mirror of https://github.com/axmolengine/axmol.git
309 lines
8.8 KiB
C++
309 lines
8.8 KiB
C++
/*
|
|
Copyright 2010 Google Inc.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
|
|
#ifndef GrTextureCache_DEFINED
|
|
#define GrTextureCache_DEFINED
|
|
|
|
#include "GrTypes.h"
|
|
#include "GrTHashCache.h"
|
|
|
|
class GrTexture;
|
|
|
|
// return true if a<b, or false if b<a
|
|
//
|
|
#define RET_IF_LT_OR_GT(a, b) \
|
|
do { \
|
|
if ((a) < (b)) { \
|
|
return true; \
|
|
} \
|
|
if ((b) < (a)) { \
|
|
return false; \
|
|
} \
|
|
} while (0)
|
|
|
|
/**
|
|
* Helper class for GrTextureCache, the Key is used to identify src data for
|
|
* a texture. It is identified by 2 32bit data fields which can hold any
|
|
* data (uninterpreted by the cache) and a width/height.
|
|
*/
|
|
class GrTextureKey {
|
|
public:
|
|
enum {
|
|
kHashBits = 7,
|
|
kHashCount = 1 << kHashBits,
|
|
kHashMask = kHashCount - 1
|
|
};
|
|
|
|
GrTextureKey(uint32_t p0, uint32_t p1, uint16_t width, uint16_t height) {
|
|
fP0 = p0;
|
|
fP1 = p1;
|
|
fP2 = width | (height << 16);
|
|
GR_DEBUGCODE(fHashIndex = -1);
|
|
}
|
|
|
|
GrTextureKey(const GrTextureKey& src) {
|
|
fP0 = src.fP0;
|
|
fP1 = src.fP1;
|
|
fP2 = src.fP2;
|
|
finalize(src.fPrivateBits);
|
|
}
|
|
|
|
//!< returns hash value [0..kHashMask] for the key
|
|
int hashIndex() const { return fHashIndex; }
|
|
|
|
friend bool operator==(const GrTextureKey& a, const GrTextureKey& b) {
|
|
GR_DEBUGASSERT(-1 != a.fHashIndex && -1 != b.fHashIndex);
|
|
return a.fP0 == b.fP0 && a.fP1 == b.fP1 && a.fP2 == b.fP2 &&
|
|
a.fPrivateBits == b.fPrivateBits;
|
|
}
|
|
|
|
friend bool operator!=(const GrTextureKey& a, const GrTextureKey& b) {
|
|
GR_DEBUGASSERT(-1 != a.fHashIndex && -1 != b.fHashIndex);
|
|
return !(a == b);
|
|
}
|
|
|
|
friend bool operator<(const GrTextureKey& a, const GrTextureKey& b) {
|
|
RET_IF_LT_OR_GT(a.fP0, b.fP0);
|
|
RET_IF_LT_OR_GT(a.fP1, b.fP1);
|
|
RET_IF_LT_OR_GT(a.fP2, b.fP2);
|
|
return a.fPrivateBits < b.fPrivateBits;
|
|
}
|
|
|
|
private:
|
|
void finalize(uint32_t privateBits) {
|
|
fPrivateBits = privateBits;
|
|
this->computeHashIndex();
|
|
}
|
|
|
|
uint16_t width() const { return fP2 & 0xffff; }
|
|
uint16_t height() const { return (fP2 >> 16); }
|
|
|
|
uint32_t getPrivateBits() const { return fPrivateBits; }
|
|
|
|
static uint32_t rol(uint32_t x) {
|
|
return (x >> 24) | (x << 8);
|
|
}
|
|
static uint32_t ror(uint32_t x) {
|
|
return (x >> 8) | (x << 24);
|
|
}
|
|
static uint32_t rohalf(uint32_t x) {
|
|
return (x >> 16) | (x << 16);
|
|
}
|
|
|
|
void computeHashIndex() {
|
|
uint32_t hash = fP0 ^ rol(fP1) ^ ror(fP2) ^ rohalf(fPrivateBits);
|
|
// this way to mix and reduce hash to its index may have to change
|
|
// depending on how many bits we allocate to the index
|
|
hash ^= hash >> 16;
|
|
hash ^= hash >> 8;
|
|
fHashIndex = hash & kHashMask;
|
|
}
|
|
|
|
uint32_t fP0;
|
|
uint32_t fP1;
|
|
uint32_t fP2;
|
|
uint32_t fPrivateBits;
|
|
|
|
// this is computed from the fP... fields
|
|
int fHashIndex;
|
|
|
|
friend class GrContext;
|
|
};
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
class GrTextureEntry {
|
|
public:
|
|
GrTexture* texture() const { return fTexture; }
|
|
const GrTextureKey& key() const { return fKey; }
|
|
|
|
#if GR_DEBUG
|
|
GrTextureEntry* next() const { return fNext; }
|
|
GrTextureEntry* prev() const { return fPrev; }
|
|
#endif
|
|
|
|
#if GR_DEBUG
|
|
void validate() const;
|
|
#else
|
|
void validate() const {}
|
|
#endif
|
|
|
|
private:
|
|
GrTextureEntry(const GrTextureKey& key, GrTexture* texture);
|
|
~GrTextureEntry();
|
|
|
|
bool isLocked() const { return fLockCount != 0; }
|
|
void lock() { ++fLockCount; }
|
|
void unlock() {
|
|
GrAssert(fLockCount > 0);
|
|
--fLockCount;
|
|
}
|
|
|
|
GrTextureKey fKey;
|
|
GrTexture* fTexture;
|
|
|
|
// track if we're in use, used when we need to purge
|
|
// we only purge unlocked entries
|
|
int fLockCount;
|
|
|
|
// we're a dlinklist
|
|
GrTextureEntry* fPrev;
|
|
GrTextureEntry* fNext;
|
|
|
|
friend class GrTextureCache;
|
|
};
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include "GrTHashCache.h"
|
|
|
|
/**
|
|
* Cache of GrTexture objects.
|
|
*
|
|
* These have a corresponding GrTextureKey, built from 96bits identifying the
|
|
* texture/bitmap.
|
|
*
|
|
* The cache stores the entries in a double-linked list, which is its LRU.
|
|
* When an entry is "locked" (i.e. given to the caller), it is moved to the
|
|
* head of the list. If/when we must purge some of the entries, we walk the
|
|
* list backwards from the tail, since those are the least recently used.
|
|
*
|
|
* For fast searches, we maintain a sorted array (based on the GrTextureKey)
|
|
* which we can bsearch. When a new entry is added, it is inserted into this
|
|
* array.
|
|
*
|
|
* For even faster searches, a hash is computed from the Key. If there is
|
|
* a collision between two keys with the same hash, we fall back on the
|
|
* bsearch, and update the hash to reflect the most recent Key requested.
|
|
*/
|
|
class GrTextureCache {
|
|
public:
|
|
GrTextureCache(int maxCount, size_t maxBytes);
|
|
~GrTextureCache();
|
|
|
|
/**
|
|
* Return the current texture cache limits.
|
|
*
|
|
* @param maxTextures If non-null, returns maximum number of textures that
|
|
* can be held in the cache.
|
|
* @param maxTextureBytes If non-null, returns maximum number of bytes of
|
|
* texture memory that can be held in the cache.
|
|
*/
|
|
void getLimits(int* maxTextures, size_t* maxTextureBytes) const;
|
|
|
|
/**
|
|
* Specify the texture cache limits. If the current cache exceeds either
|
|
* of these, it will be purged (LRU) to keep the cache within these limits.
|
|
*
|
|
* @param maxTextures The maximum number of textures that can be held in
|
|
* the cache.
|
|
* @param maxTextureBytes The maximum number of bytes of texture memory
|
|
* that can be held in the cache.
|
|
*/
|
|
void setLimits(int maxTextures, size_t maxTextureBytes);
|
|
|
|
/**
|
|
* Search for an entry with the same Key. If found, "lock" it and return it.
|
|
* If not found, return null.
|
|
*/
|
|
GrTextureEntry* findAndLock(const GrTextureKey&);
|
|
|
|
/**
|
|
* Create a new entry, based on the specified key and texture, and return
|
|
* its "locked" entry.
|
|
*
|
|
* Ownership of the texture is transferred to the Entry, which will unref()
|
|
* it when we are purged or deleted.
|
|
*/
|
|
GrTextureEntry* createAndLock(const GrTextureKey&, GrTexture*);
|
|
|
|
/**
|
|
* Detach removes an entry from the cache. This prevents the entry from
|
|
* being found by a subsequent findAndLock() until it is reattached. The
|
|
* entry still counts against the cache's budget and should be reattached
|
|
* when exclusive access is no longer needed.
|
|
*/
|
|
void detach(GrTextureEntry*);
|
|
|
|
/**
|
|
* Reattaches a texture to the cache and unlocks it. Allows it to be found
|
|
* by a subsequent findAndLock or be purged (provided its lock count is
|
|
* now 0.)
|
|
*/
|
|
void reattachAndUnlock(GrTextureEntry*);
|
|
|
|
/**
|
|
* When done with an entry, call unlock(entry) on it, which returns it to
|
|
* a purgable state.
|
|
*/
|
|
void unlock(GrTextureEntry*);
|
|
|
|
void removeAll();
|
|
|
|
#if GR_DEBUG
|
|
void validate() const;
|
|
#else
|
|
void validate() const {}
|
|
#endif
|
|
|
|
private:
|
|
void internalDetach(GrTextureEntry*, bool);
|
|
void attachToHead(GrTextureEntry*, bool);
|
|
void purgeAsNeeded(); // uses kFreeTexture_DeleteMode
|
|
|
|
class Key;
|
|
GrTHashTable<GrTextureEntry, Key, 8> fCache;
|
|
|
|
// manage the dlink list
|
|
GrTextureEntry* fHead;
|
|
GrTextureEntry* fTail;
|
|
|
|
// our budget, used in purgeAsNeeded()
|
|
int fMaxCount;
|
|
size_t fMaxBytes;
|
|
|
|
// our current stats, related to our budget
|
|
int fEntryCount;
|
|
size_t fEntryBytes;
|
|
int fClientDetachedCount;
|
|
size_t fClientDetachedBytes;
|
|
};
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
#if GR_DEBUG
|
|
class GrAutoTextureCacheValidate {
|
|
public:
|
|
GrAutoTextureCacheValidate(GrTextureCache* cache) : fCache(cache) {
|
|
cache->validate();
|
|
}
|
|
~GrAutoTextureCacheValidate() {
|
|
fCache->validate();
|
|
}
|
|
private:
|
|
GrTextureCache* fCache;
|
|
};
|
|
#else
|
|
class GrAutoTextureCacheValidate {
|
|
public:
|
|
GrAutoTextureCacheValidate(GrTextureCache*) {}
|
|
};
|
|
#endif
|
|
|
|
#endif
|
|
|