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// d_local.h:  private rasterization driver defs
21
22#include "r_shared.h"
23
24//
25// TODO: fine-tune this; it's based on providing some overage even if there
26// is a 2k-wide scan, with subdivision every 8, for 256 spans of 12 bytes each
27//
28#define SCANBUFFERPAD		0x1000
29
30#define R_SKY_SMASK	0x007F0000
31#define R_SKY_TMASK	0x007F0000
32
33#define DS_SPAN_LIST_END	-128
34
35#define SURFCACHE_SIZE_AT_320X200	600*1024
36
37typedef struct surfcache_s
38{
39	struct surfcache_s	*next;
40	struct surfcache_s 	**owner;		// NULL is an empty chunk of memory
41	int					lightadj[MAXLIGHTMAPS]; // checked for strobe flush
42	int					dlight;
43	int					size;		// including header
44	unsigned			width;
45	unsigned			height;		// DEBUG only needed for debug
46	float				mipscale;
47	struct texture_s	*texture;	// checked for animating textures
48	byte				data[4];	// width*height elements
49} surfcache_t;
50
51// !!! if this is changed, it must be changed in asm_draw.h too !!!
52typedef struct sspan_s
53{
54	int				u, v, count;
55} sspan_t;
56
57extern cvar_t	d_subdiv16;
58
59extern float	scale_for_mip;
60
61extern qboolean		d_roverwrapped;
62extern surfcache_t	*sc_rover;
63extern surfcache_t	*d_initial_rover;
64
65extern float	d_sdivzstepu, d_tdivzstepu, d_zistepu;
66extern float	d_sdivzstepv, d_tdivzstepv, d_zistepv;
67extern float	d_sdivzorigin, d_tdivzorigin, d_ziorigin;
68
69fixed16_t	sadjust, tadjust;
70fixed16_t	bbextents, bbextentt;
71
72
73void D_DrawSpans8 (espan_t *pspans);
74void D_DrawSpans16 (espan_t *pspans);
75void D_DrawZSpans (espan_t *pspans);
76void Turbulent8 (espan_t *pspan);
77void D_SpriteDrawSpans (sspan_t *pspan);
78
79void D_DrawSkyScans8 (espan_t *pspan);
80void D_DrawSkyScans16 (espan_t *pspan);
81
82void R_ShowSubDiv (void);
83void (*prealspandrawer)(void);
84surfcache_t	*D_CacheSurface (msurface_t *surface, int miplevel);
85
86extern int D_MipLevelForScale (float scale);
87
88#if id386
89extern void D_PolysetAff8Start (void);
90extern void D_PolysetAff8End (void);
91#endif
92
93extern short *d_pzbuffer;
94extern unsigned int d_zrowbytes, d_zwidth;
95
96extern int	*d_pscantable;
97extern int	d_scantable[MAXHEIGHT];
98
99extern int	d_vrectx, d_vrecty, d_vrectright_particle, d_vrectbottom_particle;
100
101extern int	d_y_aspect_shift, d_pix_min, d_pix_max, d_pix_shift;
102
103extern pixel_t	*d_viewbuffer;
104
105extern short	*zspantable[MAXHEIGHT];
106
107extern int		d_minmip;
108extern float	d_scalemip[3];
109
110extern void (*d_drawspans) (espan_t *pspan);
111
112