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Huge LBM lookup performance improvement on mapblock loading (#7195) 

* Huge LBM lookup performance improvement on mapblock loading
This commit is contained in:
Loïc Blot 2018-04-04 10:56:46 +02:00 committed by SmallJoker
parent fe41725e50
commit 396daf1be1
1 changed files with 20 additions and 11 deletions
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21
src/serverenvironment.cpp
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@ -262,16 +262,25 @@ void LBMManager::applyLBMs(ServerEnvironment *env, MapBlock *block, u32 stamp)
MapNode n;
content_t c;
lbm_lookup_map::const_iterator it = getLBMsIntroducedAfter(stamp);
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++)
{
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);
// 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 (std::vector<LoadingBlockModifierDef *>::const_iterator iit =