Difference between revisions of "Move find item flag calculation"
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001804d8: 00852021 addu r4,r4,r5 #r4 = current MFI number (0-3: map 1's MFI 1-4; 4-7: map 2's MFI 1-4) | 001804d8: 00852021 addu r4,r4,r5 #r4 = current MFI number (0-3: map 1's MFI 1-4; 4-7: map 2's MFI 1-4) | ||
001804dc: 34020080 ori r2,r0,0x0080 | 001804dc: 34020080 ori r2,r0,0x0080 | ||
| − | 001804e0: 10c0000b beq r6,r0,0x00180510 | + | 001804e0: 10c0000b beq r6,r0,0x00180510 #branch if checking flags instead of saving |
001804e4: 00822007 srav r4,r2,r4 #r4 = 0x80 sra current MFI number = current MFI found item flag | 001804e4: 00822007 srav r4,r2,r4 #r4 = 0x80 sra current MFI number = current MFI found item flag | ||
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00180500: 00270821 addu r1,r1,r7 | 00180500: 00270821 addu r1,r1,r7 | ||
00180504: a0239414 sb r3,-0x6bec(r1) #store updated move find item flags for these maps | 00180504: a0239414 sb r3,-0x6bec(r1) #store updated move find item flags for these maps | ||
| − | 00180508: 0806014a j 0x00180528 | + | 00180508: 0806014a j 0x00180528 #jump to End |
0018050c: 34020001 ori r2,r0,0x0001 #return r2 = 1 | 0018050c: 34020001 ori r2,r0,0x0001 #return r2 = 1 | ||
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00180518: 90229414 lbu r2,-0x6bec(r1) #load move find item flags | 00180518: 90229414 lbu r2,-0x6bec(r1) #load move find item flags | ||
0018051c: 00000000 nop | 0018051c: 00000000 nop | ||
| − | 00180520: 00441024 and r2,r2,r4 | + | 00180520: 00441024 and r2,r2,r4 #compare map flags with updated flag |
00180524: 2c420001 sltiu r2,r2,0x0001 #0x00 = item already found. 0x01 = item never found before | 00180524: 2c420001 sltiu r2,r2,0x0001 #0x00 = item already found. 0x01 = item never found before | ||
Latest revision as of 23:33, 9 August 2025
#Parameters:
#r4 = map ID
#r5 = current MFI tile (0-3)
#r6 = check type
0 = checking found item flags
1 = saving updated found item flags
#Returns:
#r2 = activation outcome
0 = no item found or no trap activated
1 = item found or trap activated
001804c4: 000417c2 srl r2,r4,0x1f #checking if map ID was negative? waste of a line
001804c8: 00821021 addu r2,r4,r2 #r2 = map ID
001804cc: 00023843 sra r7,r2,0x01 #r7 = (map ID) / 2 ?
001804d0: 30840001 andi r4,r4,0x0001 #r4 = 0x01 if map ID was an odd number
001804d4: 00042080 sll r4,r4,0x02 #r4 = 0x04 if map ID was an odd number
001804d8: 00852021 addu r4,r4,r5 #r4 = current MFI number (0-3: map 1's MFI 1-4; 4-7: map 2's MFI 1-4)
001804dc: 34020080 ori r2,r0,0x0080
001804e0: 10c0000b beq r6,r0,0x00180510 #branch if checking flags instead of saving
001804e4: 00822007 srav r4,r2,r4 #r4 = 0x80 sra current MFI number = current MFI found item flag
save updated flags
001804e8: 3c018006 lui r1,0x8006
001804ec: 00270821 addu r1,r1,r7
001804f0: 90239414 lbu r3,-0x6bec(r1) #load move find item flags for these maps
001804f4: 00000000 nop
001804f8: 00831825 or r3,r4,r3 #update MFI flags with this flag
001804fc: 3c018006 lui r1,0x8006
00180500: 00270821 addu r1,r1,r7
00180504: a0239414 sb r3,-0x6bec(r1) #store updated move find item flags for these maps
00180508: 0806014a j 0x00180528 #jump to End
0018050c: 34020001 ori r2,r0,0x0001 #return r2 = 1
check flags
00180510: 3c018006 lui r1,0x8006
00180514: 00270821 addu r1,r1,r7
00180518: 90229414 lbu r2,-0x6bec(r1) #load move find item flags
0018051c: 00000000 nop
00180520: 00441024 and r2,r2,r4 #compare map flags with updated flag
00180524: 2c420001 sltiu r2,r2,0x0001 #0x00 = item already found. 0x01 = item never found before
End:
00180528: 03e00008 jr r31
0018052c: 00000000 nop
Return Locations
001802a0: Rare/common item determination 001803e0: Set map Item/trap data
