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Problems at use | Problèmes à l'utilisation

Subjects Author Language Messages Last message
[Locked] why Open GL?
jesuisbenjamin English 6 fabounet [Read]
21 December 2010 à 16:32

jesuisbenjamin, Saturday 18 December 2010 à 16:21


Subscription date : 28 October 2009
Messages : 415
Hi there,

I implemented cairo on someone else's computer, but it was looking all buggy, background was not nicely cut, there was a wider semi transparent white area behind the dock when hiding etc.
So i tried to run cairo without OpenGL and, lo and behold, it was looking good and running smoothly. On my own computer i now run without openGL and the background looks smoother too and the dock is faster as well. I always assumed openGL offered better quality, but is it the case? What is the difference effectively?

Cheers.
B.

lylambda, Saturday 18 December 2010 à 23:44


Subscription date : 06 September 2009
Messages : 1635
Our dev can explain that better than me, but it's link with the graphical card support. OpenGl use GPU, whereas Cairo use CPU. So, if your graphical card have a good support ( for example a lot of Nvidia), OpenGL was perfect and the CPU arn't used. On the contrary, with my Ati card, the linux support was bad, so there are bugs with OpenGL and I need use cairo backend.

fabounet, Tuesday 21 December 2010 à 10:32


Subscription date : 30 November 2007
Messages : 17118
opengl = harware accelerated.
it's the big hype now, and we were quite pionners on that 2 big advantages: nice 3D animations and effects, and small CPU footprint.
but it all depends on your graphic drivers (ATI has nice 2D support but poor opengl one).
cairo is nice but can be much slower (again, it depends on the 2D drivers, they can be pretty fast sometimes).

jesuisbenjamin, Tuesday 21 December 2010 à 12:12


Subscription date : 28 October 2009
Messages : 415
So having a Dell with an integrated graphics card GM965/GL960 would explain why Cairo is doing better without OpenGL on my computer? (I mean: i don't really have a proper graphic card.)

fabounet, Tuesday 21 December 2010 à 13:28


Subscription date : 30 November 2007
Messages : 17118
on a netbook with an Intel GM450 it works smoothly, so I think it's more a driver problem than a card one.

jesuisbenjamin, Tuesday 21 December 2010 à 13:34


Subscription date : 28 October 2009
Messages : 415
do you have any idea as to how i can find this out? or should i ask that on Ubuntu Forums?

fabounet, Tuesday 21 December 2010 à 16:32


Subscription date : 30 November 2007
Messages : 17118
if you have any rendering problem, you can report it directly to the Mesa team (check with glxinfo if it's a Mesa driver).

Problems at use | Problèmes à l'utilisation

Subjects Author Language Messages Last message
[Locked] why Open GL?
jesuisbenjamin English 6 fabounet [Read]
21 December 2010 à 16:32


Glx-Dock / Cairo-Dock List of forums Problems at use | Problèmes à l'utilisation why Open GL? Top

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