Re: using the aplpha channel in linux-fb??

[Matthias Clasen <mclasen redhat com>]

Am Dienstag, den 08.03.2005, 11:41 +0100 schrieb Benjamin:
> hi there
> 
> at the moment i am modifying the linux-fb backend to work with an 
> ordinary memory chunk
> to use the rendered data with OpenGL, the purpose of that is to use gtk 
> as a GUI for games.
> 
> It works fine so far, except that the black partions of the screen are 
> fully visible, what is not what i want.
> i want the windows apear above the OpenGL rendered background, the 
> solution seams to be the alpha-
> channel of the off-screen texture, but even though my fb is 32 bit the 
> "aplpha channel" if always zero.
> 
> what i want to know is, how can i force it to be, say 0xff, everywhere a 
> window (or a widget or drawable)
> is drawn and 0x00 everywhere where no window is.
> 

There is already a patch in bugzilla which converts the linux-fb backend
to a generic framebuffer backend with OpenGL support. 

Matthias