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Reduce wasteful memory allocations in update_lighting_nodes()

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This commit is contained in:
sfan5
2024-04-23 21:50:47 +02:00
parent c24a04d246
commit e10adf83d5
1 changed files with 38 additions and 21 deletions
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59
src/voxelalgorithms.cpp
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@@ -17,6 +17,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <array>
#include "voxelalgorithms.h"
#include "nodedef.h"
#include "mapblock.h"
@@ -51,12 +53,12 @@ typedef v3s16 mapblock_v3;
//! Contains information about a node whose light is about to change.
struct ChangingLight {
//! Pointer to the node's block.
MapBlock *block = nullptr;
//! Relative position of the node in its map block.
relative_v3 rel_position;
//! Position of the node's block.
mapblock_v3 block_position;
//! Pointer to the node's block.
MapBlock *block = NULL;
/*!
* Direction from the node that caused this node's changing
* to this node.
@@ -67,9 +69,9 @@ struct ChangingLight {
ChangingLight(relative_v3 rel_pos, mapblock_v3 block_pos,
MapBlock *b, direction source_dir) :
block(b),
rel_position(rel_pos),
block_position(block_pos),
block(b),
source_direction(source_dir)
{}
};
@@ -81,7 +83,7 @@ struct ChangingLight {
*/
struct LightQueue {
//! For each light level there is a vector.
std::vector<ChangingLight> lights[LIGHT_SUN + 1];
std::array<std::vector<ChangingLight>, LIGHT_SUN + 1> lights;
//! Light of the brightest ChangingLight in the queue.
u8 max_light;
@@ -92,9 +94,15 @@ struct LightQueue {
LightQueue(size_t reserve)
{
max_light = LIGHT_SUN;
for (u8 i = 0; i <= LIGHT_SUN; i++) {
lights[i].reserve(reserve);
}
for (auto &l : lights)
l.reserve(reserve);
}
//! Clears a LightQueue.
void clear() {
max_light = LIGHT_SUN;
for (auto &l : lights)
l.clear();
}
/*!
@@ -456,7 +464,7 @@ bool is_sunlight_above(Map *map, v3s16 pos, const NodeDefManager *ndef)
return sunlight;
}
static const LightBank banks[] = { LIGHTBANK_DAY, LIGHTBANK_NIGHT };
static constexpr LightBank banks[] = { LIGHTBANK_DAY, LIGHTBANK_NIGHT };
void update_lighting_nodes(Map *map,
const std::vector<std::pair<v3s16, MapNode>> &oldnodes,
@@ -466,10 +474,14 @@ void update_lighting_nodes(Map *map,
// For node getter functions
bool is_valid_position;
// cached allocations
thread_local UnlightQueue disappearing_lights(1);
thread_local ReLightQueue light_sources(4);
// Process each light bank separately
for (LightBank bank : banks) {
UnlightQueue disappearing_lights(256);
ReLightQueue light_sources(256);
disappearing_lights.clear();
light_sources.clear();
// Nodes that are brighter than the brightest modified node was
// won't change, since they didn't get their light from a
// modified node.
@@ -634,14 +646,16 @@ void update_lighting_nodes(Map *map,
* Borders of a map block in relative node coordinates.
* Compatible with type 'direction'.
*/
const VoxelArea block_borders[] = {
VoxelArea(v3s16(15, 0, 0), v3s16(15, 15, 15)), //X+
VoxelArea(v3s16(0, 15, 0), v3s16(15, 15, 15)), //Y+
VoxelArea(v3s16(0, 0, 15), v3s16(15, 15, 15)), //Z+
VoxelArea(v3s16(0, 0, 0), v3s16(15, 15, 0)), //Z-
VoxelArea(v3s16(0, 0, 0), v3s16(15, 0, 15)), //Y-
VoxelArea(v3s16(0, 0, 0), v3s16(0, 15, 15)) //X-
#define B_1 (MAP_BLOCKSIZE - 1)
const static VoxelArea block_borders[] = {
VoxelArea(v3s16(B_1, 0, 0), v3s16(B_1, B_1, B_1)), //X+
VoxelArea(v3s16(0, B_1, 0), v3s16(B_1, B_1, B_1)), //Y+
VoxelArea(v3s16(0, 0, B_1), v3s16(B_1, B_1, B_1)), //Z+
VoxelArea(v3s16(0, 0, 0), v3s16(B_1, B_1, 0)), //Z-
VoxelArea(v3s16(0, 0, 0), v3s16(B_1, 0, B_1)), //Y-
VoxelArea(v3s16(0, 0, 0), v3s16(0, B_1, B_1)) //X-
};
#undef B_1
/*!
* Returns true if:
@@ -679,11 +693,14 @@ void update_block_border_lighting(Map *map, MapBlock *block,
std::map<v3s16, MapBlock*> &modified_blocks)
{
const NodeDefManager *ndef = map->getNodeDefManager();
// Since invalid light is not common, do not allocate
// memory if not needed.
UnlightQueue disappearing_lights(0);
ReLightQueue light_sources(0);
for (LightBank bank : banks) {
// Since invalid light is not common, do not allocate
// memory if not needed.
UnlightQueue disappearing_lights(0);
ReLightQueue light_sources(0);
disappearing_lights.clear();
light_sources.clear();
// Get incorrect lights
for (direction d = 0; d < 6; d++) {
// For each direction