pull origin master

94 files changed, 2283 insertions, 174 deletions

diff --git a/.clang-format b/.clang-format
index 5d233eb..3ae6c28 100644
--- a/.clang-format
+++ b/.clang-format
@@ -22,6 +22,7 @@ AlignTrailingComments:
 ReflowComments: false
 AlignEscapedNewlines: DontAlign
 BreakBeforeBinaryOperators: All
+AlwaysBreakTemplateDeclarations: Yes
 ...
 
 # vim: ft=yaml
diff --git a/.clang-tidy b/.clang-tidy
index b242e3f..214a5ab 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -1,18 +1,35 @@
 Checks: '-*,readability-identifier-naming'
 CheckOptions:
-	- { key: readability-identifier-naming.EnumCase, value: lower_case }
-	- { key: readability-identifier-naming.GlobalFunctionCase, value: lower_case }
-	- { key: readability-identifier-naming.ClassCase, value: CamelCase }
-	- { key: readability-identifier-naming.ClassMethodCase, value: lower_case }
-	- { key: readability-identifier-naming.ClassMethodPrefix, value: '' }
-	- { key: readability-identifier-naming.ClassMemberCase, value: lower_case }
-	- { key: readability-identifier-naming.ClassMemberPrefix, value: '' }
-	- { key: readability-identifier-naming.GlobalConstantCase, value: UPPER_CASE }
-	- { key: readability-identifier-naming.GlobalConstantIgnoredRegexp, value: _.* }
-	- { key: readability-identifier-naming.GlobalVariableCase, value: lower_case }
-	- { key: readability-identifier-naming.GlobalVariableIgnoredRegexp, value: _.* }
-	- { key: readability-identifier-naming.MacroDefinitionCase, value: UPPER_CASE }
-	- { key: readability-identifier-naming.MacroDefinitionIgnoredRegexp, value: _.* }
-	- { key: readability-identifier-naming.StructCase, value: lower_case }
+  - key: 'readability-identifier-naming.EnumCase'
+    value: 'lower_case'
+  - key: 'readability-identifier-naming.GlobalFunctionCase'
+    value: 'lower_case'
+  - key: 'readability-identifier-naming.ClassCase'
+    value: 'CamelCase'
+  - key: 'readability-identifier-naming.MethodCase'
+    value: 'lower_case'
+  - key: 'readability-identifier-naming.MethodPrefix'
+    value: ''
+  - key: 'readability-identifier-naming.MemberCase'
+    value: 'lower_case'
+  - key: 'readability-identifier-naming.MemberPrefix'
+    value: ''
+  - key: 'readability-identifier-naming.ConstantCase'
+    value: 'UPPER_CASE'
+  - key: 'readability-identifier-naming.ConstantIgnoredRegexp'
+    value: '_.*'
+  - key: 'readability-identifier-naming.ConstantParameterCase'
+    value: 'lower_case'
+  - key: 'readability-identifier-naming.VariableCase'
+    value: 'lower_case'
+  - key: 'readability-identifier-naming.VariableIgnoredRegexp'
+    value: '_.*'
+  - key: 'readability-identifier-naming.MacroDefinitionCase'
+    value: 'UPPER_CASE'
+  - key: 'readability-identifier-naming.MacroDefinitionIgnoredRegexp'
+    value: '_.*'
+  - key: 'readability-identifier-naming.StructCase'
+    value: 'lower_case'
 
 # vim: ft=yaml
+
diff --git a/.editorconfig b/.editorconfig
index 1bd7da9..df2cf5e 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -5,7 +5,7 @@ indent_style = tab
 end_of_line = lf
 insert_final_newline = true
 
-[*.{md,yml}]
+[{*.{md,yml},.clang-*}]
 indent_style = space
 indent_size = 2
 
diff --git a/.gitmodules b/.gitmodules
index bb860c0..7dd39b2 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -3,7 +3,7 @@
 	url = https://github.com/google/googletest
 	shallow = true
 [submodule "lib/soloud/src"]
-	path = lib/soloud/src
+	path = lib/soloud
 	url = https://github.com/jarikomppa/soloud
 	shallow = true
 [submodule "lib/sdl2"]
diff --git a/.vscode/extensions.json b/.vscode/extensions.json
index 5b380e1..977c0ca 100644
--- a/.vscode/extensions.json
+++ b/.vscode/extensions.json
@@ -1,5 +1,6 @@
 {
 	"recommendations": [
+		"llvm-vs-code-extensions.vscode-clangd",
 		"EditorConfig.EditorConfig",
 		"ms-vscode.cmake-tools"
 	]
diff --git a/contributing.md b/contributing.md
index eec5bc0..364e835 100644
--- a/contributing.md
+++ b/contributing.md
@@ -17,11 +17,48 @@
 # Code style
 
 - ASCII only
+- Class names are always singular
+- Explanatory comments are placed above the line(s) they are explaining
+- Source files should only contain comments that plainly state what the code is
+  supposed to do
+- Explanatory comments in headers may be used to clarify implementation design
+  decisions
 - Formatting nitty-gritty is handled by clang-format/clang-tidy (run `make
   format` in the root folder of this repository to format all sources files)
 - When using libraries of which the header include order is important, make
   sure to separate the include statements using a blank line (clang-format may
   sort include statements, but does not sort across empty lines).
+- All engine-related code is implemented under the `crepe` namespace,
+  user-facing APIs under `crepe::api` (the folder structure should also reflect
+  this).
+- `using namespace` may not be used in header files, only in source files.
+- Do not (indirectly) include private dependency headers in API header files,
+  as these are no longer accessible when the engine is installed
+- Getter and setter functions are appropriately prefixed with `get_` and
+  `set_`.
+- Doxygen commands are used with a backslash instead of an at-sign (i.e.
+  `\brief` instead of `@brief`)
+- A singleton's instance is always accessed using a getter function that
+  instantiates its own class as a static variable within the getter function
+  scope, instead of storing the instance as a member variable directly:
+
+  ```cpp
+  class Bad {
+    static Bad instance;
+    Bad & get_instance() { return instance; }
+  };
+
+  class Good {
+    Good & get_instance() {
+      static Good instance;
+      return instance;
+    }
+  };
+  ```
+- Member variable default values should be directly defined in the class
+  declaration instead of using the constructor.
+- Header files declare either a single class or symbols within a single
+  namespace.
 
 ## CMakeLists specific
 
diff --git a/lib/soloud/src b/lib/soloud
-Subproject e82fd32c1f62183922f08c14c814a02b58db187
+Subproject e82fd32c1f62183922f08c14c814a02b58db187
diff --git a/lib/soloud/CMakeLists.txt b/lib/soloud/CMakeLists.txt
deleted file mode 100644
index 8433281..0000000
--- a/lib/soloud/CMakeLists.txt
+++ /dev/null
@@ -1,97 +0,0 @@
-cmake_minimum_required(VERSION 3.28)
-
-set(CMAKE_C_STANDARD 11)
-set(CMAKE_CXX_STANDARD 20)
-
-add_compile_definitions(WITH_SDL2)
-
-add_subdirectory(../sdl2 sdl2)
-
-project(soloud C CXX)
-
-add_library(soloud STATIC
-	src/src/audiosource/ay/chipplayer.cpp
-	src/src/audiosource/ay/sndbuffer.cpp
-	src/src/audiosource/ay/sndchip.cpp
-	src/src/audiosource/ay/sndrender.cpp
-	src/src/audiosource/ay/soloud_ay.cpp
-	src/src/audiosource/monotone/soloud_monotone.cpp
-	src/src/audiosource/noise/soloud_noise.cpp
-	src/src/audiosource/openmpt/soloud_openmpt.cpp
-	src/src/audiosource/openmpt/soloud_openmpt_dll.c
-	src/src/audiosource/sfxr/soloud_sfxr.cpp
-	src/src/audiosource/speech/darray.cpp
-	src/src/audiosource/speech/klatt.cpp
-	src/src/audiosource/speech/resonator.cpp
-	src/src/audiosource/speech/soloud_speech.cpp
-	src/src/audiosource/speech/tts.cpp
-	src/src/audiosource/tedsid/sid.cpp
-	src/src/audiosource/tedsid/soloud_tedsid.cpp
-	src/src/audiosource/tedsid/ted.cpp
-	src/src/audiosource/vic/soloud_vic.cpp
-	src/src/audiosource/vizsn/soloud_vizsn.cpp
-	src/src/audiosource/wav/dr_impl.cpp
-	src/src/audiosource/wav/soloud_wav.cpp
-	src/src/audiosource/wav/soloud_wavstream.cpp
-	src/src/audiosource/wav/stb_vorbis.c
-
-	src/src/backend/alsa/soloud_alsa.cpp
-	src/src/backend/coreaudio/soloud_coreaudio.cpp
-	src/src/backend/jack/soloud_jack.cpp
-	src/src/backend/miniaudio/soloud_miniaudio.cpp
-	src/src/backend/nosound/soloud_nosound.cpp
-	src/src/backend/null/soloud_null.cpp
-	src/src/backend/openal/soloud_openal.cpp
-	src/src/backend/openal/soloud_openal_dll.c
-	src/src/backend/opensles/soloud_opensles.cpp
-	src/src/backend/oss/soloud_oss.cpp
-	src/src/backend/portaudio/soloud_portaudio.cpp
-	src/src/backend/portaudio/soloud_portaudio_dll.c
-	src/src/backend/sdl/soloud_sdl1.cpp
-	src/src/backend/sdl/soloud_sdl1_dll.c
-	src/src/backend/sdl/soloud_sdl2.cpp
-	src/src/backend/sdl/soloud_sdl2_dll.c
-	src/src/backend/sdl2_static/soloud_sdl2_static.cpp
-	src/src/backend/sdl_static/soloud_sdl_static.cpp
-	src/src/backend/wasapi/soloud_wasapi.cpp
-	src/src/backend/winmm/soloud_winmm.cpp
-	src/src/backend/xaudio2/soloud_xaudio2.cpp
-
-	src/src/core/soloud.cpp
-	src/src/core/soloud_audiosource.cpp
-	src/src/core/soloud_bus.cpp
-	src/src/core/soloud_core_3d.cpp
-	src/src/core/soloud_core_basicops.cpp
-	src/src/core/soloud_core_faderops.cpp
-	src/src/core/soloud_core_filterops.cpp
-	src/src/core/soloud_core_getters.cpp
-	src/src/core/soloud_core_setters.cpp
-	src/src/core/soloud_core_voicegroup.cpp
-	src/src/core/soloud_core_voiceops.cpp
-	src/src/core/soloud_fader.cpp
-	src/src/core/soloud_fft.cpp
-	src/src/core/soloud_fft_lut.cpp
-	src/src/core/soloud_file.cpp
-	src/src/core/soloud_filter.cpp
-	src/src/core/soloud_misc.cpp
-	src/src/core/soloud_queue.cpp
-	src/src/core/soloud_thread.cpp
-
-	# src/src/filter/soloud_bassboostfilter.cpp
-	# src/src/filter/soloud_biquadresonantfilter.cpp
-	# src/src/filter/soloud_dcremovalfilter.cpp
-	# src/src/filter/soloud_duckfilter.cpp
-	# src/src/filter/soloud_echofilter.cpp
-	# src/src/filter/soloud_eqfilter.cpp
-	# src/src/filter/soloud_fftfilter.cpp
-	# src/src/filter/soloud_flangerfilter.cpp
-	# src/src/filter/soloud_freeverbfilter.cpp
-	# src/src/filter/soloud_lofifilter.cpp
-	# src/src/filter/soloud_robotizefilter.cpp
-	# src/src/filter/soloud_waveshaperfilter.cpp
-)
-target_include_directories(soloud PRIVATE src/include)
-target_include_directories(soloud SYSTEM INTERFACE src/include)
-
-target_link_libraries(soloud PRIVATE SDL2)
-
diff --git a/makefile b/makefile
index 737e7a8..dd7c587 100644
--- a/makefile
+++ b/makefile
@@ -6,6 +6,5 @@ doxygen: Doxyfile FORCE
 FMT += $(shell git ls-files '*.c' '*.cpp' '*.h' '*.hpp')
 format: FORCE
 	clang-format -i $(FMT)
-# clang tidy doesn't work that well :/
-# clang-tidy --fix-errors $(FMT)
+	$(MAKE) -C src $@
 
diff --git a/mwe/audio/soloud/main.cpp b/mwe/audio/soloud/main.cpp
index 25ba003..50df0b7 100644
--- a/mwe/audio/soloud/main.cpp
+++ b/mwe/audio/soloud/main.cpp
@@ -38,8 +38,7 @@ int main() {
 	this_thread::sleep_for(500ms);
 
 	// play all samples simultaniously
-	for (unsigned i = 0; i < 3; i++)
-		soloud.play(sfx[i]);
+	for (unsigned i = 0; i < 3; i++) soloud.play(sfx[i]);
 	this_thread::sleep_for(1000ms);
 
 	// stop all audio and exit
diff --git a/mwe/dynlink/exec/CMakeLists.txt b/mwe/dynlink/exec/CMakeLists.txt
index 5335f0f..465b45e 100644
--- a/mwe/dynlink/exec/CMakeLists.txt
+++ b/mwe/dynlink/exec/CMakeLists.txt
@@ -5,12 +5,20 @@ set(CMAKE_CXX_STANDARD 20)
 
 project(main C CXX)
 
+add_executable(main main.c)
+
 # Since we have the source code for the test library, we might as well let
 # CMake use it so it automatically picks up the interface headers and compiles
 # the library for us. The same can be achieved manually, but is more code.
 add_subdirectory(../lib test)
 
-add_executable(main main.c)
+# include(ExternalProject)
+# ExternalProject_Add(test_ext
+# 	SOURCE_DIR ../../lib
+# 	CMAKE_ARGS -DCMAKE_INSTALL_PREFIX="${CMAKE_BINARY_DIR}/ext"
+# )
+# add_dependencies(main test_ext)
+# find_package(test REQUIRED)
 
 # Make sure ld.so (linux) looks in the same folder as the final executable for
 # the .so dependency
diff --git a/mwe/dynlink/exec/main.c b/mwe/dynlink/exec/main.c
index 2bbdc20..ff884f2 100644
--- a/mwe/dynlink/exec/main.c
+++ b/mwe/dynlink/exec/main.c
@@ -1,4 +1,4 @@
-#include <lib.h>
+#include <test.h>
 
 int main() {
 	library_function();
diff --git a/mwe/dynlink/lib/CMakeLists.txt b/mwe/dynlink/lib/CMakeLists.txt
index 2d15353..7efc91a 100644
--- a/mwe/dynlink/lib/CMakeLists.txt
+++ b/mwe/dynlink/lib/CMakeLists.txt
@@ -5,6 +5,20 @@ set(CMAKE_CXX_STANDARD 20)
 
 project(lib C CXX)
 
-add_library(test SHARED lib.c)
+add_library(test SHARED)
+
 target_include_directories(test SYSTEM INTERFACE .)
 
+target_sources(test PUBLIC
+	test.c
+)
+
+target_sources(test PUBLIC FILE_SET HEADERS FILES
+	test.h
+)
+
+install(
+	TARGETS test
+	FILE_SET HEADERS DESTINATION include
+)
+
diff --git a/mwe/dynlink/lib/lib.c b/mwe/dynlink/lib/test.c
index c7a78e4..c7a78e4 100644
--- a/mwe/dynlink/lib/lib.c
+++ b/mwe/dynlink/lib/test.c
diff --git a/mwe/dynlink/lib/lib.h b/mwe/dynlink/lib/test.h
index 093eadb..093eadb 100644
--- a/mwe/dynlink/lib/lib.h
+++ b/mwe/dynlink/lib/test.h
diff --git a/mwe/ecs-homemade/CMakeLists.txt b/mwe/ecs-homemade/CMakeLists.txt
new file mode 100644
index 0000000..6267c1a
--- /dev/null
+++ b/mwe/ecs-homemade/CMakeLists.txt
@@ -0,0 +1,17 @@
+cmake_minimum_required(VERSION 3.5)
+project(ecs-homemade)
+
+# Set the C++ standard (optional, but good practice)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
+
+# Use the debug mode (otherwise breakpoints are not compiled)
+set(CMAKE_BUILD_TYPE Debug)
+
+add_executable(ecs-homemade
+	src/main.cpp
+	src/ComponentManager.cpp
+	src/Components.cpp
+	src/GameObjectMax.cpp
+)
+target_include_directories(ecs-homemade PRIVATE "${CMAKE_SOURCE_DIR}/inc")
diff --git a/mwe/ecs-homemade/inc/ComponentManager.h b/mwe/ecs-homemade/inc/ComponentManager.h
new file mode 100644
index 0000000..0ba358e
--- /dev/null
+++ b/mwe/ecs-homemade/inc/ComponentManager.h
@@ -0,0 +1,58 @@
+#pragma once
+
+#include "Components.h"
+#include <cstdint>
+#include <memory>
+#include <typeindex>
+#include <unordered_map>
+#include <utility>
+#include <vector>
+
+class ComponentManager {
+public:
+	static ComponentManager & GetInstance(); //Singleton
+
+	ComponentManager(const ComponentManager &) = delete; //Singleton
+	ComponentManager(ComponentManager &&) = delete; //Singleton
+	ComponentManager & operator=(const ComponentManager &) = delete; //Singleton
+	ComponentManager & operator=(ComponentManager &&) = delete; //Singleton
+
+	//Add a component of a specific type
+	template <typename T, typename... Args>
+	T & AddComponent(std::uint32_t id, Args &&... args);
+	//Deletes all components of a specific type and id
+	template <typename T>
+	void DeleteComponentsById(std::uint32_t id);
+	//Deletes all components of a specific type
+	template <typename T>
+	void DeleteComponents();
+	//Deletes all components of a specific id
+	void DeleteAllComponentsOfId(std::uint32_t id);
+	//Deletes all components
+	void DeleteAllComponents();
+
+	//Get a vector<> of all components at specific type and id
+	template <typename T>
+	std::vector<std::reference_wrapper<T>>
+	GetComponentsByID(std::uint32_t id) const;
+	//Get a vector<> of all components of a specific type
+	template <typename T>
+	std::vector<std::reference_wrapper<T>> GetComponentsByType() const;
+
+private:
+	static ComponentManager mInstance; //Singleton
+
+	ComponentManager(); //Singleton
+
+	/*
+	 * The std::unordered_map<std::type_index, std::vector<std::vector<std::unique_ptr<Component>>>> below might seem a bit strange, let me explain this structure:
+	 * The std::unordered_map<> has a key and value. The key is a std::type_index and the value is a std::vector. So, a new std::vector will be created for each new std::type_index.
+	 * The first std::vector<> stores another vector<>. This first vector<> is to bind the entity's id to a component.
+	 * The second std::vector<> stores unique_ptrs. Each component can be gathered via an unique_ptr. This second vector<> allows multiple components of the same std::type_index for one entity (id).
+	 */
+	std::unordered_map<std::type_index,
+					   std::vector<std::vector<std::unique_ptr<Component>>>>
+		mComponents;
+};
+
+#include "ComponentManager.hpp"
diff --git a/mwe/ecs-homemade/inc/ComponentManager.hpp b/mwe/ecs-homemade/inc/ComponentManager.hpp
new file mode 100644
index 0000000..92db1d4
--- /dev/null
+++ b/mwe/ecs-homemade/inc/ComponentManager.hpp
@@ -0,0 +1,135 @@
+
+template <typename T, typename... Args>
+T & ComponentManager::AddComponent(std::uint32_t id, Args &&... args) {
+	//Determine the type of T (this is used as the key of the unordered_map<>)
+	std::type_index type = typeid(T);
+
+	//Check if this component type is already in the unordered_map<>
+	if (mComponents.find(type) == mComponents.end()) {
+		//If not, create a new (empty) vector<> of vector<unique_ptr<Component>>
+		mComponents[type]
+			= std::vector<std::vector<std::unique_ptr<Component>>>();
+	}
+
+	//Resize the vector<> if the id is greater than the current size
+	if (id >= mComponents[type].size()) {
+		//Initialize new slots to nullptr (resize does automatically init to nullptr)
+		mComponents[type].resize(id + 1);
+	}
+
+	//Create a new component of type T using perfect forwarding and store its unique_ptr in the vector<>
+	mComponents[type][id].push_back(
+		std::make_unique<T>(std::forward<Args>(args)...));
+
+	return static_cast<T &>(*mComponents[type][id].back().get());
+}
+
+template <typename T>
+void ComponentManager::DeleteComponentsById(std::uint32_t id) {
+	//Determine the type of T (this is used as the key of the unordered_map<>)
+	std::type_index type = typeid(T);
+
+	//Find the type (in the unordered_map<>)
+	if (mComponents.find(type) != mComponents.end()) {
+		//Get the correct vector<>
+		std::vector<std::vector<std::unique_ptr<Component>>> & componentArray
+			= mComponents[type];
+
+		//Make sure that the id (that we are looking for) is within the boundaries of the vector<>
+		if (id < componentArray.size()) {
+			//Clear the whole vector<> of this specific type and id
+			componentArray[id].clear();
+		}
+	}
+}
+
+template <typename T>
+void ComponentManager::DeleteComponents() {
+	//Determine the type of T (this is used as the key of the unordered_map<>)
+	std::type_index type = typeid(T);
+
+	//Find the type (in the unordered_map<>)
+	if (mComponents.find(type) != mComponents.end()) {
+		//Clear the whole vector<> of this specific type
+		mComponents[type].clear();
+	}
+}
+
+template <typename T>
+std::vector<std::reference_wrapper<T>>
+ComponentManager::GetComponentsByID(std::uint32_t id) const {
+	//Determine the type of T (this is used as the key of the unordered_map<>)
+	std::type_index type = typeid(T);
+
+	//Create an empty vector<>
+	std::vector<std::reference_wrapper<T>> componentVector;
+
+	//Find the type (in the unordered_map<>)
+	if (mComponents.find(type) != mComponents.end()) {
+
+		//Get the correct vector<>
+		const std::vector<std::vector<std::unique_ptr<Component>>> &
+			componentArray
+			= mComponents.at(type);
+
+		//Make sure that the id (that we are looking for) is within the boundaries of the vector<>
+		if (id < componentArray.size()) {
+			//Loop trough the whole vector<>
+			for (const std::unique_ptr<Component> & componentPtr :
+				 componentArray[id]) {
+				//Cast the unique_ptr to a raw pointer
+				T * castedComponent = static_cast<T *>(componentPtr.get());
+
+				//Ensure that the cast was successful
+				if (castedComponent) {
+					//Add the dereferenced raw pointer to the vector<>
+					componentVector.push_back(*castedComponent);
+				}
+			}
+		}
+	}
+
+	//Return the vector<>
+	return componentVector;
+}
+
+template <typename T>
+std::vector<std::reference_wrapper<T>>
+ComponentManager::GetComponentsByType() const {
+	//Determine the type of T (this is used as the key of the unordered_map<>)
+	std::type_index type = typeid(T);
+
+	//Create an empty vector<>
+	std::vector<std::reference_wrapper<T>> componentVector;
+	//std::uint32_t id = 0;	//Set the id to 0 (the id will also be stored in the returned vector<>)
+
+	//Find the type (in the unordered_map<>)
+	if (mComponents.find(type) != mComponents.end()) {
+
+		//Get the correct vector<>
+		const std::vector<std::vector<std::unique_ptr<Component>>> &
+			componentArray
+			= mComponents.at(type);
+
+		//Loop through the whole vector<>
+		for (const std::vector<std::unique_ptr<Component>> & component :
+			 componentArray) {
+			//Loop trough the whole vector<>
+			for (const std::unique_ptr<Component> & componentPtr : component) {
+				//Cast the unique_ptr to a raw pointer
+				T * castedComponent = static_cast<T *>(componentPtr.get());
+
+				//Ensure that the cast was successful
+				if (castedComponent) {
+					//Pair the dereferenced raw pointer and the id and add it to the vector<>
+					componentVector.emplace_back(std::ref(*castedComponent));
+				}
+			}
+
+			//++id;	//Increase the id (the id will also be stored in the returned vector<>)
+		}
+	}
+
+	//Return the vector<>
+	return componentVector;
+}
diff --git a/mwe/ecs-homemade/inc/Components.h b/mwe/ecs-homemade/inc/Components.h
new file mode 100644
index 0000000..ad491e7
--- /dev/null
+++ b/mwe/ecs-homemade/inc/Components.h
@@ -0,0 +1,66 @@
+#pragma once
+
+#include <memory>
+#include <string>
+
+class Component {
+public:
+	Component();
+
+	bool mActive;
+};
+
+class Sprite : public Component {
+public:
+	Sprite(std::string path);
+
+	std::string mPath;
+};
+
+class Rigidbody : public Component {
+public:
+	Rigidbody(int mass, int gravityScale, int bodyType);
+
+	int mMass;
+	int mGravityScale;
+	int mBodyType;
+};
+
+class Colider : public Component {
+public:
+	Colider(int size);
+
+	int mSize;
+};
+
+class IBehaviour {
+public:
+	virtual ~IBehaviour() = default;
+	virtual void onStart() = 0;
+	virtual void onUpdate() = 0;
+};
+
+template <typename T>
+class BehaviourWrapper : public IBehaviour {
+public:
+	BehaviourWrapper();
+	void onStart() override;
+	void onUpdate() override;
+
+private:
+	T instance;
+};
+
+class BehaviourScript : public Component {
+public:
+	template <typename T>
+	void addScript();
+
+	void onStart();
+	void onUpdate();
+
+private:
+	std::unique_ptr<IBehaviour> behaviour;
+};
+
+#include "Components.hpp"
diff --git a/mwe/ecs-homemade/inc/Components.hpp b/mwe/ecs-homemade/inc/Components.hpp
new file mode 100644
index 0000000..436a28c
--- /dev/null
+++ b/mwe/ecs-homemade/inc/Components.hpp
@@ -0,0 +1,20 @@
+#include "Components.h"
+#include <iostream>
+
+template <typename T>
+BehaviourWrapper<T>::BehaviourWrapper() : instance() {}
+
+template <typename T>
+void BehaviourWrapper<T>::onStart() {
+	instance.onStart();
+}
+
+template <typename T>
+void BehaviourWrapper<T>::onUpdate() {
+	instance.onUpdate();
+}
+
+template <typename T>
+void BehaviourScript::addScript() {
+	behaviour = std::make_unique<BehaviourWrapper<T>>();
+}
diff --git a/mwe/ecs-homemade/inc/GameObjectMax.h b/mwe/ecs-homemade/inc/GameObjectMax.h
new file mode 100644
index 0000000..5fab44a
--- /dev/null
+++ b/mwe/ecs-homemade/inc/GameObjectMax.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#include <cstdint>
+#include <string>
+
+class GameObject {
+public:
+	GameObject(std::uint32_t id, std::string name, std::string tag, int layer);
+
+	template <typename T, typename... Args>
+	T & AddComponent(Args &&... args);
+
+	std::uint32_t mId;
+	std::string mName;
+	std::string mTag;
+	bool mActive;
+	int mLayer;
+};
+
+#include "GameObjectMax.hpp"
diff --git a/mwe/ecs-homemade/inc/GameObjectMax.hpp b/mwe/ecs-homemade/inc/GameObjectMax.hpp
new file mode 100644
index 0000000..2f433bb
--- /dev/null
+++ b/mwe/ecs-homemade/inc/GameObjectMax.hpp
@@ -0,0 +1,7 @@
+#include "ComponentManager.h"
+
+template <typename T, typename... Args>
+T & GameObject::AddComponent(Args &&... args) {
+	return ComponentManager::GetInstance().AddComponent<T>(
+		mId, std::forward<Args>(args)...);
+}
diff --git a/mwe/ecs-homemade/src/ComponentManager.cpp b/mwe/ecs-homemade/src/ComponentManager.cpp
new file mode 100644
index 0000000..536c152
--- /dev/null
+++ b/mwe/ecs-homemade/src/ComponentManager.cpp
@@ -0,0 +1,23 @@
+#include "ComponentManager.h"
+
+ComponentManager ComponentManager::mInstance;
+
+ComponentManager & ComponentManager::GetInstance() { return mInstance; }
+
+ComponentManager::ComponentManager() {}
+
+void ComponentManager::DeleteAllComponentsOfId(std::uint32_t id) {
+	for (auto & [type, componentArray] :
+		 mComponents) { //Loop through all the types (in the unordered_map<>)
+		if (id
+			< componentArray
+				  .size()) { //Make sure that the id (that we are looking for) is within the boundaries of the vector<>
+			componentArray[id]
+				.clear(); //Clear the components at this specific id
+		}
+	}
+}
+
+void ComponentManager::DeleteAllComponents() {
+	mComponents.clear(); //Clear the whole unordered_map<>
+}
diff --git a/mwe/ecs-homemade/src/Components.cpp b/mwe/ecs-homemade/src/Components.cpp
new file mode 100644
index 0000000..de8753e
--- /dev/null
+++ b/mwe/ecs-homemade/src/Components.cpp
@@ -0,0 +1,23 @@
+#include "Components.h"
+#include <iostream>
+
+Component::Component() : mActive(true) {}
+
+Sprite::Sprite(std::string path) : mPath(path) {}
+
+Rigidbody::Rigidbody(int mass, int gravityScale, int bodyType)
+	: mMass(mass), mGravityScale(gravityScale), mBodyType(bodyType) {}
+
+Colider::Colider(int size) : mSize(size) {}
+
+void BehaviourScript::onStart() {
+	if (behaviour) {
+		behaviour->onStart();
+	}
+}
+
+void BehaviourScript::onUpdate() {
+	if (behaviour) {
+		behaviour->onUpdate();
+	}
+}
diff --git a/mwe/ecs-homemade/src/GameObjectMax.cpp b/mwe/ecs-homemade/src/GameObjectMax.cpp
new file mode 100644
index 0000000..b0c5af7
--- /dev/null
+++ b/mwe/ecs-homemade/src/GameObjectMax.cpp
@@ -0,0 +1,7 @@
+#include "GameObjectMax.h"
+
+#include "ComponentManager.h"
+
+GameObject::GameObject(std::uint32_t id, std::string name, std::string tag,
+					   int layer)
+	: mId(id), mName(name), mTag(tag), mActive(true), mLayer(layer) {}
diff --git a/mwe/ecs-homemade/src/main.cpp b/mwe/ecs-homemade/src/main.cpp
new file mode 100644
index 0000000..70c5d2c
--- /dev/null
+++ b/mwe/ecs-homemade/src/main.cpp
@@ -0,0 +1,75 @@
+#include <chrono>
+#include <cstdint>
+#include <iostream>
+#include <vector>
+
+#include "ComponentManager.h"
+#include "Components.h"
+#include "GameObjectMax.h"
+
+class myScript {
+public:
+	void onStart() { std::cout << "In onStart" << std::endl; }
+
+	void onUpdate() { std::cout << "In onUpdate" << std::endl; }
+};
+
+int main() {
+	auto startAdding = std::chrono::high_resolution_clock::now();
+
+	GameObject * gameObject[100000];
+
+	for (int i = 0; i < 100000; ++i) {
+		gameObject[i] = new GameObject(i, "Name", "Tag", 0);
+
+		gameObject[i]->AddComponent<Sprite>("C:/Test");
+		gameObject[i]->AddComponent<Rigidbody>(0, 0, i);
+		gameObject[i]->AddComponent<Colider>(i);
+		gameObject[i]->AddComponent<BehaviourScript>().addScript<myScript>();
+	}
+
+	auto stopAdding = std::chrono::high_resolution_clock::now();
+
+	//This is what systems would do:
+
+	std::vector<std::reference_wrapper<Sprite>> sprites
+		= ComponentManager::GetInstance().GetComponentsByType<Sprite>();
+	for (Sprite & sprite : sprites) {
+		//std::cout << sprite.get().mPath << std::endl;
+	}
+	//std::cout << std::endl;
+
+	std::vector<std::reference_wrapper<Rigidbody>> rigidBodies
+		= ComponentManager::GetInstance().GetComponentsByType<Rigidbody>();
+	for (Rigidbody & rigidbody : rigidBodies) {
+		//std::cout << rigidbody.get().mMass << " " << rigidbody.get().mGravityScale << " " << rigidbody.get().mBodyType << std::endl;
+	}
+	//std::cout << std::endl;
+
+	std::vector<std::reference_wrapper<Colider>> coliders
+		= ComponentManager::GetInstance().GetComponentsByType<Colider>();
+	for (Colider & colider : coliders) {
+		//std::cout << colider.get().mSize << std::endl;
+	}
+
+	std::vector<std::reference_wrapper<BehaviourScript>> scripts
+		= ComponentManager::GetInstance()
+			  .GetComponentsByType<BehaviourScript>();
+	for (BehaviourScript & script : scripts) {
+		//script.onStart();
+		//script.onUpdate();
+	}
+
+	auto stopLooping = std::chrono::high_resolution_clock::now();
+
+	for (int i = 0; i < 100000; ++i) {
+		delete gameObject[i];
+	}
+
+	auto Addtime = std::chrono::duration_cast<std::chrono::microseconds>(
+		stopAdding - startAdding);
+	auto LoopTime = std::chrono::duration_cast<std::chrono::microseconds>(
+		stopLooping - stopAdding);
+	std::cout << "AddTime: " << Addtime.count() << " us" << std::endl;
+	std::cout << "LoopTime: " << LoopTime.count() << " us" << std::endl;
+}
diff --git a/mwe/ecs-memory-efficient/CMakeLists.txt b/mwe/ecs-memory-efficient/CMakeLists.txt
new file mode 100644
index 0000000..d072907
--- /dev/null
+++ b/mwe/ecs-memory-efficient/CMakeLists.txt
@@ -0,0 +1,17 @@
+cmake_minimum_required(VERSION 3.5)
+project(ecs-memory-efficient)
+
+# Set the C++ standard (optional, but good practice)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
+
+# Use the debug mode (otherwise breakpoints are not compiled)
+set(CMAKE_BUILD_TYPE Debug)
+
+add_executable(ecs-memory-efficient
+	src/main.cpp
+	src/ComponentManager.cpp
+	src/Components.cpp
+	src/GameObjectMax.cpp
+)
+target_include_directories(ecs-memory-efficient PRIVATE "${CMAKE_SOURCE_DIR}/inc")
diff --git a/mwe/ecs-memory-efficient/inc/ComponentManager.h b/mwe/ecs-memory-efficient/inc/ComponentManager.h
new file mode 100644
index 0000000..8279a9a
--- /dev/null
+++ b/mwe/ecs-memory-efficient/inc/ComponentManager.h
@@ -0,0 +1,36 @@
+#pragma once
+
+#include "Components.h"
+#include "ContiguousContainer.h"
+
+class ComponentManager {
+public:
+	static ComponentManager & GetInstance(); //Singleton
+
+	ComponentManager(const ComponentManager &) = delete; //Singleton
+	ComponentManager(ComponentManager &&) = delete; //Singleton
+	ComponentManager & operator=(const ComponentManager &) = delete; //Singleton
+	ComponentManager & operator=(ComponentManager &&) = delete; //Singleton
+
+	template <typename... Args>
+	void addSpriteComponent(Args &&... args);
+	template <typename... Args>
+	void addRigidbodyComponent(Args &&... args);
+	template <typename... Args>
+	void addColiderComponent(Args &&... args);
+
+	std::vector<std::reference_wrapper<Sprite>> getAllSpriteReferences();
+	std::vector<std::reference_wrapper<Rigidbody>> getAllRigidbodyReferences();
+	std::vector<std::reference_wrapper<Colider>> getAllColiderReferences();
+
+private:
+	static ComponentManager mInstance; //Singleton
+
+	ComponentManager(); //Singleton
+
+	ContiguousContainer<Sprite> mSpriteContainer;
+	ContiguousContainer<Rigidbody> mRigidbodyContainer;
+	ContiguousContainer<Colider> mColiderContainer;
+};
+
+#include "ComponentManager.hpp"
diff --git a/mwe/ecs-memory-efficient/inc/ComponentManager.hpp b/mwe/ecs-memory-efficient/inc/ComponentManager.hpp
new file mode 100644
index 0000000..a914a6b
--- /dev/null
+++ b/mwe/ecs-memory-efficient/inc/ComponentManager.hpp
@@ -0,0 +1,15 @@
+
+template <typename... Args>
+void ComponentManager::addSpriteComponent(Args &&... args) {
+	mSpriteContainer.pushBack(std::forward<Args>(args)...);
+}
+
+template <typename... Args>
+void ComponentManager::addRigidbodyComponent(Args &&... args) {
+	mRigidbodyContainer.pushBack(std::forward<Args>(args)...);
+}
+
+template <typename... Args>
+void ComponentManager::addColiderComponent(Args &&... args) {
+	mColiderContainer.pushBack(std::forward<Args>(args)...);
+}
diff --git a/mwe/ecs-memory-efficient/inc/Components.h b/mwe/ecs-memory-efficient/inc/Components.h
new file mode 100644
index 0000000..98c5fe7
--- /dev/null
+++ b/mwe/ecs-memory-efficient/inc/Components.h
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <string>
+
+class Component {
+public:
+	Component();
+
+	bool mActive;
+};
+
+class Sprite : public Component {
+public:
+	Sprite(std::string path);
+
+	std::string mPath;
+};
+
+class Rigidbody : public Component {
+public:
+	Rigidbody(int mass, int gravityScale, int bodyType);
+
+	int mMass;
+	int mGravityScale;
+	int mBodyType;
+};
+
+class Colider : public Component {
+public:
+	Colider(int size);
+
+	int mSize;
+};
diff --git a/mwe/ecs-memory-efficient/inc/ContiguousContainer.h b/mwe/ecs-memory-efficient/inc/ContiguousContainer.h
new file mode 100644
index 0000000..e3b57ba
--- /dev/null
+++ b/mwe/ecs-memory-efficient/inc/ContiguousContainer.h
@@ -0,0 +1,34 @@
+#pragma once
+
+#include <cstdlib> // For malloc and free
+#include <new> // For placement new
+#include <stdexcept> // For std::bad_alloc
+#include <utility> // For std::move and std::forward
+#include <vector> // For returning references
+
+template <typename T>
+class ContiguousContainer {
+public:
+	ContiguousContainer();
+	~ContiguousContainer();
+
+	// Use perfect forwarding for pushBack
+	template <typename... Args>
+	void pushBack(Args &&... args);
+
+	void popBack();
+	T & operator[](size_t index);
+	size_t getSize() const;
+
+	// Function to return references to all stored objects
+	std::vector<std::reference_wrapper<T>> getAllReferences();
+
+private:
+	T * mData;
+	size_t mSize;
+	size_t mCapacity;
+
+	void resize(size_t new_capacity); // Resize function to allocate more space
+};
+
+#include "ContiguousContainer.hpp"
diff --git a/mwe/ecs-memory-efficient/inc/ContiguousContainer.hpp b/mwe/ecs-memory-efficient/inc/ContiguousContainer.hpp
new file mode 100644
index 0000000..408d5aa
--- /dev/null
+++ b/mwe/ecs-memory-efficient/inc/ContiguousContainer.hpp
@@ -0,0 +1,84 @@
+template <typename T>
+ContiguousContainer<T>::ContiguousContainer() : mSize(0), mCapacity(10) {
+	// Allocate memory for 10 objects initially
+	mData = static_cast<T *>(malloc(mCapacity * sizeof(T)));
+	if (!mData) {
+		throw std::bad_alloc();
+	}
+}
+
+template <typename T>
+ContiguousContainer<T>::~ContiguousContainer() {
+	// Destroy all constructed objects
+	for (size_t i = 0; i < mSize; ++i) {
+		mData[i].~T();
+	}
+	// Free the allocated memory
+	free(mData);
+}
+
+template <typename T>
+template <typename... Args>
+void ContiguousContainer<T>::pushBack(Args &&... args) {
+	if (mSize == mCapacity) {
+		// Double the capacity if the container is full
+		resize(mCapacity * 2);
+	}
+	// Use placement new with perfect forwarding to construct the object in place
+	new (mData + mSize) T(std::forward<Args>(args)...);
+	++mSize;
+}
+
+template <typename T>
+void ContiguousContainer<T>::popBack() {
+	if (mSize > 0) {
+		--mSize;
+		// Explicitly call the destructor
+		mData[mSize].~T();
+	}
+}
+
+template <typename T>
+T & ContiguousContainer<T>::operator[](size_t index) {
+	if (index >= mSize) {
+		throw std::out_of_range("Index out of range");
+	}
+	return mData[index];
+}
+
+template <typename T>
+size_t ContiguousContainer<T>::getSize() const {
+	return mSize;
+}
+
+// Function that returns a vector of references to all stored objects
+template <typename T>
+std::vector<std::reference_wrapper<T>>
+ContiguousContainer<T>::getAllReferences() {
+	std::vector<std::reference_wrapper<T>> references;
+	references.reserve(mSize); // Reserve space to avoid reallocation
+	for (size_t i = 0; i < mSize; ++i) {
+		references.push_back(std::ref(mData[i]));
+	}
+	return references;
+}
+
+template <typename T>
+void ContiguousContainer<T>::resize(size_t new_capacity) {
+	// Allocate new memory block with the updated capacity
+	T * new_data = static_cast<T *>(malloc(new_capacity * sizeof(T)));
+	if (!new_data) {
+		throw std::bad_alloc();
+	}
+
+	// Move or copy existing objects to the new memory block
+	for (size_t i = 0; i < mSize; ++i) {
+		new (new_data + i) T(std::move(mData[i])); // Move the objects
+		mData[i].~T(); // Call the destructor for the old object
+	}
+
+	// Free the old memory block
+	free(mData);
+	mData = new_data;
+	mCapacity = new_capacity;
+}
diff --git a/mwe/ecs-memory-efficient/inc/GameObjectMax.h b/mwe/ecs-memory-efficient/inc/GameObjectMax.h
new file mode 100644
index 0000000..760e330
--- /dev/null
+++ b/mwe/ecs-memory-efficient/inc/GameObjectMax.h
@@ -0,0 +1,24 @@
+#pragma once
+
+#include <cstdint>
+#include <string>
+
+class GameObject {
+public:
+	GameObject(std::uint32_t id, std::string name, std::string tag, int layer);
+
+	template <typename... Args>
+	void addSpriteComponent(Args &&... args);
+	template <typename... Args>
+	void addRigidbodyComponent(Args &&... args);
+	template <typename... Args>
+	void addColiderComponent(Args &&... args);
+
+	std::uint32_t mId;
+	std::string mName;
+	std::string mTag;
+	bool mActive;
+	int mLayer;
+};
+
+#include "GameObjectMax.hpp"
diff --git a/mwe/ecs-memory-efficient/inc/GameObjectMax.hpp b/mwe/ecs-memory-efficient/inc/GameObjectMax.hpp
new file mode 100644
index 0000000..be3ffa2
--- /dev/null
+++ b/mwe/ecs-memory-efficient/inc/GameObjectMax.hpp
@@ -0,0 +1,19 @@
+#include "ComponentManager.h"
+
+template <typename... Args>
+void GameObject::addSpriteComponent(Args &&... args) {
+	ComponentManager::GetInstance().addSpriteComponent(
+		std::forward<Args>(args)...);
+}
+
+template <typename... Args>
+void GameObject::addRigidbodyComponent(Args &&... args) {
+	ComponentManager::GetInstance().addRigidbodyComponent(
+		std::forward<Args>(args)...);
+}
+
+template <typename... Args>
+void GameObject::addColiderComponent(Args &&... args) {
+	ComponentManager::GetInstance().addColiderComponent(
+		std::forward<Args>(args)...);
+}
diff --git a/mwe/ecs-memory-efficient/src/ComponentManager.cpp b/mwe/ecs-memory-efficient/src/ComponentManager.cpp
new file mode 100644
index 0000000..8c1fd23
--- /dev/null
+++ b/mwe/ecs-memory-efficient/src/ComponentManager.cpp
@@ -0,0 +1,22 @@
+#include "ComponentManager.h"
+
+ComponentManager ComponentManager::mInstance;
+
+ComponentManager & ComponentManager::GetInstance() { return mInstance; }
+
+ComponentManager::ComponentManager() {}
+
+std::vector<std::reference_wrapper<Sprite>>
+ComponentManager::getAllSpriteReferences() {
+	return mSpriteContainer.getAllReferences();
+}
+
+std::vector<std::reference_wrapper<Rigidbody>>
+ComponentManager::getAllRigidbodyReferences() {
+	return mRigidbodyContainer.getAllReferences();
+}
+
+std::vector<std::reference_wrapper<Colider>>
+ComponentManager::getAllColiderReferences() {
+	return mColiderContainer.getAllReferences();
+}
diff --git a/mwe/ecs-memory-efficient/src/Components.cpp b/mwe/ecs-memory-efficient/src/Components.cpp
new file mode 100644
index 0000000..c8347b3
--- /dev/null
+++ b/mwe/ecs-memory-efficient/src/Components.cpp
@@ -0,0 +1,11 @@
+#include "Components.h"
+#include <iostream>
+
+Component::Component() : mActive(true) {}
+
+Sprite::Sprite(std::string path) : mPath(path) {}
+
+Rigidbody::Rigidbody(int mass, int gravityScale, int bodyType)
+	: mMass(mass), mGravityScale(gravityScale), mBodyType(bodyType) {}
+
+Colider::Colider(int size) : mSize(size) {}
diff --git a/mwe/ecs-memory-efficient/src/GameObjectMax.cpp b/mwe/ecs-memory-efficient/src/GameObjectMax.cpp
new file mode 100644
index 0000000..b0c5af7
--- /dev/null
+++ b/mwe/ecs-memory-efficient/src/GameObjectMax.cpp
@@ -0,0 +1,7 @@
+#include "GameObjectMax.h"
+
+#include "ComponentManager.h"
+
+GameObject::GameObject(std::uint32_t id, std::string name, std::string tag,
+					   int layer)
+	: mId(id), mName(name), mTag(tag), mActive(true), mLayer(layer) {}
diff --git a/mwe/ecs-memory-efficient/src/main.cpp b/mwe/ecs-memory-efficient/src/main.cpp
new file mode 100644
index 0000000..9c6f2aa
--- /dev/null
+++ b/mwe/ecs-memory-efficient/src/main.cpp
@@ -0,0 +1,59 @@
+#include <chrono>
+#include <cstdint>
+#include <iostream>
+#include <vector>
+
+#include "ComponentManager.h"
+#include "Components.h"
+#include "GameObjectMax.h"
+
+int main() {
+	auto startAdding = std::chrono::high_resolution_clock::now();
+
+	GameObject * gameObject[100000];
+
+	for (int i = 0; i < 100000; ++i) {
+		gameObject[i] = new GameObject(i, "Name", "Tag", 0);
+
+		gameObject[i]->addSpriteComponent("C:/Test");
+		gameObject[i]->addRigidbodyComponent(0, 0, i);
+		gameObject[i]->addColiderComponent(i);
+	}
+
+	auto stopAdding = std::chrono::high_resolution_clock::now();
+
+	//This is what systems would do:
+
+	std::vector<std::reference_wrapper<Sprite>> allSprites
+		= ComponentManager::GetInstance().getAllSpriteReferences();
+	for (Sprite & sprite : allSprites) {
+		//std::cout << sprite.mPath << std::endl;
+	}
+	//std::cout << std::endl;
+
+	std::vector<std::reference_wrapper<Rigidbody>> allRigidbody
+		= ComponentManager::GetInstance().getAllRigidbodyReferences();
+	for (Rigidbody & rigidbody : allRigidbody) {
+		//std::cout << rigidbody.mMass << " " << rigidbody.mGravityScale << " " << rigidbody.mBodyType << std::endl;
+	}
+	//std::cout << std::endl;
+
+	std::vector<std::reference_wrapper<Colider>> allColider
+		= ComponentManager::GetInstance().getAllColiderReferences();
+	for (Colider & colider : allColider) {
+		//std::cout << colider.mSize << std::endl;
+	}
+
+	auto stopLooping = std::chrono::high_resolution_clock::now();
+
+	for (int i = 0; i < 100000; ++i) {
+		delete gameObject[i];
+	}
+
+	auto Addtime = std::chrono::duration_cast<std::chrono::microseconds>(
+		stopAdding - startAdding);
+	auto LoopTime = std::chrono::duration_cast<std::chrono::microseconds>(
+		stopLooping - stopAdding);
+	std::cout << "AddTime: " << Addtime.count() << " us" << std::endl;
+	std::cout << "LoopTime: " << LoopTime.count() << " us" << std::endl;
+}
diff --git a/mwe/gameloop/include/gameObject.h b/mwe/gameloop/include/gameObject.h
index 69f4d52..abdc9b0 100644
--- a/mwe/gameloop/include/gameObject.h
+++ b/mwe/gameloop/include/gameObject.h
@@ -19,6 +19,7 @@ public:
 	void setHeight(float value);
 	void setVelX(float value);
 	void setVelY(float value);
+	int direction;
 
 private:
 	std::string name = "";
diff --git a/mwe/gameloop/include/timer.h b/mwe/gameloop/include/timer.h
index 22383b2..8273746 100644
--- a/mwe/gameloop/include/timer.h
+++ b/mwe/gameloop/include/timer.h
@@ -13,6 +13,8 @@ public:
 	double getFixedDeltaTime() const;
 	void setFPS(int FPS);
 	int getFPS() const;
+	double getGameScale();
+	void setGameScale(double);
 	void enforceFrameRate();
 	double getLag() const;
 
diff --git a/mwe/gameloop/src/loopManager.cpp b/mwe/gameloop/src/loopManager.cpp
index cb532cc..0392853 100644
--- a/mwe/gameloop/src/loopManager.cpp
+++ b/mwe/gameloop/src/loopManager.cpp
@@ -11,7 +11,14 @@ void LoopManager::processInput() {
 		case SDL_KEYDOWN:
 			if (event.key.keysym.sym == SDLK_ESCAPE) {
 				gameRunning = false;
+			} else if (event.key.keysym.sym == SDLK_i) {
+				LoopTimer::getInstance().setGameScale(
+					LoopTimer::getInstance().getGameScale() + 0.1);
+			} else if (event.key.keysym.sym == SDLK_k) {
+				LoopTimer::getInstance().setGameScale(
+					LoopTimer::getInstance().getGameScale() - 0.1);
 			}
+
 			break;
 	}
 }
@@ -41,11 +48,11 @@ void LoopManager::loop() {
 void LoopManager::setup() {
 	gameRunning = window.initWindow();
 	LoopTimer::getInstance().start();
-	LoopTimer::getInstance().setFPS(50);
+	LoopTimer::getInstance().setFPS(500);
 
-	for (int i = 0; i < 2; i++) {
+	for (int i = 1; i < 3; i++) {
 		GameObject * square
-			= new GameObject("square2", i * 40, i * 40, 20, 20, 0, 0);
+			= new GameObject("square2", i * 60, i * 60, 20, 20, 0, 0);
 		objectList.push_back(square);
 	}
 }
@@ -57,13 +64,26 @@ void LoopManager::render() {
 }
 
 void LoopManager::update() {
-	fprintf(stderr, "**********normal update********** \n");
+	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);
+		GameObject * obj = objectList[i];
+
+		// Move the object based on its direction
+		if (obj->direction == 1) {
+			obj->setX(obj->getX() + 50 * delta);
+		} else {
+			obj->setX(obj->getX() - 50 * delta);
+		}
+
+		if (obj->getX() > 500) {
+			obj->setX(500);
+			obj->direction = 0; // Switch direction to left
+		} else if (obj->getX() < 50) {
+			obj->setX(50); // Clamp the position to the boundary
+			obj->direction = 1; // Switch direction to right
+		}
 	}
 }
diff --git a/mwe/gameloop/src/main.cpp b/mwe/gameloop/src/main.cpp
index 889a30a..c0f216a 100644
--- a/mwe/gameloop/src/main.cpp
+++ b/mwe/gameloop/src/main.cpp
@@ -4,9 +4,6 @@
 //#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;
diff --git a/mwe/gameloop/src/timer.cpp b/mwe/gameloop/src/timer.cpp
index 61e144d..97baef6 100644
--- a/mwe/gameloop/src/timer.cpp
+++ b/mwe/gameloop/src/timer.cpp
@@ -1,15 +1,11 @@
 #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;
@@ -17,16 +13,14 @@ void LoopTimer::start() {
 	deltaTime = 0;
 }
 
-// Update the timer, calculate deltaTime
 void LoopTimer::update() {
 	uint64_t currentFrameTime = SDL_GetTicks64();
-	deltaTime
-		= (currentFrameTime - lastFrameTime) / 1000.0; // Convert to seconds
+	deltaTime = (currentFrameTime - lastFrameTime) / 1000.0;
 
 	if (deltaTime > maximumDeltaTime) {
 		deltaTime = maximumDeltaTime;
 	}
-
+	deltaTime *= gameScale;
 	elapsedTime += deltaTime;
 	lastFrameTime = currentFrameTime;
 }
@@ -44,7 +38,8 @@ void LoopTimer::setFPS(int FPS) {
 }
 
 int LoopTimer::getFPS() const { return FPS; }
-
+void LoopTimer::setGameScale(double value) { gameScale = value; };
+double LoopTimer::getGameScale() { return gameScale; }
 void LoopTimer::enforceFrameRate() {
 	uint64_t currentFrameTime = SDL_GetTicks64();
 	double frameDuration = (currentFrameTime - lastFrameTime) / 1000.0;
diff --git a/readme.md b/readme.md
index f3aab09..24bb66f 100644
--- a/readme.md
+++ b/readme.md
@@ -7,18 +7,46 @@ This repository contains:
 |`lib/`|third-party libraries as git submodules|
 |`mwe/`|minimal working examples and proof-of-concepts|
 |`src/crepe/`|game engine source code|
-|`test/`|game engine unit tests|
+|`src/test/`|unit tests|
+|`src/example/`|standalone examples using game engine|
 
 ## Compilation
 
 This repository uses CMake (the makefile in the root of this repository is for
-running auxiliary tasks only). Make sure you have initialized and updated the
-submodules before compiling.
+running auxiliary tasks only). See [src/readme.md](src/readme.md) for detailed
+building instructions.
+
+## Installing libraries
+
+The expected library (source) versions are included in this repository as git
+submodules. Follow these steps for manually building one of the required
+libraries from source:
+
+1. Ensure the git submodules are initialized:
+   ```
+   $ git submodule update --init --recursive --depth 1
+   ```
+2. `cd` into the library source folder:
+   ```
+   $ cd lib/googletest
+   or
+   $ cd lib/sdl2
+   or
+   $ cd lib/soloud/contrib
+   ```
+3. Configure the build, run the build and install:
+   ```
+   $ cmake -B build -G Ninja
+   $ ninja -C build
+   # ninja -C build install
+   ```
 
 ## Documentation
 
-API documentation is done using Doxygen. To generate the docs, run `make
-doxygen`.
+API documentation is done using Doxygen. To generate the docs, run
+```
+$ make doxygen
+```
 
 ## Code style
 
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 0090188..09c60bd 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -3,14 +3,37 @@ cmake_minimum_required(VERSION 3.28)
 set(CMAKE_C_STANDARD 11)
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_EXPORT_COMPILE_COMMANDS 1)
-
-# enable debug features
 set(CMAKE_BUILD_TYPE Debug)
-add_compile_definitions(DEBUG)
 
 project(crepe C CXX)
 
-add_executable(main)
+find_package(SDL2 REQUIRED)
+find_package(SoLoud REQUIRED)
+find_package(GTest REQUIRED)
+
+add_library(crepe SHARED)
+add_executable(test_main EXCLUDE_FROM_ALL)
+
+target_include_directories(crepe
+	PUBLIC SYSTEM INTERFACE .
+)
+
+target_link_libraries(crepe
+	PRIVATE soloud
+	PRIVATE SDL2
+)
 
 add_subdirectory(crepe)
+add_subdirectory(test)
+add_subdirectory(example)
+
+install(
+	TARGETS crepe
+	FILE_SET HEADERS DESTINATION include/crepe
+)
+
+target_link_libraries(test_main
+	PRIVATE gtest_main
+	PUBLIC crepe
+)
 
diff --git a/src/crepe/Asset.cpp b/src/crepe/Asset.cpp
new file mode 100644
index 0000000..15ddc27
--- /dev/null
+++ b/src/crepe/Asset.cpp
@@ -0,0 +1,14 @@
+#include <filesystem>
+
+#include "Asset.h"
+
+using namespace crepe;
+
+Asset::Asset(const std::string & src) {
+	this->src = std::filesystem::canonical(src);
+	this->file = std::ifstream(this->src, std::ios::in | std::ios::binary);
+}
+
+const std::istream & Asset::read() { return this->file; }
+
+const char * Asset::canonical() { return this->src.c_str(); }
diff --git a/src/crepe/Asset.h b/src/crepe/Asset.h
new file mode 100644
index 0000000..0cb5834
--- /dev/null
+++ b/src/crepe/Asset.h
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <fstream>
+#include <iostream>
+#include <string>
+
+namespace crepe {
+
+/**
+ * \brief Asset location helper
+ *
+ * This class is used to locate and canonicalize paths to game asset files, and
+ * should *always* be used when retrieving files from disk.
+ */
+class Asset {
+public:
+	/**
+	 * \param src  Unique identifier to asset
+	 */
+	Asset(const std::string & src);
+
+public:
+	//! Get an input stream to the contents of this resource
+	const std::istream & read();
+	//! Get the canonical path to this resource
+	const char * canonical();
+
+private:
+	std::string src;
+	std::ifstream file;
+};
+
+} // namespace crepe
diff --git a/src/crepe/CMakeLists.txt b/src/crepe/CMakeLists.txt
index 392b7d7..cfa51fb 100644
--- a/src/crepe/CMakeLists.txt
+++ b/src/crepe/CMakeLists.txt
@@ -1,3 +1,23 @@
-target_sources(main PUBLIC
-	main.cpp
+target_sources(crepe PUBLIC
+	Asset.cpp
+	Sound.cpp
+	SoundContext.cpp
+	ComponentManager.cpp
+	Component.cpp
+	ScriptSystem.cpp
 )
+
+target_sources(crepe PUBLIC FILE_SET HEADERS FILES
+	Asset.h
+	Sound.h
+	SoundContext.h
+	ComponentManager.h
+	ComponentManager.hpp
+	Component.h
+	System.h
+	ScriptSystem.h
+)
+
+add_subdirectory(api)
+add_subdirectory(util)
+
diff --git a/src/crepe/Component.cpp b/src/crepe/Component.cpp
new file mode 100644
index 0000000..bce90f1
--- /dev/null
+++ b/src/crepe/Component.cpp
@@ -0,0 +1,3 @@
+#include "Component.h"
+
+using namespace crepe;
diff --git a/src/crepe/Component.h b/src/crepe/Component.h
new file mode 100644
index 0000000..9cda177
--- /dev/null
+++ b/src/crepe/Component.h
@@ -0,0 +1,16 @@
+#pragma once
+
+namespace crepe {
+
+class Component {
+protected:
+	Component() = default;
+
+public:
+	virtual ~Component() = default;
+
+public:
+	bool active = true;
+};
+
+} // namespace crepe
diff --git a/src/crepe/ComponentManager.cpp b/src/crepe/ComponentManager.cpp
new file mode 100644
index 0000000..8bde33a
--- /dev/null
+++ b/src/crepe/ComponentManager.cpp
@@ -0,0 +1,29 @@
+#include "ComponentManager.h"
+#include "util/log.h"
+
+using namespace crepe;
+
+ComponentManager & ComponentManager::get_instance() {
+	static ComponentManager instance;
+	return instance;
+}
+
+void ComponentManager::delete_all_components_of_id(uint32_t id) {
+	// Loop through all the types (in the unordered_map<>)
+	for (auto & [type, componentArray] : components) {
+		// Make sure that the id (that we are looking for) is within the boundaries of the vector<>
+		if (id < componentArray.size()) {
+			// Clear the components at this specific id
+			componentArray[id].clear();
+		}
+	}
+}
+
+void ComponentManager::delete_all_components() {
+	// Clear the whole unordered_map<>
+	this->components.clear();
+}
+
+ComponentManager::ComponentManager() { dbg_trace(); }
+
+ComponentManager::~ComponentManager() { dbg_trace(); }
diff --git a/src/crepe/ComponentManager.h b/src/crepe/ComponentManager.h
new file mode 100644
index 0000000..38f32e4
--- /dev/null
+++ b/src/crepe/ComponentManager.h
@@ -0,0 +1,63 @@
+#pragma once
+
+#include <cstdint>
+#include <memory>
+#include <typeindex>
+#include <unordered_map>
+#include <utility>
+#include <vector>
+
+#include "Component.h"
+
+namespace crepe {
+
+class ComponentManager {
+public:
+	// Singleton
+	static ComponentManager & get_instance();
+	ComponentManager(const ComponentManager &) = delete;
+	ComponentManager(ComponentManager &&) = delete;
+	ComponentManager & operator=(const ComponentManager &) = delete;
+	ComponentManager & operator=(ComponentManager &&) = delete;
+
+public:
+	//! Add a component of a specific type
+	template <typename T, typename... Args>
+	T & add_component(uint32_t id, Args &&... args);
+	//! Deletes all components of a specific type and id
+	template <typename T>
+	void delete_components_by_id(uint32_t id);
+	//! Deletes all components of a specific type
+	template <typename T>
+	void delete_components();
+	//! Deletes all components of a specific id
+	void delete_all_components_of_id(uint32_t id);
+	//! Deletes all components
+	void delete_all_components();
+
+	//! Get a vector<> of all components at specific type and id
+	template <typename T>
+	std::vector<std::reference_wrapper<T>>
+	get_components_by_id(uint32_t id) const;
+	//! Get a vector<> of all components of a specific type
+	template <typename T>
+	std::vector<std::reference_wrapper<T>> get_components_by_type() const;
+
+private:
+	ComponentManager();
+	virtual ~ComponentManager();
+
+	/*
+	 * The std::unordered_map<std::type_index, std::vector<std::vector<std::unique_ptr<Component>>>> below might seem a bit strange, let me explain this structure:
+	 * The std::unordered_map<> has a key and value. The key is a std::type_index and the value is a std::vector. So, a new std::vector will be created for each new std::type_index.
+	 * The first std::vector<> stores another vector<>. This first vector<> is to bind the entity's id to a component.
+	 * The second std::vector<> stores unique_ptrs. Each component can be gathered via an unique_ptr. This second vector<> allows multiple components of the same std::type_index for one entity (id).
+	 */
+	std::unordered_map<std::type_index,
+					   std::vector<std::vector<std::unique_ptr<Component>>>>
+		components;
+};
+
+} // namespace crepe
+
+#include "ComponentManager.hpp"
diff --git a/src/crepe/ComponentManager.hpp b/src/crepe/ComponentManager.hpp
new file mode 100644
index 0000000..2377a94
--- /dev/null
+++ b/src/crepe/ComponentManager.hpp
@@ -0,0 +1,147 @@
+#pragma once
+
+#include <type_traits>
+
+#include "ComponentManager.h"
+
+namespace crepe {
+
+template <class T, typename... Args>
+T & ComponentManager::add_component(uint32_t id, Args &&... args) {
+	using namespace std;
+
+	static_assert(is_base_of<Component, T>::value,
+				  "add_component must recieve a derivative class of Component");
+
+	// Determine the type of T (this is used as the key of the unordered_map<>)
+	type_index type = typeid(T);
+
+	// Check if this component type is already in the unordered_map<>
+	if (components.find(type) == components.end()) {
+		//If not, create a new (empty) vector<> of vector<unique_ptr<Component>>
+		components[type] = vector<vector<unique_ptr<Component>>>();
+	}
+
+	// Resize the vector<> if the id is greater than the current size
+	if (id >= components[type].size()) {
+		// Initialize new slots to nullptr (resize does automatically init to nullptr)
+		components[type].resize(id + 1);
+	}
+
+	// Create a new component of type T (arguments directly forwarded). The
+	// constructor must be called by ComponentManager.
+	T * instance = new T(forward<Args>(args)...);
+	// store its unique_ptr in the vector<>
+	components[type][id].push_back(unique_ptr<T>(instance));
+
+	return *instance;
+}
+
+template <typename T>
+void ComponentManager::delete_components_by_id(uint32_t id) {
+	using namespace std;
+
+	// Determine the type of T (this is used as the key of the unordered_map<>)
+	type_index type = typeid(T);
+
+	// Find the type (in the unordered_map<>)
+	if (components.find(type) != components.end()) {
+		// Get the correct vector<>
+		vector<vector<unique_ptr<Component>>> & component_array
+			= components[type];
+
+		// Make sure that the id (that we are looking for) is within the boundaries of the vector<>
+		if (id < component_array.size()) {
+			// Clear the whole vector<> of this specific type and id
+			component_array[id].clear();
+		}
+	}
+}
+
+template <typename T>
+void ComponentManager::delete_components() {
+	// Determine the type of T (this is used as the key of the unordered_map<>)
+	std::type_index type = typeid(T);
+
+	if (components.find(type) == components.end()) return;
+
+	components[type].clear();
+}
+
+template <typename T>
+std::vector<std::reference_wrapper<T>>
+ComponentManager::get_components_by_id(uint32_t id) const {
+	using namespace std;
+
+	// Determine the type of T (this is used as the key of the unordered_map<>)
+	type_index type = typeid(T);
+
+	// Create an empty vector<>
+	vector<reference_wrapper<T>> component_vector;
+
+	if (components.find(type) == components.end()) return component_vector;
+
+	// Get the correct vector<>
+	const vector<vector<unique_ptr<Component>>> & component_array
+		= components.at(type);
+
+	// Make sure that the id (that we are looking for) is within the boundaries of the vector<>
+	if (id >= component_array.size()) return component_vector;
+
+	// Loop trough the whole vector<>
+	for (const unique_ptr<Component> & component_ptr : component_array[id]) {
+		// Cast the unique_ptr to a raw pointer
+		T * casted_component = static_cast<T *>(component_ptr.get());
+
+		if (casted_component == nullptr) continue;
+
+		// Add the dereferenced raw pointer to the vector<>
+		component_vector.push_back(*casted_component);
+	}
+
+	return component_vector;
+}
+
+template <typename T>
+std::vector<std::reference_wrapper<T>>
+ComponentManager::get_components_by_type() const {
+	using namespace std;
+
+	// Determine the type of T (this is used as the key of the unordered_map<>)
+	type_index type = typeid(T);
+
+	// Create an empty vector<>
+	vector<reference_wrapper<T>> component_vector;
+	// Set the id to 0 (the id will also be stored in the returned vector<>)
+	// uint32_t id = 0;
+
+	// Find the type (in the unordered_map<>)
+	if (components.find(type) == components.end()) return component_vector;
+
+	// Get the correct vector<>
+	const vector<vector<unique_ptr<Component>>> & component_array
+		= components.at(type);
+
+	// Loop through the whole vector<>
+	for (const vector<unique_ptr<Component>> & component : component_array) {
+		// Loop trough the whole vector<>
+		for (const unique_ptr<Component> & component_ptr : component) {
+			// Cast the unique_ptr to a raw pointer
+			T * casted_component = static_cast<T *>(component_ptr.get());
+
+			// Ensure that the cast was successful
+			if (casted_component == nullptr) continue;
+
+			// Pair the dereferenced raw pointer and the id and add it to the vector<>
+			component_vector.emplace_back(ref(*casted_component));
+		}
+
+		// Increase the id (the id will also be stored in the returned vector<>)
+		//++id;
+	}
+
+	// Return the vector<>
+	return component_vector;
+}
+
+} // namespace crepe
diff --git a/src/crepe/ScriptSystem.cpp b/src/crepe/ScriptSystem.cpp
new file mode 100644
index 0000000..5d882be
--- /dev/null
+++ b/src/crepe/ScriptSystem.cpp
@@ -0,0 +1,45 @@
+#include <forward_list>
+#include <functional>
+#include <vector>
+
+#include "ComponentManager.h"
+#include "ScriptSystem.h"
+#include "api/BehaviorScript.h"
+#include "api/Script.h"
+#include "util/log.h"
+
+using namespace std;
+using namespace crepe;
+using namespace crepe::api;
+
+ScriptSystem::ScriptSystem() { dbg_trace(); }
+ScriptSystem::~ScriptSystem() { dbg_trace(); }
+
+ScriptSystem & ScriptSystem::get_instance() {
+	static ScriptSystem instance;
+	return instance;
+}
+
+void ScriptSystem::update() {
+	using namespace std;
+	dbg_trace();
+
+	forward_list<Script *> scripts = this->get_scripts();
+	for (Script * script : scripts) script->update();
+}
+
+forward_list<Script *> ScriptSystem::get_scripts() {
+	forward_list<Script *> scripts = {};
+	ComponentManager & mgr = ComponentManager::get_instance();
+	vector<reference_wrapper<BehaviorScript>> behavior_scripts
+		= mgr.get_components_by_type<BehaviorScript>();
+
+	for (auto behavior_script_ref : behavior_scripts) {
+		BehaviorScript & behavior_script = behavior_script_ref.get();
+		Script * script = behavior_script.script.get();
+		if (script == nullptr) continue;
+		scripts.push_front(script);
+	}
+
+	return scripts;
+}
diff --git a/src/crepe/ScriptSystem.h b/src/crepe/ScriptSystem.h
new file mode 100644
index 0000000..1f472a0
--- /dev/null
+++ b/src/crepe/ScriptSystem.h
@@ -0,0 +1,26 @@
+#pragma once
+
+#include <forward_list>
+
+#include "System.h"
+
+namespace crepe::api {
+class Script;
+}
+
+namespace crepe {
+
+class ScriptSystem : public System {
+public:
+	static ScriptSystem & get_instance();
+	void update();
+
+private:
+	ScriptSystem();
+	~ScriptSystem();
+
+private:
+	std::forward_list<api::Script *> get_scripts();
+};
+
+} // namespace crepe
diff --git a/src/crepe/Sound.cpp b/src/crepe/Sound.cpp
new file mode 100644
index 0000000..64fa281
--- /dev/null
+++ b/src/crepe/Sound.cpp
@@ -0,0 +1,60 @@
+#include "util/log.h"
+
+#include "Sound.h"
+#include "SoundContext.h"
+
+using namespace crepe;
+
+Sound::Sound(std::unique_ptr<Asset> res) {
+	dbg_trace();
+	this->load(std::move(res));
+}
+
+Sound::Sound(const char * src) {
+	dbg_trace();
+	this->load(std::make_unique<Asset>(src));
+}
+
+void Sound::load(std::unique_ptr<Asset> res) {
+	this->sample.load(res->canonical());
+}
+
+void Sound::play() {
+	SoundContext & ctx = SoundContext::get_instance();
+	if (ctx.engine.getPause(this->handle)) {
+		// resume if paused
+		ctx.engine.setPause(this->handle, false);
+	} else {
+		// or start new sound
+		this->handle = ctx.engine.play(this->sample, this->volume);
+		ctx.engine.setLooping(this->handle, this->looping);
+	}
+}
+
+void Sound::pause() {
+	SoundContext & ctx = SoundContext::get_instance();
+	if (ctx.engine.getPause(this->handle)) return;
+	ctx.engine.setPause(this->handle, true);
+}
+
+void Sound::rewind() {
+	SoundContext & ctx = SoundContext::get_instance();
+	if (!ctx.engine.isValidVoiceHandle(this->handle)) return;
+	ctx.engine.seek(this->handle, 0);
+}
+
+void Sound::set_volume(float volume) {
+	this->volume = volume;
+
+	SoundContext & ctx = SoundContext::get_instance();
+	if (!ctx.engine.isValidVoiceHandle(this->handle)) return;
+	ctx.engine.setVolume(this->handle, this->volume);
+}
+
+void Sound::set_looping(bool looping) {
+	this->looping = looping;
+
+	SoundContext & ctx = SoundContext::get_instance();
+	if (!ctx.engine.isValidVoiceHandle(this->handle)) return;
+	ctx.engine.setLooping(this->handle, this->looping);
+}
diff --git a/src/crepe/Sound.h b/src/crepe/Sound.h
new file mode 100644
index 0000000..b7cfbb8
--- /dev/null
+++ b/src/crepe/Sound.h
@@ -0,0 +1,82 @@
+#pragma once
+
+#include <soloud/soloud.h>
+#include <soloud/soloud_wav.h>
+
+#include <memory>
+
+#include "Asset.h"
+
+namespace crepe {
+
+class Sound {
+public:
+	/**
+	 * \brief Pause this sample
+	 *
+	 * Pauses this sound if it is playing, or does nothing if it is already
+	 * paused. The playhead position is saved, such that calling \c play() after
+	 * this function makes the sound resume.
+	 */
+	void pause();
+	/**
+	 * \brief Play this sample
+	 *
+	 * Resume playback if this sound is paused, or start from the beginning of
+	 * the sample.
+	 *
+	 * \note This class only saves a reference to the most recent 'voice' of this
+	 * sound. Calling \c play() while the sound is already playing causes
+	 * multiple instances of the sample to play simultaniously. The sample
+	 * started last is the one that is controlled afterwards.
+	 */
+	void play();
+	/**
+	 * \brief Reset playhead position
+	 * 
+	 * Resets the playhead position so that calling \c play() after this function
+	 * makes it play from the start of the sample. If the sound is not paused
+	 * before calling this function, this function will stop playback.
+	 */
+	void rewind();
+	/**
+	 * \brief Set playback volume / gain
+	 *
+	 * \param volume  Volume (0 = muted, 1 = full volume)
+	 */
+	void set_volume(float volume);
+	/**
+	 * \brief Get playback volume / gain
+	 *
+	 * \return Volume
+	 */
+	float get_volume() const { return this->volume; }
+	/**
+	 * \brief Set looping behavior for this sample
+	 *
+	 * \param looping  Looping behavior (false = one-shot, true = loop)
+	 */
+	void set_looping(bool looping);
+	/**
+	 * \brief Get looping behavior
+	 *
+	 * \return true if looping, false if one-shot
+	 */
+	bool get_looping() const { return this->looping; }
+
+public:
+	Sound(const char * src);
+	Sound(std::unique_ptr<Asset> res);
+
+private:
+	void load(std::unique_ptr<Asset> res);
+
+private:
+	SoLoud::Wav sample;
+	SoLoud::handle handle;
+
+	float volume = 1.0f;
+	bool looping = false;
+};
+
+} // namespace crepe
diff --git a/src/crepe/SoundContext.cpp b/src/crepe/SoundContext.cpp
new file mode 100644
index 0000000..72047d2
--- /dev/null
+++ b/src/crepe/SoundContext.cpp
@@ -0,0 +1,20 @@
+#include "util/log.h"
+
+#include "SoundContext.h"
+
+using namespace crepe;
+
+SoundContext & SoundContext::get_instance() {
+	static SoundContext instance;
+	return instance;
+}
+
+SoundContext::SoundContext() {
+	dbg_trace();
+	engine.init();
+}
+
+SoundContext::~SoundContext() {
+	dbg_trace();
+	engine.deinit();
+}
diff --git a/src/crepe/SoundContext.h b/src/crepe/SoundContext.h
new file mode 100644
index 0000000..d3123d2
--- /dev/null
+++ b/src/crepe/SoundContext.h
@@ -0,0 +1,26 @@
+#pragma once
+
+#include <soloud/soloud.h>
+
+#include "Sound.h"
+
+namespace crepe {
+
+class SoundContext {
+private:
+	SoundContext();
+	virtual ~SoundContext();
+
+	// singleton
+	static SoundContext & get_instance();
+	SoundContext(const SoundContext &) = delete;
+	SoundContext(SoundContext &&) = delete;
+	SoundContext & operator=(const SoundContext &) = delete;
+	SoundContext & operator=(SoundContext &&) = delete;
+
+private:
+	SoLoud::Soloud engine;
+	friend class Sound;
+};
+
+} // namespace crepe
diff --git a/src/crepe/System.h b/src/crepe/System.h
new file mode 100644
index 0000000..ecbb7f5
--- /dev/null
+++ b/src/crepe/System.h
@@ -0,0 +1,22 @@
+#pragma once
+
+namespace crepe {
+
+class System {
+public:
+	static System & get_instance();
+	virtual void update() = 0;
+
+protected:
+	System() {};
+	virtual ~System() {};
+
+private:
+	// singleton
+	System(const System &) = delete;
+	System(System &&) = delete;
+	System & operator=(const System &) = delete;
+	System & operator=(System &&) = delete;
+};
+
+} // namespace crepe
diff --git a/src/crepe/api/AudioSource.cpp b/src/crepe/api/AudioSource.cpp
new file mode 100644
index 0000000..bb067dc
--- /dev/null
+++ b/src/crepe/api/AudioSource.cpp
@@ -0,0 +1,23 @@
+#include <memory>
+
+#include "AudioSource.h"
+
+#include "../Sound.h"
+
+using namespace crepe::api;
+
+AudioSource::AudioSource(std::unique_ptr<Asset> audio_clip) {
+	this->sound = std::make_unique<crepe::Sound>(std::move(audio_clip));
+}
+
+void AudioSource::play() { return this->play(false); }
+
+void AudioSource::play(bool looping) {
+	this->sound->set_looping(looping);
+	this->sound->play();
+}
+
+void AudioSource::stop() {
+	this->sound->pause();
+	this->sound->rewind();
+}
diff --git a/src/crepe/api/AudioSource.h b/src/crepe/api/AudioSource.h
new file mode 100644
index 0000000..7980212
--- /dev/null
+++ b/src/crepe/api/AudioSource.h
@@ -0,0 +1,41 @@
+#pragma once
+
+#include <memory>
+
+#include "../Asset.h"
+#include "../Component.h"
+
+namespace crepe {
+class Sound;
+}
+
+namespace crepe::api {
+
+//! Audio source component
+class AudioSource : Component {
+public:
+	AudioSource(std::unique_ptr<Asset> audio_clip);
+	virtual ~AudioSource() = default;
+
+public:
+	//! Start or resume this audio source
+	void play();
+	void play(bool looping);
+	//! Stop this audio source
+	void stop();
+
+public:
+	//! Sample file location
+	std::unique_ptr<Asset> audio_clip;
+	//! TODO: ?????
+	bool play_on_awake;
+	//! Repeat the current audio clip during playback
+	bool loop;
+	//! Normalized volume (0.0 - 1.0)
+	float volume;
+
+private:
+	std::unique_ptr<crepe::Sound> sound;
+};
+
+} // namespace crepe::api
diff --git a/src/crepe/api/BehaviorScript.cpp b/src/crepe/api/BehaviorScript.cpp
new file mode 100644
index 0000000..84bfd4c
--- /dev/null
+++ b/src/crepe/api/BehaviorScript.cpp
@@ -0,0 +1,7 @@
+#include "../util/log.h"
+
+#include "BehaviorScript.h"
+
+using namespace crepe::api;
+
+BehaviorScript::BehaviorScript() { dbg_trace(); }
diff --git a/src/crepe/api/BehaviorScript.h b/src/crepe/api/BehaviorScript.h
new file mode 100644
index 0000000..25d3cc5
--- /dev/null
+++ b/src/crepe/api/BehaviorScript.h
@@ -0,0 +1,36 @@
+#pragma once
+
+#include <memory>
+
+#include "../Component.h"
+#include "Script.h"
+
+namespace crepe {
+class ScriptSystem;
+class ComponentManager;
+} // namespace crepe
+
+namespace crepe::api {
+
+class Script;
+
+class BehaviorScript : public Component {
+protected:
+	friend class crepe::ComponentManager;
+	BehaviorScript();
+
+public:
+	virtual ~BehaviorScript() = default;
+
+public:
+	template <class T>
+	BehaviorScript & set_script();
+
+protected:
+	friend class crepe::ScriptSystem;
+	std::unique_ptr<Script> script = nullptr;
+};
+
+} // namespace crepe::api
+
+#include "BehaviorScript.hpp"
diff --git a/src/crepe/api/BehaviorScript.hpp b/src/crepe/api/BehaviorScript.hpp
new file mode 100644
index 0000000..a6bd81c
--- /dev/null
+++ b/src/crepe/api/BehaviorScript.hpp
@@ -0,0 +1,19 @@
+#pragma once
+
+#include <type_traits>
+
+#include "../util/log.h"
+#include "BehaviorScript.h"
+
+namespace crepe::api {
+
+template <class T>
+BehaviorScript & BehaviorScript::set_script() {
+	static_assert(std::is_base_of<Script, T>::value);
+	dbg_trace();
+	Script * s = new T();
+	this->script = std::unique_ptr<Script>(s);
+	return *this;
+}
+
+} // namespace crepe::api
diff --git a/src/crepe/api/CMakeLists.txt b/src/crepe/api/CMakeLists.txt
new file mode 100644
index 0000000..ae92f3d
--- /dev/null
+++ b/src/crepe/api/CMakeLists.txt
@@ -0,0 +1,21 @@
+target_sources(crepe PUBLIC
+	# AudioSource.cpp
+	BehaviorScript.cpp
+	Script.cpp
+	GameObject.cpp
+	Collider.cpp
+	Rigidbody.cpp
+	Sprite.cpp
+)
+
+target_sources(crepe PUBLIC FILE_SET HEADERS FILES
+	# AudioSource.h
+	BehaviorScript.h
+	Script.h
+	GameObject.h
+	GameObject.hpp
+	Collider.h
+	Rigidbody.h
+	Sprite.h
+)
+
diff --git a/src/crepe/api/Collider.cpp b/src/crepe/api/Collider.cpp
new file mode 100644
index 0000000..6370a42
--- /dev/null
+++ b/src/crepe/api/Collider.cpp
@@ -0,0 +1,5 @@
+#include "Collider.h"
+
+using namespace crepe::api;
+
+Collider::Collider(int size) : size(size) {}
diff --git a/src/crepe/api/Collider.h b/src/crepe/api/Collider.h
new file mode 100644
index 0000000..72d8e77
--- /dev/null
+++ b/src/crepe/api/Collider.h
@@ -0,0 +1,14 @@
+#pragma once
+
+#include "../Component.h"
+
+namespace crepe::api {
+
+class Collider : public Component {
+public:
+	Collider(int size);
+
+	int size;
+};
+
+} // namespace crepe::api
diff --git a/src/crepe/api/GameObject.cpp b/src/crepe/api/GameObject.cpp
new file mode 100644
index 0000000..b167187
--- /dev/null
+++ b/src/crepe/api/GameObject.cpp
@@ -0,0 +1,7 @@
+#include "GameObject.h"
+
+using namespace crepe::api;
+using namespace std;
+
+GameObject::GameObject(uint32_t id, string name, string tag, int layer)
+	: id(id), name(name), tag(tag), active(true), layer(layer) {}
diff --git a/src/crepe/api/GameObject.h b/src/crepe/api/GameObject.h
new file mode 100644
index 0000000..57508c5
--- /dev/null
+++ b/src/crepe/api/GameObject.h
@@ -0,0 +1,24 @@
+#pragma once
+
+#include <cstdint>
+#include <string>
+
+namespace crepe::api {
+
+class GameObject {
+public:
+	GameObject(uint32_t id, std::string name, std::string tag, int layer);
+
+	template <typename T, typename... Args>
+	T & add_component(Args &&... args);
+
+	uint32_t id;
+	std::string name;
+	std::string tag;
+	bool active;
+	int layer;
+};
+
+} // namespace crepe::api
+
+#include "GameObject.hpp"
diff --git a/src/crepe/api/GameObject.hpp b/src/crepe/api/GameObject.hpp
new file mode 100644
index 0000000..8295ea3
--- /dev/null
+++ b/src/crepe/api/GameObject.hpp
@@ -0,0 +1,15 @@
+#pragma once
+
+#include "../ComponentManager.h"
+
+#include "GameObject.h"
+
+namespace crepe::api {
+
+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::api
diff --git a/src/crepe/api/Rigidbody.cpp b/src/crepe/api/Rigidbody.cpp
new file mode 100644
index 0000000..98d1d60
--- /dev/null
+++ b/src/crepe/api/Rigidbody.cpp
@@ -0,0 +1,6 @@
+#include "Rigidbody.h"
+
+using namespace crepe::api;
+
+Rigidbody::Rigidbody(int mass, int gravityScale, int bodyType)
+	: mass(mass), gravity_scale(gravityScale), body_type(bodyType) {}
diff --git a/src/crepe/api/Rigidbody.h b/src/crepe/api/Rigidbody.h
new file mode 100644
index 0000000..6cae579
--- /dev/null
+++ b/src/crepe/api/Rigidbody.h
@@ -0,0 +1,16 @@
+#pragma once
+
+#include "../Component.h"
+
+namespace crepe::api {
+
+class Rigidbody : public Component {
+public:
+	Rigidbody(int mass, int gravityScale, int bodyType);
+
+	int mass;
+	int gravity_scale;
+	int body_type;
+};
+
+} // namespace crepe::api
diff --git a/src/crepe/api/Script.cpp b/src/crepe/api/Script.cpp
new file mode 100644
index 0000000..5016ed0
--- /dev/null
+++ b/src/crepe/api/Script.cpp
@@ -0,0 +1,3 @@
+#include "Script.h"
+
+using namespace crepe::api;
diff --git a/src/crepe/api/Script.h b/src/crepe/api/Script.h
new file mode 100644
index 0000000..0036d1f
--- /dev/null
+++ b/src/crepe/api/Script.h
@@ -0,0 +1,21 @@
+#pragma once
+
+namespace crepe {
+class ScriptSystem;
+}
+
+namespace crepe::api {
+
+class Script {
+	friend class crepe::ScriptSystem;
+
+protected:
+	virtual void init() {}
+	virtual void update() {}
+	// NOTE: additional *events* (like unity's OnDisable and OnEnable) should be
+	// implemented as member methods in derivative user script classes and
+	// registered in init(), otherwise this class will balloon in size with each
+	// added event.
+};
+
+} // namespace crepe::api
diff --git a/src/crepe/api/Sprite.cpp b/src/crepe/api/Sprite.cpp
new file mode 100644
index 0000000..aa7dbb0
--- /dev/null
+++ b/src/crepe/api/Sprite.cpp
@@ -0,0 +1,8 @@
+#include <string>
+
+#include "Sprite.h"
+
+using namespace crepe::api;
+using namespace std;
+
+Sprite::Sprite(string path) : path(path) {}
diff --git a/src/crepe/api/Sprite.h b/src/crepe/api/Sprite.h
new file mode 100644
index 0000000..580f825
--- /dev/null
+++ b/src/crepe/api/Sprite.h
@@ -0,0 +1,16 @@
+#pragma once
+
+#include <string>
+
+#include "../Component.h"
+
+namespace crepe::api {
+
+class Sprite : public Component {
+public:
+	Sprite(std::string path);
+
+	std::string path;
+};
+
+} // namespace crepe::api
diff --git a/src/crepe/main.cpp b/src/crepe/main.cpp
deleted file mode 100644
index 8e9a184..0000000
--- a/src/crepe/main.cpp
+++ /dev/null
@@ -1,3 +0,0 @@
-#include <stdio.h>
-
-int main() { printf("Hello World!\n"); }
diff --git a/src/crepe/util/CMakeLists.txt b/src/crepe/util/CMakeLists.txt
new file mode 100644
index 0000000..e2cffaf
--- /dev/null
+++ b/src/crepe/util/CMakeLists.txt
@@ -0,0 +1,11 @@
+target_sources(crepe PUBLIC
+	log.cpp
+	fmt.cpp
+)
+
+target_sources(crepe PUBLIC FILE_SET HEADERS FILES
+	color.h
+	log.h
+	fmt.h
+)
+
diff --git a/src/crepe/util/color.h b/src/crepe/util/color.h
new file mode 100644
index 0000000..066c9d3
--- /dev/null
+++ b/src/crepe/util/color.h
@@ -0,0 +1,41 @@
+#pragma once
+
+namespace crepe::util::color {
+
+constexpr const char * RESET = "\e[0m";
+
+constexpr const char * FG_BLACK = "\e[30m";
+constexpr const char * FG_RED = "\e[31m";
+constexpr const char * FG_GREEN = "\e[32m";
+constexpr const char * FG_YELLOW = "\e[33m";
+constexpr const char * FG_BLUE = "\e[34m";
+constexpr const char * FG_MAGENTA = "\e[35m";
+constexpr const char * FG_CYAN = "\e[36m";
+constexpr const char * FG_WHITE = "\e[37m";
+constexpr const char * BG_BLACK = "\e[40m";
+constexpr const char * BG_RED = "\e[41m";
+constexpr const char * BG_GREEN = "\e[42m";
+constexpr const char * BG_YELLOW = "\e[43m";
+constexpr const char * BG_BLUE = "\e[44m";
+constexpr const char * BG_MAGENTA = "\e[45m";
+constexpr const char * BG_CYAN = "\e[46m";
+constexpr const char * BG_WHITE = "\e[47m";
+
+constexpr const char * FG_BLACK_BRIGHT = "\e[90m";
+constexpr const char * FG_RED_BRIGHT = "\e[91m";
+constexpr const char * FG_GREEN_BRIGHT = "\e[92m";
+constexpr const char * FG_YELLOW_BRIGHT = "\e[93m";
+constexpr const char * FG_BLUE_BRIGHT = "\e[94m";
+constexpr const char * FG_MAGENTA_BRIGHT = "\e[95m";
+constexpr const char * FG_CYAN_BRIGHT = "\e[96m";
+constexpr const char * FG_WHITE_BRIGHT = "\e[97m";
+constexpr const char * BG_BLACK_BRIGHT = "\e[100m";
+constexpr const char * BG_RED_BRIGHT = "\e[101m";
+constexpr const char * BG_GREEN_BRIGHT = "\e[102m";
+constexpr const char * BG_YELLOW_BRIGHT = "\e[103m";
+constexpr const char * BG_BLUE_BRIGHT = "\e[104m";
+constexpr const char * BG_MAGENTA_BRIGHT = "\e[105m";
+constexpr const char * BG_CYAN_BRIGHT = "\e[106m";
+constexpr const char * BG_WHITE_BRIGHT = "\e[107m";
+
+} // namespace crepe::util::color
diff --git a/src/crepe/util/fmt.cpp b/src/crepe/util/fmt.cpp
new file mode 100644
index 0000000..8ef1164
--- /dev/null
+++ b/src/crepe/util/fmt.cpp
@@ -0,0 +1,33 @@
+#include <cstdarg>
+#include <cstdio>
+#include <string>
+
+#include "fmt.h"
+
+using namespace std;
+
+string crepe::util::va_stringf(va_list args, const char * fmt) {
+	va_list args_copy;
+	va_copy(args_copy, args);
+
+	size_t sz = vsnprintf(NULL, 0, fmt, args_copy) + 1;
+	char * msg = (char *) malloc(sz);
+	va_end(args_copy);
+
+	vsnprintf(msg, sz, fmt, args);
+
+	string out = msg;
+	free(msg);
+
+	va_end(args);
+
+	return out;
+}
+
+string crepe::util::stringf(const char * fmt, ...) {
+	va_list args;
+	va_start(args, fmt);
+	string out = va_stringf(args, fmt);
+	va_end(args);
+	return out;
+}
diff --git a/src/crepe/util/fmt.h b/src/crepe/util/fmt.h
new file mode 100644
index 0000000..44c426f
--- /dev/null
+++ b/src/crepe/util/fmt.h
@@ -0,0 +1,10 @@
+#pragma once
+
+#include <string>
+
+namespace crepe::util {
+
+std::string va_stringf(va_list args, const char * fmt);
+std::string stringf(const char * fmt, ...);
+
+} // namespace crepe::util
diff --git a/src/crepe/util/log.cpp b/src/crepe/util/log.cpp
new file mode 100644
index 0000000..0c2ce1e
--- /dev/null
+++ b/src/crepe/util/log.cpp
@@ -0,0 +1,40 @@
+#include <cstdarg>
+#include <cstdio>
+#include <cstdlib>
+#include <string>
+
+#include "fmt.h"
+#include "log.h"
+
+using namespace crepe::util;
+
+static const char * const LOG_PREFIX[] = {
+	[log_level::DEBUG] = "[DBG] ",
+	[log_level::INFO] = "[INFO] ",
+	[log_level::WARNING] = "[WARN] ",
+	[log_level::ERROR] = "[ERR] ",
+};
+
+static void log(enum log_level level, const std::string & msg) {
+	using namespace std;
+	string out = string(LOG_PREFIX[level]) + msg;
+	if (!out.ends_with("\n")) out += "\n";
+
+	// TODO: also log to file or smth
+	printf("%s", out.c_str());
+	fflush(stdout);
+}
+
+void crepe::util::logf(const char * fmt, ...) {
+	va_list args;
+	va_start(args, fmt);
+	log(log_level::DEBUG, va_stringf(args, fmt));
+	va_end(args);
+}
+
+void crepe::util::logf(log_level level, const char * fmt, ...) {
+	va_list args;
+	va_start(args, fmt);
+	log(level, va_stringf(args, fmt));
+	va_end(args);
+}
diff --git a/src/crepe/util/log.h b/src/crepe/util/log.h
new file mode 100644
index 0000000..3e36f0a
--- /dev/null
+++ b/src/crepe/util/log.h
@@ -0,0 +1,36 @@
+#pragma once
+
+// allow user to disable debug macros
+#ifndef CREPE_DISABLE_MACROS
+
+#include "color.h"
+
+// utility macros
+#define _crepe_logf_here(fmt, ...) \
+	crepe::util::logf(util::log_level::DEBUG, "%s%s (%s:%d)%s" fmt "\n", \
+					  crepe::util::color::FG_WHITE, __PRETTY_FUNCTION__, \
+					  __FILE_NAME__, __LINE__, crepe::util::color::RESET, \
+					  __VA_ARGS__)
+
+// very illegal global function-style macros
+// NOLINTBEGIN
+#define dbg_logf(fmt, ...) _crepe_logf_here(": " fmt, __VA_ARGS__)
+#define dbg_log(str) _crepe_logf_here("%s: " str, "")
+#define dbg_trace() _crepe_logf_here("%s", "")
+// NOLINTEND
+
+#endif
+
+namespace crepe::util {
+
+enum log_level {
+	DEBUG,
+	INFO,
+	WARNING,
+	ERROR,
+};
+
+void logf(const char * fmt, ...);
+void logf(enum log_level level, const char * fmt, ...);
+
+} // namespace crepe::util
diff --git a/src/example/CMakeLists.txt b/src/example/CMakeLists.txt
new file mode 100644
index 0000000..53f584f
--- /dev/null
+++ b/src/example/CMakeLists.txt
@@ -0,0 +1,22 @@
+# all examples
+add_custom_target(examples)
+
+# add_example(target_name [SOURCES...])
+function(add_example target_name)
+	# if SOURCES is not specified
+	if(NOT ARGV1)
+		# A .cpp file with target_name exists, and should be used
+		set(sources ${target_name}.cpp)
+	else()
+		set(sources ${ARGV})
+	endif()
+
+	add_executable(${target_name} EXCLUDE_FROM_ALL ${sources})
+	target_link_libraries(${target_name} PUBLIC crepe)
+	add_dependencies(examples ${target_name})
+endfunction()
+
+add_example(audio_internal)
+add_example(components_internal)
+add_example(script)
+
diff --git a/src/example/audio_internal.cpp b/src/example/audio_internal.cpp
new file mode 100644
index 0000000..1199e2d
--- /dev/null
+++ b/src/example/audio_internal.cpp
@@ -0,0 +1,45 @@
+/** \file
+ * 
+ * Standalone example for usage of the internal \c Sound class.
+ */
+
+#include <crepe/Sound.h>
+#include <crepe/util/log.h>
+
+#include <chrono>
+#include <thread>
+
+using namespace crepe;
+using namespace std;
+using namespace std::chrono_literals;
+using std::make_unique;
+
+int main() {
+	dbg_trace();
+
+	auto bgm = Sound("../mwe/audio/bgm.ogg");
+	auto sfx1 = Sound("../mwe/audio/sfx1.wav");
+	auto sfx2 = Sound("../mwe/audio/sfx2.wav");
+	auto sfx3 = Sound("../mwe/audio/sfx3.wav");
+
+	bgm.play();
+
+	// play each sample sequentially
+	this_thread::sleep_for(500ms);
+	sfx1.play();
+	this_thread::sleep_for(500ms);
+	sfx2.play();
+	bgm.pause();
+	this_thread::sleep_for(500ms);
+	sfx3.play();
+	bgm.play();
+	this_thread::sleep_for(500ms);
+
+	// play all samples simultaniously
+	sfx1.play();
+	sfx2.play();
+	sfx3.play();
+	this_thread::sleep_for(1000ms);
+
+	return 0;
+}
diff --git a/src/example/components_internal.cpp b/src/example/components_internal.cpp
new file mode 100644
index 0000000..e2169e1
--- /dev/null
+++ b/src/example/components_internal.cpp
@@ -0,0 +1,63 @@
+/** \file
+ * 
+ * Standalone example for usage of the internal ECS
+ */
+
+#include <cassert>
+#include <chrono>
+
+#include <crepe/Component.h>
+#include <crepe/ComponentManager.h>
+
+#include <crepe/api/Collider.h>
+#include <crepe/api/GameObject.h>
+#include <crepe/api/Rigidbody.h>
+#include <crepe/api/Sprite.h>
+
+#include <crepe/util/log.h>
+
+using namespace crepe::api;
+using namespace crepe;
+using namespace std;
+
+#define OBJ_COUNT 100000
+
+int main() {
+	dbg_trace();
+
+	auto & mgr = ComponentManager::get_instance();
+
+	auto start_adding = chrono::high_resolution_clock::now();
+
+	GameObject * game_object[OBJ_COUNT];
+
+	for (int i = 0; i < OBJ_COUNT; ++i) {
+		game_object[i] = new GameObject(i, "Name", "Tag", 0);
+
+		game_object[i]->add_component<Sprite>("test");
+		game_object[i]->add_component<Rigidbody>(0, 0, i);
+		game_object[i]->add_component<Collider>(i);
+	}
+
+	auto stop_adding = chrono::high_resolution_clock::now();
+
+	auto sprites = mgr.get_components_by_type<Sprite>();
+	for (auto sprite : sprites) {
+		assert(sprite.get().path == "test");
+	}
+
+	auto stop_looping = chrono::high_resolution_clock::now();
+
+	for (int i = 0; i < OBJ_COUNT; ++i) {
+		delete game_object[i];
+	}
+
+	auto add_time = chrono::duration_cast<chrono::microseconds>(stop_adding
+																- start_adding);
+	auto loop_time = chrono::duration_cast<chrono::microseconds>(stop_looping
+																 - stop_adding);
+	printf("add time:  %ldus\n", add_time.count());
+	printf("loop time: %ldus\n", loop_time.count());
+
+	return 0;
+}
diff --git a/src/example/script.cpp b/src/example/script.cpp
new file mode 100644
index 0000000..6e5563c
--- /dev/null
+++ b/src/example/script.cpp
@@ -0,0 +1,32 @@
+/** \file
+ * 
+ * Standalone example for usage of the script component and system
+ */
+
+#include <crepe/ComponentManager.h>
+#include <crepe/ScriptSystem.h>
+#include <crepe/util/log.h>
+
+#include <crepe/api/BehaviorScript.h>
+#include <crepe/api/GameObject.h>
+#include <crepe/api/Script.h>
+
+using namespace crepe;
+using namespace crepe::api;
+using namespace std;
+
+class MyScript : public Script {
+	void update() { dbg_log("MY SCRIPT UPDATE"); }
+};
+
+int main() {
+	dbg_trace();
+
+	auto obj = GameObject(0, "name", "tag", 0);
+	obj.add_component<BehaviorScript>().set_script<MyScript>();
+
+	auto & sys = ScriptSystem::get_instance();
+	sys.update(); // -> MyScript::update
+
+	return 0;
+}
diff --git a/src/makefile b/src/makefile
new file mode 100644
index 0000000..c1ef601
--- /dev/null
+++ b/src/makefile
@@ -0,0 +1,6 @@
+.PHONY: FORCE
+
+FMT += $(shell git ls-files '*.c' '*.cpp' '*.h' '*.hpp')
+format: FORCE
+	clang-tidy -p build/compile_commands.json --fix-errors $(FMT)
+
diff --git a/src/readme.md b/src/readme.md
new file mode 100644
index 0000000..a8ffc51
--- /dev/null
+++ b/src/readme.md
@@ -0,0 +1,34 @@
+# engine source
+
+This folder contains the crêpe engine source files, unit tests, and some toy
+examples. The only target built by default by the CMakeLists.txt in this folder
+is the crêpe shared library object.
+
+Examples (using Ninja):
+
+```
+$ cmake -B build -G Ninja
+$ ninja -C build
+```
+
+Unit tests can be built by explicitly specifying the target `test_main` when
+running the build command:
+
+```
+$ ninja -C build test_main
+```
+
+Each source file in the example/ folder corresponds to a CMake target as well
+(all examples can be built at once by specifying the `examples` target):
+
+```
+$ ninja -C build audio_internal components_internal
+```
+
+For installing crêpe system-wide after building (install must be run with
+elevated privileges):
+
+```
+# ninja -C build install
+```
+
diff --git a/src/test/CMakeLists.txt b/src/test/CMakeLists.txt
new file mode 100644
index 0000000..0d316d6
--- /dev/null
+++ b/src/test/CMakeLists.txt
@@ -0,0 +1,5 @@
+target_sources(test_main PUBLIC
+	dummy.cpp
+	# audio.cpp
+)
+
diff --git a/src/test/audio.cpp b/src/test/audio.cpp
new file mode 100644
index 0000000..d6ff689
--- /dev/null
+++ b/src/test/audio.cpp
@@ -0,0 +1,10 @@
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace std::chrono_literals;
+
+// using namespace crepe;
+
+// TODO: mock internal audio class
+
+TEST(audio, play) { ASSERT_TRUE(true); }
diff --git a/test/dummy.cpp b/src/test/dummy.cpp
index a00a9c6..a00a9c6 100644
--- a/test/dummy.cpp
+++ b/src/test/dummy.cpp
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
deleted file mode 100644
index 26aa460..0000000
--- a/test/CMakeLists.txt
+++ /dev/null
@@ -1,21 +0,0 @@
-cmake_minimum_required(VERSION 3.28)
-
-set(CMAKE_C_STANDARD 11)
-set(CMAKE_CXX_STANDARD 20)
-set(CMAKE_EXPORT_COMPILE_COMMANDS 1)
-
-set(CMAKE_BUILD_TYPE Debug)
-
-project(test C CXX)
-
-add_subdirectory(../lib/googletest googletest)
-
-add_executable(test
-	dummy.cpp
-)
-
-target_link_libraries(test
-	gtest_main
-	# TODO: add crepe engine
-)
-