[Remoting Android] Cursor & Cursor Feedback for OpenGL Renderer

remoting/client/gl_canvas.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 REMOTING_CLIENT_OPENGL_GL_CANVAS_H_
 #define REMOTING_CLIENT_OPENGL_GL_CANVAS_H_
 
 #include <array>
 
 #include "base/macros.h"
@@ skipping 32 matching lines @@
   // height. m2 and m5 defines the offset of the upper-left corner in percentage
   // of the view's width or height. An identity matrix will stretch the canvas
   // to fit the whole view.
   void SetNormalizedTransformation(const std::array<float, 9>& matrix);
 
   // Draws the texture on the canvas. Nothing will happen if
   // SetNormalizedTransformation() has not been called.
   // vertex_buffer: reference to the 2x4x2 float vertex buffer.
   //                [ four (x, y) normalized vertex positions on the canvas,
   //                  four (x, y) vertex positions to define the visible area ]
-  void DrawTexture(int texture_id, GLuint texture_handle, GLuint vertex_buffer);
+  // alpha_multiplier: Will be multiplied with the alpha channel of the texture.
+  //                   Passing 1 means no change of the transparency of the
+  //                   texture.
+  void DrawTexture(int texture_id,
+                   GLuint texture_handle,
+                   GLuint vertex_buffer,
+                   float alpha_multiplier);
 
   // Returns the version number of current OpenGL ES context. Either 2 or 3.
   int GetGlVersion() const;
 
  private:
   int gl_version_;
 
   // True IFF the transformation has been set.
   bool transformation_set_ = false;
 
   // Handles.
   GLuint vertex_shader_;
   GLuint fragment_shader_;
   GLuint program_;
 
   // Locations of the corresponding shader attributes.
   GLuint transform_location_;
   GLuint texture_location_;
+  GLuint alpha_multiplier_location_;
   GLuint position_location_;
   GLuint tex_cord_location_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(GlCanvas);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CLIENT_OPENGL_GL_CANVAS_H_