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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 14/11/2009 : Lord Nightmare
Removed STEP mess, vastly simplifying the code. Made output bipolar rather 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. TODO: * Implement a function for setting stereo regs for the game gear.
Requires making the core support both mono and stereo, and have Requires making the core support both mono and stereo, and have
@ -69,7 +69,8 @@
#include "sn76496.h" #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 #define NOISEMODE (R->Register[6]&4)?1:0
@ -241,11 +242,16 @@ static STREAM_UPDATE( SN76496Update )
R->OldNoise = R->RNG & 1; R->OldNoise = R->RNG & 1;
R->Count[3] = R->Period[3]; 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])) out = (R->Output[0]?R->Volume[0]:(0-R->Volume[0]))
+(R->Output[1]?R->Volume[1]:(0-R->Volume[1])) +(R->Output[1]?R->Volume[1]:(0-R->Volume[1]))
+(R->Output[2]?R->Volume[2]:(0-R->Volume[2])) +(R->Output[2]?R->Volume[2]:(0-R->Volume[2]))
+(R->Output[3]?R->Volume[3]:(0-R->Volume[3])); +(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; *(buffer++) = out;