Oolite Bulletins

Pleb wrote:

I don't fully (or even pretend to) understand how the code works in Oolite, but I have been told before that the 0-7 (1-8) galaxies in Oolite are hardcoded, which I actually do understand. But the number range of 0-7, could that be extended easilly to 0-13 for instance? Or would like just cause a system error of some kind?

/**+Generate galaxy **/

/* Functions for galactic hyperspace */

uint16 rotatel(uint16 x) /* rotate 8 bit number leftwards */
  /* (tried to use chars but too much effort persuading this braindead
     language to do bit operations on bytes!) */
{ uint16 temp = x&128;
        return (2*(x&127))+(temp>>7);
}

uint16 twist(uint16 x)
{ return (uint16)((256*rotatel(x>>8))+rotatel(x&255));
}

void nextgalaxy(seedtype *s) /* Apply to base seed; once for galaxy 2  */
{ (*s).w0 = twist((*s).w0);  /* twice for galaxy 3, etc. */
  (*s).w1 = twist((*s).w1);  /* Eighth application gives galaxy 1 again*/
  (*s).w2 = twist((*s).w2);
}

/* Original game generated from scratch each time info needed */
void buildgalaxy(uint galaxynum)
{       uint syscount,galcount;
        seed.w0=base0; seed.w1=base1; seed.w2=base2; /* Initialise seed for galaxy 1 */
        for(galcount=1;galcount<galaxynum;++galcount) nextgalaxy(&seed);
        /* Put galaxy data into array of structures */
  for(syscount=0;syscount<galsize;++syscount) galaxy[syscount]=makesystem(&seed);
}

Tricky wrote:

...I just wish I could remember the source.

Pleb wrote:

But from what I discovered last night it seems the code is limited by one line in PlayerEntity.m as there is a line that suggests when it gets to Galaxy 7 (8) and tries to jump to the next galaxy it resets itself. But if you change the value to a higher number it keeps on jumping...

Pleb wrote:

...I was messing with a save game in galaxy 1(0), changed the value to galaxy 8(7) in notepad...

Pleb wrote:

TOf course there must be a way to do this though...

SandJ wrote:

Use the galaxy generation algorithm outside of Oolite to generate what the galaxy would look like. Ditto for the system names.

That way you could get maps very quickly (and lists of names for putting into a dirty words search, if desired).

Pleb wrote:

But if they managed to produce 9 galaxies in ElitePlus surely with enough code modifying you could do the same in Oolite?

cim wrote:

1) The current galaxy jump algorithm "rotates" the galaxy seed. Like a Thargoid ship, the galaxy seed is octagonal, so after eight rotations the algorithm gives the original seed. This is why Thargoids have such command of witchspace. Anyway, for Galaxy 9 you would need a different way of generating the galaxy seed number, which if it was in the core game would require a decision to be made on what Galaxy 9 should be like.

cim wrote:

2) There are probably numerous places in the current code (I can think of several in OXPs, too) which assume in some way that galaxyNumber is in the range 0..7, and that a galactic jump from 7 takes you back to zero. Finding them all would be a significant piece of work.