xf86-video-intel: man/intel.man src/i810_reg.h src/i830_video.c src/i830_video.h

[Barry Scott]

Michel Dänzer wrote:
> On Thu, 2009-03-05 at 21:26 -0800, Haihao Xiang wrote:
>   
>> man/intel.man    |   15 ++++++++
>>  src/i810_reg.h   |    4 ++
>>  src/i830_video.c |  100 ++++++++++++++++++++++++++++++++++++++++++++-----------
>>  src/i830_video.h |    2 +
>>  4 files changed, 102 insertions(+), 19 deletions(-)
>>     
>
> [...]
>
>   
>> +.SS "XV_SYNC_TO_VBLANK"
>> +XV_SYNC_TO_VBLANK is used to control whether textured adapter synchronizes 
>> +the screen update to the vblank to eliminate tearing. It has three 
>> +values 'auto'(-1), 'off'(0) and 'auto'(1). 'off' means never sync, 'on' means 
>> +always sync, no matter what size, and 'auto' means sync if the Xv image is 
>> +more than quarter of the pixels on the screen. The default is 'auto'(-1).
>>     
>
> Rather than syncing to vblank, why don't you define an inclusive
> scanline window using MI_LOAD_SCAN_LINES_INCL and then use an
> MI_WAIT_FOR_EVENT 'Scan Line Window Wait' bit? The radeon driver uses
> that principle, it should make the pipeline stall less when the vertical
> area is smaller and thus remove the need for the 'auto' attribute value.
>
>
>   

Does the INTEL hardware have the ability to do this?

Barry