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Date: Mon, 27 Jul 2015 10:28:59 +0200 (CEST)
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To: "Gabriel Paubert (paubert AT iram DOT es) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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From: gedau AT igor2 DOT repo DOT hu
Subject: Re: [geda-user] pcb-rnd feature poll: please vote
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Hello,

On Mon, 27 Jul 2015, Gabriel Paubert (paubert AT iram DOT es) [via geda-user AT delorie DOT com] wrote:

>    Hi,
>
> On Mon, Jul 27, 2015 at 08:28:30AM +0200, gedau AT igor2 DOT repo DOT hu wrote:
>> Hi,
>>
>> On Sat, 25 Jul 2015, Kai-Martin Knaak wrote:
>>
>> Opengl and transparent layers was one of my triggers. There were
>> others too, it was more like just the last drop.
>>
>> However, there are many roads:
>>
>> - I am willing to give commit permissions to virtually anyone who
>> wants to contribute (as long as their contribution is aligned with
>> the goals of the project)
>>
>> - I am not against a compile-time option for opengl if someone
>> volunteers to maintain it. I just want the default to be non-opengl,
>> and my main priority is to get things work in the default setup.
>
> So you use Cairo for drawing? What is the performace for large boards
> with 6+ layers and hundreds of components?


I use whatever the gtk hid with gl disabled uses. A quick greb shows cairo 
in one file.

Performance on big designs is probably bad. Haven't measured it so I don't 
have actual data but will do it after work.

However, on boards I typically do, small (30*50 mm, a few ten components) 
or large (~100*50 mm, under a hundred of SMD components), opengl was 
always slower than sw render on all the comptuers I actually use for PCB 
design. I don't think gl would be faster than the sw render on even bigger 
boards on the same machines.

When I do the benchmark, I will also test with the lesstif hid, I have 
some faint memory of it being faster than the gtk HID.

Will publish my results.

Regards,

Igor2