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/samples/custom_shader/noise.html

https://github.com/Anachid/CubicVR.js
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html>
    
    <head>
        <title>
            CubicVR.js: Custom Material Shader using GLSL perlin noise by Stefan Gustavson
        </title>
        <script src="../../CubicVR.js" type="text/javascript">
        </script>
        <script id="vs" type="x-shader/x-vertex">
            uniform float myTimer;
        
            void main(void) 
            {
              vertexTexCoordOut = cubicvr_texCoord();
              
              gl_Position = matrixProjection * matrixModelView * cubicvr_transform();

              vertexNormalOut = matrixNormal * cubicvr_normal();

              cubicvr_lighting();  
            }
        </script>
        <script id="fs" type="x-shader/x-fragment">
            uniform float myTimer;

            //
            // GLSL textureless classic 3D noise "cnoise",
            // with an RSL-style periodic variant "pnoise".
            // Author: Stefan Gustavson (stefan.gustavson@liu.se)
            // Version: 2011-08-22
            //
            // Many thanks to Ian McEwan of Ashima Arts for the
            // ideas for permutation and gradient selection.
            //
            // Copyright (c) 2011 Stefan Gustavson. All rights reserved.
            // Distributed under the MIT license. See LICENSE file.
            // https://github.com/ashima/webgl-noise
            //

            vec4 mod289(vec4 x)
            {
              return x - floor(x * (1.0 / 289.0)) * 289.0;
            }
            
            vec3 mod289(vec3 x)
            {
              return x - floor(x * (1.0 / 289.0)) * 289.0;
            }

            vec4 permute(vec4 x)
            {
              return mod289(((x*34.0)+1.0)*x);
            }

            vec4 taylorInvSqrt(vec4 r)
            {
              return 1.79284291400159 - 0.85373472095314 * r;
            }

            vec3 fade(vec3 t) {
              return t*t*t*(t*(t*6.0-15.0)+10.0);
            }

            // Classic Perlin noise
            float cnoise(vec3 P)
            {
              vec3 Pi0 = floor(P); // Integer part for indexing
              vec3 Pi1 = Pi0 + vec3(1.0); // Integer part + 1
              Pi0 = mod289(Pi0);
              Pi1 = mod289(Pi1);
              vec3 Pf0 = fract(P); // Fractional part for interpolation
              vec3 Pf1 = Pf0 - vec3(1.0); // Fractional part - 1.0
              vec4 ix = vec4(Pi0.x, Pi1.x, Pi0.x, Pi1.x);
              vec4 iy = vec4(Pi0.yy, Pi1.yy);
              vec4 iz0 = Pi0.zzzz;
              vec4 iz1 = Pi1.zzzz;

              vec4 ixy = permute(permute(ix) + iy);
              vec4 ixy0 = permute(ixy + iz0);
              vec4 ixy1 = permute(ixy + iz1);

              vec4 gx0 = ixy0 * (1.0 / 7.0);
              vec4 gy0 = fract(floor(gx0) * (1.0 / 7.0)) - 0.5;
              gx0 = fract(gx0);
              vec4 gz0 = vec4(0.5) - abs(gx0) - abs(gy0);
              vec4 sz0 = step(gz0, vec4(0.0));
              gx0 -= sz0 * (step(0.0, gx0) - 0.5);
              gy0 -= sz0 * (step(0.0, gy0) - 0.5);

              vec4 gx1 = ixy1 * (1.0 / 7.0);
              vec4 gy1 = fract(floor(gx1) * (1.0 / 7.0)) - 0.5;
              gx1 = fract(gx1);
              vec4 gz1 = vec4(0.5) - abs(gx1) - abs(gy1);
              vec4 sz1 = step(gz1, vec4(0.0));
              gx1 -= sz1 * (step(0.0, gx1) - 0.5);
              gy1 -= sz1 * (step(0.0, gy1) - 0.5);

              vec3 g000 = vec3(gx0.x,gy0.x,gz0.x);
              vec3 g100 = vec3(gx0.y,gy0.y,gz0.y);
              vec3 g010 = vec3(gx0.z,gy0.z,gz0.z);
              vec3 g110 = vec3(gx0.w,gy0.w,gz0.w);
              vec3 g001 = vec3(gx1.x,gy1.x,gz1.x);
              vec3 g101 = vec3(gx1.y,gy1.y,gz1.y);
              vec3 g011 = vec3(gx1.z,gy1.z,gz1.z);
              vec3 g111 = vec3(gx1.w,gy1.w,gz1.w);

              vec4 norm0 = taylorInvSqrt(vec4(dot(g000, g000), dot(g010, g010), dot(g100, g100), dot(g110, g110)));
              g000 *= norm0.x;
              g010 *= norm0.y;
              g100 *= norm0.z;
              g110 *= norm0.w;
              vec4 norm1 = taylorInvSqrt(vec4(dot(g001, g001), dot(g011, g011), dot(g101, g101), dot(g111, g111)));
              g001 *= norm1.x;
              g011 *= norm1.y;
              g101 *= norm1.z;
              g111 *= norm1.w;

              float n000 = dot(g000, Pf0);
              float n100 = dot(g100, vec3(Pf1.x, Pf0.yz));
              float n010 = dot(g010, vec3(Pf0.x, Pf1.y, Pf0.z));
              float n110 = dot(g110, vec3(Pf1.xy, Pf0.z));
              float n001 = dot(g001, vec3(Pf0.xy, Pf1.z));
              float n101 = dot(g101, vec3(Pf1.x, Pf0.y, Pf1.z));
              float n011 = dot(g011, vec3(Pf0.x, Pf1.yz));
              float n111 = dot(g111, Pf1);

              vec3 fade_xyz = fade(Pf0);
              vec4 n_z = mix(vec4(n000, n100, n010, n110), vec4(n001, n101, n011, n111), fade_xyz.z);
              vec2 n_yz = mix(n_z.xy, n_z.zw, fade_xyz.y);
              float n_xyz = mix(n_yz.x, n_yz.y, fade_xyz.x);
              return 2.2 * n_xyz;
            }

 
            void main(void) 
            {  
              vec2 texCoord = cubicvr_texCoord();
                
              float q = myTimer+100.0;
              float texScale = 20.0;
              float rnoise = cnoise(vec3((texCoord-0.5)*texScale,q*0.65));
              float gnoise = cnoise(vec3((texCoord-0.5)*texScale,q*-0.7));
              float bnoise = cnoise(vec3((texCoord-0.5)*texScale,q*0.8));
              
              vec4 color = vec4(rnoise/2.0,gnoise,bnoise,1.0);  // use half of red
              
              vec3 normal = cubicvr_normal(texCoord);
                            
              color = cubicvr_environment(color,normal,texCoord);              
              color = cubicvr_lighting(color,normal,texCoord);

              color.r += rnoise/2.0;    // add half red back in after lighting

              gl_FragColor = clamp(color,0.0,1.0);
            }
        </script>
        <script type='text/javascript'>
        
            function webGLStart() {
              // by default generate a full screen canvas with automatic resize
               var gl = CubicVR.init();
               var canvas = CubicVR.getCanvas();

                if (!gl) {
                    alert("Sorry, no WebGL support.");
                    return;
                };

                var myShader = new CubicVR.CustomShader({
                    vertex: "#vs",
                    fragment: "#fs",
                    init: function(shader) {    
                        shader.myTimer.set(0); // not needed, just here for example purposes
                    }
                });

                // Create a box mesh, size 1.0, apply material and UV parameters
                var boxMesh = new CubicVR.Mesh({
                    primitive: {
                        type: "box",
                        size: 1.5,
                        material: {
                            shader: myShader 
                        },
                        uvmapper: {
                            projectionMode: CubicVR.enums.uv.projection.CUBIC,
                            scale: [1, 1, 1]
                        }
                    },
                    compile: true
                });

                // New scene with our canvas dimensions and default camera with FOV 80
                var scene = new CubicVR.Scene(canvas.width, canvas.height, 80);

                // set initial camera position and target
                scene.camera.position = [1, 1, 1];
                scene.camera.target = [0, 0, 0];

                // Add a simple directional light
                scene.bind(new CubicVR.Light({
                    type: "directional",
                    specular: [1, 1, 1],
                    direction: [-0.6, -0.5, 0.6],
                }));
                
                CubicVR.setGlobalAmbient([0.1,0.1,0.1]);
                
                
                // SceneObject container for the mesh
                var boxObject = new CubicVR.SceneObject(boxMesh);
                
                // encapsulate the rotation in a sceneobject TICK event
                var boxEvent = boxObject.addEvent({
                    id: "tick",
                    action:function(event,evh) {
                        var lus = event.getLastUpdateSeconds();
                        var sceneObj = event.getSubject();
     
                        if (myShader.isReady()) {
                            myShader.myTimer.value = event.getSeconds();                        
                        }                                      
                   
                        sceneObj.rotation[0]+=lus*15.0;                             
                        sceneObj.rotation[2]+=lus*13.0;                             
                    }
                });

                // Add SceneObject containing the mesh to the scene
                scene.bind(boxObject);

                // Add our scene to the window resize list
                CubicVR.addResizeable(scene);

                // Start our main drawing loop, it provides a timer and the gl context as parameters
                CubicVR.MainLoop(function(timer, gl) {
                    scene.render();
                    scene.runEvents(timer.getSeconds());
                });

                // initialize a mouse view controller
                var mvc = new CubicVR.MouseViewController(canvas, scene.camera);
           }
        </script>
    </head>
    
    <body onLoad="webGLStart();"></body>

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