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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 "ThrottledTextureUploader.h"
#include "Extensions3DChromium.h"
#include <algorithm>
#include <public/WebGraphicsContext3D.h>
#include <vector>
namespace {
// Number of pending texture update queries to allow.
static const size_t maxPendingQueries = 2;
// How many previous uploads to use when predicting future throughput.
static const size_t uploadHistorySize = 10;
// Global estimated number of textures per second to maintain estimates across
// subsequent instances of ThrottledTextureUploader.
// More than one thread will not access this variable, so we do not need to synchronize access.
static double estimatedTexturesPerSecondGlobal = 48.0 * 60.0;
} // anonymous namespace
namespace cc {
ThrottledTextureUploader::Query::Query(WebKit::WebGraphicsContext3D* context)
: m_context(context)
, m_queryId(0)
, m_value(0)
, m_hasValue(false)
, m_texturesUploaded(0)
{
m_queryId = m_context->createQueryEXT();
}
ThrottledTextureUploader::Query::~Query()
{
m_context->deleteQueryEXT(m_queryId);
}
void ThrottledTextureUploader::Query::begin()
{
m_hasValue = false;
m_context->beginQueryEXT(Extensions3DChromium::COMMANDS_ISSUED_CHROMIUM, m_queryId);
}
void ThrottledTextureUploader::Query::end(double texturesUploaded)
{
m_context->endQueryEXT(Extensions3DChromium::COMMANDS_ISSUED_CHROMIUM);
m_texturesUploaded = texturesUploaded;
}
bool ThrottledTextureUploader::Query::isPending()
{
unsigned available = 1;
m_context->getQueryObjectuivEXT(m_queryId, Extensions3DChromium::QUERY_RESULT_AVAILABLE_EXT, &available);
return !available;
}
void ThrottledTextureUploader::Query::wait()
{
value();
return;
}
unsigned ThrottledTextureUploader::Query::value()
{
if (!m_hasValue) {
m_context->getQueryObjectuivEXT(m_queryId, Extensions3DChromium::QUERY_RESULT_EXT, &m_value);
m_hasValue = true;
}
return m_value;
}
double ThrottledTextureUploader::Query::texturesUploaded()
{
return m_texturesUploaded;
}
ThrottledTextureUploader::ThrottledTextureUploader(WebKit::WebGraphicsContext3D* context)
: m_context(context)
, m_maxPendingQueries(maxPendingQueries)
, m_texturesPerSecondHistory(uploadHistorySize, estimatedTexturesPerSecondGlobal)
, m_texturesUploaded(0)
{
}
ThrottledTextureUploader::ThrottledTextureUploader(WebKit::WebGraphicsContext3D* context, size_t pendingUploadLimit)
: m_context(context)
, m_maxPendingQueries(pendingUploadLimit)
, m_texturesPerSecondHistory(uploadHistorySize, estimatedTexturesPerSecondGlobal)
, m_texturesUploaded(0)
{
ASSERT(m_context);
}
ThrottledTextureUploader::~ThrottledTextureUploader()
{
}
bool ThrottledTextureUploader::isBusy()
{
processQueries();
if (!m_availableQueries.isEmpty())
return false;
if (m_pendingQueries.size() == m_maxPendingQueries)
return true;
m_availableQueries.append(Query::create(m_context));
return false;
}
double ThrottledTextureUploader::estimatedTexturesPerSecond()
{
processQueries();
// The history should never be empty because we initialize all elements with an estimate.
ASSERT(m_texturesPerSecondHistory.size() == uploadHistorySize);
// Sort the history and use the median as our estimate.
std::vector<double> sortedHistory(m_texturesPerSecondHistory.begin(),
m_texturesPerSecondHistory.end());
std::sort(sortedHistory.begin(), sortedHistory.end());
estimatedTexturesPerSecondGlobal = sortedHistory[sortedHistory.size() / 2];
return estimatedTexturesPerSecondGlobal;
}
void ThrottledTextureUploader::beginUploads()
{
m_texturesUploaded = 0;
// Wait for query to become available.
while (isBusy())
m_pendingQueries.first()->wait();
ASSERT(!m_availableQueries.isEmpty());
m_availableQueries.first()->begin();
}
void ThrottledTextureUploader::endUploads()
{
m_availableQueries.first()->end(m_texturesUploaded);
m_pendingQueries.append(m_availableQueries.takeFirst());
}
void ThrottledTextureUploader::uploadTexture(CCResourceProvider* resourceProvider, Parameters upload)
{
m_texturesUploaded++;
upload.texture->updateRect(resourceProvider, upload.sourceRect, upload.destOffset);
}
void ThrottledTextureUploader::processQueries()
{
while (!m_pendingQueries.isEmpty()) {
if (m_pendingQueries.first()->isPending())
break;
unsigned usElapsed = m_pendingQueries.first()->value();
double texturesPerSecond = m_pendingQueries.first()->texturesUploaded() / (usElapsed * 1e-6);
// Remove the oldest values from our history and insert the new one
m_texturesPerSecondHistory.pop_back();
m_texturesPerSecondHistory.push_front(texturesPerSecond);
m_availableQueries.append(m_pendingQueries.takeFirst());
}
}
}
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