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README.md | ||
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README.md
re3
Intro
The aim of this project is to reverse GTA III for PC by replacing parts of the game one by one such that we have a working game at all times.
How can I try it?
- re3 requires game assets to work, so you need to own a copy of GTA III.
- Since re3 is a DLL that works with original GTA III for now, you need Simple DLL Loader. You can get it here.
- Build re3 or download it from one of the above links (Debug or Release).
- Make sure you included the re3 in
plugins.cfg
ordlls.cfg
. - re3 starts the script
main_freeroam.scm
that comes along with it by default, so you should copy it to fromgamefiles/
to your game'sdata/
directory.
If you want to load original script/story, press and hold G while game is loading. This includes both starting new game and loading save game.
There are various settings at the very bottom of config.h
, you may want to take a look there. i.e. FIX_BUGS define fixes the bugs we've come across.
https://github.com/GTAmodding/re3/tree/master/src/core/config.h
I want to contribute, where should I start?
A good approach is to start at the fringes of the code base, i.e. classes that don't depend on code that we don't have reversed yet. If a function uses only few unreversed functions that would be inconvenient to reverse at the time, calling the original functions is acceptable.
Unreversed / incomplete classes (at least the ones we know)
cAudioManager - being worked on
CBoat
CBrightLights
CBulletInfo
CBulletTraces
CCam
CCamera
CCopPed
CCrane
CCranes
CCullZone
CCullZones
CExplosion
CFallingGlassPane
CFire
CFireManager
CGame
CGarage
CGarages
CGlass
CMenuManager
CMotionBlurStreaks
CObject
CPacManPickups
CPedPath
CPopulation
CRadar
CRecordDataForChase
CRoadBlocks
CRubbish
CSceneEdit
CRunningScript, CTheScripts - being worked on
CSkidmarks
CShotInfo
CSpecialFX
CStats
CTrafficLights
CWanted
CWaterCannon
CWaterCannons
CWeapon
CWeaponEffects
CWeather
CWorld
Coding style
I started writing in Plan 9 style, but realize that this is not the most popular style, so I'm willing to compromise. Try not to deviate too much so the code will look similar across the whole project.
To give examples, these two styles (or anything in between) are fine:
type
functionname(args)
{
if(a == b){
s1;
s2;
}else{
s3;
s4;
}
if(x != y)
s5;
}
type functionname(args)
{
if (a == b) {
s1;
s2;
} else {
s3;
s4;
}
if (x != y)
s5;
}
This one (or anything more extreme) is heavily discouraged:
type functionname ( args )
{
if ( a == b )
{
s1;
s2;
}
else
{
s3;
s4;
}
if ( x != y )
{
s5;
}
}
i.e.
-
Put the brace on the same line as control statements
-
Put the brace on the next line after function definitions and structs/classes
-
Put an
else
on the same line with the braces -
Don't put braces around single statements
-
Put the function return type on a separate line
-
Indent with TABS
As for the less cosmetic choices, here are some guidelines how the code should look:
-
Don't use magic numbers where the original source code would have had an enum or similar. Even if you don't know the exact meaning it's better to call something
FOOBAR_TYPE_4
than just4
, since4
will be used in other places and you can't easily see where else the enum value is used. -
Don't just copy paste code from IDA, make it look nice
-
Use the right types. In particular:
-
don't use types like
__int16
, we haveint16
for that -
don't use
unsigned
, we have typedefs for that -
don't use
char
for anything but actual characters, useint8
,uint8
orbool
-
don't even think about using win32 types (
BYTE
,WORD
, &c.) unless you're writing win32 specific code -
declare pointers like
int *ptr;
, notint* ptr;
-
-
As for variable names, the original gta source code was not written in a uniform style, but here are some observations:
-
many variables employ a form of hungarian notation, i.e.:
-
m_
may be used for class member variables (mostly those that are considered private) -
ms_
for (mostly private) static members -
f
is a float,i
orn
is an integer,b
is a boolean,a
is an array -
do not use
dw
forDWORD
or so, we're not programming win32
-
-
Generally, try to make the code look as if R* could have written it
Environment Variables
Here you can find a list of variables that you might need to set in windows:
"GTA_III_RE_DIR" * path to "gta3_re" game folder usually where this plugin run.
"GTA_III_DIR" * path to "GTAIII" game folder.