How does 0ad (pyrogenesis?) synchronize simulation

[gajop]

Hello,

As the topic title, I'm interested how 0ad synchronizes simulation along multiple PCs in multiplayer.

This is important in order to ensure the same result on multiple PCs with potentialy different FPUs.

SpringRTS for example uses streflop: http://nicolas.brodu.net/en/programmation/streflop/

The assumption here is that you are using a synced engine, am I wrong?

Thanks in advance

[wraitii]

We are using fixed-point numbers for anything that requires synchronisation, which fixes the issue.

[gajop]

Thanks, I assume that also caused no difficulties in porting to Android.

You mind linking the source of your fixed point implementation?

[Itms]

The entire source can be browsed in our bugtracker, and here is the file where Fixed are defined: http://trac.wildfiregames.com/browser/ps/trunk/source/maths/Fixed.h

The 'fixed' type we use is defined line 334:

typedef CFixed<i32, (i32)0x7fffffff, 32, 15, 16, 65536> CFixed_15_16;typedef CFixed_15_16 fixed;