/*
	gl_model.c

	(description)

	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.c -- model loading and caching

// models are the only shared resource between a client and server running
// on the same machine.
#include <math.h>
#include <string.h>
#include <stdio.h>

#include "bothdefs.h"   // needed by: common.h, net.h, client.h

#include "common.h"
#include "bspfile.h"    // needed by: glquake.h
#include "vid.h"
#include "sys.h"
#include "zone.h"       // needed by: client.h, gl_model.h
#include "mathlib.h"    // needed by: protocol.h, render.h, client.h,
                        //  modelgen.h, glmodel.h
#include "wad.h"
#include "draw.h"
#include "cvar.h"
#include "crc.h"
#include "net.h"        // needed by: client.h
#include "protocol.h"   // needed by: client.h
#include "cmd.h"
#include "sbar.h"
#include "render.h"     // needed by: client.h, gl_model.h, glquake.h
#include "client.h"     // need cls in this file
#include "gl_model.h"   // needed by: glquake.h
#include "console.h"
#include "glquake.h"

void SV_Error (char *error, ...);

extern char	loadname[];	// for hunk tags
extern model_t	*loadmodel;
extern model_t	mod_known[];
extern int	mod_numknown;

void Mod_LoadSpriteModel (model_t *mod, void *buffer);
void Mod_LoadBrushModel (model_t *mod, void *buffer);
void Mod_LoadAliasModel (model_t *mod, void *buffer);
model_t *Mod_LoadModel (model_t *mod, qboolean crash);
model_t *Mod_FindName (char *name);

/*
===============
Mod_Init

Caches the data if needed
===============
*/
void *Mod_Extradata (model_t *mod)
{
	void	*r;
	
	r = Cache_Check (&mod->cache);
	if (r)
		return r;

	Mod_LoadModel (mod, true);
	
	if (!mod->cache.data)
		SV_Error ("Mod_Extradata: caching failed");
	return mod->cache.data;
}

/*
==================
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);
	}
}

void
Mod_LoadMMNearest(miptex_t *mt, texture_t	*tx)
{
	texture_mode = GL_LINEAR_MIPMAP_NEAREST; //_LINEAR;
	tx->gl_texturenum = GL_LoadTexture (mt->name, tx->width, tx->height, (byte *)(tx+1), true, false);
	texture_mode = GL_LINEAR;
}

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

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[320*200];

/*
=================
Mod_LoadAliasFrame
=================
*/
void * Mod_LoadAliasFrame (void * pin, maliasframedesc_t *frame)
{
	trivertx_t		*pinframe;
	int				i;
	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];
		frame->bboxmin.v[i] = pdaliasframe->bboxmax.v[i];
	}

	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];
		frame->bboxmin.v[i] = pingroup->bboxmax.v[i];
	}

	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	*skin;
	daliasskingroup_t		*pinskingroup;
	int		groupskins;
	daliasskininterval_t	*pinskinintervals;
	
	skin = (byte *)(pskintype + 1);

	if (numskins < 1 || numskins > MAX_SKINS)
		SV_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
			// save 8 bit texels for the player model to remap
			if (!strcmp(loadmodel->name,"progs/player.mdl"))
			{
				if (s > sizeof(player_8bit_texels))
					SV_Error ("Player skin too large");
				memcpy (player_8bit_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 );
					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;
	int					size;
	daliasframetype_t	*pframetype;
	daliasskintype_t	*pskintype;
	int					start, end, total;

	if (!strcmp(loadmodel->name, "progs/player.mdl") ||
		!strcmp(loadmodel->name, "progs/eyes.mdl")) {
		unsigned short crc;
		byte *p;
		int len;
		char st[40];

		CRC_Init(&crc);
		for (len = com_filesize, p = buffer; len; len--, p++)
			CRC_ProcessByte(&crc, *p);
	
		sprintf(st, "%d", (int) crc);
		Info_SetValueForKey (cls.userinfo, 
			!strcmp(loadmodel->name, "progs/player.mdl") ? pmodel_name : emodel_name,
			st, MAX_INFO_STRING);

		if (cls.state >= ca_connected) {
			MSG_WriteByte (&cls.netchan.message, clc_stringcmd);
			sprintf(st, "setinfo %s %d", 
				!strcmp(loadmodel->name, "progs/player.mdl") ? pmodel_name : emodel_name,
				(int)crc);
			SZ_Print (&cls.netchan.message, st);
		}
	}
	
	start = Hunk_LowMark ();

	pinmodel = (mdl_t *)buffer;

	version = LittleLong (pinmodel->version);
	if (version != ALIAS_VERSION)
		SV_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)
		SV_Error ("model %s has a skin taller than %d", mod->name,
				   MAX_LBM_HEIGHT);

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

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

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

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

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

	pheader->numframes = LittleLong (pinmodel->numframes);
	numframes = pheader->numframes;
	if (numframes < 1)
		SV_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];

	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;

// FIXME: do this right
	mod->mins[0] = mod->mins[1] = mod->mins[2] = -16;
	mod->maxs[0] = mod->maxs[1] = mod->maxs[2] = 16;

	//
	// 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					width, height, size, origin[2];
	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)
			SV_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)
		SV_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)
		SV_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);
	}
}