src/client/mesh_generator_thread.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2013, 2017 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "mesh_generator_thread.h"
  21 #include "settings.h"
  22 #include "profiler.h"
  23 #include "client.h"
  24 #include "mapblock.h"
  25 #include "map.h"
  26 #include "util/directiontables.h"
  27
  28 /*
  29         CachedMapBlockData
  30 */
  31
  32 CachedMapBlockData::~CachedMapBlockData()
  33 {
  34         assert(refcount_from_queue == 0);
  35
  36         delete[] data;
  37 }
  38
  39 /*
  40         QueuedMeshUpdate
  41 */
  42
  43 QueuedMeshUpdate::~QueuedMeshUpdate()
  44 {
  45         delete data;
  46 }
  47
  48 /*
  49         MeshUpdateQueue
  50 */
  51
  52 MeshUpdateQueue::MeshUpdateQueue(Client *client):
  53         m_client(client),
  54         m_next_cache_cleanup(0)
  55 {
  56         m_cache_enable_shaders = g_settings->getBool("enable_shaders");
  57         m_cache_smooth_lighting = g_settings->getBool("smooth_lighting");
  58         m_meshgen_block_cache_size = g_settings->getS32("meshgen_block_cache_size");
  59 }
  60
  61 MeshUpdateQueue::~MeshUpdateQueue()
  62 {
  63         MutexAutoLock lock(m_mutex);
  64
  65         for (auto &i : m_cache) {
  66                 delete i.second;
  67         }
  68
  69         for (QueuedMeshUpdate *q : m_queue) {
  70                 delete q;
  71         }
  72 }
  73
  74 bool MeshUpdateQueue::addBlock(Map *map, v3s16 p, bool ack_block_to_server, bool urgent)
  75 {
  76         MutexAutoLock lock(m_mutex);
  77
  78         cleanupCache();
  79
  80         /*
  81                 Cache the block data (force-update the center block, don't update the
  82                 neighbors but get them if they aren't already cached)
  83         */
  84         std::vector<CachedMapBlockData*> cached_blocks;
  85         size_t cache_hit_counter = 0;
  86         CachedMapBlockData *cached_block = cacheBlock(map, p, FORCE_UPDATE);
  87         if (!cached_block->data)
  88                 return false; // nothing to update
  89         cached_blocks.reserve(3*3*3);
  90         cached_blocks.push_back(cached_block);
  91         for (v3s16 dp : g_26dirs)
  92                 cached_blocks.push_back(cacheBlock(map, p + dp,
  93                                 SKIP_UPDATE_IF_ALREADY_CACHED,
  94                                 &cache_hit_counter));
  95         g_profiler->avg("MeshUpdateQueue: MapBlocks from cache [%]",
  96                         100.0f * cache_hit_counter / cached_blocks.size());
  97
  98         /*
  99                 Mark the block as urgent if requested
 100         */
 101         if (urgent)
 102                 m_urgents.insert(p);
 103
 104         /*
 105                 Find if block is already in queue.
 106                 If it is, update the data and quit.
 107         */
 108         for (QueuedMeshUpdate *q : m_queue) {
 109                 if (q->p == p) {
 110                         // NOTE: We are not adding a new position to the queue, thus
 111                         //       refcount_from_queue stays the same.
 112                         if(ack_block_to_server)
 113                                 q->ack_block_to_server = true;
 114                         q->crack_level = m_client->getCrackLevel();
 115                         q->crack_pos = m_client->getCrackPos();
 116                         return true;
 117                 }
 118         }
 119
 120         /*
 121                 Add the block
 122         */
 123         QueuedMeshUpdate *q = new QueuedMeshUpdate;
 124         q->p = p;
 125         q->ack_block_to_server = ack_block_to_server;
 126         q->crack_level = m_client->getCrackLevel();
 127         q->crack_pos = m_client->getCrackPos();
 128         m_queue.push_back(q);
 129
 130         // This queue entry is a new reference to the cached blocks
 131         for (CachedMapBlockData *cached_block : cached_blocks) {
 132                 cached_block->refcount_from_queue++;
 133         }
 134         return true;
 135 }
 136
 137 // Returned pointer must be deleted
 138 // Returns NULL if queue is empty
 139 QueuedMeshUpdate *MeshUpdateQueue::pop()
 140 {
 141         MutexAutoLock lock(m_mutex);
 142
 143         bool must_be_urgent = !m_urgents.empty();
 144         for (std::vector<QueuedMeshUpdate*>::iterator i = m_queue.begin();
 145                         i != m_queue.end(); ++i) {
 146                 QueuedMeshUpdate *q = *i;
 147                 if(must_be_urgent && m_urgents.count(q->p) == 0)
 148                         continue;
 149                 m_queue.erase(i);
 150                 m_urgents.erase(q->p);
 151                 fillDataFromMapBlockCache(q);
 152                 return q;
 153         }
 154         return NULL;
 155 }
 156
 157 CachedMapBlockData* MeshUpdateQueue::cacheBlock(Map *map, v3s16 p, UpdateMode mode,
 158                         size_t *cache_hit_counter)
 159 {
 160         CachedMapBlockData *cached_block = nullptr;
 161         auto it = m_cache.find(p);
 162
 163         if (it != m_cache.end()) {
 164                 cached_block = it->second;
 165
 166                 if (mode == SKIP_UPDATE_IF_ALREADY_CACHED) {
 167                         if (cache_hit_counter)
 168                                 (*cache_hit_counter)++;
 169                         return cached_block;
 170                 }
 171         }
 172
 173         if (!cached_block) {
 174                 // Not yet in cache
 175                 cached_block = new CachedMapBlockData();
 176                 m_cache[p] = cached_block;
 177         }
 178
 179         MapBlock *b = map->getBlockNoCreateNoEx(p);
 180         if (b) {
 181                 if (!cached_block->data)
 182                         cached_block->data =
 183                                         new MapNode[MAP_BLOCKSIZE * MAP_BLOCKSIZE * MAP_BLOCKSIZE];
 184                 memcpy(cached_block->data, b->getData(),
 185                                 MAP_BLOCKSIZE * MAP_BLOCKSIZE * MAP_BLOCKSIZE * sizeof(MapNode));
 186         } else {
 187                 delete[] cached_block->data;
 188                 cached_block->data = nullptr;
 189         }
 190         return cached_block;
 191 }
 192
 193 CachedMapBlockData* MeshUpdateQueue::getCachedBlock(const v3s16 &p)
 194 {
 195         auto it = m_cache.find(p);
 196         if (it != m_cache.end()) {
 197                 return it->second;
 198         }
 199         return NULL;
 200 }
 201
 202 void MeshUpdateQueue::fillDataFromMapBlockCache(QueuedMeshUpdate *q)
 203 {
 204         MeshMakeData *data = new MeshMakeData(m_client, m_cache_enable_shaders);
 205         q->data = data;
 206
 207         data->fillBlockDataBegin(q->p);
 208
 209         std::time_t t_now = std::time(0);
 210
 211         // Collect data for 3*3*3 blocks from cache
 212         for (v3s16 dp : g_27dirs) {
 213                 v3s16 p = q->p + dp;
 214                 CachedMapBlockData *cached_block = getCachedBlock(p);
 215                 if (cached_block) {
 216                         cached_block->refcount_from_queue--;
 217                         cached_block->last_used_timestamp = t_now;
 218                         if (cached_block->data)
 219                                 data->fillBlockData(dp, cached_block->data);
 220                 }
 221         }
 222
 223         data->setCrack(q->crack_level, q->crack_pos);
 224         data->setSmoothLighting(m_cache_smooth_lighting);
 225 }
 226
 227 void MeshUpdateQueue::cleanupCache()
 228 {
 229         const int mapblock_kB = MAP_BLOCKSIZE * MAP_BLOCKSIZE * MAP_BLOCKSIZE *
 230                         sizeof(MapNode) / 1000;
 231         g_profiler->avg("MeshUpdateQueue MapBlock cache size kB",
 232                         mapblock_kB * m_cache.size());
 233
 234         // Iterating the entire cache can get pretty expensive so don't do it too often
 235         {
 236                 constexpr int cleanup_interval = 250;
 237                 const u64 now = porting::getTimeMs();
 238                 if (m_next_cache_cleanup > now)
 239                         return;
 240                 m_next_cache_cleanup = now + cleanup_interval;
 241         }
 242
 243         // The cache size is kept roughly below cache_soft_max_size, not letting
 244         // anything get older than cache_seconds_max or deleted before 2 seconds.
 245         const int cache_seconds_max = 10;
 246         const int cache_soft_max_size = m_meshgen_block_cache_size * 1000 / mapblock_kB;
 247         int cache_seconds = MYMAX(2, cache_seconds_max -
 248                         m_cache.size() / (cache_soft_max_size / cache_seconds_max));
 249
 250         int t_now = time(0);
 251
 252         for (auto it = m_cache.begin(); it != m_cache.end(); ) {
 253                 CachedMapBlockData *cached_block = it->second;
 254                 if (cached_block->refcount_from_queue == 0 &&
 255                                 cached_block->last_used_timestamp < t_now - cache_seconds) {
 256                         it = m_cache.erase(it);
 257                         delete cached_block;
 258                 } else {
 259                         ++it;
 260                 }
 261         }
 262 }
 263
 264 /*
 265         MeshUpdateThread
 266 */
 267
 268 MeshUpdateThread::MeshUpdateThread(Client *client):
 269         UpdateThread("Mesh"),
 270         m_queue_in(client)
 271 {
 272         m_generation_interval = g_settings->getU16("mesh_generation_interval");
 273         m_generation_interval = rangelim(m_generation_interval, 0, 50);
 274 }
 275
 276 void MeshUpdateThread::updateBlock(Map *map, v3s16 p, bool ack_block_to_server,
 277                 bool urgent, bool update_neighbors)
 278 {
 279         static thread_local const bool many_neighbors =
 280                         g_settings->getBool("smooth_lighting")
 281                         && !g_settings->getFlag("performance_tradeoffs");
 282         if (!m_queue_in.addBlock(map, p, ack_block_to_server, urgent)) {
 283                 warningstream << "Update requested for non-existent block at ("
 284                                 << p.X << ", " << p.Y << ", " << p.Z << ")" << std::endl;
 285                 return;
 286         }
 287         if (update_neighbors) {
 288                 if (many_neighbors) {
 289                         for (v3s16 dp : g_26dirs)
 290                                 m_queue_in.addBlock(map, p + dp, false, urgent);
 291                 } else {
 292                         for (v3s16 dp : g_6dirs)
 293                                 m_queue_in.addBlock(map, p + dp, false, urgent);
 294                 }
 295         }
 296         deferUpdate();
 297 }
 298
 299 void MeshUpdateThread::doUpdate()
 300 {
 301         QueuedMeshUpdate *q;
 302         while ((q = m_queue_in.pop())) {
 303                 if (m_generation_interval)
 304                         sleep_ms(m_generation_interval);
 305                 ScopeProfiler sp(g_profiler, "Client: Mesh making (sum)");
 306
 307                 MapBlockMesh *mesh_new = new MapBlockMesh(q->data, m_camera_offset);
 308
 309                 MeshUpdateResult r;
 310                 r.p = q->p;
 311                 r.mesh = mesh_new;
 312                 r.ack_block_to_server = q->ack_block_to_server;
 313
 314                 m_queue_out.push_back(r);
 315
 316                 delete q;
 317         }
 318 }