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// Copyright 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "config.h"
#include "CCTextureUpdateController.h"
#include "GraphicsContext3D.h"
#include "TextureCopier.h"
#include "TextureUploader.h"
#include <wtf/CurrentTime.h>
namespace {
// Number of textures to update with each call to updateMoreTexturesIfEnoughTimeRemaining().
static const size_t textureUpdatesPerTick = 12;
// Measured in seconds.
static const double textureUpdateTickRate = 0.004;
// Flush interval when performing texture uploads.
static const int textureUploadFlushPeriod = 4;
} // anonymous namespace
namespace WebCore {
size_t CCTextureUpdateController::maxPartialTextureUpdates()
{
return textureUpdatesPerTick;
}
void CCTextureUpdateController::updateTextures(CCResourceProvider* resourceProvider, TextureCopier* copier, TextureUploader* uploader, CCTextureUpdateQueue* queue, size_t count)
{
if (queue->fullUploadSize() || queue->partialUploadSize()) {
if (uploader->isBusy())
return;
uploader->beginUploads();
size_t fullUploadCount = 0;
while (queue->fullUploadSize() && fullUploadCount < count) {
uploader->uploadTexture(resourceProvider, queue->takeFirstFullUpload());
fullUploadCount++;
if (!(fullUploadCount % textureUploadFlushPeriod))
resourceProvider->shallowFlushIfSupported();
}
// Make sure there are no dangling uploads without a flush.
if (fullUploadCount % textureUploadFlushPeriod)
resourceProvider->shallowFlushIfSupported();
bool moreUploads = queue->fullUploadSize();
ASSERT(queue->partialUploadSize() <= count);
// We need another update batch if the number of updates remaining
// in |count| is greater than the remaining partial entries.
if ((count - fullUploadCount) < queue->partialUploadSize())
moreUploads = true;
if (moreUploads) {
uploader->endUploads();
return;
}
size_t partialUploadCount = 0;
while (queue->partialUploadSize()) {
uploader->uploadTexture(resourceProvider, queue->takeFirstPartialUpload());
partialUploadCount++;
if (!(partialUploadCount % textureUploadFlushPeriod))
resourceProvider->shallowFlushIfSupported();
}
// Make sure there are no dangling partial uploads without a flush.
if (partialUploadCount % textureUploadFlushPeriod)
resourceProvider->shallowFlushIfSupported();
uploader->endUploads();
}
size_t copyCount = 0;
while (queue->copySize()) {
copier->copyTexture(queue->takeFirstCopy());
copyCount++;
}
// If we've performed any texture copies, we need to insert a flush here into the compositor context
// before letting the main thread proceed as it may make draw calls to the source texture of one of
// our copy operations.
if (copyCount)
copier->flush();
}
CCTextureUpdateController::CCTextureUpdateController(CCThread* thread, PassOwnPtr<CCTextureUpdateQueue> queue, CCResourceProvider* resourceProvider, TextureCopier* copier, TextureUploader* uploader)
: m_timer(adoptPtr(new CCTimer(thread, this)))
, m_queue(queue)
, m_resourceProvider(resourceProvider)
, m_copier(copier)
, m_uploader(uploader)
, m_monotonicTimeLimit(0)
, m_firstUpdateAttempt(true)
{
}
CCTextureUpdateController::~CCTextureUpdateController()
{
}
bool CCTextureUpdateController::hasMoreUpdates() const
{
return m_queue->hasMoreUpdates();
}
void CCTextureUpdateController::updateMoreTextures(double monotonicTimeLimit)
{
m_monotonicTimeLimit = monotonicTimeLimit;
if (!m_queue->hasMoreUpdates())
return;
// Call updateMoreTexturesNow() directly unless it's the first update
// attempt. This ensures that we empty the update queue in a finite
// amount of time.
if (m_firstUpdateAttempt) {
updateMoreTexturesIfEnoughTimeRemaining();
m_firstUpdateAttempt = false;
} else
updateMoreTexturesNow();
}
void CCTextureUpdateController::onTimerFired()
{
if (!m_queue->hasMoreUpdates())
return;
updateMoreTexturesIfEnoughTimeRemaining();
}
double CCTextureUpdateController::monotonicTimeNow() const
{
return monotonicallyIncreasingTime();
}
double CCTextureUpdateController::updateMoreTexturesTime() const
{
return textureUpdateTickRate;
}
size_t CCTextureUpdateController::updateMoreTexturesSize() const
{
return textureUpdatesPerTick;
}
void CCTextureUpdateController::updateMoreTexturesIfEnoughTimeRemaining()
{
bool hasTimeRemaining = monotonicTimeNow() < m_monotonicTimeLimit - updateMoreTexturesTime();
if (hasTimeRemaining)
updateMoreTexturesNow();
}
void CCTextureUpdateController::updateMoreTexturesNow()
{
m_timer->startOneShot(updateMoreTexturesTime());
updateTextures(m_resourceProvider, m_copier, m_uploader, m_queue.get(), updateMoreTexturesSize());
}
}
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