From 9eb4b172b3c638a0e5cce6c3694aa59fe390032b Mon Sep 17 00:00:00 2001
From: clrnd <welcometothechango@gmail.com>
Date: Fri, 19 Jun 2020 01:37:31 -0300
Subject: [PATCH] Adds audio vec3 uniform

---
 server/assets/js/audio.js |  1 +
 static/index.html         | 12 +++++++--
 static/js/audio.js        | 51 +++++++++++++++++++++++++++++++++++++++
 static/js/helpers.js      |  2 +-
 4 files changed, 63 insertions(+), 3 deletions(-)
 create mode 120000 server/assets/js/audio.js
 create mode 100644 static/js/audio.js

diff --git a/server/assets/js/audio.js b/server/assets/js/audio.js
new file mode 120000
index 0000000..f939c3f
--- /dev/null
+++ b/server/assets/js/audio.js
@@ -0,0 +1 @@
+../../../static/js/audio.js
\ No newline at end of file
diff --git a/static/index.html b/static/index.html
index 90ed225..3d03203 100755
--- a/static/index.html
+++ b/static/index.html
@@ -57,11 +57,13 @@
 		<link rel="stylesheet" href="css/codemirror.css">
 		<link rel="stylesheet" href="css/default.css">
 
+		<script src="https://unpkg.com/meyda/dist/web/meyda.min.js"></script>
 		<script src="js/lzma.js"></script>
 		<script src='js/jquery.js'></script>
 		<script src='js/helpers.js'></script>
 		<script src="js/codemirror.js"></script>
 		<script src="js/glsl.js"></script>
+		<script src="js/audio.js"></script>
 
 		<script id="example" type="x-shader/x-fragment">precision mediump float;
 
@@ -70,6 +72,7 @@
 uniform float time;
 uniform vec2 mouse;
 uniform vec2 resolution;
+uniform vec3 audio;
 
 void main( void ) {
 
@@ -81,7 +84,7 @@
 	color += sin( position.x * sin( time / 5.0 ) * 10.0 ) + sin( position.y * sin( time / 35.0 ) * 80.0 );
 	color *= sin( time / 10.0 ) * 0.5;
 
-	gl_FragColor = vec4( vec3( color, color * 0.5, sin( color + time / 3.0 ) * 0.75 ), 1.0 );
+	gl_FragColor = vec4( audio + vec3( color, color * 0.5, sin( color + time / 3.0 ) * 0.75 ), 1.0 );
 
 }</script>
 
@@ -167,7 +170,7 @@
 			var code, canvas, gl, buffer, currentProgram, vertexPosition, screenVertexPosition, panButton,
 			parameters = { startTime: Date.now(), time: 0, mouseX: 0.5, mouseY: 0.5, screenWidth: 0, screenHeight: 0 },
 			surface = { centerX: 0, centerY: 0, width: 1, height: 1, isPanning: false, isZooming: false, lastX: 0, lastY: 0 },
-			frontTarget, backTarget, screenProgram, getWebGL, resizer = {}, compileOnChangeCode = true;
+			frontTarget, backTarget, screenProgram, getWebGL, resizer = {}, compileOnChangeCode = true, audio;
 
 			init();
 			if (gl) { animate(); }
@@ -464,6 +467,8 @@
 
 				compileScreenProgram();
 
+				audio = new Audio();
+
 			}
 
 			function isCodeVisible() {
@@ -615,6 +620,7 @@
 
 				// Cache uniforms
 
+				cacheUniformLocation( program, 'audio' );
 				cacheUniformLocation( program, 'time' );
 				cacheUniformLocation( program, 'mouse' );
 				cacheUniformLocation( program, 'resolution' );
@@ -873,11 +879,13 @@
 				if ( !currentProgram ) return;
 
 				parameters.time = Date.now() - parameters.startTime;
+				audio.tick();
 
 				// Set uniforms for custom shader
 
 				gl.useProgram( currentProgram );
 
+				gl.uniform3f( currentProgram.uniformsCache[ 'audio' ], audio.fft[0], audio.fft[1], audio.fft[2]);
 				gl.uniform1f( currentProgram.uniformsCache[ 'time' ], parameters.time / 1000 );
 				gl.uniform2f( currentProgram.uniformsCache[ 'mouse' ], parameters.mouseX, parameters.mouseY );
 				gl.uniform2f( currentProgram.uniformsCache[ 'resolution' ], parameters.screenWidth, parameters.screenHeight );
diff --git a/static/js/audio.js b/static/js/audio.js
new file mode 100644
index 0000000..1f5f2e9
--- /dev/null
+++ b/static/js/audio.js
@@ -0,0 +1,51 @@
+'use strict';
+
+function Audio(numBins, cutoff, smooth, scale) {
+
+	numBins = numBins || 3;
+	smooth = smooth || 0.4;
+
+	function tick() {
+		if (this.meyda) {
+			var features = this.meyda.get()
+			if (features) {
+				var reducer = (accumulator, currentValue) => accumulator + currentValue;
+
+				var spacing = Math.floor(features.loudness.specific.length / this.bins.length);
+				this.prevBins = this.bins.slice(0);
+
+				this.bins = this.bins.map((bin, index) =>
+					features.loudness.specific.slice(index * spacing, (index + 1) * spacing).reduce(reducer) / spacing
+				).map((bin, index) =>
+					bin * (1.0 - smooth) + this.prevBins[index] * smooth);
+
+				this.fft = this.bins;
+			}
+		}
+	}
+
+	function init() {
+		this.bins = Array(numBins).fill(0)
+		this.prevBins = Array(numBins).fill(0)
+		this.fft = Array(numBins).fill(0)
+
+		window.navigator.mediaDevices.getUserMedia({ video: false, audio: true })
+			.then((stream) => {
+				var context = new AudioContext()
+				var audio_stream = context.createMediaStreamSource(stream)
+
+				this.meyda = Meyda.createMeydaAnalyzer({
+					audioContext: context,
+					source: audio_stream,
+					featureExtractors: [
+						'loudness',
+					]
+				})
+			})
+			.catch((err) => console.log('ERROR', err))
+
+		return this;
+	}
+
+	return { init: init, tick: tick }.init();
+}
diff --git a/static/js/helpers.js b/static/js/helpers.js
index 6987ca8..72b8e86 100755
--- a/static/js/helpers.js
+++ b/static/js/helpers.js
@@ -29,7 +29,7 @@ function load_url_code() {
 
 	} else {
 
-		readURL( '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' );
+		readURL( '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' );
 
 	}
 }