On Wed, 18 Oct 2006, Ramya Segar wrote:

I m a realtive newcomer to linux and device drivers in particular.
I have doubts regrading how to enable double buffering in the fb driver for
amba-clcd.
I m interested in knowing how to enable double bufefring, where two buffers
are allocated and swapped during vertical blanking period (this is how i
understood it).
As I understand it, the dbe extension of XFree86 X server provides software
double buffering, where each window has two buffers, a front and back..
If you can point me to any documentation on this, it would be a great help..

If your graphics engine supports virtual screens and panning, one simple way is
this:
  - Make the virtual vertical resolution (fb_var_screeninfo.yres_virtual) 2
    times the real vertical resolution (fb_var_screeninfo.yres)
  - Use panning to switch from the top (fb_var_screeninfo.yoffset = 0) to the
    bottom (fb_var_screeninfo.yoffset = fb_var_screeninfo.yres) and vice versa

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds

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