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Some performance optimizations (#5424)

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* Some performance optimizations

This is globally removing some memory useless copy

* use a const ref return on std::string Settings::get to prevent data copy on getters which doesn't need to copy it
 * pass some stack created strings to static const as they are not modified anywhere
 * Camera: return nametags per const ref instead of a list pointer, we only need to read it
 * INodeDefManager: getAll should be a result ref writer instead of a return copy
 * INodeDefManager: getAlias should return a const std::string ref
 * Minimap: unroll a Scolor creation in blitMinimapPixersToImageRadar to prvent many variable construct/destruct which are unneeded (we rewrite the content in the loop)
 * CNodeDefManager::updateAliases: prevent a idef getall copy
 * Profiler: constness
 * rollback_interface: create real_name later, and use const ref
 * MapBlockMesh updateFastFaceRow: unroll TileSpec next_tile, which has a cost of 1.8% CPU due to variable allocation/destruction,
 * MapBlockMesh updateFastFaceRow: copy next_tile to tile only if it's a different tilespec
 * MapBlockMesh updateFastFaceRow: use memcpy to copy next_lights to lights to do it in a single cpu operation
This commit is contained in:
Loïc Blot 2017-03-22 21:41:02 +01:00 • committed by GitHub
parent 9efc5da0fb
commit 072bbba69a
16 changed files with 79 additions and 134 deletions
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30
src/minimap.cpp
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@ -105,7 +105,7 @@ void MinimapUpdateThread::doUpdate()
// Swap two values in the map using single lookup
std::pair<std::map<v3s16, MinimapMapblock*>::iterator, bool>
result = m_blocks_cache.insert(std::make_pair(update.pos, update.data));
if (result.second == false) {
if (!result.second) {
delete result.first->second;
result.first->second = update.data;
}
@ -322,13 +322,15 @@ void Minimap::setAngle(f32 angle)
void Minimap::blitMinimapPixelsToImageRadar(video::IImage *map_image)
{
video::SColor c(240, 0, 0, 0);
for (s16 x = 0; x < data->map_size; x++)
for (s16 z = 0; z < data->map_size; z++) {
MinimapPixel *mmpixel = &data->minimap_scan[x + z * data->map_size];
video::SColor c(240, 0, 0, 0);
if (mmpixel->air_count > 0)
c.setGreen(core::clamp(core::round32(32 + mmpixel->air_count * 8), 0, 255));
else
c.setGreen(0);
map_image->setPixel(x, data->map_size - z - 1, c);
}
@ -337,21 +339,23 @@ void Minimap::blitMinimapPixelsToImageRadar(video::IImage *map_image)
void Minimap::blitMinimapPixelsToImageSurface(
video::IImage *map_image, video::IImage *heightmap_image)
{
// This variable creation/destruction has a 1% cost on rendering minimap
video::SColor tilecolor;
for (s16 x = 0; x < data->map_size; x++)
for (s16 z = 0; z < data->map_size; z++) {
MinimapPixel *mmpixel = &data->minimap_scan[x + z * data->map_size];
const ContentFeatures &f = m_ndef->get(mmpixel->n);
const TileDef *tile = &f.tiledef[0];
// Color of the 0th tile (mostly this is the topmost)
video::SColor tilecolor;
if(tile->has_color)
tilecolor = tile->color;
else
mmpixel->n.getColor(f, &tilecolor);
tilecolor.setRed(tilecolor.getRed() * f.minimap_color.getRed() / 255);
tilecolor.setGreen(tilecolor.getGreen() * f.minimap_color.getGreen()
/ 255);
tilecolor.setGreen(tilecolor.getGreen() * f.minimap_color.getGreen() / 255);
tilecolor.setBlue(tilecolor.getBlue() * f.minimap_color.getBlue() / 255);
tilecolor.setAlpha(240);
@ -391,7 +395,7 @@ video::ITexture *Minimap::getMinimapTexture()
if (minimap_mask) {
for (s16 y = 0; y < MINIMAP_MAX_SY; y++)
for (s16 x = 0; x < MINIMAP_MAX_SX; x++) {
video::SColor mask_col = minimap_mask->getPixel(x, y);
const video::SColor &mask_col = minimap_mask->getPixel(x, y);
if (!mask_col.getAlpha())
minimap_image->setPixel(x, y, video::SColor(0,0,0,0));
}
@ -430,7 +434,7 @@ scene::SMeshBuffer *Minimap::getMinimapMeshBuffer()
scene::SMeshBuffer *buf = new scene::SMeshBuffer();
buf->Vertices.set_used(4);
buf->Indices.set_used(6);
video::SColor c(255, 255, 255, 255);
static const video::SColor c(255, 255, 255, 255);
buf->Vertices[0] = video::S3DVertex(-1, -1, 0, 0, 0, 1, c, 0, 1);
buf->Vertices[1] = video::S3DVertex(-1, 1, 0, 0, 0, 1, c, 0, 0);
@ -550,15 +554,13 @@ void Minimap::updateActiveMarkers()
video::IImage *minimap_mask = data->minimap_shape_round ?
data->minimap_mask_round : data->minimap_mask_square;
std::list<Nametag *> *nametags = client->getCamera()->getNametags();
const std::list<Nametag *> &nametags = client->getCamera()->getNametags();
m_active_markers.clear();
for (std::list<Nametag *>::const_iterator
i = nametags->begin();
i != nametags->end(); ++i) {
Nametag *nametag = *i;
v3s16 pos = floatToInt(nametag->parent_node->getPosition() +
for (std::list<Nametag *>::const_iterator i = nametags.begin();
i != nametags.end(); ++i) {
v3s16 pos = floatToInt((*i)->parent_node->getPosition() +
intToFloat(client->getCamera()->getOffset(), BS), BS);
pos -= data->pos - v3s16(data->map_size / 2,
data->scan_height / 2,
@ -570,7 +572,7 @@ void Minimap::updateActiveMarkers()
}
pos.X = ((float)pos.X / data->map_size) * MINIMAP_MAX_SX;
pos.Z = ((float)pos.Z / data->map_size) * MINIMAP_MAX_SY;
video::SColor mask_col = minimap_mask->getPixel(pos.X, pos.Z);
const video::SColor &mask_col = minimap_mask->getPixel(pos.X, pos.Z);
if (!mask_col.getAlpha()) {
continue;
}