Linear Attack Tile Calculation

Linear Attack Tile Calculation

0017c044: 34020002 ori r2,r0,0x0002
0017c048: 10820010 beq r4,r2,0x0017c08c		Branch if Direction = 2
0017c04c: 28820003 slti r2,r4,0x0003
0017c050: 10400005 beq r2,r0,0x0017c068		Branch if Direction >= 3
0017c054: 00000000 nop
0017c058: 1080000a beq r4,r0,0x0017c084		Branch if Direction = 0
0017c05c: 34090001 ori r9,r0,0x0001		X Mod = 1

• Direction = 1*

0017c060: 0805f054 j 0x0017c150			(quit)
0017c064: 00000000 nop
0017c068: 34020004 ori r2,r0,0x0004
0017c06c: 1082000c beq r4,r2,0x0017c0a0		Branch if Direction = 4
0017c070: 34020006 ori r2,r0,0x0006
0017c074: 10820008 beq r4,r2,0x0017c098		Branch if Direction = 6
0017c078: 00004821 addu r9,r0,r0		X Mod = 0

• Direction = 3 or 5*

0017c07c: 0805f054 j 0x0017c150			(quit)
0017c080: 00000000 nop

• Direction = 0*

0017c084: 0805f02a j 0x0017c0a8
0017c088: 00004021 addu r8,r0,r0		Y Mod = 0; X Mod = 1

• Direction = 2*

0017c08c: 2409ffff addiu r9,r0,0xffff		X Mod = -1
0017c090: 0805f02a j 0x0017c0a8
0017c094: 00004021 addu r8,r0,r0		Y Mod = 0

• Direction = 6*

0017c098: 0805f02a j 0x0017c0a8
0017c09c: 34080001 ori r8,r0,0x0001		Y Mod = 1; X Mod = 0

• Direction = 4*

0017c0a0: 00004821 addu r9,r0,r0		X Mod = 0
0017c0a4: 2408ffff addiu r8,r0,0xffff		Y Mod = -1
0017c0a8: 00003821 addu r7,r0,r0		Counter = 0
0017c0ac: 3c0b8019 lui r11,0x8019
0017c0b0: 256b2dd8 addiu r11,r11,0x2dd8		r11 = ? Tile Data Pointer
0017c0b4: 340a0001 ori r10,r0,0x0001		r10 = 1
0017c0b8: 04a00025 bltz r5,0x0017c150		Branch if X is negative
0017c0bc: 00000000 nop
0017c0c0: 3c03800e lui r3,0x800e
0017c0c4: 90634e9c lbu r3,0x4e9c(r3)		Load Map Max X
0017c0c8: 00000000 nop
0017c0cc: 00a3102a slt r2,r5,r3
0017c0d0: 1040001f beq r2,r0,0x0017c150		Branch if X >= Max X
0017c0d4: 00000000 nop
0017c0d8: 04c0001d bltz r6,0x0017c150		Branch if Y is negative
0017c0dc: 00000000 nop
0017c0e0: 3c02800e lui r2,0x800e
0017c0e4: 90424ea0 lbu r2,0x4ea0(r2)		Load Map Max Y
0017c0e8: 00000000 nop
0017c0ec: 00c2102a slt r2,r6,r2
0017c0f0: 10400017 beq r2,r0,0x0017c150		Branch if Y >= Max Y
0017c0f4: 00c30018 mult r6,r3			Y * Max X
0017c0f8: 00001012 mflo r2
0017c0fc: 00452021 addu r4,r2,r5		Tile ID = Y * Max X + X
0017c100: 00041080 sll r2,r4,0x02		ID * 4
0017c104: 00441021 addu r2,r2,r4		ID * 5
0017c108: 004b1821 addu r3,r2,r11
0017c10c: 90620000 lbu r2,0x0000(r3)		Load Low Tile's AoE
0017c110: 00000000 nop
0017c114: 10400002 beq r2,r0,0x0017c120		Branch if Low AoE = 0
0017c118: 24840100 addiu r4,r4,0x0100		Tile ID + 0x100
0017c11c: a06a0001 sb r10,0x0001(r3)		Store Tile Targeted? = True
0017c120: 00041080 sll r2,r4,0x02		ID * 4
0017c124: 00441021 addu r2,r2,r4		ID * 5
0017c128: 004b1821 addu r3,r2,r11
0017c12c: 90620000 lbu r2,0x0000(r3)		Load High Tile's AoE
0017c130: 00000000 nop
0017c134: 10400002 beq r2,r0,0x0017c140		Branch if High AoE = 0
0017c138: 00c83021 addu r6,r6,r8		Y += Y Mod
0017c13c: a06a0001 sb r10,0x0001(r3)		Store Tile Targeted? = True
0017c140: 24e70001 addiu r7,r7,0x0001		Counter ++
0017c144: 28e20020 slti r2,r7,0x0020
0017c148: 1440ffdb bne r2,r0,0x0017c0b8		Branch if Counter < 0x20
0017c14c: 00a92821 addu r5,r5,r9		X += X Mod
0017c150: 03e00008 jr r31
0017c154: 00000000 nop