Re: gEDA-user: Garbage drawn outside of pcb board area

["Krzysztof KoÅciuszkiewicz" <k.kosciuszkiewicz@xxxxxxxxx>]

On Sat, Aug 28, 2010 at 04:18:38AM +0100, Peter Clifton wrote:
> On Thu, 2010-06-10 at 00:16 +0200, Krzysztof KoÅciuszkiewicz wrote:
> > On Tue, Jun 08, 2010 at 09:14:12PM +0100, Peter Clifton wrote:
> > 
> > > > You were right - it seems the driver is at fault... It wasn't always
> > > > like that so I'll try to track down what change broke the rendering.
> > > 
> > > It might not be the driver's fault if I'm doing evil things like making
> > > GL calls out of valid context setup. (Which I was).
> > 
> > You were right, I have to retract the statement about the driver's fault.
> > 
> > I got the hint from this FAQ:
> > http://www.opengl.org/resources/faq/technical/clipping.htm#0080
> > 
> > The attached patch fixes the issue for me.
> 
> I finally got a chance to look at this - sorry it took so long!
> 
> I'm not sure it is correct.. the expose event doesn't necessarily cover
> the whole drawing area, so we only actually want to glClear the areas
> being drawn. I still wonder if this relates to a driver bug.
> 
> 
> Perhaps you could try a clean checkout of my latest "before_pours"
> branch (just pushed). I've spent a little time refactoring the code, and
> have put in a few (temporary) hacks to avoid various GL calls which were
> being made out of proper context setup.

I did try the fresh checkout and the annoying effect is now gone.
Good work - thanks!

Best regards,
-- 
Krzysztof KoÅciuszkiewicz
"Simplicity is the ultimate sophistication" -- Leonardo da Vinci


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