text: //
  // Copyright 2016 Pixar
  //
  // Licensed under the Apache License, Version 2.0 (the "Apache License")
  // with the following modification; you may not use this file except in
  // compliance with the Apache License and the following modification to it:
  // Section 6. Trademarks. is deleted and replaced with:
  //
  // 6. Trademarks. This License does not grant permission to use the trade
  //    names, trademarks, service marks, or product names of the Licensor
  //    and its affiliates, except as required to comply with Section 4(c) of
  //    the License and to reproduce the content of the NOTICE file.
  //
  // You may obtain a copy of the Apache License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the Apache License with the above modification is
  // distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  // KIND, either express or implied. See the Apache License for the specific
  // language governing permissions and limitations under the Apache License.
  //
  #ifndef GARCH_GLDEBUGWINDOW_H
  #define GARCH_GLDEBUGWINDOW_H
  
  #include "pxr/pxr.h"
  #include "pxr/imaging/garch/api.h"
  #include <string>
  
  PXR_NAMESPACE_OPEN_SCOPE
  
  
  class Garch_GLPlatformDebugWindow;
  
  /// \class GarchGLDebugWindow
  ///
  /// Platform specific minimum GL widget for unit tests.
  ///
  class GarchGLDebugWindow {
  public:
      GARCH_API
      GarchGLDebugWindow(const char *title, int width, int height);
      GARCH_API
      virtual ~GarchGLDebugWindow();
  
      GARCH_API
      void Init();
      GARCH_API
      void Run();
      GARCH_API
      void ExitApp();
  
      int GetWidth() const { return _width; }
      int GetHeight() const { return _height; }
  
      enum Buttons {
          MyButton1 = 0,
          MyButton2 = 1,
          MyButton3 = 2
      };
      enum ModifierKeys {
          NoModifiers = 0,
          Shift = 1,
          Alt   = 2,
          Ctrl  = 4
      };
  
      GARCH_API
      virtual void OnInitializeGL();
      GARCH_API
      virtual void OnUninitializeGL();
      GARCH_API
      virtual void OnResize(int w, int h);
      GARCH_API
      virtual void OnIdle();
      GARCH_API
      virtual void OnPaintGL();
      GARCH_API
      virtual void OnKeyRelease(int key);
      GARCH_API
      virtual void OnMousePress(int button, int x, int y, int modKeys);
      GARCH_API
      virtual void OnMouseRelease(int button, int x, int y, int modKeys);
      GARCH_API
      virtual void OnMouseMove(int x, int y, int modKeys);
  
  private:
      Garch_GLPlatformDebugWindow *_private;
      std::string _title;
      int _width, _height;
  };
  
  
  PXR_NAMESPACE_CLOSE_SCOPE
  
  #endif  // GARCH_GLDEBUGWINDOW_H
  