multiple textures layering on a single jit.gl.videoplane with blend_enable 1

Hi all , this should be quick and easy.

I already (sort of ) found the solution to my problem,
but I need another method.

The patch will clearly demonstrate that
I want to layer multiple textures to a single jit.gl.videoplane.
it has a red_square frame.png image on top of a "sunset.jpb" image.

My patch will explain it better. But the problem is clearly my lack of understanding
the logics behind merging and layering multiple image inside a single jit.matrix and the use of jit.unpack. OVER using multiple planes layered one on top of another.

Thanks a lot in advance.

phiol