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fake-fft.lua
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-- title: Fake FFT
-- author: @jtruk
-- desc: A shim to run effects that use the TIC-80 FFT fork on non-FFT builds
-- script: lua
-- group: Hex Heroes
-- date: Apr 2023
-- license: Code Credit License v1.1.0
-- Feel welcome to use this function
-- Explanation/send improvements via:
-- https://github.com/creativenucleus/tic-80-sketches/tree/main/fake-fft
fakeFft=function(n)
local bpm=100
local cycle=(60*1000)/bpm
local peaks={}
peaks={{
pos=3,
t=1-(time()%cycle)/cycle
},{
pos=50,
t=1-((time()+cycle/4)%cycle)/cycle
},{
pos=90,
t=1-((time()+cycle/2)%cycle)/cycle
},{
pos=130,
t=1-((2*time()+cycle/8)%cycle)/cycle
},{
pos=230,
t=1-((2*time()+cycle/4)%cycle)/cycle
}}
local d=0
for p=1,#peaks do
peak=peaks[p]
d=d+math.max(0,peak.t*(1-math.abs((n-peak.pos)/10^0.4)))
end
d=math.max(0,d+math.random()*.3)
return math.min(1,d/(n+1)^.4)
end
EQ={}
function BOOT()
for i=0,255 do
EQ[i]=0
end
end
useRealFftFn=true
function TIC()
if btnp(4) then
useRealFftFn=not useRealFftFn
end
cls()
for n=0,255 do
local fftval=0
if useRealFftFn then
fftval=fft and fft(n) or 0
else
fftval=fakeFft(n)
end
local x=(n//64)*60
local y=60+n%64
line(x,y,x+EQ[n]*50,y,1)
line(x,y,x+fftval*50,y,2+(n%10))
if(fftval>EQ[n])then
EQ[n]=fftval
else
-- decay
EQ[n]=EQ[n]*.995
end
end
print("Fake FFT generator",0,0,12,false,2)
print("Press button A (keyboard: Z) to toggle",0,15,12)
local str="FFT: "
if(useRealFftFn)then
if fft then
str=str.."Real"
else
str=str.."[!Real is not available]"
end
else
str=str.."Fake"
end
print(str,0,50,12)
end
-- <WAVES>
-- 000:00000000ffffffff00000000ffffffff
-- 001:0123456789abcdeffedcba9876543210
-- 002:0123456789abcdef0123456789abcdef
-- </WAVES>
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