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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrResourceKey_DEFINED
#define GrResourceKey_DEFINED
#include "GrTypes.h"
#include "GrBinHashKey.h"
class GrResourceKey {
public:
static GrCacheID::Domain ScratchDomain();
/** Uniquely identifies the GrGpuResource subclass in the key to avoid collisions
across resource types. */
typedef uint8_t ResourceType;
/** Flags set by the GrGpuResource subclass. */
typedef uint8_t ResourceFlags;
/** Generate a unique ResourceType */
static ResourceType GenerateResourceType();
/** Creates a key for resource */
GrResourceKey(const GrCacheID& id, ResourceType type, ResourceFlags flags) {
this->init(id.getDomain(), id.getKey(), type, flags);
};
GrResourceKey(const GrResourceKey& src) { fKey = src.fKey; }
GrResourceKey() { fKey.reset(); }
void reset(const GrCacheID& id, ResourceType type, ResourceFlags flags) {
this->init(id.getDomain(), id.getKey(), type, flags);
}
uint32_t getHash() const { return fKey.getHash(); }
bool isScratch() const {
return ScratchDomain() ==
*reinterpret_cast<const GrCacheID::Domain*>(fKey.getData() +
kCacheIDDomainOffset);
}
ResourceType getResourceType() const {
return *reinterpret_cast<const ResourceType*>(fKey.getData() +
kResourceTypeOffset);
}
ResourceFlags getResourceFlags() const {
return *reinterpret_cast<const ResourceFlags*>(fKey.getData() +
kResourceFlagsOffset);
}
bool operator==(const GrResourceKey& other) const { return fKey == other.fKey; }
// A key indicating that the resource is not usable as a scratch resource.
static GrResourceKey& NullScratchKey();
bool isNullScratch() const {
return this->isScratch() && NoneResourceType() == this->getResourceType();
}
private:
enum {
kCacheIDKeyOffset = 0,
kCacheIDDomainOffset = kCacheIDKeyOffset + sizeof(GrCacheID::Key),
kResourceTypeOffset = kCacheIDDomainOffset + sizeof(GrCacheID::Domain),
kResourceFlagsOffset = kResourceTypeOffset + sizeof(ResourceType),
kPadOffset = kResourceFlagsOffset + sizeof(ResourceFlags),
kKeySize = SkAlign4(kPadOffset),
kPadSize = kKeySize - kPadOffset
};
static ResourceType NoneResourceType();
void init(const GrCacheID::Domain domain,
const GrCacheID::Key& key,
ResourceType type,
ResourceFlags flags) {
union {
uint8_t fKey8[kKeySize];
uint32_t fKey32[kKeySize / 4];
} keyData;
uint8_t* k = keyData.fKey8;
memcpy(k + kCacheIDKeyOffset, key.fData8, sizeof(GrCacheID::Key));
memcpy(k + kCacheIDDomainOffset, &domain, sizeof(GrCacheID::Domain));
memcpy(k + kResourceTypeOffset, &type, sizeof(ResourceType));
memcpy(k + kResourceFlagsOffset, &flags, sizeof(ResourceFlags));
memset(k + kPadOffset, 0, kPadSize);
fKey.setKeyData(keyData.fKey32);
}
GrBinHashKey<kKeySize> fKey;
};
#endif
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