copy homemade ECS to crepe + correct code style

9 files changed, 320 insertions, 0 deletions

diff --git a/src/crepe/CMakeLists.txt b/src/crepe/CMakeLists.txt
index 208ba1f..5840208 100644
--- a/src/crepe/CMakeLists.txt
+++ b/src/crepe/CMakeLists.txt
@@ -2,12 +2,20 @@ target_sources(crepe PUBLIC
 	Asset.cpp
 	Sound.cpp
 	SoundContext.cpp
+	ComponentManager.cpp
+	Components.cpp
+	GameObject.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	Asset.h
 	Sound.h
 	SoundContext.h
+	ComponentManager.h
+	ComponentManager.hpp
+	Components.h
+	GameObject.h
+	GameObject.hpp
 )
 
 add_subdirectory(api)
diff --git a/src/crepe/ComponentManager.cpp b/src/crepe/ComponentManager.cpp
new file mode 100644
index 0000000..b7a1bea
--- /dev/null
+++ b/src/crepe/ComponentManager.cpp
@@ -0,0 +1,25 @@
+#include "ComponentManager.h"
+
+using namespace crepe;
+
+ComponentManager & ComponentManager::get_instance() {
+	static ComponentManager instance;
+	return instance;
+}
+
+void ComponentManager::DeleteAllComponentsOfId(std::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::DeleteAllComponents() {
+	// Clear the whole unordered_map<>
+	components.clear();
+}
+
diff --git a/src/crepe/ComponentManager.h b/src/crepe/ComponentManager.h
new file mode 100644
index 0000000..003cd0b
--- /dev/null
+++ b/src/crepe/ComponentManager.h
@@ -0,0 +1,55 @@
+#pragma once
+
+#include <cstdint>
+#include <memory>
+#include <typeindex>
+#include <unordered_map>
+#include <utility>
+#include <vector>
+
+#include "Components.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> void 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:
+	ComponentManager() = default;
+
+	/*
+	 * 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;
+};
+
+}
+
+// #include "ComponentManager.hpp"
+
diff --git a/src/crepe/ComponentManager.hpp b/src/crepe/ComponentManager.hpp
new file mode 100644
index 0000000..602490e
--- /dev/null
+++ b/src/crepe/ComponentManager.hpp
@@ -0,0 +1,134 @@
+#pragma once
+
+#include "ComponentManager.h"
+
+namespace crepe {
+
+template <typename T, typename... Args>
+void 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 (components.find(type) == components.end()) {
+		//If not, create a new (empty) vector<> of vector<unique_ptr<Component>>
+		components[type] = std::vector<std::vector<std::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 using perfect forwarding and store its
+	// unique_ptr in the vector<>
+	components[type][id].push_back(std::make_unique<T>(std::forward<Args>(args)...));
+}
+
+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 (components.find(type) != components.end()) {
+		// Get the correct vector<>
+		std::vector<std::vector<std::unique_ptr<Component>>> & componentArray = components[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 (components.find(type) != components.end()) {
+		// Clear the whole vector<> of this specific type
+		components[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 (components.find(type) != components.end()) {
+		// Get the correct vector<>
+		const std::vector<std::vector<std::unique_ptr<Component>>> & componentArray = components.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;
+	// Set the id to 0 (the id will also be stored in the returned vector<>)
+	// std::uint32_t id = 0;
+
+	// Find the type (in the unordered_map<>)
+	if (components.find(type) != components.end()) {
+
+		// Get the correct vector<>
+		const std::vector<std::vector<std::unique_ptr<Component>>> & componentArray = components.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));
+				}
+			}
+
+			// Increase the id (the id will also be stored in the returned vector<>)
+			//++id;
+		}
+	}
+
+	// Return the vector<>
+	return componentVector;
+}
+
+}
+
diff --git a/src/crepe/Components.cpp b/src/crepe/Components.cpp
new file mode 100644
index 0000000..9760daa
--- /dev/null
+++ b/src/crepe/Components.cpp
@@ -0,0 +1,13 @@
+#include "Components.h"
+#include <iostream>
+
+using namespace crepe;
+
+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/src/crepe/Components.h b/src/crepe/Components.h
new file mode 100644
index 0000000..7cb6fbb
--- /dev/null
+++ b/src/crepe/Components.h
@@ -0,0 +1,39 @@
+#pragma once
+
+#include <string>
+
+namespace crepe {
+
+class Component {
+public:
+	Component();
+
+	bool mActive;
+};
+
+// TODO: these should be in separate files
+
+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/src/crepe/GameObject.cpp b/src/crepe/GameObject.cpp
new file mode 100644
index 0000000..5ac9d7a
--- /dev/null
+++ b/src/crepe/GameObject.cpp
@@ -0,0 +1,9 @@
+#include "GameObject.h"
+
+#include "ComponentManager.h"
+
+using namespace crepe;
+
+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/src/crepe/GameObject.h b/src/crepe/GameObject.h
new file mode 100644
index 0000000..71ef60d
--- /dev/null
+++ b/src/crepe/GameObject.h
@@ -0,0 +1,22 @@
+#pragma once
+
+#include <cstdint>
+#include <string>
+
+namespace crepe {
+
+class GameObject {
+public:
+	GameObject(std::uint32_t id, std::string name, std::string tag, int layer);
+
+	template <typename T, typename... Args> void AddComponent(Args &&... args);
+
+	std::uint32_t mId;
+	std::string mName;
+	std::string mTag;
+	bool mActive;
+	int mLayer;
+};
+
+}
+
diff --git a/src/crepe/GameObject.hpp b/src/crepe/GameObject.hpp
new file mode 100644
index 0000000..5a672cf
--- /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>
+void GameObject::AddComponent(Args &&... args) {
+	ComponentManager::get_instance().AddComponent<T>(mId, std::forward<Args>(args)...);
+}
+
+}
+