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- #define CYCLES_M68K_LINE 488 // suitable for both PAL/NTSC
- #define CYCLES_M68K_VINT_LAG 68
- #define CYCLES_M68K_ASD 148
- #define CYCLES_Z80_LINE 228
- #define CYCLES_Z80_ASD 69
- #define CYCLES_S68K_LINE 795
- #define CYCLES_S68K_ASD 241
- // pad delay (for 6 button pads)
- #define PAD_DELAY \
- if (PicoOpt&0x20) { \
- if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0; \
- if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0; \
- }
- #define Z80_RUN(z80_cycles) \
- { \
- if ((PicoOpt&4) && Pico.m.z80Run) \
- { \
- int cnt; \
- if (Pico.m.z80Run & 2) z80CycleAim += z80_cycles; \
- else { \
- cnt = SekCyclesDone() - z80startCycle; \
- cnt = (cnt>>1)-(cnt>>5); \
- if (cnt < 0 || cnt > (z80_cycles)) cnt = z80_cycles; \
- Pico.m.z80Run |= 2; \
- z80CycleAim+=cnt; \
- } \
- cnt=z80CycleAim-total_z80; \
- if (cnt > 0) total_z80+=z80_run(cnt); \
- } \
- }
- // CPUS_RUN
- #ifndef PICO_CD
- #define CPUS_RUN(m68k_cycles,z80_cycles,s68k_cycles) \
- SekRunM68k(m68k_cycles); \
- Z80_RUN(z80_cycles);
- #else
- #define CPUS_RUN(m68k_cycles,z80_cycles,s68k_cycles) \
- { \
- if ((PicoOpt & 0x2000) && (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); \
- } \
- Z80_RUN(z80_cycles); \
- }
- #endif
- // Accurate but slower frame which does hints
- static int PicoFrameHints(void)
- {
- struct PicoVideo *pv=&Pico.video;
- int lines,y,lines_vis = 224,total_z80 = 0,z80CycleAim = 0,line_sample;
- int skip=PicoSkipFrame || (PicoOpt&0x10);
- int hint; // Hint counter
- if (Pico.m.pal) {
- //cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488)
- //cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228
- line_sample = 68;
- if(pv->reg[1]&8) lines_vis = 240;
- } else {
- //cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488
- //cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228
- line_sample = 93;
- }
- SekCyclesReset();
- #ifdef PICO_CD
- SekCyclesResetS68k();
- #endif
- 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)
- // also trying to adjust for z80 overclock here (due to int line cycle counts)
- z80CycleAim = Pico.m.pal ? -40 : 7;
- CPUS_RUN(CYCLES_M68K_ASD, 0, CYCLES_S68K_ASD);
- for (y=0;y<lines_vis;y++)
- {
- Pico.m.scanline=(short)y;
- // 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 CAN_HANDLE_240_LINES
- if(!skip && ((!(pv->reg[1]&8) && y<224) || (pv->reg[1]&8)) )
- #else
- if(!skip && y<224)
- #endif
- PicoLine(y);
- if(PicoOpt&1)
- sound_timers_and_dac(y);
- #ifndef PICO_CD
- // get samples from sound chips
- if(y == 32 && PsndOut)
- emustatus &= ~1;
- else if((y == 224 || y == line_sample) && PsndOut)
- getSamples(y);
- #endif
- // Run scanline:
- if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA());
- CPUS_RUN(CYCLES_M68K_LINE, CYCLES_Z80_LINE, CYCLES_S68K_LINE);
- #ifdef PICO_CD
- update_chips();
- #endif
- }
- #ifdef DRAW_FINISH_FUNC
- DRAW_FINISH_FUNC();
- #endif
- // V-int line (224 or 240)
- Pico.m.scanline=(short)y;
- // VDP FIFO
- pv->lwrite_cnt=0;
- Pico.video.status|=0x200;
- 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);
- }
- // V-Interrupt:
- 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 && (PicoOpt&4))
- z80_int();
- if (PicoOpt&1)
- sound_timers_and_dac(y);
- // get samples from sound chips
- #ifndef PICO_CD
- if (y == 224)
- #endif
- if (PsndOut)
- getSamples(y);
- // Run scanline:
- if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA());
- CPUS_RUN(CYCLES_M68K_LINE - CYCLES_M68K_VINT_LAG - CYCLES_M68K_ASD,
- CYCLES_Z80_LINE - CYCLES_Z80_ASD, CYCLES_S68K_LINE - CYCLES_S68K_ASD);
- #ifdef PICO_CD
- update_chips();
- #endif
- // PAL line count might actually be 313 according to Steve Snake, but that would complicate things.
- lines = Pico.m.pal ? 312 : 262;
- for (y++;y<lines;y++)
- {
- Pico.m.scanline=(short)y;
- PAD_DELAY
- #ifdef PICO_CD
- check_cd_dma();
- #endif
- if(PicoOpt&1)
- sound_timers_and_dac(y);
- // Run scanline:
- if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA());
- CPUS_RUN(CYCLES_M68K_LINE, CYCLES_Z80_LINE, CYCLES_S68K_LINE);
- #ifdef PICO_CD
- update_chips();
- #endif
- }
- // draw a frame just after vblank in alternative render mode
- if (!PicoSkipFrame && (PicoOpt&0x10))
- PicoFrameFull();
- return 0;
- }
- #undef PAD_DELAY
- #undef Z80_RUN
- #undef CPUS_RUN
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