Re: RGBA to RGB reformatting in pfTexture

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Brian Furtaw (brian++at++hotsauce.clubfed.sgi.com)
Wed, 6 Aug 1997 11:36:25 -0400

Create two different instances of PfTexture on for RGB and one for RGBA then
change the image files as neccessary. Your if could always do a pointer switch
also,

pfTexture *texToUse;

>
> if (RGBA){
> _tex1->setFormat(PFTEX_INTERNAL_FORMAT, PFTEX_RGBA_8);
> _tex1->setImage((unsigned int *)new_buf,4,512,512,1);
        texToUse = _tex1;
> }
> else {
> _tex2->setFormat(PFTEX_INTERNAL_FORMAT,PFTEX_RGB_8);
> _tex2->setImage((unsigned int *)new_buf,3,1024,512,1);
        texToUse = _tex2;
> // NOTICE: different component count and size ^ ^
> }

Brian

On Aug 5, 12:16pm, Frank Dea wrote:
> Subject: RGBA to RGB reformatting in pfTexture
>
> I am having trouble changing the format of a texture after it
> has been used. I have RGBA textures of size 512x512 and RGB textures
> of size 1024x512. I would like to change the pfTexture image buffer,
> size, and format depending on RGB or RGBA image. The following code
> illustrates what I am trying to do.
>
> if (RGBA){
> _tex->setFormat(PFTEX_INTERNAL_FORMAT, PFTEX_RGBA_8);
> _tex->setImage((unsigned int *)new_buf,4,512,512,1);
> }
> else {
> _tex->setFormat(PFTEX_INTERNAL_FORMAT,PFTEX_RGB_8);
> _tex->setImage((unsigned int *)new_buf,3,1024,512,1);
> // NOTICE: different component count and size ^ ^
> }
>
> The above code takes whatever image was originally loaded (RGB or RGBA)
> and sticks with that format, even though I try to change it. Of course,
> deleting the texture and reformating it works, but this is too slow. Is
> there a way to reformat the texture without deleting the pfTexture?
>
>
> Thanks in advance,
>
>
> Frank
>
>
> --
> William Frank Dea
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>
> Research Engineer
> Southwest Research Institute
> (210) 522-6576
>
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>-- End of excerpt from Frank Dea

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Brian Furtaw  (brian++at++sgi.com)	
VisSim  Technical  Consultant
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