RaySollium99/picodrive
1
0
Fork 0
mirror of https://github.com/RaySollium99/picodrive.git synced 2025-09-06 07:38:05 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

new z80 scheduling method, timers are still wip

Browse source 
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@459 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2008-05-25 21:25:46 +00:00
parent 170435846c
commit 4b9c588826
15 changed files with 377 additions and 364 deletions
Download patch file Download diff file Expand all files Collapse all files

56
Pico/sound/sound.c
View file

@ -21,7 +21,7 @@ void (*PsndMix_32_to_16l)(short *dest, int *src, int count) = mix_32_to_16l_ster
static int PsndBuffer[2*44100/50];
// dac
static unsigned short dac_info[312]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample
static unsigned short dac_info[312+4]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample
// cdda output buffer
short cdda_out_buffer[2*1152];
@ -31,8 +31,13 @@ int PsndRate=0;
int PsndLen=0; // number of mono samples, multiply by 2 for stereo
int PsndLen_exc_add=0; // this is for non-integer sample counts per line, eg. 22050/60
int PsndLen_exc_cnt=0;
int PsndDacLine=0;
short *PsndOut=NULL; // PCM data buffer
// timers
int timer_a_next_oflow, timer_a_step; // in z80 cycles
//int
// sn76496
extern int *sn76496_regs;
@ -83,6 +88,8 @@ static void dac_recalculate(void)
if (PsndLen_exc_add) len++;
dac_info[224] = (pos<<4)|len;
}
for (i = lines; i < sizeof(dac_info) / sizeof(dac_info[0]); i++)
dac_info[i] = 0;
//for(i=len=0; i < lines; i++) {
// printf("%03i : %03i : %i\n", i, dac_info[i]>>4, dac_info[i]&0xf);
// len+=dac_info[i]&0xf;
@ -100,7 +107,7 @@ PICO_INTERNAL void PsndReset(void)
// also clear the internal registers+addr line
ym2612_regs = YM2612GetRegs();
memset(ym2612_regs, 0, 0x200+4);
z80startCycle = z80stopCycle = 0;
timers_reset();
PsndRerate(0);
}
@ -164,44 +171,25 @@ void PsndRerate(int preserve_state)
}
// This is called once per raster (aka line), but not necessarily for every line
PICO_INTERNAL void Psnd_timers_and_dac(int raster)
PICO_INTERNAL void PsndDoDAC(int line_to)
{
int pos, len;
int do_dac = PsndOut && (PicoOpt&POPT_EN_FM) && *ym2612_dacen;
// int do_pcm = PsndOut && (PicoAHW&1) && (PicoOpt&0x400);
int pos, pos1, len;
int dout = ym2612.dacout;
int line_from = PsndDacLine;
// Our raster lasts 63.61323/64.102564 microseconds (NTSC/PAL)
YM2612PicoTick(1);
PsndDacLine = line_to + 1;
if (!do_dac /*&& !do_pcm*/) return;
pos=dac_info[raster], len=pos&0xf;
pos =dac_info[line_from]>>4;
pos1=dac_info[line_to];
len = ((pos1>>4)-pos) + (pos1&0xf);
if (!len) return;
pos>>=4;
if (do_dac)
{
if (PicoOpt & POPT_EN_STEREO) {
short *d = PsndOut + pos*2;
int dout = *ym2612_dacout;
if(PicoOpt&POPT_EN_STEREO) {
// some manual loop unrolling here :)
d[0] = dout;
if (len > 1) {
d[2] = dout;
if (len > 2)
d[4] = dout;
}
} else {
short *d = PsndOut + pos;
d[0] = dout;
if (len > 1) {
d[1] = dout;
if (len > 2)
d[2] = dout;
}
}
for (; len > 0; len--, d+=2) *d = dout;
} else {
short *d = PsndOut + pos;
for (; len > 0; len--, d++) *d = dout;
}
#if 0