third_party/WebKit/Source/modules/webgl/WebGLQuery.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 WebGLQuery_h
#define WebGLQuery_h

#include "modules/webgl/WebGLSharedPlatform3DObject.h"
#include "platform/WebTaskRunner.h"

namespace gpu {
namespace gles2 {
class GLES2Interface;
}
}

namespace blink {

class WebGL2RenderingContextBase;
class WebTaskRunner;

class WebGLQuery : public WebGLSharedPlatform3DObject {
  DEFINE_WRAPPERTYPEINFO();

 public:
  ~WebGLQuery() override;

  static WebGLQuery* create(WebGL2RenderingContextBase*);

  void setTarget(GLenum);
  bool hasTarget() const { return m_target != 0; }
  GLenum getTarget() const { return m_target; }

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

  bool isQueryResultAvailable();
  GLuint getQueryResult();

 protected:
  explicit WebGLQuery(WebGL2RenderingContextBase*);

  void deleteObjectImpl(gpu::gles2::GLES2Interface*) override;

 private:
  bool isQuery() const override { return true; }

  void scheduleAllowAvailabilityUpdate();
  void allowAvailabilityUpdate();

  GLenum m_target;

  bool m_canUpdateAvailability;
  bool m_queryResultAvailable;
  GLuint m_queryResult;

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

}  // namespace blink

#endif  // WebGLQuery_h