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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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15
src/soundopenal.c
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@ -141,9 +141,10 @@ void inital()
#endif
}
void givealbuffer(int16_t *buf)
void givealbuffer(int32_t *buf)
{
#ifdef USE_OPENAL
int16_t buf16[BUFLEN*2];
int processed;
int state;
@ -172,14 +173,24 @@ void givealbuffer(int16_t *buf)
if (processed>=1)
{
int c;
ALuint buffer;
alSourceUnqueueBuffers(source[0], 1, &buffer);
// printf("U ");
check();
for (c=0;c<BUFLEN*2;c++)
{
if (buf[c] < -32768)
buf16[c] = -32768;
else if (buf[c] > 32767)
buf16[c] = 32767;
else
buf16[c] = buf[c];
}
// for (c=0;c<BUFLEN*2;c++) buf[c]^=0x8000;
alBufferData(buffer, AL_FORMAT_STEREO16, buf, BUFLEN*2*2, FREQ);
alBufferData(buffer, AL_FORMAT_STEREO16, buf16, BUFLEN*2*2, FREQ);
// printf("B ");
check();