[PD] playing a video with an offset

[cgc at humboldtblvd.com]

Quoting zmoelnig at iem.at:

> [pix_coordinate] is quite likely to not work
> properly with non-power-of-2 textures.

It does work.  Use 0..height and 0..width instead of the normalized 0..1 
values.  The only limitation lies in the lack of repeat mode for the mapping - 
clamp to edge is the only one supported so far.

cgc


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