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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrStencilBuffer.h"
#include "GrContext.h"
#include "GrGpu.h"
#include "GrResourceCache.h"
GR_DEFINE_RESOURCE_CACHE_TYPE(GrStencilBuffer)
void GrStencilBuffer::wasDetachedFromRenderTarget(const GrRenderTarget* rt) {
GrAssert(fRTAttachmentCnt > 0);
if (0 == --fRTAttachmentCnt) {
this->unlockInCache();
// At this point we could be deleted!
}
}
void GrStencilBuffer::transferToCacheAndLock() {
GrAssert(NULL == fCacheEntry);
fCacheEntry =
this->getGpu()->getContext()->addAndLockStencilBuffer(this);
}
void GrStencilBuffer::onRelease() {
// When the GrGpu rips through its list of resources and releases
// them it may release an SB before it releases its attached RTs.
// In that case when GrStencilBuffer sees its last detach it no
// long has a gpu ptr (gets nulled in GrResource::release()) and can't
// access the cache to unlock itself. So if we're being released and still
// have attachments go ahead and unlock now.
if (fRTAttachmentCnt) {
this->unlockInCache();
// we shouldn't be deleted here because some RT still has a ref on us.
}
fCacheEntry = NULL;
}
void GrStencilBuffer::onAbandon() {
// we can use the same behavior as release.
this->onRelease();
}
void GrStencilBuffer::unlockInCache() {
if (NULL != fCacheEntry) {
GrGpu* gpu = this->getGpu();
if (NULL != gpu) {
GrAssert(NULL != gpu->getContext());
gpu->getContext()->unlockStencilBuffer(fCacheEntry);
}
}
}
namespace {
// we should never have more than one stencil buffer with same combo of
// (width,height,samplecount)
void gen_stencil_key_values(int width,
int height,
int sampleCnt,
GrCacheID* cacheID) {
cacheID->fPublicID = GrCacheID::kDefaultPublicCacheID;
cacheID->fResourceSpecific32 = width | (height << 16);
cacheID->fDomain = GrCacheID::kUnrestricted_ResourceDomain;
GrAssert(sampleCnt >= 0 && sampleCnt < 256);
cacheID->fResourceSpecific16 = sampleCnt << 8;
// last 8 bits of 'fResourceSpecific16' is free for flags
}
}
GrResourceKey GrStencilBuffer::ComputeKey(int width,
int height,
int sampleCnt) {
GrCacheID id(GrStencilBuffer::GetResourceType());
gen_stencil_key_values(width, height, sampleCnt, &id);
uint32_t v[4];
id.toRaw(v);
return GrResourceKey(v);
}
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