using the aplpha channel in linux-fb??

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.

thanks in advance


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