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_init.c: rasterization driver initialization
21
22#include "quakedef.h"
23#include "d_local.h"
24
25#define NUM_MIPS	4
26
27cvar_t	d_subdiv16 = {"d_subdiv16", "1"};
28cvar_t	d_mipcap = {"d_mipcap", "0"};
29cvar_t	d_mipscale = {"d_mipscale", "1"};
30
31surfcache_t		*d_initial_rover;
32qboolean		d_roverwrapped;
33int				d_minmip;
34float			d_scalemip[NUM_MIPS-1];
35
36static float	basemip[NUM_MIPS-1] = {1.0, 0.5*0.8, 0.25*0.8};
37
38extern int			d_aflatcolor;
39
40void (*d_drawspans) (espan_t *pspan);
41
42
43/*
44===============
45D_Init
46===============
47*/
48void D_Init (void)
49{
50
51	r_skydirect = 1;
52
53	Cvar_RegisterVariable (&d_subdiv16);
54	Cvar_RegisterVariable (&d_mipcap);
55	Cvar_RegisterVariable (&d_mipscale);
56
57	r_drawpolys = false;
58	r_worldpolysbacktofront = false;
59	r_recursiveaffinetriangles = true;
60	r_pixbytes = 1;
61	r_aliasuvscale = 1.0;
62}
63
64
65/*
66===============
67D_CopyRects
68===============
69*/
70void D_CopyRects (vrect_t *prects, int transparent)
71{
72
73// this function is only required if the CPU doesn't have direct access to the
74// back buffer, and there's some driver interface function that the driver
75// doesn't support and requires Quake to do in software (such as drawing the
76// console); Quake will then draw into wherever the driver points vid.buffer
77// and will call this function before swapping buffers
78
79	UNUSED(prects);
80	UNUSED(transparent);
81}
82
83
84/*
85===============
86D_EnableBackBufferAccess
87===============
88*/
89void D_EnableBackBufferAccess (void)
90{
91
92	VID_LockBuffer ();
93}
94
95
96/*
97===============
98D_TurnZOn
99===============
100*/
101void D_TurnZOn (void)
102{
103// not needed for software version
104}
105
106
107/*
108===============
109D_DisableBackBufferAccess
110===============
111*/
112void D_DisableBackBufferAccess (void)
113{
114	VID_UnlockBuffer ();
115}
116
117
118/*
119===============
120D_SetupFrame
121===============
122*/
123void D_SetupFrame (void)
124{
125	int		i;
126
127	if (r_dowarp)
128		d_viewbuffer = r_warpbuffer;
129	else
130		d_viewbuffer = (void *)(byte *)vid.buffer;
131
132	if (r_dowarp)
133		screenwidth = WARP_WIDTH;
134	else
135		screenwidth = vid.rowbytes;
136
137	d_roverwrapped = false;
138	d_initial_rover = sc_rover;
139
140	d_minmip = d_mipcap.value;
141	if (d_minmip > 3)
142		d_minmip = 3;
143	else if (d_minmip < 0)
144		d_minmip = 0;
145
146	for (i=0 ; i<(NUM_MIPS-1) ; i++)
147		d_scalemip[i] = basemip[i] * d_mipscale.value;
148
149#if	id386
150				if (d_subdiv16.value)
151					d_drawspans = D_DrawSpans16;
152				else
153					d_drawspans = D_DrawSpans8;
154#else
155				d_drawspans = D_DrawSpans8;
156#endif
157
158	d_aflatcolor = 0;
159}
160
161
162/*
163===============
164D_UpdateRects
165===============
166*/
167void D_UpdateRects (vrect_t *prect)
168{
169
170// the software driver draws these directly to the vid buffer
171
172	UNUSED(prect);
173}
174
175