Doomworld Forums - DEH for ability to see VPO (numvisplanes>128) with doom2+

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entryway
Forum Staple

Posts: 2587
Registered: 01-04

Only for doom2-plus-1.92.6

Usage: apply this DEH for doom2p.exe, start any pwad with hacked exe, activate pistol. If AMMO is 0 in statusbar - there was no overflow of 'vanilla' visplanes limit (MAXVISPLANES = 128)

code:Patch File for DeHackEd v3.0

# Note: Use the pound sign ('#') to start comment lines.

Doom version = 19
Patch format = 6

Weapon 1 (Pistol)
Ammo type = 124732

Already patched doom2p.exe and show_vpo.deh:
http://prboom-plus.sourceforge.net/doom2p_show_vpo.zip

Last edited by entryway on 08-11-09 at 20:30

08-11-09 19:59 #

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esselfortium
Cumulonimbus Antagonistic Posting

Posts: 5268
Registered: 01-02

O_O

....HOW?!

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08-11-09 20:25 #

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entryway
Forum Staple

Posts: 2587
Registered: 01-04

esselfortium said:
....HOW?!

With "Ammo type" overflow it's possible to see any memory value in AMMO part of statusbar.

124732 = (0x100000 + 0x298 * 128 - 0x9AF14) / 4 + 1

0x100000 - address of visplanes table from doom2+
0x298 - size of one visplane (sizeof(visplane_t))
128 - MAXVISPLANES from doom2.exe
0x100000 + 0x298 * 128 == &visplanes[128]
0x9AF14 - address of players[0].ammo[0]
+1 is for visplane_t::pichum instead of visplane_t::height

Thus, address of players[0].ammo[124732] actually is equal to address of visplanes[128].picnum which is initialized to 0 at start.

08-11-09 20:54 #

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myk
volveré y seré millones

Posts: 14423
Registered: 04-02

Ah, see, VPOs are a good thing now... they give you ammo!

(This should be useful while testing Doom levels from the DOS prompt.)

08-11-09 21:29 #

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fraggle
Super Moderator

Posts: 6000
Registered: 07-00

Cool hack!

08-11-09 21:34 #

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Mechadon
Senior Member

Posts: 1787
Registered: 12-06

Wow, amazing :O

08-11-09 21:47 #

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printz
CRAZY DUMB ZEALOT

Posts: 6849
Registered: 06-06

What if vanilla mods appear, replacing gun slots with various indicators?

Heh heh. Not even CHOCOLATE DOOM will work with them!

08-12-09 09:06 #

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Gez
Why don't I have a custom title by now?!

Posts: 7046
Registered: 07-07

PROTIP: When visplanes overflow, shoot at them until they die.

08-12-09 09:17 #

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entryway
Forum Staple

Posts: 2587
Registered: 01-04

printz said:
Heh heh. Not even CHOCOLATE DOOM will work with them!

But you can try this in Choco:

code:Patch File for DeHackEd v3.0

# Note: Use the pound sign ('#') to start comment lines.

Doom version = 21
Patch format = 6

Weapon 1 (Pistol)
Ammo type = 12

Will give you one bullet for every killed monster (14 for secrets count). Works in prb+ 2.5.0.4.test too.

08-12-09 09:35 #

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