Implementation of elbow model for the controller position and rotation.

chrome/browser/android/vr_shell/vr_shell_renderer.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_RENDERER_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_RENDERER_H_
 
 #include <memory>
 #include <queue>
 #include <vector>
@@ skipping 134 matching lines @@
   GLuint mid_ring_opacity_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(ReticleRenderer);
 };
 
 class LaserRenderer : public BaseQuadRenderer {
  public:
   LaserRenderer();
   ~LaserRenderer() override;
 
-  void Draw(const gvr::Mat4f& view_proj_matrix);
+  void Draw(float opacity, const gvr::Mat4f& view_proj_matrix);
 
  private:
   GLuint model_view_proj_matrix_handle_;
   GLuint texture_unit_handle_;
   GLuint texture_data_handle_;
   GLuint color_handle_;
   GLuint fade_point_handle_;
   GLuint fade_end_handle_;
+  GLuint opacity_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(LaserRenderer);
 };
 
 class ControllerRenderer : public BaseRenderer {
  public:
   ControllerRenderer();
   ~ControllerRenderer() override;
 
   void SetUp(std::unique_ptr<VrControllerModel> model);
-  void Draw(VrControllerModel::State state, const gvr::Mat4f& view_proj_matrix);
+  void Draw(VrControllerModel::State state,
+            float opacity,
+            const gvr::Mat4f& view_proj_matrix);
   bool IsSetUp() const { return setup_; }
 
  private:
   GLuint model_view_proj_matrix_handle_;
   GLuint tex_uniform_handle_;
+  GLuint opacity_handle_;
   GLuint indices_buffer_ = 0;
   GLuint vertex_buffer_ = 0;
   GLint position_components_ = 0;
   GLenum position_type_ = GL_FLOAT;
   GLsizei position_stride_ = 0;
   const GLvoid* position_offset_ = nullptr;
   GLint tex_coord_components_ = 0;
   GLenum tex_coord_type_ = GL_FLOAT;
   GLsizei tex_coord_stride_ = 0;
   const GLvoid* tex_coord_offset_ = nullptr;
@@ skipping 87 matching lines @@
   std::unique_ptr<ControllerRenderer> controller_renderer_;
   std::unique_ptr<GradientQuadRenderer> gradient_quad_renderer_;
   std::unique_ptr<GradientGridRenderer> gradient_grid_renderer_;
 
   DISALLOW_COPY_AND_ASSIGN(VrShellRenderer);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_RENDERER_H_