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Fancy Knowledge #4 - Assigning A Map To A Certain Worldmap
This is a little add-on to the worldmap tutorial, I apologize for the long time you had to wait for this piece of knowledge. Actually, I once
told LU-HO how to change the relations between maps and worldmaps but he somehow didn't include this in Advance Map.
Okay, it's quite straightforward, no complicated flag-selection routines this time. I'm working again with Fire Red US - I heavily recommend
you to be able to "port" my offsets to the ones you need - otherwise you shouldn't be reading this tutorial anyway. ;)
A short summary of what we know from the "long" tutorial: Each "region" got a certain worldmap value. Those values range from 0x00 to 0xC5 where
0xC5 means "blank space". There are several flags connected to those values controlling if you are able to fly to this map. However there must be a connection
between the worldmap values and the worldmap which is displayed when you try to fly to a fly-pos.
Okay, let's save some time and skip the "RAM-Search-Part" and let's go directly to the disassembly view:
ROM:080C0058 loc_80C0058
ROM:080C0058 MOV R7, #0
ROM:080C005A MOV R1, #0
ROM:080C005C LDR R2, =0x2036DFC
ROM:080C005E LDRB R0, [R2,#0x14]
ROM:080C0060 LDR R3, =0x20399D4
ROM:080C0062 MOV R8, R3
ROM:080C0064 CMP R0, #0x8E ; All locations with a worldmap value less
ROM:080C0064 ; or same 0x8E are on worldmap 0.
ROM:080C0066 BLS loc_80C00D8
ROM:080C0068 LDR R4, =unk_83F1AA4
ROM:080C006A MOV R12, R4
ROM:080C006C MOV R10, R12
ROM:080C006E MOV R9, R2
ROM:080C0070
ROM:080C0070 loc_80C0070
ROM:080C0070 MOV R3, #0
ROM:080C0072 LSL R0, R1, #4
ROM:080C0074 SUB R0, R0, R1
ROM:080C0076 LSL R2, R0, #1
ROM:080C0078 MOV R4, R10
ROM:080C007A ADD R0, R2, R4
ROM:080C007C LDRB R0, [R0]
ROM:080C007E ADD R5, R1, #1
ROM:080C0080 CMP R0, #0xC5
ROM:080C0082 BEQ loc_80C00D0
ROM:080C0084 LDR R6, =unk_8 ; Get data table offset
ROM:080C0086 MOV R0, R9
ROM:080C0088 LDRB R1, [R0,#0x14]
ROM:080C008A LSL R4, R5, #0x18
ROM:080C008C
ROM:080C008C loc_80C008C
ROM:080C008C ADD R0, R3, R2
ROM:080C008E ADD R0, R0, R6
ROM:080C0090 LDRB R0, [R0]
ROM:080C0092 CMP R1, R0 ; Check if the current element of the list
ROM:080C0092 ; matches our current location
ROM:080C0094 BNE loc_80C00C0
ROM:080C0096 LSR R7, R4, #0x18
ROM:080C0098 B loc_80C00D0
ROM:080C0098 ; ---------------------------------------------------------------------------
ROM:080C009A DCW 0
ROM:080C009C dword_80C009C DCD 0x47B8
ROM:080C00A0 off_80C00A0 DCD loc_80C4F08+1
ROM:080C00A4 dword_80C00A4 DCD 0x20399D4
ROM:080C00A8 dword_80C00A8 DCD 0x4797
ROM:080C00AC off_80C00AC DCD unk_83F1B00
ROM:080C00B0 dword_80C00B0 DCD 0x4796
ROM:080C00B4 dword_80C00B4 DCD 0x845
ROM:080C00B8 dword_80C00B8 DCD 0x2036DFC
ROM:080C00BC off_80C00BC DCD unk_83F1AA4
ROM:080C00BC
ROM:080C00C0 ; ---------------------------------------------------------------------------
ROM:080C00C0
ROM:080C00C0 loc_80C00C0
ROM:080C00C0 ADD R0, R3, #1
ROM:080C00C2 LSL R0, R0, #0x18
ROM:080C00C4 LSR R3, R0, #0x18
ROM:080C00C6 ADD R0, R3, R2
ROM:080C00C8 ADD R0, R12
ROM:080C00CA LDRB R0, [R0]
ROM:080C00CC CMP R0, #0xC5
ROM:080C00CE BNE loc_80C008C ; If the entry in the data table is
ROM:080C00CE ; not 0xC5, check the next element
ROM:080C00CE ; of the table.
ROM:080C00D0
ROM:080C00D0 loc_80C00D0
ROM:080C00D0 LSL R0, R5, #0x18
ROM:080C00D2 LSR R1, R0, #0x18
ROM:080C00D4 CMP R7, #0
ROM:080C00D6 BEQ loc_80C0070 ; If no matching result was found jump
ROM:080C00D6 ; to the next data table.
ROM:080C00D8
ROM:080C00D8 loc_80C00D8
ROM:080C00D8 MOV R1, R8
ROM:080C00DA LDR R0, [R1]
ROM:080C00DC LDR R2, =0x479B
ROM:080C00DE ADD R0, R0, R2
ROM:080C00E0 STRB R7, [R0] ; define which worldmap is loaded.
ROM:080C00E2 LDR R0, [R1]
ROM:080C00E4 LDR R3, =0x479C
ROM:080C00E6 ADD R0, R0, R3
ROM:080C00E8 STRB R7, [R0]
ROM:080C00EA POP {R3-R5}
ROM:080C00EC MOV R8, R3
ROM:080C00EE MOV R9, R4
ROM:080C00F0 MOV R10, R5
ROM:080C00F2 POP {R4-R7}
ROM:080C00F4 POP {R0}
ROM:080C00F6 BX R0
ROM:080C00F6 ; End of function get_displayed_wmap
ROM:080C00F6
ROM:080C00F6 ; ---------------------------------------------------------------------------
ROM:080C00F8 dword_80C00F8 DCD 0x479B ; DATA XREF: get_displayed_wmap+10Cr
ROM:080C00FC dword_80C00FC DCD 0x479C ; DATA XREF: get_displayed_wmap+114r
Nothing exciting as you can see. A short summary: All elements with a worldmapvalue below the value of the
byte stored at $C0064 (in our case 0x8E) are automatically assigned to worldmap 0. The other three worldmaps have seperated
arrays which hold all values of cities and routes situated on it. Terminated by the value of the blank space - 0xC5 - those
lists/arrays are situated at $3F1AA4.
ROM:083F1AA0 98 1A 3F 08 8F 90 91 96 97 98 99 9A AF B0 B9 C3 ÿ?ÅÉæûùÿÖÜ»¦¦+
ROM:083F1AB0 C5 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +...............
ROM:083F1AC0 00 00 92 93 9B 9C 9D 9E 9F A0 A1 A2 AE B1 B2 B5 ..Æô¢£¥Pƒáí󫦦¦
ROM:083F1AD0 C5 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +...............
ROM:083F1AE0 94 95 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD B3 B4 B6 öòúñѪº¿¬¬½¼¡¦¦¦
ROM:083F1AF0 B7 B8 BA BB BC BD BE BF C0 C1 C2 C5 00 00 00 00 ++¦++++++--+....
Drawing information from the existing data in the ROM we get: (forget the first 4 bytes since the pointer
links to $3F1AA4)
Worldmap 0: 0x00 - 0x8E
Worldmap 1: 0x8F, 0x90, 0x91, 0x96, 0x97, 0x98, 0x99, 0x9A, 0xAF, 0xB0, 0xB9, 0xC3 [terminator 0xC5]
Worldmap 2: 0x92, 0x93, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F, 0xA0, 0xA1, 0xA2, 0xAE, 0xB1, 0xB2, 0xB5 [terminator 0xC5]
Worldmap 3: 0x94, 0x95, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xB3, 0xB4, 0xB6
0xB7, 0xB8, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF, 0xC0, 0xC1, 0xC2 [terminator 0xC5]
Okay, there is nothing left to say. Have fun. |
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