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-rw-r--r--Tools/QtBiomeVisualiser/ChunkCache.cpp110
1 files changed, 110 insertions, 0 deletions
diff --git a/Tools/QtBiomeVisualiser/ChunkCache.cpp b/Tools/QtBiomeVisualiser/ChunkCache.cpp
new file mode 100644
index 000000000..b2230def0
--- /dev/null
+++ b/Tools/QtBiomeVisualiser/ChunkCache.cpp
@@ -0,0 +1,110 @@
+#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);
+}
+
+
+
+