diff options
author | Howaner <franzi.moos@googlemail.com> | 2014-11-18 14:56:32 +0100 |
---|---|---|
committer | Howaner <franzi.moos@googlemail.com> | 2014-11-18 14:56:32 +0100 |
commit | 42120e2ea5db0cdb9920ff1c5efef33e0f496d48 (patch) | |
tree | 20ba1ae0a53f757cb8814b6cd6a466fe5acf1308 /Tools/QtBiomeVisualiser/RegionCache.cpp | |
parent | Fixed compile errors. (diff) | |
parent | Merge pull request #1598 from mc-server/SignEditor (diff) | |
download | cuberite-42120e2ea5db0cdb9920ff1c5efef33e0f496d48.tar cuberite-42120e2ea5db0cdb9920ff1c5efef33e0f496d48.tar.gz cuberite-42120e2ea5db0cdb9920ff1c5efef33e0f496d48.tar.bz2 cuberite-42120e2ea5db0cdb9920ff1c5efef33e0f496d48.tar.lz cuberite-42120e2ea5db0cdb9920ff1c5efef33e0f496d48.tar.xz cuberite-42120e2ea5db0cdb9920ff1c5efef33e0f496d48.tar.zst cuberite-42120e2ea5db0cdb9920ff1c5efef33e0f496d48.zip |
Diffstat (limited to '')
-rw-r--r-- | Tools/QtBiomeVisualiser/RegionCache.cpp | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/Tools/QtBiomeVisualiser/RegionCache.cpp b/Tools/QtBiomeVisualiser/RegionCache.cpp new file mode 100644 index 000000000..e46fd222a --- /dev/null +++ b/Tools/QtBiomeVisualiser/RegionCache.cpp @@ -0,0 +1,138 @@ +#include "Globals.h" +#include "RegionCache.h" +#include <QMutexLocker> +#include <QThreadPool> +#include "ChunkSource.h" +#include "RegionLoader.h" +#include "Region.h" + + + + + +RegionCache::RegionCache(QObject * parent) : + super(parent) +{ + m_Cache.setMaxCost(1024 * 1024 * 1024); // 1 GiB of memory for the cache +} + + + + + +RegionPtr RegionCache::fetch(int a_RegionX, int a_RegionZ) +{ + // Retrieve from the cache: + quint32 hash = getRegionHash(a_RegionX, a_RegionZ); + RegionPtr * res; + { + QMutexLocker lock(&m_Mtx); + res = m_Cache[hash]; + // If succesful and region loaded, return the retrieved value: + if ((res != nullptr) && (*res)->isValid()) + { + return *res; + } + } + + // If the region is in cache but not valid, it means it has been already queued for rendering, do nothing now: + if (res != nullptr) + { + return RegionPtr(nullptr); + } + + // There's no such item in the cache, create it now: + try + { + res = new RegionPtr(new Region); + } + catch (const std::bad_alloc &) + { + /* Allocation failed (32-bit process hit the 2 GiB barrier?) + This may happen even with the cache set to 1 GiB, because it contains shared ptrs and so they may be + held by another place in the code even when they are removed from cache. + */ + return RegionPtr(nullptr); + } + if (res == nullptr) + { + return RegionPtr(nullptr); + } + { + QMutexLocker lock(&m_Mtx); + m_Cache.insert(hash, res, sizeof(Region)); + } + + // Queue the region for rendering: + queueRegionRender(a_RegionX, a_RegionZ, *res); + + // Return failure, the region is not yet rendered: + return RegionPtr(nullptr); +} + + + + + +void RegionCache::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 RegionCache::reload() +{ + assert(m_ChunkSource.get() != nullptr); + + // Reload the chunk source: + m_ChunkSource->reload(); + + // Clear the cache: + QMutexLocker lock(&m_Mtx); + m_Cache.clear(); +} + + + + + +void RegionCache::gotRegion(int a_RegionX, int a_RegionZ) +{ + emit regionAvailable(a_RegionX, a_RegionZ); +} + + + + + +quint32 RegionCache::getRegionHash(int a_RegionX, int a_RegionZ) +{ + // 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_RegionX) & 0xffff) << 16) | (static_cast<quint32>(a_RegionZ) & 0xffff)); +} + + + + + +void RegionCache::queueRegionRender(int a_RegionX, int a_RegionZ, RegionPtr & a_Region) +{ + // Create a new loader task: + RegionLoader * loader = new RegionLoader(a_RegionX, a_RegionZ, a_Region, m_ChunkSource); + connect(loader, SIGNAL(loaded(int, int)), this, SLOT(gotRegion(int, int))); + + QThreadPool::globalInstance()->start(loader); +} + + + + |