+#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
+
+// 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) \
+ { \
+ if (Pico.m.z80Run & 2) z80CycleAim += z80_cycles; \
+ else { \
+ int cnt = SekCyclesDone() - z80startCycle; \
+ cnt = (cnt>>1)-(cnt>>5); \
+ if (cnt > (z80_cycles)) cnt = z80_cycles; \
+ Pico.m.z80Run |= 2; \
+ z80CycleAim+=cnt; \
+ } \
+ total_z80+=z80_run(z80CycleAim-total_z80); \
+ } \
+}
+
+// Accurate but slower frame which does hints
+static int PicoFrameHints(void)
+{
+ struct PicoVideo *pv=&Pico.video;
+ int total_z80=0,lines,y,lines_vis = 224,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();
+
+ 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)
+ SekRun(CYCLES_M68K_ASD);
+ Z80_RUN(CYCLES_Z80_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
+
+ // 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);
+
+ // get samples from sound chips
+ if(y == 32 && PsndOut)
+ emustatus &= ~1;
+ else if((y == 224 || y == line_sample) && PsndOut)
+ getSamples(y);
+
+ // Run scanline:
+ if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA());
+ SekRun(CYCLES_M68K_LINE);
+ Z80_RUN(CYCLES_Z80_LINE);
+ }
+
+ // V-int line (224 or 240)
+ Pico.m.scanline=(short)y;
+
+ // VDP FIFO
+ pv->lwrite_cnt=0;
+ Pico.video.status|=0x200;
+
+ PAD_DELAY
+
+ // 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)
+ SekRun(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
+ if ((y == 224) && PsndOut)
+ getSamples(y);
+
+ // Run scanline:
+ if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA());
+ SekRun(CYCLES_M68K_LINE - CYCLES_M68K_VINT_LAG - CYCLES_M68K_ASD);
+ Z80_RUN(CYCLES_Z80_LINE - CYCLES_Z80_ASD);
+
+ // 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
+
+ if(PicoOpt&1)
+ sound_timers_and_dac(y);
+
+ // Run scanline:
+ if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA());
+ SekRun(CYCLES_M68K_LINE);
+ Z80_RUN(CYCLES_Z80_LINE);
+ }
+
+ // draw a frame just after vblank in alternative render mode
+ if (!PicoSkipFrame && (PicoOpt&0x10))
+ PicoFrameFull();
+
+ return 0;
+}
+
+#undef PAD_DELAY
+#undef Z80_RUN
+