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Increase performance of getLight() by at least 2x

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Leads to the following increases:
getSmoothLight() approx.     40% increase
getTileInfo() approx.        25% increase
MapBlockMesh::MapBlockMesh() 25-30%
This commit is contained in:
Craig Robbins 2014-12-10 00:45:07 +10:00
parent a1ea017b51
commit c5f6f9f77a
3 changed files with 29 additions and 2 deletions
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21
src/mapnode.h
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@ -108,6 +108,9 @@ enum Rotation {
#define LEVELED_MASK 0x3F
#define LEVELED_MAX LEVELED_MASK
struct ContentFeatures;
/*
This is the stuff what the whole world consists of.
*/
@ -188,6 +191,24 @@ struct MapNode
void setLight(enum LightBank bank, u8 a_light, INodeDefManager *nodemgr);
u8 getLight(enum LightBank bank, INodeDefManager *nodemgr) const;
/**
* This function differs from getLight(enum LightBank bank, INodeDefManager *nodemgr)
* in that the ContentFeatures of the node in question are not retrieved by
* the function itself. Thus, if you have already called nodemgr->get() to
* get the ContentFeatures you pass it to this function instead of the
* function getting ContentFeatures itself. Since INodeDefManager::get()
* is relatively expensive this can lead to significant performance
* improvements in some situations. Call this function if (and only if)
* you have already retrieved the ContentFeatures by calling
* INodeDefManager::get() for the node you're working with and the
* pre-conditions listed are true.
*
* @pre f != NULL
* @pre f->param_type == CPT_LIGHT
*/
u8 getLightNoChecks(LightBank bank, const ContentFeatures *f);
bool getLightBanks(u8 &lightday, u8 &lightnight, INodeDefManager *nodemgr) const;
// 0 <= daylight_factor <= 1000