User talk:Morgan525
I'm also go by "Tycho" on Strategycore forums. I've been learning about disassembly and coding since December of 2011. I guess I started learning disassembly to mod the tank/cannon into a chaingun. I started playing with DOSbox but switched to the CE version and began focusing on its sound problems. Lately, I have been tinkering with Seb's UFOloader and added those fixes of my own. I've also been trying to rearrange Seb's INI file to make it less overwhelming to new users.
The following is a list of how most events in TACTICAL generate sounds. This data is scattered across throughout the executable in various data arrays. First an event number is passed to the sound subroutine. The program then compares the event with its corresponding entry in another section to determine how to play that sound. 06 is the standard method. 01 plays the sound uninterrupted by other sounds.
Table of Battlescape sound calls
Play CAT Evt# Setting reference Description 00 00 -- Normal bipedal movement. Routing refers to tileset and alternates between 1 and 2. 01 01 0E normal tank move 02 01 00 snakeman move 03 02 -- 04 01 0F Flying unit move 05 01 10 Celatid move 06 01 2F Silacoid move 07 02 -- 08 02 -- 09 02 -- 0A 01 28 hovertank/cyberdisk move 0B 06 04 rifle/pistol shoot 0C 06 16 bullet hit 0D 03 14 sliding door opens. Routine randomly plays 1 of the 2 entries in SAMPLE2. 0E 06 03 normal door opens 0F 02 -- 10 06 0C big gun shoots 11 06 0D big gun hits 12 06 0B laser gun shoots 13 06 13 laser shot hits 14 06 12 plasma gun shoots 15 06 13 plasma shot hits 16 06 34 rocket launches 17 06 35 blaster bomb/stun launcher shoots 18 06 0C small explosion (problem: zombie move) 19 06 05 big explosion 1A 02 -- stun rod (*problem*) 1B 06 24 psi attack 1C 06 06 mind probe use* 1D 06 11 reload weapon 1E 06 26 place an item 1F 02 -- 20 04 -- death of a male. Routine randomly plays 1 of the 3 sounds in SAMPLE2. 21 06 17 tank destroyed 22 06 0A sectoid death 23 06 08 snakeman death 24 06 09 etheral death 25 06 06 muton death 26 06 0A floater death 27 06 07 celatid death 28 06 08 silacoid death 29 06 09 chryssalid death 2A 06 0A reaper death 2B 06 17 sectopod death 2C 06 17 cyberdisk death 2D 06 30 zombie & reaper attack 2E 06 31 chryssalid attack 2F 06 32 silacoid attack 30 06 30 celatid attack 31 06 27 throw an item 32 05 -- death of a female. Routine randomly plays 1 of the 3 sounds in SAMPLE2. 33 02 -- 34 02 35 02 36 02 37 02
Modding Tank/Cannon into a Tank/Chaingun
Many people have questions about this. It's fairly easy to change the ammo type of the Tank/Cannon turrent and damage into a AP/rifle and then giving the turret autofire. The real problem is changing the amount of ammo in the tank and not cause problems with the amount of ammo in your base stores. In the executable there are various places that handle updating the amount of ammo for the various events: adding a tank onto a craft(checking if the base has the proper amount of ammo for the tank and removing that amount from base stores, if so), removing the tank from a craft (adding the ammo back to base stores), post-interception-battle (adding the remaining ammo from the tank into base stores and attempting to add the tank back onto the craft), and post base defense (adding the remaining ammo to base stores.) In addition, there is the routine that sets the amount of ammo for the tank in battlescape. If you miss any of these areas, your ammo supply quickly spirals out of control or you get no benefit for the changes you have made.
The DOS version of the game makes it much simpler to adjust the stats, but I have lost the notes on the offsets. The CE version has a problem in the way the compiler wrote the calculations. In the original code, everything was handled in multiples of five with bit-shifts to get to 30 or multiples of 30. I "rewrote" many of these lines to make it simpler to understand and mod(Feel free to use these changes. However, unless you want to deduce for yourself how to modify the proper locations, don't increase the amount of ammo over 63. [This has to do with how the game uses bit-shifts to calculate the ammo during the post-tatical phase]):
TANK/CANNON AMMO ALTERATION
POST-TACTICAL PHASE BASE/CRAFT INVENTORY UPDATE
0x449C53: B8 3C 00 00 00 0F AF C2 90 90 3B F0 7D 2C 66 0F B6 D2 66 01 17 B8 89 88 88 88 F7 EE 03 D6 C7 44 24 10 01 00 00 00 C1 FA 05 8B C2 C1 E8 1F 03 D0 88 55 2C 66 0F B6
D2 66 29 17 66 0F B6 45 00 8B D0 C1 E2 0B 2B D0 C1 E2 04 03 D0 C1 E2 02 66 02 91 1A 01 00 00 90 90
.text:00449C53 mov eax, 3Ch
.text:00449C58 imul eax, edx
.text:00449C5B nop
.text:00449C5C nop
.text:00449C5D cmp esi, eax
.text:00449C5F jge short loc_449C8D
.text:00449C61 movzx dx, dl
.text:00449C65 add [edi], dx
.text:00449C68 mov eax, 88888889h
.text:00449C6D imul esi
.text:00449C6F add edx, esi
.text:00449C71 mov [esp+30h+var_20], 1
.text:00449C79 sar edx, 5
.text:00449C7C mov eax, edx
.text:00449C7E shr eax, 1Fh
.text:00449C81 add edx, eax
.text:00449C83 mov [ebp+2Ch], dl
.text:00449C86 movzx dx, dl
.text:00449C8A sub [edi], dx
.text:00449C8D movzx ax, byte ptr [ebp+0]
.text:00449C92 mov edx, eax
.text:00449C94 shl edx, 0Bh
.text:00449C97 sub edx, eax
.text:00449C99 shl edx, 4
.text:00449C9C add edx, eax
.text:00449C9E shl edx, 2
.text:00449CA1 db 66h
.text:00449CA1 add dl, [ecx+11Ah]
.text:00449CA8 nop
.text:00449CA9 nop
0x449DFA: B8 3C 00 00 00 0F AF C2 3B F0 7D 2E 90 90 66 0F B6 D2 66 01 17 B8 89 88 88 88 F7 EE 03 D6 C7 44 24 10 01 00 00 00 C1 FA 05 8B C2 C1 E8 1F 03 D0 88 55 00 66 0F B6
D2 66 29 17 66 0F B6 45 00 8B D0 C1 E2 0B 2B D0 C1 E2 04 03 D0 C1 E2 02 66 01 91 1A 01 00 00 90 90
.text:00449DFA mov eax, 3Ch
.text:00449DFF imul eax, edx
.text:00449E02 cmp esi, eax
.text:00449E04 jge short loc_449E34
.text:00449E06 nop
.text:00449E07 nop
.text:00449E08 movzx dx, dl
.text:00449E0C add [edi], dx
.text:00449E0F mov eax, 88888889h
.text:00449E14 imul esi
.text:00449E16 add edx, esi
.text:00449E18 mov [esp+30h+var_20], 1
.text:00449E20 sar edx, 5
.text:00449E23 mov eax, edx
.text:00449E25 shr eax, 1Fh
.text:00449E28 add edx, eax
.text:00449E2A mov [ebp+0], dl
.text:00449E2D movzx dx, dl
.text:00449E31 sub [edi], dx
.text:00449E34 movzx ax, byte ptr [ebp+0]
.text:00449E39 mov edx, eax
.text:00449E3B shl edx, 0Bh
.text:00449E3E sub edx, eax
.text:00449E40 shl edx, 4
.text:00449E43 add edx, eax
.text:00449E45 shl edx, 2
.text:00449E48 add [ecx+11Ah], dx
.text:00449E4F nop
.text:00449E50 nop
[TANK/CHAINGUN LOADOUT INFO SENT TO TACTICAL]
0x44ED27: C6 45 76 3C
.text:0044ED27 mov byte ptr [ebp+76h], 3Ch
[TANK/CHAINGUN AMMO CHECK IN BASE INVENTORY AND ALTERATION OF AMOUNT]
0x456410: 66 83 84 90 1A 01 00 00 3C
.text:00456410 add word ptr [eax+edx*4+11Ah], 3Ch
0x4564F1: 66 83 F9 3C
.text:004564F1 cmp cx, 3Ch
0x456512: 83 C1 C4
.text:00456512 add ecx, 0FFFFFFC4h (add ecx, -3Ch)
[Alternate option]
0x456512: 83 E9 3C
.text:00456512 sub ecx, 3Ch
TANK STATS start at offset 47573B
TANK UFOpaedia info 4752B0~4752CF