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Huge LBM lookup performance improvement on mapblock loading (#7195)
* Huge LBM lookup performance improvement on mapblock loading
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nerzhul committed Apr 4, 2018
1 parent 5070ca2 commit 392e80e3f13c977b5499eb424fa7d65085fb08f5
Showing 1 changed file with 20 additions and 11 deletions.
@@ -254,23 +254,32 @@ void LBMManager::applyLBMs(ServerEnvironment *env, MapBlock *block, u32 stamp)
MapNode n;
content_t c;
lbm_lookup_map::const_iterator it = getLBMsIntroducedAfter(stamp);
for (pos.X = 0; pos.X < MAP_BLOCKSIZE; pos.X++)
for (pos.Y = 0; pos.Y < MAP_BLOCKSIZE; pos.Y++)
for (pos.Z = 0; pos.Z < MAP_BLOCKSIZE; pos.Z++)
{
n = block->getNodeNoEx(pos);
c = n.getContent();
for (LBMManager::lbm_lookup_map::const_iterator iit = it;
iit != m_lbm_lookup.end(); ++iit) {
const std::vector<LoadingBlockModifierDef *> *lbm_list =
iit->second.lookup(c);
for (; it != m_lbm_lookup.end(); ++it) {
// Cache previous version to speedup lookup which has a very high performance
// penalty on each call
content_t previous_c{};
std::vector<LoadingBlockModifierDef *> *lbm_list = nullptr;

for (pos.X = 0; pos.X < MAP_BLOCKSIZE; pos.X++)
for (pos.Y = 0; pos.Y < MAP_BLOCKSIZE; pos.Y++)
for (pos.Z = 0; pos.Z < MAP_BLOCKSIZE; pos.Z++) {
n = block->getNodeNoEx(pos);
c = n.getContent();

// If content_t are not matching perform an LBM lookup
if (previous_c != c) {
lbm_list = (std::vector<LoadingBlockModifierDef *> *)
it->second.lookup(c);
previous_c = c;
}

if (!lbm_list)
continue;
for (auto lbmdef : *lbm_list) {
lbmdef->trigger(env, pos + pos_of_block, n);
}
}
}
}
}

/*

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