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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/WebGLTimerQueryEXT.h"
#include "core/dom/TaskRunnerHelper.h"
#include "gpu/command_buffer/client/gles2_interface.h"
#include "modules/webgl/WebGLRenderingContextBase.h"
#include "public/platform/Platform.h"
namespace blink {
WebGLTimerQueryEXT* WebGLTimerQueryEXT::create(WebGLRenderingContextBase* ctx) {
return new WebGLTimerQueryEXT(ctx);
}
WebGLTimerQueryEXT::WebGLTimerQueryEXT(WebGLRenderingContextBase* ctx)
: WebGLContextObject(ctx),
m_target(0),
m_queryId(0),
m_canUpdateAvailability(false),
m_queryResultAvailable(false),
m_queryResult(0),
m_taskRunner(TaskRunnerHelper::get(TaskType::Unthrottled,
&ctx->canvas()->document())) {
context()->contextGL()->GenQueriesEXT(1, &m_queryId);
}
WebGLTimerQueryEXT::~WebGLTimerQueryEXT() {
runDestructor();
}
void WebGLTimerQueryEXT::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.
scheduleAllowAvailabilityUpdate();
}
void WebGLTimerQueryEXT::updateCachedResult(gpu::gles2::GLES2Interface* gl) {
if (m_queryResultAvailable)
return;
if (!m_canUpdateAvailability)
return;
if (!hasTarget())
return;
// If this is a timestamp query, set the result to 0 and make it available as
// we don't support timestamps in WebGL due to very poor driver support for
// them.
if (m_target == GL_TIMESTAMP_EXT) {
m_queryResult = 0;
m_queryResultAvailable = true;
return;
}
// We can only update the cached result when control returns to the browser.
m_canUpdateAvailability = false;
GLuint available = 0;
gl->GetQueryObjectuivEXT(object(), GL_QUERY_RESULT_AVAILABLE_EXT, &available);
m_queryResultAvailable = !!available;
if (m_queryResultAvailable) {
GLuint64 result = 0;
gl->GetQueryObjectui64vEXT(object(), GL_QUERY_RESULT_EXT, &result);
m_queryResult = result;
m_taskHandle.cancel();
} else {
scheduleAllowAvailabilityUpdate();
}
}
bool WebGLTimerQueryEXT::isQueryResultAvailable() {
return m_queryResultAvailable;
}
GLuint64 WebGLTimerQueryEXT::getQueryResult() {
return m_queryResult;
}
void WebGLTimerQueryEXT::deleteObjectImpl(gpu::gles2::GLES2Interface* gl) {
gl->DeleteQueriesEXT(1, &m_queryId);
m_queryId = 0;
}
void WebGLTimerQueryEXT::scheduleAllowAvailabilityUpdate() {
if (m_taskHandle.isActive())
return;
m_taskHandle = m_taskRunner->postCancellableTask(
BLINK_FROM_HERE, WTF::bind(&WebGLTimerQueryEXT::allowAvailabilityUpdate,
wrapWeakPersistent(this)));
}
void WebGLTimerQueryEXT::allowAvailabilityUpdate() {
m_canUpdateAvailability = true;
}
} // namespace blink
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