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/*

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.

*/

#ifndef GLQUAKE

// r_shared.h: general refresh-related stuff shared between the refresh and the

// driver

// FIXME: clean up and move into d_iface.h

#ifndef _R_SHARED_H_

#define _R_SHARED_H_

#define	MAXVERTS	16					// max points in a surface polygon

#define MAXWORKINGVERTS	(MAXVERTS+4)	// max points in an intermediate

										//  polygon (while processing)

// !!! if this is changed, it must be changed in d_ifacea.h too !!!

#define	MAXHEIGHT		1024

#define	MAXWIDTH		1280

#define MAXDIMENSION	((MAXHEIGHT > MAXWIDTH) ? MAXHEIGHT : MAXWIDTH)

#define SIN_BUFFER_SIZE	(MAXDIMENSION+CYCLE)

#define INFINITE_DISTANCE	0x10000		// distance that's always guaranteed to

										//  be farther away than anything in

										//  the scene

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

extern void	R_DrawLine (polyvert_t *polyvert0, polyvert_t *polyvert1);

extern int		cachewidth;

extern pixel_t	*cacheblock;

extern int		screenwidth;

extern	float	pixelAspect;

extern int		r_drawnpolycount;

extern cvar_t	r_clearcolor;

extern int	sintable[SIN_BUFFER_SIZE];

extern int	intsintable[SIN_BUFFER_SIZE];

extern	vec3_t	vup, base_vup;

extern	vec3_t	vpn, base_vpn;

extern	vec3_t	vright, base_vright;

extern	entity_t		*currententity;

#define NUMSTACKEDGES		2400

#define	MINEDGES			NUMSTACKEDGES

#define NUMSTACKSURFACES	800

#define MINSURFACES			NUMSTACKSURFACES

#define	MAXSPANS			3000

// !!! if this is changed, it must be changed in asm_draw.h too !!!

typedef struct espan_s

{

	int				u, v, count;

	struct espan_s	*pnext;

} espan_t;

// FIXME: compress, make a union if that will help

// insubmodel is only 1, flags is fewer than 32, spanstate could be a byte

typedef struct surf_s

{

	struct surf_s	*next;			// active surface stack in r_edge.c

	struct surf_s	*prev;			// used in r_edge.c for active surf stack

	struct espan_s	*spans;			// pointer to linked list of spans to draw

	int			key;				// sorting key (BSP order)

	int			last_u;				// set during tracing

	int			spanstate;			// 0 = not in span

									// 1 = in span

									// -1 = in inverted span (end before

									//  start)

	int			flags;				// currentface flags

	void		*data;				// associated data like msurface_t

	entity_t	*entity;

	float		nearzi;				// nearest 1/z on surface, for mipmapping

	qboolean	insubmodel;

	float		d_ziorigin, d_zistepu, d_zistepv;

	int			pad[2];				// to 64 bytes

} surf_t;

extern	surf_t	*surfaces, *surface_p, *surf_max;

// surfaces are generated in back to front order by the bsp, so if a surf

// pointer is greater than another one, it should be drawn in front

// surfaces[1] is the background, and is used as the active surface stack.

// surfaces[0] is a dummy, because index 0 is used to indicate no surface

//  attached to an edge_t

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

extern vec3_t	sxformaxis[4];	// s axis transformed into viewspace

extern vec3_t	txformaxis[4];	// t axis transformed into viewspac

extern vec3_t	modelorg, base_modelorg;

extern	float	xcenter, ycenter;

extern	float	xscale, yscale;

extern	float	xscaleinv, yscaleinv;

extern	float	xscaleshrink, yscaleshrink;

extern	int d_lightstylevalue[256]; // 8.8 frac of base light value

extern void TransformVector (vec3_t in, vec3_t out);

extern void SetUpForLineScan(fixed8_t startvertu, fixed8_t startvertv,

	fixed8_t endvertu, fixed8_t endvertv);

extern int	r_skymade;

extern void R_MakeSky (void);

extern int	ubasestep, errorterm, erroradjustup, erroradjustdown;

// flags in finalvert_t.flags

#define ALIAS_LEFT_CLIP				0x0001

#define ALIAS_TOP_CLIP				0x0002

#define ALIAS_RIGHT_CLIP			0x0004

#define ALIAS_BOTTOM_CLIP			0x0008

#define ALIAS_Z_CLIP				0x0010

// !!! if this is changed, it must be changed in d_ifacea.h too !!!

#define ALIAS_ONSEAM				0x0020	// also defined in modelgen.h;

											//  must be kept in sync

#define ALIAS_XY_CLIP_MASK			0x000F

// !!! if this is changed, it must be changed in asm_draw.h too !!!

typedef struct edge_s

{

	fixed16_t		u;

	fixed16_t		u_step;

	struct edge_s	*prev, *next;

	unsigned short	surfs[2];

	struct edge_s	*nextremove;

	float			nearzi;

	medge_t			*owner;

} edge_t;

#endif	// _R_SHARED_H_

#endif	// GLQUAKE