/*
======================================================================
lwo2.h

Definitions and typedefs for LWO2 files.

Ernie Wright  17 Sep 00
====================================================================== */

#ifndef LWO2_H
#define LWO2_H

/* chunk and subchunk IDs */

#define LWID_(a,b,c,d) (((a)<<24)|((b)<<16)|((c)<<8)|(d))

#define ID_FORM  LWID_('F','O','R','M')
#define ID_LWO2  LWID_('L','W','O','2')
#define ID_LWOB  LWID_('L','W','O','B')

/* top-level chunks */
#define ID_LAYR  LWID_('L','A','Y','R')
#define ID_TAGS  LWID_('T','A','G','S')
#define ID_PNTS  LWID_('P','N','T','S')
#define ID_BBOX  LWID_('B','B','O','X')
#define ID_VMAP  LWID_('V','M','A','P')
#define ID_VMAD  LWID_('V','M','A','D')
#define ID_POLS  LWID_('P','O','L','S')
#define ID_PTAG  LWID_('P','T','A','G')
#define ID_ENVL  LWID_('E','N','V','L')
#define ID_CLIP  LWID_('C','L','I','P')
#define ID_SURF  LWID_('S','U','R','F')
#define ID_DESC  LWID_('D','E','S','C')
#define ID_TEXT  LWID_('T','E','X','T')
#define ID_ICON  LWID_('I','C','O','N')

/* polygon types */
#define ID_FACE  LWID_('F','A','C','E')
#define ID_CURV  LWID_('C','U','R','V')
#define ID_PTCH  LWID_('P','T','C','H')
#define ID_MBAL  LWID_('M','B','A','L')
#define ID_BONE  LWID_('B','O','N','E')

/* polygon tags */
#define ID_SURF  LWID_('S','U','R','F')
#define ID_PART  LWID_('P','A','R','T')
#define ID_SMGP  LWID_('S','M','G','P')

/* envelopes */
#define ID_PRE   LWID_('P','R','E',' ')
#define ID_POST  LWID_('P','O','S','T')
#define ID_KEY   LWID_('K','E','Y',' ')
#define ID_SPAN  LWID_('S','P','A','N')
#define ID_TCB   LWID_('T','C','B',' ')
#define ID_HERM  LWID_('H','E','R','M')
#define ID_BEZI  LWID_('B','E','Z','I')
#define ID_BEZ2  LWID_('B','E','Z','2')
#define ID_LINE  LWID_('L','I','N','E')
#define ID_STEP  LWID_('S','T','E','P')

/* clips */
#define ID_STIL  LWID_('S','T','I','L')
#define ID_ISEQ  LWID_('I','S','E','Q')
#define ID_ANIM  LWID_('A','N','I','M')
#define ID_XREF  LWID_('X','R','E','F')
#define ID_STCC  LWID_('S','T','C','C')
#define ID_TIME  LWID_('T','I','M','E')
#define ID_CONT  LWID_('C','O','N','T')
#define ID_BRIT  LWID_('B','R','I','T')
#define ID_SATR  LWID_('S','A','T','R')
#define ID_HUE   LWID_('H','U','E',' ')
#define ID_GAMM  LWID_('G','A','M','M')
#define ID_NEGA  LWID_('N','E','G','A')
#define ID_IFLT  LWID_('I','F','L','T')
#define ID_PFLT  LWID_('P','F','L','T')

/* surfaces */
#define ID_COLR  LWID_('C','O','L','R')
#define ID_LUMI  LWID_('L','U','M','I')
#define ID_DIFF  LWID_('D','I','F','F')
#define ID_SPEC  LWID_('S','P','E','C')
#define ID_GLOS  LWID_('G','L','O','S')
#define ID_REFL  LWID_('R','E','F','L')
#define ID_RFOP  LWID_('R','F','O','P')
#define ID_RIMG  LWID_('R','I','M','G')
#define ID_RSAN  LWID_('R','S','A','N')
#define ID_TRAN  LWID_('T','R','A','N')
#define ID_TROP  LWID_('T','R','O','P')
#define ID_TIMG  LWID_('T','I','M','G')
#define ID_RIND  LWID_('R','I','N','D')
#define ID_TRNL  LWID_('T','R','N','L')
#define ID_BUMP  LWID_('B','U','M','P')
#define ID_SMAN  LWID_('S','M','A','N')
#define ID_SIDE  LWID_('S','I','D','E')
#define ID_CLRH  LWID_('C','L','R','H')
#define ID_CLRF  LWID_('C','L','R','F')
#define ID_ADTR  LWID_('A','D','T','R')
#define ID_SHRP  LWID_('S','H','R','P')
#define ID_LINE  LWID_('L','I','N','E')
#define ID_LSIZ  LWID_('L','S','I','Z')
#define ID_ALPH  LWID_('A','L','P','H')
#define ID_AVAL  LWID_('A','V','A','L')
#define ID_GVAL  LWID_('G','V','A','L')
#define ID_BLOK  LWID_('B','L','O','K')

/* texture layer */
#define ID_TYPE  LWID_('T','Y','P','E')
#define ID_CHAN  LWID_('C','H','A','N')
#define ID_NAME  LWID_('N','A','M','E')
#define ID_ENAB  LWID_('E','N','A','B')
#define ID_OPAC  LWID_('O','P','A','C')
#define ID_FLAG  LWID_('F','L','A','G')
#define ID_PROJ  LWID_('P','R','O','J')
#define ID_STCK  LWID_('S','T','C','K')
#define ID_TAMP  LWID_('T','A','M','P')

/* texture coordinates */
#define ID_TMAP  LWID_('T','M','A','P')
#define ID_AXIS  LWID_('A','X','I','S')
#define ID_CNTR  LWID_('C','N','T','R')
#define ID_SIZE  LWID_('S','I','Z','E')
#define ID_ROTA  LWID_('R','O','T','A')
#define ID_OREF  LWID_('O','R','E','F')
#define ID_FALL  LWID_('F','A','L','L')
#define ID_CSYS  LWID_('C','S','Y','S')

/* image map */
#define ID_IMAP  LWID_('I','M','A','P')
#define ID_IMAG  LWID_('I','M','A','G')
#define ID_WRAP  LWID_('W','R','A','P')
#define ID_WRPW  LWID_('W','R','P','W')
#define ID_WRPH  LWID_('W','R','P','H')
#define ID_VMAP  LWID_('V','M','A','P')
#define ID_AAST  LWID_('A','A','S','T')
#define ID_PIXB  LWID_('P','I','X','B')

/* procedural */
#define ID_PROC  LWID_('P','R','O','C')
#define ID_COLR  LWID_('C','O','L','R')
#define ID_VALU  LWID_('V','A','L','U')
#define ID_FUNC  LWID_('F','U','N','C')
#define ID_FTPS  LWID_('F','T','P','S')
#define ID_ITPS  LWID_('I','T','P','S')
#define ID_ETPS  LWID_('E','T','P','S')

/* gradient */
#define ID_GRAD  LWID_('G','R','A','D')
#define ID_GRST  LWID_('G','R','S','T')
#define ID_GREN  LWID_('G','R','E','N')
#define ID_PNAM  LWID_('P','N','A','M')
#define ID_INAM  LWID_('I','N','A','M')
#define ID_GRPT  LWID_('G','R','P','T')
#define ID_FKEY  LWID_('F','K','E','Y')
#define ID_IKEY  LWID_('I','K','E','Y')

/* shader */
#define ID_SHDR  LWID_('S','H','D','R')
#define ID_DATA  LWID_('D','A','T','A')


/* generic linked list */

typedef struct st_lwNode {
   struct st_lwNode *next, *prev;
   void *data;
} lwNode;


/* plug-in reference */

typedef struct st_lwPlugin {
   struct st_lwPlugin *next, *prev;
   char          *ord;
   char          *name;
   int            flags;
   void          *data;
} lwPlugin;


/* envelopes */

typedef struct st_lwKey {
   struct st_lwKey *next, *prev;
   float          value;
   float          time;
   unsigned int   shape;               /* ID_TCB, ID_BEZ2, etc. */
   float          tension;
   float          continuity;
   float          bias;
   float          param[ 4 ];
} lwKey;

typedef struct st_lwEnvelope {
   struct st_lwEnvelope *next, *prev;
   int            index;
   int            type;
   char          *name;
   lwKey         *key;                 /* linked list of keys */
   int            nkeys;
   int            behavior[ 2 ];       /* pre and post (extrapolation) */
   lwPlugin      *cfilter;             /* linked list of channel filters */
   int            ncfilters;
} lwEnvelope;

#define BEH_RESET      0
#define BEH_CONSTANT   1
#define BEH_REPEAT     2
#define BEH_OSCILLATE  3
#define BEH_OFFSET     4
#define BEH_LINEAR     5


/* values that can be enveloped */

typedef struct st_lwEParam {
   float          val;
   int            eindex;
} lwEParam;

typedef struct st_lwVParam {
   float          val[ 3 ];
   int            eindex;
} lwVParam;


/* clips */

typedef struct st_lwClipStill {
   char          *name;
} lwClipStill;

typedef struct st_lwClipSeq {
   char          *prefix;              /* filename before sequence digits */
   char          *suffix;              /* after digits, e.g. extensions */
   int            digits;
   int            flags;
   int            offset;
   int            start;
   int            end;
} lwClipSeq;

typedef struct st_lwClipAnim {
   char          *name;
   char          *server;              /* anim loader plug-in */
   void          *data;
} lwClipAnim;

typedef struct st_lwClipXRef {
   char          *string;
   int            index;
   struct st_lwClip *clip;
} lwClipXRef;

typedef struct st_lwClipCycle {
   char          *name;
   int            lo;
   int            hi;
} lwClipCycle;

typedef struct st_lwClip {
   struct st_lwClip *next, *prev;
   int            index;
   unsigned int   type;                /* ID_STIL, ID_ISEQ, etc. */
   union {
      lwClipStill    still;
      lwClipSeq      seq;
      lwClipAnim     anim;
      lwClipXRef     xref;
      lwClipCycle    cycle;
   }              source;
   float          start_time;
   float          duration;
   float          frame_rate;
   lwEParam       contrast;
   lwEParam       brightness;
   lwEParam       saturation;
   lwEParam       hue;
   lwEParam       gamma;
   int            negative;
   lwPlugin      *ifilter;             /* linked list of image filters */
   int            nifilters;
   lwPlugin      *pfilter;             /* linked list of pixel filters */
   int            npfilters;
} lwClip;


/* textures */

typedef struct st_lwTMap {
   lwVParam       size;
   lwVParam       center;
   lwVParam       rotate;
   lwVParam       falloff;
   int            fall_type;
   char          *ref_object;
   int            coord_sys;
} lwTMap;

typedef struct st_lwImageMap {
   int            cindex;
   int            projection;
   char          *vmap_name;
   int            axis;
   int            wrapw_type;
   int            wraph_type;
   lwEParam       wrapw;
   lwEParam       wraph;
   float          aa_strength;
   int            aas_flags;
   int            pblend;
   lwEParam       stck;
   lwEParam       amplitude;
} lwImageMap;

#define PROJ_PLANAR       0
#define PROJ_CYLINDRICAL  1
#define PROJ_SPHERICAL    2
#define PROJ_CUBIC        3
#define PROJ_FRONT        4

#define WRAP_NONE    0
#define WRAP_EDGE    1
#define WRAP_REPEAT  2
#define WRAP_MIRROR  3

typedef struct st_lwProcedural {
   int            axis;
   float          value[ 3 ];
   char          *name;
   void          *data;
} lwProcedural;

typedef struct st_lwGradKey {
   struct st_lwGradKey *next, *prev;
   float          value;
   float          rgba[ 4 ];
} lwGradKey;

typedef struct st_lwGradient {
   char          *paramname;
   char          *itemname;
   float          start;
   float          end;
   int            repeat;
   lwGradKey     *key;                 /* array of gradient keys */
   short         *ikey;                /* array of interpolation codes */
} lwGradient;

typedef struct st_lwTexture {
   struct st_lwTexture *next, *prev;
   char          *ord;
   unsigned int   type;
   unsigned int   chan;
   lwEParam       opacity;
   short          opac_type;
   short          enabled;
   short          negative;
   short          axis;
   union {
      lwImageMap     imap;
      lwProcedural   proc;
      lwGradient     grad;
   }              param;
   lwTMap         tmap;
} lwTexture;


/* values that can be textured */

typedef struct st_lwTParam {
   float          val;
   int            eindex;
   lwTexture     *tex;                 /* linked list of texture layers */
} lwTParam;

typedef struct st_lwCParam {
   float          rgb[ 3 ];
   int            eindex;
   lwTexture     *tex;                 /* linked list of texture layers */
} lwCParam;


/* surfaces */

typedef struct st_lwGlow {
   short          enabled;
   short          type;
   lwEParam       intensity;
   lwEParam       size;
} Glow;

typedef struct st_lwRMap {
   lwTParam       val;
   int            options;
   int            cindex;
   float          seam_angle;
} lwRMap;

typedef struct st_lwLine {
   short          enabled;
   unsigned short flags;
   lwEParam       size;
} lwLine;

typedef struct st_lwSurface {
   struct st_lwSurface *next, *prev;
   char          *name;
   char          *srcname;
   lwCParam       color;
   lwTParam       luminosity;
   lwTParam       diffuse;
   lwTParam       specularity;
   lwTParam       glossiness;
   lwRMap         reflection;
   lwRMap         transparency;
   lwTParam       eta;
   lwTParam       translucency;
   lwTParam       bump;
   float          smooth;
   int            sideflags;
   float          alpha;
   int            alpha_mode;
   lwEParam       color_hilite;
   lwEParam       color_filter;
   lwEParam       add_trans;
   lwEParam       dif_sharp;
   lwEParam       glow;
   lwLine         line;
   lwPlugin      *shader;              /* linked list of shaders */
   int            nshaders;
} lwSurface;


/* vertex maps */

typedef struct st_lwVMap {
   struct st_lwVMap *next, *prev;
   char          *name;
   unsigned int   type;
   int            dim;
   int            nverts;
   int            perpoly;
   int           *vindex;              /* array of point indexes */
   int           *pindex;              /* array of polygon indexes */
   float        **val;
} lwVMap;

typedef struct st_lwVMapPt {
   lwVMap        *vmap;
   int            index;               /* vindex or pindex element */
} lwVMapPt;


/* points and polygons */

typedef struct st_lwPoint {
   float          pos[ 3 ];
   int            npols;               /* number of polygons sharing the point */
   int           *pol;                 /* array of polygon indexes */
   int            nvmaps;
   lwVMapPt      *vm;                  /* array of vmap references */
} lwPoint;

typedef struct st_lwPolVert {
   int            index;               /* index into the point array */
   float          norm[ 3 ];
   int            nvmaps;
   lwVMapPt      *vm;                  /* array of vmap references */
} lwPolVert;

typedef struct st_lwPolygon {
   lwSurface     *surf;
   int            part;                /* part index */
   int            smoothgrp;           /* smoothing group */
   int            flags;
   unsigned int   type;
   float          norm[ 3 ];
   int            nverts;
   lwPolVert     *v;                   /* array of vertex records */
} lwPolygon;

typedef struct st_lwPointList {
   int            count;
   int            offset;              /* only used during reading */
   lwPoint       *pt;                  /* array of points */
} lwPointList;

typedef struct st_lwPolygonList {
   int            count;
   int            offset;              /* only used during reading */
   int            vcount;              /* total number of vertices */
   int            voffset;             /* only used during reading */
   lwPolygon     *pol;                 /* array of polygons */
} lwPolygonList;


/* geometry layers */

typedef struct st_lwLayer {
   struct st_lwLayer *next, *prev;
   char          *name;
   int            index;
   int            parent;
   int            flags;
   float          pivot[ 3 ];
   float          bbox[ 6 ];
   lwPointList    point;
   lwPolygonList  polygon;
   int            nvmaps;
   lwVMap        *vmap;                /* linked list of vmaps */
} lwLayer;


/* tag strings */

typedef struct st_lwTagList {
   int            count;
   int            offset;              /* only used during reading */
   char         **tag;                 /* array of strings */
} lwTagList;


/* an object */

typedef struct st_lwObject {
   lwLayer       *layer;               /* linked list of layers */
   lwEnvelope    *env;                 /* linked list of envelopes */
   lwClip        *clip;                /* linked list of clips */
   lwSurface     *surf;                /* linked list of surfaces */
   lwTagList      taglist;
   int            nlayers;
   int            nenvs;
   int            nclips;
   int            nsurfs;
} lwObject;


/* lwo2.c */

void lwFreeLayer( lwLayer *layer );
void lwFreeObject( lwObject *object );
lwObject *lwGetObject( const char *filename, picoMemStream_t *fp, unsigned int *failID, int *failpos );
int lwValidateObject( const char *filename, picoMemStream_t *fp, unsigned int *failID, int *failpos );

/* pntspols.c */

void lwFreePoints( lwPointList *point );
void lwFreePolygons( lwPolygonList *plist );
int lwGetPoints( picoMemStream_t *fp, int cksize, lwPointList *point );
void lwGetBoundingBox( lwPointList *point, float bbox[] );
int lwAllocPolygons( lwPolygonList *plist, int npols, int nverts );
int lwGetPolygons( picoMemStream_t *fp, int cksize, lwPolygonList *plist, int ptoffset );
void lwGetPolyNormals( lwPointList *point, lwPolygonList *polygon );
int lwGetPointPolygons( lwPointList *point, lwPolygonList *polygon );
int lwResolvePolySurfaces( lwPolygonList *polygon, lwTagList *tlist,
   lwSurface **surf, int *nsurfs );
void lwGetVertNormals( lwPointList *point, lwPolygonList *polygon );
void lwFreeTags( lwTagList *tlist );
int lwGetTags( picoMemStream_t *fp, int cksize, lwTagList *tlist );
int lwGetPolygonTags( picoMemStream_t *fp, int cksize, lwTagList *tlist,
   lwPolygonList *plist );

/* vmap.c */

void lwFreeVMap( lwVMap *vmap );
lwVMap *lwGetVMap( picoMemStream_t *fp, int cksize, int ptoffset, int poloffset,
   int perpoly );
int lwGetPointVMaps( lwPointList *point, lwVMap *vmap );
int lwGetPolyVMaps( lwPolygonList *polygon, lwVMap *vmap );

/* clip.c */

void lwFreeClip( lwClip *clip );
lwClip *lwGetClip( picoMemStream_t *fp, int cksize );
lwClip *lwFindClip( lwClip *list, int index );

/* envelope.c */

void lwFreeEnvelope( lwEnvelope *env );
lwEnvelope *lwGetEnvelope( picoMemStream_t *fp, int cksize );
lwEnvelope *lwFindEnvelope( lwEnvelope *list, int index );
float lwEvalEnvelope( lwEnvelope *env, float time );

/* surface.c */

void lwFreePlugin( lwPlugin *p );
void lwFreeTexture( lwTexture *t );
void lwFreeSurface( lwSurface *surf );
int lwGetTHeader( picoMemStream_t *fp, int hsz, lwTexture *tex );
int lwGetTMap( picoMemStream_t *fp, int tmapsz, lwTMap *tmap );
int lwGetImageMap( picoMemStream_t *fp, int rsz, lwTexture *tex );
int lwGetProcedural( picoMemStream_t *fp, int rsz, lwTexture *tex );
int lwGetGradient( picoMemStream_t *fp, int rsz, lwTexture *tex );
lwTexture *lwGetTexture( picoMemStream_t *fp, int bloksz, unsigned int type );
lwPlugin *lwGetShader( picoMemStream_t *fp, int bloksz );
lwSurface *lwGetSurface( picoMemStream_t *fp, int cksize );
lwSurface *lwDefaultSurface( void );

/* lwob.c */

lwSurface *lwGetSurface5( picoMemStream_t *fp, int cksize, lwObject *obj );
int lwGetPolygons5( picoMemStream_t *fp, int cksize, lwPolygonList *plist, int ptoffset );
lwObject *lwGetObject5( const char *filename, picoMemStream_t *fp, unsigned int *failID, int *failpos );
int lwValidateObject5( const char *filename, picoMemStream_t *fp, unsigned int *failID, int *failpos );

/* list.c */

void lwListFree( void *list, void ( *freeNode )( void * ));
void lwListAdd( void **list, void *node );
void lwListInsert( void **vlist, void *vitem,
   int ( *compare )( void *, void * ));

/* vecmath.c */

float dot( float a[], float b[] );
void cross( float a[], float b[], float c[] );
void normalize( float v[] );
#define vecangle( a, b ) ( float ) acos( dot( a, b ))

/* lwio.c */

void  set_flen( int i );
int   get_flen( void );
void *getbytes( picoMemStream_t *fp, int size );
void  skipbytes( picoMemStream_t *fp, int n );
int   getI1( picoMemStream_t *fp );
short getI2( picoMemStream_t *fp );
int   getI4( picoMemStream_t *fp );
unsigned char  getU1( picoMemStream_t *fp );
unsigned short getU2( picoMemStream_t *fp );
unsigned int   getU4( picoMemStream_t *fp );
int   getVX( picoMemStream_t *fp );
float getF4( picoMemStream_t *fp );
char *getS0( picoMemStream_t *fp );
int   sgetI1( unsigned char **bp );
short sgetI2( unsigned char **bp );
int   sgetI4( unsigned char **bp );
unsigned char  sgetU1( unsigned char **bp );
unsigned short sgetU2( unsigned char **bp );
unsigned int   sgetU4( unsigned char **bp );
int   sgetVX( unsigned char **bp );
float sgetF4( unsigned char **bp );
char *sgetS0( unsigned char **bp );

#ifndef __BIG_ENDIAN__
  void revbytes( void *bp, int elsize, int elcount );
#else
  #define revbytes( b, s, c )
#endif

#endif
