[info-performer] Blending

From: Christopher Lindinger (Christopher.Lindinger++at++aec.at)
Date: 05/28/2002 08:59:23

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hello pfall, just to confront you with a little problem:

i wanted to make use of the pfGeoState postfuncs to do some
ONE/ONE - blending for texture fading.

this is my postfunc i use for the 2nd pass object:

int my_postfunc_blend_one_one_lequal( pfGeoState * state, void * data )
{
    glBlendFunc( GL_ONE, GL_ONE );
    glDepthFunc( GL_LEQUAL );
}

and this is the setting of the gstates
(transp is 1 for the 2nd pass geometry, 0 otherwise):

             if( transp ){
                 my_gstate->setMode( PFSTATE_TRANSPARENCY, PFTR_BLEND_ALPHA | PFTR_NO_OCCLUDE );
                 my_gstate->setFuncs( (pfGStateFuncType)0, my_postfunc_blend_one_one_lequal, (void *)0 );
             } else {
                 my_gstate->setFuncs( (pfGStateFuncType)0, (pfGStateFuncType)0, (void *)0 );
             }

to ensure that the 2nd pass geometry is drawn second:
             
             if( transp ){
                 gset->setDrawBin(PFSORT_TRANSP_BIN);
             } else {
                 gset->setDrawBin(PFSORT_OPAQUE_BIN);
             }

unfortunately in some viewpositions some faces of the 2nd pass object
are drawn in advance and then overwritten by the non-blended 1st object
(or at least i only see the non blended faces).

any idea what is wrong? or how do i solve this?

thanks
christopher

---
ars electronica futurelab

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