79 lines
5.4 KiB
Markdown
79 lines
5.4 KiB
Markdown
# Built-in cheats (`cheats`, CHEATS)
|
||
|
||
`mods/cheats/CheatsMod` – one groove.exe hook, no data changes.
|
||
|
||
## How the game does it
|
||
|
||
Main menu frame function 0x54B460 (state 2, table 0x579050): whenever a pad bit is held
|
||
(0x5FCF08 ≠ 0) it calls **FUN_0041a160(0)**, the sequence matcher:
|
||
|
||
```
|
||
for i in 0..5:
|
||
if newlyPressed(0x5FCF30) & seq[i][pos[i]]: pos[i] at 0x58483C + 4i
|
||
pos[i]++
|
||
if seq[i][pos[i]] == 0: sequence complete
|
||
if cheatFlags(0x584710) & (1<<i): clear bit (toggle off, no sound)
|
||
else: set bit, play sound (FUN_00546170(0,-127,8))
|
||
i == 2: next mode 0x584700 = 0x0A, 0x584638 = 4 (go to the credits)
|
||
pos[i] = 0
|
||
else pos[i] = 0 any other key resets this cheat
|
||
```
|
||
Sequence table **0x571FBC**, 6 × 9 dwords (8 steps + 0). Menu key bits (FUN_0041a220, raw DIK
|
||
state array 0x58226C + 4·DIK): ↑ 0x10, ↓ 0x40, ← 0x80, → 0x20; Return 0x4000, Space 0x8000,
|
||
C 0x2000, A 0x400, S 0x800, Esc 0x1000, Tab 0x08, backslash 0x01. Typing a sequence works
|
||
with arrows alone; no extra key has to be held (the "hold" is just that the matcher only runs while
|
||
some key is down). The flag word is never saved or reset (only bit 2 is cleared after the
|
||
credits), so cheats stay on until the game quits.
|
||
|
||
## Decoded cheat table
|
||
|
||
| Bit | Sequence | Read at | Effect | Option |
|
||
|---|---|---|---|---|
|
||
| 0 | ← → → → ↑ → → ↑ | 0x54F5C9, VM opcode 0xC0 "hurt player" (FUN_0054f5c0) | energy (0x584E70) is not decreased → no damage, no lost lives | `health` (default on) |
|
||
| 1 | ↓ ← → ↓ ↓ ← → ↓ | strat property 0xEA (0x5524F4), read by the Llama strat at chapter start | property 0xFA (0x584E60, pink idol counter, chapter collectible) = 50 | `collectibles` |
|
||
| 2 | ← ← ← ← → → → → | FUN_0041a160, 0x54A5F6 | plays the credits (CREDITS.dat) right away, then back to the main menu, bit cleared | – (one-shot, not a setting) |
|
||
| 3 | → → ↓ ↓ ↓ ↑ ↓ ↓ | 0x54D6F9 (chapter finished) | chapter flags `|= 3` (collectible + gold coin, KSV +0x08) | `rewards` |
|
||
| 4 | ↑ ↓ → ← ← ← ← ↓ | strat property 0xB2 (0x550EE1) | property 0xC0 (0x584FF4, purple fruit counter) = 500 instead of 0 | `fruit` |
|
||
| 5 | ↑ ← ↓ → ↓ ↓ ↑ ↑ | strat property 0x97 (0x55100C) | property 0xE8 (0x6DA304, charge bar) = 165 instead of 50 | `charge` |
|
||
|
||
Llama strat (t1l1m001 STPC 0x429536, same in all 23 level WADs) – VM short opcodes: 0x07 p =
|
||
push property p, 0x14 n = pop, skip n words if zero, 0x16 n = skip n words, 0x40 p = pop into
|
||
property p, 0x44 n = push n, long opcode 0x45 = push next word:
|
||
```
|
||
if prop[0x97]: prop[0xE8] = 0xA5000 else prop[0xE8] = 0x32000 ; 165 / 50 (20.12)
|
||
if prop[0xB2]: prop[0xC0] = 0x1F4000 else prop[0xC0] = 0 ; 500 / 0
|
||
if prop[0xEA]: prop[0xFA] = 0x32000 ; 50
|
||
```
|
||
Strat property switch: FUN_00550e60 (get, 0x10A cases, table 0x552684), FUN_005509f0 (address
|
||
for store, index table 0x550D64 → 0x550C78).
|
||
|
||
## Patch
|
||
|
||
`call FUN_0041c050` at 0x41D3EA in WinMain (right after the command line is parsed, before
|
||
DirectX init) → cave: `or dword [0x584710], mask` (+ `mov byte [0x5834D0], 1` for
|
||
diagnostics) → `jmp 0x41C050`. The cave writes only game globals, so it needs no data block.
|
||
|
||
## Hidden debug features found
|
||
|
||
| Feature | State | In the mod |
|
||
|---|---|---|
|
||
| `-display_diagnostics` (DAT_005834D0) | works: writes `<COMPUTER>.dispdiag` (DDraw/D3D enumeration) into the game folder; FUN_0040f4f0 opens **every display mode of every DirectDraw device × D3D device** (FUN_00410550/FUN_00410700 = mode switch, FUN_00411000), logs caps and texture formats, closes it again, then returns and the game starts normally. On Windows with two monitors both screens flashed black for 30+ s (tester, 2026-11); invisible under Wine | option `diagnostics`, label "Troubleshooting: write display diagnostics", off by default, warning in its description (tested: ELIASPC.dispdiag, 60 KB) |
|
||
| `c:\kingdom_dbg.txt` | dead: FUN_0040d2c0 (called from FUN_0043c220) only creates the file with "Logfile %s started now/today (write this code!)"; the 43 debug prints (FUN_00414600) go to OutputDebugStringA (0x6DC3E8), never to the file | no |
|
||
| FrameAdvanceDelay (FUN_0043cb40) | slide show `In\001.bmp…` + `In\In.wav` at start, `Out\…` at exit, delay from registry `FrameAdvanceDelay` (default 1.0 s); folders are empty | no (data, not a cheat) |
|
||
| F4 in game | requests state 0x0C (world map) – the normal "back to map" | no |
|
||
| F7 in game | toggles 0x584708 → start row of the strat debug print (0x6D9DB8 = 0x20 / 0x48); nothing visible in retail strats | no |
|
||
| F6 | screenshot `capture%d.tga` | no |
|
||
| `CheatTeleport`, `CheatCharge` strats | present in most level WADs; strat-only logic, not decoded | no |
|
||
|
||
Level select / unlock-all is the save editor's job (`--unlock`), not duplicated here.
|
||
|
||
## Verified in game (Wine 6, Xvfb :8, Village 1-1)
|
||
|
||
* All cheats on: chapter start shows the full charge bar, pink idol 50, purple fruit 500
|
||
(`img/mods/cheats_hud.jpg`, original on the left).
|
||
* Infinite health: running off the cliff into the sea three times – original loses an energy
|
||
segment per fall (HUD shows the red segment), with the cheat the energy HUD never appears, no
|
||
loss (`img/mods/cheats_fall.jpg`).
|
||
* `rewards` (bit 3) decoded only, not played through to a chapter end.
|
||
* Diagnostics: file written, game runs normally.
|