dom/canvas/WebGLQuery.h

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef WEBGL_QUERY_H_
   7 #define WEBGL_QUERY_H_
   8
   9 #include "WebGLObjectModel.h"
  10 #include "nsThreadUtils.h"
  11
  12 namespace mozilla {
  13 namespace webgl {
  14 class AvailabilityRunnable;
  15 }  // namespace webgl
  16
  17 class WebGLQuery final : public WebGLContextBoundObject {
  18   friend class webgl::AvailabilityRunnable;
  19
  20   MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(WebGLQuery, override)
  21
  22  public:
  23   const GLuint mGLName;
  24
  25  private:
  26   GLenum mTarget;
  27   RefPtr<WebGLQuery>* mActiveSlot;
  28
  29   bool mCanBeAvailable = false;  // Track whether the event loop has spun
  30
  31   ////
  32  public:
  33   GLenum Target() const { return mTarget; }
  34   bool IsActive() const { return bool(mActiveSlot); }
  35
  36   ////
  37
  38   explicit WebGLQuery(WebGLContext* webgl);
  39
  40  private:
  41   ~WebGLQuery() override;
  42
  43  public:
  44   ////
  45
  46   void BeginQuery(GLenum target, RefPtr<WebGLQuery>& slot);
  47   void EndQuery();
  48   Maybe<double> GetQueryParameter(GLenum pname) const;
  49   void QueryCounter();
  50 };
  51
  52 }  // namespace mozilla
  53
  54 #endif  // WEBGL_QUERY_H_