Re: [info-performer] GL_UNPACK_ALIGNMENT

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From: Paolo Farinelli (paolo++at++sgi.com)
Date: 01/23/2003 17:25:19

Hi Dimi,

You should be able to call glPixelStorei(GL_UNPACK_ALIGNMENT,1)
directly, just before subloading into your texture.

This should work regardless of whether you're subloading using openGL
calls (eg: glCopyTexSubImage2D) or Performer calls (eg:
pfTexture::subload),
as long as you do so from a DRAW process.

It probably is a good idea to restore the original value (should be 4),
after
you are done subloading.

Hope this helps,
Paolo

Dimi wrote:

>Hi,
>is there a way in Performer (to do a
>glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
>
>I need to subload textures which are not byte padded to a 4 word boundary as its probably preset by OpenGL.
>I noticed that if the texture dimensions is not aligned to 4 the subloading does not work right.
>In opengl the above command is used to avoid this.
>
>Thanks in advance
>Dimi
>
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-- 
Paolo Farinelli                                           paolo++at++sgi.com
Member of Technical Staff, OpenGL Performer              1-650-933-1808
Silicon Graphics        1600 Amphitheatre Pkwy, Mountain View, CA 94043

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