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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) {