mirror of
https://github.com/minetest/minetest.git
synced 2024-11-23 16:13:46 +01:00
158 lines
4.5 KiB
C++
158 lines
4.5 KiB
C++
/*
|
|
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.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "voxel.h"
|
|
#include "mapnode.h"
|
|
#include "util/container.h"
|
|
|
|
class Map;
|
|
class ServerMap;
|
|
class MapBlock;
|
|
class MMVManip;
|
|
|
|
namespace voxalgo
|
|
{
|
|
|
|
/*!
|
|
* 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,
|
|
std::vector<std::pair<v3s16, MapNode> > &oldnodes,
|
|
std::map<v3s16, MapBlock*> &modified_blocks);
|
|
|
|
/*!
|
|
* Updates borders of the given mapblock.
|
|
* Only updates if the block was marked with incomplete
|
|
* lighting and the neighbor is also loaded.
|
|
*
|
|
* \param block the block to update
|
|
* \param modified_blocks output, contains all map blocks that
|
|
* the function modified
|
|
*/
|
|
void update_block_border_lighting(Map *map, MapBlock *block,
|
|
std::map<v3s16, MapBlock*> &modified_blocks);
|
|
|
|
/*!
|
|
* Copies back nodes from a voxel manipulator
|
|
* to the map and updates lighting.
|
|
* For server use only.
|
|
*
|
|
* \param modified_blocks output, contains all map blocks that
|
|
* the function modified
|
|
*/
|
|
void blit_back_with_light(ServerMap *map, MMVManip *vm,
|
|
std::map<v3s16, MapBlock*> *modified_blocks);
|
|
|
|
/*!
|
|
* Corrects the light in a map block.
|
|
* For server use only.
|
|
*
|
|
* \param block the block to update
|
|
*/
|
|
void repair_block_light(ServerMap *map, MapBlock *block,
|
|
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 { 10000.0f, 10000.0f, 10000.0f };
|
|
/*!
|
|
* Each component stores the smallest positive number, by which
|
|
* m_next_intersection_multi's components can be increased.
|
|
*/
|
|
v3f m_intersection_multi_inc { 10000.0f, 10000.0f, 10000.0f };
|
|
/*!
|
|
* 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 { 1, 1, 1 };
|
|
//! Position of the current node.
|
|
v3s16 m_current_node_pos;
|
|
//! Index of the current node
|
|
s16 m_current_index = 0;
|
|
//! Position of the start node.
|
|
v3s16 m_start_node_pos;
|
|
//! Index of the last node
|
|
s16 m_last_index;
|
|
|
|
/*!
|
|
* 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_current_index < m_last_index;
|
|
}
|
|
|
|
/*!
|
|
* Returns how many times next() must be called until
|
|
* voxel==m_current_node_pos.
|
|
* If voxel does not intersect with the line,
|
|
* the result is undefined.
|
|
*/
|
|
s16 getIndex(v3s16 voxel);
|
|
};
|
|
|
|
} // namespace voxalgo
|