diff options
Diffstat (limited to 'plugins/dfsound/spu.c')
| -rw-r--r-- | plugins/dfsound/spu.c | 53 |
1 files changed, 22 insertions, 31 deletions
diff --git a/plugins/dfsound/spu.c b/plugins/dfsound/spu.c index b94fe90..791b27e 100644 --- a/plugins/dfsound/spu.c +++ b/plugins/dfsound/spu.c @@ -93,7 +93,8 @@ int iUseInterpolation=2; SPUCHAN s_chan[MAXCHAN+1]; // channel + 1 infos (1 is security for fmod handling) REVERBInfo rvb; -unsigned long dwNoiseVal=1; // global noise generator +unsigned int dwNoiseVal; // global noise generator +unsigned int dwNoiseCount; int iSpuAsyncWait=0; unsigned short spuCtrl=0; // some vars to store psx reg infos @@ -320,35 +321,6 @@ INLINE int FModChangeFrequency(int ch,int ns) //////////////////////////////////////////////////////////////////////// -// noise handler... just produces some noise data -// surely wrong... and no noise frequency (spuCtrl&0x3f00) will be used... -// and sometimes the noise will be used as fmod modulation... pfff - -INLINE int iGetNoiseVal(int ch) -{ - int fa; - - if((dwNoiseVal<<=1)&0x80000000L) - { - dwNoiseVal^=0x0040001L; - fa=((dwNoiseVal>>2)&0x7fff); - fa=-fa; - } - else fa=(dwNoiseVal>>2)&0x7fff; - - // mmm... depending on the noise freq we allow bigger/smaller changes to the previous val - fa=s_chan[ch].iOldNoise+((fa-s_chan[ch].iOldNoise)/((0x001f-((spuCtrl&0x3f00)>>9))+1)); - if(fa>32767L) fa=32767L; - if(fa<-32767L) fa=-32767L; - s_chan[ch].iOldNoise=fa; - - if(iUseInterpolation<2) // no gauss/cubic interpolation? - s_chan[ch].SB[29] = fa; // -> store noise val in "current sample" slot - return fa; -} - -//////////////////////////////////////////////////////////////////////// - INLINE void StoreInterpolationVal(int ch,int fa) { if(s_chan[ch].bFMod==2) // fmod freq channel @@ -631,6 +603,8 @@ make_do_samples(simple, , , static int do_samples_noise(int ch, int ns, int ns_to) { + int level, shift, bit; + s_chan[ch].spos += s_chan[ch].sinc * (ns_to - ns); while (s_chan[ch].spos >= 28*0x10000) { @@ -638,8 +612,25 @@ static int do_samples_noise(int ch, int ns, int ns_to) s_chan[ch].spos -= 28*0x10000; } + // modified from DrHell/shalma, no fraction + level = (spuCtrl >> 10) & 0x0f; + level = 0x8000 >> level; + for (; ns < ns_to; ns++) - ChanBuf[ns] = iGetNoiseVal(ch); + { + dwNoiseCount += 2; + if (dwNoiseCount >= level) + { + dwNoiseCount -= level; + shift = (dwNoiseVal >> 10) & 0x1f; + bit = (0x69696969 >> shift) & 1; + if (dwNoiseVal & 0x8000) + bit ^= 1; + dwNoiseVal = (dwNoiseVal << 1) | bit; + } + + ChanBuf[ns] = (signed short)dwNoiseVal; + } return -1; } |