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How to flip/mirror a Jitter matrix?

March 18, 2011 | 11:47 pm

What’s a good way to flip (top to bottom) or mirror (left to right) a Jitter matrix?

I’ve grown used to using OpenGL for display, in which case I use a @scale -1 type construct, but in this particular case I am using all Jitter matrices.

March 19, 2011 | 12:24 am

[jit.dimmap] should do what you need, with combinations of "invert" and "map" commands. the "map" commands will flip the X Y dimensions, so use the [fpsgui] and check the outcoming dimensions to be sure it’s doing what you want.

March 19, 2011 | 6:19 am

FWIW it is also possible to flip a matrix with the srcdimstart, srcdimend and usedstdim attributes (or the destination equivalents). (see Jitter Tutorial 14 for clues)

November 5, 2013 | 12:46 pm

can you flip it in openGL? Some shader maybe?

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