Created
January 24, 2016 17:01
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| """ | |
| Generates full set of planet names across all galaxies | |
| in the Elite series of games. | |
| Original name generation algorithm by David Braben and Ian Bell. | |
| Leestian Evil Juice also to Christian Pinder and the Oolite crew. | |
| Usage: | |
| $ python ./elitenames.py <galaxy> | |
| Paul Slavin <pmslavin@gmail.com> | |
| """ | |
| import sys | |
| seed0 = 0x5A4A | |
| seed1 = 0x0248 | |
| seed2 = 0xB753 | |
| w0 = seed0 | |
| w1 = seed1 | |
| w2 = seed2 | |
| digrams0 = "ABOUSEITILETSTONLONUTHNO" | |
| digrams1 = "..LEXEGEZACEBISOUSESARMAINDIREA.ERATENBERALAVETIEDORQUANTEISRION" | |
| digrams = digrams0 + digrams1 | |
| def rotl8(b): | |
| b &= 0xFF | |
| return (b & 127) << 1 | b >> 7 | |
| def twist(): | |
| global w0, w1, w2 | |
| wtemp = w0 + w1 + w2 | |
| wtemp &= (1 << 16) - 1 | |
| w0 = w1 | |
| w1 = w2 | |
| w2 = wtemp | |
| def select(w2): | |
| mask = (1 << 5) - 1 | |
| sbits = (w2 >> 8) & mask | |
| return sbits << 1 | |
| def getPair(idx): | |
| dg = digrams1[idx:idx+2] | |
| return dg.replace(".", "") | |
| def isLongName(w0): | |
| return bool(w0 & (1 << 6)) | |
| def makeName(): | |
| name = "" | |
| isLong = isLongName(w0) | |
| for _ in xrange(3): | |
| idx = select(w2) | |
| name += getPair(idx) | |
| twist() | |
| if isLong: | |
| idx = select(w2) | |
| name += getPair(idx) | |
| twist() | |
| return name | |
| def resetState(): | |
| global w0, w1, w2 | |
| w0 = seed0 | |
| w1 = seed1 | |
| w2 = seed2 | |
| def setGalaxy(g): | |
| global w0, w1, w2 | |
| resetState() | |
| while(g > 1): | |
| w0t = rotl8(w0 >> 8) | |
| w0b = rotl8(w0 & 0xFF) | |
| w0 = (w0t << 8) | w0b | |
| w1t = rotl8(w1 >> 8) | |
| w1b = rotl8(w1 & 0xFF) | |
| w1 = (w1t << 8) | w1b | |
| w2t = rotl8(w2 >> 8) | |
| w2b = rotl8(w2 & 0xFF) | |
| w2 = (w2t << 8) | w2b | |
| g -= 1 | |
| if __name__ == "__main__": | |
| if len(sys.argv) > 1: | |
| gal = int(sys.argv[1]) | |
| else: | |
| gal = 1 | |
| setGalaxy(gal) | |
| for _ in xrange(256): | |
| print(makeName()) |
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