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VERA: Implement PCM playback (again)

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This commit is contained in:
Natt Akuma 2022-03-19 20:59:17 +07:00
parent 689ed3bf65
commit 6df3d1e0df
3 changed files with 101 additions and 25 deletions
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7
src/engine/platform/sound/vera_psg.c
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@ -54,11 +54,8 @@ render(struct VERA_PSG* psg, int16_t *left, int16_t *right)
{
int l = 0;
int r = 0;
// TODO this is a currently speculated noise generation
// as the hardware and sources for it are not out in the public
// and the official emulator just uses rand()
psg->noiseOut=((psg->noiseOut<<1)|(psg->noiseState&1))&63;
psg->noiseState=(psg->noiseState<<1)|(((psg->noiseState>>1)^(psg->noiseState>>2)^(psg->noiseState>>4)^(psg->noiseState>>15))&1);
psg->noiseOut=((psg->noiseOut<<1)|(psg->noiseState&1))&63;
psg->noiseState=(psg->noiseState<<1)|(((psg->noiseState>>1)^(psg->noiseState>>2)^(psg->noiseState>>4)^(psg->noiseState>>15))&1);
for (int i = 0; i < 16; i++) {
struct VERAChannel *ch = &psg->channels[i];