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CgbSound is decompiled.

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This commit is contained in:
DizzyEggg 2019-02-01 00:25:31 +01:00
parent d2c17c7fb3
commit 7750a8126d
5 changed files with 359 additions and 607 deletions
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1
Makefile
View File

@ -131,6 +131,7 @@ $(C_BUILDDIR)/agb_flash_1m.o: CFLAGS := -O -mthumb-interwork
$(C_BUILDDIR)/agb_flash_mx.o: CFLAGS := -O -mthumb-interwork
$(C_BUILDDIR)/m4a_2.o: CC1 := tools/agbcc/bin/old_agbcc
$(C_BUILDDIR)/m4a_3.o: CC1 := tools/agbcc/bin/old_agbcc
$(C_BUILDDIR)/m4a_4.o: CC1 := tools/agbcc/bin/old_agbcc
$(C_BUILDDIR)/record_mixing.o: CFLAGS += -ffreestanding

574
asm/m4a_3.s
View File

@ -1,574 +0,0 @@
.include "asm/macros.inc"
.include "constants/gba_constants.inc"
.include "constants/m4a_constants.inc"
.syntax unified
.text
thumb_func_start CgbSound
CgbSound: @ 81DEA70
push {r4-r7,lr}
mov r7, r10
mov r6, r9
mov r5, r8
push {r5-r7}
sub sp, 0x1C
ldr r0, =SOUND_INFO_PTR
ldr r0, [r0]
str r0, [sp, 0x4]
ldrb r0, [r0, 0xA]
cmp r0, 0
beq _081DEA94
subs r0, 0x1
ldr r1, [sp, 0x4]
strb r0, [r1, 0xA]
b _081DEA9A
.pool
_081DEA94:
movs r0, 0xE
ldr r2, [sp, 0x4]
strb r0, [r2, 0xA]
_081DEA9A:
movs r6, 0x1
ldr r0, [sp, 0x4]
ldr r4, [r0, 0x1C]
_081DEAA0:
ldrb r1, [r4]
movs r0, 0xC7
ands r0, r1
adds r2, r6, 0x1
mov r10, r2
movs r2, 0x40
adds r2, r4
mov r9, r2
cmp r0, 0
bne _081DEAB6
b _081DEEA0
_081DEAB6:
cmp r6, 0x2
beq _081DEAE8
cmp r6, 0x2
bgt _081DEAC4
cmp r6, 0x1
beq _081DEACA
b _081DEB20
_081DEAC4:
cmp r6, 0x3
beq _081DEB00
b _081DEB20
_081DEACA:
ldr r0, =REG_NR10
str r0, [sp, 0x8]
ldr r7, =REG_NR11
ldr r2, =REG_NR12
str r2, [sp, 0xC]
adds r0, 0x4
str r0, [sp, 0x10]
adds r2, 0x2
b _081DEB30
.pool
_081DEAE8:
ldr r0, =REG_NR10 + 1
str r0, [sp, 0x8]
ldr r7, =REG_NR21
ldr r2, =REG_NR22
b _081DEB28
.pool
_081DEB00:
ldr r0, =REG_NR30
str r0, [sp, 0x8]
ldr r7, =REG_NR31
ldr r2, =REG_NR32
str r2, [sp, 0xC]
adds r0, 0x4
str r0, [sp, 0x10]
adds r2, 0x2
b _081DEB30
.pool
_081DEB20:
ldr r0, =REG_NR30 + 1
str r0, [sp, 0x8]
ldr r7, =REG_NR41
ldr r2, =REG_NR42
_081DEB28:
str r2, [sp, 0xC]
adds r0, 0xB
str r0, [sp, 0x10]
adds r2, 0x4
_081DEB30:
str r2, [sp, 0x14]
ldr r0, [sp, 0x4]
ldrb r0, [r0, 0xA]
str r0, [sp]
ldr r2, [sp, 0xC]
ldrb r0, [r2]
mov r8, r0
adds r2, r1, 0
movs r0, 0x80
ands r0, r2
cmp r0, 0
beq _081DEC26
movs r3, 0x40
adds r0, r3, 0
ands r0, r2
lsls r0, 24
lsrs r5, r0, 24
adds r0, r6, 0x1
mov r10, r0
movs r1, 0x40
adds r1, r4
mov r9, r1
cmp r5, 0
bne _081DEC4A
movs r0, 0x3
strb r0, [r4]
strb r0, [r4, 0x1D]
adds r0, r4, 0
str r3, [sp, 0x18]
bl CgbModVol
ldr r3, [sp, 0x18]
cmp r6, 0x2
beq _081DEB98
cmp r6, 0x2
bgt _081DEB8C
cmp r6, 0x1
beq _081DEB92
b _081DEBEC
.pool
_081DEB8C:
cmp r6, 0x3
beq _081DEBA4
b _081DEBEC
_081DEB92:
ldrb r0, [r4, 0x1F]
ldr r2, [sp, 0x8]
strb r0, [r2]
_081DEB98:
ldr r0, [r4, 0x24]
lsls r0, 6
ldrb r1, [r4, 0x1E]
adds r0, r1, r0
strb r0, [r7]
b _081DEBF8
_081DEBA4:
ldr r1, [r4, 0x24]
ldr r0, [r4, 0x28]
cmp r1, r0
beq _081DEBCC
ldr r2, [sp, 0x8]
strb r3, [r2]
ldr r1, =REG_WAVE_RAM
ldr r2, [r4, 0x24]
ldr r0, [r2]
str r0, [r1]
adds r1, 0x4
ldr r0, [r2, 0x4]
str r0, [r1]
adds r1, 0x4
ldr r0, [r2, 0x8]
str r0, [r1]
adds r1, 0x4
ldr r0, [r2, 0xC]
str r0, [r1]
str r2, [r4, 0x28]
_081DEBCC:
ldr r0, [sp, 0x8]
strb r5, [r0]
ldrb r0, [r4, 0x1E]
strb r0, [r7]
ldrb r0, [r4, 0x1E]
cmp r0, 0
beq _081DEBE4
movs r0, 0xC0
b _081DEC06
.pool
_081DEBE4:
movs r1, 0x80
negs r1, r1
strb r1, [r4, 0x1A]
b _081DEC08
_081DEBEC:
ldrb r0, [r4, 0x1E]
strb r0, [r7]
ldr r0, [r4, 0x24]
lsls r0, 3
ldr r2, [sp, 0x10]
strb r0, [r2]
_081DEBF8:
ldrb r0, [r4, 0x4]
adds r0, 0x8
mov r8, r0
ldrb r0, [r4, 0x1E]
cmp r0, 0
beq _081DEC06
movs r0, 0x40
_081DEC06:
strb r0, [r4, 0x1A]
_081DEC08:
ldrb r1, [r4, 0x4]
movs r2, 0
strb r1, [r4, 0xB]
movs r0, 0xFF
ands r0, r1
adds r1, r6, 0x1
mov r10, r1
movs r1, 0x40
adds r1, r4
mov r9, r1
cmp r0, 0
bne _081DEC22
b _081DED5E
_081DEC22:
strb r2, [r4, 0x9]
b _081DED8C
_081DEC26:
movs r0, 0x4
ands r0, r2
cmp r0, 0
beq _081DEC58
ldrb r0, [r4, 0xD]
subs r0, 0x1
strb r0, [r4, 0xD]
movs r2, 0xFF
ands r0, r2
lsls r0, 24
adds r1, r6, 0x1
mov r10, r1
movs r2, 0x40
adds r2, r4
mov r9, r2
cmp r0, 0
ble _081DEC4A
b _081DED9E
_081DEC4A:
lsls r0, r6, 24
lsrs r0, 24
bl CgbOscOff
movs r0, 0
strb r0, [r4]
b _081DEE9C
_081DEC58:
movs r0, 0x40
ands r0, r1
adds r2, r6, 0x1
mov r10, r2
movs r2, 0x40
adds r2, r4
mov r9, r2
cmp r0, 0
beq _081DEC98
movs r0, 0x3
ands r0, r1
cmp r0, 0
beq _081DEC98
movs r0, 0xFC
ands r0, r1
movs r2, 0
strb r0, [r4]
ldrb r1, [r4, 0x7]
strb r1, [r4, 0xB]
movs r0, 0xFF
ands r0, r1
cmp r0, 0
beq _081DECCA
movs r0, 0x1
ldrb r1, [r4, 0x1D]
orrs r0, r1
strb r0, [r4, 0x1D]
cmp r6, 0x3
beq _081DED8C
ldrb r2, [r4, 0x7]
mov r8, r2
b _081DED8C
_081DEC98:
ldrb r0, [r4, 0xB]
cmp r0, 0
bne _081DED8C
cmp r6, 0x3
bne _081DECAA
movs r0, 0x1
ldrb r1, [r4, 0x1D]
orrs r0, r1
strb r0, [r4, 0x1D]
_081DECAA:
adds r0, r4, 0
bl CgbModVol
movs r0, 0x3
ldrb r2, [r4]
ands r0, r2
cmp r0, 0
bne _081DECFE
ldrb r0, [r4, 0x9]
subs r0, 0x1
strb r0, [r4, 0x9]
movs r1, 0xFF
ands r0, r1
lsls r0, 24
cmp r0, 0
bgt _081DECFA
_081DECCA:
ldrb r2, [r4, 0xC]
ldrb r1, [r4, 0xA]
adds r0, r2, 0
muls r0, r1
adds r0, 0xFF
asrs r0, 8
movs r1, 0
strb r0, [r4, 0x9]
lsls r0, 24
cmp r0, 0
beq _081DEC4A
movs r0, 0x4
ldrb r2, [r4]
orrs r0, r2
strb r0, [r4]
movs r0, 0x1
ldrb r1, [r4, 0x1D]
orrs r0, r1
strb r0, [r4, 0x1D]
cmp r6, 0x3
beq _081DED9E
movs r2, 0x8
mov r8, r2
b _081DED9E
_081DECFA:
ldrb r0, [r4, 0x7]
b _081DED8A
_081DECFE:
cmp r0, 0x1
bne _081DED0A
_081DED02:
ldrb r0, [r4, 0x19]
strb r0, [r4, 0x9]
movs r0, 0x7
b _081DED8A
_081DED0A:
cmp r0, 0x2
bne _081DED4E
ldrb r0, [r4, 0x9]
subs r0, 0x1
strb r0, [r4, 0x9]
movs r1, 0xFF
ands r0, r1
lsls r0, 24
ldrb r2, [r4, 0x19]
lsls r1, r2, 24
cmp r0, r1
bgt _081DED4A
_081DED22:
ldrb r0, [r4, 0x6]
cmp r0, 0
bne _081DED32
movs r0, 0xFC
ldrb r1, [r4]
ands r0, r1
strb r0, [r4]
b _081DECCA
_081DED32:
ldrb r0, [r4]
subs r0, 0x1
strb r0, [r4]
movs r0, 0x1
ldrb r2, [r4, 0x1D]
orrs r0, r2
strb r0, [r4, 0x1D]
cmp r6, 0x3
beq _081DED02
movs r0, 0x8
mov r8, r0
b _081DED02
_081DED4A:
ldrb r0, [r4, 0x5]
b _081DED8A
_081DED4E:
ldrb r0, [r4, 0x9]
adds r0, 0x1
strb r0, [r4, 0x9]
movs r1, 0xFF
ands r0, r1
ldrb r2, [r4, 0xA]
cmp r0, r2
bcc _081DED88
_081DED5E:
ldrb r0, [r4]
subs r0, 0x1
movs r2, 0
strb r0, [r4]
ldrb r1, [r4, 0x5]
strb r1, [r4, 0xB]
movs r0, 0xFF
ands r0, r1
cmp r0, 0
beq _081DED22
movs r0, 0x1
ldrb r1, [r4, 0x1D]
orrs r0, r1
strb r0, [r4, 0x1D]
ldrb r0, [r4, 0xA]
strb r0, [r4, 0x9]
cmp r6, 0x3
beq _081DED8C
ldrb r2, [r4, 0x5]
mov r8, r2
b _081DED8C
_081DED88:
ldrb r0, [r4, 0x4]
_081DED8A:
strb r0, [r4, 0xB]
_081DED8C:
ldrb r0, [r4, 0xB]
subs r0, 0x1
strb r0, [r4, 0xB]
ldr r0, [sp]
cmp r0, 0
bne _081DED9E
subs r0, 0x1
str r0, [sp]
b _081DEC98
_081DED9E:
movs r0, 0x2
ldrb r1, [r4, 0x1D]
ands r0, r1
cmp r0, 0
beq _081DEE16
cmp r6, 0x3
bgt _081DEDDE
movs r0, 0x8
ldrb r2, [r4, 0x1]
ands r0, r2
cmp r0, 0
beq _081DEDDE
ldr r0, =REG_SOUNDBIAS + 1
ldrb r0, [r0]
cmp r0, 0x3F
bgt _081DEDD0
ldr r0, [r4, 0x20]
adds r0, 0x2
ldr r1, =0x000007fc
b _081DEDDA
.pool
_081DEDD0:
cmp r0, 0x7F
bgt _081DEDDE
ldr r0, [r4, 0x20]
adds r0, 0x1
ldr r1, =0x000007fe
_081DEDDA:
ands r0, r1
str r0, [r4, 0x20]
_081DEDDE:
cmp r6, 0x4
beq _081DEDF0
ldr r0, [r4, 0x20]
ldr r1, [sp, 0x10]
strb r0, [r1]
b _081DEDFE
.pool
_081DEDF0:
ldr r2, [sp, 0x10]
ldrb r0, [r2]
movs r1, 0x8
ands r1, r0
ldr r0, [r4, 0x20]
orrs r0, r1
strb r0, [r2]
_081DEDFE:
movs r0, 0xC0
ldrb r1, [r4, 0x1A]
ands r0, r1
adds r1, r4, 0
adds r1, 0x21
ldrb r1, [r1]
adds r0, r1, r0
strb r0, [r4, 0x1A]
movs r2, 0xFF
ands r0, r2
ldr r1, [sp, 0x14]
strb r0, [r1]
_081DEE16:
movs r0, 0x1
ldrb r2, [r4, 0x1D]
ands r0, r2
cmp r0, 0
beq _081DEE9C
ldr r1, =REG_NR51
ldrb r0, [r1]
ldrb r2, [r4, 0x1C]
bics r0, r2
ldrb r2, [r4, 0x1B]
orrs r0, r2
strb r0, [r1]
cmp r6, 0x3
bne _081DEE68
ldr r0, =gCgb3Vol
ldrb r1, [r4, 0x9]
adds r0, r1, r0
ldrb r0, [r0]
ldr r2, [sp, 0xC]
strb r0, [r2]
movs r1, 0x80
adds r0, r1, 0
ldrb r2, [r4, 0x1A]
ands r0, r2
cmp r0, 0
beq _081DEE9C
ldr r0, [sp, 0x8]
strb r1, [r0]
ldrb r0, [r4, 0x1A]
ldr r1, [sp, 0x14]
strb r0, [r1]
movs r0, 0x7F
ldrb r2, [r4, 0x1A]
ands r0, r2
strb r0, [r4, 0x1A]
b _081DEE9C
.pool
_081DEE68:
movs r0, 0xF
mov r1, r8
ands r1, r0
mov r8, r1
ldrb r2, [r4, 0x9]
lsls r0, r2, 4
add r0, r8
ldr r1, [sp, 0xC]
strb r0, [r1]
movs r2, 0x80
ldrb r0, [r4, 0x1A]
orrs r0, r2
ldr r1, [sp, 0x14]
strb r0, [r1]
cmp r6, 0x1
bne _081DEE9C
ldr r0, [sp, 0x8]
ldrb r1, [r0]
movs r0, 0x8
ands r0, r1
cmp r0, 0
bne _081DEE9C
ldrb r0, [r4, 0x1A]
orrs r0, r2
ldr r1, [sp, 0x14]
strb r0, [r1]
_081DEE9C:
movs r0, 0
strb r0, [r4, 0x1D]
_081DEEA0:
mov r6, r10
mov r4, r9
cmp r6, 0x4
bgt _081DEEAA
b _081DEAA0
_081DEEAA:
add sp, 0x1C
pop {r3-r5}
mov r8, r3
mov r9, r4
mov r10, r5
pop {r4-r7}
pop {r0}
bx r0
thumb_func_end CgbSound
.align 2, 0 @ Don't pad with nop.

65
include/gba/m4a_internal.h
View File

@ -69,38 +69,38 @@ struct ToneData
struct CgbChannel
{
u8 sf;
u8 ty;
u8 rightVolume;
u8 leftVolume;
u8 at;
u8 de;
u8 su;
u8 re;
u8 ky;
u8 ev;
u8 eg;
u8 ec;
u8 echoVolume;
u8 echoLength;
u8 d1;
u8 d2;
u8 gt;
u8 mk;
u8 ve;
u8 pr;
u8 rp;
u8 d3[3];
u8 d5;
u8 sg;
u8 n4;
u8 pan;
u8 panMask;
u8 mo;
u8 le;
u8 sw;
u32 fr;
u32 wp;
u8 sf; // 0x0
u8 ty; // 0x1
u8 rightVolume; // 0x2
u8 leftVolume; // 0x3
u8 at; // 0x4
u8 de; // 0x5
u8 su; // 0x6
u8 re; // 0x7
u8 ky; // 0x8
u8 ev; // 0x9
u8 eg; // 0xA
u8 ec; // 0xB
u8 echoVolume; // 0xC
u8 echoLength; // 0xD
u8 d1; // 0xE
u8 d2; // 0xF
u8 gt; // 0x10
u8 mk; // 0x11
u8 ve; // 0x12
u8 pr; // 0x13
u8 rp; // 0x14
u8 d3[3]; // 0x15, 0x16, 0x17
u8 d5; // 0x18
u8 sg; // 0x19
u8 n4; // 0x1A
u8 pan; // 0x1B
u8 panMask; // 0x1C
u8 mo; // 0x1D
u8 le; // 0x1E
u8 sw; // 0x1F
u32 fr; // 0x20
u32 *wp;
u32 cp;
u32 tp;
u32 pp;
@ -397,6 +397,7 @@ void m4aSoundMode(u32 mode);
void MPlayOpen(struct MusicPlayerInfo *mplayInfo, struct MusicPlayerTrack *track, u8 a3);
void CgbSound(void);
void CgbOscOff(u8);
void CgbModVol(struct CgbChannel *chan);
u32 MidiKeyToCgbFreq(u8, u8, u8);
void DummyFunc(void);
void MPlayJumpTableCopy(void **mplayJumpTable);

2
ld_script.txt
View File

@ -320,7 +320,7 @@ SECTIONS {
asm/libgcnmultiboot.o(.text);
asm/m4a_1.o(.text);
src/m4a_2.o(.text);
asm/m4a_3.o(.text);
src/m4a_3.o(.text);
src/m4a_4.o(.text);
src/agb_flash.o(.text);
src/agb_flash_1m.o(.text);

324
src/m4a_3.c Normal file
View File

@ -0,0 +1,324 @@
#include "gba/m4a_internal.h"
extern const u8 gCgb3Vol[];
void CgbSound(void)
{
s32 ch;
struct CgbChannel *channels;
s32 evAdd;
s32 prevC15;
struct SoundInfo *soundInfo = SOUND_INFO_PTR;
vu8 *nrx0ptr;
vu8 *nrx1ptr;
vu8 *nrx2ptr;
vu8 *nrx3ptr;
vu8 *nrx4ptr;
// Most comparision operations that cast to s8 perform 'and' by 0xFF.
int xFF = 0xff;
if (soundInfo->c15)
soundInfo->c15--;
else
soundInfo->c15 = 14;
for (ch = 1, channels = soundInfo->cgbChans; ch <= 4; ch++, channels++)
{
if (!(channels->sf & 0xc7))
continue;
switch (ch)
{
case 1:
nrx0ptr = (vu8 *)(REG_ADDR_NR10);
nrx1ptr = (vu8 *)(REG_ADDR_NR11);
nrx2ptr = (vu8 *)(REG_ADDR_NR12);
nrx3ptr = (vu8 *)(REG_ADDR_NR13);
nrx4ptr = (vu8 *)(REG_ADDR_NR14);
break;
case 2:
nrx0ptr = (vu8 *)(REG_ADDR_NR10+1);
nrx1ptr = (vu8 *)(REG_ADDR_NR21);
nrx2ptr = (vu8 *)(REG_ADDR_NR22);
nrx3ptr = (vu8 *)(REG_ADDR_NR23);
nrx4ptr = (vu8 *)(REG_ADDR_NR24);
break;
case 3:
nrx0ptr = (vu8 *)(REG_ADDR_NR30);
nrx1ptr = (vu8 *)(REG_ADDR_NR31);
nrx2ptr = (vu8 *)(REG_ADDR_NR32);
nrx3ptr = (vu8 *)(REG_ADDR_NR33);
nrx4ptr = (vu8 *)(REG_ADDR_NR34);
break;
default:
nrx0ptr = (vu8 *)(REG_ADDR_NR30+1);
nrx1ptr = (vu8 *)(REG_ADDR_NR41);
nrx2ptr = (vu8 *)(REG_ADDR_NR42);
nrx3ptr = (vu8 *)(REG_ADDR_NR43);
nrx4ptr = (vu8 *)(REG_ADDR_NR44);
break;
}
prevC15 = soundInfo->c15;
evAdd = *nrx2ptr;
if (channels->sf & 0x80)
{
if (!(channels->sf & 0x40))
{
channels->sf = 3;
channels->mo = 3;
CgbModVol(channels);
switch (ch)
{
case 1:
*nrx0ptr = channels->sw;
// fallthrough
case 2:
*nrx1ptr = ((u32)channels->wp << 6) + channels->le;
goto loc_82E0E30;
break;
case 3:
if ((u32)channels->wp != channels->cp)
{
*nrx0ptr = 0x40;
REG_WAVE_RAM0 = channels->wp[0];
REG_WAVE_RAM1 = channels->wp[1];
REG_WAVE_RAM2 = channels->wp[2];
REG_WAVE_RAM3 = channels->wp[3];
channels->cp = (u32)channels->wp;
}
*nrx0ptr = 0;
*nrx1ptr = channels->le;
if (channels->le)
channels->n4 = -64;
else
channels->n4 = -128;
break;
default:
*nrx1ptr = channels->le;
*nrx3ptr = (u32)channels->wp << 3;
loc_82E0E30:
evAdd = channels->at + 8;
if (channels->le)
channels->n4 = 64;
else
channels->n4 = 0;
break;
}
channels->ec = channels->at;
if ((s8)(channels->at & xFF))
{
channels->ev = 0;
goto EC_MINUS;
}
else
{
goto loc_82E0F96;
}
}
else
{
goto loc_82E0E82;
}
}
else if (channels->sf & 0x04)
{
channels->echoLength--;
if ((s8)(channels->echoLength & xFF) <= 0)
{
loc_82E0E82:
CgbOscOff(ch);
channels->sf = 0;
goto LAST_LABEL;
}
goto loc_82E0FD6;
}
else if ((channels->sf & 0x40) && (channels->sf & 0x03))
{
channels->sf &= 0xfc;
channels->ec = channels->re;
if ((s8)(channels->re & xFF))
{
channels->mo |= 1;
if (ch != 3)
{
evAdd = channels->re;
}
goto EC_MINUS;
}
else
{
goto loc_82E0F02;
}
}
else
{
loc_82E0ED0:
if (channels->ec == 0)
{
if (ch == 3)
{
channels->mo |= 1;
}
CgbModVol(channels);
if ((channels->sf & 0x3) == 0)
{
channels->ev--;
if ((s8)(channels->ev & xFF) <= 0)
{
loc_82E0F02:
channels->ev = ((channels->eg * channels->echoVolume) + 0xFF) >> 8;
if (channels->ev)
{
channels->sf |= 0x4;
channels->mo |= 1;
if (ch != 3)
{
evAdd = 8;
}
goto loc_82E0FD6;
}
else
{
goto loc_82E0E82;
}
}
else
{
channels->ec = channels->re;
}
}
else if ((channels->sf & 0x3) == 1)
{
loc_82E0F3A:
channels->ev = channels->sg;
channels->ec = 7;
}
else if ((channels->sf & 0x3) == 2)
{
int ev, sg;
channels->ev--;
ev = (s8)(channels->ev & xFF);
sg = (s8)(channels->sg);
if (ev <= sg)
{
loc_82E0F5A:
if (channels->su == 0)
{
channels->sf &= 0xfc;
goto loc_82E0F02;
}
else
{
channels->sf--;
channels->mo |= 1;
if (ch != 3)
{
evAdd = 8;
}
goto loc_82E0F3A;
}
}
else
{
channels->ec = channels->de;
}
}
else
{
channels->ev++;
if ((u8)(channels->ev & xFF) >= channels->eg)
{
loc_82E0F96:
channels->sf--;
channels->ec = channels->de;
if ((u8)(channels->ec & xFF))
{
channels->mo |= 1;
channels->ev = channels->eg;
if (ch != 3)
{
evAdd = channels->de;
}
}
else
{
goto loc_82E0F5A;
}
}
else
{
channels->ec = channels->at;
}
}
}
}
EC_MINUS:
channels->ec--;
if (prevC15 == 0)
{
prevC15--;
goto loc_82E0ED0;
}
loc_82E0FD6:
if (channels->mo & 0x2)
{
if (ch < 4 && (channels->ty & 0x08))
{
int biasH = REG_SOUNDBIAS_H;
if (biasH < 64)
{
channels->fr = (channels->fr + 2) & 0x7fc;
}
else if (biasH < 128)
{
channels->fr = (channels->fr + 1) & 0x7fe;
}
}
if (ch != 4)
{
*nrx3ptr = channels->fr;
}
else
{
*nrx3ptr = (*nrx3ptr & 0x08) | channels->fr;
}
channels->n4 = (channels->n4 & 0xC0) + (*((u8*)(&channels->fr) + 1));
*nrx4ptr = (s8)(channels->n4 & xFF);
}
if (channels->mo & 1)
{
REG_NR51 = (REG_NR51 & ~channels->panMask) | channels->pan;
if (ch == 3)
{
*nrx2ptr = gCgb3Vol[channels->ev];
if (channels->n4 & 0x80)
{
*nrx0ptr = 0x80;
*nrx4ptr = channels->n4;
channels->n4 &= 0x7f;
}
}
else
{
evAdd &= 0xf;
*nrx2ptr = (channels->ev << 4) + evAdd;
*nrx4ptr = channels->n4 | 0x80;
if (ch == 1 && !(*nrx0ptr & 0x08))
{
*nrx4ptr = channels->n4 | 0x80;
}
}
}
LAST_LABEL:
channels->mo = 0;
}
}