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framework/scene_graph/scene.h

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+/* Copyright (c) 2018-2020, Arm Limited and Contributors
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 the "License";
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <algorithm>
+#include <memory>
+#include <string>
+#include <typeindex>
+#include <unordered_map>
+#include <vector>
+
+#include "scene_graph/components/light.h"
+#include "scene_graph/components/texture.h"
+
+namespace vkb
+{
+namespace sg
+{
+class Node;
+class Component;
+class SubMesh;
+
+/// @brief A collection of nodes organized in a tree structure.
+///		   It can contain more than one root node.
+class Scene
+{
+  public:
+	Scene() = default;
+
+	Scene(const std::string &name);
+
+	void set_name(const std::string &name);
+
+	const std::string &get_name() const;
+
+	void set_nodes(std::vector<std::unique_ptr<Node>> &&nodes);
+
+	void add_node(std::unique_ptr<Node> &&node);
+
+	void add_child(Node &child);
+
+	std::unique_ptr<Component> get_model(uint32_t index = 0);
+
+	void add_component(std::unique_ptr<Component> &&component);
+
+	void add_component(std::unique_ptr<Component> &&component, Node &node);
+
+	/**
+	 * @brief Set list of components for the given type
+	 * @param type_info The type of the component
+	 * @param components The list of components (retained)
+	 */
+	void set_components(const std::type_index &type_info, std::vector<std::unique_ptr<Component>> &&components);
+
+	/**
+	 * @brief Set list of components casted from the given template type
+	 */
+	template <class T>
+	void set_components(std::vector<std::unique_ptr<T>> &&components)
+	{
+		std::vector<std::unique_ptr<Component>> result(components.size());
+		std::transform(components.begin(), components.end(), result.begin(),
+		               [](std::unique_ptr<T> &component) -> std::unique_ptr<Component> {
+			               return std::unique_ptr<Component>(std::move(component));
+		               });
+		set_components(typeid(T), std::move(result));
+	}
+
+	/**
+	 * @brief Clears a list of components
+	 */
+	template <class T>
+	void clear_components()
+	{
+		set_components(typeid(T), {});
+	}
+
+	/**
+	 * @return List of pointers to components casted to the given template type
+	 */
+	template <class T>
+	std::vector<T *> get_components() const
+	{
+		std::vector<T *> result;
+		if (has_component(typeid(T)))
+		{
+			auto &scene_components = get_components(typeid(T));
+
+			result.resize(scene_components.size());
+			std::transform(scene_components.begin(), scene_components.end(), result.begin(),
+			               [](const std::unique_ptr<Component> &component) -> T * {
+				               return dynamic_cast<T *>(component.get());
+			               });
+		}
+
+		return result;
+	}
+
+	/**
+	 * @return List of components for the given type
+	 */
+	const std::vector<std::unique_ptr<Component>> &get_components(const std::type_index &type_info) const;
+
+	template <class T>
+	bool has_component() const
+	{
+		return has_component(typeid(T));
+	}
+
+	bool has_component(const std::type_index &type_info) const;
+
+	Node *find_node(const std::string &name);
+
+	void set_root_node(Node &node);
+
+	Node &get_root_node();
+
+  private:
+	std::string name;
+
+	/// List of all the nodes
+	std::vector<std::unique_ptr<Node>> nodes;
+
+	Node *root{nullptr};
+
+	std::unordered_map<std::type_index, std::vector<std::unique_ptr<Component>>> components;
+};
+}        // namespace sg
+}        // namespace vkb