365 lines
7.7 KiB
C
365 lines
7.7 KiB
C
/*
|
|
======================================================================
|
|
lwo2.c
|
|
|
|
The entry point for loading LightWave object files.
|
|
|
|
Ernie Wright 17 Sep 00
|
|
====================================================================== */
|
|
|
|
#include "picointernal.h"
|
|
#include "lwo2.h"
|
|
#include "globaldefs.h"
|
|
|
|
/* disable warnings */
|
|
#if GDEF_COMPILER_MSVC
|
|
#pragma warning( disable:4018 ) /* signed/unsigned mismatch */
|
|
#endif
|
|
|
|
|
|
/*
|
|
======================================================================
|
|
lwFreeLayer()
|
|
|
|
Free memory used by an lwLayer.
|
|
====================================================================== */
|
|
|
|
void lwFreeLayer( lwLayer *layer ){
|
|
if ( layer ) {
|
|
if ( layer->name ) {
|
|
_pico_free( layer->name );
|
|
}
|
|
lwFreePoints( &layer->point );
|
|
lwFreePolygons( &layer->polygon );
|
|
lwListFree(layer->vmap, (void (*)(void *)) lwFreeVMap);
|
|
_pico_free( layer );
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
======================================================================
|
|
lwFreeObject()
|
|
|
|
Free memory used by an lwObject.
|
|
====================================================================== */
|
|
|
|
void lwFreeObject( lwObject *object ){
|
|
if ( object ) {
|
|
lwListFree(object->layer, (void (*)(void *)) lwFreeLayer);
|
|
lwListFree(object->env, (void (*)(void *)) lwFreeEnvelope);
|
|
lwListFree(object->clip, (void (*)(void *)) lwFreeClip);
|
|
lwListFree(object->surf, (void (*)(void *)) lwFreeSurface);
|
|
lwFreeTags( &object->taglist );
|
|
_pico_free( object );
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
======================================================================
|
|
lwGetObject()
|
|
|
|
Returns the contents of a LightWave object, given its filename, or
|
|
NULL if the file couldn't be loaded. On failure, failID and failpos
|
|
can be used to diagnose the cause.
|
|
|
|
1. If the file isn't an LWO2 or an LWOB, failpos will contain 12 and
|
|
failID will be unchanged.
|
|
|
|
2. If an error occurs while reading, failID will contain the most
|
|
recently read IFF chunk ID, and failpos will contain the value
|
|
returned by _pico_memstream_tell() at the time of the failure.
|
|
|
|
3. If the file couldn't be opened, or an error occurs while reading
|
|
the first 12 bytes, both failID and failpos will be unchanged.
|
|
|
|
If you don't need this information, failID and failpos can be NULL.
|
|
====================================================================== */
|
|
|
|
lwObject *lwGetObject( const char *filename, picoMemStream_t *fp, unsigned int *failID, int *failpos ){
|
|
lwObject *object;
|
|
lwLayer *layer;
|
|
lwNode *node;
|
|
unsigned int id, formsize, type;
|
|
int i, rlen, cksize;
|
|
|
|
/* open the file */
|
|
|
|
if ( !fp ) {
|
|
return NULL;
|
|
}
|
|
|
|
/* read the first 12 bytes */
|
|
|
|
set_flen( 0 );
|
|
id = getU4( fp );
|
|
formsize = getU4( fp );
|
|
type = getU4( fp );
|
|
if ( 12 != get_flen() ) {
|
|
return NULL;
|
|
}
|
|
|
|
/* is this a LW object? */
|
|
|
|
if ( id != ID_FORM ) {
|
|
if ( failpos ) {
|
|
*failpos = 12;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
if ( type != ID_LWO2 ) {
|
|
if ( type == ID_LWOB ) {
|
|
return lwGetObject5( filename, fp, failID, failpos );
|
|
}
|
|
else {
|
|
if ( failpos ) {
|
|
*failpos = 12;
|
|
}
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/* allocate an object and a default layer */
|
|
|
|
object = _pico_calloc( 1, sizeof( lwObject ) );
|
|
if ( !object ) {
|
|
goto Fail;
|
|
}
|
|
|
|
layer = _pico_calloc( 1, sizeof( lwLayer ) );
|
|
if ( !layer ) {
|
|
goto Fail;
|
|
}
|
|
object->layer = layer;
|
|
|
|
/* get the first chunk header */
|
|
|
|
id = getU4( fp );
|
|
cksize = getU4( fp );
|
|
if ( 0 > get_flen() ) {
|
|
goto Fail;
|
|
}
|
|
|
|
/* process chunks as they're encountered */
|
|
|
|
while ( 1 ) {
|
|
cksize += cksize & 1;
|
|
|
|
switch ( id )
|
|
{
|
|
case ID_LAYR:
|
|
if ( object->nlayers > 0 ) {
|
|
layer = _pico_calloc( 1, sizeof( lwLayer ) );
|
|
if ( !layer ) {
|
|
goto Fail;
|
|
}
|
|
lwListAdd( (void **) &object->layer, layer );
|
|
}
|
|
object->nlayers++;
|
|
|
|
set_flen( 0 );
|
|
layer->index = getU2( fp );
|
|
layer->flags = getU2( fp );
|
|
layer->pivot[ 0 ] = getF4( fp );
|
|
layer->pivot[ 1 ] = getF4( fp );
|
|
layer->pivot[ 2 ] = getF4( fp );
|
|
layer->name = getS0( fp );
|
|
|
|
rlen = get_flen();
|
|
if ( rlen < 0 || rlen > cksize ) {
|
|
goto Fail;
|
|
}
|
|
if ( rlen <= cksize - 2 ) {
|
|
layer->parent = getU2( fp );
|
|
}
|
|
rlen = get_flen();
|
|
if ( rlen < cksize ) {
|
|
_pico_memstream_seek( fp, cksize - rlen, PICO_SEEK_CUR );
|
|
}
|
|
break;
|
|
|
|
case ID_PNTS:
|
|
if ( !lwGetPoints( fp, cksize, &layer->point ) ) {
|
|
goto Fail;
|
|
}
|
|
break;
|
|
|
|
case ID_POLS:
|
|
if ( !lwGetPolygons( fp, cksize, &layer->polygon,
|
|
layer->point.offset ) ) {
|
|
goto Fail;
|
|
}
|
|
break;
|
|
|
|
case ID_VMAP:
|
|
case ID_VMAD:
|
|
node = ( lwNode * ) lwGetVMap( fp, cksize, layer->point.offset,
|
|
layer->polygon.offset, id == ID_VMAD );
|
|
if ( !node ) {
|
|
goto Fail;
|
|
}
|
|
lwListAdd( (void **) &layer->vmap, node );
|
|
layer->nvmaps++;
|
|
break;
|
|
|
|
case ID_PTAG:
|
|
if ( !lwGetPolygonTags( fp, cksize, &object->taglist,
|
|
&layer->polygon ) ) {
|
|
goto Fail;
|
|
}
|
|
break;
|
|
|
|
case ID_BBOX:
|
|
set_flen( 0 );
|
|
for ( i = 0; i < 6; i++ )
|
|
layer->bbox[ i ] = getF4( fp );
|
|
rlen = get_flen();
|
|
if ( rlen < 0 || rlen > cksize ) {
|
|
goto Fail;
|
|
}
|
|
if ( rlen < cksize ) {
|
|
_pico_memstream_seek( fp, cksize - rlen, PICO_SEEK_CUR );
|
|
}
|
|
break;
|
|
|
|
case ID_TAGS:
|
|
if ( !lwGetTags( fp, cksize, &object->taglist ) ) {
|
|
goto Fail;
|
|
}
|
|
break;
|
|
|
|
case ID_ENVL:
|
|
node = ( lwNode * ) lwGetEnvelope( fp, cksize );
|
|
if ( !node ) {
|
|
goto Fail;
|
|
}
|
|
lwListAdd( (void **) &object->env, node );
|
|
object->nenvs++;
|
|
break;
|
|
|
|
case ID_CLIP:
|
|
node = ( lwNode * ) lwGetClip( fp, cksize );
|
|
if ( !node ) {
|
|
goto Fail;
|
|
}
|
|
lwListAdd( (void **) &object->clip, node );
|
|
object->nclips++;
|
|
break;
|
|
|
|
case ID_SURF:
|
|
node = ( lwNode * ) lwGetSurface( fp, cksize );
|
|
if ( !node ) {
|
|
goto Fail;
|
|
}
|
|
lwListAdd( (void **) &object->surf, node );
|
|
object->nsurfs++;
|
|
break;
|
|
|
|
case ID_DESC:
|
|
case ID_TEXT:
|
|
case ID_ICON:
|
|
default:
|
|
_pico_memstream_seek( fp, cksize, PICO_SEEK_CUR );
|
|
break;
|
|
}
|
|
|
|
/* end of the file? */
|
|
|
|
if ( formsize <= (unsigned int) ( _pico_memstream_tell( fp ) - 8 ) ) {
|
|
break;
|
|
}
|
|
|
|
/* get the next chunk header */
|
|
|
|
set_flen( 0 );
|
|
id = getU4( fp );
|
|
cksize = getU4( fp );
|
|
if ( 8 != get_flen() ) {
|
|
goto Fail;
|
|
}
|
|
}
|
|
|
|
if ( object->nlayers == 0 ) {
|
|
object->nlayers = 1;
|
|
}
|
|
|
|
layer = object->layer;
|
|
while ( layer ) {
|
|
lwGetBoundingBox( &layer->point, layer->bbox );
|
|
lwGetPolyNormals( &layer->point, &layer->polygon );
|
|
if ( !lwGetPointPolygons( &layer->point, &layer->polygon ) ) {
|
|
goto Fail;
|
|
}
|
|
if ( !lwResolvePolySurfaces( &layer->polygon, &object->taglist,
|
|
&object->surf, &object->nsurfs ) ) {
|
|
goto Fail;
|
|
}
|
|
lwGetVertNormals( &layer->point, &layer->polygon );
|
|
if ( !lwGetPointVMaps( &layer->point, layer->vmap ) ) {
|
|
goto Fail;
|
|
}
|
|
if ( !lwGetPolyVMaps( &layer->polygon, layer->vmap ) ) {
|
|
goto Fail;
|
|
}
|
|
layer = layer->next;
|
|
}
|
|
|
|
return object;
|
|
|
|
Fail:
|
|
if ( failID ) {
|
|
*failID = id;
|
|
}
|
|
if ( fp ) {
|
|
if ( failpos ) {
|
|
*failpos = _pico_memstream_tell( fp );
|
|
}
|
|
}
|
|
lwFreeObject( object );
|
|
return NULL;
|
|
}
|
|
|
|
int lwValidateObject( const char *filename, picoMemStream_t *fp, unsigned int *failID, int *failpos ){
|
|
unsigned int id, type;
|
|
|
|
/* open the file */
|
|
|
|
if ( !fp ) {
|
|
return PICO_PMV_ERROR_MEMORY;
|
|
}
|
|
|
|
/* read the first 12 bytes */
|
|
|
|
set_flen( 0 );
|
|
id = getU4( fp );
|
|
/* formsize = */ getU4( fp );
|
|
type = getU4( fp );
|
|
if ( 12 != get_flen() ) {
|
|
return PICO_PMV_ERROR_SIZE;
|
|
}
|
|
|
|
/* is this a LW object? */
|
|
|
|
if ( id != ID_FORM ) {
|
|
if ( failpos ) {
|
|
*failpos = 12;
|
|
}
|
|
return PICO_PMV_ERROR_SIZE;
|
|
}
|
|
|
|
if ( type != ID_LWO2 ) {
|
|
if ( type == ID_LWOB ) {
|
|
return lwValidateObject5( filename, fp, failID, failpos );
|
|
}
|
|
else {
|
|
if ( failpos ) {
|
|
*failpos = 12;
|
|
}
|
|
return PICO_PMV_ERROR_IDENT;
|
|
}
|
|
}
|
|
|
|
return PICO_PMV_OK;
|
|
}
|