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--
-- melisma - extensible and scriptable audio engine
-- Copyright (C) 2026 Ludvig Gunne Lindström
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program. If not, see <https://www.gnu.org/licenses/>.
--
local M = {}
function M.uniform(lo,hi)
return lo + math.random()*(hi - lo)
end
function M.normal(mean,dev)
local u,v,s,t,z0,z1
repeat
u = M.uniform(-1,1)
v = M.uniform(-1,1)
s = u^2 + v^2
until s > 0 and s < 1
t = math.sqrt(-2*math.log(s) / s)
z0 = mean + u*t*dev
z1 = mean + v*t*dev
return z0,z1
end
return M
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