From 20a85d76d94c9c5c7fbe198c3d0e1fbee97a485f Mon Sep 17 00:00:00 2001 From: Vitaliy Date: Thu, 9 Nov 2017 01:56:20 +0300 Subject: Move files to subdirectories (#6599) * Move files around --- src/database/database.cpp | 69 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 src/database/database.cpp (limited to 'src/database/database.cpp') diff --git a/src/database/database.cpp b/src/database/database.cpp new file mode 100644 index 000000000..12e0e1a0f --- /dev/null +++ b/src/database/database.cpp @@ -0,0 +1,69 @@ +/* +Minetest +Copyright (C) 2013 celeron55, Perttu Ahola + +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" + + +/**************** + * Black magic! * + **************** + * The position hashing is very messed up. + * It's a lot more complicated than it looks. + */ + +static inline s16 unsigned_to_signed(u16 i, u16 max_positive) +{ + if (i < max_positive) { + return i; + } + + return i - (max_positive * 2); +} + + +// Modulo of a negative number does not work consistently in C +static inline s64 pythonmodulo(s64 i, s16 mod) +{ + if (i >= 0) { + return i % mod; + } + return mod - ((-i) % mod); +} + + +s64 MapDatabase::getBlockAsInteger(const v3s16 &pos) +{ + return (u64) pos.Z * 0x1000000 + + (u64) pos.Y * 0x1000 + + (u64) pos.X; +} + + +v3s16 MapDatabase::getIntegerAsBlock(s64 i) +{ + v3s16 pos; + pos.X = unsigned_to_signed(pythonmodulo(i, 4096), 2048); + i = (i - pos.X) / 4096; + pos.Y = unsigned_to_signed(pythonmodulo(i, 4096), 2048); + i = (i - pos.Y) / 4096; + pos.Z = unsigned_to_signed(pythonmodulo(i, 4096), 2048); + return pos; +} + -- cgit v1.2.3