/*
	cl_model.c

	model loading and caching

	Copyright (C) 1996-1997  Id Software, Inc.

	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

	See the GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

	$Id$
*/

// models are the only shared resource between a client and server running
// on the same machine.

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif

#include "QF/checksum.h"
#include "QF/model.h"
#include "QF/qendian.h"
#include "QF/sys.h"

#include "compat.h"
#include "d_iface.h"

extern char loadname[];
extern model_t *loadmodel;

/*
	ALIAS MODELS
*/

extern aliashdr_t *pheader;

extern stvert_t stverts[MAXALIASVERTS];
extern mtriangle_t triangles[MAXALIASTRIS];

// a pose is a single set of vertexes.  a frame may be
// an animating sequence of poses
extern trivertx_t *poseverts[MAXALIASFRAMES];
extern int  posenum;

void *
Mod_LoadSkin (byte * skin, int skinsize, int *pskinindex, int snum, int gnum)
{
	byte       *pskin;
	unsigned short *pusskin;
	int         i;

	pskin = Hunk_AllocName (skinsize * r_pixbytes, loadname);
	*pskinindex = (byte *) pskin - (byte *) pheader;

	switch (r_pixbytes) {
		case 1:
			memcpy (pskin, skin, skinsize);
			break;
		case 2:
			pusskin = (unsigned short *) skin;
			for (i = 0; i < skinsize; i++)
				pusskin[i] = d_8to16table[skin[i]];
			break;
		default:
			Sys_Error ("Mod_LoadAliasSkin: driver set invalid r_pixbytes: %d\n",
					  r_pixbytes);
			break;
	}
	return skin + skinsize;
}

/*
	Mod_LoadAllSkins
*/
void *
Mod_LoadAllSkins (int numskins, daliasskintype_t *pskintype, int *pskinindex)
{
	int         snum, gnum, t;
	int         skinsize;
	byte       *skin;
	int         groupskins;
	daliasskingroup_t *pinskingroup;
	daliasskininterval_t *pinskinintervals;
	maliasskindesc_t *pskindesc;
	maliasskingroup_t *paliasskingroup;
	float      *poutskinintervals;

	if (numskins < 1 || numskins > MAX_SKINS)
		Sys_Error ("Mod_LoadAliasModel: Invalid # of skins: %d\n", numskins);

	skinsize = pheader->mdl.skinwidth * pheader->mdl.skinheight;
	pskindesc = Hunk_AllocName (numskins * sizeof (maliasskindesc_t), loadname);

	pheader->skindesc = (byte *) pskindesc - (byte *) pheader;

	for (snum = 0; snum < numskins; snum++) {
		if (pskintype->type == ALIAS_SKIN_SINGLE) {
			skin = (byte *) (pskintype + 1);
			skin =
				Mod_LoadSkin (skin, skinsize, &pskindesc[snum].skin, snum, 0);
		} else {
			pskintype++;
			pinskingroup = (daliasskingroup_t *) pskintype;
			groupskins = LittleLong (pinskingroup->numskins);

			t = field_offset (maliasskingroup_t, skindescs[groupskins]);
			paliasskingroup = Hunk_AllocName (t, loadname);
			paliasskingroup->numskins = groupskins;

			*pskinindex = (byte *) paliasskingroup - (byte *) pheader;

			pinskinintervals = (daliasskininterval_t *) (pinskingroup + 1);
			poutskinintervals = Hunk_AllocName (groupskins * sizeof (float),
												loadname);
			paliasskingroup->intervals =
				(byte *) poutskinintervals - (byte *) pheader;
			for (gnum = 0; gnum < groupskins; gnum++) {
				*poutskinintervals = LittleFloat (pinskinintervals->interval);
				if (*poutskinintervals <= 0)
					Sys_Error ("Mod_LoadAliasSkinGroup: interval<=0");

				poutskinintervals++;
				pinskinintervals++;
			}

			pskintype = (void *) pinskinintervals;
			skin = (byte *) pskintype;

			for (gnum = 0; gnum < groupskins; gnum++) {
				skin =
					Mod_LoadSkin (skin, skinsize,
								  &paliasskingroup->skindescs[snum].skin, snum,
								  gnum);
			}
		}
		pskintype = (daliasskintype_t *) skin;
	}

	return pskintype;
}

void
GL_MakeAliasModelDisplayLists (model_t *m, aliashdr_t *hdr, void *_m, int _s)
{
	int         i, j;
	stvert_t   *pstverts;
	mtriangle_t *ptri;
	int         numv = hdr->mdl.numverts;
	int         numt = hdr->mdl.numtris;

	pstverts = (stvert_t *) Hunk_AllocName (numv * sizeof (stvert_t), loadname);
	ptri = (mtriangle_t *) Hunk_AllocName (numt * sizeof (mtriangle_t), loadname);

	hdr->stverts = (byte *) pstverts - (byte *) hdr;
	hdr->triangles = (byte *) ptri - (byte *) hdr;

	for (i = 0; i < numv; i++) {
		pstverts[i].onseam = stverts[i].onseam;
		pstverts[i].s = stverts[i].s << 16;
		pstverts[i].t = stverts[i].t << 16;
	}

	for (i = 0; i < numt; i++) {
		ptri[i].facesfront = triangles[i].facesfront;
		for (j = 0; j < 3; j++) {
			ptri[i].vertindex[j] = triangles[i].vertindex[j];
		}
	}
}

/*
	Mod_LoadAliasFrame
*/
void *
Mod_LoadAliasFrame (void *pin, maliasframedesc_t *frame)
{
	trivertx_t *pframe, *pinframe;
	int         i, j;
	daliasframe_t *pdaliasframe;

	pdaliasframe = (daliasframe_t *) pin;

	strcpy (frame->name, pdaliasframe->name);

	for (i = 0; i < 3; i++) {
		// byte values, don't worry about endianness
		frame->bboxmin.v[i] = pdaliasframe->bboxmin.v[i];
		frame->bboxmax.v[i] = pdaliasframe->bboxmax.v[i];
	}

	pinframe = (trivertx_t *) (pdaliasframe + 1);
	pframe = Hunk_AllocName (pheader->mdl.numverts * sizeof (*pframe), loadname);

	frame->frame = (byte *) pframe - (byte *) pheader;

	for (j = 0; j < pheader->mdl.numverts; j++) {
		int         k;

		// these are all byte values, so no need to deal with endianness
		pframe[j].lightnormalindex = pinframe[j].lightnormalindex;

		for (k = 0; k < 3; k++) {
			pframe[j].v[k] = pinframe[j].v[k];
		}
	}

	pinframe += pheader->mdl.numverts;

	return (void *) pinframe;
}


/*
	Mod_LoadAliasGroup
*/
void *
Mod_LoadAliasGroup (void *pin, maliasframedesc_t *frame)
{
	daliasgroup_t *pingroup;
	maliasgroup_t *paliasgroup;
	int         i, numframes;
	daliasinterval_t *pin_intervals;
	float      *poutintervals;
	void       *ptemp;

	pingroup = (daliasgroup_t *) pin;

	numframes = LittleLong (pingroup->numframes);

	paliasgroup = Hunk_AllocName (field_offset (maliasgroup_t,
												frames[numframes]), loadname);
	paliasgroup->numframes = numframes;

	for (i = 0; i < 3; i++) {
		// these are byte values, so we don't have to worry about endianness
		frame->bboxmin.v[i] = pingroup->bboxmin.v[i];
		frame->bboxmax.v[i] = pingroup->bboxmax.v[i];
	}

	frame->frame = (byte *) paliasgroup - (byte *) pheader;

	pin_intervals = (daliasinterval_t *) (pingroup + 1);

	poutintervals = Hunk_AllocName (numframes * sizeof (float), loadname);

	paliasgroup->intervals = (byte *) poutintervals - (byte *) pheader;

	for (i = 0; i < numframes; i++) {
		*poutintervals = LittleFloat (pin_intervals->interval);
		if (*poutintervals <= 0.0)
			Sys_Error ("Mod_LoadAliasGroup: interval<=0");

		poutintervals++;
		pin_intervals++;
	}

	ptemp = (void *) pin_intervals;

	for (i = 0; i < numframes; i++) {
		maliasframedesc_t temp_frame;
		ptemp = Mod_LoadAliasFrame (ptemp, &temp_frame);
		memcpy (&paliasgroup->frames[i], &temp_frame,
				sizeof(paliasgroup->frames[i]));
	}

	return ptemp;
}