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Corrected read of SB Pro mixer registers on SB16. Fixes sound in One Must Fall, Jazz Jackrabbit and probably other games.

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This commit is contained in:
SarahW 2017-10-18 20:03:56 +01:00
commit 6b7682105b
1 changed files with 15 additions and 1 deletions
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16
src/sound_sb.c
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@ -768,8 +768,22 @@ uint8_t sb_ct1745_mixer_read(uint16_t addr, void *p)
}
switch (mixer->index)
{
case 0x00: case 0x04: case 0x0A: case 0x22: case 0x26: case 0x28: case 0x2E:
case 0x00:
return mixer->regs[mixer->index];
/*SB Pro compatibility*/
case 0x04:
return ((mixer->regs[0x33] >> 4) & 0x0f) | (mixer->regs[0x32] & 0xf0);
case 0x0a:
return (mixer->regs[0x2a] - 10) / 3;
case 0x22:
return ((mixer->regs[0x31] >> 4) & 0x0f) | (mixer->regs[0x30] & 0xf0);
case 0x26:
return ((mixer->regs[0x35] >> 4) & 0x0f) | (mixer->regs[0x34] & 0xf0);
case 0x28:
return ((mixer->regs[0x37] >> 4) & 0x0f) | (mixer->regs[0x36] & 0xf0);
case 0x2e:
return ((mixer->regs[0x39] >> 4) & 0x0f) | (mixer->regs[0x38] & 0xf0);
case 0x48:
// Undocumented. The Creative Windows Mixer calls this after calling 3C (input selector). even when writing.