Merge remote-tracking branch 'origin/master' into max/big-cleanup

7 files changed, 142 insertions, 2 deletions

diff --git a/src/crepe/ComponentManager.hpp b/src/crepe/ComponentManager.hpp
index e52b679..7616f92 100644
--- a/src/crepe/ComponentManager.hpp
+++ b/src/crepe/ComponentManager.hpp
@@ -88,7 +88,8 @@ ComponentManager::get_components_by_id(uint32_t id) const {
 	// Create an empty vector<>
 	vector<reference_wrapper<T>> component_vector;
 
-	if (this->components.find(type) == this->components.end()) return component_vector;
+	if (this->components.find(type) == this->components.end())
+		return component_vector;
 
 	// Get the correct vector<>
 	const vector<vector<unique_ptr<Component>>> & component_array
@@ -123,7 +124,8 @@ ComponentManager::get_components_by_type() const {
 	vector<reference_wrapper<T>> component_vector;
 
 	// Find the type (in the unordered_map<>)
-	if (this->components.find(type) == this->components.end()) return component_vector;
+	if (this->components.find(type) == this->components.end())
+		return component_vector;
 
 	// Get the correct vector<>
 	const vector<vector<unique_ptr<Component>>> & component_array
diff --git a/src/crepe/api/CMakeLists.txt b/src/crepe/api/CMakeLists.txt
index 3e0c044..dbd6bf1 100644
--- a/src/crepe/api/CMakeLists.txt
+++ b/src/crepe/api/CMakeLists.txt
@@ -12,6 +12,8 @@ target_sources(crepe PUBLIC
 	AssetManager.cpp
 	Sprite.cpp
 	Metadata.cpp
+	Scene.cpp
+	SceneManager.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -29,5 +31,8 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	Texture.h 
 	AssetManager.h 
 	AssetManager.hpp
+	Scene.h
 	Metadata.h
+	SceneManager.h
+	SceneManager.hpp
 )
diff --git a/src/crepe/api/Scene.cpp b/src/crepe/api/Scene.cpp
new file mode 100644
index 0000000..933edf4
--- /dev/null
+++ b/src/crepe/api/Scene.cpp
@@ -0,0 +1,5 @@
+#include "Scene.h"
+
+using namespace crepe;
+
+Scene::Scene(const std::string & name) : name(name) {}
diff --git a/src/crepe/api/Scene.h b/src/crepe/api/Scene.h
new file mode 100644
index 0000000..f8bcc3d
--- /dev/null
+++ b/src/crepe/api/Scene.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include <string>
+
+namespace crepe {
+
+class Scene {
+public:
+	Scene(const std::string & name);
+	virtual ~Scene() = default;
+	virtual void load_scene() = 0;
+
+public:
+	std::string name;
+};
+
+} // namespace crepe
diff --git a/src/crepe/api/SceneManager.cpp b/src/crepe/api/SceneManager.cpp
new file mode 100644
index 0000000..57ec302
--- /dev/null
+++ b/src/crepe/api/SceneManager.cpp
@@ -0,0 +1,43 @@
+#include <algorithm>
+#include <memory>
+
+#include "../ComponentManager.h"
+
+#include "SceneManager.h"
+
+using namespace crepe;
+using namespace std;
+
+SceneManager & SceneManager::get_instance() {
+	static SceneManager instance;
+	return instance;
+}
+
+void SceneManager::set_next_scene(const string & name) {
+	next_scene = name;
+}
+
+void SceneManager::load_next_scene() {
+	// next scene not set
+	if (this->next_scene.empty())
+		return;
+
+	auto it = find_if(this->scenes.begin(), this->scenes.end(),
+		[&next_scene = this->next_scene] (unique_ptr<Scene> & scene) {
+			return scene->name == next_scene;
+		}
+	);
+
+	// next scene not found
+	if (it == this->scenes.end())
+		return;
+	unique_ptr<Scene> & scene = *it;
+
+	// Delete all components of the current scene
+	ComponentManager & mgr = ComponentManager::get_instance();
+	mgr.delete_all_components();
+
+	// Load the new scene
+	scene->load_scene();
+}
+
diff --git a/src/crepe/api/SceneManager.h b/src/crepe/api/SceneManager.h
new file mode 100644
index 0000000..1e0e670
--- /dev/null
+++ b/src/crepe/api/SceneManager.h
@@ -0,0 +1,50 @@
+#pragma once
+
+#include <memory>
+#include <queue>
+#include <vector>
+
+#include "Scene.h"
+
+namespace crepe {
+
+class SceneManager {
+public:
+	// Singleton
+	static SceneManager & get_instance();
+	SceneManager(const SceneManager &) = delete;
+	SceneManager(SceneManager &&) = delete;
+	SceneManager & operator=(const SceneManager &) = delete;
+	SceneManager & operator=(SceneManager &&) = delete;
+
+public:
+	/**
+	 * \brief Add a new concrete scene to the scene manager
+	 *
+	 * \tparam T  Type of concrete scene
+	 * \param name  Name of new scene
+	 */
+	template <typename T>
+	void add_scene(const std::string & name);
+	/**
+	 * \brief Set the next scene
+	 *
+	 * This scene will be loaded at the end of the frame
+	 *
+	 * \param name  Name of the next scene
+	 */
+	void set_next_scene(const std::string & name);
+	//! Load a new scene (if there is one)
+	void load_next_scene();
+
+private:
+	SceneManager() = default;
+
+private:
+	std::vector<std::unique_ptr<Scene>> scenes;
+	std::string next_scene;
+};
+
+} // namespace crepe
+
+#include "SceneManager.hpp"
diff --git a/src/crepe/api/SceneManager.hpp b/src/crepe/api/SceneManager.hpp
new file mode 100644
index 0000000..8bad7b2
--- /dev/null
+++ b/src/crepe/api/SceneManager.hpp
@@ -0,0 +1,18 @@
+#include "SceneManager.h"
+
+namespace crepe {
+
+template <typename T>
+void SceneManager::add_scene(const std::string & name) {
+	static_assert(std::is_base_of<Scene, T>::value,
+				  "T must be derived from Scene");
+
+	scenes.emplace_back(make_unique<T>(name));
+
+	// The first scene added, is the one that will be loaded at the beginning
+	if (next_scene.empty()) {
+		next_scene = name;
+	}
+}
+
+} // namespace crepe