minetest/src/voxel.cpp

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/*
Minetest-c55
Copyright (C) 2010 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 General Public License as published by
the Free Software Foundation; either version 2 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 General Public License for more details.
You should have received a copy of the GNU 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.
*/
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#include "voxel.h"
#include "map.h"
VoxelManipulator::VoxelManipulator():
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m_data(NULL),
m_flags(NULL)
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{
}
VoxelManipulator::~VoxelManipulator()
{
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clear();
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if(m_data)
delete[] m_data;
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if(m_flags)
delete[] m_flags;
}
void VoxelManipulator::clear()
{
// Reset area to volume=0
m_area = VoxelArea();
if(m_data)
delete[] m_data;
m_data = NULL;
if(m_flags)
delete[] m_flags;
m_flags = NULL;
}
void VoxelManipulator::print(std::ostream &o)
{
v3s16 em = m_area.getExtent();
v3s16 of = m_area.MinEdge;
o<<"size: "<<em.X<<"x"<<em.Y<<"x"<<em.Z
<<" offset: ("<<of.X<<","<<of.Y<<","<<of.Z<<")"<<std::endl;
for(s32 y=m_area.MaxEdge.Y; y>=m_area.MinEdge.Y; y--)
{
if(em.X >= 3 && em.Y >= 3)
{
if (y==m_area.MinEdge.Y+2) o<<"^ ";
else if(y==m_area.MinEdge.Y+1) o<<"| ";
else if(y==m_area.MinEdge.Y+0) o<<"y x-> ";
else o<<" ";
}
for(s32 z=m_area.MinEdge.Z; z<=m_area.MaxEdge.Z; z++)
{
for(s32 x=m_area.MinEdge.X; x<=m_area.MaxEdge.X; x++)
{
u8 f = m_flags[m_area.index(x,y,z)];
char c;
if(f & VOXELFLAG_NOT_LOADED)
c = 'N';
else if(f & VOXELFLAG_INEXISTENT)
c = 'I';
else
{
c = 'X';
u8 m = m_data[m_area.index(x,y,z)].d;
if(m <= 9)
c = m + '0';
}
o<<c;
}
o<<' ';
}
o<<std::endl;
}
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}
void VoxelManipulator::addArea(VoxelArea area)
{
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// Cancel if requested area has zero volume
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if(area.getExtent() == v3s16(0,0,0))
return;
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// Cancel if m_area already contains the requested area
if(m_area.contains(area))
return;
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// Calculate new area
VoxelArea new_area;
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// New area is the requested area if m_area has zero volume
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if(m_area.getExtent() == v3s16(0,0,0))
{
new_area = area;
}
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// Else add requested area to m_area
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else
{
new_area = m_area;
new_area.addArea(area);
}
s32 new_size = new_area.getVolume();
/*dstream<<"adding area ";
area.print(dstream);
dstream<<", old area ";
m_area.print(dstream);
dstream<<", new area ";
new_area.print(dstream);
dstream<<", new_size="<<new_size;
dstream<<std::endl;*/
// Allocate and clear new data
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MapNode *new_data = new MapNode[new_size];
u8 *new_flags = new u8[new_size];
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for(s32 i=0; i<new_size; i++)
{
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new_flags[i] = VOXELFLAG_NOT_LOADED;
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}
// Copy old data
for(s32 z=m_area.MinEdge.Z; z<=m_area.MaxEdge.Z; z++)
for(s32 y=m_area.MinEdge.Y; y<=m_area.MaxEdge.Y; y++)
for(s32 x=m_area.MinEdge.X; x<=m_area.MaxEdge.X; x++)
{
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// If loaded, copy data and flags
if((m_flags[m_area.index(x,y,z)] & VOXELFLAG_NOT_LOADED) == false)
{
new_data[new_area.index(x,y,z)] = m_data[m_area.index(x,y,z)];
new_flags[new_area.index(x,y,z)] = m_flags[m_area.index(x,y,z)];
}
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}
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// Replace area, data and flags
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m_area = new_area;
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MapNode *old_data = m_data;
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u8 *old_flags = m_flags;
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/*dstream<<"old_data="<<(int)old_data<<", new_data="<<(int)new_data
<<", old_flags="<<(int)m_flags<<", new_flags="<<(int)new_flags<<std::endl;*/
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m_data = new_data;
m_flags = new_flags;
if(old_data)
delete[] old_data;
if(old_flags)
delete[] old_flags;
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}
void VoxelManipulator::interpolate(VoxelArea area)
{
VoxelArea emerge_area = area;
emerge_area.MinEdge -= v3s16(1,1,1);
emerge_area.MaxEdge += v3s16(1,1,1);
emerge(emerge_area);
SharedBuffer<u8> buf(area.getVolume());
for(s32 z=area.MinEdge.Z; z<=area.MaxEdge.Z; z++)
for(s32 y=area.MinEdge.Y; y<=area.MaxEdge.Y; y++)
for(s32 x=area.MinEdge.X; x<=area.MaxEdge.X; x++)
{
v3s16 p(x,y,z);
v3s16 dirs[] = {
v3s16(1,1,0),
v3s16(1,0,1),
v3s16(1,-1,0),
v3s16(1,0,-1),
v3s16(-1,1,0),
v3s16(-1,0,1),
v3s16(-1,-1,0),
v3s16(-1,0,-1),
};
//const v3s16 *dirs = g_26dirs;
s16 total = 0;
s16 airness = 0;
u8 m = MATERIAL_IGNORE;
for(s16 i=0; i<8; i++)
//for(s16 i=0; i<26; i++)
{
v3s16 p2 = p + dirs[i];
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u8 f = m_flags[m_area.index(p2)];
assert(!(f & VOXELFLAG_NOT_LOADED));
if(f & VOXELFLAG_INEXISTENT)
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continue;
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MapNode &n = m_data[m_area.index(p2)];
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airness += (n.d == MATERIAL_AIR) ? 1 : -1;
total++;
if(m == MATERIAL_IGNORE && n.d != MATERIAL_AIR)
m = n.d;
}
// 1 if air, 0 if not
buf[area.index(p)] = airness > -total/2 ? MATERIAL_AIR : m;
//buf[area.index(p)] = airness > -total ? MATERIAL_AIR : m;
//buf[area.index(p)] = airness >= -7 ? MATERIAL_AIR : m;
}
for(s32 z=area.MinEdge.Z; z<=area.MaxEdge.Z; z++)
for(s32 y=area.MinEdge.Y; y<=area.MaxEdge.Y; y++)
for(s32 x=area.MinEdge.X; x<=area.MaxEdge.X; x++)
{
v3s16 p(x,y,z);
m_data[m_area.index(p)].d = buf[area.index(p)];
}
}
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void VoxelManipulator::flowWater(v3s16 removed_pos)
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{
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v3s16 dirs[6] = {
v3s16(0,1,0), // top
v3s16(-1,0,0), // left
v3s16(1,0,0), // right
v3s16(0,0,-1), // front
v3s16(0,0,1), // back
v3s16(0,-1,0), // bottom
};
v3s16 p;
// Load neighboring nodes
// TODO: A bigger area would be better
emerge(VoxelArea(removed_pos - v3s16(1,1,1), removed_pos + v3s16(1,1,1)));
s32 i;
for(i=0; i<6; i++)
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{
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p = removed_pos + dirs[i];
u8 f = m_flags[m_area.index(p)];
// Inexistent or checked nodes can't move
if(f & (VOXELFLAG_INEXISTENT | VOXELFLAG_CHECKED))
continue;
MapNode &n = m_data[m_area.index(p)];
// Only liquid nodes can move
if(material_liquid(n.d) == false)
continue;
// If block is at top, select it always
if(i == 0)
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{
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break;
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}
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// If block is at bottom, select it if it has enough pressure
if(i == 5)
{
if(n.pressure >= 3)
break;
continue;
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}
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// Else block is at some side. Select it if it has enough pressure
if(n.pressure >= 2)
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{
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break;
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}
}
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// If there is nothing to move, return
if(i==6)
return;
// Switch nodes at p and removed_pos
MapNode n = m_data[m_area.index(p)];
u8 f = m_flags[m_area.index(p)];
m_data[m_area.index(p)] = m_data[m_area.index(removed_pos)];
m_flags[m_area.index(p)] = m_flags[m_area.index(removed_pos)];
m_data[m_area.index(removed_pos)] = n;
m_flags[m_area.index(removed_pos)] = f;
// Mark p checked
m_flags[m_area.index(p)] |= VOXELFLAG_CHECKED;
// Update pressure
//TODO
// Flow water to the newly created empty position
flowWater(p);
// Try flowing water to empty positions around removed_pos.
// They are checked in reverse order compared to the previous loop.
for(i=5; i>=0; i--)
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{
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p = removed_pos + dirs[i];
u8 f = m_flags[m_area.index(p)];
// Water can't move to inexistent nodes
if(f & VOXELFLAG_INEXISTENT)
continue;
MapNode &n = m_data[m_area.index(p)];
// Water can only move to air
if(n.d != MATERIAL_AIR)
continue;
flowWater(p);
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}
}
/*
MapVoxelManipulator
*/
MapVoxelManipulator::MapVoxelManipulator(Map *map)
{
m_map = map;
}
void MapVoxelManipulator::emerge(VoxelArea a)
{
v3s16 size = a.getExtent();
addArea(a);
for(s16 z=0; z<size.Z; z++)
for(s16 y=0; y<size.Y; y++)
for(s16 x=0; x<size.X; x++)
{
v3s16 p(x,y,z);
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s32 i = m_area.index(a.MinEdge + p);
// Don't touch nodes that have already been loaded
if(!(m_flags[i] & VOXELFLAG_NOT_LOADED))
continue;
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try{
MapNode n = m_map->getNode(a.MinEdge + p);
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m_data[i] = n;
m_flags[i] = 0;
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}
catch(InvalidPositionException &e)
{
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m_flags[i] = VOXELFLAG_INEXISTENT;
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}
}
}
void MapVoxelManipulator::blitBack
(core::map<v3s16, MapBlock*> & modified_blocks)
{
/*
Initialize block cache
*/
v3s16 blockpos_last;
MapBlock *block = NULL;
bool block_checked_in_modified = false;
for(s32 z=m_area.MinEdge.Z; z<=m_area.MaxEdge.Z; z++)
for(s32 y=m_area.MinEdge.Y; y<=m_area.MaxEdge.Y; y++)
for(s32 x=m_area.MinEdge.X; x<=m_area.MaxEdge.X; x++)
{
v3s16 p(x,y,z);
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u8 f = m_flags[m_area.index(p)];
if(f & (VOXELFLAG_NOT_LOADED|VOXELFLAG_INEXISTENT))
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continue;
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MapNode &n = m_data[m_area.index(p)];
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v3s16 blockpos = getNodeBlockPos(p);
try
{
// Get block
if(block == NULL || blockpos != blockpos_last){
block = m_map->getBlockNoCreate(blockpos);
blockpos_last = blockpos;
block_checked_in_modified = false;
}
// Calculate relative position in block
v3s16 relpos = p - blockpos * MAP_BLOCKSIZE;
// Don't continue if nothing has changed here
if(block->getNode(relpos) == n)
continue;
//m_map->setNode(m_area.MinEdge + p, n);
block->setNode(relpos, n);
/*
Make sure block is in modified_blocks
*/
if(block_checked_in_modified == false)
{
modified_blocks[blockpos] = block;
block_checked_in_modified = true;
}
}
catch(InvalidPositionException &e)
{
}
}
}
//END