Added WebVR Render path to VrShell

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 <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "third_party/gvr-android-sdk/src/ndk-beta/include/vr/gvr/capi/include/gvr.h"
 #include "third_party/gvr-android-sdk/src/ndk-beta/include/vr/gvr/capi/include/gvr_types.h"
 
 namespace vr_shell {
 
 typedef unsigned int GLuint;
 
 enum ShaderID {
   SHADER_UNRECOGNIZED = 0,
   TEXTURE_QUAD_VERTEX_SHADER,
   TEXTURE_QUAD_FRAGMENT_SHADER,
+  WEBVR_VERTEX_SHADER,
+  WEBVR_FRAGMENT_SHADER,
   SHADER_ID_MAX
 };
 
 class TexturedQuadRenderer {
  public:
   TexturedQuadRenderer();
   ~TexturedQuadRenderer();
 
   // Draw the content rect in the texture quad.
   void Draw(int texture_data_handle, const gvr::Mat4f& combined_matrix);
 
  private:
   GLuint vertex_shader_handle_;
   GLuint fragment_shader_handle_;
   GLuint program_handle_;
   GLuint combined_matrix_handle_;
   GLuint texture_uniform_handle_;
   GLuint position_handle_;
   GLuint texture_coordinate_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(TexturedQuadRenderer);
 };
 
+// Renders a page-generated stereo VR view.
+class WebVrRenderer {
+ public:
+  WebVrRenderer();
+  ~WebVrRenderer();
+
+  void Draw(int texture_handle);
+
+  void UpdateTextureBounds(int eye, const gvr::Rectf& bounds);
+
+ private:
+  static constexpr size_t VERTEX_STRIDE = sizeof(float) * 4;
+  static constexpr size_t POSITION_ELEMENTS = 2;
+  static constexpr size_t TEXCOORD_ELEMENTS = 2;
+  static constexpr size_t POSITION_OFFSET = 0;
+  static constexpr size_t TEXCOORD_OFFSET = sizeof(float) * 2;
+
+  GLuint program_handle_;
+  GLuint tex_uniform_handle_;
+  GLuint src_rect_uniform_handle_;
+  GLuint position_handle_;
+  GLuint texcoord_handle_;
+  GLuint vertex_buffer_;
+
+  gvr::Rectf left_bounds_;
+  gvr::Rectf right_bounds_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebVrRenderer);
+};
+
 class VrShellRenderer {
  public:
   VrShellRenderer();
   ~VrShellRenderer();
 
   TexturedQuadRenderer* GetTexturedQuadRenderer() {
     return textured_quad_renderer_.get();
   }
 
+  WebVrRenderer* GetWebVrRenderer() {
+    return webvr_renderer_.get();
+  }
+
  private:
   std::unique_ptr<TexturedQuadRenderer> textured_quad_renderer_;
+  std::unique_ptr<WebVrRenderer> webvr_renderer_;
   DISALLOW_COPY_AND_ASSIGN(VrShellRenderer);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_RENDERER_H_