kicad-developers team mailing list archive

[Dick Hollenbeck <dick@...>]

Vesa Solonen wrote:
> Torsten Hüter kirjoitti:
>
>
> > Like Vesa has written Cairo for the Schematics and OpenGL for the PCB.
> > I'll see if I can develop a concept.
>
> Juts to mess this a bit more, I must say that this seemed to be the wise
> decision for gEDA, but I'm not too sure it is good for KiCad. Times are
> changing, etc... Heck, after reading Qt Labs blog I get even more
> doubtful whether the work doing our own OpenGL stack is worth it.
>
> http://labs.trolltech.com/blogs/category/opengl/


It is great that trolltech is posting its findings as it goes. The 
resources they have to do this are now substantial. Even something as 
simple as preparing a graph like this means these folks have time and 
money to pursue answers to questions:


http://labs.trolltech.com/blogs/wp-content/uploads/2010/01/virtual_keyboard_results.png


Much of what you are looking at in that full blog history pertains to 
embedded development, not purely desktop work.

Here is the essence of the QPainter on OpenGL theory:


http://labs.trolltech.com/blogs/2010/01/06/qt-graphics-and-performance-opengl/


The QPainter to OpenGL layer I found last night in a Ubuntu source 
package. 


$ apt-get source libqtgui4


then look at src/opengl directory, and especially: qpaintengine_opengl.cpp


This research is going to take some time, I'm afraid.


Dick



> After Nokia bougt Trolltech with licensing Qt commercial/lgpl/gpl
> everywhere, I can clearly see why everyone seem to be jumping along.
> IMHO they have hit quite a nice compromise that benefits all, but the
> most rigorous purists. The commercial backing enables all kinds of
> uninteresting and boring work to get done, like writing documentation
> and good testing environment (the latter may not me boring though). I'm
> unable comment on implementation details details, but I have (finally)
> learnt that there is nothing perfect (yet;).
>
> Torsten, I hope you can find time to develop Cairo/OpenGL demo soon and
> tip you to take a look at Kicadocaml for ideas. OpenGL trianle strip
> seems to be the most optimised way of painting polygons, but that's
> probably something you already knew.
>
> http://code.google.com/p/kicadocaml/
>
> Regars,
>
> -Vesa