Liquid War 6 has a modular architecture which allows the programmer (and the player) to plug pretty much any rendering/graphics backend, provided this one is... developped.
As of 2009 the only available backend is still
mod-gl, it will
display the game using 3D acceleration, if available, through the
SDL library, using its GL bindings.
Additionnally, versions available for Microsoft Windows and Mac OS X will
probably never any other backends available. For technical reasons, those
platforms do not have the flexibility of GNU/Linux and do not allow
graphical libraries to be loaded dynamically. In practice, both of them
require hacks that override the standard
main function. Microsoft Windows
WinMain instead, and Mac OS X is even more pedantic,
requiring graphical functions to be executed in the main thread.
mod-gl is just linked statically in those versions, and
the modularity of the game is purely theorical on these platforms.
mod-gl module is really one of the key stones of
Liquid War 6, and if you want to change graphical things, it's definitely
the place to hack on. The source is in
mod-gl backend requires “moderate” hardware, but it
still does require hardware acceleration. Pure software rendering
through mesa for instance, won't
So if you're running Xorg on GNU/Linux and there's a DRI driver for your card, the game should run fine.
On the programmer side, the counterpart is that one should not rely
on fancy OpenGL features. Textures have a maximum size of 512x512
for instance. Of course some maps are bigger than this but this
means that internally,
mod-gl splits them into smaller tiles,
and displays those tiles one by one.
mod-gl backend, the
directory contains lots of common structures, factorized functions which
can (and should, if appliable) be used.