third_party/WebKit/Source/modules/webgl/WebGLTimerQueryEXT.h

// 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.

#ifndef WebGLTimerQueryEXT_h
#define WebGLTimerQueryEXT_h

#include "modules/webgl/WebGLContextObject.h"
#include "platform/WebTaskRunner.h"

namespace gpu {
namespace gles2 {
class GLES2Interface;
}
}

namespace blink {

class WebGLTimerQueryEXT : public WebGLContextObject {
  DEFINE_WRAPPERTYPEINFO();

 public:
  static WebGLTimerQueryEXT* create(WebGLRenderingContextBase*);
  ~WebGLTimerQueryEXT() override;

  void setTarget(GLenum target) { m_target = target; }

  GLuint object() const { return m_queryId; }
  bool hasTarget() const { return m_target != 0; }
  GLenum target() const { return m_target; }

  void resetCachedResult();
  void updateCachedResult(gpu::gles2::GLES2Interface*);

  bool isQueryResultAvailable();
  GLuint64 getQueryResult();

 protected:
  WebGLTimerQueryEXT(WebGLRenderingContextBase*);

 private:
  bool hasObject() const override { return m_queryId != 0; }
  void deleteObjectImpl(gpu::gles2::GLES2Interface*) override;

  void scheduleAllowAvailabilityUpdate();
  void allowAvailabilityUpdate();

  GLenum m_target;
  GLuint m_queryId;

  bool m_canUpdateAvailability;
  bool m_queryResultAvailable;
  GLuint64 m_queryResult;

  std::unique_ptr<WebTaskRunner> m_taskRunner;
  TaskHandle m_taskHandle;
};

}  // namespace blink

#endif  // WebGLTimerQueryEXT_h