/* writelwob.c - write a LightWave3D object file
 *             - by traversing the TTDDDLIB database
 *             - written by Glenn M. Lewis - 8/7/92
 */

#include <stdio.h>
#include <ctype.h>
#include "t3dlib.h"
#ifdef __STDC__
#include <stdlib.h>
#include <strings.h>
#include "writelwob_protos.h"
#endif

#ifdef AZTEC_C
#include <fcntl.h>
#include <exec/types.h>
#endif

static void process_INFO();
static void process_OBJ();
static void process_EXTR();
static void process_DESC();

/* Here are a few necessary utilities */

static void put_name(world, name, size)
WORLD *world;
register char  *name;
register int size;
{
	while (*name && size) {
		fputc(*name++, world->inp);
		size--;
	}
	while (size--) fputc(0, world->inp);	/* Pad the rest of the string w/ 0 */
}

static void put_UBYTE(world, u)
WORLD *world;
UBYTE u;
{
	fputc((char)u, world->inp);
}

static void put_UWORD(world, w)
WORLD *world;
UWORD w;
{
	put_UBYTE(world, (UBYTE)(w>>8));
	put_UBYTE(world, (UBYTE)(w&0xFF));
}

static void put_ULONG(world, l)
WORLD *world;
ULONG l;
{
	put_UWORD(world, (UWORD)(l>>16));
	put_UWORD(world, (UWORD)(l&0xFFFF));
}

static void put_FRACT(world, f)
WORLD *world;
double f;
{
	union {			/* Nasty... pass it a double, get it as a ULONG */
		double f;
		ULONG l;
	} num;
	num.f = f;
	put_ULONG(world, num.l);
}

static void put_XYZ(world, st)			/* Write a common string */
WORLD *world;
XYZ_st *st;
{
	put_FRACT(world, st->x);
	put_FRACT(world, st->z);	/* Swap Y & Z for LightWave3D */
	put_FRACT(world, st->y);
}

static void put_RGB(world, st)			/* Write a common string */
WORLD *world;
RGB_st *st;
{
	put_UBYTE(world, 0);	/* PAD */
	put_UBYTE(world, st->r);
	put_UBYTE(world, st->g);
	put_UBYTE(world, st->b);
}

static void write_size(world, pos)
WORLD *world;
long pos;
{
	long size;
	long cur = ftell(world->inp);
	size = cur-pos;
	if (size&1) { size++; put_UBYTE(world, (UBYTE)0); }
	fseek(world->inp, pos-4L, 0);
	put_ULONG(world, (ULONG)size);
	fseek(world->inp, cur, 0);
}

/********************/
/* The MAIN section */
/********************/

int write_LWOB(world, myfile)
WORLD *world;
FILE *myfile;
{
	long pos, pos2;
	OBJECT *obj;

	if (!world || !myfile) return(0);
	world->inp = myfile;

	/* Start the IFF TDDD file */
	put_name(world, "FORM", 4);
	put_ULONG(world, 0L);			/* Fill this in later [seek(,4L,0)] */
	pos = ftell(world->inp);		/* Save where this starting position is */
	put_name(world, "LWOB", 4);

	/* First, write *all* of the points in the entire object, up to 64K */
	/* Swap the Y and Z values because of the changed axis orientation */
	put_name(world, "PNTS", 4);
	put_ULONG(world, 0L);
	pos2 = ftell(world->inp);	/* Save for later */
	for (obj=world->object; obj; obj=obj->next) {
		dump_points(world, obj);
	}
	write_size(world, pos2);

/* All done.  Close up shop. */
	write_size(world, pos);
	fclose(world->inp);
	return(1);
}

void dump_points(world, object)
WORLD *world;
register OBJECT *object;
{
	register int i;
	register XYZ_st *p;
	OBJECT *obj;

	if (object->desc && object->desc->pcount) {
		p = object->desc->pnts;
		for (i=object->desc->pcount; i--; p++)
			put_XYZ(world, p);
	}

	/* Process children */
	for (obj=object->child; obj; obj=obj->next)
		dump_points(world, obj);
}

static void process_INFO(world, info)
WORLD *world;
INFO *info;
{
	register ULONG i;
	long pos;

	put_name(world, "INFO", 4);
	put_ULONG(world, 0L);
	pos = ftell(world->inp);	/* Save for later */

	for (i=0; i<8; i++)
		if (info->brsh[i][0]) {
			put_name(world, "BRSH", 4);
			put_ULONG(world, 82L);
			put_UWORD(world, (UWORD)i);
			put_name(world, info->brsh[i], 80);
		}

	for (i=0; i<8; i++)
		if (info->stnc[i][0]) {
			put_name(world, "STNC", 4);
			put_ULONG(world, 82L);
			put_UWORD(world, (UWORD)i);
			put_name(world, info->stnc[i], 80);
		}

	for (i=0; i<8; i++)
		if (info->txtr[i][0]) {
			put_name(world, "TXTR", 4);
			put_ULONG(world, 82L);
			put_UWORD(world, (UWORD)i);
			put_name(world, info->txtr[i], 80);
		}

	if (info->otrk[0]) {
		put_name(world, "OTRK", 4);
		put_ULONG(world, 18L);
		put_name(world, info->otrk, 18);
	}

	if (info->ambi) {
		put_name(world, "AMBI", 4);
		put_ULONG(world, 4L);
		put_RGB(world, info->ambi);
	}

	if (info->obsv) {
		put_name(world, "OBSV", 4);
		put_ULONG(world, 28L);
		put_XYZ(world, &info->obsv->came);
		put_XYZ(world, &info->obsv->rota);
		put_FRACT(world, info->obsv->foca);
	}

	if (info->ostr) {
		put_name(world, "OSTR", 4);
		put_ULONG(world, 56L);
		put_name(world, info->ostr->path, 18);
		put_XYZ(world, &info->ostr->tran);
		put_XYZ(world, &info->ostr->rota);
		put_XYZ(world, &info->ostr->scal);
		put_UWORD(world, info->ostr->info);
	}

	if (info->fade) {
		put_name(world, "FADE", 4);
		put_ULONG(world, 12L);
		put_FRACT(world, info->fade->at);
		put_FRACT(world, info->fade->by);
		put_RGB(world, &info->fade->to);
	}

	if (info->skyc) {
		put_name(world, "SKYC", 4);
		put_ULONG(world, 8L);
		put_RGB(world, &info->skyc->hori);
		put_RGB(world, &info->skyc->zeni);
	}

	if (info->glb0) {
		put_name(world, "GLB0", 4);
		put_ULONG(world, 8L);
		for (i=0; i<8; i++)
			put_UBYTE(world, (UBYTE)info->glb0[i]);
	}
	write_size(world, pos);
}

static void process_OBJ(world, obj)
WORLD *world;
OBJECT *obj;
{
	OBJECT *o;

	if (obj->extr) process_EXTR(world, obj);
	else process_DESC(world, obj);

	for (o=obj->child; o; o=o->next)
		process_OBJ(world, o);

	put_name(world, "TOBJ", 4);
	put_ULONG(world, 0L);
}

static void process_EXTR(world, obj)
WORLD *world;
OBJECT *obj;
{
	long pos;

	put_name(world, "EXTR", 4);
	put_ULONG(world, 0L);
	pos = ftell(world->inp);	/* Save for later */

	put_name(world, "LOAD", 4);
	put_ULONG(world, 80L);
	put_name(world, obj->extr->filename, 80);

	put_name(world, "MTRX", 4);
	put_ULONG(world, 60L);
	put_XYZ(world, &obj->extr->mtrx.tran);
	put_XYZ(world, &obj->extr->mtrx.scal);
	put_XYZ(world, &obj->extr->mtrx.rota1);
	put_XYZ(world, &obj->extr->mtrx.rota2);
	put_XYZ(world, &obj->extr->mtrx.rota3);

	write_size(world, pos);
}

static void process_DESC(world, obj)
WORLD *world;
OBJECT *obj;
{
	register int i;
	register DESC *desc;
	FGRP *fgrp;
	long pos;

	if (!obj) return;
	desc = obj->desc;
	if (!desc) return;

	put_name(world, "DESC", 4);
	put_ULONG(world, 0L);
	pos = ftell(world->inp);	/* Save for later */

	if (desc->name) {
		put_name(world, "NAME", 4);
		put_ULONG(world, 18L);
		put_name(world, desc->name, 18);
	}

	if (desc->posi) {
		put_name(world, "POSI", 4);
		put_ULONG(world, 12L);
		put_XYZ(world, desc->posi);
	}

	if (desc->size) {
		put_name(world, "SIZE", 4);
		put_ULONG(world, 12L);
		put_XYZ(world, desc->size);
	}

	if (desc->colr) {
		put_name(world, "COLR", 4);
		put_ULONG(world, 4L);
		put_RGB(world, desc->colr);
	}

	if (desc->refl) {
		put_name(world, "REFL", 4);
		put_ULONG(world, 4L);
		put_RGB(world, desc->refl);
	}

	if (desc->tran) {
		put_name(world, "TRAN", 4);
		put_ULONG(world, 4L);
		put_RGB(world, desc->tran);
	}

	if (desc->spc1) {
		put_name(world, "SPC1", 4);
		put_ULONG(world, 4L);
		put_RGB(world, desc->spc1);
	}

	if (desc->ints) {
		put_name(world, "INTS", 4);
		put_ULONG(world, 4L);
		put_FRACT(world, (*desc->ints));
	}

	/* Mandatory field... stuff it, regardless */
	if (desc->shap) {
		put_name(world, "SHAP", 4);
		put_ULONG(world, 4L);
		put_UWORD(world, (UWORD)desc->shap[0]);
		put_UWORD(world, (UWORD)desc->shap[1]);
	} else {
		put_name(world, "SHAP", 4);
		put_ULONG(world, 4L);
		put_UWORD(world, (UWORD)2);
		put_UWORD(world, (UWORD)1);
	}

	if (desc->axis) {
		put_name(world, "AXIS", 4);
		put_ULONG(world, 36L);
		put_XYZ(world, &desc->axis->xaxi);
		put_XYZ(world, &desc->axis->yaxi);
		put_XYZ(world, &desc->axis->zaxi);
	}

	if (desc->tpar) {
		put_name(world, "TPAR", 4);
		put_ULONG(world, 64L);
		for (i=0; i<16; i++) put_FRACT(world, desc->tpar[i]);
	}

	if (desc->surf) {
		put_name(world, "SURF", 4);
		put_ULONG(world, 5L);
		for (i=0; i<5; i++) put_UBYTE(world, desc->surf[i]);
		put_UBYTE(world, (UBYTE)0);	/* To make this chunk even-sized */
	}

	if (desc->mttr) {
		put_name(world, "MTTR", 4);
		put_ULONG(world, 2L);
		put_UBYTE(world, desc->mttr->type);
		put_UBYTE(world, (UBYTE)(((int)((desc->mttr->indx-1.0)*100.0))&0xFF));
	}

	if (desc->spec) {
		put_name(world, "SPEC", 4);
		put_ULONG(world, 2L);
		put_UBYTE(world, desc->spec[0]);
		put_UBYTE(world, desc->spec[1]);
	}

	if (desc->prp0) {
		put_name(world, "PRP0", 4);
		put_ULONG(world, 6L);
		for (i=0; i<6; i++) put_UBYTE(world, desc->prp0[i]);
	}

	if (desc->prp1) {
		put_name(world, "PRP1", 4);
		put_ULONG(world, 8L);
		for (i=0; i<8; i++) put_UBYTE(world, desc->prp1[i]);
	}

	if (desc->stry) {
		put_name(world, "STRY", 4);
		put_ULONG(world, 56L);
		put_name(world, desc->stry->path, 18);
		put_XYZ(world, &desc->stry->tran);
		put_XYZ(world, &desc->stry->rota);
		put_XYZ(world, &desc->stry->scal);
		put_UWORD(world, desc->stry->info);
	}

	if (desc->pcount) {
		put_name(world, "PNTS", 4);
		put_ULONG(world, (ULONG)desc->pcount*12L+2L);
		put_UWORD(world, desc->pcount);
		for (i=0; i<desc->pcount; i++)
			put_XYZ(world, &desc->pnts[i]);
	}

	if (desc->ecount) {
		put_name(world, "EDGE", 4);
		put_ULONG(world, (ULONG)desc->ecount*4L+2L);
		put_UWORD(world, desc->ecount);
		for (i=0; i<2*desc->ecount; i++)
			put_UWORD(world, desc->edge[i]);
	}

	if (desc->eflg) {
		put_name(world, "EFLG", 4);
		put_ULONG(world, (ULONG)desc->eflg->num+2L);
		put_UWORD(world, desc->eflg->num);
		for (i=0; i<desc->eflg->num; i++)
			put_UBYTE(world, desc->eflg->eflg[i]);
		if (desc->eflg->num&1) put_UBYTE(world, 0);	/* Pad on even boundary */
	}

	if (desc->fcount) {
		put_name(world, "FACE", 4);
		put_ULONG(world, (ULONG)desc->fcount*6L+2L);
		put_UWORD(world, desc->fcount);
		for (i=0; i<3*desc->fcount; i++)
			put_UWORD(world, desc->face[i]);

		if (desc->clst) {
			put_name(world, "CLST", 4);
			put_ULONG(world, (ULONG)desc->fcount*3L+2L);
			put_UWORD(world, desc->fcount);
			for (i=0; i<3*desc->fcount; i++)
				put_UBYTE(world, desc->clst[i]);
			if (desc->fcount&1) put_UBYTE(world, 0);	/* Pad to even length */
		}
		if (desc->rlst) {
			put_name(world, "RLST", 4);
			put_ULONG(world, (ULONG)desc->fcount*3L+2L);
			put_UWORD(world, desc->fcount);
			for (i=0; i<3*desc->fcount; i++)
				put_UBYTE(world, desc->rlst[i]);
			if (desc->fcount&1) put_UBYTE(world, 0);	/* Pad to even length */
		}
		if (desc->tlst) {
			put_name(world, "TLST", 4);
			put_ULONG(world, (ULONG)desc->fcount*3L+2L);
			put_UWORD(world, desc->fcount);
			for (i=0; i<3*desc->fcount; i++)
				put_UBYTE(world, desc->tlst[i]);
			if (desc->fcount&1) put_UBYTE(world, 0);	/* Pad to even length */
		}
	}

	for (fgrp=desc->fgrp; fgrp; fgrp=fgrp->next) {
		put_name(world, "FGRP", 4);
		put_ULONG(world, (ULONG)fgrp->num*2L+2L+18L);
		put_UWORD(world, fgrp->num);
		put_name(world, fgrp->name, 18);
		for (i=0; i<fgrp->num; i++)
			put_UWORD(world, fgrp->face[i]);
	}
	write_size(world, pos);
}