Hi Leon, DirectFB is splitted into several pieces.
First there is the system, which is usually responsible for managing the graphical memory (allocate buffers etc...). This is where devmem, fbdev, x11 etc... are standing. Then you have the gfxdrivers, which contains code responsible for hardware acceleration. Systems do not deal directly with hardware acceleration. So you can't talk about "how fbdev implement hw accel", because it's not its job. However, systems have to provide graphical buffers which match the hardware constraints (ie. memory alignment, etc...). In theory any drivers might be able to work on any system, but they're almost all the most tight to a particular system. So the MMIO way might be available for any system (devmem, fbdev, etc...), it all depends on your gfxdriver. Regards, -- Lionel Landwerlin On Wed, Sep 8, 2010 at 10:18 AM, Leon Zhang <linuxzh...@gmail.com> wrote: > Hi, all: > > Could I know how fbdev system mode of DirectFB to implement HW accel. > ? I know in devmem system mode, gfxdriver will config graphic hw > registers by "mmio"(mmap /dev/mem to user space to access HW I/O) to > implement hw acceleration. But how fbdev system mode to implememt hw > accel.? In my understanding, "mmio" way is only available for devmem > system mode. Is my understanding correct? > > Thank you > > > Leon > _______________________________________________ > directfb-dev mailing list > directfb-dev@directfb.org > http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev > _______________________________________________ directfb-dev mailing list directfb-dev@directfb.org http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev
