minetest/src/emerge.cpp

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/*
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Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
Copyright (C) 2010-2013 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "emerge.h"
#include <iostream>
#include <queue>
#include "util/container.h"
#include "util/thread.h"
#include "threading/event.h"
#include "config.h"
#include "constants.h"
#include "environment.h"
#include "log.h"
#include "map.h"
#include "mapblock.h"
#include "mapgen/mg_biome.h"
#include "mapgen/mg_ore.h"
#include "mapgen/mg_decoration.h"
#include "mapgen/mg_schematic.h"
#include "nodedef.h"
#include "profiler.h"
#include "scripting_server.h"
#include "server.h"
#include "settings.h"
#include "voxel.h"
class EmergeThread : public Thread {
public:
bool enable_mapgen_debug_info;
int id;
EmergeThread(Server *server, int ethreadid);
~EmergeThread() = default;
void *run();
void signal();
// Requires queue mutex held
bool pushBlock(const v3s16 &pos);
void cancelPendingItems();
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protected:
void runCompletionCallbacks(
const v3s16 &pos, EmergeAction action,
const EmergeCallbackList &callbacks);
private:
Server *m_server;
ServerMap *m_map;
EmergeManager *m_emerge;
Mapgen *m_mapgen;
Event m_queue_event;
std::queue<v3s16> m_block_queue;
bool popBlockEmerge(v3s16 *pos, BlockEmergeData *bedata);
EmergeAction getBlockOrStartGen(
const v3s16 &pos, bool allow_gen, MapBlock **block, BlockMakeData *data);
MapBlock *finishGen(v3s16 pos, BlockMakeData *bmdata,
std::map<v3s16, MapBlock *> *modified_blocks);
friend class EmergeManager;
};
class MapEditEventAreaIgnorer
{
public:
MapEditEventAreaIgnorer(VoxelArea *ignorevariable, const VoxelArea &a):
m_ignorevariable(ignorevariable)
{
if(m_ignorevariable->getVolume() == 0)
*m_ignorevariable = a;
else
m_ignorevariable = NULL;
}
~MapEditEventAreaIgnorer()
{
if(m_ignorevariable)
{
assert(m_ignorevariable->getVolume() != 0);
*m_ignorevariable = VoxelArea();
}
}
private:
VoxelArea *m_ignorevariable;
};
EmergeParams::~EmergeParams()
{
infostream << "EmergeParams: destroying " << this << std::endl;
// Delete everything that was cloned on creation of EmergeParams
delete biomegen;
delete biomemgr;
delete oremgr;
delete decomgr;
delete schemmgr;
}
EmergeParams::EmergeParams(EmergeManager *parent, const BiomeGen *biomegen,
const BiomeManager *biomemgr,
const OreManager *oremgr, const DecorationManager *decomgr,
const SchematicManager *schemmgr) :
ndef(parent->ndef),
enable_mapgen_debug_info(parent->enable_mapgen_debug_info),
gen_notify_on(parent->gen_notify_on),
gen_notify_on_deco_ids(&parent->gen_notify_on_deco_ids),
biomemgr(biomemgr->clone()), oremgr(oremgr->clone()),
decomgr(decomgr->clone()), schemmgr(schemmgr->clone())
{
this->biomegen = biomegen->clone(this->biomemgr);
}
////
//// EmergeManager
////
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EmergeManager::EmergeManager(Server *server, MetricsBackend *mb)
{
this->ndef = server->getNodeDefManager();
this->biomemgr = new BiomeManager(server);
this->oremgr = new OreManager(server);
this->decomgr = new DecorationManager(server);
this->schemmgr = new SchematicManager(server);
// initialized later
this->mgparams = nullptr;
this->biomegen = nullptr;
// Note that accesses to this variable are not synchronized.
// This is because the *only* thread ever starting or stopping
// EmergeThreads should be the ServerThread.
enable_mapgen_debug_info = g_settings->getBool("enable_mapgen_debug_info");
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STATIC_ASSERT(ARRLEN(emergeActionStrs) == ARRLEN(m_completed_emerge_counter),
enum_size_mismatches);
for (u32 i = 0; i < ARRLEN(m_completed_emerge_counter); i++) {
std::string help_str("Number of completed emerges with status ");
help_str.append(emergeActionStrs[i]);
m_completed_emerge_counter[i] = mb->addCounter(
"minetest_emerge_completed", help_str,
{{"status", emergeActionStrs[i]}}
);
}
s16 nthreads = 1;
g_settings->getS16NoEx("num_emerge_threads", nthreads);
// If automatic, leave a proc for the main thread and one for
// some other misc thread
if (nthreads <= 0)
nthreads = Thread::getNumberOfProcessors() - 2;
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if (nthreads < 1)
nthreads = 1;
m_qlimit_total = g_settings->getU32("emergequeue_limit_total");
// FIXME: these fallback values are probably not good
if (!g_settings->getU32NoEx("emergequeue_limit_diskonly", m_qlimit_diskonly))
m_qlimit_diskonly = nthreads * 5 + 1;
if (!g_settings->getU32NoEx("emergequeue_limit_generate", m_qlimit_generate))
m_qlimit_generate = nthreads + 1;
// don't trust user input for something very important like this
m_qlimit_total = rangelim(m_qlimit_total, 1, 1000000);
m_qlimit_diskonly = rangelim(m_qlimit_diskonly, 1, 1000000);
m_qlimit_generate = rangelim(m_qlimit_generate, 1, 1000000);
for (s16 i = 0; i < nthreads; i++)
m_threads.push_back(new EmergeThread(server, i));
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infostream << "EmergeManager: using " << nthreads << " threads" << std::endl;
}
EmergeManager::~EmergeManager()
{
for (u32 i = 0; i != m_threads.size(); i++) {
EmergeThread *thread = m_threads[i];
if (m_threads_active) {
thread->stop();
thread->signal();
thread->wait();
}
delete thread;
// Mapgen init might not be finished if there is an error during startup.
if (m_mapgens.size() > i)
delete m_mapgens[i];
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}
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delete biomegen;
delete biomemgr;
delete oremgr;
delete decomgr;
delete schemmgr;
}
BiomeManager *EmergeManager::getWritableBiomeManager()
{
FATAL_ERROR_IF(!m_mapgens.empty(),
"Writable managers can only be returned before mapgen init");
return biomemgr;
}
OreManager *EmergeManager::getWritableOreManager()
{
FATAL_ERROR_IF(!m_mapgens.empty(),
"Writable managers can only be returned before mapgen init");
return oremgr;
}
DecorationManager *EmergeManager::getWritableDecorationManager()
{
FATAL_ERROR_IF(!m_mapgens.empty(),
"Writable managers can only be returned before mapgen init");
return decomgr;
}
SchematicManager *EmergeManager::getWritableSchematicManager()
{
FATAL_ERROR_IF(!m_mapgens.empty(),
"Writable managers can only be returned before mapgen init");
return schemmgr;
}
void EmergeManager::initMapgens(MapgenParams *params)
{
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FATAL_ERROR_IF(!m_mapgens.empty(), "Mapgen already initialised.");
mgparams = params;
v3s16 csize = v3s16(1, 1, 1) * (params->chunksize * MAP_BLOCKSIZE);
biomegen = biomemgr->createBiomeGen(BIOMEGEN_ORIGINAL, params->bparams, csize);
for (u32 i = 0; i != m_threads.size(); i++) {
EmergeParams *p = new EmergeParams(this, biomegen,
biomemgr, oremgr, decomgr, schemmgr);
infostream << "EmergeManager: Created params " << p
<< " for thread " << i << std::endl;
m_mapgens.push_back(Mapgen::createMapgen(params->mgtype, params, p));
}
}
Mapgen *EmergeManager::getCurrentMapgen()
{
if (!m_threads_active)
return nullptr;
for (u32 i = 0; i != m_threads.size(); i++) {
EmergeThread *t = m_threads[i];
if (t->isRunning() && t->isCurrentThread())
return t->m_mapgen;
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}
return nullptr;
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}
void EmergeManager::startThreads()
{
if (m_threads_active)
return;
for (u32 i = 0; i != m_threads.size(); i++)
m_threads[i]->start();
m_threads_active = true;
}
void EmergeManager::stopThreads()
{
if (!m_threads_active)
return;
// Request thread stop in parallel
for (u32 i = 0; i != m_threads.size(); i++) {
m_threads[i]->stop();
m_threads[i]->signal();
}
// Then do the waiting for each
for (u32 i = 0; i != m_threads.size(); i++)
m_threads[i]->wait();
m_threads_active = false;
}
bool EmergeManager::isRunning()
{
return m_threads_active;
}
bool EmergeManager::enqueueBlockEmerge(
session_t peer_id,
v3s16 blockpos,
bool allow_generate,
bool ignore_queue_limits)
{
u16 flags = 0;
if (allow_generate)
flags |= BLOCK_EMERGE_ALLOW_GEN;
if (ignore_queue_limits)
flags |= BLOCK_EMERGE_FORCE_QUEUE;
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return enqueueBlockEmergeEx(blockpos, peer_id, flags, NULL, NULL);
}
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bool EmergeManager::enqueueBlockEmergeEx(
v3s16 blockpos,
session_t peer_id,
u16 flags,
EmergeCompletionCallback callback,
void *callback_param)
{
EmergeThread *thread = NULL;
bool entry_already_exists = false;
{
MutexAutoLock queuelock(m_queue_mutex);
if (!pushBlockEmergeData(blockpos, peer_id, flags,
callback, callback_param, &entry_already_exists))
return false;
if (entry_already_exists)
return true;
thread = getOptimalThread();
thread->pushBlock(blockpos);
}
thread->signal();
return true;
}
bool EmergeManager::isBlockInQueue(v3s16 pos)
{
MutexAutoLock queuelock(m_queue_mutex);
return m_blocks_enqueued.find(pos) != m_blocks_enqueued.end();
}
//
// Mapgen-related helper functions
//
// TODO(hmmmm): Move this to ServerMap
v3s16 EmergeManager::getContainingChunk(v3s16 blockpos, s16 chunksize)
{
s16 coff = -chunksize / 2;
v3s16 chunk_offset(coff, coff, coff);
return getContainerPos(blockpos - chunk_offset, chunksize)
* chunksize + chunk_offset;
}
int EmergeManager::getSpawnLevelAtPoint(v2s16 p)
{
if (m_mapgens.empty() || !m_mapgens[0]) {
errorstream << "EmergeManager: getSpawnLevelAtPoint() called"
" before mapgen init" << std::endl;
return 0;
}
return m_mapgens[0]->getSpawnLevelAtPoint(p);
}
// TODO(hmmmm): Move this to ServerMap
bool EmergeManager::isBlockUnderground(v3s16 blockpos)
{
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// Use a simple heuristic
return blockpos.Y * (MAP_BLOCKSIZE + 1) <= mgparams->water_level;
}
bool EmergeManager::pushBlockEmergeData(
v3s16 pos,
u16 peer_requested,
u16 flags,
EmergeCompletionCallback callback,
void *callback_param,
bool *entry_already_exists)
{
u32 &count_peer = m_peer_queue_count[peer_requested];
if ((flags & BLOCK_EMERGE_FORCE_QUEUE) == 0) {
if (m_blocks_enqueued.size() >= m_qlimit_total)
return false;
if (peer_requested != PEER_ID_INEXISTENT) {
u32 qlimit_peer = (flags & BLOCK_EMERGE_ALLOW_GEN) ?
m_qlimit_generate : m_qlimit_diskonly;
if (count_peer >= qlimit_peer)
return false;
} else {
// limit block enqueue requests for active blocks to 1/2 of total
if (count_peer * 2 >= m_qlimit_total)
return false;
}
}
std::pair<std::map<v3s16, BlockEmergeData>::iterator, bool> findres;
findres = m_blocks_enqueued.insert(std::make_pair(pos, BlockEmergeData()));
BlockEmergeData &bedata = findres.first->second;
*entry_already_exists = !findres.second;
if (callback)
bedata.callbacks.emplace_back(callback, callback_param);
if (*entry_already_exists) {
bedata.flags |= flags;
} else {
bedata.flags = flags;
bedata.peer_requested = peer_requested;
count_peer++;
}
return true;
}
bool EmergeManager::popBlockEmergeData(v3s16 pos, BlockEmergeData *bedata)
{
auto it = m_blocks_enqueued.find(pos);
if (it == m_blocks_enqueued.end())
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return false;
*bedata = it->second;
auto it2 = m_peer_queue_count.find(bedata->peer_requested);
if (it2 == m_peer_queue_count.end())
return false;
u32 &count_peer = it2->second;
assert(count_peer != 0);
count_peer--;
m_blocks_enqueued.erase(it);
return true;
}
EmergeThread *EmergeManager::getOptimalThread()
{
size_t nthreads = m_threads.size();
FATAL_ERROR_IF(nthreads == 0, "No emerge threads!");
size_t index = 0;
size_t nitems_lowest = m_threads[0]->m_block_queue.size();
for (size_t i = 1; i < nthreads; i++) {
size_t nitems = m_threads[i]->m_block_queue.size();
if (nitems < nitems_lowest) {
index = i;
nitems_lowest = nitems;
}
}
return m_threads[index];
}
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void EmergeManager::reportCompletedEmerge(EmergeAction action)
{
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assert((size_t)action < ARRLEN(m_completed_emerge_counter));
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m_completed_emerge_counter[(int)action]->increment();
}
////
//// EmergeThread
////
EmergeThread::EmergeThread(Server *server, int ethreadid) :
enable_mapgen_debug_info(false),
id(ethreadid),
m_server(server),
m_map(NULL),
m_emerge(NULL),
m_mapgen(NULL)
{
m_name = "Emerge-" + itos(ethreadid);
}
void EmergeThread::signal()
{
m_queue_event.signal();
}
bool EmergeThread::pushBlock(const v3s16 &pos)
{
m_block_queue.push(pos);
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return true;
}
void EmergeThread::cancelPendingItems()
{
MutexAutoLock queuelock(m_emerge->m_queue_mutex);
while (!m_block_queue.empty()) {
BlockEmergeData bedata;
v3s16 pos;
pos = m_block_queue.front();
m_block_queue.pop();
m_emerge->popBlockEmergeData(pos, &bedata);
runCompletionCallbacks(pos, EMERGE_CANCELLED, bedata.callbacks);
}
}
void EmergeThread::runCompletionCallbacks(const v3s16 &pos, EmergeAction action,
const EmergeCallbackList &callbacks)
{
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m_emerge->reportCompletedEmerge(action);
for (size_t i = 0; i != callbacks.size(); i++) {
EmergeCompletionCallback callback;
void *param;
callback = callbacks[i].first;
param = callbacks[i].second;
callback(pos, action, param);
}
}
bool EmergeThread::popBlockEmerge(v3s16 *pos, BlockEmergeData *bedata)
{
MutexAutoLock queuelock(m_emerge->m_queue_mutex);
if (m_block_queue.empty())
return false;
*pos = m_block_queue.front();
m_block_queue.pop();
m_emerge->popBlockEmergeData(*pos, bedata);
return true;
}
EmergeAction EmergeThread::getBlockOrStartGen(
const v3s16 &pos, bool allow_gen, MapBlock **block, BlockMakeData *bmdata)
{
MutexAutoLock envlock(m_server->m_env_mutex);
// 1). Attempt to fetch block from memory
*block = m_map->getBlockNoCreateNoEx(pos);
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if (*block) {
if ((*block)->isGenerated())
return EMERGE_FROM_MEMORY;
} else {
// 2). Attempt to load block from disk if it was not in the memory
*block = m_map->loadBlock(pos);
if (*block && (*block)->isGenerated())
return EMERGE_FROM_DISK;
}
// 3). Attempt to start generation
if (allow_gen && m_map->initBlockMake(pos, bmdata))
return EMERGE_GENERATED;
// All attempts failed; cancel this block emerge
return EMERGE_CANCELLED;
}
MapBlock *EmergeThread::finishGen(v3s16 pos, BlockMakeData *bmdata,
std::map<v3s16, MapBlock *> *modified_blocks)
{
MutexAutoLock envlock(m_server->m_env_mutex);
ScopeProfiler sp(g_profiler,
"EmergeThread: after Mapgen::makeChunk", SPT_AVG);
/*
Perform post-processing on blocks (invalidate lighting, queue liquid
transforms, etc.) to finish block make
*/
m_map->finishBlockMake(bmdata, modified_blocks);
MapBlock *block = m_map->getBlockNoCreateNoEx(pos);
if (!block) {
errorstream << "EmergeThread::finishGen: Couldn't grab block we "
"just generated: " << PP(pos) << std::endl;
return NULL;
}
v3s16 minp = bmdata->blockpos_min * MAP_BLOCKSIZE;
v3s16 maxp = bmdata->blockpos_max * MAP_BLOCKSIZE +
v3s16(1,1,1) * (MAP_BLOCKSIZE - 1);
// Ignore map edit events, they will not need to be sent
// to anybody because the block hasn't been sent to anybody
MapEditEventAreaIgnorer ign(
&m_server->m_ignore_map_edit_events_area,
VoxelArea(minp, maxp));
/*
Run Lua on_generated callbacks
*/
try {
m_server->getScriptIface()->environment_OnGenerated(
minp, maxp, m_mapgen->blockseed);
} catch (LuaError &e) {
m_server->setAsyncFatalError(e);
}
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EMERGE_DBG_OUT("ended up with: " << analyze_block(block));
/*
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Clear mapgen state
*/
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assert(!m_mapgen->generating);
m_mapgen->gennotify.clearEvents();
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m_mapgen->vm = nullptr;
/*
Activate the block
*/
m_server->m_env->activateBlock(block, 0);
return block;
}
void *EmergeThread::run()
{
BEGIN_DEBUG_EXCEPTION_HANDLER
v3s16 pos;
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std::map<v3s16, MapBlock *> modified_blocks;
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m_map = &m_server->m_env->getServerMap();
m_emerge = m_server->m_emerge;
m_mapgen = m_emerge->m_mapgens[id];
enable_mapgen_debug_info = m_emerge->enable_mapgen_debug_info;
try {
while (!stopRequested()) {
BlockEmergeData bedata;
BlockMakeData bmdata;
EmergeAction action;
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MapBlock *block = nullptr;
if (!popBlockEmerge(&pos, &bedata)) {
m_queue_event.wait();
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continue;
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}
if (blockpos_over_max_limit(pos))
continue;
bool allow_gen = bedata.flags & BLOCK_EMERGE_ALLOW_GEN;
EMERGE_DBG_OUT("pos=" PP(pos) " allow_gen=" << allow_gen);
action = getBlockOrStartGen(pos, allow_gen, &block, &bmdata);
if (action == EMERGE_GENERATED) {
{
ScopeProfiler sp(g_profiler,
"EmergeThread: Mapgen::makeChunk", SPT_AVG);
m_mapgen->makeChunk(&bmdata);
}
block = finishGen(pos, &bmdata, &modified_blocks);
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if (!block)
action = EMERGE_ERRORED;
}
runCompletionCallbacks(pos, action, bedata.callbacks);
if (block)
modified_blocks[pos] = block;
if (!modified_blocks.empty()) {
MapEditEvent event;
event.type = MEET_OTHER;
event.setModifiedBlocks(modified_blocks);
MutexAutoLock envlock(m_server->m_env_mutex);
m_map->dispatchEvent(event);
}
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modified_blocks.clear();
}
} catch (VersionMismatchException &e) {
std::ostringstream err;
err << "World data version mismatch in MapBlock " << PP(pos) << std::endl
<< "----" << std::endl
<< "\"" << e.what() << "\"" << std::endl
<< "See debug.txt." << std::endl
<< "World probably saved by a newer version of " PROJECT_NAME_C "."
<< std::endl;
m_server->setAsyncFatalError(err.str());
} catch (SerializationError &e) {
std::ostringstream err;
err << "Invalid data in MapBlock " << PP(pos) << std::endl
<< "----" << std::endl
<< "\"" << e.what() << "\"" << std::endl
<< "See debug.txt." << std::endl
<< "You can ignore this using [ignore_world_load_errors = true]."
<< std::endl;
m_server->setAsyncFatalError(err.str());
}
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cancelPendingItems();
END_DEBUG_EXCEPTION_HANDLER
return NULL;
}