[squeak-dev] Re: speeding up copying World using dirty rectangles?

Lawson English lenglish5 at cox.net
Sat Jan 21 19:39:12 UTC 2012

thanks, I'll experiment. Igor's NBOpenGl and GLDisplay would be the best 
route to use for this, but the Mac interface for it doesn't work with 
partial screen areas yet. In the meantime, I get to learn more about 
OpenGL and such.


On 1/21/12 10:19 AM, Marcel Taeumel wrote:
> Hi.
> You should not draw the full scene graph into a buffer that will be copied
> to your OGL stuff in every step/loop. This is slow. You should make use of
> the default world redraw optimization with dirty rectangles. Maybe like
> this:
> 1. Modify WorldState>>displayWorldSafely: to draw into a buffer form and NOT
> into the DisplayScreen.
> 2. Add a postprocessing step to WorldState>>doOneCycleFor: or use #step in a
> Morph (with stepTime == 0) to copy this buffer to your OGL stuff.
> I don't know how specific the form DisplayScreen is. Maybe you can directly
> copy its contents into your OGL world.
> Marcel
> --
> View this message in context: http://forum.world.st/speeding-up-copying-World-using-dirty-rectangles-tp4313876p4316471.html
> Sent from the Squeak - Dev mailing list archive at Nabble.com.

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