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Increase MapBlock::actuallyUpdateDayNightDiff() performance by 2-8x. ok @celeron55 

Before patch, function consumes up to ~8% of the main server loop. After, ~0% (below level of 2 places of significance)
This commit is contained in:
Craig Robbins 2015-02-07 17:52:56 +10:00 committed by Loic Blot
parent bb59a8543d
commit caf8d2a9d1
3 changed files with 36 additions and 17 deletions
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29
src/mapblock.cpp
View File

@ -330,47 +330,42 @@ void MapBlock::copyFrom(VoxelManipulator &dst)
void MapBlock::actuallyUpdateDayNightDiff()
{
INodeDefManager *nodemgr = m_gamedef->ndef();
// Running this function un-expires m_day_night_differs
m_day_night_differs_expired = false;
if(data == NULL)
{
if (data == NULL) {
m_day_night_differs = false;
return;
}
bool differs = false;
bool differs;
/*
Check if any lighting value differs
*/
for(u32 i=0; i<MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE; i++)
{
for (u32 i = 0; i < MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE; i++) {
MapNode &n = data[i];
if(n.getLight(LIGHTBANK_DAY, nodemgr) != n.getLight(LIGHTBANK_NIGHT, nodemgr))
{
differs = true;
differs = !n.isLightDayNightEq(nodemgr);
if (differs)
break;
}
}
/*
If some lighting values differ, check if the whole thing is
just air. If it is, differ = false
just air. If it is just air, differs = false
*/
if(differs)
{
if (differs) {
bool only_air = true;
for(u32 i=0; i<MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE; i++)
{
for (u32 i = 0; i < MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE; i++) {
MapNode &n = data[i];
if(n.getContent() != CONTENT_AIR)
{
if (n.getContent() != CONTENT_AIR) {
only_air = false;
break;
}
}
if(only_air)
if (only_air)
differs = false;
}

16
src/mapnode.cpp
View File

@ -74,6 +74,22 @@ void MapNode::setLight(enum LightBank bank, u8 a_light, INodeDefManager *nodemgr
assert(0);
}
bool MapNode::isLightDayNightEq(INodeDefManager *nodemgr) const
{
const ContentFeatures &f = nodemgr->get(*this);
bool isEqual;
if (f.param_type == CPT_LIGHT) {
u8 day = MYMAX(f.light_source, param1 & 0x0f);
u8 night = MYMAX(f.light_source, (param1 >> 4) & 0x0f);
isEqual = day == night;
} else {
isEqual = true;
}
return isEqual;
}
u8 MapNode::getLight(enum LightBank bank, INodeDefManager *nodemgr) const
{
// Select the brightest of [light source, propagated light]

8
src/mapnode.h
View File

@ -192,6 +192,14 @@ struct MapNode
}
void setLight(enum LightBank bank, u8 a_light, INodeDefManager *nodemgr);
/**
* Check if the light value for night differs from the light value for day.
*
* @return If the light values are equal, returns true; otherwise false
*/
bool isLightDayNightEq(INodeDefManager *nodemgr) const;
u8 getLight(enum LightBank bank, INodeDefManager *nodemgr) const;
/**