Scrap PC98 support.
[dragonfly.git] / sys / dev / misc / syscons / dragon / dragon_saver.c
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1/*-
2 * Copyright (c) 2000 Chiharu Shibata
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer
10 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD: src/sys/modules/syscons/dragon/dragon_saver.c,v 1.1.2.1 2003/05/11 01:17:02 murray Exp $
7aa7bdf5 29 * $DragonFly: src/sys/dev/misc/syscons/dragon/dragon_saver.c,v 1.4 2005/02/13 03:02:25 swildner Exp $
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30 */
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/kernel.h>
35#include <sys/module.h>
36#include <sys/syslog.h>
37#include <sys/consio.h>
38#include <sys/fbio.h>
39
40#include <sys/random.h>
41
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42#include <dev/video/fb/fbreg.h>
43#include <dev/video/fb/splashreg.h>
44#include "../syscons.h"
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45
46#define SAVER_NAME "dragon_saver"
47
48static u_char *vid;
49static int blanked;
50
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51#define VIDEO_MODE M_VGA_CG320
52#define VIDEO_MODE_NAME "M_VGA_CG320"
53#define SCRW 320
54#define SCRH 200
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55#define ORDER 13
56#define CURVE 3
57#define OUT 100
58
59static int cur_x, cur_y;
60static int curve;
61static u_char dragon_pal[3*256]; /* zero-filled by the compiler */
62
63static __inline int
64gpset(int x, int y, int val)
65{
66 if (x < 0 || y < 0 || SCRW <= x || SCRH <= y) {
67 return 0;
68 }
984263bc 69 vid[x + y * SCRW] = val;
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70 return 1;
71}
72
73static int
74gdraw(int dx, int dy, int val)
75{
76 int i;
77 int set = 0;
78
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79 if (dx != 0) {
80 i = cur_x;
81 cur_x += dx;
82 if (dx < 0) {
83 i += dx;
84 dx = -dx;
85 }
86 /* horizontal line */
87 for (; dx >= 0; --dx, ++i) {
88 set |= gpset(i, cur_y, val);
89 }
90 }
91 else { /* dy != 0 */
92 i = cur_y;
93 cur_y += dy;
94 if (dy < 0) {
95 i += dy;
96 dy = -dy;
97 }
98 /* vertical line */
99 for (; dy >= 0; --dy, ++i) {
100 set |= gpset(cur_x, i, val);
101 }
102 }
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103 return set;
104}
105
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106static void
107dragon_update(video_adapter_t *adp)
108{
109 static int i, p, q;
110 static int order, mul, out;
111 static int org_x, org_y;
112 static int dx, dy;
113 static unsigned char fold[1 << (ORDER - 3)];
114#define GET_FOLD(x) (fold[(x) >> 3] & (1 << ((x) & 7)))
115#define SET_FOLD(x) (fold[(x) >> 3] |= (1 << ((x) & 7)))
116#define CLR_FOLD(x) (fold[(x) >> 3] &= ~(1 << ((x) & 7)))
117 int tmp;
118
119 if (curve > CURVE) {
7aa7bdf5 120 bzero(vid, SCRW*SCRH);
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121
122 /* set palette of each curves */
123 for (tmp = 0; tmp < 3*CURVE; ++tmp) {
124 dragon_pal[3+tmp] = (u_char)random();
125 }
126 load_palette(adp, dragon_pal);
127
128 mul = ((random() & 7) + 1) * (SCRW / 320);
129 org_x = random() % SCRW; org_y = random() % SCRH;
130
131 curve = 0;
132 order = ORDER;
133 }
134
135 if (order >= ORDER) {
136 ++curve;
137
138 cur_x = org_x; cur_y = org_y;
139
140 switch (curve) {
141 case 1:
142 dx = 0; dy = mul;
143 break;
144 case 2:
145 dx = mul; dy = 0;
146 break;
147 case 3:
148 dx = 0; dy = -mul;
149 break;
150 }
151 (void)gdraw(dx, dy, curve); out = 0;
152
153 order = 0;
154 q = p = 0; i = q + 1;
155 }
156
157 if (i > q) {
158 SET_FOLD(p); q = p * 2;
159
160 ++order;
161 i = p; p = q + 1;
162 }
163
164 if (GET_FOLD(q-i) != 0) {
165 CLR_FOLD(i);
166 tmp = dx; dx = dy; dy = -tmp; /* turn right */
167 }
168 else {
169 SET_FOLD(i);
170 tmp = dx; dx = -dy; dy = tmp; /* turn left */
171 }
172 if (gdraw(dx, dy, curve)) {
173 out = 0;
174 }
175 else {
176 if (++out > OUT) {
177 order = ORDER; /* force to terminate this curve */
178 }
179 }
180 ++i;
181}
182
183static int
184dragon_saver(video_adapter_t *adp, int blank)
185{
186 int pl;
187
188 if (blank) {
189 /* switch to graphics mode */
190 if (blanked <= 0) {
191 pl = splhigh();
192 set_video_mode(adp, VIDEO_MODE);
193 vid = (u_char *)adp->va_window;
194 curve = CURVE + 1;
195 ++blanked;
196 splx(pl);
197 }
198
199 /* update display */
200 dragon_update(adp);
201 }
202 else {
203 blanked = 0;
204 }
205 return 0;
206}
207
208static int
209dragon_init(video_adapter_t *adp)
210{
211 video_info_t info;
212
213 /* check that the console is capable of running in 320x200x256 */
214 if (get_mode_info(adp, VIDEO_MODE, &info)) {
215 log(LOG_NOTICE,
216 "%s: the console does not support " VIDEO_MODE_NAME "\n",
217 SAVER_NAME);
218 return ENODEV;
219 }
220
221 blanked = 0;
222 return 0;
223}
224
225static int
226dragon_term(video_adapter_t *adp)
227{
228 return 0;
229}
230
231static scrn_saver_t dragon_module = {
232 SAVER_NAME,
233 dragon_init,
234 dragon_term,
235 dragon_saver,
236 NULL,
237};
238
239SAVER_MODULE(dragon_saver, dragon_module);