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Reverted bipolar output due to problems in MESS, code is commented out.

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This commit is contained in:
Jonathan Gevaryahu 2009-11-15 05:38:25 +00:00
parent ff546330ef
commit aaf66f0744
1 changed files with 9 additions and 3 deletions
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12
src/emu/sound/sn76496.c
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@ -47,7 +47,7 @@
14/11/2009 : Lord Nightmare
Removed STEP mess, vastly simplifying the code. Made output bipolar rather
than always above the 0 line.
than always above the 0 line, but disabled that code due to pending issues.
TODO: * Implement a function for setting stereo regs for the game gear.
Requires making the core support both mono and stereo, and have
@ -69,7 +69,8 @@
#include "sn76496.h"
#define MAX_OUTPUT 0x3fff
#define MAX_OUTPUT 0x7fff
// make the above 0x3fff if using bipolar output
#define NOISEMODE (R->Register[6]&4)?1:0
@ -241,11 +242,16 @@ static STREAM_UPDATE( SN76496Update )
R->OldNoise = R->RNG & 1;
R->Count[3] = R->Period[3];
}
/* //bipolar output, doesn't seem to work right with sonic 2 on gamegear at least
out = (R->Output[0]?R->Volume[0]:(0-R->Volume[0]))
+(R->Output[1]?R->Volume[1]:(0-R->Volume[1]))
+(R->Output[2]?R->Volume[2]:(0-R->Volume[2]))
+(R->Output[3]?R->Volume[3]:(0-R->Volume[3]));
*/
out = (R->Output[0]?R->Volume[0]:0)
+(R->Output[1]?R->Volume[1]:0)
+(R->Output[2]?R->Volume[2]:0)
+(R->Output[3]?R->Volume[3]:0);
*(buffer++) = out;