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https://github.com/DaedalusX64/daedalus.git
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89 lines
2.5 KiB
C++
89 lines
2.5 KiB
C++
/*
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Copyright (C) 2001 StrmnNrmn
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef HLEGRAPHICS_TEXTURECACHE_H_
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#define HLEGRAPHICS_TEXTURECACHE_H_
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#include "HLEGraphics/CachedTexture.h"
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#include "Base/Singleton.h"
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#include "Utility/RefCounted.h"
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#include "System/Mutex.h"
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#include <vector>
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struct TextureInfo;
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class CTextureCache : public CSingleton< CTextureCache >
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{
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public:
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CTextureCache();
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virtual ~CTextureCache();
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CRefPtr<CNativeTexture> GetOrCreateTexture(const TextureInfo & ti);
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void PurgeOldTextures();
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void DropTextures();
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#ifdef DAEDALUS_DEBUG_DISPLAYLIST
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Mutex * GetDebugMutex() { return &mDebugMutex; }
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struct STextureInfoSnapshot
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{
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STextureInfoSnapshot( const TextureInfo & info, CNativeTexture * texture )
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: Info( info ), Texture( texture )
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{
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}
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TextureInfo Info;
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CRefPtr<CNativeTexture> Texture;
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};
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// You must have a valid lock to call Snapshot.
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void Snapshot(const MutexLock & lock, std::vector< STextureInfoSnapshot > & snapshot) const;
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#else
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// Don't bother locking if we're not debugging.
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Mutex * GetDebugMutex() { return nullptr; }
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#endif
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private:
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CachedTexture * GetOrCreateCachedTexture(const TextureInfo & ti);
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//
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// We implement a 2-way skewed associative cache.
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// Each TextureInfo is hashed using two different methods, to reduce the chance of collisions
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//
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static const u32 HASH_TABLE_BITS = 9;
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static const u32 HASH_TABLE_SIZE = 1<<HASH_TABLE_BITS;
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inline static u32 MakeHashIdxA( const TextureInfo & ti );
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inline static u32 MakeHashIdxB( const TextureInfo & ti );
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// FIXME(strmnnrmn): we should have a struct of TextureInfo+CachedTexture instead -
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// doing binary search on this array needs a memory indirect for every probe.
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using TextureVec = std::vector < CachedTexture * >;
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TextureVec mTextures;
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CachedTexture * mpCacheHashTable[HASH_TABLE_SIZE];
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#ifdef DAEDALUS_DEBUG_DISPLAYLIST
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Mutex mDebugMutex;
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#endif
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};
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#endif // HLEGRAPHICS_TEXTURECACHE_H_
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