Re: Rendering for an interlaced display

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Angus Dorbie (angus++at++division.demon.co.uk)
Tue, 7 Feb 1995 13:35:18 +0000

> So, what I would like would be to regard my gl window
> into which the Performer output was rendered as two
> fields, and that I could, when I do a pfDraw call, say
> which field to render. Obviously I would need to have
> a swapbuffer happening before field 1 (fields numbered 1
> and 2) began to render, and hence not after/before each pfDraw.

This should be possible now.
Use defpattern() to define complimentary masks for your interlaced fields
then render alternate fields using setpattern() to select the field you want
to render.

I don't see the point in doing this for real-time output. Your
framebuffer swap would only have to make half the field rate but
your render would have to be double this (as you said). But if you
can render at the field rate you'll output separate frames in each
field anyway.

-- 
 Angus Dorbie                Division Ltd,
 Software Engineer           19 Apex Court,
 Tel: (01454)615554          Woodlands,
 Fax: (01454)615532          Bristol BS12 4JT,
 angus++at++division.demon.co.uk  UK

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