Re: wdisplay pixel format
On Thu, Sep 15, 2011 at 09:20:56PM -0400, Michael wrote: So, most wsdisplay drivers will hand you an 8bit colour-indexed framebuffer, if you get higher colour depth it will be RGB unless you're on a Sun or SGI. Aren't the mmap() details inherently MD anyway? Though we should have some query ioctls to get at least basic infos... Martin
Re: wdisplay pixel format
We do, and that's how the xf86-video-wsfb driver works. I had to fix wsfb driver for 1bpp framebuffer http://mail-index.NetBSD.org/source-changes/2011/07/22/msg024891.html and I still wonder what is a generic format of 4bpp framebuffers that common dix part expects... --- Izumi Tsutsui
Re: wdisplay pixel format
On Fri, Sep 16, 2011 at 08:10:35AM -0400, Michael wrote: We do, and that's how the xf86-video-wsfb driver works. And why does that not include the pixel format? Martin
wdisplay pixel format
I am implementing a device driver using wscons for my display device. Does anyone know how a user land program that opens the device (such as X11) will know what the pixel format will be for the frame buffer? I see there is an ioctl tag WSDISPLAYIO_GTYPE to get display type, WSDISPLAYIO_GINFO to get frame buffer metrics height, width, depth, cmsize, and WSDISPLAYIO_LINEBYTES to get the stride. But how does the program that opens the device know the pixel format? I can seem to find this documented anywhere, nor can I find any code to discern this from. -- Frank Zerangue frank.zeran...@gmail.com
Re: wdisplay pixel format
Hello, On Thu, 15 Sep 2011 19:05:47 -0500 Frank Zerangue frank.zeran...@gmail.com wrote: I am implementing a device driver using wscons for my display device. Does anyone know how a user land program that opens the device (such as X11) will know what the pixel format will be for the frame buffer? I see there is an ioctl tag WSDISPLAYIO_GTYPE to get display type, WSDISPLAYIO_GINFO to get frame buffer metrics height, width, depth, cmsize, and WSDISPLAYIO_LINEBYTES to get the stride. But how does the program that opens the device know the pixel format? You'll have to guess: - anything in 8 bit or less is colour indexed - anything 16 bit is either (extremely likely) RGB565 or (I know of no wsdisplay driver using this format) RGB555 - anything 24 or 32bit is RGB888 or XRGB on most hardware. Exceptions are: - SBus and UPA framebuffers tend to run in XBGR ( AG-10e is an exception but that's really a glint behind and sbus-pci bridge ) - SGI graphics hardware may use RGBX but things are more complicated there anyway, in most cases you won't be able to map the framebuffer anyway or what you'll get may not be linear - some Sun firmware likes to initialize 24bit modes as BGR even on PCI hardware but we run in 8 bit on all of these and you have to jump through some extra hoops to get there So, most wsdisplay drivers will hand you an 8bit colour-indexed framebuffer, if you get higher colour depth it will be RGB unless you're on a Sun or SGI. have fun Michael
