Jon Ashburn <[email protected]> writes:

> I choose a line  primitve since using a 1D texture, but certainly could 
> use a 1D texture on a rectangle.
> If using a rectangle then the test becomes basically window size 
> independent (except likely really tiny windows).
>
> I think if the line were drawn aligned to the viewport axis then it 
> would also make the test independent of window size (except really tiny 
> windows).

Please use a rectangle.  GL lines make testing unreliable.

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