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added damping and pseudoreverb

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This commit is contained in:
Michaël Banaan Ananas 2011-08-09 02:12:28 +00:00
parent e818d68438
commit 12336b62a2
1 changed files with 27 additions and 8 deletions
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35
src/emu/sound/ymf278b.c
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@ -55,6 +55,12 @@
June 4, 2003 - Changed to dual-license with LGPL for use in OpenMSX.
OpenMSX contributed a bugfix where looped samples were
not being addressed properly, causing pitch fluctuation.
......
TODO:
- accurate timing of envelopes
- LFO (vibrato, tremolo)
- integrate YMF262
*/
#include "emu.h"
@ -131,8 +137,8 @@ typedef struct
UINT32 romsize;
int clock;
INT32 volume[256*4]; // precalculated attenuation values with some marging for enveloppe and pan levels
int pan_left[16], pan_right[16]; // pan volume offsets
INT32 volume[256*4]; // precalculated attenuation values with some margin for envelope and pan levels
int pan_left[16],pan_right[16]; // pan volume offsets
INT32 mix_level[8];
sound_stream * stream;
@ -235,9 +241,14 @@ static void ymf278b_envelope_next(YMF278BSlot *slot)
slot->env_step++;
if(slot->DL)
{
int rate = ymf278b_compute_rate(slot, slot->D1R);
LOG(("YMF278B: Decay step 1, dl=%d, val = %d rate = %d, delay = %g\n", slot->DL, slot->D1R, rate, ymf278_compute_decay_rate(rate)*1000.0));
int rate;
// rate override with damping/pseudo reverb
// NOTE: pseudo reverb starts at 0dB here, but should start at -18dB (which is actually between D1 and D2)
if (slot->DAMP) rate = 63;
else if (slot->PRVB) rate = 5;
else rate = ymf278b_compute_rate(slot, slot->D1R);
LOG(("YMF278B: Decay step 1, dl=%d, val = %d rate = %d, delay = %g\n", slot->DL, slot->D1R, rate, ymf278_compute_decay_rate(rate)*1000.0));
if(rate<4)
slot->env_vol_step = 0;
else
@ -249,7 +260,11 @@ static void ymf278b_envelope_next(YMF278BSlot *slot)
if(slot->env_step == 2)
{
// Decay 2
int rate = ymf278b_compute_rate(slot, slot->D2R);
int rate;
// rate override with damping/pseudo reverb
if (slot->DAMP) rate = 63;
else if (slot->PRVB) rate = 5;
else rate = ymf278b_compute_rate(slot, slot->D2R);
LOG(("YMF278B: Decay step 2, val = %d, rate = %d, delay = %g, current vol = %d\n", slot->D2R, rate, ymf278_compute_decay_rate(rate)*1000.0, slot->env_vol >> 23));
if(rate<4)
@ -273,7 +288,11 @@ static void ymf278b_envelope_next(YMF278BSlot *slot)
if(slot->env_step == 4)
{
// Release
int rate = ymf278b_compute_rate(slot, slot->RR);
int rate;
// rate override with damping/pseudo reverb
if (slot->DAMP) rate = 63;
else if (slot->PRVB) rate = 5;
else rate = ymf278b_compute_rate(slot, slot->RR);
LOG(("YMF278B: Release, val = %d, rate = %d, delay = %g\n", slot->RR, rate, ymf278_compute_decay_rate(rate)*1000.0));
if(rate<4)
@ -598,7 +617,7 @@ static void ymf278b_C_w(YMF278BChip *chip, UINT8 reg, UINT8 data, int init)
break;
case 4:
slot->pan = data&0xf;
slot->DAMP = data&0x40;
slot->DAMP = (data&0x40)>>6;
if (data & 0x80)
{
unsigned int step;
@ -944,7 +963,7 @@ static DEVICE_START( ymf278b )
chip->pan_right[i] = i < 8 ? 0 : i < 10 ? 256 : (16-i)*8;
}
// Mixing levels, units are -3dB, and add some marging to avoid clipping
// Mixing levels, units are -3dB, and add some margin to avoid clipping
for(i=0; i<7; i++)
chip->mix_level[i] = chip->volume[8*i+8];
chip->mix_level[7] = 0;