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pandora: fix readme and pxml version
[picodrive.git] / platform / gizmondo / emu.c
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1#include <windows.h>
2#include <string.h>
3
4#include <sys/stat.h> // mkdir
5#include <sys/types.h>
6
7#include "kgsdk/Framework.h"
8#include "kgsdk/Framework2D.h"
9#include "kgsdk/FrameworkAudio.h"
10#include "../common/emu.h"
11#include "../common/arm_utils.h"
12#include "../common/config.h"
13#include "../libpicofe/lprintf.h"
14#include "emu.h"
15#include "menu.h"
16#include "giz.h"
17#include "asm_utils.h"
18
19#include <pico/pico_int.h>
20
21#ifdef BENCHMARK
22#define OSD_FPS_X 220
23#else
24#define OSD_FPS_X 260
25#endif
26
27// main 300K gfx-related buffer. Used by menu and renderers.
28unsigned char gfx_buffer[321*240*2*2];
29
30static short *snd_cbuff = NULL;
31static int snd_cbuf_samples = 0, snd_all_samples = 0;
32
33
34static void blit(const char *fps, const char *notice);
35static void clearArea(int full);
36
37int plat_get_root_dir(char *dst, int len)
38{
39 if (len > 0) *dst = 0;
40
41 return 0;
42}
43
44static void emu_msg_cb(const char *msg)
45{
46 if (giz_screen != NULL) fb_unlock();
47 giz_screen = fb_lock(1);
48
49 memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
50 emu_text_out16(4, 232, msg);
51 noticeMsgTime = GetTickCount() - 2000;
52
53 /* assumption: emu_msg_cb gets called only when something slow is about to happen */
54 reset_timing = 1;
55
56 fb_unlock();
57 giz_screen = fb_lock((currentConfig.EmuOpt&0x8000) ? 0 : 1);
58}
59
60void emu_stateCb(const char *str)
61{
62 if (giz_screen != NULL) fb_unlock();
63 giz_screen = fb_lock(1);
64
65 clearArea(0);
66 blit("", str);
67
68 fb_unlock();
69 giz_screen = NULL;
70
71 Sleep(0); /* yield the CPU, the system may need it */
72}
73
74void pemu_prep_defconfig(void)
75{
76 defaultConfig.s_PsndRate = 22050;
77 defaultConfig.s_PicoCDBuffers = 0;
78 defaultConfig.KeyBinds[ 2] = 1<<0; // SACB RLDU
79 defaultConfig.KeyBinds[ 3] = 1<<1;
80 defaultConfig.KeyBinds[ 0] = 1<<2;
81 defaultConfig.KeyBinds[ 1] = 1<<3;
82 defaultConfig.KeyBinds[ 5] = 1<<4;
83 defaultConfig.KeyBinds[ 6] = 1<<5;
84 defaultConfig.KeyBinds[ 7] = 1<<6;
85 defaultConfig.KeyBinds[ 4] = 1<<7;
86 defaultConfig.KeyBinds[13] = 1<<26; // switch rend
87 defaultConfig.KeyBinds[ 8] = 1<<27; // save state
88 defaultConfig.KeyBinds[ 9] = 1<<28; // load state
89 defaultConfig.KeyBinds[12] = 1<<29; // vol up
90 defaultConfig.KeyBinds[11] = 1<<30; // vol down
91 defaultConfig.scaling = 0;
92}
93
94
95static int EmuScanBegin16(unsigned int num)
96{
97 Pico.est.DrawLineDest = (unsigned short *) giz_screen + 321 * num;
98
99 if ((currentConfig.EmuOpt&0x4000) && (num&1) == 0) // (Pico.m.frame_count&1))
100 return 1; // skip next line
101
102 return 0;
103}
104
105static int EmuScanBegin8(unsigned int num)
106{
107 // draw like the fast renderer
108 Pico.est.HighCol = gfx_buffer + 328 * num;
109
110 return 0;
111}
112
113static void osd_text(int x, int y, const char *text)
114{
115 int len = strlen(text) * 8 / 2;
116 int *p, h;
117 for (h = 0; h < 8; h++) {
118 p = (int *) ((unsigned short *) giz_screen+x+321*(y+h));
119 p = (int *) ((int)p & ~3); // align
120 memset32(p, 0, len);
121 }
122 emu_text_out16(x, y, text);
123}
124
125static void cd_leds(void)
126{
127 static int old_reg = 0;
128 unsigned int col_g, col_r, *p;
129
130 if (!((Pico_mcd->s68k_regs[0] ^ old_reg) & 3)) return; // no change
131 old_reg = Pico_mcd->s68k_regs[0];
132
133 p = (unsigned int *)((short *)giz_screen + 321*2+4+2);
134 col_g = (old_reg & 2) ? 0x06000600 : 0;
135 col_r = (old_reg & 1) ? 0xc000c000 : 0;
136 *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r; p += 321/2 - 12/2 + 1;
137 *p++ = col_g; p+=3; *p++ = col_r; p += 321/2 - 10/2;
138 *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r;
139}
140
141
142static short localPal[0x100];
143
144static void blit(const char *fps, const char *notice)
145{
146 int emu_opt = currentConfig.EmuOpt;
147
148 if (PicoIn.opt&0x10)
149 {
150 int lines_flags = 224;
151 // 8bit fast renderer
152 if (Pico.m.dirtyPal) {
153 Pico.m.dirtyPal = 0;
154 vidConvCpyRGB565(localPal, Pico.cram, 0x40);
155 }
156 // a hack for VR
157 if (PicoIn.AHW & PAHW_SVP)
158 memset((int *)(Pico.est.Draw2FB+328*8+328*223), 0xe0e0e0e0, 328*4);
159 if (!(Pico.video.reg[12]&1)) lines_flags|=0x10000;
160 if (currentConfig.EmuOpt&0x4000)
161 lines_flags|=0x40000; // (Pico.m.frame_count&1)?0x20000:0x40000;
162 vidCpy8to16((unsigned short *)giz_screen+321*8, Pico.est.Draw2FB+328*8, localPal, lines_flags);
163 }
164 else if (!(emu_opt&0x80))
165 {
166 int lines_flags;
167 // 8bit accurate renderer
168 if (Pico.m.dirtyPal) {
169 if (Pico.m.dirtyPal == 2)
170 Pico.m.dirtyPal = 0;
171 /* no support
172 switch (Pico.est.SonicPalCount) {
173 case 3: vidConvCpyRGB565(localPal+0xc0, Pico.est.SonicPal+0xc0, 0x40);
174 case 2: vidConvCpyRGB565(localPal+0x80, Pico.est.SonicPal+0x80, 0x40);
175 case 1: vidConvCpyRGB565(localPal+0x40, Pico.est.SonicPal+0x40, 0x40);
176 default://vidConvCpyRGB565(localPal, Pico.est.SonicPal, 0x40);
177 } */
178 vidConvCpyRGB565(localPal, Pico.est.SonicPal, 0x40);
179 if (Pico.video.reg[0xC]&8) { // shadow/hilight mode
180 //vidConvCpyRGB32sh(localPal+0x40, Pico.est.SonicPal, 0x40);
181 //vidConvCpyRGB32hi(localPal+0x80, Pico.est.SonicPal, 0x40); // TODO?
182 memcpy((void *)(localPal+0xc0), (void *)(localPal+0x40), 0x40*2);
183 localPal[0xc0] = 0x0600;
184 localPal[0xd0] = 0xc000;
185 localPal[0xe0] = 0x0000; // reserved pixels for OSD
186 localPal[0xf0] = 0xffff;
187 }
188 }
189 lines_flags = (Pico.video.reg[1]&8) ? 240 : 224;
190 if (!(Pico.video.reg[12]&1)) lines_flags|=0x10000;
191 if (currentConfig.EmuOpt&0x4000)
192 lines_flags|=0x40000; // (Pico.m.frame_count&1)?0x20000:0x40000;
193 vidCpy8to16((unsigned short *)giz_screen+321*8, Pico.est.Draw2FB+328*8, localPal, lines_flags);
194 }
195
196 if (notice || (emu_opt & 2)) {
197 int h = 232;
198 if (notice) osd_text(4, h, notice);
199 if (emu_opt & 2) osd_text(OSD_FPS_X, h, fps);
200 }
201
202 if ((emu_opt & 0x400) && (PicoIn.AHW & PAHW_MCD))
203 cd_leds();
204}
205
206// clears whole screen or just the notice area (in all buffers)
207static void clearArea(int full)
208{
209 if (giz_screen == NULL)
210 giz_screen = fb_lock(1);
211 if (full) memset32(giz_screen, 0, 320*240*2/4);
212 else memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
213
214 if (currentConfig.EmuOpt&0x8000) {
215 fb_unlock();
216 giz_screen = fb_lock(0);
217 if (full) memset32(giz_screen, 0, 320*240*2/4);
218 else memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
219 }
220}
221
222static void vidResetMode(void)
223{
224 giz_screen = fb_lock(1);
225
226 if (PicoIn.opt&0x10) {
227 } else if (currentConfig.EmuOpt&0x80) {
228 PicoDrawSetOutFormat(PDF_RGB555, 0);
229 PicoDrawSetCallbacks(EmuScanBegin16, NULL);
230 } else {
231 PicoDrawSetOutFormat(PDF_NONE, 0);
232 PicoDrawSetCallbacks(EmuScanBegin8, NULL);
233 }
234 if ((PicoIn.opt&0x10) || !(currentConfig.EmuOpt&0x80)) {
235 // setup pal for 8-bit modes
236 localPal[0xc0] = 0x0600;
237 localPal[0xd0] = 0xc000;
238 localPal[0xe0] = 0x0000; // reserved pixels for OSD
239 localPal[0xf0] = 0xffff;
240 }
241 Pico.m.dirtyPal = 1;
242
243 memset32(giz_screen, 0, 321*240*2/4);
244 if (currentConfig.EmuOpt&0x8000) {
245 fb_unlock();
246 giz_screen = fb_lock(0);
247 memset32(giz_screen, 0, 321*240*2/4);
248 }
249 fb_unlock();
250 giz_screen = NULL;
251}
252
253/*
254#include <stdarg.h>
255static void stdbg(const char *fmt, ...)
256{
257 static int cnt = 0;
258 va_list vl;
259
260 sprintf(noticeMsg, "%x ", cnt++);
261 va_start(vl, fmt);
262 vsnprintf(noticeMsg+strlen(noticeMsg), sizeof(noticeMsg)-strlen(noticeMsg), fmt, vl);
263 va_end(vl);
264
265 noticeMsgTime = GetTickCount();
266}
267*/
268
269static void updateSound(int len)
270{
271 snd_all_samples += len / 2;
272 PicoIn.sndOut += len / 2;
273 if (PicoIn.sndOut - snd_cbuff >= snd_cbuf_samples)
274 {
275 //if (PicoIn.sndOut - snd_cbuff != snd_cbuf_samples)
276 // stdbg("snd diff is %i, not %i", PicoIn.sndOut - snd_cbuff, snd_cbuf_samples);
277 PicoIn.sndOut = snd_cbuff;
278 }
279}
280
281
282static void SkipFrame(void)
283{
284 PicoIn.skipFrame=1;
285 PicoFrame();
286 PicoIn.skipFrame=0;
287}
288
289/* forced frame to front buffer */
290void pemu_forced_frame(int no_scale, int do_emu)
291{
292 int po_old = PicoIn.opt;
293 int eo_old = currentConfig.EmuOpt;
294
295 PicoIn.opt &= ~0x10;
296 PicoIn.opt |= POPT_ACC_SPRITES;
297 if (!no_scale && currentConfig.scaling)
298 PicoIn.opt |= POPT_EN_SOFTSCALE;
299 currentConfig.EmuOpt |= 0x80;
300
301 if (giz_screen == NULL)
302 giz_screen = fb_lock(1);
303
304 PicoDrawSetOutFormat(PDF_RGB555, 0);
305 PicoDrawSetCallbacks(EmuScanBegin16, NULL);
306 Pico.m.dirtyPal = 1;
307 PicoFrameDrawOnly();
308
309 fb_unlock();
310 giz_screen = NULL;
311
312 PicoIn.opt = po_old;
313 currentConfig.EmuOpt = eo_old;
314}
315
316
317static void RunEvents(unsigned int which)
318{
319 if (which & 0x1800) // save or load (but not both)
320 {
321 int do_it = 1;
322
323 if (PicoIn.sndOut != NULL)
324 FrameworkAudio_SetPause(1);
325 if (giz_screen == NULL)
326 giz_screen = fb_lock(1);
327 if ( emu_check_save_file(state_slot) &&
328 (( (which & 0x1000) && (currentConfig.EmuOpt & 0x800)) || // load
329 (!(which & 0x1000) && (currentConfig.EmuOpt & 0x200))) ) // save
330 {
331 int keys;
332 blit("", (which & 0x1000) ? "LOAD STATE? (PLAY=yes, STOP=no)" : "OVERWRITE SAVE? (PLAY=yes, STOP=no)");
333 while( !((keys = Framework_PollGetButtons()) & (PBTN_PLAY|PBTN_STOP)) )
334 Sleep(50);
335 if (keys & PBTN_STOP) do_it = 0;
336 while( ((keys = Framework_PollGetButtons()) & (PBTN_PLAY|PBTN_STOP)) ) // wait for release
337 Sleep(50);
338 clearArea(0);
339 }
340
341 if (do_it)
342 {
343 osd_text(4, 232, (which & 0x1000) ? "LOADING GAME" : "SAVING GAME");
344 PicoStateProgressCB = emu_stateCb;
345 emu_save_load_game((which & 0x1000) >> 12, 0);
346 PicoStateProgressCB = NULL;
347 Sleep(0);
348 }
349
350 if (PicoIn.sndOut != NULL)
351 FrameworkAudio_SetPause(0);
352 reset_timing = 1;
353 }
354 if (which & 0x0400) // switch renderer
355 {
356 if (PicoIn.opt&0x10) { PicoIn.opt&=~0x10; currentConfig.EmuOpt |= 0x80; }
357 else { PicoIn.opt|= 0x10; currentConfig.EmuOpt &= ~0x80; }
358
359 vidResetMode();
360
361 if (PicoIn.opt&0x10) {
362 strcpy(noticeMsg, " 8bit fast renderer");
363 } else if (currentConfig.EmuOpt&0x80) {
364 strcpy(noticeMsg, "16bit accurate renderer");
365 } else {
366 strcpy(noticeMsg, " 8bit accurate renderer");
367 }
368
369 noticeMsgTime = GetTickCount();
370 }
371 if (which & 0x0300)
372 {
373 if(which&0x0200) {
374 state_slot -= 1;
375 if(state_slot < 0) state_slot = 9;
376 } else {
377 state_slot += 1;
378 if(state_slot > 9) state_slot = 0;
379 }
380 sprintf(noticeMsg, "SAVE SLOT %i [%s]", state_slot, emu_check_save_file(state_slot) ? "USED" : "FREE");
381 noticeMsgTime = GetTickCount();
382 }
383}
384
385static void updateKeys(void)
386{
387 unsigned int keys, allActions[2] = { 0, 0 }, events;
388 static unsigned int prevEvents = 0;
389 int i;
390
391 /* FIXME: port to input fw, merge with emu.c:emu_update_input() */
392 keys = Framework_PollGetButtons();
393 if (keys & PBTN_HOME)
394 engineState = PGS_Menu;
395
396 keys &= CONFIGURABLE_KEYS;
397
398 PicoIn.pad[0] = allActions[0] & 0xfff;
399 PicoIn.pad[1] = allActions[1] & 0xfff;
400
401 if (allActions[0] & 0x7000) emu_DoTurbo(&PicoIn.pad[0], allActions[0]);
402 if (allActions[1] & 0x7000) emu_DoTurbo(&PicoIn.pad[1], allActions[1]);
403
404 events = (allActions[0] | allActions[1]) >> 16;
405
406 // volume is treated in special way and triggered every frame
407 if ((events & 0x6000) && PicoIn.sndOut != NULL)
408 {
409 int vol = currentConfig.volume;
410 if (events & 0x2000) {
411 if (vol < 100) vol++;
412 } else {
413 if (vol > 0) vol--;
414 }
415 FrameworkAudio_SetVolume(vol, vol);
416 sprintf(noticeMsg, "VOL: %02i ", vol);
417 noticeMsgTime = GetTickCount();
418 currentConfig.volume = vol;
419 }
420
421 events &= ~prevEvents;
422 if (events) RunEvents(events);
423 if (movie_data) emu_updateMovie();
424
425 prevEvents = (allActions[0] | allActions[1]) >> 16;
426}
427
428void plat_debug_cat(char *str)
429{
430}
431
432static void simpleWait(DWORD until)
433{
434 DWORD tval;
435 int diff;
436
437 tval = GetTickCount();
438 diff = (int)until - (int)tval;
439 if (diff >= 2)
440 Sleep(diff - 1);
441
442 while ((tval = GetTickCount()) < until && until - tval < 512) // some simple overflow detection
443 spend_cycles(1024*2);
444}
445
446void pemu_loop(void)
447{
448 static int PsndRate_old = 0, PicoOpt_old = 0, pal_old = 0;
449 char fpsbuff[24]; // fps count c string
450 DWORD tval, tval_prev = 0, tval_thissec = 0; // timing
451 int frames_done = 0, frames_shown = 0, oldmodes = 0, sec_ms = 1000;
452 int target_fps, target_frametime, lim_time, tval_diff, i;
453 char *notice = NULL;
454
455 lprintf("entered emu_Loop()\n");
456
457 fpsbuff[0] = 0;
458
459 // make sure we are in correct mode
460 vidResetMode();
461 if (currentConfig.scaling) PicoIn.opt|=0x4000;
462 else PicoIn.opt&=~0x4000;
463 Pico.m.dirtyPal = 1;
464 oldmodes = ((Pico.video.reg[12]&1)<<2) ^ 0xc;
465
466 // pal/ntsc might have changed, reset related stuff
467 target_fps = Pico.m.pal ? 50 : 60;
468 target_frametime = Pico.m.pal ? (1000<<8)/50 : (1000<<8)/60+1;
469 reset_timing = 1;
470
471 // prepare CD buffer
472 if (PicoIn.AHW & PAHW_MCD) PicoCDBufferInit();
473
474 // prepare sound stuff
475 PicoIn.sndOut = NULL;
476 if (currentConfig.EmuOpt & 4)
477 {
478 int ret, snd_excess_add, stereo;
479 if (PicoIn.sndRate != PsndRate_old || (PicoIn.opt&0x0b) != (PicoOpt_old&0x0b) || Pico.m.pal != pal_old) {
480 PsndRerate(Pico.m.frame_count ? 1 : 0);
481 }
482 stereo=(PicoIn.opt&8)>>3;
483 snd_excess_add = ((PicoIn.sndRate - Pico.snd.len*target_fps)<<16) / target_fps;
484 snd_cbuf_samples = (PicoIn.sndRate<<stereo) * 16 / target_fps;
485 lprintf("starting audio: %i len: %i (ex: %04x) stereo: %i, pal: %i\n",
486 PicoIn.sndRate, Pico.snd.len, snd_excess_add, stereo, Pico.m.pal);
487 ret = FrameworkAudio_Init(PicoIn.sndRate, snd_cbuf_samples, stereo);
488 if (ret != 0) {
489 lprintf("FrameworkAudio_Init() failed: %i\n", ret);
490 sprintf(noticeMsg, "sound init failed (%i), snd disabled", ret);
491 noticeMsgTime = GetTickCount();
492 currentConfig.EmuOpt &= ~4;
493 } else {
494 FrameworkAudio_SetVolume(currentConfig.volume, currentConfig.volume);
495 PicoIn.writeSound = updateSound;
496 snd_cbuff = FrameworkAudio_56448Buffer();
497 PicoIn.sndOut = snd_cbuff + snd_cbuf_samples / 2; // start writing at the middle
498 snd_all_samples = 0;
499 PsndRate_old = PicoIn.sndRate;
500 PicoOpt_old = PicoIn.opt;
501 pal_old = Pico.m.pal;
502 }
503 }
504
505 // loop?
506 while (engineState == PGS_Running)
507 {
508 int modes;
509
510 tval = GetTickCount();
511 if (reset_timing || tval < tval_prev) {
512 //stdbg("timing reset");
513 reset_timing = 0;
514 tval_thissec = tval;
515 frames_shown = frames_done = 0;
516 }
517
518 // show notice message?
519 if (noticeMsgTime) {
520 static int noticeMsgSum;
521 if (tval - noticeMsgTime > 2000) { // > 2.0 sec
522 noticeMsgTime = 0;
523 clearArea(0);
524 notice = 0;
525 } else {
526 int sum = noticeMsg[0]+noticeMsg[1]+noticeMsg[2];
527 if (sum != noticeMsgSum) { clearArea(0); noticeMsgSum = sum; }
528 notice = noticeMsg;
529 }
530 }
531
532 // check for mode changes
533 modes = ((Pico.video.reg[12]&1)<<2)|(Pico.video.reg[1]&8);
534 if (modes != oldmodes) {
535 oldmodes = modes;
536 clearArea(1);
537 }
538
539 // second passed?
540 if (tval - tval_thissec >= sec_ms)
541 {
542#ifdef BENCHMARK
543 static int bench = 0, bench_fps = 0, bench_fps_s = 0, bfp = 0, bf[4];
544 if(++bench == 10) {
545 bench = 0;
546 bench_fps_s = bench_fps;
547 bf[bfp++ & 3] = bench_fps;
548 bench_fps = 0;
549 }
550 bench_fps += frames_shown;
551 sprintf(fpsbuff, "%02i/%02i/%02i", frames_shown, bench_fps_s, (bf[0]+bf[1]+bf[2]+bf[3])>>2);
552#else
553 if(currentConfig.EmuOpt & 2)
554 sprintf(fpsbuff, "%02i/%02i", frames_shown, frames_done);
555#endif
556 //tval_thissec += 1000;
557 tval_thissec += sec_ms;
558
559 if (PicoIn.sndOut != NULL)
560 {
561 /* some code which tries to sync things to audio clock, the dirty way */
562 static int audio_skew_prev = 0;
563 int audio_skew, adj, co = 9, shift = 7;
564 audio_skew = snd_all_samples*2 - FrameworkAudio_BufferPos();
565 if (PicoIn.sndRate == 22050) co = 10;
566 if (PicoIn.sndRate > 22050) co = 11;
567 if (PicoIn.opt&8) shift++;
568 if (audio_skew < 0) {
569 adj = -((-audio_skew) >> shift);
570 if (audio_skew > -(6<<co)) adj>>=1;
571 if (audio_skew > -(4<<co)) adj>>=1;
572 if (audio_skew > -(2<<co)) adj>>=1;
573 if (audio_skew > audio_skew_prev) adj>>=2; // going up already
574 } else {
575 adj = audio_skew >> shift;
576 if (audio_skew < (6<<co)) adj>>=1;
577 if (audio_skew < (4<<co)) adj>>=1;
578 if (audio_skew < (2<<co)) adj>>=1;
579 if (audio_skew < audio_skew_prev) adj>>=2;
580 }
581 audio_skew_prev = audio_skew;
582 target_frametime += adj;
583 sec_ms = (target_frametime * target_fps) >> 8;
584 //stdbg("%i %i %i", audio_skew, adj, sec_ms);
585 frames_done = frames_shown = 0;
586 }
587 else if (currentConfig.Frameskip < 0) {
588 frames_done -= target_fps; if (frames_done < 0) frames_done = 0;
589 frames_shown -= target_fps; if (frames_shown < 0) frames_shown = 0;
590 if (frames_shown > frames_done) frames_shown = frames_done;
591 } else {
592 frames_done = frames_shown = 0;
593 }
594 }
595#ifdef PFRAMES
596 sprintf(fpsbuff, "%i", Pico.m.frame_count);
597#endif
598
599 tval_prev = tval;
600 lim_time = (frames_done+1) * target_frametime;
601 if (currentConfig.Frameskip >= 0) // frameskip enabled
602 {
603 for (i = 0; i < currentConfig.Frameskip; i++) {
604 updateKeys();
605 SkipFrame(); frames_done++;
606 if (PicoIn.sndOut) { // do framelimitting if sound is enabled
607 int tval_diff;
608 tval = GetTickCount();
609 tval_diff = (int)(tval - tval_thissec) << 8;
610 if (tval_diff < lim_time) // we are too fast
611 simpleWait(tval + ((lim_time - tval_diff)>>8));
612 }
613 lim_time += target_frametime;
614 }
615 }
616 else // auto frameskip
617 {
618 int tval_diff;
619 tval = GetTickCount();
620 tval_diff = (int)(tval - tval_thissec) << 8;
621 if (tval_diff > lim_time)
622 {
623 // no time left for this frame - skip
624 if (tval_diff - lim_time >= (300<<8)) {
625 /* something caused a slowdown for us (disk access? cache flush?)
626 * try to recover by resetting timing... */
627 reset_timing = 1;
628 continue;
629 }
630 updateKeys();
631 SkipFrame(); frames_done++;
632 continue;
633 }
634 }
635
636 updateKeys();
637
638 if (currentConfig.EmuOpt&0x80)
639 /* be sure correct framebuffer is locked */
640 giz_screen = fb_lock((currentConfig.EmuOpt&0x8000) ? 0 : 1);
641
642 PicoFrame();
643
644 if (giz_screen == NULL)
645 giz_screen = fb_lock((currentConfig.EmuOpt&0x8000) ? 0 : 1);
646
647 blit(fpsbuff, notice);
648
649 if (giz_screen != NULL) {
650 fb_unlock();
651 giz_screen = NULL;
652 }
653
654 if (currentConfig.EmuOpt&0x2000)
655 Framework2D_WaitVSync();
656
657 if (currentConfig.EmuOpt&0x8000)
658 fb_flip();
659
660 // check time
661 tval = GetTickCount();
662 tval_diff = (int)(tval - tval_thissec) << 8;
663
664 if (currentConfig.Frameskip < 0 && tval_diff - lim_time >= (300<<8)) // slowdown detection
665 reset_timing = 1;
666 else if (PicoIn.sndOut != NULL || currentConfig.Frameskip < 0)
667 {
668 // sleep if we are still too fast
669 if (tval_diff < lim_time)
670 {
671 // we are too fast
672 simpleWait(tval + ((lim_time - tval_diff) >> 8));
673 }
674 }
675
676 frames_done++; frames_shown++;
677 }
678
679
680 if (PicoIn.AHW & PAHW_MCD) PicoCDBufferFree();
681
682 if (PicoIn.sndOut != NULL) {
683 PicoIn.sndOut = snd_cbuff = NULL;
684 FrameworkAudio_Close();
685 }
686
687 // save SRAM
688 if ((currentConfig.EmuOpt & 1) && SRam.changed) {
689 emu_stateCb("Writing SRAM/BRAM..");
690 emu_save_load_game(0, 1);
691 SRam.changed = 0;
692 }
693}
694
fast MegaDrive/MegaCD/32X emulator