R: [Plib-devel] texture compression

[Paolo L. <p.l...@ci...>]

Sorry, just a question: what about actually loading the DDS texture =
image
data?

I.e. putting a new zsize mode parameter in the glTexImage2D call suppose =
we
are supplying proper pixed data, and, beside the large pixel data block, =
we
should also read w, h, and the GL_COMPRESSED_RGBx_S3TC_DXTx_EXT mode off =
the
file. Is there code for this too?

Greetings -

Paolo Leoncini


> -----Messaggio originale-----
> Da: pli...@li...=20
> [mailto:pli...@li...] Per conto di=20
> Tiago Gusm=E3o
> Inviato: marted=EC 10 gennaio 2006 17.51
> A: pli...@li...
> Oggetto: [Plib-devel] texture compression
>=20
>=20
> Hello
>=20
> I was wondering if i or someone else can add texture=20
> compression support=20
> to plib, which i believe can be done without disrupting the=20
> current plib=20
> behaviour and with few files being affected.
>=20
> Below is my original post to the FlightGear devel list, with a quick=20
> hack patch.
>=20
> Currently we're still discussing this, so no further details,=20
> but if we=20
> go ahead with it, is it alright regarding plib?
>=20
>=20
> Thanks
>=20
> Cheers,
> Tiago
>=20
>=20
> **************************************************************
> *********
> **************************************************************
> *********
> Hello
>=20
> I'm having a HW problem and i can't enable AGP in linux,=20
> which makes the hunter, b1900d and the Nimitz lower FPSs=20
> dramatically, which i believe is caused by the NVRAM filling=20
> up with textures thus forcing texture transfers to the card=20
> (GF4 MX 440 64MB)
>=20
> so after Surge mentioned texture compression, i added it in=20
> plib, with amazing performance improvements in those=20
> situations, It also appears to be improving FPS in general in=20
> other situations.
>=20
> it doesn't check for the extension, **before trying**, check=20
> glxinfo for the presence of "EXT_texture_compression_s3tc"=20
> it's just an ugly hack, works for me and likely everyone else=20
> with s3tc,=20
> but it's bad code, i know,
>=20
> a brief explanation:=20
> http://www.digit-life.com/articles/reviews3tcfxt1/
> spec:=20
> http://oss.sgi.com/projects/ogl-sample/registry/EXT/texture_co
> mpression_s3tc.txt
>=20
>=20
> i have no experience with patches, but here it is, against=20
> plib 1.8.4,for those interested. added one line, made one=20
> token change:
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> diff -cr plib-1.8.4/src/ssg/ssgLoadTexture.cxx
> plib-1.8.4ext/src/ssg/ssgLoadTexture.cxx
> *** plib-1.8.4/src/ssg/ssgLoadTexture.cxx    2003-06-27=20
> 08:15:15.000000000
> +0000
> --- plib-1.8.4ext/src/ssg/ssgLoadTexture.cxx    2006-01-07
> 16:44:17.000000000 +0000
> ***************
> *** 24,29 ****
> --- 24,30 ----
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>    #include "ssgLocal.h"
>=20
> + #define PROXY_TEXTURES_ARE_BROKEN
>=20
>    struct _ssgTextureFormat
>    {
> ***************
> *** 161,167 ****
>        total_texels_loaded +=3D w * h ;
>=20
>        glTexImage2D  ( GL_TEXTURE_2D,
> !                      map_level, zsize, w, h, FALSE /* Border */,
>                                (zsize=3D=3D1)?GL_LUMINANCE:
>                                (zsize=3D=3D2)?GL_LUMINANCE_ALPHA:
>                                (zsize=3D=3D3)?GL_RGB:
> --- 162,168 ----
>        total_texels_loaded +=3D w * h ;
>=20
>        glTexImage2D  ( GL_TEXTURE_2D,
> !                      map_level, /*zsize*/ 0x83F3, w, h, FALSE /*
> Border */,
>                                (zsize=3D=3D1)?GL_LUMINANCE:
>                                (zsize=3D=3D2)?GL_LUMINANCE_ALPHA:
>                                (zsize=3D=3D3)?GL_RGB:
>=20
>=20
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