69 lines
1.4 KiB
C++
69 lines
1.4 KiB
C++
#pragma once
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#include <QObject>
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#include <QCache>
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#include <QMutex>
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class Chunk;
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typedef std::shared_ptr<Chunk> ChunkPtr;
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class ChunkSource;
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/** Caches chunk data for reuse */
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class ChunkCache :
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public QObject
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{
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typedef QObject super;
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Q_OBJECT
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public:
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explicit ChunkCache(QObject * parent = NULL);
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/** Retrieves the specified chunk from the cache.
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Only returns valid chunks; if the chunk is invalid, queues it for rendering and returns an empty ptr. */
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ChunkPtr fetch(int a_ChunkX, int a_ChunkZ);
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/** Replaces the chunk source used by the biome view to get the chunk biome data.
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The cache is then invalidated. */
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void setChunkSource(std::shared_ptr<ChunkSource> a_ChunkSource);
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/** Returns true iff the chunk source has been initialized. */
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bool hasData(void) const { return (m_ChunkSource.get() != nullptr); }
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signals:
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void chunkAvailable(int a_ChunkX, int a_ChunkZ);
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protected slots:
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void gotChunk(int a_ChunkX, int a_ChunkZ);
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protected:
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/** The cache of the chunks */
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QCache<quint32, ChunkPtr> m_Cache;
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/** Locks te cache against multithreaded access */
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QMutex m_Mtx;
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/** The source used to get the biome data. */
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std::shared_ptr<ChunkSource> m_ChunkSource;
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/** Returns the hash used by the chunk in the cache */
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quint32 getChunkHash(int a_ChunkX, int a_ChunkZ);
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/** Queues the specified chunk for rendering by m_ChunkSource. */
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void queueChunkRender(int a_ChunkX, int a_ChunkZ, ChunkPtr & a_Chunk);
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};
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