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#pragma once
#include <QObject>
#include <QCache>
#include <QMutex>
#include <memory>
// fwd:
class Region;
typedef std::shared_ptr<Region> RegionPtr;
class ChunkSource;
/** Caches regions' chunk data for reuse */
class RegionCache :
public QObject
{
typedef QObject super;
Q_OBJECT
public:
explicit RegionCache(QObject * parent = NULL);
/** Retrieves the specified region from the cache.
Only returns valid regions; if the region is invalid, queues it for rendering and returns an empty ptr. */
RegionPtr fetch(int a_RegionX, int a_RegionZ);
/** Replaces the chunk source used by the biome view to get the chunk biome data.
The cache is then invalidated. */
void setChunkSource(std::shared_ptr<ChunkSource> a_ChunkSource);
/** Returns true iff the chunk source has been initialized. */
bool hasData() const { return (m_ChunkSource.get() != nullptr); }
/** Reloads the current chunk source. */
void reload();
signals:
void regionAvailable(int a_RegionX, int a_RegionZ);
protected slots:
void gotRegion(int a_RegionX, int a_RegionZ);
protected:
/** The cache of the chunks */
QCache<quint32, RegionPtr> m_Cache;
/** Locks the cache against multithreaded access */
QMutex m_Mtx;
/** The source used to get the biome data. */
std::shared_ptr<ChunkSource> m_ChunkSource;
/** Returns the hash used by the chunk in the cache */
quint32 getRegionHash(int a_RegionX, int a_RegionZ);
/** Queues the specified region for rendering by m_RegionSource. */
void queueRegionRender(int a_RegionX, int a_RegionZ, RegionPtr & a_Region);
};
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