001af3a4 - 001af3d8
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Little math routine dedicated to arcing weapon trajectory Parameters : r4 = (Attacker to target distance)*4096 = [AT distance]*4096 Returns : r2 = 0x54000 - ([AT distance]² *4096/336) ------------------------------------------------------------------------------------------- 001af3a4: 00042183 sra r4,r4,0x06 |r4 = [AT distance]*64 001af3a8: 00840018 mult r4,r4 | ([AT distance]*64)^2 001af3ac: 3c03801c lui r3,0x801c |r3 = 0x801c0000 001af3b0: 8c638878 lw r3,-0x7788(r3) |r3 = gravity mod ? 0xa8000 (12*28*2048) Higher value send arrow in the sky, but less far 001af3b4: 00001012 mflo r2 |r2 = [AT distance]² * 4096 001af3b8: 000322c3 sra r4,r3,0x0b |r4 = 0xa8000 / 2048 = 12*28 001af3bc: 00000000 nop | 001af3c0: 0044001a div r2,r4 |[AT distance]²* 4096 / 336 001af3c4: 00001012 mflo r2 |r2 = [AT distance]² * 4096 / 336 001af3c8: 000327c2 srl r4,r3,0x1f |r4 = r3/ 2^31 = 0x00 001af3cc: 00641821 addu r3,r3,r4 |r3 = gravity mod + 0x00 001af3d0: 00031843 sra r3,r3,0x01 |r2 = gravity mod / 2 (0x54000) 001af3d4: 03e00008 jr r31 | 001af3d8: 00621023 subu r2,r3,r2 |r2 = 0x54000 - ([AT distance]² *4096/336) = ([AT distance]² *12 ?) a height ?
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uses 0x801b8878 flagged as gravity mod ( 801b8878 )
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Battle.bin 001af434: Maths_For_Arcing_Trajectory SCUS None
