2 ======================================================================
5 Surface functions for an LWO2 reader.
8 ====================================================================== */
10 #include "../picointernal.h"
15 ======================================================================
18 Free the memory used by an lwPlugin.
19 ====================================================================== */
21 void lwFreePlugin( lwPlugin *p )
24 if ( p->ord ) _pico_free( p->ord );
25 if ( p->name ) _pico_free( p->name );
26 if ( p->data ) _pico_free( p->data );
33 ======================================================================
36 Free the memory used by an lwTexture.
37 ====================================================================== */
39 void lwFreeTexture( lwTexture *t )
42 if ( t->ord ) _pico_free( t->ord );
45 if ( t->param.imap.vmap_name ) _pico_free( t->param.imap.vmap_name );
48 if ( t->param.proc.name ) _pico_free( t->param.proc.name );
49 if ( t->param.proc.data ) _pico_free( t->param.proc.data );
52 if ( t->param.grad.key ) _pico_free( t->param.grad.key );
53 if ( t->param.grad.ikey ) _pico_free( t->param.grad.ikey );
62 ======================================================================
65 Free the memory used by an lwSurface.
66 ====================================================================== */
68 void lwFreeSurface( lwSurface *surf )
71 if ( surf->name ) _pico_free( surf->name );
72 if ( surf->srcname ) _pico_free( surf->srcname );
74 lwListFree( surf->shader, lwFreePlugin );
76 lwListFree( surf->color.tex, lwFreeTexture );
77 lwListFree( surf->luminosity.tex, lwFreeTexture );
78 lwListFree( surf->diffuse.tex, lwFreeTexture );
79 lwListFree( surf->specularity.tex, lwFreeTexture );
80 lwListFree( surf->glossiness.tex, lwFreeTexture );
81 lwListFree( surf->reflection.val.tex, lwFreeTexture );
82 lwListFree( surf->transparency.val.tex, lwFreeTexture );
83 lwListFree( surf->eta.tex, lwFreeTexture );
84 lwListFree( surf->translucency.tex, lwFreeTexture );
85 lwListFree( surf->bump.tex, lwFreeTexture );
93 ======================================================================
96 Read a texture map header from a SURF.BLOK in an LWO2 file. This is
97 the first subchunk in a BLOK, and its contents are common to all three
99 ====================================================================== */
101 int lwGetTHeader( picoMemStream_t *fp, int hsz, lwTexture *tex )
108 /* remember where we started */
111 pos = _pico_memstream_tell( fp );
115 tex->ord = getS0( fp );
117 /* first subchunk header */
121 if ( 0 > get_flen() ) return 0;
123 /* process subchunks as they're encountered */
131 tex->chan = getU4( fp );
135 tex->opac_type = getU2( fp );
136 tex->opacity.val = getF4( fp );
137 tex->opacity.eindex = getVX( fp );
141 tex->enabled = getU2( fp );
145 tex->negative = getU2( fp );
149 tex->axis = getU2( fp );
156 /* error while reading current subchunk? */
159 if ( rlen < 0 || rlen > sz ) return 0;
161 /* skip unread parts of the current subchunk */
164 _pico_memstream_seek( fp, sz - rlen, PICO_SEEK_CUR );
166 /* end of the texture header subchunk? */
168 if ( hsz <= _pico_memstream_tell( fp ) - pos )
171 /* get the next subchunk header */
176 if ( 6 != get_flen() ) return 0;
179 set_flen( _pico_memstream_tell( fp ) - pos );
185 ======================================================================
188 Read a texture map from a SURF.BLOK in an LWO2 file. The TMAP
189 defines the mapping from texture to world or object coordinates.
190 ====================================================================== */
192 int lwGetTMap( picoMemStream_t *fp, int tmapsz, lwTMap *tmap )
198 pos = _pico_memstream_tell( fp );
201 if ( 0 > get_flen() ) return 0;
209 for ( i = 0; i < 3; i++ )
210 tmap->size.val[ i ] = getF4( fp );
211 tmap->size.eindex = getVX( fp );
215 for ( i = 0; i < 3; i++ )
216 tmap->center.val[ i ] = getF4( fp );
217 tmap->center.eindex = getVX( fp );
221 for ( i = 0; i < 3; i++ )
222 tmap->rotate.val[ i ] = getF4( fp );
223 tmap->rotate.eindex = getVX( fp );
227 tmap->fall_type = getU2( fp );
228 for ( i = 0; i < 3; i++ )
229 tmap->falloff.val[ i ] = getF4( fp );
230 tmap->falloff.eindex = getVX( fp );
234 tmap->ref_object = getS0( fp );
238 tmap->coord_sys = getU2( fp );
245 /* error while reading the current subchunk? */
248 if ( rlen < 0 || rlen > sz ) return 0;
250 /* skip unread parts of the current subchunk */
253 _pico_memstream_seek( fp, sz - rlen, PICO_SEEK_CUR );
255 /* end of the TMAP subchunk? */
257 if ( tmapsz <= _pico_memstream_tell( fp ) - pos )
260 /* get the next subchunk header */
265 if ( 6 != get_flen() ) return 0;
268 set_flen( _pico_memstream_tell( fp ) - pos );
274 ======================================================================
277 Read an lwImageMap from a SURF.BLOK in an LWO2 file.
278 ====================================================================== */
280 int lwGetImageMap( picoMemStream_t *fp, int rsz, lwTexture *tex )
286 pos = _pico_memstream_tell( fp );
289 if ( 0 > get_flen() ) return 0;
297 if ( !lwGetTMap( fp, sz, &tex->tmap )) return 0;
301 tex->param.imap.projection = getU2( fp );
305 tex->param.imap.vmap_name = getS0( fp );
309 tex->param.imap.axis = getU2( fp );
313 tex->param.imap.cindex = getVX( fp );
317 tex->param.imap.wrapw_type = getU2( fp );
318 tex->param.imap.wraph_type = getU2( fp );
322 tex->param.imap.wrapw.val = getF4( fp );
323 tex->param.imap.wrapw.eindex = getVX( fp );
327 tex->param.imap.wraph.val = getF4( fp );
328 tex->param.imap.wraph.eindex = getVX( fp );
332 tex->param.imap.aas_flags = getU2( fp );
333 tex->param.imap.aa_strength = getF4( fp );
337 tex->param.imap.pblend = getU2( fp );
341 tex->param.imap.stck.val = getF4( fp );
342 tex->param.imap.stck.eindex = getVX( fp );
346 tex->param.imap.amplitude.val = getF4( fp );
347 tex->param.imap.amplitude.eindex = getVX( fp );
354 /* error while reading the current subchunk? */
357 if ( rlen < 0 || rlen > sz ) return 0;
359 /* skip unread parts of the current subchunk */
362 _pico_memstream_seek( fp, sz - rlen, PICO_SEEK_CUR );
364 /* end of the image map? */
366 if ( rsz <= _pico_memstream_tell( fp ) - pos )
369 /* get the next subchunk header */
374 if ( 6 != get_flen() ) return 0;
377 set_flen( _pico_memstream_tell( fp ) - pos );
383 ======================================================================
386 Read an lwProcedural from a SURF.BLOK in an LWO2 file.
387 ====================================================================== */
389 int lwGetProcedural( picoMemStream_t *fp, int rsz, lwTexture *tex )
395 pos = _pico_memstream_tell( fp );
398 if ( 0 > get_flen() ) return 0;
406 if ( !lwGetTMap( fp, sz, &tex->tmap )) return 0;
410 tex->param.proc.axis = getU2( fp );
414 tex->param.proc.value[ 0 ] = getF4( fp );
415 if ( sz >= 8 ) tex->param.proc.value[ 1 ] = getF4( fp );
416 if ( sz >= 12 ) tex->param.proc.value[ 2 ] = getF4( fp );
420 tex->param.proc.name = getS0( fp );
422 tex->param.proc.data = getbytes( fp, sz - rlen );
429 /* error while reading the current subchunk? */
432 if ( rlen < 0 || rlen > sz ) return 0;
434 /* skip unread parts of the current subchunk */
437 _pico_memstream_seek( fp, sz - rlen, PICO_SEEK_CUR );
439 /* end of the procedural block? */
441 if ( rsz <= _pico_memstream_tell( fp ) - pos )
444 /* get the next subchunk header */
449 if ( 6 != get_flen() ) return 0;
452 set_flen( _pico_memstream_tell( fp ) - pos );
458 ======================================================================
461 Read an lwGradient from a SURF.BLOK in an LWO2 file.
462 ====================================================================== */
464 int lwGetGradient( picoMemStream_t *fp, int rsz, lwTexture *tex )
468 int rlen, pos, i, j, nkeys;
470 pos = _pico_memstream_tell( fp );
473 if ( 0 > get_flen() ) return 0;
481 if ( !lwGetTMap( fp, sz, &tex->tmap )) return 0;
485 tex->param.grad.paramname = getS0( fp );
489 tex->param.grad.itemname = getS0( fp );
493 tex->param.grad.start = getF4( fp );
497 tex->param.grad.end = getF4( fp );
501 tex->param.grad.repeat = getU2( fp );
505 nkeys = sz / sizeof( lwGradKey );
506 tex->param.grad.key = _pico_calloc( nkeys, sizeof( lwGradKey ));
507 if ( !tex->param.grad.key ) return 0;
508 for ( i = 0; i < nkeys; i++ ) {
509 tex->param.grad.key[ i ].value = getF4( fp );
510 for ( j = 0; j < 4; j++ )
511 tex->param.grad.key[ i ].rgba[ j ] = getF4( fp );
517 tex->param.grad.ikey = _pico_calloc( nkeys, sizeof( short ));
518 if ( !tex->param.grad.ikey ) return 0;
519 for ( i = 0; i < nkeys; i++ )
520 tex->param.grad.ikey[ i ] = getU2( fp );
527 /* error while reading the current subchunk? */
530 if ( rlen < 0 || rlen > sz ) return 0;
532 /* skip unread parts of the current subchunk */
535 _pico_memstream_seek( fp, sz - rlen, PICO_SEEK_CUR );
537 /* end of the gradient? */
539 if ( rsz <= _pico_memstream_tell( fp ) - pos )
542 /* get the next subchunk header */
547 if ( 6 != get_flen() ) return 0;
550 set_flen( _pico_memstream_tell( fp ) - pos );
556 ======================================================================
559 Read an lwTexture from a SURF.BLOK in an LWO2 file.
560 ====================================================================== */
562 lwTexture *lwGetTexture( picoMemStream_t *fp, int bloksz, unsigned int type )
568 tex = _pico_calloc( 1, sizeof( lwTexture ));
569 if ( !tex ) return NULL;
572 tex->tmap.size.val[ 0 ] =
573 tex->tmap.size.val[ 1 ] =
574 tex->tmap.size.val[ 2 ] = 1.0f;
575 tex->opacity.val = 1.0f;
579 if ( !lwGetTHeader( fp, sz, tex )) {
584 sz = bloksz - sz - 6;
586 case ID_IMAP: ok = lwGetImageMap( fp, sz, tex ); break;
587 case ID_PROC: ok = lwGetProcedural( fp, sz, tex ); break;
588 case ID_GRAD: ok = lwGetGradient( fp, sz, tex ); break;
590 ok = !_pico_memstream_seek( fp, sz, PICO_SEEK_CUR );
594 lwFreeTexture( tex );
604 ======================================================================
607 Read a shader record from a SURF.BLOK in an LWO2 file.
608 ====================================================================== */
610 lwPlugin *lwGetShader( picoMemStream_t *fp, int bloksz )
617 shdr = _pico_calloc( 1, sizeof( lwPlugin ));
618 if ( !shdr ) return NULL;
620 pos = _pico_memstream_tell( fp );
623 shdr->ord = getS0( fp );
626 if ( 0 > get_flen() ) goto Fail;
631 if ( id == ID_ENAB ) {
632 shdr->flags = getU2( fp );
636 _pico_memstream_seek( fp, sz, PICO_SEEK_CUR );
644 if ( 0 > get_flen() ) goto Fail;
652 shdr->name = getS0( fp );
654 shdr->data = getbytes( fp, sz - rlen );
661 /* error while reading the current subchunk? */
664 if ( rlen < 0 || rlen > sz ) goto Fail;
666 /* skip unread parts of the current subchunk */
669 _pico_memstream_seek( fp, sz - rlen, PICO_SEEK_CUR );
671 /* end of the shader block? */
673 if ( bloksz <= _pico_memstream_tell( fp ) - pos )
676 /* get the next subchunk header */
681 if ( 6 != get_flen() ) goto Fail;
684 set_flen( _pico_memstream_tell( fp ) - pos );
688 lwFreePlugin( shdr );
694 ======================================================================
698 Callbacks for the lwListInsert() function, which is called to add
699 textures to surface channels and shaders to surfaces.
700 ====================================================================== */
702 static int compare_textures( lwTexture *a, lwTexture *b )
704 return strcmp( a->ord, b->ord );
708 static int compare_shaders( lwPlugin *a, lwPlugin *b )
710 return strcmp( a->ord, b->ord );
715 ======================================================================
718 Finds the surface channel (lwTParam or lwCParam) to which a texture is
719 applied, then calls lwListInsert().
720 ====================================================================== */
722 static int add_texture( lwSurface *surf, lwTexture *tex )
726 switch ( tex->chan ) {
727 case ID_COLR: list = &surf->color.tex; break;
728 case ID_LUMI: list = &surf->luminosity.tex; break;
729 case ID_DIFF: list = &surf->diffuse.tex; break;
730 case ID_SPEC: list = &surf->specularity.tex; break;
731 case ID_GLOS: list = &surf->glossiness.tex; break;
732 case ID_REFL: list = &surf->reflection.val.tex; break;
733 case ID_TRAN: list = &surf->transparency.val.tex; break;
734 case ID_RIND: list = &surf->eta.tex; break;
735 case ID_TRNL: list = &surf->translucency.tex; break;
736 case ID_BUMP: list = &surf->bump.tex; break;
740 lwListInsert( list, tex, compare_textures );
746 ======================================================================
749 Allocate and initialize a surface.
750 ====================================================================== */
752 lwSurface *lwDefaultSurface( void )
756 surf = _pico_calloc( 1, sizeof( lwSurface ));
757 if ( !surf ) return NULL;
759 surf->color.rgb[ 0 ] = 0.78431f;
760 surf->color.rgb[ 1 ] = 0.78431f;
761 surf->color.rgb[ 2 ] = 0.78431f;
762 surf->diffuse.val = 1.0f;
763 surf->glossiness.val = 0.4f;
764 surf->bump.val = 1.0f;
765 surf->eta.val = 1.0f;
773 ======================================================================
776 Read an lwSurface from an LWO2 file.
777 ====================================================================== */
779 lwSurface *lwGetSurface( picoMemStream_t *fp, int cksize )
784 unsigned int id, type;
789 /* allocate the Surface structure */
791 surf = _pico_calloc( 1, sizeof( lwSurface ));
792 if ( !surf ) goto Fail;
794 /* non-zero defaults */
796 surf->color.rgb[ 0 ] = 0.78431f;
797 surf->color.rgb[ 1 ] = 0.78431f;
798 surf->color.rgb[ 2 ] = 0.78431f;
799 surf->diffuse.val = 1.0f;
800 surf->glossiness.val = 0.4f;
801 surf->bump.val = 1.0f;
802 surf->eta.val = 1.0f;
805 /* remember where we started */
808 pos = _pico_memstream_tell( fp );
812 surf->name = getS0( fp );
813 surf->srcname = getS0( fp );
815 /* first subchunk header */
819 if ( 0 > get_flen() ) goto Fail;
821 /* process subchunks as they're encountered */
829 surf->color.rgb[ 0 ] = getF4( fp );
830 surf->color.rgb[ 1 ] = getF4( fp );
831 surf->color.rgb[ 2 ] = getF4( fp );
832 surf->color.eindex = getVX( fp );
836 surf->luminosity.val = getF4( fp );
837 surf->luminosity.eindex = getVX( fp );
841 surf->diffuse.val = getF4( fp );
842 surf->diffuse.eindex = getVX( fp );
846 surf->specularity.val = getF4( fp );
847 surf->specularity.eindex = getVX( fp );
851 surf->glossiness.val = getF4( fp );
852 surf->glossiness.eindex = getVX( fp );
856 surf->reflection.val.val = getF4( fp );
857 surf->reflection.val.eindex = getVX( fp );
861 surf->reflection.options = getU2( fp );
865 surf->reflection.cindex = getVX( fp );
869 surf->reflection.seam_angle = getF4( fp );
873 surf->transparency.val.val = getF4( fp );
874 surf->transparency.val.eindex = getVX( fp );
878 surf->transparency.options = getU2( fp );
882 surf->transparency.cindex = getVX( fp );
886 surf->eta.val = getF4( fp );
887 surf->eta.eindex = getVX( fp );
891 surf->translucency.val = getF4( fp );
892 surf->translucency.eindex = getVX( fp );
896 surf->bump.val = getF4( fp );
897 surf->bump.eindex = getVX( fp );
901 surf->smooth = getF4( fp );
905 surf->sideflags = getU2( fp );
909 surf->color_hilite.val = getF4( fp );
910 surf->color_hilite.eindex = getVX( fp );
914 surf->color_filter.val = getF4( fp );
915 surf->color_filter.eindex = getVX( fp );
919 surf->add_trans.val = getF4( fp );
920 surf->add_trans.eindex = getVX( fp );
924 surf->dif_sharp.val = getF4( fp );
925 surf->dif_sharp.eindex = getVX( fp );
929 surf->glow.val = getF4( fp );
930 surf->glow.eindex = getVX( fp );
934 surf->line.enabled = 1;
935 if ( sz >= 2 ) surf->line.flags = getU2( fp );
936 if ( sz >= 6 ) surf->line.size.val = getF4( fp );
937 if ( sz >= 8 ) surf->line.size.eindex = getVX( fp );
941 surf->alpha_mode = getU2( fp );
942 surf->alpha = getF4( fp );
946 surf->alpha = getF4( fp );
956 tex = lwGetTexture( fp, sz - 4, type );
957 if ( !tex ) goto Fail;
958 if ( !add_texture( surf, tex ))
959 lwFreeTexture( tex );
960 set_flen( 4 + get_flen() );
963 shdr = lwGetShader( fp, sz - 4 );
964 if ( !shdr ) goto Fail;
965 lwListInsert( &surf->shader, shdr, compare_shaders );
967 set_flen( 4 + get_flen() );
976 /* error while reading current subchunk? */
979 if ( rlen < 0 || rlen > sz ) goto Fail;
981 /* skip unread parts of the current subchunk */
984 _pico_memstream_seek( fp, sz - rlen, PICO_SEEK_CUR );
986 /* end of the SURF chunk? */
988 if ( cksize <= _pico_memstream_tell( fp ) - pos )
991 /* get the next subchunk header */
996 if ( 6 != get_flen() ) goto Fail;
1002 if ( surf ) lwFreeSurface( surf );