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Zelda UCode: Synth fixes and some RE. (Why does it still sound awful?)

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git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@3707 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
XTra.KrazzY
2009-07-08 01:08:43 +00:00
parent 47ea4936b3
commit 25b77d4654
4 changed files with 69 additions and 29 deletions
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68
docs/DSP/DSP_UC_Zelda.txt
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@ -2876,27 +2876,37 @@ void 07eb_AFCDecoder(_numberOfSample(AC0.M))
//////////////////////////////////////////// DEFAULT DECODER
void 087c_DefaultDecoder()
{
087c 8100 clr $ACC0
087c 8100 clr $ACC0 // ACC0 = 0
087d 1f5e mrr $AX0.H, $AC0.M
087e 00d8 0402 lr $AX0.L, @0x0402 // AX0.L = PB.RatioInt
// 087c 8100 clr $ACC0
// 087d 1f5e mrr $AX0.H, $AC0.M
// 087e 00d8 0402 lr $AX0.L, @0x0402
ACC0 = 0;
AX0.L = *0x0402; // == PB.RatioInt
// Sample fraction is stored in a common way, but sample position is not, so
// it's in the individual decoders. Some decoders, like square wave, only care about
// fractional sample position. So here we just load up the fractional sample
// position before handing control over.
0880 00dc 0430 lr $AC0.L, @0x0430 // AC0.L = PB.CurSampleFrac
0882 0080 0520 lri $AR0, #0x0520 // AR0 = 0x0520
// 0880 00dc 0430 lr $AC0.L, @0x0430
// 0882 0080 0520 lri $AR0, #0x0520
AC0.L = *0x430; // == PB.CurSampleFrac
AR0 = 0x0520;
// 0884 00df 0480 lr $AC1.M, @0x0480
// 0886 1501 lsl $ACC1, #1 // AC1.M = (PB.Format << 1)
// 0887 0340 007e andi $AC1.M, #0x007e // AC1.M &= 0x007e
// 0889 0300 0891 addi $AC1.M, #0x0891 // AC1.M += 0x0891
// 088b 1c5f mrr $AR2, $AC1.M // AR2 = AC1.M
// 0886 1501 lsl $ACC1, #1
// 0887 0340 007e andi $AC1.M, #0x007e
// 0889 0300 0891 addi $AC1.M, #0x0891
// 088b 1c5f mrr $AR2, $AC1.M
// 088c 175f callr $AR2 // (*$AR2)() <-- See jump table at 0x0891
AC1.M = ((*0x480 * 2) & 0x007e) + 0x0891; // == ((PB.Format * 2) & 0x007e) + 0x0891
AR2 = AC1.M;
JumpTable0891(PB.Format);
088d 00fc 0430 sr @0x0430, $AC0.L // PB.CurSampleFrac = AC0.L
//088d 00fc 0430 sr @0x0430, $AC0.L
*0x430 = AC0.L; // *0x430 == PB.CurSampleFrac
// 088f 029f 02d8 jmp 0x02d8
GOTO ContinueWithBlock: // in SyncFrame
@ -2923,7 +2933,7 @@ void 087c_DefaultDecoder()
08af 029f 08b1 jmp 0x08b1 // case 0xf (unused)
08b1 02df ret
void 08b2_Decoder0x0_SquareWave() {
void 08b2_Decoder0x0_SquareWave(ACC0, AR0, AX0.L) {
08b2 1401 lsl $ACC0, #1 // t = samplePosition * 2
// Set up sound buffers
@ -2949,7 +2959,7 @@ void 08b2_Decoder0x0_SquareWave() {
// 08c1 02df ret
}
void 08c2_Decoder0x3_RectangleWave() {
void 08c2_Decoder0x3_RectangleWave(ACC0, AR0, AX0.L) {
08c2 1402 lsl $ACC0, #2 // t = PB.CurSampleFrac * 4
08c3 8900 clr $ACC1 // ACC1 = 0
08c4 1fb8 mrr $AC1.L, $AX0.L // AC1.L = PB.RatioInt
@ -2976,7 +2986,7 @@ void 08c2_Decoder0x3_RectangleWave() {
// 08d4 02df ret
}
void 08d5_Decoder0x2_SquareSaw() {
void 08d5_Decoder0x2_SquareSaw(ACC0, AR0, AX0.L) {
08d5 1401 lsl $ACC0, #1
08d6 0081 0ca0 lri $AR1, #0x0ca0
08d8 009b c000 lri $AX1.H, #0xc000
@ -2997,12 +3007,24 @@ void 08d5_Decoder0x2_SquareSaw() {
// 08ec 02df ret
}
void 08ed_Decoder0x1_SawWave() {
08ed 8900 clr $ACC1
08ee 1fb8 mrr $AC1.L, $AX0.L
08ef 157f lsr $ACC1, #-1
08f0 1050 loopi #0x50
08f1 4c20 add's $ACC0, $AC1.L : @$AR0, $AC0.L
void 08ed_Decoder0x1_SawWave(ACC0, AR0, AX0.L) {
// 08ed 8900 clr $ACC1
// 08ee 1fb8 mrr $AC1.L, $AX0.L
// 08ef 157f lsr $ACC1, #-1
// At this point AX0.L is PB.RatioInt and AC0.L is PB.CurSampleFrac
ACC1 = 0;
AC1.L = AX0.L * 2;
// 08f0 1050 loopi #0x50
for(int i = 0; i < 0x50; i++) {
// 08f1 4c20 add's $ACC0, $AC1.L : @$AR0, $AC0.L
ACC0 += AC1.L;
*$AR0++ = AC0.L;
}
// 08f2 02df ret
}
@ -3038,7 +3060,7 @@ void 08f3_Unk() {
// 0918 02df ret
}
void 0919_Decoder0x6() {
void 0919_Decoder0x6(AR0, AX0.L) {
// case 0x6: Fills the buffer with PB.RatioInt (zero?)
0919 1050 loopi #0x50
@ -3046,7 +3068,7 @@ void 0919_Decoder0x6() {
091b 02df ret
}
void 091c_Decoder0x7_WaveTable() {
void 091c_Decoder0x7_WaveTable(ACC0, AR0, AX0.L) {
091c 0082 0100 lri $AR2, #0x0100
091e 008a 003f lri $WR2, #0x003f
0920 0086 0000 lri $IX2, #0x0000