dear keith
you reported that ScreenTest crashed when used with "mirrored" displays.
"Mirroring" is apple's term indicating that two displays have the same
global coordinates and thus always show the same thing. You can use the
Monitors control panel to turn mirroring on or off by moving the display
icons to superimpose or not overlap. Mirroring is done rarely with
desktop machines, but is common when using a PowerBook with a large
monitor or projector. However, some PowerBooks (like my G3 Series/250)
simply have a single video device that drives both the screen and the
external video port, whereas others (like your PowerBook/500) have two
devices, one for the screen and one for the video port. In my case
there's only one device, which keeps life simple. In your case, you can
treat them as separate devices, or mirror them.
i tracked down the places where SCREEN choked on mirroring and made quick
fixs to allow things to proceed. ScreenTest now runs to completion.
However, mirroring raises hard-to-solve special cases that I haven't
dealt with properly, so I still suggest turning off mirroring before
running a real experiment.
The changes are described at our web site:
http://color.psych.ucsb.edu/psychtoolbox/mac.html#highlights
I'm enclosing the new versions of SCREEN.mex, ScreenTest.m, and
DescribeComputer.m. Could you try them and confirm that ScreenTest now
runs to completion?
I intend to do a new release this week (if i have time before leaving for
Italy), but it would be nice to know that the fixs work before doing that.
Of course, everyone's welcome to grab these updates and let me know how
they work for you.
best
denis
you reported that ScreenTest crashed when used with "mirrored" displays.
"Mirroring" is apple's term indicating that two displays have the same
global coordinates and thus always show the same thing. You can use the
Monitors control panel to turn mirroring on or off by moving the display
icons to superimpose or not overlap. Mirroring is done rarely with
desktop machines, but is common when using a PowerBook with a large
monitor or projector. However, some PowerBooks (like my G3 Series/250)
simply have a single video device that drives both the screen and the
external video port, whereas others (like your PowerBook/500) have two
devices, one for the screen and one for the video port. In my case
there's only one device, which keeps life simple. In your case, you can
treat them as separate devices, or mirror them.
i tracked down the places where SCREEN choked on mirroring and made quick
fixs to allow things to proceed. ScreenTest now runs to completion.
However, mirroring raises hard-to-solve special cases that I haven't
dealt with properly, so I still suggest turning off mirroring before
running a real experiment.
The changes are described at our web site:
http://color.psych.ucsb.edu/psychtoolbox/mac.html#highlights
I'm enclosing the new versions of SCREEN.mex, ScreenTest.m, and
DescribeComputer.m. Could you try them and confirm that ScreenTest now
runs to completion?
I intend to do a new release this week (if i have time before leaving for
Italy), but it would be nice to know that the fixs work before doing that.
Of course, everyone's welcome to grab these updates and let me know how
they work for you.
best
denis