+// 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_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 (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; \
}
-#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); \
- } \
-}
-
// CPUS_RUN
#ifndef PICO_CD
-#define CPUS_RUN(m68k_cycles,z80_cycles,s68k_cycles) \
- SekRunM68k(m68k_cycles); \
- Z80_RUN(z80_cycles);
+#define CPUS_RUN(m68k_cycles,s68k_cycles) \
+ SekRunM68k(m68k_cycles);
#else
-#define CPUS_RUN(m68k_cycles,z80_cycles,s68k_cycles) \
+#define CPUS_RUN(m68k_cycles,s68k_cycles) \
{ \
- if ((PicoOpt & 0x2000) && (Pico_mcd->m.busreq&3) == 1) { \
+ 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); \
} \
- Z80_RUN(z80_cycles); \
}
#endif
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 lines, y, lines_vis = 224, line_sample, skip;
int hint; // Hint 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) {
- //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();
+ z80_resetCycles();
#ifdef PICO_CD
SekCyclesResetS68k();
#endif
+ PsndDacLine = 0;
pv->status&=~0x88; // clear V-Int, come out of vblank
//dprintf("-hint: %i", hint);
// This is to make active scan longer (needed for Double Dragon 2, mainly)
- CPUS_RUN(CYCLES_M68K_ASD, CYCLES_Z80_ASD, CYCLES_S68K_ASD);
+ CPUS_RUN(CYCLES_M68K_ASD, CYCLES_S68K_ASD);
- for (y=0;y<lines_vis;y++)
+ for (y = 0; y < lines_vis; y++)
{
- Pico.m.scanline=(short)y;
+ Pico.m.scanline = y;
// VDP FIFO
pv->lwrite_cnt -= 12;
}
// 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)
+ 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
- PicoLine(y);
-
- if(PicoOpt&1)
- sound_timers_and_dac(y);
+ skip = 1;
+ }
+ }
#ifndef PICO_CD
// get samples from sound chips
- if(y == 32 && PsndOut)
+ if (y == 32 && PsndOut)
emustatus &= ~1;
- else if((y == 224 || y == line_sample) && PsndOut)
+ else if ((y == 224 || y == line_sample) && PsndOut)
+ {
+ if (Pico.m.z80Run && (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_Z80_LINE, CYCLES_S68K_LINE);
+ CPUS_RUN(CYCLES_M68K_LINE, CYCLES_S68K_LINE);
#ifdef PICO_CD
update_chips();
+#else
+ if (PicoLineHook) PicoLineHook(1);
+#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=(short)y;
+ Pico.m.scanline = y;
// VDP FIFO
pv->lwrite_cnt=0;
// 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))
+ if (Pico.m.z80Run && (PicoOpt&POPT_EN_Z80)) {
+ PicoSyncZ80(SekCycleCnt);
+ elprintf(EL_INTS, "zint");
z80_int();
-
- if (PicoOpt&1)
- sound_timers_and_dac(y);
+ }
// 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_Z80_LINE - CYCLES_Z80_ASD, CYCLES_S68K_LINE - CYCLES_S68K_ASD);
+ CYCLES_S68K_LINE - CYCLES_S68K_ASD);
#ifdef PICO_CD
- update_chips();
+ update_chips();
+#else
+ if (PicoLineHook) PicoLineHook(1);
#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++)
+ for (y++; y < lines; y++)
{
- Pico.m.scanline=(short)y;
+ Pico.m.scanline = 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);
+ CPUS_RUN(CYCLES_M68K_LINE, CYCLES_S68K_LINE);
#ifdef PICO_CD
update_chips();
+#else
+ if (PicoLineHook) PicoLineHook(1);
#endif
}
- // draw a frame just after vblank in alternative render mode
- if (!PicoSkipFrame && (PicoOpt&0x10))
- PicoFrameFull();
+ // sync z80
+ if (Pico.m.z80Run && (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 Z80_RUN
#undef CPUS_RUN
notaz.gp2x.de / picodrive.git / blobdiff