I'm wondering whether it's possible to compensate for non-square pixels.
Using vector graphics drawn from OpenGL, in some resolutions my circles
are wider than they are tall, and in other resolutions they are taller
than they are wide. At my LCD's max, native resolution, the circles are
perfect, and to confirm this, the aspect of this max screen resolution
matches the physical measurements of the screen. Other resolutions vary
in aspect ratio from 1.25 up to 1.7, with a corresponding distortion to
the graphics onscreen.
I started out trying to compensate for non-square pixels when running in
lower resolutions , by setting my gluOrtho2D params. I assume that the
max available resolution on a display comprises square pixels, and then
compare the current resolution's aspect ratio to this. This works great,
in both fullscreen and windowed mode.
However, then I switched from Linux to Windows, and on the same
hardware, this time the drivers provide modes which have 'black bars'
down the sides. So the reported resolution does not use the whole screen
real estate. This throws off my 'compenation' calculation, and in fact
pretty much makes it redundant, so I'd like to stop performing this
pixel aspect correction in this case. But I've no idea how to detect
this circumstance from software.
I guess I could have a manual tweak for pixel aspect ratio, that the
user could set. Meh.
I assume automating this can't reliably be done, unless someone has
information to the contrary. Ideas, thoughts, etc, welcome.
Jonathan
--
Jonathan Hartley Made of meat. http://tartley.com
[email protected] +44 7737 062 225 twitter/skype: tartley
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