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Decoded the non-externalops part of 0x0007 zelda sound case

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git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@4287 8ced0084-cf51-0410-be5f-012b33b47a6e
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XTra.KrazzY 2009-09-16 22:40:43 +00:00
parent 2eece4c2f4
commit 4edf1ea837
1 changed files with 52 additions and 20 deletions
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72
docs/DSP/DSP_UC_Zelda.txt
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@ -3209,29 +3209,61 @@ void 0919_Decoder0x6_Constant(AR0, AX0.L) {
}
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
0922 1406 lsl $ACC0, #6
0923 8900 clr $ACC1
0924 1fb8 mrr $AC1.L, $AX0.L
0925 1505 lsl $ACC1, #5
0926 009b 003f lri $AX1.H, #0x003f
0928 009a 0000 lri $AX0.H, #0x0000
092a 3600 andr $AC0.M, $AX1.H
092b 1cde mrr $IX2, $AC0.M
092c 001a addarn $AR2, $IX2
092d 3400 andr $AC0.M, $AX0.H
092e 1150 0934 bloopi #0x50, 0x0934
// So AR2 is where it reads the data from, and it updates ACC0 to the final read address in the end
// Questions: What is IX2 used for? And how does the wrap register change the data access?
// 091c 0082 0100 lri $AR2, #0x0100
// 091e 008a 003f lri $WR2, #0x003f
// 0920 0086 0000 lri $IX2, #0x0000
// 0922 1406 lsl $ACC0, #6
// 0923 8900 clr $ACC1
// 0924 1fb8 mrr $AC1.L, $AX0.L
// 0925 1505 lsl $ACC1, #5
WR2 = 0x003f;
ACC0 <<= 6;
ACC1 = AX0.L << 5;
// 0926 009b 003f lri $AX1.H, #0x003f
// 0928 009a 0000 lri $AX0.H, #0x0000
// 092a 3600 andr $AC0.M, $AX1.H
// 092b 1cde mrr $IX2, $AC0.M
// 092c 001a addarn $AR2, $IX2
// 092d 3400 andr $AC0.M, $AX0.H
AC0.M &= 0x003f;
IX2 = AC0.M;
AR2 += 0x0100 + IX2;
AC0.M = 0;
// 092e 1150 0934 bloopi #0x50, 0x0934
for(int i = 0; i < 0x50; i++) {
0930 4c4a add'l $ACC0, $ACC1 : $AX1.L, @$AR2
0931 3606 andr'dr $AC0.M, $AX1.H : $AR2
0932 1cde mrr $IX2, $AC0.M
// 0932 1cde mrr $IX2, $AC0.M
IX2 = AC0.M;
0933 340e andr'nr $AC0.M, $AX0.H : $AR2
0934 1b19 srri @$AR0, $AX1.L
0935 1fc2 mrr $AC0.M, $AR2
0936 147a lsr $ACC0, #-6
0937 008a ffff lri $WR2, #0xffff
0939 02df ret
// 0934 1b19 srri @$AR0, $AX1.L
*AR0++ = AX1.L
}
// 0935 1fc2 mrr $AC0.M, $AR2
// 0936 147a lsr $ACC0, #-6
// 0937 008a ffff lri $WR2, #0xffff
AC0.M = AR2;
ACC0 >>= 6;
WR2 = 0xffff;
// 0939 02df ret
}
void 093a_Unk() {