Re: acceleration

I am not sure your question.  acceleration in gl driver? or acceleration using gl-backend vs. image-backend in cairo?

if you want to use gl backend, create cairo_gl_surface instead of using cairo_image_surface.  Again, the performance of cairo_gl_surface vs. cairo_image_surface depends on your gl driver quality as Chris said.

Henry
________________________________________
From: [email protected] [[email protected]] on behalf of Patrick Shirkey [[email protected]]
Sent: Tuesday, October 02, 2012 3:46 PM
To: [email protected]
Subject: Re: [cairo] acceleration

On Tue, October 2, 2012 9:39 pm, Chris Wilson wrote:
> On Tue, 2 Oct 2012 21:25:43 +1000 (EST), "Patrick Shirkey"
> <[email protected]> wrote:
>>
>> On Tue, October 2, 2012 9:16 pm, Chris Wilson wrote:
>> > On Tue, 2 Oct 2012 15:35:38 +1000 (EST), "Patrick Shirkey"
>> > <[email protected]> wrote:
>> >> Hi,
>> >>
>> >> Is there a simple test to know if cairo is using acceleration or is
>> it
>> >> just a matter of running a desktop with glx?
>> >
>> > Cairo dodges the complicated question of how to setup the rendering
>> > pipeline leaving that to the application/toolkit. So in order for
>> cairo
>> > to use GL, the application must create a set of output Windows
>> > compatible with GL and pass those and the context to cairo to use. The
>> > degree of acceleration then depends upon the quality of the driver and
>> > the style of rendering. In short, do not expect to switching to
>> cairo-gl
>> > to be an easy task to get fast rendering.
>>


In terms of 2d acceleration how would I know if cario is using the GPU or
CPU?




>> Thanks Chris.
>>
>> Is the recommended approached to use cogl directly, cairo or clutter?
>
> Use the appropriate tool to hand :)
>
> Clutter is excellent for controlling animations and emergent behaviour.
> Cairo offers a simple means for describing a page layout (or parts there
> of).
> Cogl aims to make using OpenGL simpler and more portable, with a few
> additional smarts.
>
>> FYI, I am using python3 with gtk3 and so far the only code I have been
>> able to make work with this combination are the clutter examples.
>>
>> I have some existing opengl. I am looking at either porting it to
>> cogl/clutter or if there is a way to load it directly with cairo that I
>> have yet to come across.
>
> If you are starting from OpenGL, probably easier to go to clutter+cogl.
> Cairo comes into its own for having a higher level description of paths
> and shapes, but if you already are well versed in translating into
> OpenGL, then you probably do not need Cairo and will probably be better
> to avoid the impedance mismatch between the PDF rendering model and
> OpenGL. However, if Cairo makes your design and maintenance easier, have
> fun!
> -Chris
>
> --
> Chris Wilson, Intel Open Source Technology Centre
>


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Patrick Shirkey
Boost Hardware Ltd
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