path: root/src/mapblock_mesh.cpp

/*
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 "mapblock_mesh.h"
#include "light.h"
#include "mapblock.h"
#include "map.h"
#include "profiler.h"
#include "nodedef.h"
#include "gamedef.h"
#include "mesh.h"
#include "content_mapblock.h"
#include "noise.h"
#include "shader.h"
#include "settings.h"
#include "util/directiontables.h"

static void applyFacesShading(video::SColor& color, float factor)
{
	color.setRed(core::clamp(core::round32(color.getRed()*factor), 0, 255));
	color.setGreen(core::clamp(core::round32(color.getGreen()*factor), 0, 255));
}

/*
	MeshMakeData
*/

MeshMakeData::MeshMakeData(IGameDef *gamedef, bool use_shaders):
	m_vmanip(),
	m_blockpos(-1337,-1337,-1337),
	m_crack_pos_relative(-1337, -1337, -1337),
	m_highlighted_pos_relative(-1337, -1337, -1337),
	m_smooth_lighting(false),
	m_show_hud(false),
	m_highlight_mesh_color(255, 255, 255, 255),
	m_gamedef(gamedef),
	m_use_shaders(use_shaders)
{}

void MeshMakeData::fill(MapBlock *block)
{
	m_blockpos = block->getPos();

	v3s16 blockpos_nodes = m_blockpos*MAP_BLOCKSIZE;

	/*
		Copy data
	*/

	// Allocate this block + neighbors
	m_vmanip.clear();
	VoxelArea voxel_area(blockpos_nodes - v3s16(1,1,1) * MAP_BLOCKSIZE,
			blockpos_nodes + v3s16(1,1,1) * MAP_BLOCKSIZE*2-v3s16(1,1,1));
	m_vmanip.addArea(voxel_area);

	{
		//TimeTaker timer("copy central block data");
		// 0ms

		// Copy our data
		block->copyTo(m_vmanip);
	}
	{
		//TimeTaker timer("copy neighbor block data");
		// 0ms

		/*
			Copy neighbors. This is lightning fast.
			Copying only the borders would be *very* slow.
		*/

		// Get map
		Map *map = block->getParent();

		for(u16 i=0; i<26; i++)
		{
			const v3s16 &dir = g_26dirs[i];
			v3s16 bp = m_blockpos + dir;
			MapBlock *b = map->getBlockNoCreateNoEx(bp);
			if(b)
				b->copyTo(m_vmanip);
		}
	}
}

void MeshMakeData::fillSingleNode(MapNode *node)
{
	m_blockpos = v3s16(0,0,0);

	v3s16 blockpos_nodes = v3s16(0,0,0);
	VoxelArea area(blockpos_nodes-v3s16(1,1,1)*MAP_BLOCKSIZE,
			blockpos_nodes+v3s16(1,1,1)*MAP_BLOCKSIZE*2-v3s16(1,1,1));
	s32 volume = area.getVolume();
	s32 our_node_index = area.index(1,1,1);

	// Allocate this block + neighbors
	m_vmanip.clear();
	m_vmanip.addArea(area);

	// Fill in data
	MapNode *data = new MapNode[volume];
	for(s32 i = 0; i < volume; i++)
	{
		if(i == our_node_index)
		{
			data[i] = *node;
		}
		else
		{
			data[i] = MapNode(CONTENT_AIR, LIGHT_MAX, 0);
		}
	}
	m_vmanip.copyFrom(data, area, area.MinEdge, area.MinEdge, area.getExtent());
	delete[] data;
}

void MeshMakeData::setCrack(int crack_level, v3s16 crack_pos)
{
	if(crack_level >= 0)
		m_crack_pos_relative = crack_pos - m_blockpos*MAP_BLOCKSIZE;
}

void MeshMakeData::setHighlighted(v3s16 highlighted_pos, bool show_hud)
{
	m_show_hud = show_hud;
	m_highlighted_pos_relative = highlighted_pos - m_blockpos*MAP_BLOCKSIZE;
}

void MeshMakeData::setSmoothLighting(bool smooth_lighting)
{
	m_smooth_lighting = smooth_lighting;
}

/*
	Light and vertex color functions
*/

/*
	Calculate non-smooth lighting at interior of node.
	Single light bank.
*/
static u8 getInteriorLight(enum LightBank bank, MapNode n, s32 increment,
		INodeDefManager *ndef)
{
	u8 light = n.getLight(bank, ndef);

	while(increment > 0)
	{
		light = undiminish_light(light);
		--increment;
	}
	while(increment < 0)
	{
		light = diminish_light(light);
		++increment;
	}

	return decode_light(light);
}

/*
	Calculate non-smooth lighting at interior of node.
	Both light banks.
*/