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// Copyright 2015 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 "modules/webgl/WebGLQuery.h"
#include "modules/webgl/WebGL2RenderingContextBase.h"
#include "public/platform/Platform.h"
namespace blink {
WebGLQuery* WebGLQuery::create(WebGL2RenderingContextBase* ctx)
{
return new WebGLQuery(ctx);
}
WebGLQuery::~WebGLQuery()
{
unregisterTaskObserver();
// See the comment in WebGLObject::detachAndDeleteObject().
detachAndDeleteObject();
}
WebGLQuery::WebGLQuery(WebGL2RenderingContextBase* ctx)
: WebGLSharedPlatform3DObject(ctx)
, m_target(0)
, m_taskObserverRegistered(false)
, m_canUpdateAvailability(false)
, m_queryResultAvailable(false)
, m_queryResult(0)
{
setObject(ctx->webContext()->createQueryEXT());
}
void WebGLQuery::setTarget(GLenum target)
{
ASSERT(object());
ASSERT(!m_target);
m_target = target;
}
void WebGLQuery::deleteObjectImpl(WebGraphicsContext3D* context3d)
{
context3d->deleteQueryEXT(m_object);
m_object = 0;
}
void WebGLQuery::resetCachedResult()
{
m_canUpdateAvailability = false;
m_queryResultAvailable = false;
m_queryResult = 0;
// When this is called, the implication is that we should start
// keeping track of whether we can update the cached availability
// and result.
registerTaskObserver();
}
void WebGLQuery::updateCachedResult(WebGraphicsContext3D* ctx)
{
if (m_queryResultAvailable)
return;
if (!m_canUpdateAvailability)
return;
if (!hasTarget())
return;
// We can only update the cached result when control returns to the browser.
m_canUpdateAvailability = false;
GLuint available = 0;
ctx->getQueryObjectuivEXT(object(), GL_QUERY_RESULT_AVAILABLE_EXT, &available);
m_queryResultAvailable = !!available;
if (m_queryResultAvailable) {
GLuint result = 0;
ctx->getQueryObjectuivEXT(object(), GL_QUERY_RESULT_EXT, &result);
m_queryResult = result;
unregisterTaskObserver();
}
}
bool WebGLQuery::isQueryResultAvailable()
{
return m_queryResultAvailable;
}
GLuint WebGLQuery::getQueryResult()
{
return m_queryResult;
}
void WebGLQuery::registerTaskObserver()
{
if (!m_taskObserverRegistered) {
m_taskObserverRegistered = true;
Platform::current()->currentThread()->addTaskObserver(this);
}
}
void WebGLQuery::unregisterTaskObserver()
{
if (m_taskObserverRegistered) {
m_taskObserverRegistered = false;
Platform::current()->currentThread()->removeTaskObserver(this);
}
}
void WebGLQuery::didProcessTask()
{
m_canUpdateAvailability = true;
}
} // namespace blink
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