[cairo] Cairo backend which utilizes GPU

[KwangYul Seo]

Hello.

Thanks for your opinion, kammal. You mentioned that OpenVG on top of OpenGL
ES 1.1 is not very interesting. What do you mean by this? You mean the
performance of OpenVG on top of OpenGL ES 1.1 is not so good?

I think the only option I have at this moment is to use OpenVG
implementation on top of OpenGL ES 1.1 because currently OpenVG hardwares
are rare in the market. If the performance is not so impressive, I may need
to find another solutions.

By the way, what is the most general approach to use accelerated 2D vector
graphics in mobile devices?

Regards,
Kwang Yul Seo


On Thu, Jul 3, 2008 at 9:59 AM, kammal <kamalneet at gmail.com> wrote:

> On Wed, Jul 2, 2008 at 12:04 PM, KwangYul Seo <kwangyul.seo at gmail.com>
> wrote:
>
>> Hi,
>>
>> I want to use cairo in embedded systems with OpenGL ES support. I know
>> currently there are two cairo backends which uses GPU for graphics
>> acceleration.
>>
>> 1) Glitz (OpenGL backend)
>> 2) OpenVG (which is usually implemented in OpenGL)
>>
>> Can I use Glitz for this purpose? I am a bit worried because glitz seems
>> to be out of date now. What is the minimum requirements of OpenGL to use
>> glitz? Does it need specific GL extensions?
>
>
> We found it difficult to port glitz to OpenGL ES 1.1. It is dependent on
> some functions e.g. glMapBuffer, which are not present in OpenGL ES. The
> code is not so simple, perhaps because it has to work with the diversity of
> GL implementations on desktop. That is an amazing feat, but perhaps not the
> best solution for embedded...
> I don't remember exactly, but it should need either FBO, or pbuffers with
> bind-to-texture support (otherwise rendering trapezoids should be very
> slow). Don't know how well it works with egl's pbuffers..
>
> OpenVG is a very good choice, *if* we have hardware+drivers that run OpenVG
> fast. And having a full OpenVG on top of OpenGL ES 1.1 is not very
> interesting.
>
>
>> What is the current status of OpenVG backend? Is it an officially
>> supported backend? I found AmanithVG implements OpenVG with OpenGL ES 1.1
>> and 2.0.
>
>
>>
>> Are there other options to use cairo in embedded systems with
>> accleration?
>
>
> If you use X, you can add Render acceleration in xserver, and just use the
> xrender backend.
>
> ~kammal
>
>>
>>
>> Regards,
>> Kwang Yul Seo
>>
>>
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>> cairo at cairographics.org
>> http://lists.cairographics.org/mailman/listinfo/cairo
>>
>
>
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