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==Table of Battlescape sound calls==
The following is a list of how most events in TACTICAL generate sounds.  This data is scattered 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.
<nowiki>
Play CAT
Evt# Setting reference          Description
00 00 -- Normal bipedal movement.  Routine 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
</nowiki>
==Other Random Sound Information==
==Other Random Sound Information==
  <nowiki>
  <nowiki>

Revision as of 10:21, 26 April 2012

Other Random Sound Information


406100-subroutine for melee attacks
406110- set default melee sound event to 1A
(4067C8)data base of melee attacks
value		offset	sound event #
00		461B2		2F
01		461BC		2E
02		461C6		2D
03		461E7		skip
04		461E7		skip
05		461E7		skip
06		461E7		skip
07		461C6		2D

Reference points for unit movement sound event IDs. [this word referenced]
.data:0046D1A0   00 00  00 00  01 00  01 00   00 00  00 00 [00 00] 00 00  
.data:0046D1B0  [00 00] 00 00 [00 00] 00 00  [01 00] 01 00 [00 00] 00 00  
.data:0046D1C0  [02 00] 01 00 [00 00] 00 00  [00 00] 00 00 [04 00] 01 00  
.data:0046D1D0  [05 00] 01 00 [06 00] 01 00  [00 00] 00 00 [00 00] 00 00  
.data:0046D1E0  [00 00] 00 00 [0A 00] 01 00  [00 00] 00 00 [00 00] 00 00  
.data:0046D1F0  [18 00] 01 00  01 00  00 00   01 00  0B 00  0C 00  01 00
		 
data set for death scream per unit.
0.data:0046B644 word_46B644     	dw  20h                  ; DATA XREF: sub_40E450+55�r
1.data:0046B646                 	db  20h
2.data:0046B648                		db  20h
3.data:0046B64A                 	db  21h 
4.data:0046B64C                 	db  22h 
5.data:0046B64E                 	db  23h 
6.data:0046B650                 	db  24h 
7.data:0046B652                 	db  25h 
8.data:0046B654                 	db  26h 
9.data:0046B656                 	db  27h 
A.data:0046B658                 	db  28h 
B.data:0046B65A                 	db  29h 
C.data:0046B65C                 	db  2Ah 
D.data:0046B65E                 	db  2Bh 
E.data:0046B660                 	db  2Ch 
F.data:0046B662                 	db  20h
10.data:0046B664                	db  32h 
11.data:0046B666                	db  20h


SUBROUTINE              USED FOR

404650+1AE		PSI ATTACK EFX
406100+4F9		TERRORIST MELEE ATTACK EFX
40B420+111		EXPLOSION EFX
40B420+24F		EXPLOSION EFX?
40E450+73		DEATH SCREAM EFX
40F2C0+285		PLACE ITEM EFX
4110E0+E0		ITEM USE EFX
4110E0+901 		SHOT HIT EFX
419660+1A5		PLACE ITEM (INVENTORY) EFX
419660+346		RELOAD EFX
41DCC0+D1		STUN ROD ATTACK EFX
41EE10+8C		PSI ATTACK EFX
41F0F0+8C		PSI ATTACK EFX
41FD10+8B		MIND PROBE EFX
421140+13		DOORS EFX
4247D0+27A		NON-WALK MOVE EFX
4247D0+4D4		WALK MOVE EFX
42A630+B7		GMTATICS.MID 
42A6F0+18		GMLOSE.MID
42B6F0+E9		GMWIN.MID
43D8C0+E		GEOSCAPE OPEN WINDOW EFX
4407D0+2E		?
4407D0+9C		GMGEOx.MID
445B00+BC		GMINTER.MID
4467C0+1C1		X-COM CRAFT LEFT WEAPON EFX
4467C0+233		X-COM CRAFT RIGHT WEAPON EFX
446DA0+267		UFO HIT EFX
4470B0+F2		UNKNOWN INTERCEPTION EVENT (CRAFT CRASH EFX?)
447EE0+32		GMSTORY.MID
448390+28F		??
448390+2DD		BASE DEFENSE (EVENT 9)
448390+3DC		?0A (BASE DEFENSE?)
448390+3F1		?0A
448390+406		?0A
44A220+15		GMSTORY.MID
44C940+10		GMDEFEND.MID
44CD40+26		GMBASE.MID
44D030+D		GMDEFEND.MID
44D3C0+E		GMMARS.MID
44D690+10		GMMARS.MID
44DACO+10		GMBASE.MID
450F10+91		BLEEP (1)
45DCA0+17		??

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 problem with the CE version is the way the compiler wrote the calculations. In the code, the value was calculated by using multiples of five with bit-shifts to get to 30. This means you can't choose any amount for your ammo. I rewrote these lines to make it simpler to understand and give more freedom to choose the value(Feel free to use these changes. I gave my tank 60 rounds {3Ch}. 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 remaining 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 AMMO AMOUNT SET FOR TACTICAL REFERENCE]
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

Functions used in UFOloader's new interception routines

For those that might want to know how accuracy is calculated with the new options for interception turned on:

X-Craft Accuracy

[(1+((3-(.5*(difficulty level-1)))/UFOsize)/2 ] * Weapon Accuracy ....... [beginner=1..superhuman=5] 

Diff	Ship Size				
	VS	S	M	L	VL
begin	0.8	0.875	1	1.25	2
exp	0.75	0.8125	0.91667	1.125	1.75
vet	0.7	0.75	0.83333	1	1.5
Genius	0.65	0.6875	0.75	0.875	1.25
Super	0.6	0.625	0.66667	0.75	1

UFO Accuracy

60 + (difficulty level *3) - [Cautious Mode bonus (10)]

Comparison of Damage routines


To explain, first the memory address of the Xcraft weapon is loaded to eax. Then the damage value is read from (eax+6) and loaded into bx. This value is sent to the random function where the value generated is returned through eax. Thereafter, the base value (ebx) is added to the random value (eax) for a range of 100-200%. The value of eax has edx subtracted from it (after extensive testing of several encounters and having edx displayed for each attack, edx always seems to be 0). eax is bit-shifted 1 space to the right {divided by two} and the final amount added to the amount of damage the craft has sustained (edi+0Ah). The result is that Xcraft weapons do 50-100% damage.

In the UFO case: the memory location for the UFO stats are set in ecx. Then the UFO weapon power is read (ecx+16h) and put into dx. Then this value is sent to the random funtion and again returned through eax (or ax as is the case here). ecx is set to zero and the random value is checked to see if zero was generated [cmp(compare) ax, cx]. If this is true, the program jumps past the section to assign damage to the Xcraft.



  • The main routine for interdiction in DOS1.4 version is from 330B0~336A8.

Feedback

Any questions or feedback one may have....

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