {
+
+	dbg_trace();
+
+	auto obj = GameObject(0, "name", "tag", 0);
+	auto obj1= GameObject(0, "name", "tag", 0);
+	auto obj2 = GameObject(0, "name", "tag", 0);
+
+	auto& mgr = AssetManager::get_instance();
+	// Normal adding components
+	{
+		Color color(0, 0, 0, 0);
+		Point point = {
+			.x = 0,
+			.y = 0,
+		};
+		obj.add_component<Transform>(point, 1, 1);
+		obj.add_component<Sprite>(
+			make_shared<Texture>("../asset/texture/img.png"), color,
+			flip_settings{true, true});
+	}
+	{
+		Color color(0, 0, 0, 0);
+		Point point = {
+			.x = 500,
+			.y = 0,
+		};
+		obj.add_component<Transform>(point, 0, 0.1);
+		auto img = mgr.cache<Texture>("../asset/texture/second.png");	
+		obj.add_component<Sprite>(img, color,
+			flip_settings{true, true});
+	}
+	{
+		Color color(0, 0, 0, 0);
+		Point point = {
+			.x = 800,
+			.y = 0,
+		};
+		//obj.add_component<Transform>(point, 0, 0.1);
+		auto img = mgr.cache<Texture>("../asset/texture/second.png");	
+		obj.add_component<Sprite>(img, color,
+			flip_settings{true, true});
+	}
+
+
+
+
+	auto & sys = crepe::RenderSystem::get_instance();
+	auto start = std::chrono::steady_clock::now();
+	while (std::chrono::steady_clock::now() - start < std::chrono::seconds(5)) {
+		sys.update();
+	}
+}