| 1 |
/* |
| 2 |
* video_vosf.h - Video/graphics emulation, video on SEGV signals support |
| 3 |
* |
| 4 |
* Basilisk II (C) 1997-2004 Christian Bauer |
| 5 |
* |
| 6 |
* This program is free software; you can redistribute it and/or modify |
| 7 |
* it under the terms of the GNU General Public License as published by |
| 8 |
* the Free Software Foundation; either version 2 of the License, or |
| 9 |
* (at your option) any later version. |
| 10 |
* |
| 11 |
* This program is distributed in the hope that it will be useful, |
| 12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
* GNU General Public License for more details. |
| 15 |
* |
| 16 |
* You should have received a copy of the GNU General Public License |
| 17 |
* along with this program; if not, write to the Free Software |
| 18 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 |
*/ |
| 20 |
|
| 21 |
#ifndef VIDEO_VOSF_H |
| 22 |
#define VIDEO_VOSF_H |
| 23 |
|
| 24 |
// Note: this file must be #include'd only in video_x.cpp |
| 25 |
#ifdef ENABLE_VOSF |
| 26 |
|
| 27 |
#include <fcntl.h> |
| 28 |
#include <sys/mman.h> |
| 29 |
#include "sigsegv.h" |
| 30 |
#include "vm_alloc.h" |
| 31 |
|
| 32 |
// Glue for SDL and X11 support |
| 33 |
#ifdef USE_SDL_VIDEO |
| 34 |
#define MONITOR_INIT SDL_monitor_desc &monitor |
| 35 |
#define VIDEO_DRV_INIT driver_window *drv |
| 36 |
#define VIDEO_DRV_ROW_BYTES drv->s->pitch |
| 37 |
#define VIDEO_DRV_LOCK_PIXELS if (SDL_MUSTLOCK(drv->s)) SDL_LockSurface(drv->s) |
| 38 |
#define VIDEO_DRV_UNLOCK_PIXELS if (SDL_MUSTLOCK(drv->s)) SDL_UnlockSurface(drv->s) |
| 39 |
#else |
| 40 |
#ifdef SHEEPSHAVER |
| 41 |
#define MONITOR_INIT /* nothing */ |
| 42 |
#define VIDEO_DRV_INIT /* nothing */ |
| 43 |
#define VIDEO_DRV_WINDOW the_win |
| 44 |
#define VIDEO_DRV_GC the_gc |
| 45 |
#define VIDEO_DRV_IMAGE img |
| 46 |
#define VIDEO_DRV_HAVE_SHM have_shm |
| 47 |
#else |
| 48 |
#define MONITOR_INIT X11_monitor_desc &monitor |
| 49 |
#define VIDEO_DRV_INIT driver_window *drv |
| 50 |
#define VIDEO_DRV_WINDOW drv->w |
| 51 |
#define VIDEO_DRV_GC drv->gc |
| 52 |
#define VIDEO_DRV_IMAGE drv->img |
| 53 |
#define VIDEO_DRV_HAVE_SHM drv->have_shm |
| 54 |
#endif |
| 55 |
#define VIDEO_DRV_LOCK_PIXELS /* nothing */ |
| 56 |
#define VIDEO_DRV_UNLOCK_PIXELS /* nothing */ |
| 57 |
#define VIDEO_DRV_ROW_BYTES VIDEO_DRV_IMAGE->bytes_per_line |
| 58 |
#endif |
| 59 |
|
| 60 |
// Variables for Video on SEGV support |
| 61 |
static uint8 *the_host_buffer; // Host frame buffer in VOSF mode |
| 62 |
|
| 63 |
struct ScreenPageInfo { |
| 64 |
int top, bottom; // Mapping between this virtual page and Mac scanlines |
| 65 |
}; |
| 66 |
|
| 67 |
struct ScreenInfo { |
| 68 |
uintptr memStart; // Start address aligned to page boundary |
| 69 |
uint32 memLength; // Length of the memory addressed by the screen pages |
| 70 |
|
| 71 |
uintptr pageSize; // Size of a page |
| 72 |
int pageBits; // Shift count to get the page number |
| 73 |
uint32 pageCount; // Number of pages allocated to the screen |
| 74 |
|
| 75 |
bool dirty; // Flag: set if the frame buffer was touched |
| 76 |
char * dirtyPages; // Table of flags set if page was altered |
| 77 |
ScreenPageInfo * pageInfo; // Table of mappings page -> Mac scanlines |
| 78 |
}; |
| 79 |
|
| 80 |
static ScreenInfo mainBuffer; |
| 81 |
|
| 82 |
#define PFLAG_SET_VALUE 0x00 |
| 83 |
#define PFLAG_CLEAR_VALUE 0x01 |
| 84 |
#define PFLAG_SET_VALUE_4 0x00000000 |
| 85 |
#define PFLAG_CLEAR_VALUE_4 0x01010101 |
| 86 |
#define PFLAG_SET(page) mainBuffer.dirtyPages[page] = PFLAG_SET_VALUE |
| 87 |
#define PFLAG_CLEAR(page) mainBuffer.dirtyPages[page] = PFLAG_CLEAR_VALUE |
| 88 |
#define PFLAG_ISSET(page) (mainBuffer.dirtyPages[page] == PFLAG_SET_VALUE) |
| 89 |
#define PFLAG_ISCLEAR(page) (mainBuffer.dirtyPages[page] != PFLAG_SET_VALUE) |
| 90 |
|
| 91 |
#ifdef UNALIGNED_PROFITABLE |
| 92 |
# define PFLAG_ISSET_4(page) (*((uint32 *)(mainBuffer.dirtyPages + (page))) == PFLAG_SET_VALUE_4) |
| 93 |
# define PFLAG_ISCLEAR_4(page) (*((uint32 *)(mainBuffer.dirtyPages + (page))) == PFLAG_CLEAR_VALUE_4) |
| 94 |
#else |
| 95 |
# define PFLAG_ISSET_4(page) \ |
| 96 |
PFLAG_ISSET(page ) && PFLAG_ISSET(page+1) \ |
| 97 |
&& PFLAG_ISSET(page+2) && PFLAG_ISSET(page+3) |
| 98 |
# define PFLAG_ISCLEAR_4(page) \ |
| 99 |
PFLAG_ISCLEAR(page ) && PFLAG_ISCLEAR(page+1) \ |
| 100 |
&& PFLAG_ISCLEAR(page+2) && PFLAG_ISCLEAR(page+3) |
| 101 |
#endif |
| 102 |
|
| 103 |
// Set the selected page range [ first_page, last_page [ into the SET state |
| 104 |
#define PFLAG_SET_RANGE(first_page, last_page) \ |
| 105 |
memset(mainBuffer.dirtyPages + (first_page), PFLAG_SET_VALUE, \ |
| 106 |
(last_page) - (first_page)) |
| 107 |
|
| 108 |
// Set the selected page range [ first_page, last_page [ into the CLEAR state |
| 109 |
#define PFLAG_CLEAR_RANGE(first_page, last_page) \ |
| 110 |
memset(mainBuffer.dirtyPages + (first_page), PFLAG_CLEAR_VALUE, \ |
| 111 |
(last_page) - (first_page)) |
| 112 |
|
| 113 |
#define PFLAG_SET_ALL do { \ |
| 114 |
PFLAG_SET_RANGE(0, mainBuffer.pageCount); \ |
| 115 |
mainBuffer.dirty = true; \ |
| 116 |
} while (0) |
| 117 |
|
| 118 |
#define PFLAG_CLEAR_ALL do { \ |
| 119 |
PFLAG_CLEAR_RANGE(0, mainBuffer.pageCount); \ |
| 120 |
mainBuffer.dirty = false; \ |
| 121 |
} while (0) |
| 122 |
|
| 123 |
// Set the following macro definition to 1 if your system |
| 124 |
// provides a really fast strchr() implementation |
| 125 |
//#define HAVE_FAST_STRCHR 0 |
| 126 |
|
| 127 |
static inline int find_next_page_set(int page) |
| 128 |
{ |
| 129 |
#if HAVE_FAST_STRCHR |
| 130 |
char *match = strchr(mainBuffer.dirtyPages + page, PFLAG_SET_VALUE); |
| 131 |
return match ? match - mainBuffer.dirtyPages : mainBuffer.pageCount; |
| 132 |
#else |
| 133 |
while (PFLAG_ISCLEAR_4(page)) |
| 134 |
page += 4; |
| 135 |
while (PFLAG_ISCLEAR(page)) |
| 136 |
page++; |
| 137 |
return page; |
| 138 |
#endif |
| 139 |
} |
| 140 |
|
| 141 |
static inline int find_next_page_clear(int page) |
| 142 |
{ |
| 143 |
#if HAVE_FAST_STRCHR |
| 144 |
char *match = strchr(mainBuffer.dirtyPages + page, PFLAG_CLEAR_VALUE); |
| 145 |
return match ? match - mainBuffer.dirtyPages : mainBuffer.pageCount; |
| 146 |
#else |
| 147 |
while (PFLAG_ISSET_4(page)) |
| 148 |
page += 4; |
| 149 |
while (PFLAG_ISSET(page)) |
| 150 |
page++; |
| 151 |
return page; |
| 152 |
#endif |
| 153 |
} |
| 154 |
|
| 155 |
#ifdef HAVE_SPINLOCKS |
| 156 |
static spinlock_t vosf_lock = SPIN_LOCK_UNLOCKED; // Mutex to protect frame buffer (dirtyPages in fact) |
| 157 |
#define LOCK_VOSF spin_lock(&vosf_lock) |
| 158 |
#define UNLOCK_VOSF spin_unlock(&vosf_lock) |
| 159 |
#elif defined(HAVE_PTHREADS) |
| 160 |
static pthread_mutex_t vosf_lock = PTHREAD_MUTEX_INITIALIZER; // Mutex to protect frame buffer (dirtyPages in fact) |
| 161 |
#define LOCK_VOSF pthread_mutex_lock(&vosf_lock); |
| 162 |
#define UNLOCK_VOSF pthread_mutex_unlock(&vosf_lock); |
| 163 |
#else |
| 164 |
#define LOCK_VOSF |
| 165 |
#define UNLOCK_VOSF |
| 166 |
#endif |
| 167 |
|
| 168 |
static int log_base_2(uint32 x) |
| 169 |
{ |
| 170 |
uint32 mask = 0x80000000; |
| 171 |
int l = 31; |
| 172 |
while (l >= 0 && (x & mask) == 0) { |
| 173 |
mask >>= 1; |
| 174 |
l--; |
| 175 |
} |
| 176 |
return l; |
| 177 |
} |
| 178 |
|
| 179 |
// Extend size to page boundary |
| 180 |
static uint32 page_extend(uint32 size) |
| 181 |
{ |
| 182 |
const uint32 page_size = getpagesize(); |
| 183 |
const uint32 page_mask = page_size - 1; |
| 184 |
return (size + page_mask) & ~page_mask; |
| 185 |
} |
| 186 |
|
| 187 |
|
| 188 |
/* |
| 189 |
* Check if VOSF acceleration is profitable on this platform |
| 190 |
*/ |
| 191 |
|
| 192 |
const int VOSF_PROFITABLE_TRIES = 3; // Make 3 attempts for full screen update |
| 193 |
const int VOSF_PROFITABLE_THRESHOLD = 16667; // 60 Hz |
| 194 |
|
| 195 |
static bool video_vosf_profitable(void) |
| 196 |
{ |
| 197 |
int64 durations[VOSF_PROFITABLE_TRIES]; |
| 198 |
int mean_duration = 0; |
| 199 |
|
| 200 |
for (int i = 0; i < VOSF_PROFITABLE_TRIES; i++) { |
| 201 |
uint64 start = GetTicks_usec(); |
| 202 |
for (int p = 0; p < mainBuffer.pageCount; p++) { |
| 203 |
uint8 *addr = (uint8 *)(mainBuffer.memStart + (p * mainBuffer.pageSize)); |
| 204 |
addr[0] = 0; // Trigger Screen_fault_handler() |
| 205 |
} |
| 206 |
int64 duration = GetTicks_usec() - start; |
| 207 |
mean_duration += duration; |
| 208 |
durations[i] = duration; |
| 209 |
|
| 210 |
PFLAG_CLEAR_ALL; |
| 211 |
mainBuffer.dirty = false; |
| 212 |
if (vm_protect((char *)mainBuffer.memStart, mainBuffer.memLength, VM_PAGE_READ) != 0) |
| 213 |
return false; |
| 214 |
} |
| 215 |
|
| 216 |
mean_duration /= VOSF_PROFITABLE_TRIES; |
| 217 |
D(bug("Triggered %d screen faults in %ld usec on average\n", mainBuffer.pageCount, mean_duration)); |
| 218 |
return (mean_duration < (VOSF_PROFITABLE_THRESHOLD * (frame_skip ? frame_skip : 1))); |
| 219 |
} |
| 220 |
|
| 221 |
|
| 222 |
/* |
| 223 |
* Initialize the VOSF system (mainBuffer structure, SIGSEGV handler) |
| 224 |
*/ |
| 225 |
|
| 226 |
static bool video_vosf_init(MONITOR_INIT) |
| 227 |
{ |
| 228 |
VIDEO_MODE_INIT_MONITOR; |
| 229 |
|
| 230 |
const uintptr page_size = getpagesize(); |
| 231 |
const uintptr page_mask = page_size - 1; |
| 232 |
|
| 233 |
// Round up frame buffer base to page boundary |
| 234 |
mainBuffer.memStart = (((uintptr) the_buffer) + page_mask) & ~page_mask; |
| 235 |
|
| 236 |
// The frame buffer size shall already be aligned to page boundary (use page_extend) |
| 237 |
mainBuffer.memLength = the_buffer_size; |
| 238 |
|
| 239 |
mainBuffer.pageSize = page_size; |
| 240 |
mainBuffer.pageBits = log_base_2(mainBuffer.pageSize); |
| 241 |
mainBuffer.pageCount = (mainBuffer.memLength + page_mask)/mainBuffer.pageSize; |
| 242 |
|
| 243 |
// The "2" more bytes requested are a safety net to insure the |
| 244 |
// loops in the update routines will terminate. |
| 245 |
// See "How can we deal with array overrun conditions ?" hereunder for further details. |
| 246 |
mainBuffer.dirtyPages = (char *) malloc(mainBuffer.pageCount + 2); |
| 247 |
if (mainBuffer.dirtyPages == NULL) |
| 248 |
return false; |
| 249 |
|
| 250 |
PFLAG_CLEAR_ALL; |
| 251 |
PFLAG_CLEAR(mainBuffer.pageCount); |
| 252 |
PFLAG_SET(mainBuffer.pageCount+1); |
| 253 |
|
| 254 |
// Allocate and fill in pageInfo with start and end (inclusive) row in number of bytes |
| 255 |
mainBuffer.pageInfo = (ScreenPageInfo *) malloc(mainBuffer.pageCount * sizeof(ScreenPageInfo)); |
| 256 |
if (mainBuffer.pageInfo == NULL) |
| 257 |
return false; |
| 258 |
|
| 259 |
uint32 a = 0; |
| 260 |
for (unsigned i = 0; i < mainBuffer.pageCount; i++) { |
| 261 |
unsigned y1 = a / VIDEO_MODE_ROW_BYTES; |
| 262 |
if (y1 >= VIDEO_MODE_Y) |
| 263 |
y1 = VIDEO_MODE_Y - 1; |
| 264 |
|
| 265 |
unsigned y2 = (a + mainBuffer.pageSize) / VIDEO_MODE_ROW_BYTES; |
| 266 |
if (y2 >= VIDEO_MODE_Y) |
| 267 |
y2 = VIDEO_MODE_Y - 1; |
| 268 |
|
| 269 |
mainBuffer.pageInfo[i].top = y1; |
| 270 |
mainBuffer.pageInfo[i].bottom = y2; |
| 271 |
|
| 272 |
a += mainBuffer.pageSize; |
| 273 |
if (a > mainBuffer.memLength) |
| 274 |
a = mainBuffer.memLength; |
| 275 |
} |
| 276 |
|
| 277 |
// We can now write-protect the frame buffer |
| 278 |
if (vm_protect((char *)mainBuffer.memStart, mainBuffer.memLength, VM_PAGE_READ) != 0) |
| 279 |
return false; |
| 280 |
|
| 281 |
// The frame buffer is sane, i.e. there is no write to it yet |
| 282 |
mainBuffer.dirty = false; |
| 283 |
return true; |
| 284 |
} |
| 285 |
|
| 286 |
|
| 287 |
/* |
| 288 |
* Deinitialize VOSF system |
| 289 |
*/ |
| 290 |
|
| 291 |
static void video_vosf_exit(void) |
| 292 |
{ |
| 293 |
if (mainBuffer.pageInfo) { |
| 294 |
free(mainBuffer.pageInfo); |
| 295 |
mainBuffer.pageInfo = NULL; |
| 296 |
} |
| 297 |
if (mainBuffer.dirtyPages) { |
| 298 |
free(mainBuffer.dirtyPages); |
| 299 |
mainBuffer.dirtyPages = NULL; |
| 300 |
} |
| 301 |
} |
| 302 |
|
| 303 |
|
| 304 |
/* |
| 305 |
* Screen fault handler |
| 306 |
*/ |
| 307 |
|
| 308 |
bool Screen_fault_handler(sigsegv_address_t fault_address, sigsegv_address_t fault_instruction) |
| 309 |
{ |
| 310 |
const uintptr addr = (uintptr)fault_address; |
| 311 |
|
| 312 |
/* Someone attempted to write to the frame buffer. Make it writeable |
| 313 |
* now so that the data could actually be written to. It will be made |
| 314 |
* read-only back in one of the screen update_*() functions. |
| 315 |
*/ |
| 316 |
if (((uintptr)addr - mainBuffer.memStart) < mainBuffer.memLength) { |
| 317 |
const int page = ((uintptr)addr - mainBuffer.memStart) >> mainBuffer.pageBits; |
| 318 |
LOCK_VOSF; |
| 319 |
PFLAG_SET(page); |
| 320 |
vm_protect((char *)(addr & -mainBuffer.pageSize), mainBuffer.pageSize, VM_PAGE_READ | VM_PAGE_WRITE); |
| 321 |
mainBuffer.dirty = true; |
| 322 |
UNLOCK_VOSF; |
| 323 |
return true; |
| 324 |
} |
| 325 |
|
| 326 |
/* Otherwise, we don't know how to handle the fault, let it crash */ |
| 327 |
return false; |
| 328 |
} |
| 329 |
|
| 330 |
|
| 331 |
/* |
| 332 |
* Update display for Windowed mode and VOSF |
| 333 |
*/ |
| 334 |
|
| 335 |
/* How can we deal with array overrun conditions ? |
| 336 |
|
| 337 |
The state of the framebuffer pages that have been touched are maintained |
| 338 |
in the dirtyPages[] table. That table is (pageCount + 2) bytes long. |
| 339 |
|
| 340 |
Terminology |
| 341 |
|
| 342 |
"Last Page" denotes the pageCount-nth page, i.e. dirtyPages[pageCount - 1]. |
| 343 |
"CLEAR Page Guard" refers to the page following the Last Page but is always |
| 344 |
in the CLEAR state. "SET Page Guard" refers to the page following the CLEAR |
| 345 |
Page Guard but is always in the SET state. |
| 346 |
|
| 347 |
Rough process |
| 348 |
|
| 349 |
The update routines must determine which pages have to be blitted to the |
| 350 |
screen. This job consists in finding the first_page that was touched. |
| 351 |
i.e. find the next page that is SET. Then, finding how many pages were |
| 352 |
touched starting from first_page. i.e. find the next page that is CLEAR. |
| 353 |
|
| 354 |
There are two cases to check: |
| 355 |
|
| 356 |
- Last Page is CLEAR: find_next_page_set() will reach the SET Page Guard |
| 357 |
but it is beyond the valid pageCount value. Therefore, we exit from the |
| 358 |
update routine. |
| 359 |
|
| 360 |
- Last Page is SET: first_page equals (pageCount - 1) and |
| 361 |
find_next_page_clear() will reach the CLEAR Page Guard. We blit the last |
| 362 |
page to the screen. On the next iteration, page equals pageCount and |
| 363 |
find_next_page_set() will reach the SET Page Guard. We still safely exit |
| 364 |
from the update routine because the SET Page Guard position is greater |
| 365 |
than pageCount. |
| 366 |
*/ |
| 367 |
|
| 368 |
static inline void update_display_window_vosf(VIDEO_DRV_INIT) |
| 369 |
{ |
| 370 |
VIDEO_MODE_INIT; |
| 371 |
|
| 372 |
int page = 0; |
| 373 |
for (;;) { |
| 374 |
const unsigned first_page = find_next_page_set(page); |
| 375 |
if (first_page >= mainBuffer.pageCount) |
| 376 |
break; |
| 377 |
|
| 378 |
page = find_next_page_clear(first_page); |
| 379 |
PFLAG_CLEAR_RANGE(first_page, page); |
| 380 |
|
| 381 |
// Make the dirty pages read-only again |
| 382 |
const int32 offset = first_page << mainBuffer.pageBits; |
| 383 |
const uint32 length = (page - first_page) << mainBuffer.pageBits; |
| 384 |
vm_protect((char *)mainBuffer.memStart + offset, length, VM_PAGE_READ); |
| 385 |
|
| 386 |
// There is at least one line to update |
| 387 |
const int y1 = mainBuffer.pageInfo[first_page].top; |
| 388 |
const int y2 = mainBuffer.pageInfo[page - 1].bottom; |
| 389 |
const int height = y2 - y1 + 1; |
| 390 |
|
| 391 |
VIDEO_DRV_LOCK_PIXELS; |
| 392 |
|
| 393 |
if ((int)VIDEO_MODE_DEPTH < VIDEO_DEPTH_8BIT) { |
| 394 |
|
| 395 |
// Update the_host_buffer and copy of the_buffer |
| 396 |
const int src_bytes_per_row = VIDEO_MODE_ROW_BYTES; |
| 397 |
const int dst_bytes_per_row = VIDEO_DRV_ROW_BYTES; |
| 398 |
const int pixels_per_byte = VIDEO_MODE_X / src_bytes_per_row; |
| 399 |
int i1 = y1 * src_bytes_per_row, i2 = y1 * dst_bytes_per_row, j; |
| 400 |
for (j = y1; j <= y2; j++) { |
| 401 |
Screen_blit(the_host_buffer + i2, the_buffer + i1, VIDEO_MODE_X / pixels_per_byte); |
| 402 |
i1 += src_bytes_per_row; |
| 403 |
i2 += dst_bytes_per_row; |
| 404 |
} |
| 405 |
|
| 406 |
} else { |
| 407 |
|
| 408 |
// Update the_host_buffer and copy of the_buffer |
| 409 |
const int src_bytes_per_row = VIDEO_MODE_ROW_BYTES; |
| 410 |
const int dst_bytes_per_row = VIDEO_DRV_ROW_BYTES; |
| 411 |
const int bytes_per_pixel = src_bytes_per_row / VIDEO_MODE_X; |
| 412 |
int i1 = y1 * src_bytes_per_row, i2 = y1 * dst_bytes_per_row, j; |
| 413 |
for (j = y1; j <= y2; j++) { |
| 414 |
Screen_blit(the_host_buffer + i2, the_buffer + i1, bytes_per_pixel * VIDEO_MODE_X); |
| 415 |
i1 += src_bytes_per_row; |
| 416 |
i2 += dst_bytes_per_row; |
| 417 |
} |
| 418 |
} |
| 419 |
|
| 420 |
VIDEO_DRV_UNLOCK_PIXELS; |
| 421 |
|
| 422 |
#ifdef USE_SDL_VIDEO |
| 423 |
SDL_UpdateRect(drv->s, 0, y1, VIDEO_MODE_X, height); |
| 424 |
#else |
| 425 |
if (VIDEO_DRV_HAVE_SHM) |
| 426 |
XShmPutImage(x_display, VIDEO_DRV_WINDOW, VIDEO_DRV_GC, VIDEO_DRV_IMAGE, 0, y1, 0, y1, VIDEO_MODE_X, height, 0); |
| 427 |
else |
| 428 |
XPutImage(x_display, VIDEO_DRV_WINDOW, VIDEO_DRV_GC, VIDEO_DRV_IMAGE, 0, y1, 0, y1, VIDEO_MODE_X, height); |
| 429 |
#endif |
| 430 |
} |
| 431 |
mainBuffer.dirty = false; |
| 432 |
} |
| 433 |
|
| 434 |
|
| 435 |
/* |
| 436 |
* Update display for DGA mode and VOSF |
| 437 |
* (only in Real or Direct Addressing mode) |
| 438 |
*/ |
| 439 |
|
| 440 |
#if REAL_ADDRESSING || DIRECT_ADDRESSING |
| 441 |
static inline void update_display_dga_vosf(void) |
| 442 |
{ |
| 443 |
VIDEO_MODE_INIT; |
| 444 |
|
| 445 |
int page = 0; |
| 446 |
for (;;) { |
| 447 |
const unsigned first_page = find_next_page_set(page); |
| 448 |
if (first_page >= mainBuffer.pageCount) |
| 449 |
break; |
| 450 |
|
| 451 |
page = find_next_page_clear(first_page); |
| 452 |
PFLAG_CLEAR_RANGE(first_page, page); |
| 453 |
|
| 454 |
// Make the dirty pages read-only again |
| 455 |
const int32 offset = first_page << mainBuffer.pageBits; |
| 456 |
const uint32 length = (page - first_page) << mainBuffer.pageBits; |
| 457 |
vm_protect((char *)mainBuffer.memStart + offset, length, VM_PAGE_READ); |
| 458 |
|
| 459 |
// I am sure that y2 >= y1 and depth != 1 |
| 460 |
const int y1 = mainBuffer.pageInfo[first_page].top; |
| 461 |
const int y2 = mainBuffer.pageInfo[page - 1].bottom; |
| 462 |
|
| 463 |
const int bytes_per_row = VIDEO_MODE_ROW_BYTES; |
| 464 |
const int bytes_per_pixel = VIDEO_MODE_ROW_BYTES / VIDEO_MODE_X; |
| 465 |
int i, j; |
| 466 |
|
| 467 |
// Check for first column from left and first column |
| 468 |
// from right that have changed |
| 469 |
int x1 = VIDEO_MODE_X * bytes_per_pixel - 1; |
| 470 |
for (j = y1; j <= y2; j++) { |
| 471 |
uint8 * const p1 = &the_buffer[j * bytes_per_row]; |
| 472 |
uint8 * const p2 = &the_buffer_copy[j * bytes_per_row]; |
| 473 |
for (i = 0; i < x1; i++) { |
| 474 |
if (p1[i] != p2[i]) { |
| 475 |
x1 = i; |
| 476 |
break; |
| 477 |
} |
| 478 |
} |
| 479 |
} |
| 480 |
x1 /= bytes_per_pixel; |
| 481 |
|
| 482 |
int x2 = x1 * bytes_per_pixel; |
| 483 |
for (j = y2; j >= y1; j--) { |
| 484 |
uint8 * const p1 = &the_buffer[j * bytes_per_row]; |
| 485 |
uint8 * const p2 = &the_buffer_copy[j * bytes_per_row]; |
| 486 |
for (i = VIDEO_MODE_X * bytes_per_pixel - 1; i > x2; i--) { |
| 487 |
if (p1[i] != p2[i]) { |
| 488 |
x2 = i; |
| 489 |
break; |
| 490 |
} |
| 491 |
} |
| 492 |
} |
| 493 |
x2 /= bytes_per_pixel; |
| 494 |
|
| 495 |
// Update the_host_buffer and copy of the_buffer |
| 496 |
// There should be at least one pixel to copy |
| 497 |
VIDEO_DRV_LOCK_PIXELS; |
| 498 |
const int width = x2 - x1 + 1; |
| 499 |
i = y1 * bytes_per_row + x1 * bytes_per_pixel; |
| 500 |
for (j = y1; j <= y2; j++) { |
| 501 |
Screen_blit(the_host_buffer + i, the_buffer + i, bytes_per_pixel * width); |
| 502 |
memcpy(the_buffer_copy + i, the_buffer + i, bytes_per_pixel * width); |
| 503 |
i += bytes_per_row; |
| 504 |
} |
| 505 |
VIDEO_DRV_UNLOCK_PIXELS; |
| 506 |
} |
| 507 |
mainBuffer.dirty = false; |
| 508 |
} |
| 509 |
#endif |
| 510 |
|
| 511 |
#endif /* ENABLE_VOSF */ |
| 512 |
|
| 513 |
#endif /* VIDEO_VOSF_H */ |
