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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 "cc/throttled_texture_uploader.h"
#include "CCPrioritizedTexture.h"
#include "Extensions3DChromium.h"
#include "TraceEvent.h"
#include "base/metrics/histogram.h"
#include <algorithm>
#include <public/WebGraphicsContext3D.h>
#include <vector>
namespace {
// How many previous uploads to use when predicting future throughput.
static const size_t uploadHistorySize = 100;
// 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_isNonBlocking(false)
{
m_queryId = m_context->createQueryEXT();
}
ThrottledTextureUploader::Query::~Query()
{
m_context->deleteQueryEXT(m_queryId);
}
void ThrottledTextureUploader::Query::begin()
{
m_hasValue = false;
m_isNonBlocking = false;
m_context->beginQueryEXT(Extensions3DChromium::COMMANDS_ISSUED_CHROMIUM, m_queryId);
}
void ThrottledTextureUploader::Query::end()
{
m_context->endQueryEXT(Extensions3DChromium::COMMANDS_ISSUED_CHROMIUM);
}
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;
}
void ThrottledTextureUploader::Query::markAsNonBlocking()
{
m_isNonBlocking = true;
}
bool ThrottledTextureUploader::Query::isNonBlocking()
{
return m_isNonBlocking;
}
ThrottledTextureUploader::ThrottledTextureUploader(WebKit::WebGraphicsContext3D* context)
: m_context(context)
, m_texturesPerSecondHistory(uploadHistorySize, estimatedTexturesPerSecondGlobal)
, m_numBlockingTextureUploads(0)
{
}
ThrottledTextureUploader::~ThrottledTextureUploader()
{
}
size_t ThrottledTextureUploader::numBlockingUploads()
{
processQueries();
return m_numBlockingTextureUploads;
}
void ThrottledTextureUploader::markPendingUploadsAsNonBlocking()
{
for (ScopedPtrDeque<Query>::iterator it = m_pendingQueries.begin();
it != m_pendingQueries.end(); ++it) {
if ((*it)->isNonBlocking())
continue;
m_numBlockingTextureUploads--;
(*it)->markAsNonBlocking();
}
ASSERT(!m_numBlockingTextureUploads);
}
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 / 3];
TRACE_COUNTER1("cc", "estimatedTexturesPerSecond", estimatedTexturesPerSecondGlobal);
return estimatedTexturesPerSecondGlobal;
}
void ThrottledTextureUploader::beginQuery()
{
if (m_availableQueries.isEmpty())
m_availableQueries.append(Query::create(m_context));
m_availableQueries.first()->begin();
}
void ThrottledTextureUploader::endQuery()
{
m_availableQueries.first()->end();
m_pendingQueries.append(m_availableQueries.takeFirst());
m_numBlockingTextureUploads++;
}
void ThrottledTextureUploader::uploadTexture(
CCResourceProvider* resourceProvider,
CCPrioritizedTexture* texture,
const SkBitmap* bitmap,
IntRect content_rect,
IntRect source_rect,
IntSize dest_offset)
{
bool isFullUpload = dest_offset.isZero() &&
source_rect.size() == texture->size();
if (isFullUpload)
beginQuery();
if (bitmap) {
bitmap->lockPixels();
texture->upload(resourceProvider,
static_cast<const uint8_t*>(bitmap->getPixels()),
content_rect,
source_rect,
dest_offset);
bitmap->unlockPixels();
}
if (isFullUpload)
endQuery();
}
void ThrottledTextureUploader::processQueries()
{
while (!m_pendingQueries.isEmpty()) {
if (m_pendingQueries.first()->isPending())
break;
unsigned usElapsed = m_pendingQueries.first()->value();
HISTOGRAM_CUSTOM_COUNTS("Renderer4.TextureGpuUploadTimeUS", usElapsed, 0, 100000, 50);
if (!m_pendingQueries.first()->isNonBlocking())
m_numBlockingTextureUploads--;
// Remove the oldest values from our history and insert the new one
double texturesPerSecond = 1.0 / (usElapsed * 1e-6);
m_texturesPerSecondHistory.pop_back();
m_texturesPerSecondHistory.push_front(texturesPerSecond);
m_availableQueries.append(m_pendingQueries.takeFirst());
}
}
}
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