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handle frequent psg updates

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This commit is contained in:
notaz 2017-09-30 22:55:57 +03:00
parent 5103774f6d
commit 5d638db094
4 changed files with 66 additions and 21 deletions
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38
pico/memory.c
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@ -385,6 +385,28 @@ void NOINLINE ctl_write_z80reset(u32 d)
}
}
static int get_scanline(int is_from_z80);
static void psg_write_68k(u32 d)
{
// look for volume write and update if needed
if ((d & 0x90) == 0x90 && PsndPsgLine < Pico.m.scanline)
PsndDoPSG(Pico.m.scanline);
SN76496Write(d);
}
static void psg_write_z80(u32 d)
{
if ((d & 0x90) == 0x90) {
int scanline = get_scanline(1);
if (PsndPsgLine < scanline)
PsndDoPSG(scanline);
}
SN76496Write(d);
}
// -----------------------------------------------------------------
#ifndef _ASM_MEMORY_C
@ -528,8 +550,7 @@ static void PicoWrite8_z80(u32 a, u32 d)
}
// TODO: probably other VDP access too? Maybe more mirrors?
if ((a & 0x7ff9) == 0x7f11) { // PSG Sound
if (PicoOpt & POPT_EN_PSG)
SN76496Write(d);
psg_write_68k(d);
return;
}
if ((a & 0x7f00) == 0x6000) // Z80 BANK register
@ -703,8 +724,7 @@ static u32 PicoRead16_vdp(u32 a)
static void PicoWrite8_vdp(u32 a, u32 d)
{
if ((a & 0x00f9) == 0x0011) { // PSG Sound
if (PicoOpt & POPT_EN_PSG)
SN76496Write(d);
psg_write_68k(d);
return;
}
if ((a & 0x00e0) == 0x0000) {
@ -718,11 +738,8 @@ static void PicoWrite8_vdp(u32 a, u32 d)
static void PicoWrite16_vdp(u32 a, u32 d)
{
if ((a & 0x00f9) == 0x0010) { // PSG Sound
if (PicoOpt & POPT_EN_PSG)
SN76496Write(d);
return;
}
if ((a & 0x00f9) == 0x0010) // PSG Sound
psg_write_68k(d);
if ((a & 0x00e0) == 0x0000) {
PicoVideoWrite(a, d);
return;
@ -1198,8 +1215,7 @@ static void z80_md_vdp_br_write(unsigned int a, unsigned char data)
{
if ((a&0xfff9) == 0x7f11) // 7f11 7f13 7f15 7f17
{
if (PicoOpt & POPT_EN_PSG)
SN76496Write(data);
psg_write_z80(data);
return;
}
// at least VDP data writes hang my machine