crown-engine/engine/SceneGraph.h

/*
Copyright (c) 2013 Daniele Bartolini, Michele Rossi
Copyright (c) 2012 Daniele Bartolini, Simone Boscaratto

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 "Types.h"
#include "Mat4.h"
#include "List.h"
#include "IdTable.h"
#include "HeapAllocator.h"

namespace crown
{

#define MAX_NODES 1024
typedef Id NodeId;

class SceneGraph
{
public:

					SceneGraph();

	NodeId			create_node(const Vec3& pos, const Quat& rot);
	void			destroy_node(NodeId id);

	void			link(NodeId child, NodeId parent);
	void			unlink(NodeId child);

	void			set_local_position(NodeId node, const Vec3& pos);
	void			set_local_rotation(NodeId node, const Quat& rot);
	void			set_local_pose(NodeId node, const Mat4& pose);

	Vec3			local_position(NodeId node) const;
	Quat			local_rotation(NodeId node) const;
	Mat4			local_pose(NodeId node) const;

	Vec3			world_position(NodeId node) const;
	Quat			world_rotation(NodeId node) const;
	Mat4			world_pose(NodeId node) const;

	void			update();

private:

	HeapAllocator	m_allocator;

	// Sparse table of nodes
	IdTable<MAX_NODES> m_nodes;

	// Conversion from sparse table to packed array
	uint32_t		m_sparse_to_packed[MAX_NODES];

	// Packed arrays of transforms
	List<Mat4>		m_world_poses;
	List<Mat4>		m_local_poses;
	List<int32_t>	m_parents;
};

} // namespace crown