1/*
2Copyright (C) 1996-1997 Id Software, Inc.
3
4This program is free software; you can redistribute it and/or
5modify it under the terms of the GNU General Public License
6as published by the Free Software Foundation; either version 2
7of the License, or (at your option) any later version.
8
9This program is distributed in the hope that it will be useful,
10but WITHOUT ANY WARRANTY; without even the implied warranty of
11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12
13See the GNU General Public License for more details.
14
15You should have received a copy of the GNU General Public License
16along with this program; if not, write to the Free Software
17Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
18
19*/
20#ifndef GLQUAKE
21// r_shared.h: general refresh-related stuff shared between the refresh and the
22// driver
23
24// FIXME: clean up and move into d_iface.h
25
26#ifndef _R_SHARED_H_
27#define _R_SHARED_H_
28
29#define	MAXVERTS	16					// max points in a surface polygon
30#define MAXWORKINGVERTS	(MAXVERTS+4)	// max points in an intermediate
31										//  polygon (while processing)
32// !!! if this is changed, it must be changed in d_ifacea.h too !!!
33#define	MAXHEIGHT		1024
34#define	MAXWIDTH		1280
35#define MAXDIMENSION	((MAXHEIGHT > MAXWIDTH) ? MAXHEIGHT : MAXWIDTH)
36
37#define SIN_BUFFER_SIZE	(MAXDIMENSION+CYCLE)
38
39#define INFINITE_DISTANCE	0x10000		// distance that's always guaranteed to
40										//  be farther away than anything in
41										//  the scene
42
43//===================================================================
44
45extern void	R_DrawLine (polyvert_t *polyvert0, polyvert_t *polyvert1);
46
47extern int		cachewidth;
48extern pixel_t	*cacheblock;
49extern int		screenwidth;
50
51extern	float	pixelAspect;
52
53extern int		r_drawnpolycount;
54
55extern cvar_t	r_clearcolor;
56
57extern int	sintable[SIN_BUFFER_SIZE];
58extern int	intsintable[SIN_BUFFER_SIZE];
59
60extern	vec3_t	vup, base_vup;
61extern	vec3_t	vpn, base_vpn;
62extern	vec3_t	vright, base_vright;
63extern	entity_t		*currententity;
64
65#define NUMSTACKEDGES		2400
66#define	MINEDGES			NUMSTACKEDGES
67#define NUMSTACKSURFACES	800
68#define MINSURFACES			NUMSTACKSURFACES
69#define	MAXSPANS			3000
70
71// !!! if this is changed, it must be changed in asm_draw.h too !!!
72typedef struct espan_s
73{
74	int				u, v, count;
75	struct espan_s	*pnext;
76} espan_t;
77
78// FIXME: compress, make a union if that will help
79// insubmodel is only 1, flags is fewer than 32, spanstate could be a byte
80typedef struct surf_s
81{
82	struct surf_s	*next;			// active surface stack in r_edge.c
83	struct surf_s	*prev;			// used in r_edge.c for active surf stack
84	struct espan_s	*spans;			// pointer to linked list of spans to draw
85	int			key;				// sorting key (BSP order)
86	int			last_u;				// set during tracing
87	int			spanstate;			// 0 = not in span
88									// 1 = in span
89									// -1 = in inverted span (end before
90									//  start)
91	int			flags;				// currentface flags
92	void		*data;				// associated data like msurface_t
93	entity_t	*entity;
94	float		nearzi;				// nearest 1/z on surface, for mipmapping
95	qboolean	insubmodel;
96	float		d_ziorigin, d_zistepu, d_zistepv;
97
98	int			pad[2];				// to 64 bytes
99} surf_t;
100
101extern	surf_t	*surfaces, *surface_p, *surf_max;
102
103// surfaces are generated in back to front order by the bsp, so if a surf
104// pointer is greater than another one, it should be drawn in front
105// surfaces[1] is the background, and is used as the active surface stack.
106// surfaces[0] is a dummy, because index 0 is used to indicate no surface
107//  attached to an edge_t
108
109//===================================================================
110
111extern vec3_t	sxformaxis[4];	// s axis transformed into viewspace
112extern vec3_t	txformaxis[4];	// t axis transformed into viewspac
113
114extern vec3_t	modelorg, base_modelorg;
115
116extern	float	xcenter, ycenter;
117extern	float	xscale, yscale;
118extern	float	xscaleinv, yscaleinv;
119extern	float	xscaleshrink, yscaleshrink;
120
121extern	int d_lightstylevalue[256]; // 8.8 frac of base light value
122
123extern void TransformVector (vec3_t in, vec3_t out);
124extern void SetUpForLineScan(fixed8_t startvertu, fixed8_t startvertv,
125	fixed8_t endvertu, fixed8_t endvertv);
126
127extern int	r_skymade;
128extern void R_MakeSky (void);
129
130extern int	ubasestep, errorterm, erroradjustup, erroradjustdown;
131
132// flags in finalvert_t.flags
133#define ALIAS_LEFT_CLIP				0x0001
134#define ALIAS_TOP_CLIP				0x0002
135#define ALIAS_RIGHT_CLIP			0x0004
136#define ALIAS_BOTTOM_CLIP			0x0008
137#define ALIAS_Z_CLIP				0x0010
138// !!! if this is changed, it must be changed in d_ifacea.h too !!!
139#define ALIAS_ONSEAM				0x0020	// also defined in modelgen.h;
140											//  must be kept in sync
141#define ALIAS_XY_CLIP_MASK			0x000F
142
143// !!! if this is changed, it must be changed in asm_draw.h too !!!
144typedef struct edge_s
145{
146	fixed16_t		u;
147	fixed16_t		u_step;
148	struct edge_s	*prev, *next;
149	unsigned short	surfs[2];
150	struct edge_s	*nextremove;
151	float			nearzi;
152	medge_t			*owner;
153} edge_t;
154
155#endif	// _R_SHARED_H_
156
157#endif	// GLQUAKE
158