53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
/*
|
|
Minetest
|
|
Copyright (C) 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 "database.h"
|
|
#include "irrlichttypes.h"
|
|
|
|
static s32 unsignedToSigned(s32 i, s32 max_positive)
|
|
{
|
|
if(i < max_positive)
|
|
return i;
|
|
else
|
|
return i - 2*max_positive;
|
|
}
|
|
|
|
// modulo of a negative number does not work consistently in C
|
|
static s64 pythonmodulo(s64 i, s64 mod)
|
|
{
|
|
if(i >= 0)
|
|
return i % mod;
|
|
return mod - ((-i) % mod);
|
|
}
|
|
|
|
long long Database::getBlockAsInteger(const v3s16 pos) {
|
|
return (unsigned long long)pos.Z*16777216 +
|
|
(unsigned long long)pos.Y*4096 +
|
|
(unsigned long long)pos.X;
|
|
}
|
|
|
|
v3s16 Database::getIntegerAsBlock(long long i) {
|
|
s32 x = unsignedToSigned(pythonmodulo(i, 4096), 2048);
|
|
i = (i - x) / 4096;
|
|
s32 y = unsignedToSigned(pythonmodulo(i, 4096), 2048);
|
|
i = (i - y) / 4096;
|
|
s32 z = unsignedToSigned(pythonmodulo(i, 4096), 2048);
|
|
return v3s16(x,y,z);
|
|
}
|