Map Location Calculation

Map Location Calculation (requires r4 = Target Data Pointer)
001810a0: 90830048 lbu r3,0x0048(r4)		Target Y Coordinate
001810a4: 3c02800e lui r2,0x800e
001810a8: 90424e9c lbu r2,0x4e9c(r2)		Map Max X Coordinate
001810ac: 00000000 nop
001810b0: 00620018 mult r3,r2			Y  * Max X
001810b4: 94820048 lhu r2,0x0048(r4)		Y Coordinate + Elevation/Facing Flags
001810b8: 90840047 lbu r4,0x0047(r4)		X Coordinate
001810bc: 000213c2 srl r2,r2,0x0f		Checks for Higher Elevation
001810c0: 00021200 sll r2,r2,0x08		r2 = 0 or 256 (if at a Higher  Elevation)
001810c4: 00001812 mflo r3
001810c8: 00431021 addu r2,r2,r3		Y * Max X + 0 or 256
001810cc: 03e00008 jr r31
001810d0: 00441021 addu r2,r2,r4		r2 = X + Y * Max X + 0 or 256 (Target's Tile ID)