2 * Mesa 3-D graphics library
5 * Copyright (C) 1999 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 * DOS/DJGPP device driver v1.6 for Mesa
28 * Copyright (C) 2002 - Borca Daniel
29 * Email : dborca@users.sourceforge.net
30 * Web : http://www.geocities.com/dborca
32 * Thanks to CrazyPyro (Neil Funk) for FakeColor
45 static vl_driver
*drv
;
46 /* based upon mode specific data: valid entire session */
47 int vl_video_selector
;
48 static vl_mode
*video_mode
;
49 static int video_scanlen
, video_bypp
;
50 /* valid until next buffer */
51 void *vl_current_draw_buffer
, *vl_current_read_buffer
;
52 int vl_current_stride
, vl_current_width
, vl_current_height
, vl_current_bytes
;
53 int vl_current_offset
, vl_current_delta
;
57 /* These lookup tables are used to extract RGB values in [0,255]
58 * from 15/16-bit pixel values.
60 static unsigned char pix15r
[0x8000];
61 static unsigned char pix15g
[0x8000];
62 static unsigned char pix15b
[0x8000];
63 static unsigned char pix16r
[0x10000];
64 static unsigned char pix16g
[0x10000];
65 static unsigned char pix16b
[0x10000];
67 /* lookup table for scaling 5 bit colors up to 8 bits */
68 static int _rgb_scale_5
[32] = {
69 0, 8, 16, 25, 33, 41, 49, 58,
70 66, 74, 82, 90, 99, 107, 115, 123,
71 132, 140, 148, 156, 165, 173, 181, 189,
72 197, 206, 214, 222, 230, 239, 247, 255
76 /* lookup table for scaling 6 bit colors up to 8 bits */
77 static int _rgb_scale_6
[64] = {
78 0, 4, 8, 12, 16, 20, 24, 28,
79 32, 36, 40, 45, 49, 53, 57, 61,
80 65, 69, 73, 77, 81, 85, 89, 93,
81 97, 101, 105, 109, 113, 117, 121, 125,
82 130, 134, 138, 142, 146, 150, 154, 158,
83 162, 166, 170, 174, 178, 182, 186, 190,
84 194, 198, 202, 206, 210, 215, 219, 223,
85 227, 231, 235, 239, 243, 247, 251, 255
97 static word32 VGAPalette
[256];
98 static word8 array_r
[256];
99 static word8 array_g
[256];
100 static word8 array_b
[256];
103 int (*vl_mixfix
) (fixed r
, fixed g
, fixed b
);
104 int (*vl_mixrgb
) (const unsigned char rgb
[]);
105 int (*vl_mixrgba
) (const unsigned char rgba
[]);
106 void (*vl_getrgba
) (unsigned int offset
, unsigned char rgba
[4]);
107 int (*vl_getpixel
) (unsigned int offset
);
108 void (*vl_clear
) (int color
);
109 void (*vl_rect
) (int x
, int y
, int width
, int height
, int color
);
110 void (*vl_flip
) (void);
111 void (*vl_putpixel
) (unsigned int offset
, int color
);
114 /* Desc: color composition (w/o ALPHA)
122 vl_mixfix8fake (fixed r
, fixed g
, fixed b
)
124 return array_b
[b
>>FIXED_SHIFT
]*G_CNT
*R_CNT
125 + array_g
[g
>>FIXED_SHIFT
]*R_CNT
126 + array_r
[r
>>FIXED_SHIFT
];
128 #define vl_mixfix8 vl_mixfix8fake
130 vl_mixfix15 (fixed r
, fixed g
, fixed b
)
132 return ((r
>>(3+FIXED_SHIFT
))<<10)
133 |((g
>>(3+FIXED_SHIFT
))<<5)
134 | (b
>>(3+FIXED_SHIFT
));
137 vl_mixfix16 (fixed r
, fixed g
, fixed b
)
139 return ((r
>>(3+FIXED_SHIFT
))<<11)
140 |((g
>>(2+FIXED_SHIFT
))<<5)
141 | (b
>>(3+FIXED_SHIFT
));
143 #define vl_mixfix24 vl_mixfix32
145 vl_mixfix32 (fixed r
, fixed g
, fixed b
)
147 return ((r
>>FIXED_SHIFT
)<<16)
148 |((g
>>FIXED_SHIFT
)<<8)
153 /* Desc: color composition (w/ ALPHA)
155 * In : array of integers (R, G, B, A)
160 #define vl_mixrgba8 vl_mixrgb8fake
161 #define vl_mixrgba15 vl_mixrgb15
162 #define vl_mixrgba16 vl_mixrgb16
163 #define vl_mixrgba24 vl_mixrgb24
165 vl_mixrgba32 (const unsigned char rgba
[])
168 * currently, DMesa uses Mesa's alpha buffer;
169 * so we don't really care about alpha value here...
171 return /*(rgba[3]<<24) | */(rgba
[0]<<16) | (rgba
[1]<<8) | (rgba
[2]);
175 /* Desc: color composition (w/o ALPHA)
177 * In : array of integers (R, G, B)
183 vl_mixrgb8fake (const unsigned char rgb
[])
185 return array_b
[rgb
[2]]*G_CNT
*R_CNT
186 + array_g
[rgb
[1]]*R_CNT
189 #define vl_mixrgb8 vl_mixrgb8fake
191 vl_mixrgb15 (const unsigned char rgb
[])
193 return ((rgb
[0]>>3)<<10) | ((rgb
[1]>>3)<<5) | (rgb
[2]>>3);
196 vl_mixrgb16 (const unsigned char rgb
[])
198 return ((rgb
[0]>>3)<<11) | ((rgb
[1]>>2)<<5) | (rgb
[2]>>3);
200 #define vl_mixrgb24 vl_mixrgb32
202 vl_mixrgb32 (const unsigned char rgb
[])
204 return (rgb
[0]<<16) | (rgb
[1]<<8) | (rgb
[2]);
208 /* Desc: color decomposition
210 * In : pixel offset, array of integers to hold color components (R, G, B, A)
213 * Note: uses current read buffer
216 v_getrgba8fake6 (unsigned int offset
, unsigned char rgba
[4])
218 word32 c
= VGAPalette
[((word8
*)vl_current_read_buffer
)[offset
]];
219 rgba
[0] = _rgb_scale_6
[(c
>> 16) & 0x3F];
220 rgba
[1] = _rgb_scale_6
[(c
>> 8) & 0x3F];
221 rgba
[2] = _rgb_scale_6
[ c
& 0x3F];
222 /*rgba[3] = c >> 24;*/ /* dummy alpha; we have separate SW alpha, so ignore */
225 v_getrgba8fake8 (unsigned int offset
, unsigned char rgba
[4])
227 word32 c
= VGAPalette
[((word8
*)vl_current_read_buffer
)[offset
]];
231 /*rgba[3] = c >> 24;*/ /* dummy alpha; we have separate SW alpha, so ignore */
233 #define v_getrgba8 v_getrgba8fake6
235 v_getrgba15 (unsigned int offset
, unsigned char rgba
[4])
237 word32 c
= ((word16
*)vl_current_read_buffer
)[offset
];
244 rgba
[0] = _rgb_scale_5
[(c
>> 10) & 0x1F];
245 rgba
[1] = _rgb_scale_5
[(c
>> 5) & 0x1F];
246 rgba
[2] = _rgb_scale_5
[ c
& 0x1F];
248 /*rgba[3] = 255;*/ /* dummy alpha; we have separate SW alpha, so ignore */
251 v_getrgba16 (unsigned int offset
, unsigned char rgba
[4])
253 word32 c
= ((word16
*)vl_current_read_buffer
)[offset
];
259 rgba
[0] = _rgb_scale_5
[(c
>> 11) & 0x1F];
260 rgba
[1] = _rgb_scale_6
[(c
>> 5) & 0x3F];
261 rgba
[2] = _rgb_scale_5
[ c
& 0x1F];
263 /*rgba[3] = 255;*/ /* dummy alpha; we have separate SW alpha, so ignore */
266 v_getrgba24 (unsigned int offset
, unsigned char rgba
[4])
268 word32 c
= *(word32
*)((long)vl_current_read_buffer
+offset
*3);
272 /*rgba[3] = 255;*/ /* dummy alpha; we have separate SW alpha, so ignore */
275 v_getrgba32 (unsigned int offset
, unsigned char rgba
[4])
277 word32 c
= ((word32
*)vl_current_read_buffer
)[offset
];
281 /*rgba[3] = c >> 24;*/ /* dummy alpha; we have separate SW alpha, so ignore */
285 /* Desc: pixel retrieval
290 * Note: uses current read buffer
293 v_getpixel8 (unsigned int offset
)
295 return ((word8
*)vl_current_read_buffer
)[offset
];
297 #define v_getpixel15 v_getpixel16
299 v_getpixel16 (unsigned int offset
)
301 return ((word16
*)vl_current_read_buffer
)[offset
];
304 v_getpixel24 (unsigned int offset
)
306 return *(word32
*)((long)vl_current_read_buffer
+offset
*3);
309 v_getpixel32 (unsigned int offset
)
311 return ((word32
*)vl_current_read_buffer
)[offset
];
315 /* Desc: set one palette entry
317 * In : index, R, G, B
320 * Note: color components are in range [0.0 .. 1.0]
323 vl_setCI (int index
, float red
, float green
, float blue
)
325 drv
->setCI_f(index
, red
, green
, blue
);
329 /* Desc: set one palette entry
331 * In : color, R, G, B
337 fake_setcolor (int c
, int r
, int g
, int b
)
339 VGAPalette
[c
] = 0xff000000 | (r
<<16) | (g
<<8) | b
;
341 drv
->setCI_i(c
, r
, g
, b
);
345 /* Desc: build FakeColor palette
347 * In : CI precision in bits
353 fake_buildpalette (int bits
)
355 double c_r
, c_g
, c_b
;
356 int r
, g
, b
, color
= 0;
358 double max
= (1 << bits
) - 1;
360 for (b
= 0; b
< B_CNT
; ++b
) {
361 for (g
= 0; g
< G_CNT
; ++g
) {
362 for (r
= 0; r
< R_CNT
; ++r
) {
363 c_r
= 0.5 + (double)r
* (max
-R_BIAS
) / (R_CNT
-1.) + R_BIAS
;
364 c_g
= 0.5 + (double)g
* (max
-G_BIAS
) / (G_CNT
-1.) + G_BIAS
;
365 c_b
= 0.5 + (double)b
* (max
-B_BIAS
) / (B_CNT
-1.) + B_BIAS
;
366 fake_setcolor(color
++, (int)c_r
, (int)c_g
, (int)c_b
);
371 for (color
= 0; color
< 256; color
++) {
372 c_r
= (double)color
* R_CNT
/ 256.;
373 c_g
= (double)color
* G_CNT
/ 256.;
374 c_b
= (double)color
* B_CNT
/ 256.;
375 array_r
[color
] = (int)c_r
;
376 array_g
[color
] = (int)c_g
;
377 array_b
[color
] = (int)c_b
;
383 /* Desc: initialize lookup arrays
391 v_init_pixeltables (void)
395 for (pixel
= 0; pixel
<= 0xffff; pixel
++) {
396 unsigned int r
, g
, b
;
398 if (pixel
<= 0x7fff) {
400 r
= (pixel
& 0x7c00) >> 8;
401 g
= (pixel
& 0x03E0) >> 3;
402 b
= (pixel
& 0x001F) << 2;
404 r
= (unsigned int)(((double)r
* 255. / 0x7c) + 0.5);
405 g
= (unsigned int)(((double)g
* 255. / 0x7c) + 0.5);
406 b
= (unsigned int)(((double)b
* 255. / 0x7c) + 0.5);
414 r
= (pixel
& 0xF800) >> 8;
415 g
= (pixel
& 0x07E0) >> 3;
416 b
= (pixel
& 0x001F) << 3;
418 r
= (unsigned int)(((double)r
* 255. / 0xF8) + 0.5);
419 g
= (unsigned int)(((double)g
* 255. / 0xFC) + 0.5);
420 b
= (unsigned int)(((double)b
* 255. / 0xF8) + 0.5);
430 /* Desc: initialize hardware
433 * Out : list of available modes
435 * Note: when returning non-NULL, global variable `drv' is guaranteed to be ok
440 static vl_mode
*q
= NULL
;
443 /* are we forced to NUL driver? */
444 if (getenv("DMESA_NULDRV")) {
445 if ((q
= NUL
.init()) != NULL
) {
450 /* initialize hardware */
451 if ((q
= VESA
.init()) != NULL
) {
453 } else if ((q
= VGA
.init()) != NULL
) {
464 /* Desc: sync buffer with video hardware
466 * In : ptr to old buffer, position, size
472 vl_sync_buffer (void **buffer
, int x
, int y
, int width
, int height
)
474 if ((width
& 7) || (x
< 0) || (y
< 0) || (x
+width
> video_mode
->xres
) || (y
+height
> video_mode
->yres
)) {
477 void *newbuf
= *buffer
;
479 if ((newbuf
== NULL
) || (vl_current_width
!= width
) || (vl_current_height
!= height
)) {
480 newbuf
= realloc(newbuf
, width
* height
* video_bypp
);
483 if (newbuf
== NULL
) {
487 vl_current_width
= width
;
488 vl_current_height
= height
;
489 vl_current_stride
= vl_current_width
* video_bypp
;
490 vl_current_bytes
= vl_current_stride
* height
;
492 vl_current_offset
= video_scanlen
* y
+ video_bypp
* x
;
493 vl_current_delta
= video_scanlen
- vl_current_stride
;
495 vl_current_draw_buffer
= vl_current_read_buffer
= *buffer
= newbuf
;
501 /* Desc: state retrieval
504 * Out : -1 for an error
509 vl_get (int pname
, int *params
)
512 case VL_GET_SCREEN_SIZE
:
513 params
[0] = video_mode
->xres
;
514 params
[1] = video_mode
->yres
;
516 case VL_GET_VIDEO_MODES
: {
519 if ((q
= v_init_hw()) == NULL
) {
522 /* count available visuals */
523 for (n
= 0; q
->mode
!= 0xffff; q
++) {
524 if ((q
+ 1)->mode
== (q
->mode
| 0x4000)) {
525 /* same mode, but linear */
536 return (drv
!= NULL
) ? drv
->get(pname
, params
) : -1;
544 * In : ptr to mode definition
550 vl_setup_mode (vl_mode
*p
)
556 #define INITPTR(bpp) \
557 vl_putpixel = v_putpixel##bpp; \
558 vl_getrgba = v_getrgba##bpp; \
559 vl_getpixel = v_getpixel##bpp; \
560 vl_rect = v_rect##bpp; \
561 vl_mixfix = vl_mixfix##bpp; \
562 vl_mixrgb = vl_mixrgb##bpp; \
563 vl_mixrgba = vl_mixrgba##bpp; \
564 vl_clear = _can_mmx() ? v_clear##bpp##_mmx : v_clear##bpp
589 video_bypp
= (p
->bpp
+7)/8;
590 video_scanlen
= p
->scanlen
;
591 vl_video_selector
= p
->sel
;
597 /* Desc: restore to the mode prior to first call to `vl_video_init'.
615 * In : xres, yres, bits/pixel, RGB, refresh rate
616 * Out : pixel width in bits if success
621 vl_video_init (int width
, int height
, int bpp
, int rgb
, int refresh
)
630 } else if (bpp
== 8) {
635 v_init_pixeltables();
639 /* initialize hardware */
640 if ((q
= v_init_hw()) == NULL
) {
644 /* search for a mode that fits our request */
645 for (min
= -1, p
= NULL
; q
->mode
!= 0xffff; q
++) {
646 if ((q
->xres
>= width
) && (q
->yres
>= height
) && (q
->bpp
== bpp
)) {
647 if (min
>= (unsigned)(q
->xres
* q
->yres
)) {
648 min
= q
->xres
* q
->yres
;
654 /* setup and enter mode */
655 if ((vl_setup_mode(p
) == 0) && (drv
->entermode(p
, refresh
) == 0)) {
658 drv
->get(VL_GET_CI_PREC
, (int *)(&min
));
659 fake_buildpalette(min
);
661 vl_getrgba
= v_getrgba8fake8
;