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#include "SND_channel.h"
#include "registers.h"
#include "SND_work.h"
static int sMasterPan = -1;
static u8 sOrgVolume[SND_CHANNEL_COUNT];
static u8 sOrgPan[SND_CHANNEL_COUNT];
static int sSurroundDecay;
static int CalcSurroundDecay(int vol, int pan);
void SND_SetupChannelPcm(int chnIdx, const void *data, int format, int loop, int loopStart, int loopLength, int volume, int volumeDiv, int timer, int pan) {
int off = chnIdx * 0x10;
sOrgPan[chnIdx] = (u8)pan;
if (sMasterPan >= 0)
pan = sMasterPan;
sOrgVolume[chnIdx] = (u8)volume;
if (sSurroundDecay > 0 && (1 << chnIdx) & 0xFFF5) {
volume = CalcSurroundDecay(volume, pan);
}
reg_SOUNDoffCNT(off) = (u32)((format << 29) | (loop << 27) | (pan << 16) | (volumeDiv << 8) | (volume));
reg_SOUNDoffTMR(off) = (u16)(0x10000 - timer);
reg_SOUNDoffPNT(off) = (u16)loopStart;
reg_SOUNDoffLEN(off) = (u32)loopLength;
reg_SOUNDoffSAD(off) = (u32)data;
}
void SND_SetupChannelPsg(int chnIdx, int duty, int volume, int volumeDiv, int timer, int pan) {
int off = chnIdx * 0x10;
sOrgPan[chnIdx] = (u8)pan;
if (sMasterPan >= 0)
pan = sMasterPan;
sOrgVolume[chnIdx] = (u8)volume;
if (sSurroundDecay > 0 && (1 << chnIdx) & 0xFFF5) {
volume = CalcSurroundDecay(volume, pan);
}
reg_SOUNDoffCNT(off) = (u32)(0x60000000 | (duty << 24) | (pan << 16) | (volumeDiv << 8) | volume);
reg_SOUNDoffTMR(off) = (u16)(0x10000 - timer);
}
void SND_SetupChannelNoise(int chnIdx, int volume, int volumeDiv, int timer, int pan) {
int off = chnIdx * 0x10;
sOrgPan[chnIdx] = (u8)pan;
if (sMasterPan >= 0)
pan = sMasterPan;
sOrgVolume[chnIdx] = (u8)volume;
if (sSurroundDecay > 0 && (1 << chnIdx) & 0xFFF5) {
volume = CalcSurroundDecay(volume, pan);
}
reg_SOUNDoffCNT(off) = (u32)(0x60000000 | (pan << 16) | (volumeDiv << 8) | volume);
reg_SOUNDoffTMR(off) = (u16)(0x10000 - timer);
}
void SND_StopChannel(int idx, int hold) {
vu32 *reg = ®_SOUNDxCNT(idx);
u32 v = *reg;
// disable channel
v &= ~0x80000000;
// set hold flag
if (hold & 1)
v |= 0x8000;
*reg = v;
}
void SND_SetChannelVolume(int chnIdx, int vol, int volDiv) {
sOrgVolume[chnIdx] = (u8)vol;
if (sSurroundDecay > 0 && (1 << chnIdx) & 0xFFF5) {
int pan = reg_SOUNDxCNT_PAN(chnIdx);
vol = CalcSurroundDecay(vol, pan);
}
reg_SOUNDxCNT_VOLS(chnIdx) = (u16)((volDiv << 8) | vol);
}
void SND_SetChannelTimer(int chnIdx, int timer) {
reg_SOUNDxTMR(chnIdx) = (u16)(0x10000 - timer);
}
void SND_SetChannelPan(int chnIdx, int pan) {
sOrgPan[chnIdx] = (u8)pan;
if (sMasterPan >= 0) {
pan = sMasterPan;
}
reg_SOUNDxCNT_PAN(chnIdx) = (u8)pan;
if (sSurroundDecay > 0 && (1 << chnIdx) & 0xFFF5) {
reg_SOUNDxCNT_VOL(chnIdx) = (u8)CalcSurroundDecay(sOrgVolume[chnIdx], pan);
}
}
BOOL SND_IsChannelActive(int chnIdx) {
return (reg_SOUNDxCNT_STAT(chnIdx) & 0x80) != 0;
}
void SND_SetMasterPan(int pan) {
sMasterPan = pan;
if (pan >= 0) {
for (int i = 0; i < SND_CHANNEL_COUNT; i++) {
reg_SOUNDxCNT_PAN(i) = (u8)pan;
}
} else {
for (int i = 0; i < SND_CHANNEL_COUNT; i++) {
reg_SOUNDxCNT_PAN(i) = sOrgPan[i];
}
}
}
u32 SND_GetChannelControl(int chnIdx) {
return reg_SOUNDxCNT(chnIdx);
}
void SNDi_SetSurroundDecay(int decay) {
sSurroundDecay = decay;
for (int i = 0; i < SND_CHANNEL_COUNT; i++) {
// do not process channel 1+3 (capture playback channels)
if ((1 << i) & 0xFFF5) {
int pan = reg_SOUNDxCNT_PAN(i);
reg_SOUNDxCNT_VOL(i) = (u8)CalcSurroundDecay(sOrgVolume[i], pan);
}
}
}
static int CalcSurroundDecay(int vol, int pan) {
if (pan < 24) {
return vol * (sSurroundDecay * (pan + 40) + ((0x7FFF - sSurroundDecay) << 6)) >> 21;
} else if (pan <= 104) {
return vol;
} else {
return vol * (-sSurroundDecay * (pan - 40) + ((sSurroundDecay + 0x7FFF) << 6)) >> 21;
}
}
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