lwTexture *lwGetTexture( picoMemStream_t *fp, int bloksz, unsigned int type ) {
lwTexture *tex;
unsigned short sz;
int ok;
tex = _pico_calloc( 1, sizeof( lwTexture ) );
if ( !tex ) {
return NULL;
}
tex->type = type;
tex->tmap.size.val[ 0 ] =
tex->tmap.size.val[ 1 ] =
tex->tmap.size.val[ 2 ] = 1.0f;
tex->opacity.val = 1.0f;
tex->enabled = 1;
sz = getU2( fp );
if ( !lwGetTHeader( fp, sz, tex ) ) {
_pico_free( tex );
return NULL;
}
sz = bloksz - sz - 6;
switch ( type ) {
case ID_IMAP:
ok = lwGetImageMap( fp, sz, tex );
break;
case ID_PROC:
ok = lwGetProcedural( fp, sz, tex );
break;
case ID_GRAD:
ok = lwGetGradient( fp, sz, tex );
break;
default:
ok = !_pico_memstream_seek( fp, sz, PICO_SEEK_CUR );
}
if ( !ok ) {
lwFreeTexture( tex );
return NULL;
}
set_flen( bloksz );
return tex;
}
lwSurface *lwGetSurface( picoMemStream_t *fp, int cksize ){
lwSurface *surf;
lwTexture *tex;
lwPlugin *shdr;
unsigned int id, type;
unsigned short sz;
int pos, rlen;
/* allocate the Surface structure */
surf = _pico_calloc( 1, sizeof( lwSurface ) );
if ( !surf ) {
goto Fail;
}
/* non-zero defaults */
surf->color.rgb[ 0 ] = 0.78431f;
surf->color.rgb[ 1 ] = 0.78431f;
surf->color.rgb[ 2 ] = 0.78431f;
surf->diffuse.val = 1.0f;
surf->glossiness.val = 0.4f;
surf->bump.val = 1.0f;
surf->eta.val = 1.0f;
surf->sideflags = 1;
/* remember where we started */
set_flen( 0 );
pos = _pico_memstream_tell( fp );
/* names */
surf->name = getS0( fp );
surf->srcname = getS0( fp );
/* first subchunk header */
id = getU4( fp );
sz = getU2( fp );
if ( 0 > get_flen() ) {
goto Fail;
}
/* process subchunks as they're encountered */
while ( 1 ) {
sz += sz & 1;
set_flen( 0 );
switch ( id ) {
case ID_COLR:
surf->color.rgb[ 0 ] = getF4( fp );
surf->color.rgb[ 1 ] = getF4( fp );
surf->color.rgb[ 2 ] = getF4( fp );
surf->color.eindex = getVX( fp );
break;
case ID_LUMI:
surf->luminosity.val = getF4( fp );
surf->luminosity.eindex = getVX( fp );
break;
case ID_DIFF:
surf->diffuse.val = getF4( fp );
surf->diffuse.eindex = getVX( fp );
break;
case ID_SPEC:
surf->specularity.val = getF4( fp );
surf->specularity.eindex = getVX( fp );
break;
case ID_GLOS:
surf->glossiness.val = getF4( fp );
surf->glossiness.eindex = getVX( fp );
break;
case ID_REFL:
surf->reflection.val.val = getF4( fp );
surf->reflection.val.eindex = getVX( fp );
break;
case ID_RFOP:
surf->reflection.options = getU2( fp );
break;
case ID_RIMG:
surf->reflection.cindex = getVX( fp );
break;
case ID_RSAN:
surf->reflection.seam_angle = getF4( fp );
break;
case ID_TRAN:
surf->transparency.val.val = getF4( fp );
surf->transparency.val.eindex = getVX( fp );
break;
case ID_TROP:
surf->transparency.options = getU2( fp );
break;
case ID_TIMG:
surf->transparency.cindex = getVX( fp );
break;
case ID_RIND:
surf->eta.val = getF4( fp );
surf->eta.eindex = getVX( fp );
break;
case ID_TRNL:
surf->translucency.val = getF4( fp );
surf->translucency.eindex = getVX( fp );
break;
case ID_BUMP:
surf->bump.val = getF4( fp );
surf->bump.eindex = getVX( fp );
break;
case ID_SMAN:
surf->smooth = getF4( fp );
break;
case ID_SIDE:
surf->sideflags = getU2( fp );
break;
case ID_CLRH:
surf->color_hilite.val = getF4( fp );
surf->color_hilite.eindex = getVX( fp );
break;
case ID_CLRF:
surf->color_filter.val = getF4( fp );
surf->color_filter.eindex = getVX( fp );
break;
case ID_ADTR:
surf->add_trans.val = getF4( fp );
surf->add_trans.eindex = getVX( fp );
break;
case ID_SHRP:
surf->dif_sharp.val = getF4( fp );
surf->dif_sharp.eindex = getVX( fp );
break;
case ID_GVAL:
surf->glow.val = getF4( fp );
surf->glow.eindex = getVX( fp );
break;
case ID_LINE:
surf->line.enabled = 1;
if ( sz >= 2 ) {
surf->line.flags = getU2( fp );
}
if ( sz >= 6 ) {
surf->line.size.val = getF4( fp );
}
if ( sz >= 8 ) {
surf->line.size.eindex = getVX( fp );
}
break;
case ID_ALPH:
surf->alpha_mode = getU2( fp );
surf->alpha = getF4( fp );
break;
case ID_AVAL:
surf->alpha = getF4( fp );
break;
case ID_BLOK:
type = getU4( fp );
switch ( type ) {
case ID_IMAP:
case ID_PROC:
case ID_GRAD:
tex = lwGetTexture( fp, sz - 4, type );
if ( !tex ) {
goto Fail;
}
if ( !add_texture( surf, tex ) ) {
lwFreeTexture( tex );
}
set_flen( 4 + get_flen() );
break;
case ID_SHDR:
shdr = lwGetShader( fp, sz - 4 );
if ( !shdr ) {
goto Fail;
}
lwListInsert( (void **) &surf->shader, shdr, (void *) compare_shaders );
++surf->nshaders;
set_flen( 4 + get_flen() );
break;
}
break;
default:
break;
}
/* error while reading current subchunk? */
rlen = get_flen();
if ( rlen < 0 || rlen > sz ) {
goto Fail;
}
/* skip unread parts of the current subchunk */
if ( rlen < sz ) {
_pico_memstream_seek( fp, sz - rlen, PICO_SEEK_CUR );
}
/* end of the SURF chunk? */
if ( cksize <= _pico_memstream_tell( fp ) - pos ) {
break;
}
/* get the next subchunk header */
set_flen( 0 );
id = getU4( fp );
sz = getU2( fp );
if ( 6 != get_flen() ) {
goto Fail;
}
}
return surf;
Fail:
if ( surf ) {
lwFreeSurface( surf );
}
return NULL;
}
