View source for Check and Spread Movement One Tile Around

 BATTLE.BIN : Check and Spread Movement One Tile Around
 ----------------------------------------------------------------
 No Parameters
 Returns Nothing
 
 Check and Spread two Paths around an Origin Tile.
 - From Tile's ground : 4 directions, staying at ground or from above Units
 - From a Unit : 4 directions Staying above units, or walking/flying above units (thanks stepping stone..) 
 --------------------------------------------------------------------------------------------------------------
 00175ea0: 27bdffc8 addiu r29,r29,-0x0038    |
 00175ea4: afb20028 sw r18,0x0028(r29)       |
 00175ea8: 3c128019 lui r18,0x8019           |
 00175eac: 8e52f4e4 lw r18,-0x0b1c(r18)      |{{f/adr|Pointer to Scratch Pad ([[1f800180|<span style=color:blue>0x1f800180]])}}
 00175eb0: afbf0030 sw r31,0x0030(r29)       |
 00175eb4: afb3002c sw r19,0x002c(r29)       |
 00175eb8: afb10024 sw r17,0x0024(r29)       |
 00175ebc: 0c05d56a jal 0x001755a8           |{{f/jal|Transfer_Tiles_Height_Halves_and_Slope_in_Scratch_Pad|Transfer_Tiles_Height_Halves_and_Slope_in_Scratch_Pad}}
 00175ec0: afb00020 sw r16,0x0020(r29)       |
 00175ec4: 92420054 lbu r2,0x0054(r18)       |{{f/load|Loop counter (0x8  : 4 direction and 2 Type of Checks)}} {{f/std| 0x24 when stop riding}}
 00175ec8: 00000000 nop                      |
 00175ecc: 1840002d blez r2,0x00175f84       {{f/Cond|If Invalid : }} {{f/loc| Exit routine}}
 00175ed0: 00008821 addu r17,r0,r0           |{{f/std|Initialize spreading counter}}
 00175ed4: 3c138019 lui r19,0x8019           |
 00175ed8: 2673f500 addiu r19,r19,-0x0b00    |{{f/adr|Table of Spreading routines}}
 00175edc: 2a220004 slti r2,r17,0x0004       |{{f/std|0x1 if Counter < 4}}
                                             {{f/bloop|LOOP - 8 times (each direction - From Tile  and From Above Unit)}}
 00175ee0: 38420001 xori r2,r2,0x0001            |{{f/std|Tile Vs Unit Flag (4 times 0x00 and then 0x1)}}
 00175ee4: a2420040 sb r2,0x0040(r18)            |{{f/store|Store Tile Vs Unit flag}}
 00175ee8: 06210002 bgez r17,0x00175ef4          {{f/Cond|If Counter < 0x00 ??}}
 00175eec: 02201021 addu r2,r17,r0                   |
 00175ef0: 26220003 addiu r2,r17,0x0003              |{{f/std|Counter + 3}}
 00175ef4: 00021083 sra r2,r2,0x02               |{{f/std|Counter /4 (0 or 1)}}
 00175ef8: 00021080 sll r2,r2,0x02               |{{f/std|0 or 4}}
 00175efc: 02221023 subu r2,r17,r2               |{{f/std|Cycle between 0 and 3}}
 00175f00: 00021080 sll r2,r2,0x02               |{{f/std|Word offset ( 0 to c)}}
 00175f04: 00531021 addu r2,r2,r19               |{{f/adr|This iteration Pointer in Table of Spreading routines}}
 00175f08: 8c420000 lw r2,0x0000(r2)             |{{f/adr|Load Routine Address (based on direction)}}
 00175f0c: 00000000 nop                          |
 00175f10: 0040f809 jalr r2,r31                  |{{f/jal|#175ea0Notes|Jal to spreading routine}} {{f/std|Set value at 3a 3c 44 45}}
 00175f14: 00000000 nop                          |
 00175f18: 0c05d57a jal 0x001755e8               |{{f/jal|Set_spreading_Tile_X_and_Y_coordinates|Set_spreading_Tile_X_and_Y_coordinates}}
 00175f1c: 00000000 nop                          |
 00175f20: 0c05d586 jal 0x00175618               |{{f/jal|Check_Spreading_Tile_Coordinates|Check_Spreading_Tile_Coordinates}} {{f/std|Returns r2 if Tile is valid}}
 00175f24: 00000000 nop                          |
 00175f28: 14400011 bne r2,r0,0x00175f70         {{f/Cond|If Spreading Tile is invalid : branch to}} {{f/loc| Next iteration}}
 00175f2c: 00000000 nop                              |
 00175f30: 0c05d59f jal 0x0017567c               |{{f/jal|0017567c_-_00175954|Set Origin Height data}} {{f/std|<nowiki>returns r2 = 0 or 4 (Grid AoE tile)</nowiki>}}
 00175f34: 02202021 addu r4,r17,r0               |{{f/std|Send Counter}}
 00175f38: 1440000d bne r2,r0,0x00175f70         {{f/Cond|<nowiki>If Spreading Tile's AoE >=2</nowiki>}} {{f/std|Else nothing to spread}}
 00175f3c: 00000000 nop                              |
 00175f40: 92420055 lbu r2,0x0055(r18)               |{{f/load|Load Spread Loop counter}}
 00175f44: 00000000 nop                              |
 00175f48: 18400009 blez r2,0x00175f70               {{f/Cond|If Counter is Valid}}
 00175f4c: 00008021 addu r16,r0,r0                       |{{f/std|Initialize Loop counter}}
 00175f50: 02002021 addu r4,r16,r0                       |{{f/std|Counter (For Jal)}}
                                                         {{f/bloop|LOOP - 4 Times (Tile Path, Above Unit Path  - High and Low elevation)}}
 00175f54: 0c05d656 jal 0x00175958                           |{{f/jal|Movement_routine|Movement_routine}} {{f/std|Spread AoE - Set AoE in Grid 0x00, Enable Flag 0x01 in S-Pad 0x200, Decrease Movement left}}
 00175f58: 00002821 addu r5,r0,r0                            |{{f/std|Send 0x00}}
 00175f5c: 92420055 lbu r2,0x0055(r18)                       |{{f/load|Loop counter}}
 00175f60: 26100001 addiu r16,r16,0x0001                     |{{f/std|Counter + 1}}
 00175f64: 0202102a slt r2,r16,r2                            |
 00175f68: 1440fffa bne r2,r0,0x00175f54                 {{f/eloop|Loop - 4 Times (Both elevation - 1 time for Flag 0x10 / 1 time for Flag 0x28)}}
 00175f6c: 02002021 addu r4,r16,r0                           |
 00175f70: 92420054 lbu r2,0x0054(r18)           |{{f/load|Load Loop limit}}
 00175f74: 26310001 addiu r17,r17,0x0001         |{{f/std|Counter +1}}
 00175f78: 0222102a slt r2,r17,r2                |
 00175f7c: 1440ffd8 bne r2,r0,0x00175ee0     {{f/eloop|Loop 8 Times}}
 00175f80: 2a220004 slti r2,r17,0x0004           |
 00175f84: 8fbf0030 lw r31,0x0030(r29)       END
 00175f88: 8fb3002c lw r19,0x002c(r29)
 00175f8c: 8fb20028 lw r18,0x0028(r29)
 00175f90: 8fb10024 lw r17,0x0024(r29)
 00175f94: 8fb00020 lw r16,0x0020(r29)
 00175f98: 27bd0038 addiu r29,r29,0x0038
 00175f9c: 03e00008 jr r31
 00175fa0: 00000000 nop
=== Notes ===
 Table of Spreading routines - 8018f500 <span id="175ea0Notes"></span>
    0x00 - 801754d0 [[Spread_Move_to_East_Preset]]
    0x04 - 801754f4 [[Spread_Move_to_North_Preset]]
    0x08 - 8017551c [[Spread_Move_to_West_Preset]]
    0x0c - 80175540 [[Spread_Move_to_South_Preset]]
=== Return Location ===
 '''BATTLE.BIN'''
 00174d0c: [[00174b8c_-_00174df4]] 
 001787ec: [[Calculate_Pathing]]