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#include "Globals.h"
#include "cChunkGenerator.h"
#include "cChunkMap.h"
#include "cChunk.h"
#include "cWorld.h"
#include "cMCLogger.h"
typedef std::pair<int, int> ChunkCoord;
typedef std::list< ChunkCoord > ChunkCoordList;
/// If the generation queue size exceeds this number, a warning will be output
#define QUEUE_WARNING_LIMIT 1000
struct cChunkGenerator::sChunkGeneratorState
{
cCriticalSection m_CriticalSection; // For protecting the variables in this struct
ChunkCoordList GenerateQueue;
ChunkCoord CurrentlyGeneratingCoords;
cChunk* pCurrentlyGenerating;
bool bCurrentlyGenerating;
cSemaphore m_Semaphore;
cThread * pThread;
bool bStop;
sChunkGeneratorState(void)
: m_Semaphore(1, 0)
, pThread( 0 )
, bStop( false )
, bCurrentlyGenerating( false )
, pCurrentlyGenerating( false )
{}
};
cChunkGenerator::cChunkGenerator( cChunkMap* a_pChunkMap )
: m_pState( new sChunkGeneratorState )
, m_pChunkMap( a_pChunkMap )
{
m_pState->pThread = new cThread( GenerateThread, this, "cChunkGenerator::GenerateThread" );
m_pState->pThread->Start( true );
}
cChunkGenerator::~cChunkGenerator()
{
m_pState->bStop = true;
m_pState->m_Semaphore.Signal(); // Signal so thread can continue and exit
delete m_pState->pThread;
delete m_pState;
}
void cChunkGenerator::GenerateChunk( int a_X, int a_Z )
{
cCSLock Lock(&m_pState->m_CriticalSection);
if (m_pState->bCurrentlyGenerating)
{
if ((m_pState->CurrentlyGeneratingCoords.first == a_X) && (m_pState->CurrentlyGeneratingCoords.second == a_Z))
{
return; // Already generating this chunk, so ignore
}
}
m_pState->GenerateQueue.remove( ChunkCoord(a_X, a_Z) );
if (m_pState->GenerateQueue.size() >= QUEUE_WARNING_LIMIT)
{
LOGWARN("WARNING: Adding chunk (%i, %i) to generation queue; Queue is too big! (%i)", a_X, a_Z, m_pState->GenerateQueue.size() );
}
m_pState->GenerateQueue.push_back( ChunkCoord(a_X, a_Z) );
Lock.Unlock();
m_pState->m_Semaphore.Signal();
}
void cChunkGenerator::GenerateThread( void* a_Params )
{
// Cache some values for easy access (they are all references/pointers)
cChunkGenerator * self = (cChunkGenerator*)a_Params;
sChunkGeneratorState * m_pState = self->m_pState;
ChunkCoordList & GenerateQueue = m_pState->GenerateQueue;
cChunkMap & ChunkMap = *self->m_pChunkMap;
cCriticalSection * CriticalSection = &m_pState->m_CriticalSection;
cSemaphore & Semaphore = m_pState->m_Semaphore;
while (!m_pState->bStop)
{
cCSLock Lock(CriticalSection);
if (GenerateQueue.size() == 0)
{
cCSUnlock Unlock(Lock);
Semaphore.Wait();
}
if (m_pState->bStop) break;
ChunkCoord coord = *GenerateQueue.begin(); // Get next coord from queue
GenerateQueue.erase( GenerateQueue.begin() ); // Remove coordinate from queue
m_pState->bCurrentlyGenerating = true;
m_pState->CurrentlyGeneratingCoords = coord;
Lock.Unlock(); // Unlock ASAP
ChunkMap.GetWorld()->LockChunks();
if( ChunkMap.GetChunk( coord.first, 0, coord.second ) ) // Make sure it has not been loaded in the meantime. Don't want to generate the same chunk twice
{ // This is possible when forcing the server to generate a chunk in the main thread
ChunkMap.GetWorld()->UnlockChunks();
continue;
}
ChunkMap.GetWorld()->UnlockChunks();
LOGINFO("cChunkGenerator generating chunk %i %i", coord.first, coord.second );
cChunk* Chunk = new cChunk( coord.first, 0, coord.second, ChunkMap.GetWorld() );
Lock.Lock();
m_pState->pCurrentlyGenerating = Chunk;
Lock.Unlock();
Chunk->Initialize(); // Generate the chunk
ChunkMap.GetWorld()->LockChunks();
ChunkMap.AddChunk( Chunk );
ChunkMap.GetWorld()->UnlockChunks();
Lock.Lock();
m_pState->bCurrentlyGenerating = false;
m_pState->pCurrentlyGenerating = 0;
Lock.Unlock();
} // while (!bStop)
}
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