scene_loader.hpp

/* Copyright (c) 2017-2023 Hans-Kristian Arntzen
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#pragma once

#include "scene.hpp"
#include "gltf.hpp"
#include "animation_system.hpp"
#include <memory>
#include <string>

namespace Granite
{
class SceneLoader
{
public:
	SceneLoader();

	// Loads scene and sets the root node of the loaded scene.
	void load_scene(const std::string &path);

	// Loads scene and returns the root node.
	// You must insert the node manually into the scene as appropriate.
	NodeHandle load_scene_to_root_node(const std::string &path);

	Scene &get_scene()
	{
		return *scene;
	}

	std::unique_ptr<AnimationSystem> consume_animation_system();
	AnimationSystem &get_animation_system();

private:
	struct SubsceneData
	{
		std::unique_ptr<GLTF::Parser> parser;
		std::vector<AbstractRenderableHandle> meshes;
	};
	std::unordered_map<std::string, SubsceneData> subscenes;

	std::unique_ptr<Scene> scene;
	std::unique_ptr<AnimationSystem> animation_system;
	NodeHandle parse_scene_format(const std::string &path, const std::string &json);
	NodeHandle parse_gltf(const std::string &path);

	NodeHandle build_tree_for_subscene(const SubsceneData &subscene);
	void load_animation(const std::string &path, SceneFormats::Animation &animation);
};
}