Re: glCopyPixels and MultiSampling

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From: Angus Dorbie (dorbie++at++sgi.com)
Date: 02/04/2000 13:01:35

This sounds like an OpenGL bug.

The result should be the same, copy should give the antialiased image.

Try several different visuals to see if it affects the behaviour. I saw
a similar thing with blending on a multisample visual once. Chanaging
the visual corrected the problem.

Cheers,ANgus.

Mark Lewis wrote:
>
> Hi Performers,
>
> I am developing a Performer (2.2 / 6.4) application on an Onyx2 IR and
> have a requirement to use glCopyPixels as a post-draw operation in order
> to combine a colour image into a monochrome one and optionally apply
> scale & bias and/or convolution.
>
> I am using a multisample visual, and when I don't do the glCopyPixels
> and view the normal RGB image, it is correctly anti-aliased. But when I
> apply the glCopyPixels operation to convert to monochrome, the image is
> jagged, as if a single-sample rendering had taken place.
>
> My questions are:
>
> 1. Is glCopyPixels compatible with multisample rendering ?
>
> 2. If so, how can I generate an anti-aliased image using glCopyPixels ?
>
> 3. Is there another means by which a monochrome image can be produced,
> with the possibility of using scale, bias & convolution functions in
> real time (30Hz) ?
>
> Thanks in advance to anyone who can offer help on this matter.
>
> --
> Mark C Lewis
>
> Software Development Manager
> Equipe Electronics Ltd.
>
> "Visualising Your Imagination"
>
> Phone +44 (0) 1903 216 622
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>
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>
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-- 
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have taken to raiding 16 year old kids in their bedrooms. Very sad.

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