On Thu, Dec 12, 2002 at 11:16:44PM -0000, Dave Airlie wrote:
>
> Well I asked a question on dri-users and Keith said I'd be better asking
> here ..
> I want to get my OpenGL application to stop flickering on my i815 using a
> sync to the vertical refresh, work has apparently started on this for the
> radeon and g400, so,
>
> a) does someone intend working on the i810 driver?
> b) if !a, where do I start to work on this, I have a development system
> sitting here waiting :-), and I've no fear of X or kernels,
I don't believe that anyone plans to do this. Basically, you need to add
support to the i810 DRM for DRM_IOCTL_WAIT_VBLANK. There are a couple of
places to see how this is used:
lib/GL/mesa/src/drv/mga/mgaioctl.c mgaWaitForVBlank
lib/GL/mesa/src/drv/radeon/radeon_ioctl.c radeonWaitForVBlank
lib/GL/mesa/src/drv/r128/r128_ioctl.c r128WaitForVBlank
programs/Xserver/hw/xfree86/os-support/linux/drm/xf86drm.c drmWaitVBlank
The work will be in setting up the card to send vblank interrupts and
servicint the. I would look at the Radeon driver as a good example of how
to do this:
programs/Xserver/hw/xfree86/os-support/shared/drm/kernel/radeon_irq.c
The i810 driver hasn't been templetized the same was as the Radeon, Rage128,
and G400 drivers, so the code for that driver (for Linux) will live in
programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/i810*
Intel has technical documentation for the i810 & i815 (but not the i830 or
i845) on their website. Go to one of the following and find the link to
either i810 or i815 "GMCH Programmer's Reference Manual."
http://www.intel.com/design/chipsets/manuals/index.htm?iid=PCG+devleftnav&;
It shouldn't matter which you get. Interrupt processing /should/ be the
same for both. The differences between the two chips WRT 3D graphics is
pretty minimal, IIRC.
> Do I need a particular branch of the dri CVS tree or will the HEAD do fine?
> Do I need an updated X11/GL to support the new IOCTL? (am running XFree86
> 4.2.0)
> Can I avoid downloading/building the Xserver, just grab the DRI stuff?
Follow the instructions on the DRI compilation guide.
> Will this be in 4.3 (I have to do a product and a stable release looks
> better to management!).
At this point, there's pretty much no chance of that.
--
Smile! http://antwrp.gsfc.nasa.gov/apod/ap990315.html
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