/**
 * @file models.c
 * @brief
 */

/*
Copyright (C) 1997-2001 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 the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/


#include "qdata.h"

/*================================================================= */

typedef struct
{
	int		numnormals;
	vec3_t	normalsum;
} vertexnormals_t;

typedef struct
{
	vec3_t		v;
	int			lightnormalindex;
} trivert_t;

typedef struct
{
	vec3_t		mins, maxs;
	char		name[16];
	trivert_t	v[MAX_VERTS];
} frame_t;

/*================================================================ */

frame_t		g_frames[MAX_FRAMES];

dmdl_t		model;


float		scale_up;			/* set by $scale */
vec3_t		adjust;				/* set by $origin */
int			g_fixedwidth, g_fixedheight;	/* set by $skinsize */


/* base frame info */
vec3_t		base_xyz[MAX_VERTS];
dstvert_t	base_st[MAX_VERTS];
dtriangle_t	triangles[MAX_TRIANGLES];

int			triangle_st[MAX_TRIANGLES][3][2];

/* the command list holds counts, s/t values, and xyz indexes */
/* that are valid for every frame */
int			commands[16384];
int			numcommands;
int			numglverts;
int			used[MAX_TRIANGLES];

char		g_skins[MAX_MD2SKINS][64];

char		cdarchive[1024];
char		cdpartial[1024];
char		cddir[1024];

char		modelname[64];	/* empty unless $modelname issued (players) */

#define NUMVERTEXNORMALS	162

float	avertexnormals[NUMVERTEXNORMALS][3] = {
#include "anorms.h"
};

FILE	*headerouthandle = NULL;

/*============================================================== */

/**
 * @brief
 */
void ClearModel (void)
{
	memset (&model, 0, sizeof(model));

	modelname[0] = 0;
	scale_up = 1.0;
	VectorCopy (vec3_origin, adjust);
	g_fixedwidth = g_fixedheight = 0;
	g_skipmodel = qfalse;
}


/**
 * @brief
 */
void H_printf(char *fmt, ...)
{
	va_list argptr;
	char	name[1024];

	if (!headerouthandle) {
		sprintf (name, "%s/tris.h", cddir);
		headerouthandle = SafeOpenWrite (name);
		fprintf(headerouthandle, "/* %s */\n\n", cddir);
		fprintf(headerouthandle, "/* This file generated by qdata - Do NOT Modify */\n\n");
	}

	va_start (argptr, fmt);
	vfprintf (headerouthandle, fmt, argptr);
	va_end (argptr);
}


/**
 * @brief
 */
void WriteModelFile (FILE *modelouthandle)
{
	int				i;
	dmdl_t			modeltemp;
	int				j, k;
	frame_t			*in;
	daliasframe_t	*out;
	byte			buffer[MAX_VERTS*4+128];
	float			v;
	int				c_on, c_off;

	model.ident = IDALIASHEADER;
	model.version = ALIAS_VERSION;
	model.framesize = (intptr_t)&((daliasframe_t *)0)->verts[model.num_xyz];
	model.num_glcmds = numcommands;
	model.ofs_skins = sizeof(dmdl_t);
	model.ofs_st = model.ofs_skins + model.num_skins * MAX_SKINNAME;
	model.ofs_tris = model.ofs_st + model.num_st*sizeof(dstvert_t);
	model.ofs_frames = model.ofs_tris + model.num_tris*sizeof(dtriangle_t);
	model.ofs_glcmds = model.ofs_frames + model.num_frames*model.framesize;
	model.ofs_end = model.ofs_glcmds + model.num_glcmds*4;

	/* write out the model header */
	for (i=0 ; i<sizeof(dmdl_t)/4 ; i++)
		((int *)&modeltemp)[i] = LittleLong (((int *)&model)[i]);

	SafeWrite (modelouthandle, &modeltemp, sizeof(modeltemp));

	/* write out the skin names */
	SafeWrite (modelouthandle, g_skins, model.num_skins * MAX_SKINNAME);

	/* write out the texture coordinates */
	c_on = c_off = 0;
	for (i=0 ; i<model.num_st ; i++) {
		base_st[i].s = LittleShort (base_st[i].s);
		base_st[i].t = LittleShort (base_st[i].t);
	}

	SafeWrite (modelouthandle, base_st, model.num_st * sizeof(base_st[0]));

	/* write out the triangles */
	for (i=0 ; i<model.num_tris ; i++) {
		int			j;
		dtriangle_t	tri;

		for (j=0 ; j<3 ; j++) {
			tri.index_xyz[j] = LittleShort (triangles[i].index_xyz[j]);
			tri.index_st[j] = LittleShort (triangles[i].index_st[j]);
		}

		SafeWrite (modelouthandle, &tri, sizeof(tri));
	}

	/* write out the frames */
	for (i=0 ; i<model.num_frames ; i++) {
		in = &g_frames[i];
		out = (daliasframe_t *)buffer;

		strcpy (out->name, in->name);
		for (j=0 ; j<3 ; j++) {
			out->scale[j] = (in->maxs[j] - in->mins[j])/255;
			out->translate[j] = in->mins[j];
		}

		for (j=0 ; j<model.num_xyz ; j++) {
			/* all of these are byte values, so no need to deal with endianness */
			out->verts[j].lightnormalindex = in->v[j].lightnormalindex;

			for (k=0 ; k<3 ; k++) {
				/* scale to byte values & min/max check */
				v = Q_rint ( (in->v[j].v[k] - out->translate[k]) / out->scale[k] );

				/* clamp, so rounding doesn't wrap from 255.6 to 0 */
				if (v > 255.0)
					v = 255.0;
				if (v < 0)
					v = 0;
				out->verts[j].v[k] = v;
			}
		}

		for (j=0 ; j<3 ; j++) {
			out->scale[j] = LittleFloat (out->scale[j]);
			out->translate[j] = LittleFloat (out->translate[j]);
		}

		SafeWrite (modelouthandle, out, model.framesize);
	}

	/* write out glcmds */
	SafeWrite (modelouthandle, commands, numcommands*4);
}


/**
 * @brief
 */
void FinishModel (void)
{
	FILE		*modelouthandle;
	int			i;
	char		name[1024];

	if (!model.num_frames)
		return;

	/* copy to release directory tree if doing a release build */
	if (g_release) {
		if (modelname[0])
			sprintf (name, "%s", modelname);
		else
			sprintf (name, "%s/tris.md2", cdpartial);
		ReleaseFile (name);

		for (i=0 ; i<model.num_skins ; i++) {
			ReleaseFile (g_skins[i]);
		}
		model.num_frames = 0;
		return;
	}

	/* write the model output file */
	if (modelname[0])
		sprintf (name, "%s%s", gamedir, modelname);
	else
		sprintf (name, "%s/tris.md2", cddir);
	printf ("saving to %s\n", name);
	CreatePath (name);
	modelouthandle = SafeOpenWrite (name);

	WriteModelFile (modelouthandle);

	printf ("%3dx%3d skin\n", model.skinwidth, model.skinheight);
	printf ("%4d vertexes\n", model.num_xyz);
	printf ("%4d triangles\n", model.num_tris);
	printf ("%4d frame\n", model.num_frames);
	printf ("%4d glverts\n", numglverts);
	printf ("%4d glcmd\n", model.num_glcmds);
	printf ("%4d skins\n", model.num_skins);
	printf ("file size: %d\n", (int)ftell (modelouthandle) );
	printf ("---------------------\n");

	fclose (modelouthandle);

	/* finish writing header file */
	H_printf("\n");

	/* scale_up is usefull to allow step distances to be adjusted */
	H_printf("#define MODEL_SCALE\t\t%f\n", scale_up);

	fclose (headerouthandle);
	headerouthandle = NULL;
}


/*
=================================================================
ALIAS MODEL DISPLAY LIST GENERATION
=================================================================
*/

int		strip_xyz[128];
int		strip_st[128];
int		strip_tris[128];
int		stripcount;

/**
 * @brief
 */
int	StripLength (int starttri, int startv)
{
	int			m1, m2;
	int			st1, st2;
	int			j;
	dtriangle_t	*last, *check;
	int			k;

	used[starttri] = 2;

	last = &triangles[starttri];

	strip_xyz[0] = last->index_xyz[(startv)%3];
	strip_xyz[1] = last->index_xyz[(startv+1)%3];
	strip_xyz[2] = last->index_xyz[(startv+2)%3];
	strip_st[0] = last->index_st[(startv)%3];
	strip_st[1] = last->index_st[(startv+1)%3];
	strip_st[2] = last->index_st[(startv+2)%3];

	strip_tris[0] = starttri;
	stripcount = 1;

	m1 = last->index_xyz[(startv+2)%3];
	st1 = last->index_st[(startv+2)%3];
	m2 = last->index_xyz[(startv+1)%3];
	st2 = last->index_st[(startv+1)%3];

	/* look for a matching triangle */
nexttri:
	for (j=starttri+1, check=&triangles[starttri+1]
		; j<model.num_tris ; j++, check++) {
		for (k=0 ; k<3 ; k++) {
			if (check->index_xyz[k] != m1)
				continue;
			if (check->index_st[k] != st1)
				continue;
			if (check->index_xyz[ (k+1)%3 ] != m2)
				continue;
			if (check->index_st[ (k+1)%3 ] != st2)
				continue;

			/* this is the next part of the fan */

			/* if we can't use this triangle, this tristrip is done */
			if (used[j])
				goto done;

			/* the new edge */
			if (stripcount & 1) {
				m2 = check->index_xyz[ (k+2)%3 ];
				st2 = check->index_st[ (k+2)%3 ];
			} else {
				m1 = check->index_xyz[ (k+2)%3 ];
				st1 = check->index_st[ (k+2)%3 ];
			}

			strip_xyz[stripcount+2] = check->index_xyz[ (k+2)%3 ];
			strip_st[stripcount+2] = check->index_st[ (k+2)%3 ];
			strip_tris[stripcount] = j;
			stripcount++;

			used[j] = 2;
			goto nexttri;
		}
	}
done:

	/* clear the temp used flags */
	for (j=starttri+1 ; j<model.num_tris ; j++)
		if (used[j] == 2)
			used[j] = 0;

	return stripcount;
}


/**
 * @brief
 */
int	FanLength (int starttri, int startv)
{
	int		m1, m2;
	int		st1, st2;
	int		j;
	dtriangle_t	*last, *check;
	int		k;

	used[starttri] = 2;

	last = &triangles[starttri];

	strip_xyz[0] = last->index_xyz[(startv)%3];
	strip_xyz[1] = last->index_xyz[(startv+1)%3];
	strip_xyz[2] = last->index_xyz[(startv+2)%3];
	strip_st[0] = last->index_st[(startv)%3];
	strip_st[1] = last->index_st[(startv+1)%3];
	strip_st[2] = last->index_st[(startv+2)%3];

	strip_tris[0] = starttri;
	stripcount = 1;

	m1 = last->index_xyz[(startv+0)%3];
	st1 = last->index_st[(startv+0)%3];
	m2 = last->index_xyz[(startv+2)%3];
	st2 = last->index_st[(startv+2)%3];


	/* look for a matching triangle */
nexttri:
	for (j=starttri+1, check=&triangles[starttri+1]
		; j<model.num_tris ; j++, check++) {
		for (k=0 ; k<3 ; k++) {
			if (check->index_xyz[k] != m1)
				continue;
			if (check->index_st[k] != st1)
				continue;
			if (check->index_xyz[ (k+1)%3 ] != m2)
				continue;
			if (check->index_st[ (k+1)%3 ] != st2)
				continue;

			/* this is the next part of the fan */

			/* if we can't use this triangle, this tristrip is done */
			if (used[j])
				goto done;

			/* the new edge */
			m2 = check->index_xyz[ (k+2)%3 ];
			st2 = check->index_st[ (k+2)%3 ];

			strip_xyz[stripcount+2] = m2;
			strip_st[stripcount+2] = st2;
			strip_tris[stripcount] = j;
			stripcount++;

			used[j] = 2;
			goto nexttri;
		}
	}
done:

	/* clear the temp used flags */
	for (j=starttri+1 ; j<model.num_tris ; j++)
		if (used[j] == 2)
			used[j] = 0;

	return stripcount;
}



/**
 * @brief Generate a list of trifans or strips for the model, which holds for all frames
 */
void BuildGlCmds (void)
{
	int		i, j, k;
	int		startv;
	float	s, t;
	int		len, bestlen, besttype = 0;
	int		best_xyz[1024];
	int		best_st[1024];
	int		best_tris[1024];
	int		type;

	/* build tristrips */
	numcommands = 0;
	numglverts = 0;
	memset (used, 0, sizeof(used));
	for (i=0 ; i<model.num_tris ; i++) {
		/* pick an unused triangle and start the trifan */
		if (used[i])
			continue;

		bestlen = 0;
		for (type = 0 ; type < 2 ; type++) {
			for (startv =0 ; startv < 3 ; startv++) {
				if (type == 1)
					len = StripLength (i, startv);
				else
					len = FanLength (i, startv);
				if (len > bestlen) {
					besttype = type;
					bestlen = len;
					for (j=0 ; j<bestlen+2 ; j++) {
						best_st[j] = strip_st[j];
						best_xyz[j] = strip_xyz[j];
					}
					for (j=0 ; j<bestlen ; j++)
						best_tris[j] = strip_tris[j];
				}
			}
		}

		/* mark the tris on the best strip/fan as used */
		for (j=0 ; j<bestlen ; j++)
			used[best_tris[j]] = 1;

		if (besttype == 1)
			commands[numcommands++] = (bestlen+2);
		else
			commands[numcommands++] = -(bestlen+2);

		numglverts += bestlen+2;

		for (j=0 ; j<bestlen+2 ; j++) {
			/* emit a vertex into the reorder buffer */
			k = best_st[j];

			/* emit s/t coords into the commands stream */
			s = base_st[k].s;
			t = base_st[k].t;

			s = (s + 0.5) / model.skinwidth;
			t = (t + 0.5) / model.skinheight;

			*(float *)&commands[numcommands++] = s;
			*(float *)&commands[numcommands++] = t;
			*(int *)&commands[numcommands++] = best_xyz[j];
		}
	}

	commands[numcommands++] = 0;		/* end of list marker */
}


/*
===============================================================
BASE FRAME SETUP
===============================================================
*/

/**
 * @brief Builds the triangle_st array for the base frame and model.skinwidth / model.skinheight
 * FIXME: allow this to be loaded from a file for arbitrary mappings
 */
void BuildST (triangle_t *ptri, int numtri)
{
	int			i, j;
	int			width, height, iwidth, iheight, swidth;
	float		basex, basey;
	float		s_scale, t_scale;
	float		scale;
	vec3_t		mins, maxs;
	float		*pbasevert;
	vec3_t		vtemp1, vtemp2, normal;

	/* find bounds of all the verts on the base frame */
	ClearBounds (mins, maxs);

	for (i=0 ; i<numtri ; i++)
		for (j=0 ; j<3 ; j++)
			AddPointToBounds (ptri[i].verts[j], mins, maxs);

	for (i=0 ; i<3 ; i++) {
		mins[i] = floor(mins[i]);
		maxs[i] = ceil(maxs[i]);
	}

	width = maxs[0] - mins[0];
	height = maxs[2] - mins[2];

	if (!g_fixedwidth) {	/* old style */
		scale = 8;
		if (width*scale >= 150)
			scale = 150.0 / width;
		if (height*scale >= 190)
			scale = 190.0 / height;

		s_scale = t_scale = scale;

		iwidth = ceil(width*s_scale);
		iheight = ceil(height*t_scale);

		iwidth += 4;
		iheight += 4;
	} else {	/* new style */
		iwidth = g_fixedwidth / 2;
		iheight = g_fixedheight;

		s_scale = (float)(iwidth-4) / width;
		t_scale = (float)(iheight-4) / height;
	}

	/* determine which side of each triangle to map the texture to */
	for (i=0 ; i<numtri ; i++) {
		VectorSubtract (ptri[i].verts[0], ptri[i].verts[1], vtemp1);
		VectorSubtract (ptri[i].verts[2], ptri[i].verts[1], vtemp2);
		CrossProduct (vtemp1, vtemp2, normal);

		if (normal[1] > 0) {
			basex = iwidth + 2;
		} else {
			basex = 2;
		}
		basey = 2;

		for (j=0 ; j<3 ; j++) {
			pbasevert = ptri[i].verts[j];

			triangle_st[i][j][0] = Q_rint((pbasevert[0] - mins[0]) * s_scale + basex);
			triangle_st[i][j][1] = Q_rint((maxs[2] - pbasevert[2]) * t_scale + basey);
		}
	}

	/* make the width a multiple of 4; some hardware requires this, and it ensures */
	/* dword alignment for each scan */
	swidth = iwidth*2;
	model.skinwidth = (swidth + 3) & ~3;
	model.skinheight = iheight;
}


/**
 * @brief
 */
void Cmd_Base (void)
{
	triangle_t	*ptri;
	int			i, j, k;
	int		time1;
	char	file1[1024];

	GetToken (qfalse);

	if (g_skipmodel || g_release || g_archive)
		return;

	printf ("---------------------\n");
	sprintf (file1, "%s/%s.%s", cdarchive, token, trifileext);
	printf ("%s\n", file1);

	ExpandPathAndArchive (file1);

	sprintf (file1, "%s/%s.%s", cddir, token, trifileext);

	time1 = FileTime (file1);
	if (time1 == -1)
		Error ("%s doesn't exist", file1);

	/* load the base triangles */
	if (do3ds)
		Load3DSTriangleList (file1, &ptri, &model.num_tris);
	else
		LoadTriangleList (file1, &ptri, &model.num_tris);

	/* get the ST values */
	BuildST (ptri, model.num_tris);

	/* run through all the base triangles, storing each unique vertex in the */
	/* base vertex list and setting the indirect triangles to point to the base */
	/* vertices */
	for (i=0 ; i<model.num_tris ; i++) {
		for (j=0 ; j<3 ; j++) {
			/* get the xyz index */
			for (k=0 ; k<model.num_xyz ; k++)
				if (VectorCompare (ptri[i].verts[j], base_xyz[k]))
					break;	/* this vertex is already in the base vertex list */

			if (k == model.num_xyz) { /* new index */
				VectorCopy (ptri[i].verts[j], base_xyz[model.num_xyz]);
				model.num_xyz++;
			}

			triangles[i].index_xyz[j] = k;

			/* get the st index */
			for (k=0 ; k<model.num_st ; k++)
				if (triangle_st[i][j][0] == base_st[k].s
				&& triangle_st[i][j][1] == base_st[k].t)
					break;	/* this vertex is already in the base vertex list */

			if (k == model.num_st) { /* new index */
				base_st[model.num_st].s = triangle_st[i][j][0];
				base_st[model.num_st].t = triangle_st[i][j][1];
				model.num_st++;
			}

			triangles[i].index_st[j] = k;
		}
	}

	/* build triangle strips / fans */
	BuildGlCmds ();
}

/**
 * @brief
 */
char *FindFrameFile (char *frame)
{
	int			time1;
	char	file1[1024];
	static char	retname[1024];
	char	base[32];
	char	suffix[32];
	char	*s;

	if (strstr (frame, "."))
		return frame;		/* allready in dot format */

	/* split 'run1' into 'run' and '1' */
	s = frame + strlen(frame)-1;

	while (s != frame && *s >= '0' && *s <= '9')
		s--;

	strcpy (suffix, s+1);
	strcpy (base, frame);
	base[s-frame+1] = 0;

	/* check for 'run1.tri' */
	sprintf (file1, "%s/%s%s.%s",cddir, base, suffix, trifileext);
	time1 = FileTime (file1);
	if (time1 != -1) {
		sprintf (retname, "%s%s.%s", base, suffix, trifileext);
		return retname;
	}

	/* check for 'run.1' */
	sprintf (file1, "%s/%s.%s",cddir, base, suffix);
	time1 = FileTime (file1);
	if (time1 != -1) {
		sprintf (retname, "%s.%s", base, suffix);
		return retname;
	}

	Error ("frame %s could not be found",frame);
	return NULL;
}

/**
 * @brief
 */
void GrabFrame (char *frame)
{
	triangle_t	*ptri;
	int			i, j;
	trivert_t	*ptrivert;
	int			num_tris;
	char		file1[1024];
	frame_t		*fr;
	vertexnormals_t	vnorms[MAX_VERTS];
	int		index_xyz;
	char	*framefile;

	/* the frame 'run1' will be looked for as either */
	/* run.1 or run1.tri, so the new alias sequence save */
	/* feature an be used */
	framefile = FindFrameFile (frame);

	sprintf (file1, "%s/%s", cdarchive, framefile);
	ExpandPathAndArchive (file1);

	sprintf (file1, "%s/%s",cddir, framefile);

	printf ("grabbing %s\n", file1);

	if (model.num_frames >= MAX_FRAMES)
		Error ("model.num_frames >= MAX_FRAMES");
	fr = &g_frames[model.num_frames];
	model.num_frames++;

	strcpy (fr->name, frame);

	/* load the frame */
	if (do3ds)
		Load3DSTriangleList (file1, &ptri, &num_tris);
	else
		LoadTriangleList (file1, &ptri, &num_tris);

	if (num_tris != model.num_tris)
		Error ("%s: number of triangles doesn't match base frame\n", file1);

	/* allocate storage for the frame's vertices */
	ptrivert = fr->v;

	for (i=0 ; i<model.num_xyz ; i++) {
		vnorms[i].numnormals = 0;
		VectorClear (vnorms[i].normalsum);
	}
	ClearBounds (fr->mins, fr->maxs);

	/* store the frame's vertices in the same order as the base. This assumes the */
	/* triangles and vertices in this frame are in exactly the same order as in the */
	/* base */
	for (i=0 ; i<num_tris ; i++) {
		vec3_t	vtemp1, vtemp2, normal;
		float	ftemp;

		VectorSubtract (ptri[i].verts[0], ptri[i].verts[1], vtemp1);
		VectorSubtract (ptri[i].verts[2], ptri[i].verts[1], vtemp2);
		CrossProduct (vtemp1, vtemp2, normal);

		VectorNormalize (normal, normal);

		/* rotate the normal so the model faces down the positive x axis */
		ftemp = normal[0];
		normal[0] = -normal[1];
		normal[1] = ftemp;

		for (j=0 ; j<3 ; j++) {
			index_xyz = triangles[i].index_xyz[j];

			/* rotate the vertices so the model faces down the positive x axis */
			/* also adjust the vertices to the desired origin */
			ptrivert[index_xyz].v[0] = ((-ptri[i].verts[j][1]) * scale_up) +
										adjust[0];
			ptrivert[index_xyz].v[1] = (ptri[i].verts[j][0] * scale_up) +
										adjust[1];
			ptrivert[index_xyz].v[2] = (ptri[i].verts[j][2] * scale_up) +
										adjust[2];

			AddPointToBounds (ptrivert[index_xyz].v, fr->mins, fr->maxs);

			VectorAdd (vnorms[index_xyz].normalsum, normal, vnorms[index_xyz].normalsum);
			vnorms[index_xyz].numnormals++;
		}
	}

	/* calculate the vertex normals, match them to the template list, and store the */
	/* index of the best match */
	for (i=0 ; i<model.num_xyz ; i++) {
		int		j;
		vec3_t	v;
		float	maxdot;
		int		maxdotindex;
		int		c;

		c = vnorms[i].numnormals;
		if (!c)
			Error ("Vertex with no triangles attached");

		VectorScale (vnorms[i].normalsum, 1.0/c, v);
		VectorNormalize (v, v);

		maxdot = -999999.0;
		maxdotindex = -1;

		for (j=0 ; j<NUMVERTEXNORMALS ; j++) {
			float	dot;

			dot = DotProduct (v, avertexnormals[j]);
			if (dot > maxdot)
			{
				maxdot = dot;
				maxdotindex = j;
			}
		}

		ptrivert[i].lightnormalindex = maxdotindex;
	}

	free (ptri);
}

/**
 * @brief
 */
void Cmd_Frame (void)
{
	while (TokenAvailable()) {
		GetToken (qfalse);
		if (g_skipmodel)
			continue;
		if (g_release || g_archive) {
			model.num_frames = 1;	/* don't skip the writeout */
			continue;
		}

		H_printf("#define FRAME_%-16s\t%i\n", token, model.num_frames);

		GrabFrame (token);
	}
}


/**
 * @brief Skins aren't actually stored in the file, only a reference is saved out to the header file.
 */
void Cmd_Skin (void)
{
	byte	*palette;
	byte	*pixels;
	int		width, height;
	byte	*cropped;
	int		y;
	char	name[1024], savename[1024];

	GetToken (qfalse);

	if (model.num_skins == MAX_MD2SKINS)
		Error ("model.num_skins == MAX_MD2SKINS");

	if (g_skipmodel)
		return;

	sprintf (name, "%s/%s.lbm", cdarchive, token);
	strcpy (name, ExpandPathAndArchive( name ) );
/*	sprintf (name, "%s/%s.lbm", cddir, token); */

	if (TokenAvailable()) {
		GetToken (qfalse);
		sprintf (g_skins[model.num_skins], "%s.pcx", token);
		sprintf (savename, "%s%s.pcx", gamedir, g_skins[model.num_skins]);
	} else {
		sprintf (savename, "%s/%s.pcx", cddir, token);
		sprintf (g_skins[model.num_skins], "%s/%s.pcx", cdpartial, token);
	}

	model.num_skins++;

	if (g_skipmodel || g_release || g_archive)
		return;

	/* load the image */
	printf ("loading %s\n", name);
	Load256Image (name, &pixels, &palette, &width, &height);
	RemapZero (pixels, palette, width, height);

	/* crop it to the proper size */
	cropped = malloc (model.skinwidth*model.skinheight);
	for (y=0 ; y<model.skinheight ; y++) {
		memcpy (cropped+y*model.skinwidth,
			pixels+y*width, model.skinwidth);
	}

	/* save off the new image */
	printf ("saving %s\n", savename);
	CreatePath (savename);
	WritePCXfile (savename, cropped, model.skinwidth,
		model.skinheight, palette);

	free (pixels);
	free (palette);
	free (cropped);
}


/**
 * @brief
 */
void Cmd_Origin (void)
{
	/* rotate points into frame of reference so model points down the */
	/* positive x axis */
	GetToken (qfalse);
	adjust[1] = -atof (token);

	GetToken (qfalse);
	adjust[0] = atof (token);

	GetToken (qfalse);
	adjust[2] = -atof (token);
}


/**
 * @brief
 */
void Cmd_ScaleUp (void)
{
	GetToken (qfalse);
	scale_up = atof (token);
	if (g_skipmodel || g_release || g_archive)
		return;

	printf ("Scale up: %f\n", scale_up);
}


/**
 * @brief Set a skin size other than the default
 */
void Cmd_Skinsize (void)
{
	GetToken (qfalse);
	g_fixedwidth = atoi(token);
	GetToken (qfalse);
	g_fixedheight = atoi(token);
}

/**
 * @brief Gives a different name/location for the file, instead of the cddir
 */
void Cmd_Modelname (void)
{
	GetToken (qfalse);
	strcpy (modelname, token);
}

/**
 * @brief
 */
void Cmd_Cd (void)
{
	FinishModel ();
	ClearModel ();

	GetToken (qfalse);

	/* this is a silly mess... */
	sprintf (cdpartial, "models/%s", token);
	sprintf (cdarchive, "%smodels/%s", gamedir+strlen(qdir), token);
	sprintf (cddir, "%s%s", gamedir, cdpartial);

	/* if -only was specified and this cd doesn't match, */
	/* skip the model (you only need to match leading chars, */
	/* so you could regrab all monsters with -only monsters) */
	if (!g_only[0])
		return;
	if (strncmp(token, g_only, strlen(g_only))) {
		g_skipmodel = qtrue;
		printf ("skipping %s\n", cdpartial);
	}
}