slide 1gaius

Coursework 2 support

you can either modify quake 1 or quake 3 for the coursework. I’dadvice modifying quake3.

you can download the quake 1 engine and extract it from the commandline using the following commands:

$ cd Desktop

$ wget http://floppsie.comp.glam.ac.uk/download/c/darkplaces-20090128-gore.tar.gz

$ tar zxf darkplaces-20090128-gore.tar.gz

or you could download the quake 3 engine using these commands:

$ cd Desktop

$ wget http://floppsie.comp.glam.ac.uk/download/c/ioquake-20141114.tar.gz

$ tar zxf ioquake-20141114.tar.gz

slide 2gaius

Coursework 2 support

note that the data sets are not included, see later on for how the data isintroduced

slide 3gaius

Coursework Quake 1 texture modifications

if you want to run quake 1 you will need to create the data files. This isbest performed on the server, so:

$ ssh mcgreg.comp.glam.ac.uk

Password: yourpassword

$ initbaseq1

$ exit

from the command line

slide 4gaius

Coursework Quake 1 texture modifications

we will now download the improved textures for the darkplaces (quake1) engine and extract them so we can edit them later

again this is best done on the server, so

open up a command terminal and type the following:

$ ssh mcgreg.comp.glam.ac.uk

Password: secret

$ cd $HOME/.darkplaces/id1

$ wget http://floppsie.comp.glam.ac.uk/download/c/textures.tar.gz

$ tar zxf textures.tar.gz

$ exit

these image files can be edited usinggimp or equivalent tools

now we need to build the darkplaces engine (quake 1)

this must be done on the client not the server

slide 6gaius

Coursework Quake 1 texture modifications

open up a command line terminal and type:

$ cd Desktop

$ cd darkplaces-20090128

$ make sdl-debug

slide 7gaius

Run the quake 1 engine

open up a terminal and type:

$ cd Desktop

$ cd darkplaces-20090128

$ ./darkplaces-sdl

slide 8gaius

Modifying the Darkplaces game engine

extensive modifications have been made to the original Quake gameengine - the result is darkplaces

we will try and change engine in a trivial way:

navigate to the file:Desktop/darkplaces-20090128/cl_particles.c and open itup in an editor

slide 9gaius

Modifying the Darkplaces game engine

move to line170 and here you will see some configuration valueswhich control the particles in darkplaces

enable some of boolean values by changing0’s to 1’s and now bytrial and error try adjusting some of the values of particle variablessee if you can introduce your owngore variable and make itincrease various particle effects, more blood, more smoke, greaterlength of time before bullet holes disappear etcfeel free to modifydarkplaces in any other way

slide 10gaius

Some previous modifications to original Quake (notdarkplaces)

these notes might be useful to gain a flavour of how to modifify quakenote they do not directly apply to darkplaces

slide 11gaius

Introducing gore into the original quake engine (notdarkplaces)

firstly add a console function: in the filer_main.c

void R_Gore_f (void)

{

if (gore) {

gore = false;

Con_Printf("gore off\n");

} else {

gore = true;

Con_Printf("gore on\n");

}

}

slide 12gaius

Introducing gore into the original quake engine (notdarkplaces)

add new command to the filer_main.c inside the function:R_Init

Cmd_AddCommand ("gore", R_Gore_f);

add a boolean variable (external declaration) tocommon.h

extern qboolean gore;

slide 13gaius

Introducing gore into the original quake engine (notdarkplaces)

declare and initialise the variable insidecommon.c

qboolean gore = false;

slide 14gaius

Introducing gore into the original quake engine (notdarkplaces)

inside the function

void COM_InitArgv (int argc, char **argv)

add a test for the presence of the command line option-gore

...

if (COM_CheckParm ("-gore")) {

gore = true;

}

...

slide 15gaius

Now for the fun... modify R_ParticleExplosion2 (notdarkplaces)

void R_ParticleExplosion2 (vec3_t org, int colorStart, int colorLength)

{

int i, j;

particle_t *p;

int colorMod = 0;

int multiplier=1;

if (gore)

multiplier = 2;

for (i=0; i<512*multiplier; i++) {

if (!free_particles)

return;

p = free_particles;

free_particles = p->next;

p->next = active_particles;

active_particles = p;

p->die = cl.time + 0.3;

p->color = colorStart + (colorMod % colorLength);

colorMod++;

...

slide 16gaius

Now for the fun... modify R_ParticleExplosion2 (notdarkplaces)

p->type = pt_blob;

for (j=0 ; j<3 ; j++) {

p->org[j] = org[j] + ((rand()%32)-16);

if (gore)

p->vel[j] = (rand()%512)-256;

else

p->vel[j] = (rand()%1024)-512;

}

}

}

}

slide 17gaius

Quake II

Quake II takes place in a science fiction environment

in the single-player game, the player is a human soldierknown only by his alias, ’Bitterman’ taking part in ’OperationAlien Overlord’a desperate attempt to protect Earth from alien invasion bylaunching a counter-attack on the home planet of the hostilecybernetic Strogg civilisationmost of the other soldiers are captured or killed almost as soon asthey enter the planet’s atmosphere, so it falls upon the player topenetrate the Strogg capital city alone and ultimately to assassinatethe Strogg leader, the Makronfurther reading⟨http://en.wikipedia.org/wiki/Quake_II⟩

slide 18gaius

Technical aspects of Quake II

unlike Quake, where hardware accelerated graphics controllers weresupported only with later patches, Quake II came with OpenGL supportout of the box

the latest version is 3.21contains numerous bug fixes and new maps designed for multipleplayers death-match

Quake II uses an improved client server network model introduced inQuake

the game code of Quake II, which defines all the functionality forweapons, entities and game mechanics, can be changed in any waybecause id Software published the source code of their ownimplementation that shipped with the game

slide 19gaius

Technical aspects of Quake II

Quake II uses the shared library functionality of the operating system toload the game library at run-time - this is how mod authors are able toalter the game and provide different gameplay mechanics, newweapons and much more

originally just the shared library source code was released,ev entually the code which loads the shared library game wasreleased

technically Quake II is harder to modify than Quake as you have to beextremely careful where to add new variables

are they declared in the shared library?or in the parent loader?or both?

slide 20gaius

Technical aspects of Quake II

full source code to Quake II version 3.19 was released under the termsof the GPL on December 21, 2001. Version 3.21 followed later.

since then several Third-party update projects to the game engine havebeen created

the most prominent of these are projects focused on graphicalenhancements to the game such as Quake2maX, EGL and Quake IIEvolved

slide 21gaius

Technical aspects of Quake II

source release also revealed numerous critical security flaws which canresult in remote compromise of both the Quake II client and server

most 3rd party engines include fixes for these bugs

the most popular server-side engine modification, R1Q2, is generallyrecommended as a replacement for the 3.20 release for both clients andservers

the most widely used engine modifications as of 2006 appear to beR1Q2, AprQ2 and EGL, with a large majority of users still usingthe original 3.20 release

slide 22gaius

Technical aspects of Quake II

in July, 2003, Vertigo Software released a port of Quake II for theMicrosoft .NET platform, using Managed C++

it became a poster application for the language, showcasing thepowerful interoperability between .NET and unmanaged C++ code

slide 23gaius

Ports

ports of Quake II were released in 1999 on the Nintendo 64 (ported byRaster Productions L.L.C. ) and PlayStation (ported by HammerHeadLtd.) console platforms

in both cases, the core gameplay was largely identical;however, changes were made to the game sequence,split-screen multiplayer replaced network or Internet play

SGI port was made in 1999 by Philip Nemecin 2002, the game was ported to the Amiga PowerPC platform byHyperion Entertainment

there was also an unofficial port for the Sega Dreamcast,another port to Xbox, named Quake2X, and an unfinished port toPlaystation 2 via homebrew coders

slide 25gaius

Nintendo 64 port of Quake II

the Nintendo 64 version, unlike the PlayStation version, had completelydifferent levels and multiplayer maps which had never been seen before

this version also had new lighting effects, mostly seen on gun fire, andalso used the expansion pack to offer extra graphical detail

slide 26gaius

Xbox 360 port of Quake II

ported version of Quake II was included in the box of Quake 4 for theXbox 360 on a bonus disc

a direct port of the original game, and does not feature any graphicalimprovements, other than it may render in 480p and 720p

it does allow for System Link play for up to 16 players,split-screen for 4co-operative play in single player for up to 16 players or 4 withsplit-screen alone

slide 27gaius

Quake 2

has some of same weapons as Quake 1, and some new onespistol, shotgun, super shotgun, Machine gun, Chaingun, HandGrenade, Grenade Launcher, Rocket Launcher, Hyper Blaster,Railgun, BFG10Kplayers can also throw grenades

recall that Quake hadaxe, shotgun, double-barreled shotgun, nailgun, supernailgun,grenade launcher, rocket launcher, thunderbolt

generally accepted that the multiplayer component of Quake 2 is muchbetter than the single player game

slide 28gaius

Quake 2 Mods

there are so many, capture the flag, new skins, maps, deathmatch mapsetc

slide 29gaius

Question

which of the three quake game engines begat this game engine?screencapture⟨http://floppsie.comp.glam.ac.uk/avi/nexuiz_promo_video.h264.avi⟩