1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1991-1997 Søren Schmidt
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer
12 * in this position and unchanged.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33
34 #include <signal.h>
35 #include <sys/fbio.h>
36 #include "vgl.h"
37
38 static byte VGLSavePaletteRed[256];
39 static byte VGLSavePaletteGreen[256];
40 static byte VGLSavePaletteBlue[256];
41
42 #define ABS(a) (((a)<0) ? -(a) : (a))
43 #define SGN(a) (((a)<0) ? -1 : 1)
44 #define min(x, y) (((x) < (y)) ? (x) : (y))
45 #define max(x, y) (((x) > (y)) ? (x) : (y))
46
47 static void
color2mem(u_long color,byte * b,int len)48 color2mem(u_long color, byte *b, int len)
49 {
50 switch (len) {
51 case 4:
52 b[3] = (color >> 24) & 0xff;
53 /* fallthrough */
54 case 3:
55 b[2] = (color >> 16) & 0xff;
56 /* fallthrough */
57 case 2:
58 b[1] = (color >> 8) & 0xff;
59 /* fallthrough */
60 case 1:
61 default:
62 b[0] = color & 0xff;
63 break;
64 }
65
66 return;
67 }
68
69 static u_long
mem2color(byte * b,int len)70 mem2color(byte *b, int len)
71 {
72 u_long color = 0;
73
74 switch (len) {
75 case 4:
76 color |= (b[3] & 0xff) << 24;
77 /* fallthrough */
78 case 3:
79 color |= (b[2] & 0xff) << 16;
80 /* fallthrough */
81 case 2:
82 color |= (b[1] & 0xff) << 8;
83 /* fallthrough */
84 case 1:
85 default:
86 color |= (b[0] & 0xff);
87 break;
88 }
89
90 return color;
91 }
92
93 void
VGLSetXY(VGLBitmap * object,int x,int y,u_long color)94 VGLSetXY(VGLBitmap *object, int x, int y, u_long color)
95 {
96 int offset;
97 byte b[4];
98
99 VGLCheckSwitch();
100 if (x>=0 && x<object->VXsize && y>=0 && y<object->VYsize) {
101 if (!VGLMouseFreeze(x, y, 1, 1, color)) {
102 switch (object->Type) {
103 case MEMBUF:
104 case VIDBUF8:
105 object->Bitmap[y*object->VXsize+x]=((byte)color);
106 break;
107 case VIDBUF8S:
108 object->Bitmap[VGLSetSegment(y*object->VXsize+x)]=((byte)color);
109 break;
110 case VIDBUF16:
111 case VIDBUF24:
112 case VIDBUF32:
113 color2mem(color, b, object->PixelBytes);
114 bcopy(b, &object->Bitmap[(y*object->VXsize+x) * object->PixelBytes],
115 object->PixelBytes);
116 break;
117 case VIDBUF16S:
118 case VIDBUF24S:
119 case VIDBUF32S:
120 color2mem(color, b, object->PixelBytes);
121 offset = VGLSetSegment((y*object->VXsize+x) * object->PixelBytes);
122 bcopy(b, &object->Bitmap[offset], object->PixelBytes);
123 break;
124 case VIDBUF8X:
125 outb(0x3c4, 0x02);
126 outb(0x3c5, 0x01 << (x&0x3));
127 object->Bitmap[(unsigned)(VGLAdpInfo.va_line_width*y)+(x/4)] = ((byte)color);
128 break;
129 case VIDBUF4S:
130 offset = VGLSetSegment(y*VGLAdpInfo.va_line_width + x/8);
131 goto set_planar;
132 case VIDBUF4:
133 offset = y*VGLAdpInfo.va_line_width + x/8;
134 set_planar:
135 outb(0x3c4, 0x02); outb(0x3c5, 0x0f);
136 outb(0x3ce, 0x00); outb(0x3cf, (byte)color & 0x0f); /* set/reset */
137 outb(0x3ce, 0x01); outb(0x3cf, 0x0f); /* set/reset enable */
138 outb(0x3ce, 0x08); outb(0x3cf, 0x80 >> (x%8)); /* bit mask */
139 object->Bitmap[offset] |= (byte)color;
140 }
141 }
142 VGLMouseUnFreeze();
143 }
144 }
145
146 u_long
VGLGetXY(VGLBitmap * object,int x,int y)147 VGLGetXY(VGLBitmap *object, int x, int y)
148 {
149 int offset;
150 byte b[4];
151 #if 0
152 int i;
153 u_long color;
154 byte mask;
155 #endif
156
157 VGLCheckSwitch();
158 if (x<0 || x>=object->VXsize || y<0 || y>=object->VYsize)
159 return 0;
160 switch (object->Type) {
161 case MEMBUF:
162 case VIDBUF8:
163 return object->Bitmap[((y*object->VXsize)+x)];
164 case VIDBUF8S:
165 return object->Bitmap[VGLSetSegment(y*object->VXsize+x)];
166 case VIDBUF16:
167 case VIDBUF24:
168 case VIDBUF32:
169 bcopy(&object->Bitmap[(y*object->VXsize+x) * object->PixelBytes],
170 b, object->PixelBytes);
171 return (mem2color(b, object->PixelBytes));
172 case VIDBUF16S:
173 case VIDBUF24S:
174 case VIDBUF32S:
175 offset = VGLSetSegment((y*object->VXsize+x) * object->PixelBytes);
176 bcopy(&object->Bitmap[offset], b, object->PixelBytes);
177
178 return (mem2color(b, object->PixelBytes));
179 case VIDBUF8X:
180 outb(0x3ce, 0x04); outb(0x3cf, x & 0x3);
181 return object->Bitmap[(unsigned)(VGLAdpInfo.va_line_width*y)+(x/4)];
182 case VIDBUF4S:
183 offset = VGLSetSegment(y*VGLAdpInfo.va_line_width + x/8);
184 goto get_planar;
185 case VIDBUF4:
186 offset = y*VGLAdpInfo.va_line_width + x/8;
187 get_planar:
188 #if 1
189 return (object->Bitmap[offset]&(0x80>>(x%8))) ? 1 : 0; /* XXX */
190 #else
191 color = 0;
192 mask = 0x80 >> (x%8);
193 for (i = 0; i < VGLModeInfo.vi_planes; i++) {
194 outb(0x3ce, 0x04); outb(0x3cf, i);
195 color |= (object->Bitmap[offset] & mask) ? (1 << i) : 0;
196 }
197 return color;
198 #endif
199 }
200 return 0; /* XXX black? */
201 }
202
203 /*
204 * Symmetric Double Step Line Algorithm by Brian Wyvill from
205 * "Graphics Gems", Academic Press, 1990.
206 */
207
208 #define SL_SWAP(a,b) {a^=b; b^=a; a^=b;}
209 #define SL_ABSOLUTE(i,j,k) ( (i-j)*(k = ( (i-j)<0 ? -1 : 1)))
210
211 void
plot(VGLBitmap * object,int x,int y,int flag,byte color)212 plot(VGLBitmap * object, int x, int y, int flag, byte color)
213 {
214 /* non-zero flag indicates the pixels need swapping back. */
215 if (flag)
216 VGLSetXY(object, y, x, color);
217 else
218 VGLSetXY(object, x, y, color);
219 }
220
221
222 void
VGLLine(VGLBitmap * object,int x1,int y1,int x2,int y2,u_long color)223 VGLLine(VGLBitmap *object, int x1, int y1, int x2, int y2, u_long color)
224 {
225 int dx, dy, incr1, incr2, D, x, y, xend, c, pixels_left;
226 int sign_x, sign_y, step, reverse, i;
227
228 dx = SL_ABSOLUTE(x2, x1, sign_x);
229 dy = SL_ABSOLUTE(y2, y1, sign_y);
230 /* decide increment sign by the slope sign */
231 if (sign_x == sign_y)
232 step = 1;
233 else
234 step = -1;
235
236 if (dy > dx) { /* chooses axis of greatest movement (make dx) */
237 SL_SWAP(x1, y1);
238 SL_SWAP(x2, y2);
239 SL_SWAP(dx, dy);
240 reverse = 1;
241 } else
242 reverse = 0;
243 /* note error check for dx==0 should be included here */
244 if (x1 > x2) { /* start from the smaller coordinate */
245 x = x2;
246 y = y2;
247 /* x1 = x1;
248 y1 = y1; */
249 } else {
250 x = x1;
251 y = y1;
252 x1 = x2;
253 y1 = y2;
254 }
255
256
257 /* Note dx=n implies 0 - n or (dx+1) pixels to be set */
258 /* Go round loop dx/4 times then plot last 0,1,2 or 3 pixels */
259 /* In fact (dx-1)/4 as 2 pixels are already plotted */
260 xend = (dx - 1) / 4;
261 pixels_left = (dx - 1) % 4; /* number of pixels left over at the
262 * end */
263 plot(object, x, y, reverse, color);
264 if (pixels_left < 0)
265 return; /* plot only one pixel for zero length
266 * vectors */
267 plot(object, x1, y1, reverse, color); /* plot first two points */
268 incr2 = 4 * dy - 2 * dx;
269 if (incr2 < 0) { /* slope less than 1/2 */
270 c = 2 * dy;
271 incr1 = 2 * c;
272 D = incr1 - dx;
273
274 for (i = 0; i < xend; i++) { /* plotting loop */
275 ++x;
276 --x1;
277 if (D < 0) {
278 /* pattern 1 forwards */
279 plot(object, x, y, reverse, color);
280 plot(object, ++x, y, reverse, color);
281 /* pattern 1 backwards */
282 plot(object, x1, y1, reverse, color);
283 plot(object, --x1, y1, reverse, color);
284 D += incr1;
285 } else {
286 if (D < c) {
287 /* pattern 2 forwards */
288 plot(object, x, y, reverse, color);
289 plot(object, ++x, y += step, reverse,
290 color);
291 /* pattern 2 backwards */
292 plot(object, x1, y1, reverse, color);
293 plot(object, --x1, y1 -= step, reverse,
294 color);
295 } else {
296 /* pattern 3 forwards */
297 plot(object, x, y += step, reverse, color);
298 plot(object, ++x, y, reverse, color);
299 /* pattern 3 backwards */
300 plot(object, x1, y1 -= step, reverse,
301 color);
302 plot(object, --x1, y1, reverse, color);
303 }
304 D += incr2;
305 }
306 } /* end for */
307
308 /* plot last pattern */
309 if (pixels_left) {
310 if (D < 0) {
311 plot(object, ++x, y, reverse, color); /* pattern 1 */
312 if (pixels_left > 1)
313 plot(object, ++x, y, reverse, color);
314 if (pixels_left > 2)
315 plot(object, --x1, y1, reverse, color);
316 } else {
317 if (D < c) {
318 plot(object, ++x, y, reverse, color); /* pattern 2 */
319 if (pixels_left > 1)
320 plot(object, ++x, y += step, reverse, color);
321 if (pixels_left > 2)
322 plot(object, --x1, y1, reverse, color);
323 } else {
324 /* pattern 3 */
325 plot(object, ++x, y += step, reverse, color);
326 if (pixels_left > 1)
327 plot(object, ++x, y, reverse, color);
328 if (pixels_left > 2)
329 plot(object, --x1, y1 -= step, reverse, color);
330 }
331 }
332 } /* end if pixels_left */
333 }
334 /* end slope < 1/2 */
335 else { /* slope greater than 1/2 */
336 c = 2 * (dy - dx);
337 incr1 = 2 * c;
338 D = incr1 + dx;
339 for (i = 0; i < xend; i++) {
340 ++x;
341 --x1;
342 if (D > 0) {
343 /* pattern 4 forwards */
344 plot(object, x, y += step, reverse, color);
345 plot(object, ++x, y += step, reverse, color);
346 /* pattern 4 backwards */
347 plot(object, x1, y1 -= step, reverse, color);
348 plot(object, --x1, y1 -= step, reverse, color);
349 D += incr1;
350 } else {
351 if (D < c) {
352 /* pattern 2 forwards */
353 plot(object, x, y, reverse, color);
354 plot(object, ++x, y += step, reverse,
355 color);
356
357 /* pattern 2 backwards */
358 plot(object, x1, y1, reverse, color);
359 plot(object, --x1, y1 -= step, reverse,
360 color);
361 } else {
362 /* pattern 3 forwards */
363 plot(object, x, y += step, reverse, color);
364 plot(object, ++x, y, reverse, color);
365 /* pattern 3 backwards */
366 plot(object, x1, y1 -= step, reverse, color);
367 plot(object, --x1, y1, reverse, color);
368 }
369 D += incr2;
370 }
371 } /* end for */
372 /* plot last pattern */
373 if (pixels_left) {
374 if (D > 0) {
375 plot(object, ++x, y += step, reverse, color); /* pattern 4 */
376 if (pixels_left > 1)
377 plot(object, ++x, y += step, reverse,
378 color);
379 if (pixels_left > 2)
380 plot(object, --x1, y1 -= step, reverse,
381 color);
382 } else {
383 if (D < c) {
384 plot(object, ++x, y, reverse, color); /* pattern 2 */
385 if (pixels_left > 1)
386 plot(object, ++x, y += step, reverse, color);
387 if (pixels_left > 2)
388 plot(object, --x1, y1, reverse, color);
389 } else {
390 /* pattern 3 */
391 plot(object, ++x, y += step, reverse, color);
392 if (pixels_left > 1)
393 plot(object, ++x, y, reverse, color);
394 if (pixels_left > 2) {
395 if (D > c) /* step 3 */
396 plot(object, --x1, y1 -= step, reverse, color);
397 else /* step 2 */
398 plot(object, --x1, y1, reverse, color);
399 }
400 }
401 }
402 }
403 }
404 }
405
406 void
VGLBox(VGLBitmap * object,int x1,int y1,int x2,int y2,u_long color)407 VGLBox(VGLBitmap *object, int x1, int y1, int x2, int y2, u_long color)
408 {
409 VGLLine(object, x1, y1, x2, y1, color);
410 VGLLine(object, x2, y1, x2, y2, color);
411 VGLLine(object, x2, y2, x1, y2, color);
412 VGLLine(object, x1, y2, x1, y1, color);
413 }
414
415 void
VGLFilledBox(VGLBitmap * object,int x1,int y1,int x2,int y2,u_long color)416 VGLFilledBox(VGLBitmap *object, int x1, int y1, int x2, int y2, u_long color)
417 {
418 int y;
419
420 for (y=y1; y<=y2; y++) VGLLine(object, x1, y, x2, y, color);
421 }
422
423 static inline void
set4pixels(VGLBitmap * object,int x,int y,int xc,int yc,u_long color)424 set4pixels(VGLBitmap *object, int x, int y, int xc, int yc, u_long color)
425 {
426 if (x!=0) {
427 VGLSetXY(object, xc+x, yc+y, color);
428 VGLSetXY(object, xc-x, yc+y, color);
429 if (y!=0) {
430 VGLSetXY(object, xc+x, yc-y, color);
431 VGLSetXY(object, xc-x, yc-y, color);
432 }
433 }
434 else {
435 VGLSetXY(object, xc, yc+y, color);
436 if (y!=0)
437 VGLSetXY(object, xc, yc-y, color);
438 }
439 }
440
441 void
VGLEllipse(VGLBitmap * object,int xc,int yc,int a,int b,u_long color)442 VGLEllipse(VGLBitmap *object, int xc, int yc, int a, int b, u_long color)
443 {
444 int x = 0, y = b, asq = a*a, asq2 = a*a*2, bsq = b*b;
445 int bsq2 = b*b*2, d = bsq-asq*b+asq/4, dx = 0, dy = asq2*b;
446
447 while (dx<dy) {
448 set4pixels(object, x, y, xc, yc, color);
449 if (d>0) {
450 y--; dy-=asq2; d-=dy;
451 }
452 x++; dx+=bsq2; d+=bsq+dx;
453 }
454 d+=(3*(asq-bsq)/2-(dx+dy))/2;
455 while (y>=0) {
456 set4pixels(object, x, y, xc, yc, color);
457 if (d<0) {
458 x++; dx+=bsq2; d+=dx;
459 }
460 y--; dy-=asq2; d+=asq-dy;
461 }
462 }
463
464 static inline void
set2lines(VGLBitmap * object,int x,int y,int xc,int yc,u_long color)465 set2lines(VGLBitmap *object, int x, int y, int xc, int yc, u_long color)
466 {
467 if (x!=0) {
468 VGLLine(object, xc+x, yc+y, xc-x, yc+y, color);
469 if (y!=0)
470 VGLLine(object, xc+x, yc-y, xc-x, yc-y, color);
471 }
472 else {
473 VGLLine(object, xc, yc+y, xc, yc-y, color);
474 }
475 }
476
477 void
VGLFilledEllipse(VGLBitmap * object,int xc,int yc,int a,int b,u_long color)478 VGLFilledEllipse(VGLBitmap *object, int xc, int yc, int a, int b, u_long color)
479 {
480 int x = 0, y = b, asq = a*a, asq2 = a*a*2, bsq = b*b;
481 int bsq2 = b*b*2, d = bsq-asq*b+asq/4, dx = 0, dy = asq2*b;
482
483 while (dx<dy) {
484 set2lines(object, x, y, xc, yc, color);
485 if (d>0) {
486 y--; dy-=asq2; d-=dy;
487 }
488 x++; dx+=bsq2; d+=bsq+dx;
489 }
490 d+=(3*(asq-bsq)/2-(dx+dy))/2;
491 while (y>=0) {
492 set2lines(object, x, y, xc, yc, color);
493 if (d<0) {
494 x++; dx+=bsq2; d+=dx;
495 }
496 y--; dy-=asq2; d+=asq-dy;
497 }
498 }
499
500 void
VGLClear(VGLBitmap * object,u_long color)501 VGLClear(VGLBitmap *object, u_long color)
502 {
503 int offset;
504 int len;
505 int i, total = 0;
506 byte b[4];
507
508 VGLCheckSwitch();
509 VGLMouseFreeze(0, 0, object->Xsize, object->Ysize, color); /* XXX */
510 switch (object->Type) {
511 case MEMBUF:
512 case VIDBUF8:
513 memset(object->Bitmap, (byte)color, object->VXsize*object->VYsize);
514 break;
515
516 case VIDBUF8S:
517 for (offset = 0; offset < object->VXsize*object->VYsize; ) {
518 VGLSetSegment(offset);
519 len = min(object->VXsize*object->VYsize - offset,
520 VGLAdpInfo.va_window_size);
521 memset(object->Bitmap, (byte)color, len);
522 offset += len;
523 }
524 break;
525 case VIDBUF16:
526 case VIDBUF24:
527 case VIDBUF32:
528 color2mem(color, b, object->PixelBytes);
529 total = object->VXsize*object->VYsize*object->PixelBytes;
530 for (i = 0; i < total; i += object->PixelBytes)
531 bcopy(b, object->Bitmap + i, object->PixelBytes);
532 break;
533
534 case VIDBUF16S:
535 case VIDBUF24S:
536 case VIDBUF32S:
537 color2mem(color, b, object->PixelBytes);
538 total = object->VXsize*object->VYsize*object->PixelBytes;
539 for (offset = 0; offset < total; ) {
540 VGLSetSegment(offset);
541 len = min(total - offset, VGLAdpInfo.va_window_size);
542 for (i = 0; i < len; i += object->PixelBytes)
543 bcopy(b, object->Bitmap + offset + i, object->PixelBytes);
544 offset += len;
545 }
546 break;
547
548 case VIDBUF8X:
549 /* XXX works only for Xsize % 4 = 0 */
550 outb(0x3c6, 0xff);
551 outb(0x3c4, 0x02); outb(0x3c5, 0x0f);
552 memset(object->Bitmap, (byte)color, VGLAdpInfo.va_line_width*object->VYsize);
553 break;
554
555 case VIDBUF4:
556 case VIDBUF4S:
557 /* XXX works only for Xsize % 8 = 0 */
558 outb(0x3c4, 0x02); outb(0x3c5, 0x0f);
559 outb(0x3ce, 0x05); outb(0x3cf, 0x02); /* mode 2 */
560 outb(0x3ce, 0x01); outb(0x3cf, 0x00); /* set/reset enable */
561 outb(0x3ce, 0x08); outb(0x3cf, 0xff); /* bit mask */
562 for (offset = 0; offset < VGLAdpInfo.va_line_width*object->VYsize; ) {
563 VGLSetSegment(offset);
564 len = min(object->VXsize*object->VYsize - offset,
565 VGLAdpInfo.va_window_size);
566 memset(object->Bitmap, (byte)color, len);
567 offset += len;
568 }
569 outb(0x3ce, 0x05); outb(0x3cf, 0x00);
570 break;
571 }
572 VGLMouseUnFreeze();
573 }
574
575 void
VGLRestorePalette()576 VGLRestorePalette()
577 {
578 int i;
579
580 outb(0x3C6, 0xFF);
581 inb(0x3DA);
582 outb(0x3C8, 0x00);
583 for (i=0; i<256; i++) {
584 outb(0x3C9, VGLSavePaletteRed[i]);
585 inb(0x84);
586 outb(0x3C9, VGLSavePaletteGreen[i]);
587 inb(0x84);
588 outb(0x3C9, VGLSavePaletteBlue[i]);
589 inb(0x84);
590 }
591 inb(0x3DA);
592 outb(0x3C0, 0x20);
593 }
594
595 void
VGLSavePalette()596 VGLSavePalette()
597 {
598 int i;
599
600 outb(0x3C6, 0xFF);
601 inb(0x3DA);
602 outb(0x3C7, 0x00);
603 for (i=0; i<256; i++) {
604 VGLSavePaletteRed[i] = inb(0x3C9);
605 inb(0x84);
606 VGLSavePaletteGreen[i] = inb(0x3C9);
607 inb(0x84);
608 VGLSavePaletteBlue[i] = inb(0x3C9);
609 inb(0x84);
610 }
611 inb(0x3DA);
612 outb(0x3C0, 0x20);
613 }
614
615 void
VGLSetPalette(byte * red,byte * green,byte * blue)616 VGLSetPalette(byte *red, byte *green, byte *blue)
617 {
618 int i;
619
620 for (i=0; i<256; i++) {
621 VGLSavePaletteRed[i] = red[i];
622 VGLSavePaletteGreen[i] = green[i];
623 VGLSavePaletteBlue[i] = blue[i];
624 }
625 VGLCheckSwitch();
626 outb(0x3C6, 0xFF);
627 inb(0x3DA);
628 outb(0x3C8, 0x00);
629 for (i=0; i<256; i++) {
630 outb(0x3C9, VGLSavePaletteRed[i]);
631 inb(0x84);
632 outb(0x3C9, VGLSavePaletteGreen[i]);
633 inb(0x84);
634 outb(0x3C9, VGLSavePaletteBlue[i]);
635 inb(0x84);
636 }
637 inb(0x3DA);
638 outb(0x3C0, 0x20);
639 }
640
641 void
VGLSetPaletteIndex(byte color,byte red,byte green,byte blue)642 VGLSetPaletteIndex(byte color, byte red, byte green, byte blue)
643 {
644 VGLSavePaletteRed[color] = red;
645 VGLSavePaletteGreen[color] = green;
646 VGLSavePaletteBlue[color] = blue;
647 VGLCheckSwitch();
648 outb(0x3C6, 0xFF);
649 inb(0x3DA);
650 outb(0x3C8, color);
651 outb(0x3C9, red); outb(0x3C9, green); outb(0x3C9, blue);
652 inb(0x3DA);
653 outb(0x3C0, 0x20);
654 }
655
656 void
VGLSetBorder(byte color)657 VGLSetBorder(byte color)
658 {
659 VGLCheckSwitch();
660 inb(0x3DA);
661 outb(0x3C0,0x11); outb(0x3C0, color);
662 inb(0x3DA);
663 outb(0x3C0, 0x20);
664 }
665
666 void
VGLBlankDisplay(int blank)667 VGLBlankDisplay(int blank)
668 {
669 byte val;
670
671 VGLCheckSwitch();
672 outb(0x3C4, 0x01); val = inb(0x3C5); outb(0x3C4, 0x01);
673 outb(0x3C5, ((blank) ? (val |= 0x20) : (val &= 0xDF)));
674 }
675