video textures and Performer 2.0

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Simon Gibbs (Simon.Gibbs++at++gmd.de)
Wed, 6 Mar 1996 14:13:06 +0100 (MET)

I've been working with video textures in Performer 2.0
and have tried the following two approaches:

        IRIS GL
        -------
        pfNewTex, pfTexFormat, ...
        pfGetGLHandle
        subtexload (in draw callback)

        Open GL
        -------
        vTex = pfNewTex(pfGetSharedArena());
        pfTexFilter(vTex, PFTEX_MINFILTER, PFTEX_BILINEAR);
        pfTexFilter(vTex, PFTEX_MAGFILTER, PFTEX_BILINEAR);
        pfTexRepeat(vTex, PFTEX_WRAP, PFTEX_CLAMP);

        pfTexFormat(vTex, PFTEX_INTERNAL_FORMAT, PFTEX_RGB_5);
        pfTexFormat(vTex, PFTEX_SUBLOAD_FORMAT, PF_ON);

        pfTexImage(vTex, NULL, SIR_VEN_16BIT_TEXEL, 1024, 1024, 0);

        pfTexLoadMode(vTex, PFTEX_LOAD_SOURCE, PFTEX_SOURCE_VIDEO);
        pfTexLoadOrigin(vTex, PFTEX_ORIGIN_DEST, 0, 0);
        pfTexLoadSize(vTex, 768, 576); // for CCIR 601 (625)
        pfTexLoadImage(vTex, NULL);

        pfFormatTex(vTex);
        pfLoadTex or pfSubloadTex (in draw callback)

The first works fine, but the second doesn't load (or refresh) the texture.
(The pfTexture man page says "repeated calls to pfLoadTex will
reload the image specified by pfTexLoadImage or the main texture
specified by pfTexImage...").

Any suggestions?

Simon Gibbs
GMD

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