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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrResourceAllocator.h"
#include "GrSurfaceProxy.h"
#include "GrSurfaceProxyPriv.h"
void GrResourceAllocator::addInterval(GrSurfaceProxy* proxy,
unsigned int start, unsigned int end) {
SkASSERT(start <= end);
SkASSERT(!fAssigned); // We shouldn't be adding any intervals after (or during) assignment
if (Interval* intvl = fIntvlHash.find(proxy->uniqueID().asUInt())) {
// Revise the interval for an existing use
SkASSERT(intvl->fEnd < start);
intvl->fEnd = end;
return;
}
// TODO: given the usage pattern an arena allocation scheme would work well here
Interval* newIntvl = new Interval(proxy, start, end);
fIntvlList.insertByIncreasingStart(newIntvl);
fIntvlHash.add(newIntvl);
}
GrResourceAllocator::Interval* GrResourceAllocator::IntervalList::popHead() {
Interval* temp = fHead;
if (temp) {
fHead = temp->fNext;
}
return temp;
}
// TODO: fuse this with insertByIncreasingEnd
void GrResourceAllocator::IntervalList::insertByIncreasingStart(Interval* intvl) {
if (!fHead) {
intvl->fNext = nullptr;
fHead = intvl;
} else if (intvl->fStart <= fHead->fStart) {
intvl->fNext = fHead;
fHead = intvl;
} else {
Interval* prev = fHead;
Interval* next = prev->fNext;
for (; next && intvl->fStart > next->fStart; prev = next, next = next->fNext) {
}
intvl->fNext = next;
prev->fNext = intvl;
}
}
// TODO: fuse this with insertByIncreasingStart
void GrResourceAllocator::IntervalList::insertByIncreasingEnd(Interval* intvl) {
if (!fHead) {
intvl->fNext = nullptr;
fHead = intvl;
} else if (intvl->fEnd <= fHead->fEnd) {
intvl->fNext = fHead;
fHead = intvl;
} else {
Interval* prev = fHead;
Interval* next = prev->fNext;
for (; next && intvl->fEnd > next->fEnd; prev = next, next = next->fNext) {
}
intvl->fNext = next;
prev->fNext = intvl;
}
}
// 'surface' can be reused. Add it back to the free pool.
void GrResourceAllocator::freeUpSurface(GrSurface* surface) {
const GrScratchKey &key = surface->resourcePriv().getScratchKey();
if (!key.isValid()) {
return; // can't do it w/o a valid scratch key
}
// TODO: fix this insertion so we get a more LRU-ish behavior
fFreePool.insert(key, surface);
}
// First try to reuse one of the recently allocated/used GrSurfaces in the free pool.
// If we can't find a useable one, create a new one.
// TODO: handle being overbudget
sk_sp<GrSurface> GrResourceAllocator::findSurfaceFor(GrSurfaceProxy* proxy) {
// First look in the free pool
GrScratchKey key;
proxy->priv().computeScratchKey(&key);
GrSurface* surface = fFreePool.find(key);
if (surface) {
return sk_ref_sp(surface);
}
// Failing that, try to grab a new one from the resource cache
return proxy->priv().createSurface(fResourceProvider);
}
// Remove any intervals that end before the current index. Return their GrSurfaces
// to the free pool.
void GrResourceAllocator::expire(unsigned int curIndex) {
while (!fActiveIntvls.empty() && fActiveIntvls.peekHead()->fEnd < curIndex) {
Interval* temp = fActiveIntvls.popHead();
this->freeUpSurface(temp->fProxy->priv().peekSurface());
delete temp;
}
}
void GrResourceAllocator::assign() {
fIntvlHash.reset(); // we don't need this anymore
SkDEBUGCODE(fAssigned = true;)
while (Interval* cur = fIntvlList.popHead()) {
this->expire(cur->fStart);
if (cur->fProxy->priv().isInstantiated()) {
fActiveIntvls.insertByIncreasingEnd(cur);
continue;
}
// TODO: add over budget handling here?
sk_sp<GrSurface> surface = this->findSurfaceFor(cur->fProxy);
if (surface) {
cur->fProxy->priv().assign(std::move(surface));
}
// TODO: handle resouce allocation failure upstack
fActiveIntvls.insertByIncreasingEnd(cur);
}
}
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