Re: [info-performer] Preventing texture sharing among pfTextures with the same image

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From: Yair Kurzion (yair++at++polygon.engr.sgi.com)
Date: 05/20/2003 19:00:44

Hi Devrim !

Try:
    pfdConverterMode_pfb(PFPFB_SHARE_GS_OBJECTS, PF_OFF).

This should turn off sharing of all objects, including textures.
The PFB loader doesn't have a texture-only sharing flag.

> I have noticed that if a pfb contains several pfTexture objects which
> use the same image file but differ in other texture properties such as
> texture repeat and filter, perfly loads only one image file. However to
> my understanding although these pfTextures are not identical except the
> image they contain, these pfTextures are shared.

The PFB loader source checks for all the different attributes of a texture.
It shares textures only if they are identical (including their wrapping
attributes). Are you sure that your PFB file contains two separate textures ?

> A simple example is when 4 polygons exist in the database and each of
> them have the same texture image but with different texture repeat
> settings. In perfly they all look the same.

Sounds like all your polygons share a single pfTexture.

> Is this a bug or a feature which I can tweak ?

Performer ships with the source to the PFB loader. It's under:

    /usr/share/Performer/src/lib/libpfdb/libpfpfb/

So, it's easy to check what it does.

-yair 

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