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

*/
// model.c -- model loading and caching

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

#include "quakedef.h"

extern	cvar_t	*gl_glowmap;	// 1999-12-28 OpenGL fullbright fix by Neal White III
#ifdef QSB
#define	MAX_MOD_KNOWN	4096
#else
#define	MAX_MOD_KNOWN	512
#endif
model_t	mod_known[MAX_MOD_KNOWN];
int		mod_numknown;

/*
===================
Mod_ClearAll
===================
*/
void Mod_ClearAll (void)
{
	int		i;
	model_t	*mod;

	for (i=0 , mod=mod_known ; i<mod_numknown ; i++, mod++)
		if (mod->type != mod_alias)
			mod->needload = true;
}

/*
==================
Mod_FindName

==================
*/
model_t *Mod_FindName (char *name)
{
	int		i;
	model_t	*mod;

	if (!name[0])
		Sys_Error ("Mod_ForName: NULL name");

//
// search the currently loaded models
//
	for (i=0 , mod=mod_known ; i<mod_numknown ; i++, mod++)
		if (!strcmp (mod->name, name) )
			break;

	if (i == mod_numknown)
	{
		if (mod_numknown == MAX_MOD_KNOWN)
			Sys_Error ("mod_numknown == MAX_MOD_KNOWN");
		strcpy (mod->name, name);
		mod->needload = true;
		mod_numknown++;
	}

	return mod;
}

/*
==================
Mod_TouchModel

==================
*/
void Mod_TouchModel (char *name)
{
	model_t	*mod;

	mod = Mod_FindName (name);

	if (!mod->needload)
	{
		if (mod->type == mod_alias)
			Cache_Check (&mod->cache);
	}
}

/*
==================
Mod_LoadModel

Loads a model into the cache
==================
*/
model_t *Mod_LoadModel (model_t *mod, qboolean crash)
{
	void		*d;
	unsigned	*buf;
	byte		stackbuf[1024];	// avoid dirtying the cache heap
	loadedfile_t	*fileinfo;	// 2001-09-12 Returning information about loaded file by Maddes

	if (!mod->needload)
	{
		if (mod->type == mod_alias)
		{
			d = Cache_Check (&mod->cache);
			if (d)
				return mod;
		}
		else
			return mod;		// not cached at all
	}

//
// because the world is so huge, load it one piece at a time
//
	if (!crash)
	{

	}

//
// load the file
//
// 2001-09-12 Returning information about loaded file by Maddes  start
/*
	buf = (unsigned *)COM_LoadStackFile (mod->name, stackbuf, sizeof(stackbuf));
	if (!buf)
*/
	fileinfo = COM_LoadStackFile (mod->name, stackbuf, sizeof(stackbuf));
	if (!fileinfo)
// 2001-09-12 Returning information about loaded file by Maddes  end
	{
		if (crash)
			Sys_Error ("Mod_NumForName: %s not found", mod->name);
		return NULL;
	}
	buf = (unsigned *)fileinfo->data;	// 2001-09-12 Returning information about loaded file by Maddes

//
// allocate a new model
//
	COM_FileBase (mod->name, loadname);

	loadmodel = mod;

//
// fill it in
//

// call the apropriate loader
	mod->needload = false;

	switch (LittleLong(*(unsigned *)buf))
	{
	case IDPOLYHEADER:
		Mod_LoadAliasModel (mod, buf);
		break;

	case IDSPRITEHEADER:
		Mod_LoadSpriteModel (mod, buf);
		break;

	default:
		Mod_LoadBrushModel (mod, buf, fileinfo);	// 2001-09-12 .ENT support by Maddes
		break;
	}

	return mod;
}


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

					BRUSHMODEL LOADING

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

/*
=================
Mod_LoadTextures
=================
*/
void Mod_LoadTextures (lump_t *l)
{
// 1999-12-28 OpenGL fullbright fix by Neal White III  start
	// Neal White III - 12-28-1999 - OpenGL fullbright bugfix
	// nwhite@softblox.com
	// http://home.telefragged.com/wally/
	//
	// Problem:
	//
	// There was a problem in the original glquake with fullbright texels.
	// In the software renderer, fullbrights glow brightly in the dark.
	// Essentially, the fullbrights were ignored.  I've fixed it by
	// adding another rendering pass and creating a new glowmap texture.
	//
	// Fix:
	//
	// When a texture with fullbright (FB) texels is loaded, a copy is made,
	// then the FB pixels are cleared to black in the original texture.  In
	// the copy, all normal colors are cleared and only the FBs remain.  When
	// it comes time to render the polygons, I do an additional pass and ADD
	// the glowmap on top of the current polygon.

	byte		*ptexel;
	qboolean	hasfullbrights;
//	qboolean	noglow = COM_CheckParm("-noglow");

//	int		i, j, pixels, num, max, altmax;
	int		i, num, max, altmax;
	unsigned long	j, pixels;
// 1999-12-28 OpenGL fullbright fix by Neal White III  end

	miptex_t	*mt;
	texture_t	*tx, *tx2;
	texture_t	*anims[10];
	texture_t	*altanims[10];
	dmiptexlump_t *m;

	if (!l->filelen)
	{
		loadmodel->textures = NULL;
		return;
	}
	m = (dmiptexlump_t *)(mod_base + l->fileofs);

	m->nummiptex = LittleLong (m->nummiptex);

	loadmodel->numtextures = m->nummiptex;
	loadmodel->textures = Hunk_AllocName (m->nummiptex * sizeof(*loadmodel->textures) , loadname);

	for (i=0 ; i<m->nummiptex ; i++)
	{
		m->dataofs[i] = LittleLong(m->dataofs[i]);
		if (m->dataofs[i] == -1)
			continue;
		mt = (miptex_t *)((byte *)m + m->dataofs[i]);
		mt->width = LittleLong (mt->width);
		mt->height = LittleLong (mt->height);
		for (j=0 ; j<MIPLEVELS ; j++)
			mt->offsets[j] = LittleLong (mt->offsets[j]);

		if ( (mt->width & 15) || (mt->height & 15) )
			Sys_Error ("Texture %s is not 16 aligned", mt->name);
		pixels = mt->width*mt->height/64*85;

// 1999-12-28 OpenGL fullbright fix by Neal White III  start
		hasfullbrights = false;

		if ((!strncmp(mt->name,"sky",3)) ||
				(!strncmp(mt->name,"*",1)) || 	// turbulent (liquid)
				(!gl_glowmap->value) || (! gl_mtexable) )
		{
			// sky has no lightmap, nor do liquids (so never needs a glowmap),
			// -noglow command line parameter, or no multi-texture support
			//
			// hasfullbrights is already false
		}
		else					// check this texture for fullbright texels
		{
			ptexel = (byte *)(mt+1);

			for (j=0 ; j<pixels ; j++)
			{
				if (ptexel[j] >= 256-32)	// 32 fullbright colors
				{
					hasfullbrights = true;
					break;
				}
			}
		}

		if (hasfullbrights)
		{
			tx = Hunk_AllocName (sizeof(texture_t) +pixels*2, loadname );
		}
		else
		{
// 1999-12-28 OpenGL fullbright fix by Neal White III  end
			tx = Hunk_AllocName (sizeof(texture_t) +pixels, loadname );
		}	// 1999-12-28 OpenGL fullbright fix by Neal White III

		loadmodel->textures[i] = tx;

		memcpy (tx->name, mt->name, sizeof(tx->name));
		tx->width = mt->width;
		tx->height = mt->height;
		for (j=0 ; j<MIPLEVELS ; j++)
		{	// 1999-12-28 OpenGL fullbright fix by Neal White III
			tx->offsets[j] = mt->offsets[j] + sizeof(texture_t) - sizeof(miptex_t);
// 1999-12-28 OpenGL fullbright fix by Neal White III  start
			if (hasfullbrights)
			{
				tx->glowoffsets[j] = mt->offsets[j] + sizeof(texture_t) - sizeof(miptex_t) + pixels;
			}
			else
			{
				tx->glowoffsets[j] = 0;
			}
		}
// 1999-12-28 OpenGL fullbright fix by Neal White III  end

		// the pixels immediately follow the structures
		memcpy ( tx+1, mt+1, pixels);

// 1999-12-28 OpenGL fullbright fix by Neal White III  start
		if (hasfullbrights)
		{
			ptexel = (byte *)(tx+1);
			memcpy ( ptexel+pixels, mt+1, pixels);
		}

		tx->flags = 0;
// 1999-12-28 OpenGL fullbright fix by Neal White III  end

		if (!strncmp(mt->name,"sky",3))
// 2000-07-09 Dedicated server bug in GLQuake fix by Nathan Cline  start
		{
			if (cls.state != ca_dedicated)
			{
// 2000-07-09 Dedicated server bug in GLQuake fix by Nathan Cline  end
				R_InitSky (tx);
// 2000-07-09 Dedicated server bug in GLQuake fix by Nathan Cline  start
			}
		}
// 2000-07-09 Dedicated server bug in GLQuake fix by Nathan Cline  end
		else
		{
			texture_mode = GL_LINEAR_MIPMAP_NEAREST; //_LINEAR;
// 1999-12-28 OpenGL fullbright fix by Neal White III  start
			// remove glowing fullbright colors from base texture (make black)
			if (hasfullbrights)
			{
#ifdef _DEBUG
				qboolean	bColorUsed[256];
				Con_DPrintf ("*** Fullbright Texture: \"%s\", %dx%d, %d pixels\n", mt->name, mt->width, mt->height, pixels);
				for (j=0 ; j<256 ; j++) bColorUsed[j] = false;
#endif

				ptexel = (byte *)(tx+1);

				for (j=0 ; j<pixels ; j++)
				{
#ifdef _DEBUG
					bColorUsed[ptexel[j]] = true;
#endif

					if (ptexel[j] >= 256-32)	// 32 fullbright colors
					{
						ptexel[j] = 0;		// make fullbrights black
					}
				}

#ifdef _DEBUG
				Con_DPrintf ("*** Normal colors: ");
				for (j=0 ; j<256-32 ; j++)
				{
					if (bColorUsed[j])
						Con_DPrintf ("%d ", j);
				}
				Con_DPrintf ("\n");

				Con_DPrintf ("*** Fullbrights: ");
				for (j=256-32 ; j<256 ; j++)
				{
					if (bColorUsed[j])
						Con_DPrintf ("%d ", j);
				}
				Con_DPrintf ("\n");
#endif
			}
#ifdef _DEBUG
			else
			{
				Con_DPrintf ("*** Normal Texture: \"%s\", %dx%d\n", mt->name, mt->width, mt->height);
			}
#endif
// 1999-12-28 OpenGL fullbright fix by Neal White III  end
			tx->gl_texturenum = GL_LoadTexture (mt->name, tx->width, tx->height, (byte *)(tx+1), true, false);
// 1999-12-28 OpenGL fullbright fix by Neal White III  start
			// create glowmap texture (all black except for glowing fullbright colors)
			if (hasfullbrights)
			{
#ifdef _DEBUG
				qboolean bGlowDoubleCheck = false;
#endif
				char glowname[32];
				memcpy (glowname, mt->name, sizeof(mt->name));

				glowname[16] = '\0';
				for (j=0 ; glowname[j] != '\0'; j++)
					;
				glowname[j++] = '<';
				glowname[j++] = 'G';
				glowname[j++] = 'L';
				glowname[j++] = 'O';
				glowname[j++] = 'W';
				glowname[j++] = '>';
				glowname[j++] = '\0';

				ptexel = (byte *)(tx+1) + pixels;

				for (j=0 ; j<pixels ; j++)
				{
					if (ptexel[j] < 256-32)		// build glowmap
					{
						ptexel[j] = 0;			// make non-fullbrights black
					}
#ifdef _DEBUG
					else
					{
						bGlowDoubleCheck = true;
					}
#endif
				}
				tx->gl_glowtexnum = GL_LoadTexture (glowname, tx->width, tx->height, ptexel, true, false);
				tx->flags |= FLAG_HAS_GLOWMAP;

#ifdef _DEBUG
				if (! bGlowDoubleCheck)
					Con_DPrintf ("INTERNAL ERROR: Mod_LoadTextures - FullBright texture \"%s\" has no FullBright colors!\n", glowname);
#endif
			}
// 1999-12-28 OpenGL fullbright fix by Neal White III  end
			texture_mode = GL_LINEAR;
		}
	}

//
// sequence the animations
//
	for (i=0 ; i<m->nummiptex ; i++)
	{
		tx = loadmodel->textures[i];
		if (!tx || tx->name[0] != '+')
			continue;
		if (tx->anim_next)
			continue;	// already sequenced

	// find the number of frames in the animation
		memset (anims, 0, sizeof(anims));
		memset (altanims, 0, sizeof(altanims));

		max = tx->name[1];
		altmax = 0;
		if (max >= 'a' && max <= 'z')
			max -= 'a' - 'A';
		if (max >= '0' && max <= '9')
		{
			max -= '0';
			altmax = 0;
			anims[max] = tx;
			max++;
		}
		else if (max >= 'A' && max <= 'J')
		{
			altmax = max - 'A';
			max = 0;
			altanims[altmax] = tx;
			altmax++;
		}
		else
			Sys_Error ("Bad animating texture %s", tx->name);

		for (j=i+1 ; j<m->nummiptex ; j++)
		{
			tx2 = loadmodel->textures[j];
			if (!tx2 || tx2->name[0] != '+')
				continue;
			if (strcmp (tx2->name+2, tx->name+2))
				continue;

			num = tx2->name[1];
			if (num >= 'a' && num <= 'z')
				num -= 'a' - 'A';
			if (num >= '0' && num <= '9')
			{
				num -= '0';
				anims[num] = tx2;
				if (num+1 > max)
					max = num + 1;
			}
			else if (num >= 'A' && num <= 'J')
			{
				num = num - 'A';
				altanims[num] = tx2;
				if (num+1 > altmax)
					altmax = num+1;
			}
			else
				Sys_Error ("Bad animating texture %s", tx->name);
		}

#define	ANIM_CYCLE	2
	// link them all together
		for (j=0 ; j<max ; j++)
		{
			tx2 = anims[j];
			if (!tx2)
				Sys_Error ("Missing frame %i of %s",j, tx->name);
			tx2->anim_total = max * ANIM_CYCLE;
			tx2->anim_min = j * ANIM_CYCLE;
			tx2->anim_max = (j+1) * ANIM_CYCLE;
			tx2->anim_next = anims[ (j+1)%max ];
			if (altmax)
				tx2->alternate_anims = altanims[0];
		}
		for (j=0 ; j<altmax ; j++)
		{
			tx2 = altanims[j];
			if (!tx2)
				Sys_Error ("Missing frame %i of %s",j, tx->name);
			tx2->anim_total = altmax * ANIM_CYCLE;
			tx2->anim_min = j * ANIM_CYCLE;
			tx2->anim_max = (j+1) * ANIM_CYCLE;
			tx2->anim_next = altanims[ (j+1)%altmax ];
			if (max)
				tx2->alternate_anims = anims[0];
		}
	}
}

/*
=================
Mod_LoadLighting
=================
*/
void Mod_LoadLighting (lump_t *l)
{
// 2001-09-11 Colored lightning by LordHavoc/Sarcazm/Maddes  start
/*
	if (!l->filelen)
	{
		loadmodel->lightdata = NULL;
		return;
	}
	loadmodel->lightdata = Hunk_AllocName ( l->filelen, loadname);
	memcpy (loadmodel->lightdata, mod_base + l->fileofs, l->filelen);
*/
	int		i;
	byte	*in, *out, *data;
	byte	d;
	char	litfilename[1024];
	loadedfile_t	*fileinfo;	// 2001-09-12 Returning information about loaded file by Maddes

	loadmodel->lightdata = NULL;

	if (external_lit->value)
	{
		// check for a .LIT file
		strcpy(litfilename, loadmodel->name);
		COM_StripExtension(litfilename, litfilename);
		strcat(litfilename, ".lit");

// 2001-09-12 Returning information about loaded file by Maddes  start
/*
		data = (byte*) COM_LoadHunkFile(litfilename);
		if (data)
*/
		fileinfo = COM_LoadHunkFile(litfilename);
		if (fileinfo)
// 2001-09-12 Returning information about loaded file by Maddes  end
		{
			Con_DPrintf("%s loaded from %s\n", litfilename, fileinfo->path->pack ? fileinfo->path->pack->filename : fileinfo->path->filename);	// 2001-09-12 Displaying where .LIT file is loaded from by Maddes
			data = fileinfo->data;	// 2001-09-12 Returning information about loaded file by Maddes
			if (data[0] == 'Q' && data[1] == 'L' && data[2] == 'I' && data[3] == 'T')
			{
				i = LittleLong(((int *)data)[1]);
				if (i == 1)
				{
					loadmodel->lightdata = data + 8;
					return;
				}
				else
					Con_Printf("Unknown .LIT file version (%d)\n", i);
			}
			else
				Con_Printf("Corrupt .LIT file (old version?), ignoring\n");
		}

		// no .LIT found, expand the white lighting data to color
	}

	if (!l->filelen)
		return;
	loadmodel->lightdata = Hunk_AllocName ( l->filelen*3, loadname);
	in = loadmodel->lightdata + l->filelen*2; // place the file at the end, so it will not be overwritten until the very last write
	out = loadmodel->lightdata;
	memcpy (in, mod_base + l->fileofs, l->filelen);
	for (i = 0;i < l->filelen;i++)
	{
		d = *in++;
		*out++ = d;
		*out++ = d;
		*out++ = d;
	}
// 2001-09-11 Colored lightning by LordHavoc/Sarcazm/Maddes  end
}

/*
================
CalcSurfaceExtents

Fills in s->texturemins[] and s->extents[]
================
*/
void CalcSurfaceExtents (msurface_t *s)
{
	float	mins[2], maxs[2], val;
	int		i,j, e;
	mvertex_t	*v;
	mtexinfo_t	*tex;
	int		bmins[2], bmaxs[2];

	mins[0] = mins[1] = 999999;
	maxs[0] = maxs[1] = -99999;

	tex = s->texinfo;

	for (i=0 ; i<s->numedges ; i++)
	{
		e = loadmodel->surfedges[s->firstedge+i];
		if (e >= 0)
			v = &loadmodel->vertexes[loadmodel->edges[e].v[0]];
		else
			v = &loadmodel->vertexes[loadmodel->edges[-e].v[1]];

		for (j=0 ; j<2 ; j++)
		{
			val = v->position[0] * tex->vecs[j][0] +
				v->position[1] * tex->vecs[j][1] +
				v->position[2] * tex->vecs[j][2] +
				tex->vecs[j][3];
			if (val < mins[j])
				mins[j] = val;
			if (val > maxs[j])
				maxs[j] = val;
		}
	}

	for (i=0 ; i<2 ; i++)
	{
		bmins[i] = floor(mins[i]/16);
		bmaxs[i] = ceil(maxs[i]/16);

		s->texturemins[i] = bmins[i] * 16;
		s->extents[i] = (bmaxs[i] - bmins[i]) * 16;
		if ( !(tex->flags & TEX_SPECIAL) && s->extents[i] > 512 /* 256 */ )
			Sys_Error ("Bad surface extents");
	}
}


/*
=================
Mod_LoadFaces
=================
*/
void Mod_LoadFaces (lump_t *l)
{
	dface_t		*in;
	msurface_t 	*out;
	int			i, count, surfnum;
	int			planenum, side;

	in = (void *)(mod_base + l->fileofs);
	if (l->filelen % sizeof(*in))
		Sys_Error ("MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
	count = l->filelen / sizeof(*in);
	out = Hunk_AllocName ( count*sizeof(*out), loadname);

	loadmodel->surfaces = out;
	loadmodel->numsurfaces = count;

	for ( surfnum=0 ; surfnum<count ; surfnum++, in++, out++)
	{
		out->firstedge = LittleLong(in->firstedge);
		out->numedges = LittleShort(in->numedges);
		out->flags = 0;

		planenum = LittleShort(in->planenum);
		side = LittleShort(in->side);
		if (side)
			out->flags |= SURF_PLANEBACK;

		out->plane = loadmodel->planes + planenum;

		out->texinfo = loadmodel->texinfo + LittleShort (in->texinfo);

		CalcSurfaceExtents (out);

	// lighting info

		for (i=0 ; i<MAXLIGHTMAPS ; i++)
			out->styles[i] = in->styles[i];
		i = LittleLong(in->lightofs);
		if (i == -1)
			out->samples = NULL;
		else
// 2001-09-11 Colored lightning by LordHavoc/Sarcazm/Maddes  start
//			out->samples = loadmodel->lightdata + i;
			out->samples = loadmodel->lightdata + (i * 3);	// expand white lighting
// 2001-09-11 Colored lightning by LordHavoc/Sarcazm/Maddes  end

	// set the drawing flags flag

		if (!strncmp(out->texinfo->texture->name,"sky",3))	// sky
		{
			out->flags |= (SURF_DRAWSKY | SURF_DRAWTILED);
#ifndef QUAKE2
			GL_SubdivideSurface (out);	// cut up polygon for warps
#endif
			continue;
		}

		if (!strncmp(out->texinfo->texture->name,"*",1))		// turbulent
		{
			out->flags |= (SURF_DRAWTURB | SURF_DRAWTILED);
			for (i=0 ; i<2 ; i++)
			{
				out->extents[i] = 16384;
				out->texturemins[i] = -8192;
			}
			GL_SubdivideSurface (out);	// cut up polygon for warps
			continue;
		}

	}
}


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

ALIAS MODELS

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

aliashdr_t	*pheader;

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

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

byte		**player_8bit_texels_tbl;
byte		*player_8bit_texels;

int			aliasbboxmins[3], aliasbboxmaxs[3];	// 2001-11-31 Vanishing entity in screen corners fix by LordHavoc/Tomaz

/*
=================
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);
	frame->firstpose = posenum;
	frame->numposes = 1;

	for (i=0 ; i<3 ; i++)
	{
	// these are byte values, so we don't have to worry about
	// endianness
		frame->bboxmin.v[i] = pdaliasframe->bboxmin.v[i];
// 2001-11-31 Vanishing entity in screen corners fix by LordHavoc/Tomaz  start
//		frame->bboxmin.v[i] = pdaliasframe->bboxmax.v[i];
		frame->bboxmax.v[i] = pdaliasframe->bboxmax.v[i];

		aliasbboxmins[i] = min (frame->bboxmin.v[i], aliasbboxmins[i]);
		aliasbboxmaxs[i] = max (frame->bboxmax.v[i], aliasbboxmaxs[i]);
// 2001-11-31 Vanishing entity in screen corners fix by LordHavoc/Tomaz  end
	}

	pinframe = (trivertx_t *)(pdaliasframe + 1);

	poseverts[posenum] = pinframe;
	posenum++;

	pinframe += pheader->numverts;

	return (void *)pinframe;
}


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

	pingroup = (daliasgroup_t *)pin;

	numframes = LittleLong (pingroup->numframes);

	frame->firstpose = posenum;
	frame->numposes = 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];
// 2001-11-31 Vanishing entity in screen corners fix by LordHavoc/Tomaz  start
//		frame->bboxmin.v[i] = pingroup->bboxmax.v[i];
		frame->bboxmax.v[i] = pingroup->bboxmax.v[i];

		aliasbboxmins[i] = min (frame->bboxmin.v[i], aliasbboxmins[i]);
		aliasbboxmaxs[i] = max (frame->bboxmax.v[i], aliasbboxmaxs[i]);
// 2001-11-31 Vanishing entity in screen corners fix by LordHavoc/Tomaz  end
	}

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

	frame->interval = LittleFloat (pin_intervals->interval);

	pin_intervals += numframes;

	ptemp = (void *)pin_intervals;

	for (i=0 ; i<numframes ; i++)
	{
		poseverts[posenum] = (trivertx_t *)((daliasframe_t *)ptemp + 1);
		posenum++;

		ptemp = (trivertx_t *)((daliasframe_t *)ptemp + 1) + pheader->numverts;
	}

	return ptemp;
}

//=========================================================

/*
=================
Mod_FloodFillSkin

Fill background pixels so mipmapping doesn't have haloes - Ed
=================
*/

typedef struct
{
	short		x, y;
} floodfill_t;

extern unsigned d_8to24table[];

// must be a power of 2
#define FLOODFILL_FIFO_SIZE 0x1000
#define FLOODFILL_FIFO_MASK (FLOODFILL_FIFO_SIZE - 1)

#define FLOODFILL_STEP( off, dx, dy ) \
{ \
	if (pos[off] == fillcolor) \
	{ \
		pos[off] = 255; \
		fifo[inpt].x = x + (dx), fifo[inpt].y = y + (dy); \
		inpt = (inpt + 1) & FLOODFILL_FIFO_MASK; \
	} \
	else if (pos[off] != 255) fdc = pos[off]; \
}

void Mod_FloodFillSkin( byte *skin, int skinwidth, int skinheight )
{
	byte				fillcolor = *skin; // assume this is the pixel to fill
	floodfill_t			fifo[FLOODFILL_FIFO_SIZE];
	int					inpt = 0, outpt = 0;
	int					filledcolor = -1;
	int					i;

	if (filledcolor == -1)
	{
		filledcolor = 0;
		// attempt to find opaque black
		for (i = 0; i < 256; ++i)
			if (d_8to24table[i] == (255 << 0)) // alpha 1.0
			{
				filledcolor = i;
				break;
			}
	}

	// can't fill to filled color or to transparent color (used as visited marker)
	if ((fillcolor == filledcolor) || (fillcolor == 255))
	{
		//printf( "not filling skin from %d to %d\n", fillcolor, filledcolor );
		return;
	}

	fifo[inpt].x = 0, fifo[inpt].y = 0;
	inpt = (inpt + 1) & FLOODFILL_FIFO_MASK;

	while (outpt != inpt)
	{
		int			x = fifo[outpt].x, y = fifo[outpt].y;
		int			fdc = filledcolor;
		byte		*pos = &skin[x + skinwidth * y];

		outpt = (outpt + 1) & FLOODFILL_FIFO_MASK;

		if (x > 0)				FLOODFILL_STEP( -1, -1, 0 );
		if (x < skinwidth - 1)	FLOODFILL_STEP( 1, 1, 0 );
		if (y > 0)				FLOODFILL_STEP( -skinwidth, 0, -1 );
		if (y < skinheight - 1)	FLOODFILL_STEP( skinwidth, 0, 1 );
		skin[x + skinwidth * y] = fdc;
	}
}

/*
===============
Mod_LoadAllSkins
===============
*/
void *Mod_LoadAllSkins (int numskins, daliasskintype_t *pskintype)
{
	int		i, j, k;
	char	name[32];
	int		s;
	byte	*copy;
	byte	*skin;
	byte	*texels;
	daliasskingroup_t		*pinskingroup;
	int		groupskins;
	daliasskininterval_t	*pinskinintervals;

	skin = (byte *)(pskintype + 1);

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

	s = pheader->skinwidth * pheader->skinheight;

	for (i=0 ; i<numskins ; i++)
	{
		if (pskintype->type == ALIAS_SKIN_SINGLE) {
			Mod_FloodFillSkin( skin, pheader->skinwidth, pheader->skinheight );

			// save 8 bit texels for the player model to remap
	//		if (!strcmp(loadmodel->name,"progs/player.mdl")) {
				texels = Hunk_AllocName(s, loadname);
				pheader->texels[i] = texels - (byte *)pheader;
				memcpy (texels, (byte *)(pskintype + 1), s);
	//		}
			sprintf (name, "%s_%i", loadmodel->name, i);
			pheader->gl_texturenum[i][0] =
			pheader->gl_texturenum[i][1] =
			pheader->gl_texturenum[i][2] =
			pheader->gl_texturenum[i][3] =
				GL_LoadTexture (name, pheader->skinwidth,
				pheader->skinheight, (byte *)(pskintype + 1), true, false);
			pskintype = (daliasskintype_t *)((byte *)(pskintype+1) + s);
		} else {
			// animating skin group.  yuck.
			pskintype++;
			pinskingroup = (daliasskingroup_t *)pskintype;
			groupskins = LittleLong (pinskingroup->numskins);
			pinskinintervals = (daliasskininterval_t *)(pinskingroup + 1);

			pskintype = (void *)(pinskinintervals + groupskins);

			for (j=0 ; j<groupskins ; j++)
			{
					Mod_FloodFillSkin( skin, pheader->skinwidth, pheader->skinheight );
					if (j == 0) {
						texels = Hunk_AllocName(s, loadname);
						pheader->texels[i] = texels - (byte *)pheader;
						memcpy (texels, (byte *)(pskintype), s);
					}
					sprintf (name, "%s_%i_%i", loadmodel->name, i,j);
					pheader->gl_texturenum[i][j&3] =
						GL_LoadTexture (name, pheader->skinwidth,
						pheader->skinheight, (byte *)(pskintype), true, false);
					pskintype = (daliasskintype_t *)((byte *)(pskintype) + s);
			}
			k = j;
			for (/* */; j < 4; j++)
				pheader->gl_texturenum[i][j&3] =
				pheader->gl_texturenum[i][j - k];
		}
	}

	return (void *)pskintype;
}

//=========================================================================

/*
=================
Mod_LoadAliasModel
=================
*/
void Mod_LoadAliasModel (model_t *mod, void *buffer)
{
	int					i, j;
	mdl_t				*pinmodel;
	stvert_t			*pinstverts;
	dtriangle_t			*pintriangles;
	int					version, numframes, numskins;
	int					size;
	daliasframetype_t	*pframetype;
	daliasskintype_t	*pskintype;
	int					start, end, total;

	start = Hunk_LowMark ();

	pinmodel = (mdl_t *)buffer;

	version = LittleLong (pinmodel->version);
	if (version != ALIAS_VERSION)
		Sys_Error ("%s has wrong version number (%i should be %i)",
				 mod->name, version, ALIAS_VERSION);

//
// allocate space for a working header, plus all the data except the frames,
// skin and group info
//
	size = 	sizeof (aliashdr_t)
			+ (LittleLong (pinmodel->numframes) - 1) *
			sizeof (pheader->frames[0]);
	pheader = Hunk_AllocName (size, loadname);

	mod->flags = LittleLong (pinmodel->flags);

//
// endian-adjust and copy the data, starting with the alias model header
//
	pheader->boundingradius = LittleFloat (pinmodel->boundingradius);
	pheader->numskins = LittleLong (pinmodel->numskins);
	pheader->skinwidth = LittleLong (pinmodel->skinwidth);
	pheader->skinheight = LittleLong (pinmodel->skinheight);

	if (pheader->skinheight > MAX_LBM_HEIGHT)
		Sys_Error ("model %s has a skin taller than %d", mod->name,
				   MAX_LBM_HEIGHT);

	pheader->numverts = LittleLong (pinmodel->numverts);

	if (pheader->numverts <= 0)
		Sys_Error ("model %s has no vertices", mod->name);

	if (pheader->numverts > MAXALIASVERTS)
		Sys_Error ("model %s has too many vertices", mod->name);

	pheader->numtris = LittleLong (pinmodel->numtris);

	if (pheader->numtris <= 0)
		Sys_Error ("model %s has no triangles", mod->name);

	pheader->numframes = LittleLong (pinmodel->numframes);
	numframes = pheader->numframes;
	if (numframes < 1)
		Sys_Error ("Mod_LoadAliasModel: Invalid # of frames: %d\n", numframes);

	pheader->size = LittleFloat (pinmodel->size) * ALIAS_BASE_SIZE_RATIO;
	mod->synctype = LittleLong (pinmodel->synctype);
	mod->numframes = pheader->numframes;

	for (i=0 ; i<3 ; i++)
	{
		pheader->scale[i] = LittleFloat (pinmodel->scale[i]);
		pheader->scale_origin[i] = LittleFloat (pinmodel->scale_origin[i]);
		pheader->eyeposition[i] = LittleFloat (pinmodel->eyeposition[i]);
	}


//
// load the skins
//
	pskintype = (daliasskintype_t *)&pinmodel[1];
	pskintype = Mod_LoadAllSkins (pheader->numskins, pskintype);

//
// load base s and t vertices
//
	pinstverts = (stvert_t *)pskintype;

	for (i=0 ; i<pheader->numverts ; i++)
	{
		stverts[i].onseam = LittleLong (pinstverts[i].onseam);
		stverts[i].s = LittleLong (pinstverts[i].s);
		stverts[i].t = LittleLong (pinstverts[i].t);
	}

//
// load triangle lists
//
	pintriangles = (dtriangle_t *)&pinstverts[pheader->numverts];

	for (i=0 ; i<pheader->numtris ; i++)
	{
		triangles[i].facesfront = LittleLong (pintriangles[i].facesfront);

		for (j=0 ; j<3 ; j++)
		{
			triangles[i].vertindex[j] =
					LittleLong (pintriangles[i].vertindex[j]);
		}
	}

//
// load the frames
//
	posenum = 0;
	pframetype = (daliasframetype_t *)&pintriangles[pheader->numtris];

// 2001-11-31 Vanishing entity in screen corners fix by LordHavoc/Tomaz  start
	aliasbboxmins[0] = aliasbboxmins[1] = aliasbboxmins[2] =  99999;
	aliasbboxmaxs[0] = aliasbboxmaxs[1] = aliasbboxmaxs[2] = -99999;
// 2001-11-31 Vanishing entity in screen corners fix by LordHavoc/Tomaz  end

	for (i=0 ; i<numframes ; i++)
	{
		aliasframetype_t	frametype;

		frametype = LittleLong (pframetype->type);

		if (frametype == ALIAS_SINGLE)
		{
			pframetype = (daliasframetype_t *)
					Mod_LoadAliasFrame (pframetype + 1, &pheader->frames[i]);
		}
		else
		{
			pframetype = (daliasframetype_t *)
					Mod_LoadAliasGroup (pframetype + 1, &pheader->frames[i]);
		}
	}

	pheader->numposes = posenum;

	mod->type = mod_alias;

// 2001-11-31 Vanishing entity in screen corners fix by LordHavoc/Tomaz  start
/*
// FIXME: do this right
	mod->mins[0] = mod->mins[1] = mod->mins[2] = -16;
	mod->maxs[0] = mod->maxs[1] = mod->maxs[2] = 16;
*/

	for (i = 0; i < 3; i++)
	{
		mod->mins[i] = aliasbboxmins[i] * pheader->scale[i] + pheader->scale_origin[i];
		mod->maxs[i] = aliasbboxmaxs[i] * pheader->scale[i] + pheader->scale_origin[i];

		// Keep necessary minimum bounding box by Maddes  start
		if (mod->mins[i] > -16)
		{
			mod->mins[i] = -16;
		}
		if (mod->maxs[i] < 16)
		{
			mod->maxs[i] = 16;
		}
		// Keep necessary minimum bounding box by Maddes  end
	}
// 2001-11-31 Vanishing entity in screen corners fix by LordHavoc/Tomaz  end

	//
	// build the draw lists
	//
	GL_MakeAliasModelDisplayLists (mod, pheader);

//
// move the complete, relocatable alias model to the cache
//
	end = Hunk_LowMark ();
	total = end - start;

	Cache_Alloc (&mod->cache, total, loadname);
	if (!mod->cache.data)
		return;
	memcpy (mod->cache.data, pheader, total);

	Hunk_FreeToLowMark (start);
}

//=============================================================================

/*
=================
Mod_LoadSpriteFrame
=================
*/
void * Mod_LoadSpriteFrame (void * pin, mspriteframe_t **ppframe, int framenum)
{
	dspriteframe_t		*pinframe;
	mspriteframe_t		*pspriteframe;
	int					i, width, height, size, origin[2];
	unsigned short		*ppixout;
	byte				*ppixin;
	char				name[64];

	pinframe = (dspriteframe_t *)pin;

	width = LittleLong (pinframe->width);
	height = LittleLong (pinframe->height);
	size = width * height;

	pspriteframe = Hunk_AllocName (sizeof (mspriteframe_t),loadname);

	Q_memset (pspriteframe, 0, sizeof (mspriteframe_t));

	*ppframe = pspriteframe;

	pspriteframe->width = width;
	pspriteframe->height = height;
	origin[0] = LittleLong (pinframe->origin[0]);
	origin[1] = LittleLong (pinframe->origin[1]);

	pspriteframe->up = origin[1];
	pspriteframe->down = origin[1] - height;
	pspriteframe->left = origin[0];
	pspriteframe->right = width + origin[0];

	sprintf (name, "%s_%i", loadmodel->name, framenum);
	pspriteframe->gl_texturenum = GL_LoadTexture (name, width, height, (byte *)(pinframe + 1), true, true);

	return (void *)((byte *)pinframe + sizeof (dspriteframe_t) + size);
}


/*
=================
Mod_LoadSpriteGroup
=================
*/
void * Mod_LoadSpriteGroup (void * pin, mspriteframe_t **ppframe, int framenum)
{
	dspritegroup_t		*pingroup;
	mspritegroup_t		*pspritegroup;
	int					i, numframes;
	dspriteinterval_t	*pin_intervals;
	float				*poutintervals;
	void				*ptemp;

	pingroup = (dspritegroup_t *)pin;

	numframes = LittleLong (pingroup->numframes);

	pspritegroup = Hunk_AllocName (sizeof (mspritegroup_t) +
				(numframes - 1) * sizeof (pspritegroup->frames[0]), loadname);

	pspritegroup->numframes = numframes;

	*ppframe = (mspriteframe_t *)pspritegroup;

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

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

	pspritegroup->intervals = poutintervals;

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

		poutintervals++;
		pin_intervals++;
	}

	ptemp = (void *)pin_intervals;

	for (i=0 ; i<numframes ; i++)
	{
		ptemp = Mod_LoadSpriteFrame (ptemp, &pspritegroup->frames[i], framenum * 100 + i);
	}

	return ptemp;
}


/*
=================
Mod_LoadSpriteModel
=================
*/
void Mod_LoadSpriteModel (model_t *mod, void *buffer)
{
	int					i;
	int					version;
	dsprite_t			*pin;
	msprite_t			*psprite;
	int					numframes;
	int					size;
	dspriteframetype_t	*pframetype;

	pin = (dsprite_t *)buffer;

	version = LittleLong (pin->version);
	if (version != SPRITE_VERSION)
		Sys_Error ("%s has wrong version number "
				 "(%i should be %i)", mod->name, version, SPRITE_VERSION);

	numframes = LittleLong (pin->numframes);

	size = sizeof (msprite_t) +	(numframes - 1) * sizeof (psprite->frames);

	psprite = Hunk_AllocName (size, loadname);

	mod->cache.data = psprite;

	psprite->type = LittleLong (pin->type);
	psprite->maxwidth = LittleLong (pin->width);
	psprite->maxheight = LittleLong (pin->height);
	psprite->beamlength = LittleFloat (pin->beamlength);
	mod->synctype = LittleLong (pin->synctype);
	psprite->numframes = numframes;

	mod->mins[0] = mod->mins[1] = -psprite->maxwidth/2;
	mod->maxs[0] = mod->maxs[1] = psprite->maxwidth/2;
	mod->mins[2] = -psprite->maxheight/2;
	mod->maxs[2] = psprite->maxheight/2;

//
// load the frames
//
	if (numframes < 1)
		Sys_Error ("Mod_LoadSpriteModel: Invalid # of frames: %d\n", numframes);

	mod->numframes = numframes;

	pframetype = (dspriteframetype_t *)(pin + 1);

	for (i=0 ; i<numframes ; i++)
	{
		spriteframetype_t	frametype;

		frametype = LittleLong (pframetype->type);
		psprite->frames[i].type = frametype;

		if (frametype == SPR_SINGLE)
		{
			pframetype = (dspriteframetype_t *)
					Mod_LoadSpriteFrame (pframetype + 1,
										 &psprite->frames[i].frameptr, i);
		}
		else
		{
			pframetype = (dspriteframetype_t *)
					Mod_LoadSpriteGroup (pframetype + 1,
										 &psprite->frames[i].frameptr, i);
		}
	}

	mod->type = mod_sprite;
}

//=============================================================================

/*
================
Mod_Print
================
*/
void Mod_Print (void)
{
	int		i;
	model_t	*mod;

	Con_Printf ("Cached models:\n");
	for (i=0, mod=mod_known ; i < mod_numknown ; i++, mod++)
	{
		Con_Printf ("%8p : %s\n",mod->cache.data, mod->name);
	}
}