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#include "Globals.h"
#include "ChunkCache.h"
#include <QMutexLocker>
#include <QThreadPool>
#include "ChunkSource.h"
#include "ChunkLoader.h"
ChunkCache::ChunkCache(QObject * parent) :
super(parent)
{
m_Cache.setMaxCost(1024 * 1024 * 1024); // 1 GiB of memory for the cache
}
ChunkPtr ChunkCache::fetch(int a_ChunkX, int a_ChunkZ)
{
// Retrieve from the cache:
quint32 hash = getChunkHash(a_ChunkX, a_ChunkZ);
ChunkPtr * res;
{
QMutexLocker lock(&m_Mtx);
res = m_Cache[hash];
// If succesful and chunk loaded, return the retrieved value:
if ((res != nullptr) && (*res)->isValid())
{
return *res;
}
}
// If the chunk is in cache but not valid, it means it has been already queued for rendering, do nothing now:
if (res != nullptr)
{
return ChunkPtr(nullptr);
}
// There's no such item in the cache, create it now:
res = new ChunkPtr(new Chunk);
if (res == nullptr)
{
return ChunkPtr(nullptr);
}
{
QMutexLocker lock(&m_Mtx);
m_Cache.insert(hash, res, sizeof(Chunk));
}
// Queue the chunk for rendering:
queueChunkRender(a_ChunkX, a_ChunkZ, *res);
// Return failure, the chunk is not yet rendered:
return ChunkPtr(nullptr);
}
void ChunkCache::setChunkSource(std::shared_ptr<ChunkSource> a_ChunkSource)
{
// Replace the chunk source:
m_ChunkSource = a_ChunkSource;
// Clear the cache:
QMutexLocker lock(&m_Mtx);
m_Cache.clear();
}
void ChunkCache::gotChunk(int a_ChunkX, int a_ChunkZ)
{
emit chunkAvailable(a_ChunkX, a_ChunkZ);
}
quint32 ChunkCache::getChunkHash(int a_ChunkX, int a_ChunkZ)
{
// Simply join the two coords into a single int
// The coords will never be larger than 16-bits, so we can do this safely
return (((static_cast<quint32>(a_ChunkX) & 0xffff) << 16) | (static_cast<quint32>(a_ChunkZ) & 0xffff));
}
void ChunkCache::queueChunkRender(int a_ChunkX, int a_ChunkZ, ChunkPtr & a_Chunk)
{
// Create a new loader task:
ChunkLoader * loader = new ChunkLoader(a_ChunkX, a_ChunkZ, a_Chunk, m_ChunkSource);
connect(loader, SIGNAL(loaded(int, int)), this, SLOT(gotChunk(int, int)));
QThreadPool::globalInstance()->start(loader);
}
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