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Map generation limit: Fix checks for block/sector over-limit

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Fix the maths that check if any part of a mapblock or sector is over the
set map_generation_limit.
Therefore avoid the loading of any over-limit blocks that were previously
generated when map_generation_limit was larger. The set limit can vary
for a world because it is not yet a per-world mapgen parameter, even when
it is sometimes it will be changed deliberately.
Therefore avoid a player being returned to world centre if they re-enter
a world while being over-limit.

Fix the createSector() crash caused by a mob spawning over-limit in an
over-limit mapblock
This commit is contained in:
paramat 2016-12-27 17:00:47 +00:00
parent 1fee649f15
commit ddcf8422a2
2 changed files with 36 additions and 14 deletions
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21
src/map.cpp
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@ -2064,15 +2064,26 @@ ServerMapSector *ServerMap::createSector(v2s16 p2d)
return sector;
}
#endif
/*
Do not create over-limit
Do not create over-limit.
We are checking for any nodes of the mapblocks of the sector being beyond the limit.
A sector is a vertical column of mapblocks, so sectorpos is like a 2D blockpos.
At the negative limit we are checking for
block minimum nodepos < -mapgenlimit.
At the positive limit we are checking for
block maximum nodepos > mapgenlimit.
Block minimum nodepos = blockpos * mapblocksize.
Block maximum nodepos = (blockpos + 1) * mapblocksize - 1.
*/
const static u16 map_gen_limit = MYMIN(MAX_MAP_GENERATION_LIMIT,
g_settings->getU16("map_generation_limit"));
if(p2d.X < -map_gen_limit / MAP_BLOCKSIZE
|| p2d.X > map_gen_limit / MAP_BLOCKSIZE
|| p2d.Y < -map_gen_limit / MAP_BLOCKSIZE
|| p2d.Y > map_gen_limit / MAP_BLOCKSIZE)
if (p2d.X * MAP_BLOCKSIZE < -map_gen_limit
|| (p2d.X + 1) * MAP_BLOCKSIZE - 1 > map_gen_limit
|| p2d.Y * MAP_BLOCKSIZE < -map_gen_limit
|| (p2d.Y + 1) * MAP_BLOCKSIZE - 1 > map_gen_limit)
throw InvalidPositionException("createSector(): pos. over limit");
/*