001a5ea4 - 001a600c

effect vector matrix routine?

001a5ea4: 27bdffd0 addiu r29,r29,0xffd0
001a5ea8: afb00028 sw r16,0x0028(r29)
001a5eac: 00a08021 addu r16,r5,r0			r5 is... I dunno. way outside the bounds of any known table - but also not a stack pointer?
001a5eb0: afbf002c sw r31,0x002c(r29)
001a5eb4: 8e02000c lw r2,0x000c(r16)
001a5eb8: 8e030054 lw r3,0x0054(r16)			r3 = current effect parameter pointer
001a5ebc: 00021303 sra r2,r2,0x0c
001a5ec0: a462000c sh r2,0x000c(r3)			Store XX
001a5ec4: 8e020010 lw r2,0x0010(r16)
001a5ec8: 8e030054 lw r3,0x0054(r16)			r3 = current effect parameter pointer
001a5ecc: 00021303 sra r2,r2,0x0c
001a5ed0: a462000e sh r2,0x000e(r3)			Store YY
001a5ed4: 8e020014 lw r2,0x0014(r16)
001a5ed8: 8e030054 lw r3,0x0054(r16)			r3 = current effect parameter pointer. again. Christ 3 times?
001a5edc: 00021303 sra r2,r2,0x0c
001a5ee0: a4620010 sh r2,0x0010(r3)			Store ZZ
001a5ee4: 9602004c lhu r2,0x004c(r16)
001a5ee8: 00000000 nop
001a5eec: 30420002 andi r2,r2,0x0002			check for flag 2
001a5ef0: 1040001d beq r2,r0,0x001a5f68		branch if flag 2 doesn't exist (don't translate from map plane to projection on screen? (or vice versa?))
001a5ef4: 00000000 nop
001a5ef8: 3c04800a lui r4,0x800a
001a5efc: 24848a24 addiu r4,r4,0x8a24			0x80098a24 (Rotation matrix vector pointer?)
001a5f00: 0c00742a jal 0x0001d0a8			Store Rotation matrix elements to GTE return MX
001a5f04: 00000000 nop
001a5f08: 3c04801c lui r4,0x801c
001a5f0c: 24848a0c addiu r4,r4,0x8a0c			0x801b8a0c (translation vector pointer?)
001a5f10: 0c00744e jal 0x0001d138			Store Translation Vectors to GTE return CV (bets on the acronym here being "camera vector" which is never explained.)
001a5f14: 00000000 nop
001a5f18: 8e020018 lw r2,0x0018(r16)			load Vector X
001a5f1c: 27a40010 addiu r4,r29,0x0010			pointer to vector x (0x10, half) y (0x12, half) and z (0x14, word)
001a5f20: 000210c3 sra r2,r2,0x03
001a5f24: a7a20010 sh r2,0x0010(r29)			store vector X
001a5f28: 8e02001c lw r2,0x001c(r16)			load Vector Y
001a5f2c: 27a50018 addiu r5,r29,0x0018			return value pointer = sp + 0x18
001a5f30: 000210c3 sra r2,r2,0x03			vector Y / 8
001a5f34: a7a20012 sh r2,0x0012(r29)			store vector Y
001a5f38: 8e020020 lw r2,0x0020(r16)			load Vector Z (word)
001a5f3c: 27a60024 addiu r6,r29,0x0024			return value pointer = sp + 0x24
001a5f40: 000210c3 sra r2,r2,0x03			Z / 8
001a5f44: 0c00755e jal 0x0001d578			Get vector*matrix from GTE return CV + ([x;y;z] * MX)
001a5f48: a7a20014 sh r2,0x0014(r29)			store vector Z
001a5f4c: 8fa4001c lw r4,0x001c(r29)			ΔY
001a5f50: 8fa50018 lw r5,0x0018(r29)			ΔX
001a5f54: 0c00763a jal 0x0001d8e8			Get Angle Value via ArcTan Table Atan(r4/r5)
001a5f58: 00000000 nop
001a5f5c: 8e030054 lw r3,0x0054(r16)			load effect parameter pointer
001a5f60: 00000000 nop
001a5f64: a4620012 sh r2,0x0012(r3)			store angle between units at 0x12
001a5f68: 9602004e lhu r2,0x004e(r16)			?
001a5f6c: 00000000 nop
001a5f70: 30420040 andi r2,r2,0x0040			check for 0x40 flag
001a5f74: 1040001c beq r2,r0,0x001a5fe8		branch if no 0x40 flag
001a5f78: 34050080 ori r5,r0,0x0080			r5 = 0x80
001a5f7c: 92030046 lbu r3,0x0046(r16)			math transform function?
001a5f80: 8e040054 lw r4,0x0054(r16)			r4 = current effect parameter pointer
001a5f84: 3c07801c lui r7,0x801c
001a5f88: 8ce7bf7c lw r7,-0x4084(r7)			0x801cbf7c (effect math transformation on input value?)
001a5f8c: 86080050 lh r8,0x0050(r16)			math input?
001a5f90: 00031080 sll r2,r3,0x02			
001a5f94: 00431021 addu r2,r2,r3
001a5f98: 00021140 sll r2,r2,0x05			table length is 0xA0 per entry
001a5f9c: 00471021 addu r2,r2,r7			points to math transform table of function
001a5fa0: 00481021 addu r2,r2,r8			+ r8
001a5fa4: 92030047 lbu r3,0x0047(r16)			second function set...?
001a5fa8: 90450004 lbu r5,0x0004(r2)			+ r8 + 4 (loads function(input))
001a5fac: 00031080 sll r2,r3,0x02
001a5fb0: 00431021 addu r2,r2,r3
001a5fb4: 00021140 sll r2,r2,0x05			0xA0 per entry
001a5fb8: 00471021 addu r2,r2,r7
001a5fbc: 00481021 addu r2,r2,r8
001a5fc0: 92030048 lbu r3,0x0048(r16)			third function set?
001a5fc4: 90460004 lbu r6,0x0004(r2)			Loads function_2(input)
001a5fc8: 00031080 sll r2,r3,0x02
001a5fcc: 00431021 addu r2,r2,r3
001a5fd0: 00021140 sll r2,r2,0x05
001a5fd4: 00471021 addu r2,r2,r7
001a5fd8: 00481021 addu r2,r2,r8
001a5fdc: 90470004 lbu r7,0x0004(r2)			Loads function_3(input)
001a5fe0: 080697fd j 0x001a5ff4			
001a5fe4: 00000000 nop
001a5fe8: 8e040054 lw r4,0x0054(r16)			load parameter data pointer from r16
001a5fec: 34060080 ori r6,r0,0x0080			p3 = 0x80
001a5ff0: 34070080 ori r7,r0,0x0080			p4 = 0x80
001a5ff4: 0c06a87e jal 0x001aa1f8			Composite frame loading for parameter sets
001a5ff8: 00000000 nop
001a5ffc: 8fbf002c lw r31,0x002c(r29)
001a6000: 8fb00028 lw r16,0x0028(r29)
001a6004: 27bd0030 addiu r29,r29,0x0030
001a6008: 03e00008 jr r31
001a600c: 00000000 nop