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Code Issues Releases Activity

added extra functions

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This commit is contained in:
grilledham 2018-06-12 17:24:59 +01:00
parent 199bce4b00
commit 99bd04578e
1 changed files with 24 additions and 9 deletions
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33
map_gen/shared/random.lua
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@ -15,19 +15,18 @@ function Random.new(seed1, seed2)
return random
end
local function get_uint(self)
self.z = 36969 * bit32.band(self.z, 65535) + bit32.rshift(self.z, 16)
self.w = 18000 * bit32.band(self.w, 65535) + bit32.rshift(self.w, 16)
local ret = bit32.lshift(self.z, 16) + self.w
return bit32.band(ret, 4294967295)
end
local e = 1 / (2 ^ 32 + 2)
-- return float (0, 1) exclusive
function Random.next(self)
local u = get_uint(self)
return (u + 1.0) * e
local z, w = self.z, self.w
z = 36969 * bit32.band(z, 65535) + bit32.rshift(z, 16)
w = 18000 * bit32.band(w, 65535) + bit32.rshift(w, 16)
self.z, self.w = z, w
local ret = bit32.lshift(z, 16) + w
ret = bit32.band(ret, 4294967295)
return (ret + 1.0) * e
end
-- returns int [min, max] inclusive
@ -38,4 +37,20 @@ function Random.next_int(self, min, max)
return math.floor(u)
end
function Random.next_from_point(x, y)
x = 36969 * bit32.band(x, 65535) + bit32.rshift(x, 16)
y = 18000 * bit32.band(y, 65535) + bit32.rshift(y, 16)
local ret = bit32.lshift(x, 16) + y
ret = bit32.band(ret, 4294967295)
return (ret + 1.0) * e
end
function Random.next_int_from_point(x, y, min, max)
local u = Random.next_from_point(x, y)
u = u * (max - min + 1) + min
return math.floor(u)
end
return Random