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revised VDP fifo implementation

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This commit is contained in:
kub 2020-02-07 22:10:18 +01:00
parent 0f3703fd98
commit 17bd69adc6
5 changed files with 430 additions and 138 deletions
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37
pico/pico_cmn.c
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@ -72,27 +72,19 @@ static void do_hint(struct PicoVideo *pv)
}
}
static void do_timing_hacks_as(struct PicoVideo *pv, int vdp_slots, int cycles)
static void do_timing_hacks_end(struct PicoVideo *pv)
{
pv->lwrite_cnt += vdp_slots - Pico.m.dma_xfers * 2; // wrong *2
if (pv->lwrite_cnt > vdp_slots)
pv->lwrite_cnt = vdp_slots;
else if (pv->lwrite_cnt < 0)
pv->lwrite_cnt = 0;
if (Pico.m.dma_xfers)
SekCyclesBurn(CheckDMA(cycles));
PicoVideoFIFOSync(488);
}
static void do_timing_hacks_vb(int cycles)
static void do_timing_hacks_start(struct PicoVideo *pv)
{
if (unlikely(Pico.m.dma_xfers))
SekCyclesBurn(CheckDMA(cycles));
SekCyclesBurn(PicoVideoFIFOHint()); // prolong cpu HOLD if necessary
}
static int PicoFrameHints(void)
{
struct PicoVideo *pv = &Pico.video;
int vdp_slots = (Pico.video.reg[12] & 1) ? 18 : 16;
int lines, y, lines_vis, skip;
int vcnt_wrap, vcnt_adj;
unsigned int cycles;
@ -155,8 +147,9 @@ static int PicoFrameHints(void)
// Run scanline:
Pico.t.m68c_line_start = Pico.t.m68c_aim;
do_timing_hacks_as(pv, vdp_slots, CYCLES_M68K_LINE);
do_timing_hacks_start(pv);
CPUS_RUN(CYCLES_M68K_LINE);
do_timing_hacks_end(pv);
if (PicoLineHook) PicoLineHook();
pevt_log_m68k_o(EVT_NEXT_LINE);
@ -175,10 +168,6 @@ static int PicoFrameHints(void)
#endif
}
// VDP FIFO
pv->lwrite_cnt = 0;
Pico.video.status |= SR_EMPT;
memcpy(PicoIn.padInt, PicoIn.pad, sizeof(PicoIn.padInt));
PAD_DELAY();
@ -196,7 +185,7 @@ static int PicoFrameHints(void)
// 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)
Pico.t.m68c_line_start = Pico.t.m68c_aim;
do_timing_hacks_vb(CYCLES_M68K_VINT_LAG);
do_timing_hacks_start(pv);
CPUS_RUN(CYCLES_M68K_VINT_LAG);
pv->status |= SR_F;
@ -224,8 +213,8 @@ static int PicoFrameHints(void)
#endif
// Run scanline:
do_timing_hacks_vb(CYCLES_M68K_LINE - CYCLES_M68K_VINT_LAG);
CPUS_RUN(CYCLES_M68K_LINE - CYCLES_M68K_VINT_LAG);
do_timing_hacks_end(pv);
if (PicoLineHook) PicoLineHook();
pevt_log_m68k_o(EVT_NEXT_LINE);
@ -260,8 +249,9 @@ static int PicoFrameHints(void)
// Run scanline:
Pico.t.m68c_line_start = Pico.t.m68c_aim;
do_timing_hacks_vb(CYCLES_M68K_LINE);
do_timing_hacks_start(pv);
CPUS_RUN(CYCLES_M68K_LINE);
do_timing_hacks_end(pv);
if (PicoLineHook) PicoLineHook();
pevt_log_m68k_o(EVT_NEXT_LINE);
@ -271,8 +261,9 @@ static int PicoFrameHints(void)
unsigned int l = PicoIn.overclockM68k * lines / 100;
while (l-- > 0) {
Pico.t.m68c_cnt -= CYCLES_M68K_LINE;
do_timing_hacks_vb(CYCLES_M68K_LINE);
do_timing_hacks_start(pv);
SekSyncM68k();
do_timing_hacks_end(pv);
}
}
@ -282,7 +273,6 @@ static int PicoFrameHints(void)
// last scanline
Pico.m.scanline = y++;
pv->v_counter = 0xff;
pv->lwrite_cnt = 0;
PAD_DELAY();
@ -297,8 +287,9 @@ static int PicoFrameHints(void)
// Run scanline:
Pico.t.m68c_line_start = Pico.t.m68c_aim;
do_timing_hacks_as(pv, vdp_slots, CYCLES_M68K_LINE);
do_timing_hacks_start(pv);
CPUS_RUN(CYCLES_M68K_LINE);
do_timing_hacks_end(pv);
if (PicoLineHook) PicoLineHook();
pevt_log_m68k_o(EVT_NEXT_LINE);