[Chromoting] Implement GlRenderer

remoting/client/gl_math.h

Index: remoting/client/gl_math.h
diff --git a/remoting/client/gl_math.h b/remoting/client/gl_math.h
index 3ea6731f82db464c7334338ca036d8a7f4b6acd0..25481b84e7f3cf4296c88b4b22e6b50168924332 100644
--- a/remoting/client/gl_math.h
+++ b/remoting/client/gl_math.h
@@ -28,6 +28,16 @@ void NormalizeTransformationMatrix(int view_width,
                                    int canvas_height,
                                    std::array<float, 9>* matrix);
 
+// Transposes matrix [ m0 ,0, m2, 0, m4, m5, 0, 0, m8 ]:
+//
+// | m0,  0, m2, |   | x |
+// |  0, m4, m5, | * | y |
+// |  0,  0, m8  |   | 1 |
+//
+// Into [ m0, 0, 0, 0 ,m4, 0, m2, m5, m8 ].
+// The result is only valid if m1=m3=m6=m7=0.

[Sergey Ulanov, 2016/07/27 18:36:41]

Why do you need this requirement?

[Yuwei, 2016/07/27 18:44:01]

If I remove this constraint then I will need to swap everything on different
sides of the diagonal...

That doesn't seem expensive so I think I will just implement this...

[Yuwei, 2016/07/27 18:54:08]

Done.

+void TransposeTransformationMatrix(std::array<float, 9>* matrix);
+
 // Given left, top, width, height of a rectangle, fills |positions| with
 // coordinates of four vertices of the rectangle.
 // positions: [ x_upperleft, y_upperleft, x_lowerleft, y_lowerleft,