po/uk

/*
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.
*/

#include "voxelalgorithms.h"
#include "nodedef.h"

namespace voxalgo
{

void setLight(VoxelManipulator &v, VoxelArea a, u8 light,
		INodeDefManager *ndef)
{
	for(s32 x=a.MinEdge.X; x<=a.MaxEdge.X; x++)
	for(s32 z=a.MinEdge.Z; z<=a.MaxEdge.Z; z++)
	for(s32 y=a.MinEdge.Y; y<=a.MaxEdge.Y; y++)
	{
		v3s16 p(x,y,z);
		MapNode &n = v.getNodeRefUnsafe(p);
		n.setLight(LIGHTBANK_DAY, light, ndef);
		n.setLight(LIGHTBANK_NIGHT, light, ndef);
	}
}

void clearLightAndCollectSources(VoxelManipulator &v, VoxelArea a,
		enum LightBank bank, INodeDefManager *ndef,
		std::set<v3s16> & light_sources,
		std::map<v3s16, u8> & unlight_from)
{
	// The full area we shall touch
	VoxelArea required_a = a;
	required_a.pad(v3s16(0,0,0));
	// Make sure we have access to it
	v.addArea(a);

	for(s32 x=a.MinEdge.X; x<=a.MaxEdge.X; x++)
	for(s32 z=a.MinEdge.Z; z<=a.MaxEdge.Z; z++)
	for(s32 y=a.MinEdge.Y; y<=a.MaxEdge.Y; y++)
	{
		v3s16 p(x,y,z);
		MapNode &n = v.getNodeRefUnsafe(p);
		u8 oldlight = n.getLight(bank, ndef);
		n.setLight(bank, 0, ndef);

		// If node sources light, add to list
		u8 source = ndef->get(n).light_source;
		if(source != 0)
			light_sources.insert(p);

		// Collect borders for unlighting
		if((x==a.MinEdge.X || x == a.MaxEdge.X
		|| y==a.MinEdge.Y || y == a.MaxEdge.Y
		|| z==a.MinEdge.Z || z == a.MaxEdge.Z)
		&& oldlight != 0)
		{
			unlight_from[p] = oldlight;
		}
	}
}

SunlightPropagateResult propagateSunlight(VoxelManipulator &v, VoxelArea a,
		bool inexistent_top_provides_sunlight,
		std::set<v3s16> & light_sources,
		INodeDefManager *ndef)
{
	// Return values
	bool bottom_sunlight_valid = true;

	// The full area we shall touch extends one extra at top and bottom
	VoxelArea required_a = a;
	required_a.pad(v3s16(0,1,0));
	// Make sure we have access to it
	v.addArea(a);

	s16 max_y = a.MaxEdge.Y;
	s16 min_y = a.MinEdge.Y;

	for(s32 x=a.MinEdge.X; x<=a.MaxEdge.X; x++)
	for(s32 z=a.MinEdge.Z; z<=a.MaxEdge.Z; z++)
	{