[info-performer] Re: Clipmapping / Texture substitution

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From: Terry Welsh (mogumbo++at++totalmail.com)
Date: 10/16/2003 09:23:23

Hi Francis,
  The standard example for cliptexturing is at
/usr/share/Performer/src/pguide/libpf/C/cliptex.c, but it's more complicated than it needs to be. Here's some bare-bones sample code you can probably plug into your app pretty easily:

float ctXSize, ctYSize;
ct = pfdLoadClipTexture(ct_filename);
ct->getVirtualSize(&ctXSize, &ctYSize, NULL);

mpct = new pfMPClipTexture;
mpct->setClipTexture(ct);
pfuAddMPClipTextureToPipes(mpct, pfGetPipe(0), NULL);

// prepare geostate that uses this cliptexture
gstate = new pfGeoState;
gstate->setAttr(PFSTATE_TEXTURE, ct);
gstate->setMode(PFSTATE_ENTEXTURE, PF_ON);
gstate->setMode(PFSTATE_ENLIGHTING, PF_ON);

// attach gstate to .flt model
setAllGeoStates((pfGroup*)node, gstate);

void setAllGeoStates(pfGroup* group, pfGeoState* gstate){
        pfGeoSet* gset;

        if(group->isOfType(geode->getType())){
                for(int i=0; i<((pfGeode*)group)->getNumGSets(); i++){
                        gset = ((pfGeode*)group)->getGSet(i);
                        gset->setGState(gstate);
                }
        }
        else{
                for(int i=0; i<group->getNumChildren(); i++)
                        setAllGeoStates((pfGroup*)(group->getChild(i)), gstate);
        }
}

Then somewhere in your main loop you need to set your clipcenter like this:

mpct->setCenter(int(x * ctXSize),
        int(y * ctYSize),
        0);

where x and y are floats from 0.0 to 1.0, I think

Terry Welsh

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