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#pragma once
#include <QObject>
#include <QCache>
#include <QMutex>
#include <memory>
class Chunk;
typedef std::shared_ptr<Chunk> ChunkPtr;
class ChunkSource;
/** Caches chunk data for reuse */
class ChunkCache :
public QObject
{
typedef QObject super;
Q_OBJECT
public:
explicit ChunkCache(QObject * parent = NULL);
/** Retrieves the specified chunk from the cache.
Only returns valid chunks; if the chunk is invalid, queues it for rendering and returns an empty ptr. */
ChunkPtr fetch(int a_ChunkX, int a_ChunkZ);
/** 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 chunkAvailable(int a_ChunkX, int a_ChunkZ);
protected slots:
void gotChunk(int a_ChunkX, int a_ChunkZ);
protected:
/** The cache of the chunks */
QCache<quint32, ChunkPtr> m_Cache;
/** Locks te 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 getChunkHash(int a_ChunkX, int a_ChunkZ);
/** Queues the specified chunk for rendering by m_ChunkSource. */
void queueChunkRender(int a_ChunkX, int a_ChunkZ, ChunkPtr & a_Chunk);
};
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