1 /*
2 Copyright (C) 1996-1997 Id Software, Inc.
3
4 This program is free software; you can redistribute it and/or
5 modify it under the terms of the GNU General Public License
6 as published by the Free Software Foundation; either version 2
7 of the License, or (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12
13 See the GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, 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
27 cvar_t d_subdiv16 = {"d_subdiv16", "1"};
28 cvar_t d_mipcap = {"d_mipcap", "0"};
29 cvar_t d_mipscale = {"d_mipscale", "1"};
30
31 surfcache_t *d_initial_rover;
32 qboolean d_roverwrapped;
33 int d_minmip;
34 float d_scalemip[NUM_MIPS-1];
35
36 static float basemip[NUM_MIPS-1] = {1.0, 0.5*0.8, 0.25*0.8};
37
38 extern int d_aflatcolor;
39
40 void (*d_drawspans) (espan_t *pspan);
41
42
43 /*
44 ===============
45 D_Init
46 ===============
47 */
D_Init(void)48 void 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 ===============
67 D_CopyRects
68 ===============
69 */
D_CopyRects(vrect_t * prects,int transparent)70 void 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 ===============
86 D_EnableBackBufferAccess
87 ===============
88 */
D_EnableBackBufferAccess(void)89 void D_EnableBackBufferAccess (void)
90 {
91
92 VID_LockBuffer ();
93 }
94
95
96 /*
97 ===============
98 D_TurnZOn
99 ===============
100 */
D_TurnZOn(void)101 void D_TurnZOn (void)
102 {
103 // not needed for software version
104 }
105
106
107 /*
108 ===============
109 D_DisableBackBufferAccess
110 ===============
111 */
D_DisableBackBufferAccess(void)112 void D_DisableBackBufferAccess (void)
113 {
114 VID_UnlockBuffer ();
115 }
116
117
118 /*
119 ===============
120 D_SetupFrame
121 ===============
122 */
D_SetupFrame(void)123 void 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 ===============
164 D_UpdateRects
165 ===============
166 */
D_UpdateRects(vrect_t * prect)167 void 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