the relationship between PsychToolBox and DirectX

1
Hello all,

I'm using Psychtoolbox 2.54 and Matlab 7, with OS Windows XP
Professional.
I've created an 8 sec movie of a ball moving, by defining each frame
of the movie beforehand, and then running them all together using
Rush.
Here's part of my code:
==================================================

loop = {
'Screen(get(test,''window''),''WaitBlanking'');'
'Screen(get(test,''window''),''WaitBlanking'',prescreens);'

'for i=1:totalFrames;'
'Screen(get(test,''window''),''WaitBlanking'');'
'Screen(get(test,''window''),''FillRect'',background);'
'Screen(get(test,''window''),''FillOval'',stimulusColor
(i),r{i});'
'end;'
};

priorityLevel = MaxPriority(test.screenNumber,'WaitBlanking');
Screen('Screens');
Screen(test.window,'WaitBlanking',prescreens);
Rush(loop,priorityLevel);
============================================================

However at about the 5th trial (=block), the program crushes (not
before the screen and the ball, which were black & white, change
their colors to green and pink...) and the following message appears
on matlab window:

====================================================

??? Error during RUSH: Restore failed to restore the Direct Draw
Surface

Error in ==> Test.presentVisualMovie at 497
Rush(loop,priorityLevel);

Error in ==> Test.EvokeStimulus at 246
presentVisualMovie(test,block,stimulus);

??? Error while evaluating uicontrol Callback.


==========================================================

Does anyone knows what causes the call to Restore method of
directDraw surface?
I know DirectDraw is a java class belongs to DirectX, but I don't
know What are the relations between PsychToolBox and DirectX…

many thanks in advance,
Hanna
2
Hi Mario,
thanks for your fast reply.
I've dowloaded the beta version of PTB as you've suggested,
and the program indeed doesn't crash anymore!
thanks! :)
however, there's a small problem with the new version:
in my program, before running the visual movie, I'm asking matlab to
pause for 10 sec using:

pause(10);

during this time the screen appears with blue color! (although the
background was defined to black)

any suggestions what should I fix here?

many mnay thanks
Hanna





--- In psychtoolbox@yahoogroups.com, "Mario Kleiner"
<mario.kleiner@...> wrote:
>
> Hi Hanna,
>
> the old Windows PTB uses DirectDraw/DirectX for stimulus display. I
> don't know why you experience this error condition, probably a bug
in
> PTB or in DirectX, but in case you get stuck on it, you may want
give
> the beta version of the new OpenGL Psychtoolbox for Windows a try.
It
> contains a compatibility mode that allows to emulate a (small)
subset
> of old PTB's behaviour... It's a new experimental feature but on
the
> code tested so far in our lab, it works reasonably well in most
cases,
> so it may work on your code...
>
> Just follow the instructions in:
>
> <https://lists.berlios.de/pipermail/osxptb-announce/2006-
January/000004.html>
>
> good luck,
> -mario
>
>
> --- In psychtoolbox@yahoogroups.com, "hanna_zahar" <hanna_zahar@>
> wrote:
> >
> > Hello all,
> >
> > I'm using Psychtoolbox 2.54 and Matlab 7, with OS Windows XP
> > Professional.
> > I've created an 8 sec movie of a ball moving, by defining each
frame
> > of the movie beforehand, and then running them all together
using
> > Rush.
> > Here's part of my code:
> > ==================================================
> >
> > loop = {
> > 'Screen(get(test,''window''),''WaitBlanking'');'
> > 'Screen(get
(test,''window''),''WaitBlanking'',prescreens);'
> >
> > 'for i=1:totalFrames;'
> > 'Screen(get(test,''window''),''WaitBlanking'');'
> > 'Screen(get
(test,''window''),''FillRect'',background);'
> > 'Screen(get
(test,''window''),''FillOval'',stimulusColor
> > (i),r{i});'
> > 'end;'
> > };
> >
> > priorityLevel = MaxPriority(test.screenNumber,'WaitBlanking');
> > Screen('Screens');
> > Screen(test.window,'WaitBlanking',prescreens);
> > Rush(loop,priorityLevel);
> > ============================================================
> >
> > However at about the 5th trial (=block), the program crushes
(not
> > before the screen and the ball, which were black & white, change
> > their colors to green and pink...) and the following message
appears
> > on matlab window:
> >
> > ====================================================
> >
> > ??? Error during RUSH: Restore failed to restore the Direct Draw
> > Surface
> >
> > Error in ==> Test.presentVisualMovie at 497
> > Rush(loop,priorityLevel);
> >
> > Error in ==> Test.EvokeStimulus at 246
> > presentVisualMovie(test,block,stimulus);
> >
> > ??? Error while evaluating uicontrol Callback.
> >
> >
> > ==========================================================
> >
> > Does anyone knows what causes the call to Restore method of
> > directDraw surface?
> > I know DirectDraw is a java class belongs to DirectX, but I
don't
> > know What are the relations between PsychToolBox and DirectX…
> >
> > many thanks in advance,
> > Hanna
> >
>