Refactor scripts. Add buffering to gain example.

examples/factorial_router.js

@@ -8,22 +8,22 @@ The CV is split into 120 intervals, each corresponding to a permutation of the i
 */
 
 function permutation(arr, k) {
-	var n = arr.length
+	let n = arr.length
 	// Clone array
 	arr = arr.slice(0)
 	// Compute n!
-	var factorial = 1
-	for (var i = 2; i <= n; i++) {
+	let factorial = 1
+	for (let i = 2; i <= n; i++) {
 		factorial *= i
 	}
 
 	// Build permutation array by selecting the j'th element from the remaining elements until all are chosen.
-	var perm = []
-	for (var i = n; i >= 1; i--) {
+	let perm = []
+	for (let i = n; i >= 1; i--) {
 		factorial /= i
-		var j = Math.floor(k / factorial)
+		let j = Math.floor(k / factorial)
 		k %= factorial
-		var el = arr[j]
+		let el = arr[j]
 		arr.splice(j, 1)
 		perm.push(el)
 	}
@@ -35,14 +35,14 @@ config.bufferSize = 16
 
 function process(block) {
 	// Get factorial index from input 6
-	var k = Math.floor(block.inputs[5][0] / 10 * 120)
+	let k = Math.floor(block.inputs[5][0] / 10 * 120)
 	k = Math.min(Math.max(k, 0), 120 - 1)
 	// Get index set permutation
-	var perm = permutation([1, 2, 3, 4, 5], k)
+	let perm = permutation([1, 2, 3, 4, 5], k)
 	display(perm.join(", "))
-	for (var i = 0; i < 5; i++) {
+	for (let i = 0; i < 5; i++) {
 		// Permute input i
-		for (var j = 0; j < block.bufferSize; j++) {
+		for (let j = 0; j < block.bufferSize; j++) {
 			block.outputs[i][j] = block.inputs[perm[i] - 1][j]
 		}
 	}

examples/gain.js

@@ -1,21 +1,20 @@
-// Simplest possible script using all variables
+// Simplest possible script using all variables, demonstrating buffering
 // by Andrew Belt
 
+config.frameDivider = 1
+config.bufferSize = 32
+
 function process(block) {
 	// Loop through each column
 	for (let i = 0; i < 6; i++) {
-		// Get input
-		let x = block.inputs[i][0]
 		// Get gain knob
 		let gain = block.knobs[i]
-		// Apply gain to input
-		let y = x * gain
 		// Set gain light (red = 0)
 		block.lights[i][0] = gain
 		// Check mute switch
 		if (block.switches[i]) {
 			// Mute output
-			y = 0
+			gain = 0
 			// Enable mute light (red = 0)
 			block.switchLights[i][0] = 1
 		}
@@ -23,7 +22,14 @@ function process(block) {
 			// Disable mute light
 			block.switchLights[i][0] = 0
 		}
-		// Set output
-		block.outputs[i][0] = y
+		// Iterate input/output buffer
+		for (let j = 0; j < block.bufferSize; j++) {
+			// Get input
+			let x = block.inputs[i][j]
+			// Apply gain to input
+			let y = x * gain
+			// Set output
+			block.outputs[i][j] = y
+		}
 	}
 }

examples/gain.lua

@@ -1,28 +1,34 @@
+-- Simplest possible script using all variables, demonstrating buffering
 -- by Andrew Belt
 
+config.frameDivider = 1
+config.bufferSize = 32
+
 function process(block)
 	-- Loop through each column
 	for i=1,6 do
-		-- Get input
-		x = block.inputs[i][1]
 		-- Get gain knob
 		gain = block.knobs[i]
-		-- Apply gain to input
-		y = x * gain
-		-- Set gain light (red = 0)
+		-- Set gain light (red = 1)
 		block.lights[i][1] = gain
 		-- Check mute switch
 		if block.switches[i] then
 			-- Mute output
-			y = 0
-			-- Enable mute light (red = 0)
+			gain = 0
+			-- Enable mute light (red = 1)
 			block.switchLights[i][1] = 1
 		else
 			-- Disable mute light
 			block.switchLights[i][1] = 0
 		end
-		-- Set output
-		block.outputs[i][1] = y
+		-- Iterate input/output buffer
+		for j=1,block.bufferSize do
+			-- Get input
+			x = block.inputs[i][j]
+			-- Apply gain to input
+			y = x * gain
+			-- Set output
+			block.outputs[i][j] = y
+		end
 	end
 end

examples/rainbow.js

@@ -8,16 +8,16 @@ config.frameDivider = 256
 // From https://en.wikipedia.org/wiki/HSL_and_HSV#HSV_to_RGB
 function hsvToRgb(h, s, v) {
 	h *= 6
-	var c = v * s
-	var x = c * (1 - Math.abs(h % 2 - 1))
-	var rgb;
+	let c = v * s
+	let x = c * (1 - Math.abs(h % 2 - 1))
+	let rgb;
 	if (h < 1) rgb = [c, x, 0]
 	else if (h < 2) rgb = [x, c, 0]
 	else if (h < 3) rgb = [0, c, x]
 	else if (h < 4) rgb = [0, x, c]
 	else if (h < 5) rgb = [x, 0, c]
 	else rgb = [c, 0, x]
-	var m = v - c
+	let m = v - c
 	rgb[0] += m
 	rgb[1] += m
 	rgb[2] += m
@@ -25,15 +25,15 @@ function hsvToRgb(h, s, v) {
 }
 
 
-var phase = 0
+let phase = 0
 function process(block) {
 	phase += block.sampleTime * config.frameDivider * 0.5
 	phase %= 1
 
-	for (var i = 0; i < 6; i++) {
-		var h = (1 - i / 6 + phase) % 1
-		var rgb = hsvToRgb(h, 1, 1)
-		for (var c = 0; c < 3; c++) {
+	for (let i = 0; i < 6; i++) {
+		let h = (1 - i / 6 + phase) % 1
+		let rgb = hsvToRgb(h, 1, 1)
+		for (let c = 0; c < 3; c++) {
 			block.lights[i][c] = rgb[c]
 			block.switchLights[i][c] = rgb[c]
 		}

examples/vco.js

@@ -6,22 +6,22 @@
 config.frameDivider = 1
 config.bufferSize = 16
 
-var phase = 0
+let phase = 0
 function process(block) {
 	// Knob ranges from -5 to 5 octaves
-	var pitch = block.knobs[0] * 10 - 5
+	let pitch = block.knobs[0] * 10 - 5
 	// Input follows 1V/oct standard
 	pitch += block.inputs[0][0]
 
 	// The relationship between 1V/oct pitch and frequency is `freq = 2^pitch`.
 	// Default frequency is middle C (C4) in Hz.
 	// https://vcvrack.com/manual/VoltageStandards.html#pitch-and-frequencies
-	var freq = 261.6256 * Math.pow(2, pitch)
+	let freq = 261.6256 * Math.pow(2, pitch)
 	display("Freq: " + freq.toFixed(3) + " Hz")
 
 	// Set all samples in output buffer
-	var deltaPhase = config.frameDivider * block.sampleTime * freq
-	for (var i = 0; i < block.bufferSize; i++) {
+	let deltaPhase = config.frameDivider * block.sampleTime * freq
+	for (let i = 0; i < block.bufferSize; i++) {
 		// Accumulate phase
 		phase += deltaPhase
 		// Wrap phase around range [0, 1]