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gwlarson |
3.1 |
/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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/* |
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* Routines for Radiance -> OpenGL materials. |
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*/ |
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#include "radogl.h" |
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extern int free(), freemtl(); |
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int domats = 1; /* are we doing materials? */ |
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LUTAB mtab = LU_SINIT(free,freemtl); |
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rgl_matclear() /* clean up materials */ |
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{ |
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lu_done(&mtab); |
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domats = 1; |
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} |
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MATREC * |
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getmatp(nam) /* find material record for modifier name */ |
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char *nam; |
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{ |
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register LUENT *lup; |
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if (nam == NULL) |
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return(NULL); |
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if ((lup = lu_find(&mtab, nam)) == NULL) |
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return(NULL); |
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return((MATREC *)lup->data); |
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} |
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o_default(o) /* default object is non-material modifier */ |
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register OBJREC *o; |
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{ |
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register LUENT *lup; |
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#ifdef DEBUG |
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if (o->otype >= 0 && !ismodifier(o->otype)) |
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error(CONSISTENCY, "o_default handed non-modifier"); |
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#endif |
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/* find name in lookup table */ |
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if ((lup = lu_find(&mtab, o->oname)) == NULL) |
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goto memerr; |
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if (lup->key == NULL) { /* new entry? */ |
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lup->key = (char *)malloc(strlen(o->oname)+1); |
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if (lup->key == NULL) |
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goto memerr; |
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strcpy(lup->key, o->oname); |
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} else if (lup->data != NULL) |
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freemtl(lup->data); |
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if ((lup->data = o->os) != NULL) /* make material reference */ |
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((MATREC *)lup->data)->nlinks++; |
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return; |
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memerr: |
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error(SYSTEM, "out of memory in o_default"); |
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} |
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MATREC * |
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newmaterial(nam) /* get an entry for a new material */ |
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char *nam; |
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{ |
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register LUENT *lup; |
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/* look it up (assign entry) */ |
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if ((lup = lu_find(&mtab, nam)) == NULL) |
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goto memerr; |
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if (lup->key == NULL) { /* new entry? */ |
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lup->key = (char *)malloc(strlen(nam)+1); |
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if (lup->key == NULL) |
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goto memerr; |
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strcpy(lup->key, nam); |
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} else if (lup->data != NULL) |
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freemtl(lup->data); |
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lup->data = (char *)malloc(sizeof(MATREC)); |
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if (lup->data == NULL) |
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goto memerr; |
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((MATREC *)lup->data)->nlinks = 1; |
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return((MATREC *)lup->data); |
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memerr: |
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error(SYSTEM, "out of memory in newmaterial"); |
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} |
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freemtl(mp) /* free a material */ |
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register MATREC *mp; |
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{ |
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if (!--mp->nlinks) |
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free((char *)mp); |
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} |
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m_normal(o) /* compute normal material parameters */ |
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register OBJREC *o; |
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{ |
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register MATREC *m; |
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/* check arguments */ |
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if (o->oargs.nfargs != (o->otype == MAT_TRANS ? 7 : 5)) |
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objerror(o, USER, "bad # of real arguments"); |
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/* allocate/insert material */ |
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m = newmaterial(o->oname); |
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/* assign parameters */ |
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setcolor(m->u.m.ambdiff, o->oargs.farg[0], |
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o->oargs.farg[1], o->oargs.farg[2]); |
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if ((m->type = o->otype) == MAT_METAL) |
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copycolor(m->u.m.specular, m->u.m.ambdiff); |
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else |
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setcolor(m->u.m.specular, 1., 1., 1.); |
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scalecolor(m->u.m.specular, o->oargs.farg[3]); |
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scalecolor(m->u.m.ambdiff, 1.-o->oargs.farg[3]); |
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if (m->type == MAT_TRANS) { |
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scalecolor(m->u.m.specular, 1.-o->oargs.farg[5]); |
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scalecolor(m->u.m.ambdiff, 1.-o->oargs.farg[5]); |
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} |
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if (o->oargs.farg[4] <= FTINY) |
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m->u.m.specexp = MAXSPECEXP; |
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else |
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m->u.m.specexp = 2./(o->oargs.farg[4]*o->oargs.farg[4]); |
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if (m->u.m.specexp > MAXSPECEXP) |
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m->u.m.specexp = MAXSPECEXP; |
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} |
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m_aniso(o) /* anisotropic material */ |
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register OBJREC *o; |
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{ |
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register MATREC *m; |
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/* check arguments */ |
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if (o->oargs.nfargs < (o->otype == MAT_TRANS2 ? 8 : 6)) |
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objerror(o, USER, "bad # of real arguments"); |
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/* allocate/insert material */ |
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m = newmaterial(o->oname); |
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/* assign parameters */ |
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setcolor(m->u.m.ambdiff, o->oargs.farg[0], |
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o->oargs.farg[1], o->oargs.farg[2]); |
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if ((m->type = o->otype) == MAT_METAL2) |
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copycolor(m->u.m.specular, m->u.m.ambdiff); |
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else |
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setcolor(m->u.m.specular, 1., 1., 1.); |
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scalecolor(m->u.m.specular, o->oargs.farg[3]); |
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scalecolor(m->u.m.ambdiff, 1.-o->oargs.farg[3]); |
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if (m->type == MAT_TRANS2) { |
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scalecolor(m->u.m.specular, 1.-o->oargs.farg[6]); |
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scalecolor(m->u.m.ambdiff, 1.-o->oargs.farg[6]); |
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} |
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if (o->oargs.farg[4]*o->oargs.farg[5] <= FTINY*FTINY) |
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m->u.m.specexp = MAXSPECEXP; |
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else |
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m->u.m.specexp = 2./(o->oargs.farg[4]*o->oargs.farg[5]); |
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if (m->u.m.specexp > MAXSPECEXP) |
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m->u.m.specexp = MAXSPECEXP; |
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} |
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m_glass(o) /* glass material (hopeless) */ |
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OBJREC *o; |
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{ |
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register MATREC *m; |
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m = newmaterial(o->oname); |
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m->type = o->otype; |
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setcolor(m->u.m.ambdiff, 0., 0., 0.); |
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setcolor(m->u.m.specular, .08, .08, .08); |
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m->u.m.specexp = MAXSPECEXP; |
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} |
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m_brdf(o) /* convert functional material */ |
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register OBJREC *o; |
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{ |
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register MATREC *m; |
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/* check arguments */ |
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if (o->oargs.nfargs < (o->otype == MAT_TFUNC ? 6 : 4)) |
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objerror(o, USER, "bad # of real arguments"); |
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/* allocate/insert material */ |
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m = newmaterial(o->oname); |
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/* assign parameters */ |
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setcolor(m->u.m.ambdiff, o->oargs.farg[0], |
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o->oargs.farg[1], o->oargs.farg[2]); |
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if ((m->type = o->otype) == MAT_MFUNC) |
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copycolor(m->u.m.specular, m->u.m.ambdiff); |
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else |
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setcolor(m->u.m.specular, 1., 1., 1.); |
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scalecolor(m->u.m.specular, o->oargs.farg[3]); |
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scalecolor(m->u.m.ambdiff, 1.-o->oargs.farg[3]); |
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if (m->type == MAT_TFUNC) { |
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scalecolor(m->u.m.specular, 1.-o->oargs.farg[4]); |
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scalecolor(m->u.m.ambdiff, 1.-o->oargs.farg[4]); |
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} |
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m->u.m.specexp = UNKSPECEXP; |
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} |
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m_brdf2(o) /* convert advanced functional material */ |
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register OBJREC *o; |
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{ |
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register MATREC *m; |
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if (o->oargs.nfargs < 9) |
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objerror(o, USER, "bad # of real arguments"); |
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m = newmaterial(o->oname); |
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m->type = o->otype; |
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/* assign average diffuse front+back */ |
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setcolor(m->u.m.ambdiff, (o->oargs.farg[0]+o->oargs.farg[3])*.5, |
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(o->oargs.farg[1]+o->oargs.farg[4])*.5, |
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(o->oargs.farg[2]+o->oargs.farg[5])*.5); |
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/* guess the rest */ |
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setcolor(m->u.m.specular, .1, .1, .1); |
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m->u.m.specexp = UNKSPECEXP; |
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} |
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m_light(o) /* convert light type */ |
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register OBJREC *o; |
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{ |
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FVECT v; |
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register MATREC *m; |
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if (o->oargs.nfargs < (o->otype == MAT_SPOT ? 7 : 3)) |
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objerror(o, USER, "bad # of real arguments"); |
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m = newmaterial(o->oname); |
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setcolor(m->u.l.emission, o->oargs.farg[0], |
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o->oargs.farg[1], o->oargs.farg[2]); |
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if ((m->type = o->otype) == MAT_SPOT) { |
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if ((m->u.l.spotang = o->oargs.farg[3]/2.) > 90.) |
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m->u.l.spotang = 180.; |
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v[0] = o->oargs.farg[4]; |
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v[1] = o->oargs.farg[5]; |
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v[2] = o->oargs.farg[6]; |
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if (normalize(v) == 0.) |
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objerror(o, USER, "illegal direction"); |
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VCOPY(m->u.l.spotdir, v); |
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} else { |
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m->u.l.spotang = 180.; |
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m->u.l.spotdir[0] = m->u.l.spotdir[1] = 0.; |
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m->u.l.spotdir[2] = -1.; |
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} |
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} |
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m_mirror(o) /* convert mirror type */ |
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register OBJREC *o; |
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{ |
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register MATREC *m; |
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if (o->oargs.nfargs != 3) |
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objerror(o, USER, "bad # real arguments"); |
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m = newmaterial(o->oname); |
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m->type = o->otype; |
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setcolor(m->u.m.ambdiff, 0., 0., 0.); |
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setcolor(m->u.m.specular, o->oargs.farg[0], |
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o->oargs.farg[1], o->oargs.farg[2]); |
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m->u.m.specexp = MAXSPECEXP; |
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} |
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m_prism(o) /* convert prism type */ |
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register OBJREC *o; |
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{ |
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register MATREC *m; |
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/* can't really deal with this type */ |
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m = newmaterial(o->oname); |
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m->type = o->otype; |
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setcolor(m->u.m.ambdiff, 0.2, 0.2, 0.2); |
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setcolor(m->u.m.specular, 0.1, 0.1, 0.1); |
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m->u.m.specexp = UNKSPECEXP; |
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} |
