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/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef VOXELALGORITHMS_HEADER
#define VOXELALGORITHMS_HEADER
#include "voxel.h"
#include "mapnode.h"
#include <set>
#include <map>
class Map;
class MapBlock;
namespace voxalgo
{
// TODO: Move unspreadLight and spreadLight from VoxelManipulator to here
void setLight(VoxelManipulator &v, VoxelArea a, u8 light,
INodeDefManager *ndef);
void clearLightAndCollectSources(VoxelManipulator &v, VoxelArea a,
enum LightBank bank, INodeDefManager *ndef,
std::set<v3s16> & light_sources,
std::map<v3s16, u8> & unlight_from);
struct SunlightPropagateResult
{
bool bottom_sunlight_valid;
SunlightPropagateResult(bool bottom_sunlight_valid_):
bottom_sunlight_valid(bottom_sunlight_valid_)
{}
};
SunlightPropagateResult propagateSunlight(VoxelManipulator &v, VoxelArea a,
bool inexistent_top_provides_sunlight,
std::set<v3s16> & light_sources,
INodeDefManager *ndef);
/*!
* Updates the lighting on the map.
* The result will be correct only if
* no nodes were changed except the given ones.
* Before calling this procedure make sure that all new nodes on
* the map have zero light level!
*
* \param oldnodes contains the MapNodes that were replaced by the new
* MapNodes and their positions
* \param modified_blocks output, contains all map blocks that
* the function modified
*/
void update_lighting_nodes(
Map *map,
INodeDefManager *ndef,
std::vector<std::pair<v3s16, MapNode> > &oldnodes,
std::map<v3s16, MapBlock*> &modified_blocks);
/*!
* This class iterates trough voxels that intersect with
* a line. The collision detection does not see nodeboxes,
* every voxel is a cube and is returned.
* This iterator steps to all nodes exactly once.
*/
struct VoxelLineIterator
{
public:
//! Starting position of the line in world coordinates.
v3f m_start_position;
//! Direction and length of the line in world coordinates.
v3f m_line_vector;
/*!
* Each component stores the next smallest positive number, by
* which multiplying the line's vector gives a vector that ends
* on the intersection of two nodes.
*/
v3f m_next_intersection_multi;
/*!
* Each component stores the smallest positive number, by which
* m_next_intersection_multi's components can be increased.
*/
v3f m_intersection_multi_inc;
/*!
* Direction of the line. Each component can be -1 or 1 (if a
* component of the line's vector is 0, then there will be 1).
*/
v3s16 m_step_directions;
//! Position of the current node.
v3s16 m_current_node_pos;
//! If true, the next node will intersect the line, too.
bool m_has_next;
/*!
* Creates a voxel line iterator with the given line.
* @param start_position starting point of the line
* in voxel coordinates
* @param line_vector length and direction of the
* line in voxel coordinates. start_position+line_vector
* is the end of the line
*/
VoxelLineIterator(const v3f &start_position,const v3f &line_vector);
/*!
* Steps to the next voxel.
* Updates m_current_node_pos and
* m_previous_node_pos.
* Note that it works even if hasNext() is false,
* continuing the line as a ray.
*/
void next();
/*!
* Returns true if the next voxel intersects the given line.
*/
inline bool hasNext() const { return m_has_next; }
};
} // namespace voxalgo
#endif
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