+++ /dev/null
-// common code for Pico.c and cd/Pico.c
-// (c) Copyright 2007,2008 Grazvydas "notaz" Ignotas
-
-#define CYCLES_M68K_LINE 488 // suitable for both PAL/NTSC
-#define CYCLES_M68K_VINT_LAG 68
-#define CYCLES_M68K_ASD 148
-#define CYCLES_S68K_LINE 795
-#define CYCLES_S68K_ASD 241
-
-// pad delay (for 6 button pads)
-#define PAD_DELAY \
- if (PicoOpt&POPT_6BTN_PAD) { \
- if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0; \
- if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0; \
- }
-
-// CPUS_RUN
-#ifndef PICO_CD
-#define CPUS_RUN(m68k_cycles,s68k_cycles) \
- SekRunM68k(m68k_cycles);
-#else
-#define CPUS_RUN(m68k_cycles,s68k_cycles) \
-{ \
- if ((PicoOpt&POPT_EN_MCD_PSYNC) && (Pico_mcd->m.busreq&3) == 1) { \
- SekRunPS(m68k_cycles, s68k_cycles); /* "better/perfect sync" */ \
- } else { \
- SekRunM68k(m68k_cycles); \
- if ((Pico_mcd->m.busreq&3) == 1) /* no busreq/no reset */ \
- SekRunS68k(s68k_cycles); \
- } \
-}
-#endif
-
-// Accurate but slower frame which does hints
-static int PicoFrameHints(void)
-{
- struct PicoVideo *pv=&Pico.video;
- int lines, y, lines_vis = 224, line_sample, skip, vcnt_wrap;
- int hint; // Hint counter
-
- pv->v_counter = Pico.m.scanline = 0;
-
- if ((PicoOpt&POPT_ALT_RENDERER) && !PicoSkipFrame && (pv->reg[1]&0x40)) { // fast rend., display enabled
- // draw a frame just after vblank in alternative render mode
- // yes, this will cause 1 frame lag, but this is inaccurate mode anyway.
- PicoFrameFull();
-#ifdef DRAW_FINISH_FUNC
- DRAW_FINISH_FUNC();
-#endif
- skip = 1;
- }
- else skip=PicoSkipFrame;
-
- if (Pico.m.pal) {
- line_sample = 68;
- if (pv->reg[1]&8) lines_vis = 240;
- } else {
- line_sample = 93;
- }
-
- SekCyclesReset();
- z80_resetCycles();
-#ifdef PICO_CD
- SekCyclesResetS68k();
-#endif
- PsndDacLine = 0;
-
- pv->status&=~0x88; // clear V-Int, come out of vblank
-
- hint=pv->reg[10]; // Load H-Int counter
- //dprintf("-hint: %i", hint);
-
- // This is to make active scan longer (needed for Double Dragon 2, mainly)
- CPUS_RUN(CYCLES_M68K_ASD, CYCLES_S68K_ASD);
-
- for (y = 0; y < lines_vis; y++)
- {
- pv->v_counter = Pico.m.scanline = y;
- if ((pv->reg[12]&6) == 6) { // interlace mode 2
- pv->v_counter <<= 1;
- pv->v_counter |= pv->v_counter >> 8;
- pv->v_counter &= 0xff;
- }
-
- // VDP FIFO
- pv->lwrite_cnt -= 12;
- if (pv->lwrite_cnt <= 0) {
- pv->lwrite_cnt=0;
- Pico.video.status|=0x200;
- }
-
- PAD_DELAY
-#ifdef PICO_CD
- check_cd_dma();
-#endif
-
- // H-Interrupts:
- if (--hint < 0) // y <= lines_vis: Comix Zone, Golden Axe
- {
- hint=pv->reg[10]; // Reload H-Int counter
- pv->pending_ints|=0x10;
- if (pv->reg[0]&0x10) {
- elprintf(EL_INTS, "hint: @ %06x [%i]", SekPc, SekCycleCnt);
- SekInterrupt(4);
- }
- }
-
- // decide if we draw this line
- if (!skip && (PicoOpt & POPT_ALT_RENDERER))
- {
- // find the right moment for frame renderer, when display is no longer blanked
- if ((pv->reg[1]&0x40) || y > 100) {
- PicoFrameFull();
-#ifdef DRAW_FINISH_FUNC
- DRAW_FINISH_FUNC();
-#endif
- skip = 1;
- }
- }
-
-#ifndef PICO_CD
- // get samples from sound chips
- if (y == 32 && PsndOut)
- emustatus &= ~1;
- else if ((y == 224 || y == line_sample) && PsndOut)
- {
- if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80))
- PicoSyncZ80(SekCycleCnt);
- if (ym2612.dacen && PsndDacLine <= y)
- PsndDoDAC(y);
- getSamples(y);
- }
-#endif
-
- // Run scanline:
- if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA());
- CPUS_RUN(CYCLES_M68K_LINE, CYCLES_S68K_LINE);
-
-#ifdef PICO_CD
- update_chips();
-#else
- if (PicoLineHook) PicoLineHook();
-#endif
- }
-
- if (!skip)
- {
- if (DrawScanline < y)
- PicoDrawSync(y - 1, 0);
-#ifdef DRAW_FINISH_FUNC
- DRAW_FINISH_FUNC();
-#endif
- }
-
- // V-int line (224 or 240)
- Pico.m.scanline = y;
- pv->v_counter = 0xe0; // bad for 240 mode
- if ((pv->reg[12]&6) == 6) pv->v_counter = 0xc1;
-
- // VDP FIFO
- pv->lwrite_cnt=0;
- Pico.video.status|=0x200;
-
- memcpy(PicoPadInt, PicoPad, sizeof(PicoPadInt));
- PAD_DELAY
-#ifdef PICO_CD
- check_cd_dma();
-#endif
-
- // Last H-Int:
- if (--hint < 0)
- {
- hint=pv->reg[10]; // Reload H-Int counter
- pv->pending_ints|=0x10;
- //printf("rhint: %i @ %06x [%i|%i]\n", hint, SekPc, y, SekCycleCnt);
- if (pv->reg[0]&0x10) SekInterrupt(4);
- }
-
- pv->status|=0x08; // go into vblank
- pv->pending_ints|=0x20;
-
- // the following SekRun is there for several reasons:
- // there must be a delay after vblank bit is set and irq is asserted (Mazin Saga)
- // also delay between F bit (bit 7) is set in SR and IRQ happens (Ex-Mutants)
- // also delay between last H-int and V-int (Golden Axe 3)
- SekRunM68k(CYCLES_M68K_VINT_LAG);
-
- if (pv->reg[1]&0x20) {
- elprintf(EL_INTS, "vint: @ %06x [%i]", SekPc, SekCycleCnt);
- SekInterrupt(6);
- }
- if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80)) {
- PicoSyncZ80(SekCycleCnt);
- elprintf(EL_INTS, "zint");
- z80_int();
- }
-
- // get samples from sound chips
-#ifndef PICO_CD
- if (y == 224)
-#endif
- if (PsndOut)
- {
- if (ym2612.dacen && PsndDacLine <= y)
- PsndDoDAC(y);
- getSamples(y);
- }
-
- // Run scanline:
- if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA());
- CPUS_RUN(CYCLES_M68K_LINE - CYCLES_M68K_VINT_LAG - CYCLES_M68K_ASD,
- CYCLES_S68K_LINE - CYCLES_S68K_ASD);
-
-#ifdef PICO_CD
- update_chips();
-#else
- if (PicoLineHook) PicoLineHook();
-#endif
-
- // PAL line count might actually be 313 according to Steve Snake, but that would complicate things.
- lines = Pico.m.pal ? 312 : 262;
- vcnt_wrap = Pico.m.pal ? 0x103 : 0xEB; // based on Gens
-
- for (y++; y < lines; y++)
- {
- pv->v_counter = Pico.m.scanline = y;
- if (y >= vcnt_wrap)
- pv->v_counter -= Pico.m.pal ? 56 : 6;
- if ((pv->reg[12]&6) == 6)
- pv->v_counter = (pv->v_counter << 1) | 1;
- pv->v_counter &= 0xff;
-
- PAD_DELAY
-#ifdef PICO_CD
- check_cd_dma();
-#endif
-
- // Run scanline:
- if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA());
- CPUS_RUN(CYCLES_M68K_LINE, CYCLES_S68K_LINE);
-
-#ifdef PICO_CD
- update_chips();
-#else
- if (PicoLineHook) PicoLineHook();
-#endif
- }
-
- // sync z80
- if (Pico.m.z80Run && !Pico.m.z80_reset && (PicoOpt&POPT_EN_Z80))
- PicoSyncZ80(Pico.m.pal ? 151809 : 127671); // cycles adjusted for converter
- if (PsndOut && ym2612.dacen && PsndDacLine <= lines-1)
- PsndDoDAC(lines-1);
-
- timers_cycle();
-
- return 0;
-}
-
-#undef PAD_DELAY
-#undef CPUS_RUN
-
notaz.gp2x.de / picodrive.git / blobdiff