589 lines
14 KiB
C
589 lines
14 KiB
C
/*
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======================================================================
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pntspols.c
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Point and polygon functions for an LWO2 reader.
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Ernie Wright 17 Sep 00
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====================================================================== */
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#include "picointernal.h"
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#include "lwo2.h"
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/*
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======================================================================
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lwFreePoints()
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Free the memory used by an lwPointList.
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====================================================================== */
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void lwFreePoints( lwPointList *point ){
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int i;
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if ( point ) {
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if ( point->pt ) {
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for ( i = 0; i < point->count; i++ ) {
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if ( point->pt[ i ].pol ) {
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_pico_free( point->pt[ i ].pol );
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}
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if ( point->pt[ i ].vm ) {
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_pico_free( point->pt[ i ].vm );
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}
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}
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_pico_free( point->pt );
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}
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memset( point, 0, sizeof( lwPointList ) );
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}
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}
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/*
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======================================================================
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lwFreePolygons()
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Free the memory used by an lwPolygonList.
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====================================================================== */
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void lwFreePolygons( lwPolygonList *plist ){
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int i, j;
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if ( plist ) {
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if ( plist->pol ) {
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for ( i = 0; i < plist->count; i++ ) {
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if ( plist->pol[ i ].v ) {
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for ( j = 0; j < plist->pol[ i ].nverts; j++ )
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if ( plist->pol[ i ].v[ j ].vm ) {
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_pico_free( plist->pol[ i ].v[ j ].vm );
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}
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}
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}
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if ( plist->pol[ 0 ].v ) {
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_pico_free( plist->pol[ 0 ].v );
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}
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_pico_free( plist->pol );
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}
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memset( plist, 0, sizeof( lwPolygonList ) );
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}
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}
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/*
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======================================================================
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lwGetPoints()
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Read point records from a PNTS chunk in an LWO2 file. The points are
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added to the array in the lwPointList.
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====================================================================== */
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int lwGetPoints( picoMemStream_t *fp, int cksize, lwPointList *point ){
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float *f;
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int np, i, j;
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if ( cksize == 1 ) {
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return 1;
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}
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/* extend the point array to hold the new points */
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np = cksize / 12;
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point->offset = point->count;
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point->count += np;
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if ( !_pico_realloc( (void *) &point->pt, ( point->count - np ) * sizeof( lwPoint ), point->count * sizeof( lwPoint ) ) ) {
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return 0;
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}
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memset( &point->pt[ point->offset ], 0, np * sizeof( lwPoint ) );
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/* read the whole chunk */
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f = ( float * ) getbytes( fp, cksize );
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if ( !f ) {
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return 0;
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}
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revbytes( f, 4, np * 3 );
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/* assign position values */
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for ( i = 0, j = 0; i < np; i++, j += 3 ) {
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point->pt[ i ].pos[ 0 ] = f[ j ];
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point->pt[ i ].pos[ 1 ] = f[ j + 1 ];
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point->pt[ i ].pos[ 2 ] = f[ j + 2 ];
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}
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_pico_free( f );
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return 1;
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}
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/*
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======================================================================
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lwGetBoundingBox()
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Calculate the bounding box for a point list, but only if the bounding
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box hasn't already been initialized.
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====================================================================== */
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void lwGetBoundingBox( lwPointList *point, float bbox[] ){
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int i, j;
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if ( point->count == 0 ) {
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return;
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}
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for ( i = 0; i < 6; i++ )
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if ( bbox[ i ] != 0.0f ) {
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return;
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}
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bbox[ 0 ] = bbox[ 1 ] = bbox[ 2 ] = 1e20f;
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bbox[ 3 ] = bbox[ 4 ] = bbox[ 5 ] = -1e20f;
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for ( i = 0; i < point->count; i++ ) {
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for ( j = 0; j < 3; j++ ) {
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if ( bbox[ j ] > point->pt[ i ].pos[ j ] ) {
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bbox[ j ] = point->pt[ i ].pos[ j ];
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}
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if ( bbox[ j + 3 ] < point->pt[ i ].pos[ j ] ) {
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bbox[ j + 3 ] = point->pt[ i ].pos[ j ];
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}
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}
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}
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}
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/*
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======================================================================
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lwAllocPolygons()
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Allocate or extend the polygon arrays to hold new records.
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====================================================================== */
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int lwAllocPolygons( lwPolygonList *plist, int npols, int nverts ){
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int i;
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plist->offset = plist->count;
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plist->count += npols;
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if ( !_pico_realloc( (void *) &plist->pol, ( plist->count - npols ) * sizeof( lwPolygon ), plist->count * sizeof( lwPolygon ) ) ) {
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return 0;
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}
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memset( plist->pol + plist->offset, 0, npols * sizeof( lwPolygon ) );
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plist->voffset = plist->vcount;
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plist->vcount += nverts;
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if ( !_pico_realloc( (void *) &plist->pol[ 0 ].v, ( plist->vcount - nverts ) * sizeof( lwPolVert ), plist->vcount * sizeof( lwPolVert ) ) ) {
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return 0;
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}
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memset( plist->pol[ 0 ].v + plist->voffset, 0, nverts * sizeof( lwPolVert ) );
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/* fix up the old vertex pointers */
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for ( i = 1; i < plist->offset; i++ )
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plist->pol[ i ].v = plist->pol[ i - 1 ].v + plist->pol[ i - 1 ].nverts;
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return 1;
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}
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/*
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======================================================================
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lwGetPolygons()
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Read polygon records from a POLS chunk in an LWO2 file. The polygons
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are added to the array in the lwPolygonList.
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====================================================================== */
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int lwGetPolygons( picoMemStream_t *fp, int cksize, lwPolygonList *plist, int ptoffset ){
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lwPolygon *pp;
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lwPolVert *pv;
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unsigned char *buf, *bp;
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int i, j, flags, nv, nverts, npols;
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unsigned int type;
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if ( cksize == 0 ) {
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return 1;
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}
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/* read the whole chunk */
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set_flen( 0 );
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type = getU4( fp );
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buf = getbytes( fp, cksize - 4 );
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if ( cksize != get_flen() ) {
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goto Fail;
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}
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/* count the polygons and vertices */
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nverts = 0;
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npols = 0;
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bp = buf;
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while ( bp < buf + cksize - 4 ) {
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nv = sgetU2( &bp );
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nv &= 0x03FF;
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nverts += nv;
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npols++;
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for ( i = 0; i < nv; i++ )
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j = sgetVX( &bp );
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}
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if ( !lwAllocPolygons( plist, npols, nverts ) ) {
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goto Fail;
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}
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/* fill in the new polygons */
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bp = buf;
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pp = plist->pol + plist->offset;
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pv = plist->pol[ 0 ].v + plist->voffset;
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for ( i = 0; i < npols; i++ ) {
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nv = sgetU2( &bp );
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flags = nv & 0xFC00;
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nv &= 0x03FF;
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pp->nverts = nv;
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pp->flags = flags;
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pp->type = type;
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if ( !pp->v ) {
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pp->v = pv;
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}
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for ( j = 0; j < nv; j++ )
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pp->v[ j ].index = sgetVX( &bp ) + ptoffset;
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pp++;
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pv += nv;
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}
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_pico_free( buf );
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return 1;
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Fail:
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if ( buf ) {
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_pico_free( buf );
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}
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lwFreePolygons( plist );
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return 0;
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}
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/*
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======================================================================
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lwGetPolyNormals()
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Calculate the polygon normals. By convention, LW's polygon normals
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are found as the cross product of the first and last edges. It's
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undefined for one- and two-point polygons.
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====================================================================== */
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void lwGetPolyNormals( lwPointList *point, lwPolygonList *polygon ){
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int i, j;
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float p1[ 3 ], p2[ 3 ], pn[ 3 ], v1[ 3 ], v2[ 3 ];
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for ( i = 0; i < polygon->count; i++ ) {
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if ( polygon->pol[ i ].nverts < 3 ) {
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continue;
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}
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for ( j = 0; j < 3; j++ ) {
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p1[ j ] = point->pt[ polygon->pol[ i ].v[ 0 ].index ].pos[ j ];
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p2[ j ] = point->pt[ polygon->pol[ i ].v[ 1 ].index ].pos[ j ];
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pn[ j ] = point->pt[ polygon->pol[ i ].v[
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polygon->pol[ i ].nverts - 1 ].index ].pos[ j ];
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}
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for ( j = 0; j < 3; j++ ) {
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v1[ j ] = p2[ j ] - p1[ j ];
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v2[ j ] = pn[ j ] - p1[ j ];
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}
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cross( v1, v2, polygon->pol[ i ].norm );
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normalize( polygon->pol[ i ].norm );
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}
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}
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/*
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======================================================================
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lwGetPointPolygons()
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For each point, fill in the indexes of the polygons that share the
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point. Returns 0 if any of the memory allocations fail, otherwise
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returns 1.
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====================================================================== */
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int lwGetPointPolygons( lwPointList *point, lwPolygonList *polygon ){
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int i, j, k;
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/* count the number of polygons per point */
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for ( i = 0; i < polygon->count; i++ )
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for ( j = 0; j < polygon->pol[ i ].nverts; j++ )
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++point->pt[ polygon->pol[ i ].v[ j ].index ].npols;
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/* alloc per-point polygon arrays */
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for ( i = 0; i < point->count; i++ ) {
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if ( point->pt[ i ].npols == 0 ) {
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continue;
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}
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point->pt[ i ].pol = _pico_calloc( point->pt[ i ].npols, sizeof( int ) );
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if ( !point->pt[ i ].pol ) {
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return 0;
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}
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point->pt[ i ].npols = 0;
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}
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/* fill in polygon array for each point */
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for ( i = 0; i < polygon->count; i++ ) {
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for ( j = 0; j < polygon->pol[ i ].nverts; j++ ) {
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k = polygon->pol[ i ].v[ j ].index;
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point->pt[ k ].pol[ point->pt[ k ].npols ] = i;
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++point->pt[ k ].npols;
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}
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}
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return 1;
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}
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/*
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======================================================================
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lwResolvePolySurfaces()
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Convert tag indexes into actual lwSurface pointers. If any polygons
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point to tags for which no corresponding surface can be found, a
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default surface is created.
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====================================================================== */
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int lwResolvePolySurfaces( lwPolygonList *polygon, lwTagList *tlist,
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lwSurface **surf, int *nsurfs ){
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lwSurface **s, *st;
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int i, index;
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if ( tlist->count == 0 ) {
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return 1;
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}
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s = _pico_calloc( tlist->count, sizeof( lwSurface * ) );
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if ( !s ) {
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return 0;
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}
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for ( i = 0; i < tlist->count; i++ ) {
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st = *surf;
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while ( st ) {
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if ( !strcmp( st->name, tlist->tag[ i ] ) ) {
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s[ i ] = st;
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break;
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}
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st = st->next;
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}
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}
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for ( i = 0; i < polygon->count; i++ ) {
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index = ( size_t ) polygon->pol[ i ].surf;
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if ( index < 0 || index > tlist->count ) {
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return 0;
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}
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if ( !s[ index ] ) {
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s[ index ] = lwDefaultSurface();
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if ( !s[ index ] ) {
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return 0;
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}
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s[ index ]->name = _pico_alloc( strlen( tlist->tag[ index ] ) + 1 );
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if ( !s[ index ]->name ) {
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return 0;
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}
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strcpy( s[ index ]->name, tlist->tag[ index ] );
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lwListAdd( (void *) surf, s[ index ] );
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*nsurfs = *nsurfs + 1;
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}
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polygon->pol[ i ].surf = s[ index ];
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}
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_pico_free( s );
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return 1;
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}
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/*
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======================================================================
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lwGetVertNormals()
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Calculate the vertex normals. For each polygon vertex, sum the
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normals of the polygons that share the point. If the normals of the
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current and adjacent polygons form an angle greater than the max
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smoothing angle for the current polygon's surface, the normal of the
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adjacent polygon is excluded from the sum. It's also excluded if the
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polygons aren't in the same smoothing group.
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Assumes that lwGetPointPolygons(), lwGetPolyNormals() and
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lwResolvePolySurfaces() have already been called.
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====================================================================== */
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void lwGetVertNormals( lwPointList *point, lwPolygonList *polygon ){
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int j, k, n, g, h, p;
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float a;
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for ( j = 0; j < polygon->count; j++ ) {
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for ( n = 0; n < polygon->pol[ j ].nverts; n++ ) {
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for ( k = 0; k < 3; k++ )
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polygon->pol[ j ].v[ n ].norm[ k ] = polygon->pol[ j ].norm[ k ];
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if ( polygon->pol[ j ].surf->smooth <= 0 ) {
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continue;
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}
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p = polygon->pol[ j ].v[ n ].index;
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for ( g = 0; g < point->pt[ p ].npols; g++ ) {
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h = point->pt[ p ].pol[ g ];
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if ( h == j ) {
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continue;
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}
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if ( polygon->pol[ j ].smoothgrp != polygon->pol[ h ].smoothgrp ) {
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continue;
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}
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a = vecangle( polygon->pol[ j ].norm, polygon->pol[ h ].norm );
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if ( a > polygon->pol[ j ].surf->smooth ) {
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continue;
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}
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for ( k = 0; k < 3; k++ )
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polygon->pol[ j ].v[ n ].norm[ k ] += polygon->pol[ h ].norm[ k ];
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}
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normalize( polygon->pol[ j ].v[ n ].norm );
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}
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}
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}
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/*
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======================================================================
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lwFreeTags()
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Free memory used by an lwTagList.
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====================================================================== */
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void lwFreeTags( lwTagList *tlist ){
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int i;
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if ( tlist ) {
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if ( tlist->tag ) {
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for ( i = 0; i < tlist->count; i++ )
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if ( tlist->tag[ i ] ) {
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_pico_free( tlist->tag[ i ] );
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}
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_pico_free( tlist->tag );
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}
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memset( tlist, 0, sizeof( lwTagList ) );
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}
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}
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/*
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======================================================================
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lwGetTags()
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Read tag strings from a TAGS chunk in an LWO2 file. The tags are
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added to the lwTagList array.
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====================================================================== */
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int lwGetTags( picoMemStream_t *fp, int cksize, lwTagList *tlist ){
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char *buf, *bp;
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int i, len, ntags;
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if ( cksize == 0 ) {
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return 1;
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}
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/* read the whole chunk */
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set_flen( 0 );
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buf = getbytes( fp, cksize );
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if ( !buf ) {
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return 0;
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}
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/* count the strings */
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ntags = 0;
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bp = buf;
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while ( bp < buf + cksize ) {
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len = strlen( bp ) + 1;
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len += len & 1;
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bp += len;
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++ntags;
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}
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/* expand the string array to hold the new tags */
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tlist->offset = tlist->count;
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tlist->count += ntags;
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if ( !_pico_realloc( (void *) &tlist->tag, ( tlist->count - ntags ) * sizeof( char * ), tlist->count * sizeof( char * ) ) ) {
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goto Fail;
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}
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memset( &tlist->tag[ tlist->offset ], 0, ntags * sizeof( char * ) );
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/* copy the new tags to the tag array */
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bp = buf;
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for ( i = 0; i < ntags; i++ )
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tlist->tag[ i + tlist->offset ] = sgetS0( (unsigned char **) &bp );
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_pico_free( buf );
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return 1;
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Fail:
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if ( buf ) {
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_pico_free( buf );
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}
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return 0;
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}
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/*
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======================================================================
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lwGetPolygonTags()
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Read polygon tags from a PTAG chunk in an LWO2 file.
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====================================================================== */
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int lwGetPolygonTags( picoMemStream_t *fp, int cksize, lwTagList *tlist,
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lwPolygonList *plist ){
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unsigned int type;
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int rlen = 0, i, j;
|
|
|
|
set_flen( 0 );
|
|
type = getU4( fp );
|
|
rlen = get_flen();
|
|
if ( rlen < 0 ) {
|
|
return 0;
|
|
}
|
|
|
|
if ( type != ID_SURF && type != ID_PART && type != ID_SMGP ) {
|
|
_pico_memstream_seek( fp, cksize - 4, PICO_SEEK_CUR );
|
|
return 1;
|
|
}
|
|
|
|
while ( rlen < cksize ) {
|
|
i = getVX( fp ) + plist->offset;
|
|
j = getVX( fp ) + tlist->offset;
|
|
rlen = get_flen();
|
|
if ( rlen < 0 || rlen > cksize ) {
|
|
return 0;
|
|
}
|
|
|
|
switch ( type ) {
|
|
case ID_SURF: plist->pol[ i ].surf = ( lwSurface * ) (size_t) j; break;
|
|
case ID_PART: plist->pol[ i ].part = j; break;
|
|
case ID_SMGP: plist->pol[ i ].smoothgrp = j; break;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|