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Mix sound sources in 32-bit buffer, then clip to 16-bit for output. Fixes overflow in some situations, eg MegaRace on SB16.

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This commit is contained in:
SarahW 2016-05-22 16:04:19 +01:00
commit d2b6ea7fa3
15 changed files with 60 additions and 37 deletions
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4
src/sound_gus.c
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@ -1047,7 +1047,7 @@ void gus_poll_wave(void *p)
pollgusirqs(gus);
}
static void gus_get_buffer(int16_t *buffer, int len, void *p)
static void gus_get_buffer(int32_t *buffer, int len, void *p)
{
gus_t *gus = (gus_t *)p;
int c;
@ -1056,7 +1056,7 @@ static void gus_get_buffer(int16_t *buffer, int len, void *p)
for (c = 0; c < len * 2; c++)
{
buffer[c] += gus->buffer[c & 1][c >> 1];
buffer[c] += (int32_t)gus->buffer[c & 1][c >> 1];
}
gus->pos = 0;