From df4969f13af659c0f2575cf8a8d4c7a85203673b Mon Sep 17 00:00:00 2001 From: LDDestroier Date: Mon, 6 Jul 2020 02:23:29 -0400 Subject: [PATCH] Create perlin-screensaver.lua --- perlin-screensaver.lua | 267 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 267 insertions(+) create mode 100644 perlin-screensaver.lua diff --git a/perlin-screensaver.lua b/perlin-screensaver.lua new file mode 100644 index 0000000..135492e --- /dev/null +++ b/perlin-screensaver.lua @@ -0,0 +1,267 @@ +local perlin +do + --[[ + Implemented as described here: + http://flafla2.github.io/2014/08/09/perlinnoise.html + ]]-- + + perlin = {} + perlin.p = {} + + -- Hash lookup table as defined by Ken Perlin + -- This is a randomly arranged array of all numbers from 0-255 inclusive + local permutation = {151,160,137,91,90,15, + 131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23, + 190, 6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33, + 88,237,149,56,87,174,20,125,136,171,168, 68,175,74,165,71,134,139,48,27,166, + 77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244, + 102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,187,208, 89,18,169,200,196, + 135,130,116,188,159,86,164,100,109,198,173,186, 3,64,52,217,226,250,124,123, + 5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42, + 223,183,170,213,119,248,152, 2,44,154,163, 70,221,153,101,155,167, 43,172,9, + 129,22,39,253, 19,98,108,110,79,113,224,232,178,185, 112,104,218,246,97,228, + 251,34,242,193,238,210,144,12,191,179,162,241, 81,51,145,235,249,14,239,107, + 49,192,214, 31,181,199,106,157,184, 84,204,176,115,121,50,45,127, 4,150,254, + 138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180 + } + + -- p is used to hash unit cube coordinates to [0, 255] + for i=0,255 do + -- Convert to 0 based index table + perlin.p[i] = permutation[i+1] + -- Repeat the array to avoid buffer overflow in hash function + perlin.p[i+256] = permutation[i+1] + end + + -- Return range: [-1, 1] + function perlin:noise(x, y, z) + y = y or 0 + z = z or 0 + + -- Calculate the "unit cube" that the point asked will be located in + local xi = bit32.band(math.floor(x),255) + local yi = bit32.band(math.floor(y),255) + local zi = bit32.band(math.floor(z),255) + + -- Next we calculate the location (from 0 to 1) in that cube + x = x - math.floor(x) + y = y - math.floor(y) + z = z - math.floor(z) + + -- We also fade the location to smooth the result + local u = self.fade(x) + local v = self.fade(y) + local w = self.fade(z) + + -- Hash all 8 unit cube coordinates surrounding input coordinate + local p = self.p + local A, AA, AB, AAA, ABA, AAB, ABB, B, BA, BB, BAA, BBA, BAB, BBB + A = p[xi ] + yi + AA = p[A ] + zi + AB = p[A+1 ] + zi + AAA = p[ AA ] + ABA = p[ AB ] + AAB = p[ AA+1 ] + ABB = p[ AB+1 ] + + B = p[xi+1] + yi + BA = p[B ] + zi + BB = p[B+1 ] + zi + BAA = p[ BA ] + BBA = p[ BB ] + BAB = p[ BA+1 ] + BBB = p[ BB+1 ] + + -- Take the weighted average between all 8 unit cube coordinates + return self.lerp(w, + self.lerp(v, + self.lerp(u, + self:grad(AAA,x,y,z), + self:grad(BAA,x-1,y,z) + ), + self.lerp(u, + self:grad(ABA,x,y-1,z), + self:grad(BBA,x-1,y-1,z) + ) + ), + self.lerp(v, + self.lerp(u, + self:grad(AAB,x,y,z-1), self:grad(BAB,x-1,y,z-1) + ), + self.lerp(u, + self:grad(ABB,x,y-1,z-1), self:grad(BBB,x-1,y-1,z-1) + ) + ) + ) + end + + -- Gradient function finds dot product between pseudorandom gradient vector + -- and the vector from input coordinate to a unit cube vertex + perlin.dot_product = { + [0x0]=function(x,y,z) return x + y end, + [0x1]=function(x,y,z) return -x + y end, + [0x2]=function(x,y,z) return x - y end, + [0x3]=function(x,y,z) return -x - y end, + [0x4]=function(x,y,z) return x + z end, + [0x5]=function(x,y,z) return -x + z end, + [0x6]=function(x,y,z) return x - z end, + [0x7]=function(x,y,z) return -x - z end, + [0x8]=function(x,y,z) return y + z end, + [0x9]=function(x,y,z) return -y + z end, + [0xA]=function(x,y,z) return y - z end, + [0xB]=function(x,y,z) return -y - z end, + [0xC]=function(x,y,z) return y + x end, + [0xD]=function(x,y,z) return -y + z end, + [0xE]=function(x,y,z) return y - x end, + [0xF]=function(x,y,z) return -y - z end + } + function perlin:grad(hash, x, y, z) + return self.dot_product[bit32.band(hash,0xF)](x,y,z) + end + + -- Fade function is used to smooth final output + function perlin.fade(t) + return t * t * t * (t * (t * 6 - 15) + 10) + end + + function perlin.lerp(t, a, b) + return a + t * (b - a) + end +end + +local tint = { + 2, + 0.7, + 0.1, +} + +local setTintedPalette = function() + for i = 0, 255 do + term.setPaletteColor(i, + i/ (255 / tint[1]), + i/ (255 / tint[2]), + i/ (255 / tint[3]) + ) + end +end + +local scr_x, scr_y = term.getSize() +scr_x = scr_x * 6 - 1 +scr_y = scr_y * 9 + + +local stringchar = string.char +local tableconcat = table.concat + +local screen = {} +local genScreen = function(x, y) + for yy = y, y + scr_y do + screen[yy] = screen[yy] or {} + for xx = x, x + scr_x do + screen[yy][xx] = screen[yy][xx] or stringchar((perlin:noise( + 0.2 * xx, + 0.2 * yy, + 0.3 + ) * 64) + 64) + end + end +end + +local render = function(x, y, xPos, yPos, width, height) + genScreen(x + xPos, y + yPos) + local buffer = {} + for yy = 1, height do + buffer[yy] = tableconcat( + screen[yy + y + yPos], nil, + x + xPos, + x + width + xPos + ) + end + term.drawPixels(xPos, yPos, buffer) +end + +local getTintFromFile = function() + local file = fs.open("/.noisegen_tint", "r") + if file then + tint = textutils.unserialize(file.readAll()) + file.close() + else + file = fs.open("/.noisegen_tint", "w") + file.write(textutils.serialize(tint)) + file.close() + end + setTintedPalette() +end + +local main = function() + local i, ii, x, y = 1, 1, 1, 1 + local iLimit = 1000 + local evt, e1, e2, e3 + local t_tick = os.startTimer(0) + local t_getTint = os.startTimer(2) + local t_screenwipe = os.startTimer(1) + + term.setGraphicsMode(2) + --getTintFromFile() + + local randTable = {} + for a = 1, iLimit do + randTable[a] = math.random(-2, 2) + end + local width = math.random(20, 100) + local height = math.random(20, 100) + local xPos = math.random(1, scr_x - width - 1) + local yPos = math.random(1, scr_y - height - 1) + + term.setBackgroundColor(colors.black) + term.clear() + + while true do + evt, e1, e2, e3 = os.pullEvent() + if i == iLimit then + width = math.random(20, 100) + height = math.random(20, 100) + xPos = math.random(1, scr_x - width - 1) + yPos = math.random(1, scr_y - height - 1) + i = 1 + end + if evt == "timer" then + if e1 == t_tick then + + x = i + math.sin(math.rad(i * 2)) * 3 + y = math.cos(i / 50) * 10 + + x, y = math.floor(x), math.floor(y) + + render(x, y, xPos, yPos, width, height) + i = i + 1 + ii = ii + 1 + t_tick = os.startTimer(0) + + tint = { + math.sin(100 + ii / 200) / 2 + 1.2, + math.sin(200 + ii / 300) / 2 + 1.2, + math.sin(300 + ii / 600) / 2 + 1.2, + } + setTintedPalette() + + elseif e1 == t_getTint then + --getTintFromFile() + t_getTint = os.startTimer(2) + + end + end + end +end + +local status, message = pcall(main) + +term.setGraphicsMode(0) +for i = 0, 15 do + term.setPaletteColor(2^i, term.nativePaletteColor(2^i)) +end +term.setCursorPos(1, 1) + +if not status then + error(message) +end