VrShell: implement insecure content warning display

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>
@@ skipping 11 matching lines @@
 enum ShaderID {
   SHADER_UNRECOGNIZED = 0,
   TEXTURE_QUAD_VERTEX_SHADER,
   TEXTURE_QUAD_FRAGMENT_SHADER,
   WEBVR_VERTEX_SHADER,
   WEBVR_FRAGMENT_SHADER,
   RETICLE_VERTEX_SHADER,
   RETICLE_FRAGMENT_SHADER,
   LASER_VERTEX_SHADER,
   LASER_FRAGMENT_SHADER,
+  OVERLAY_ICON_VERTEX_SHADER,
+  OVERLAY_ICON_FRAGMENT_SHADER,
   SHADER_ID_MAX
 };
 
 class BaseRenderer {
  public:
   virtual ~BaseRenderer();
 
  protected:
   BaseRenderer(ShaderID vertex_id, ShaderID fragment_id);
 
@@ skipping 81 matching lines @@
 
   GLuint texture_unit_handle_;
   GLuint texture_data_handle_;
   GLuint color_handle_;
   GLuint fade_point_handle_;
   GLuint fade_end_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(LaserRenderer);
 };
 
+// Renders icons as static overlays.
+enum OverlayIconID {
+  ICON_INSECURE_PERMANENT = 0,
+  ICON_INSECURE_TRANSIENT,
+  ICON_ID_MAX
+};
+
+class OverlayIconRenderer {
+ public:
+  OverlayIconRenderer();
+  ~OverlayIconRenderer();
+
+  void Draw(const gvr::Mat4f& combined_matrix, int icon_num);
+
+ 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 texture_data_handles_[ICON_ID_MAX];
+  GLuint src_rect_uniform_handle_;
+  GLuint position_handle_;
+  GLuint texcoord_handle_;
+  GLuint vertex_buffer_;
+  GLuint combined_matrix_handle_;
+
+  gvr::Rectf bounds_;
+
+  DISALLOW_COPY_AND_ASSIGN(OverlayIconRenderer);
+};
+
 class VrShellRenderer {
  public:
   VrShellRenderer();
   ~VrShellRenderer();
 
   TexturedQuadRenderer* GetTexturedQuadRenderer() {
     return textured_quad_renderer_.get();
   }
 
   WebVrRenderer* GetWebVrRenderer() {
     return webvr_renderer_.get();
   }
 
   ReticleRenderer* GetReticleRenderer() {
     return reticle_renderer_.get();
   }
 
   LaserRenderer* GetLaserRenderer() {
     return laser_renderer_.get();
   }
 
+  OverlayIconRenderer* GetOverlayIconRenderer() {

[bajones, 2016/09/22 22:13:30]

Forgive my ignorance, but it seems like the TexturedQuadRenderer should work
pretty well in this case, given that we're rendering quads with textures on
them? What's the motivation for a new renderer type?

+    return overlay_icon_renderer_.get();
+  }
+
  private:
   std::unique_ptr<TexturedQuadRenderer> textured_quad_renderer_;
   std::unique_ptr<WebVrRenderer> webvr_renderer_;
   std::unique_ptr<ReticleRenderer> reticle_renderer_;
   std::unique_ptr<LaserRenderer> laser_renderer_;
+  std::unique_ptr<OverlayIconRenderer> overlay_icon_renderer_;
 
   DISALLOW_COPY_AND_ASSIGN(VrShellRenderer);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_RENDERER_H_