Implementation of elbow model for the controller position and rotation.

chrome/browser/android/vr_shell/vr_shell_gl.h

 // Copyright 2016 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 CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_GL_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_GL_H_
 
 #include <memory>
 #include <queue>
 #include <utility>
@@ skipping 112 matching lines @@
                     const std::vector<const UiElement*>& elements);
   std::vector<const UiElement*> GetElementsInDrawOrder(
       const vr::Mat4f& view_matrix,
       const std::vector<const UiElement*>& elements);
   void DrawCursor(const vr::Mat4f& render_matrix);
   void DrawController(const vr::Mat4f& view_proj_matrix);
   bool ShouldDrawWebVr();
   void DrawWebVr();
   bool WebVrPoseByteIsValid(int pose_index_byte);
 
-  void UpdateController();
-  void HandleControllerInput(const gfx::Vector3dF& forward_vector);
+  void UpdateController(const gfx::Vector3dF& head_direction);
+  void HandleControllerInput(const gfx::Vector3dF& head_direction);
   void HandleControllerAppButtonActivity(
       const gfx::Vector3dF& controller_direction);
   void SendEventsToTarget(InputTarget input_target, int pixel_x, int pixel_y);
   void SendGesture(InputTarget input_target,
                    std::unique_ptr<blink::WebInputEvent> event);
   void CreateUiSurface();
   void OnContentFrameAvailable();
   void OnWebVRFrameAvailable();
   bool GetPixelEncodedFrameIndex(uint16_t* frame_index);
 
@@ skipping 80 matching lines @@
 
   uint8_t frame_index_ = 0;
   // Larger than frame_index_ so it can be initialized out-of-band.
   uint16_t last_frame_index_ = -1;
 
   // Attributes for gesture detection while holding app button.
   gfx::Vector3dF controller_start_direction_;
 
   std::unique_ptr<FPSMeter> fps_meter_;
 
+  gfx::Point3F pointer_start_;
+
   base::WeakPtrFactory<VrShellGl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VrShellGl);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_GL_H_