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53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
/*
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Minetest
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Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "database.h"
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#include "irrlichttypes.h"
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static s32 unsignedToSigned(s32 i, s32 max_positive)
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{
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if(i < max_positive)
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return i;
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else
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return i - 2*max_positive;
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}
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// modulo of a negative number does not work consistently in C
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static s64 pythonmodulo(s64 i, s64 mod)
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{
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if(i >= 0)
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return i % mod;
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return mod - ((-i) % mod);
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}
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long long Database::getBlockAsInteger(const v3s16 pos) {
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return (unsigned long long)pos.Z*16777216 +
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(unsigned long long)pos.Y*4096 +
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(unsigned long long)pos.X;
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}
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v3s16 Database::getIntegerAsBlock(long long i) {
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s32 x = unsignedToSigned(pythonmodulo(i, 4096), 2048);
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i = (i - x) / 4096;
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s32 y = unsignedToSigned(pythonmodulo(i, 4096), 2048);
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i = (i - y) / 4096;
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s32 z = unsignedToSigned(pythonmodulo(i, 4096), 2048);
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return v3s16(x,y,z);
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}
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