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timers implemented for new z80 mode

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@460 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2008-05-26 18:58:21 +00:00
parent 4b9c588826
commit 43e6eaad0b
12 changed files with 128 additions and 81 deletions
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17
Pico/sound/sound.c
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@ -35,8 +35,8 @@ int PsndDacLine=0;
short *PsndOut=NULL; // PCM data buffer
// timers
int timer_a_next_oflow, timer_a_step; // in z80 cycles
//int
int timer_a_next_oflow, timer_a_step, timer_a_offset; // in z80 cycles
int timer_b_next_oflow, timer_b_step, timer_b_offset;
// sn76496
extern int *sn76496_regs;
@ -46,13 +46,15 @@ static void dac_recalculate(void)
{
int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;
if(PsndLen <= lines) {
if (PsndLen <= lines)
{
// shrinking algo
dac_cnt = -PsndLen;
len=1; pos=0;
dac_info[225] = 1;
for(i=226; i != 225; i++) {
for(i=226; i != 225; i++)
{
if (i >= lines) i = 0;
len = 0;
if(dac_cnt < 0) {
@ -63,11 +65,14 @@ static void dac_recalculate(void)
dac_cnt -= PsndLen;
dac_info[i] = (pos<<4)|len;
}
} else {
}
else
{
// stretching
dac_cnt = PsndLen;
pos=0;
for(i = 225; i != 224; i++) {
for(i = 225; i != 224; i++)
{
if (i >= lines) i = 0;
len=0;
while(dac_cnt >= 0) {

5
Pico/sound/ym2612.c
View file

@ -1584,8 +1584,6 @@ static int OPNWriteReg(int r, int v)
/* YM2612 local section */
/*******************************************************************************/
FM_ST *ym2612_st;
/* Generate samples for YM2612 */
int YM2612UpdateOne_(int *buffer, int length, int stereo, int is_buf_empty)
{
@ -1650,9 +1648,6 @@ int YM2612UpdateOne_(int *buffer, int length, int stereo, int is_buf_empty)
/* initialize YM2612 emulator */
void YM2612Init_(int clock, int rate)
{
// notaz
ym2612_st = &ym2612.OPN.ST;
memset(&ym2612, 0, sizeof(ym2612));
init_tables();

21
Pico/sound/ym2612.h
View file

@ -141,35 +141,16 @@ typedef struct
} YM2612;
#endif
extern FM_ST *ym2612_st;
#ifndef EXTERNAL_YM2612
extern YM2612 ym2612;
#endif
#define YM2612Read() ym2612_st->status
#define YM2612PicoTick(n) \
{ \
/* timer A */ \
if(ym2612_st->mode & 0x01 && (ym2612_st->TAT+=64*n) >= ym2612_st->TAC) { \
ym2612_st->TAT -= ym2612_st->TAC; \
if(ym2612_st->mode & 0x04) ym2612_st->status |= 1; \
} \
\
/* timer B */ \
if(ym2612_st->mode & 0x02 && (ym2612_st->TBT+=64*n) >= ym2612_st->TBC) { \
ym2612_st->TBT -= ym2612_st->TBC; \
if(ym2612_st->mode & 0x08) ym2612_st->status |= 2; \
} \
}
void YM2612Init_(int baseclock, int rate);
void YM2612ResetChip_(void);
int YM2612UpdateOne_(int *buffer, int length, int stereo, int is_buf_empty);
int YM2612Write_(unsigned int a, unsigned int v);
unsigned char YM2612Read_(void);
//unsigned char YM2612Read_(void);
int YM2612PicoTick_(int n);
void YM2612PicoStateLoad_(void);