[Chromoting] Implement GlRenderer

remoting/client/gl_canvas.h

Index: remoting/client/gl_canvas.h
diff --git a/remoting/client/gl_canvas.h b/remoting/client/gl_canvas.h
index 8443f89a6c0568bb9f077a1033eef12432c33658..f6155c53852ef50236deb9071170eeaba303dee2 100644
--- a/remoting/client/gl_canvas.h
+++ b/remoting/client/gl_canvas.h
@@ -30,7 +30,8 @@ class GlCanvas {
 
   // Sets the normalized transformation matrix. This matrix defines how the
   // canvas should be shown on the view.
-  // 3 by 3 transformation matrix, [ m0, m1, m2, m3, m4, m5, m6, m7, m8 ].
+  // 3 by 3 transformation matrix **in column-major order**, i. e.
+  // [ m0, m3, m6, m1, m4, m7, m2, m5, m8 ].

[Sergey Ulanov, 2016/07/27 17:45:33]

This is not intuitive and is hard to work with. Maybe just transpose the matrix
before calling glUniformMatrix3fv()?

[Yuwei, 2016/07/27 18:23:10]

Done. Wrote separate function for matrix transposing.

   // The matrix will be multiplied with the positions (with projective space,
   // (x, y, 1)) to draw the textures with the right zoom and pan configuration.
   //