[Openchrome-users] Accelerated Rotation?

[Thomas Hellström]

Dan Sandberg wrote:

> Which Intel driver?
>
> Interesting idea re: EXA.  I hadn't even heard of it.
>
Hmm. Checking the code it seems that it is currently not possible. The
EXA composite hook does not allow for different orientation of the
source and destination, although most hardware should be able to handle it.

> I'm confused about something.  Is the actual rotation unaccelerated or
> does turning on the rotation disable all other hardware acceleration?
> Because I remember having trouble using OpenGL when the rotation was
> enabled.
>
Yes. It should disable all acceleration.

> Thanks,
>
> -Dan
>
Thomas



> Thomas Hellstr?m wrote:
>
>> Dan Sandberg wrote:
>>
>>  
>>
>>>> No. The OpenChrome driver does not support accelerated rotation at 
>>>> all.
>>>> The CN400 chip has hardware 2D support for accelerated rotation,
>>>> the CLE266 chip can probably do it using the 3D engine, but none of 
>>>>       
>>>
>>> this is supported in the
>>>    
>>>
>>>> driver.
>>>>       
>>>
>>> How difficult would it be to add support for this?
>>>
>>> Thanks,
>>>
>>> -Dan
>>>     
>>
>>
>> It's done in the intel driver, but I've never looked at the code.
>>
>> The 3D api you need to access the texture engines is in via_3d.c.
>> This is probably the slower part but will be compatible with earlier
>> unichromes and unichrome pros that don't have the 2D rotation support.
>>
>> For the (probably faster) 2D engine and Xv rotation support, you need
>> the unichrome pro programming manual from VIA, and probably a good bit
>> of trial-and-error to make it work.
>>
>> It might be possible to have someone extend a compositing manager to use
>> EXA to rotate the screen in a non driver-specific way.  Try and ask on
>> the xorg list. If that's possible, it would be supported in hardware by
>> the openChrome driver.
>>
>> /Thomas
>>
>>
>>
>>
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>>
>>
>>   
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