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Noise table modification

This commit is contained in:
qeed 2009-06-25 13:44:52 +00:00
parent dbaa85bfc3
commit 6a34c0ab1a
1 changed files with 10 additions and 12 deletions
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22
src/sound.cpp
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@ -92,19 +92,13 @@ static const uint8 lengthtable[0x20]=
10,254, 20, 2, 40, 4, 80, 6, 160, 8, 60, 10, 14, 12, 26, 14,
12, 16, 24, 18, 48, 20, 96, 22, 192, 24, 72, 26, 16, 28, 32, 30
};
static const uint32 NoiseFreqTableNTSC[0x10] =
{
2,4,8,0x10,0x20,0x30,0x40,0x50,0x65,0x7f,0xbe,0xfe,0x17d,0x1fc,0x3f9,0x7f2
};
/* this seems to get double dragon 2 sound wrong so we'll revert
* to the old ones until we figure out what is wrong */
/*
static const uint32 NoiseFreqTableNTSC[0x10] =
{
4, 8, 16, 32, 64, 96, 128, 160, 202,
254, 380, 508, 762, 1016, 2034, 4068
};*/
};
static const uint32 NoiseFreqTablePAL[0x10] =
{
@ -859,7 +853,9 @@ static void RDoTriangleNoisePCMLQ(void)
if(noiseacc<=0)
{
rea2:
noiseacc+=NoiseFreqTable[PSG[0xE]&0xF]<<(16+2);
//used to added <<(16+2) when the noise table
//values were half.
noiseacc+=NoiseFreqTable[PSG[0xE]&0xF]<<(16+1);
nreg=(nreg<<1)+(((nreg>>nshift)^(nreg>>14))&1);
nreg&=0x7fff;
noiseout=amptab[(nreg>>0xe)];
@ -898,7 +894,9 @@ static void RDoTriangleNoisePCMLQ(void)
if(noiseacc<=0)
{
area2:
noiseacc+=NoiseFreqTable[PSG[0xE]&0xF]<<(16+2);
//used to be added <<(16+2) when the noise table
//values were half.
noiseacc+=NoiseFreqTable[PSG[0xE]&0xF]<<(16+1);
nreg=(nreg<<1)+(((nreg>>nshift)^(nreg>>14))&1);
nreg&=0x7fff;
noiseout=amptab[(nreg>>0xe)];
@ -949,7 +947,7 @@ static void RDoNoise(void)
if(!wlcount[3])
{
uint8 feedback;
wlcount[3]=NoiseFreqTable[PSG[0xE]&0xF]<<1;
wlcount[3]=NoiseFreqTable[PSG[0xE]&0xF];
feedback=((nreg>>8)&1)^((nreg>>14)&1);
nreg=(nreg<<1)+feedback;
nreg&=0x7fff;
@ -964,7 +962,7 @@ static void RDoNoise(void)
if(!wlcount[3])
{
uint8 feedback;
wlcount[3]=NoiseFreqTable[PSG[0xE]&0xF]<<1;
wlcount[3]=NoiseFreqTable[PSG[0xE]&0xF];
feedback=((nreg>>13)&1)^((nreg>>14)&1);
nreg=(nreg<<1)+feedback;
nreg&=0x7fff;