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Precalculate mapblock relative size. This permit to remove many s16 calculs on runtime

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This commit is contained in:
nerzhul 2015-07-29 10:49:40 +02:00
parent 88a6b9f52d
commit ca63f7f10d
2 changed files with 10 additions and 1 deletions
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1
src/mapblock.cpp
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@ -69,6 +69,7 @@ static const char *modified_reason_strings[] = {
MapBlock::MapBlock(Map *parent, v3s16 pos, IGameDef *gamedef, bool dummy): MapBlock::MapBlock(Map *parent, v3s16 pos, IGameDef *gamedef, bool dummy):
m_parent(parent), m_parent(parent),
m_pos(pos), m_pos(pos),
m_pos_relative(pos * MAP_BLOCKSIZE),
m_gamedef(gamedef), m_gamedef(gamedef),
m_modified(MOD_STATE_WRITE_NEEDED), m_modified(MOD_STATE_WRITE_NEEDED),
m_modified_reason(MOD_REASON_INITIAL), m_modified_reason(MOD_REASON_INITIAL),

10
src/mapblock.h
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@ -258,7 +258,7 @@ public:
inline v3s16 getPosRelative() inline v3s16 getPosRelative()
{ {
return m_pos * MAP_BLOCKSIZE; return m_pos_relative;
} }
inline core::aabbox3d<s16> getBox() inline core::aabbox3d<s16> getBox()
@ -564,6 +564,14 @@ private:
// Position in blocks on parent // Position in blocks on parent
v3s16 m_pos; v3s16 m_pos;
/* This is the precalculated m_pos_relative value
* This caches the value, improving performance by removing 3 s16 multiplications
* at runtime on each getPosRelative call
* For a 5 minutes runtime with valgrind this removes 3 * 19M s16 multiplications
* The gain can be estimated in Release Build to 3 * 100M multiply operations for 5 mins
*/
v3s16 m_pos_relative;
IGameDef *m_gamedef; IGameDef *m_gamedef;
/* /*