From 9cf0ddbcdf4a2d72348df35695d09b36d23a2d0a Mon Sep 17 00:00:00 2001 From: notaz Date: Mon, 28 Feb 2011 02:13:23 +0200 Subject: spu: refactor adsr (simplify code) --- plugins/dfsound/adsr.c | 174 +++++++++++++++++++------------------------------ 1 file changed, 67 insertions(+), 107 deletions(-) (limited to 'plugins/dfsound') diff --git a/plugins/dfsound/adsr.c b/plugins/dfsound/adsr.c index 1e397af..47eccb3 100644 --- a/plugins/dfsound/adsr.c +++ b/plugins/dfsound/adsr.c @@ -26,11 +26,11 @@ // ADSR func //////////////////////////////////////////////////////////////////////// -unsigned long RateTable[160]; +unsigned int RateTable[160]; void InitADSR(void) // INIT ADSR { - unsigned long r,rs,rd;int i; + unsigned int r,rs,rd;int i; memset(RateTable,0,sizeof(unsigned long)*160); // build the rate table according to Neill's rules (see at bottom of file) @@ -61,26 +61,20 @@ INLINE void StartADSR(int ch) // MIX ADSR INLINE int MixADSR(int ch) // MIX ADSR { + static const char ratetable_offset[8] = { 0, 4, 6, 8, 9, 10, 11, 12 }; + int rto; + if(s_chan[ch].bStop) // should be stopped: { // do release if(s_chan[ch].ADSRX.ReleaseModeExp) { - switch((s_chan[ch].ADSRX.EnvelopeVol>>28)&0x7) - { - case 0: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +0 + 32]; break; - case 1: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +4 + 32]; break; - case 2: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +6 + 32]; break; - case 3: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +8 + 32]; break; - case 4: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +9 + 32]; break; - case 5: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +10+ 32]; break; - case 6: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +11+ 32]; break; - case 7: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +12+ 32]; break; - } + rto=ratetable_offset[(s_chan[ch].ADSRX.EnvelopeVol>>28)&0x7]; } else { - s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x0C + 32]; + rto=12; } + s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 + rto + 32]; if(s_chan[ch].ADSRX.EnvelopeVol<0) { @@ -93,107 +87,72 @@ INLINE int MixADSR(int ch) // MIX ADSR //s_chan[ch].bNoise=0; } - return s_chan[ch].ADSRX.EnvelopeVol>>21; + goto done; } - else // not stopped yet? - { - if(s_chan[ch].ADSRX.State==0) // -> attack - { - if(s_chan[ch].ADSRX.AttackModeExp) - { - if(s_chan[ch].ADSRX.EnvelopeVol<0x60000000) - s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(s_chan[ch].ADSRX.AttackRate^0x7F)-0x10 + 32]; - else - s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(s_chan[ch].ADSRX.AttackRate^0x7F)-0x18 + 32]; - } - else - { - s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(s_chan[ch].ADSRX.AttackRate^0x7F)-0x10 + 32]; - } - if(s_chan[ch].ADSRX.EnvelopeVol<0) - { - s_chan[ch].ADSRX.EnvelopeVol=0x7FFFFFFF; - s_chan[ch].ADSRX.State=1; - } + switch(s_chan[ch].ADSRX.State) // not stopped yet + { + case 0: // -> attack + rto=8; + if(s_chan[ch].ADSRX.AttackModeExp&&s_chan[ch].ADSRX.EnvelopeVol>=0x60000000) + rto = 0; + s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(s_chan[ch].ADSRX.AttackRate^0x7F)-0x18 + rto + 32]; + + if(s_chan[ch].ADSRX.EnvelopeVol<0) + { + s_chan[ch].ADSRX.EnvelopeVol=0x7FFFFFFF; + s_chan[ch].ADSRX.State=1; + } + break; - return s_chan[ch].ADSRX.EnvelopeVol>>21; - } //--------------------------------------------------// - if(s_chan[ch].ADSRX.State==1) // -> decay - { - switch((s_chan[ch].ADSRX.EnvelopeVol>>28)&0x7) - { - case 0: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+0 + 32]; break; - case 1: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+4 + 32]; break; - case 2: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+6 + 32]; break; - case 3: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+8 + 32]; break; - case 4: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+9 + 32]; break; - case 5: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+10+ 32]; break; - case 6: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+11+ 32]; break; - case 7: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+12+ 32]; break; - } + case 1: // -> decay + rto=ratetable_offset[(s_chan[ch].ADSRX.EnvelopeVol>>28)&0x7]; + s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+ rto + 32]; - if(s_chan[ch].ADSRX.EnvelopeVol<0) s_chan[ch].ADSRX.EnvelopeVol=0; - if(((s_chan[ch].ADSRX.EnvelopeVol>>27)&0xF) <= s_chan[ch].ADSRX.SustainLevel) - { - s_chan[ch].ADSRX.State=2; - } + if(s_chan[ch].ADSRX.EnvelopeVol<0) s_chan[ch].ADSRX.EnvelopeVol=0; + if(((s_chan[ch].ADSRX.EnvelopeVol>>27)&0xF) <= s_chan[ch].ADSRX.SustainLevel) + { + s_chan[ch].ADSRX.State=2; + } + break; - return s_chan[ch].ADSRX.EnvelopeVol>>21; - } //--------------------------------------------------// - if(s_chan[ch].ADSRX.State==2) // -> sustain - { - if(s_chan[ch].ADSRX.SustainIncrease) - { - if(s_chan[ch].ADSRX.SustainModeExp) - { - if(s_chan[ch].ADSRX.EnvelopeVol<0x60000000) - s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(s_chan[ch].ADSRX.SustainRate^0x7F)-0x10 + 32]; - else - s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(s_chan[ch].ADSRX.SustainRate^0x7F)-0x18 + 32]; - } - else - { - s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(s_chan[ch].ADSRX.SustainRate^0x7F)-0x10 + 32]; - } - - if(s_chan[ch].ADSRX.EnvelopeVol<0) - { - s_chan[ch].ADSRX.EnvelopeVol=0x7FFFFFFF; - } - } - else - { - if(s_chan[ch].ADSRX.SustainModeExp) - { - switch((s_chan[ch].ADSRX.EnvelopeVol>>28)&0x7) - { - case 0: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +0 + 32];break; - case 1: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +4 + 32];break; - case 2: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +6 + 32];break; - case 3: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +8 + 32];break; - case 4: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +9 + 32];break; - case 5: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +10+ 32];break; - case 6: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +11+ 32];break; - case 7: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +12+ 32];break; - } - } - else - { - s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x0F + 32]; - } - - if(s_chan[ch].ADSRX.EnvelopeVol<0) - { - s_chan[ch].ADSRX.EnvelopeVol=0; - } - } - return s_chan[ch].ADSRX.EnvelopeVol>>21; - } + case 2: // -> sustain + if(s_chan[ch].ADSRX.SustainIncrease) + { + rto=8; + if(s_chan[ch].ADSRX.SustainModeExp&&s_chan[ch].ADSRX.EnvelopeVol>=0x60000000) + rto=0; + s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(s_chan[ch].ADSRX.SustainRate^0x7F)-0x18 + rto + 32]; + + if(s_chan[ch].ADSRX.EnvelopeVol<0) + { + s_chan[ch].ADSRX.EnvelopeVol=0x7FFFFFFF; + } + } + else + { + if(s_chan[ch].ADSRX.SustainModeExp) + { + rto=ratetable_offset[(s_chan[ch].ADSRX.EnvelopeVol>>28)&0x7]; + } + else + { + rto=12; + } + s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B + rto + 32]; + + if(s_chan[ch].ADSRX.EnvelopeVol<0) + { + s_chan[ch].ADSRX.EnvelopeVol=0; + } + } + break; } - return 0; + +done: + return s_chan[ch].ADSRX.EnvelopeVol>>21; } #endif @@ -637,3 +596,4 @@ Logarithmic release mode: ----------------------------------------------------------------------------- */ +// vim:shiftwidth=1:expandtab -- cgit v1.2.3