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simplex_update.html
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<html>
<head>
<title>WebGL Kolmogoov turbulence generator</title>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
<script id="shader-noise" type="x-shader/x-noise">
precision mediump float;
vec3 mod289(vec3 x) {
return x - floor(x * (1.0 / 289.0)) * 289.0;
}
vec4 mod289(vec4 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;
}
float snoise(vec3 v)
{
const vec2 C = vec2(1.0/6.0, 1.0/3.0) ;
const vec4 D = vec4(0.0, 0.5, 1.0, 2.0);
// First corner
vec3 i = floor(v + dot(v, C.yyy) );
vec3 x0 = v - i + dot(i, C.xxx) ;
// Other corners
vec3 g = step(x0.yzx, x0.xyz);
vec3 l = 1.0 - g;
vec3 i1 = min( g.xyz, l.zxy );
vec3 i2 = max( g.xyz, l.zxy );
// x0 = x0 - 0.0 + 0.0 * C.xxx;
// x1 = x0 - i1 + 1.0 * C.xxx;
// x2 = x0 - i2 + 2.0 * C.xxx;
// x3 = x0 - 1.0 + 3.0 * C.xxx;
vec3 x1 = x0 - i1 + C.xxx;
vec3 x2 = x0 - i2 + C.yyy; // 2.0*C.x = 1/3 = C.y
vec3 x3 = x0 - D.yyy; // -1.0+3.0*C.x = -0.5 = -D.y
// Permutations
i = mod289(i);
vec4 p = permute( permute( permute(
i.z + vec4(0.0, i1.z, i2.z, 1.0 ))
+ i.y + vec4(0.0, i1.y, i2.y, 1.0 ))
+ i.x + vec4(0.0, i1.x, i2.x, 1.0 ));
// Gradients: 7x7 points over a square, mapped onto an octahedron.
// The ring size 17*17 = 289 is close to a multiple of 49 (49*6 = 294)
float n_ = 0.142857142857; // 1.0/7.0
vec3 ns = n_ * D.wyz - D.xzx;
vec4 j = p - 49.0 * floor(p * ns.z * ns.z); // mod(p,7*7)
vec4 x_ = floor(j * ns.z);
vec4 y_ = floor(j - 7.0 * x_ ); // mod(j,N)
vec4 x = x_ *ns.x + ns.yyyy;
vec4 y = y_ *ns.x + ns.yyyy;
vec4 h = 1.0 - abs(x) - abs(y);
vec4 b0 = vec4( x.xy, y.xy );
vec4 b1 = vec4( x.zw, y.zw );
//vec4 s0 = vec4(lessThan(b0,0.0))*2.0 - 1.0;
//vec4 s1 = vec4(lessThan(b1,0.0))*2.0 - 1.0;
vec4 s0 = floor(b0)*2.0 + 1.0;
vec4 s1 = floor(b1)*2.0 + 1.0;
vec4 sh = -step(h, vec4(0.0));
vec4 a0 = b0.xzyw + s0.xzyw*sh.xxyy ;
vec4 a1 = b1.xzyw + s1.xzyw*sh.zzww ;
vec3 p0 = vec3(a0.xy,h.x);
vec3 p1 = vec3(a0.zw,h.y);
vec3 p2 = vec3(a1.xy,h.z);
vec3 p3 = vec3(a1.zw,h.w);
//Normalise gradients
vec4 norm = taylorInvSqrt(vec4(dot(p0,p0), dot(p1,p1), dot(p2, p2), dot(p3,p3)));
p0 *= norm.x;
p1 *= norm.y;
p2 *= norm.z;
p3 *= norm.w;
// Mix final noise value
vec4 m = max(0.5 - vec4(dot(x0,x0), dot(x1,x1), dot(x2,x2), dot(x3,x3)), 0.0);
//m = m * m ;
return 40.0 * dot( m*m*m, vec4( dot(p0,x0), dot(p1,x1),
dot(p2,x2), dot(p3,x3) ) );
}
</script>
<script id="shader-vs" type="x-shader/x-vertex">
attribute vec3 aVertexPosition;
attribute vec2 aPlotPosition;
varying vec3 vTexCoord3D;
varying vec3 offset;
varying float vnoise;
uniform float time;
uniform float alpha;
void main(void) {
vTexCoord3D = aVertexPosition.xyz+vec3(time/17.0,time/13.0,time);
gl_Position = vec4(aVertexPosition.xyz, 1.0);
offset=0.0+0.0*time*vec3(1.0,0.7,0.2);
//float n=10.0*snoise(0.125*vTexCoord3D);
vnoise = snoise(4.0*vTexCoord3D);
}
</script>
<script id="shader-fs" type="x-shader/x-fragment">
uniform float time;
varying vec3 vTexCoord3D;
varying float vnoise;
varying vec3 offset;
uniform float persistence;
uniform float lac;
uniform float scale;
uniform int layers;
void main( void )
{
float n=1.0*snoise(1.0*vTexCoord3D+offset);
n=n+0.5*snoise(2.0*vTexCoord3D+offset);
n=n+1./4.0*snoise(4.0*vTexCoord3D+offset);
n=n+1.0/8.0*snoise(8.0*vTexCoord3D+offset);
n=n+1./16.0*snoise(16.*vTexCoord3D+offset);
gl_FragColor = vec4(n,n,n,1.0);
}
</script>
<script type="text/javascript">
var gl;
function initGL(canvas) {
try {
gl = canvas.getContext("experimental-webgl");
gl.viewportWidth = canvas.width;
gl.viewportHeight = canvas.height;
} catch(e) {
}
if (!gl) {
alert("Could not initialise WebGL, sorry :-(");
}
}
//bind 2 shaders id1, and id2 together
//loading shaders from the DOM
function getShader(gl, id1, id2) {
var shaderScript = document.getElementById(id1);
if (!shaderScript) {
alert("No id1");
return null;
}
var str = "";
var k = shaderScript.firstChild;
while (k) {
if (k.nodeType == 3) {
str += k.textContent;
}
k = k.nextSibling;
//returns the node immediately following the specified one in the parents childnodes.
}
var shaderScript = document.getElementById(id2);
if (!shaderScript) {
alert("No id2");
alert(id2);
return null;
}
var k = shaderScript.firstChild;
while (k) {
if (k.nodeType == 3) {
str += k.textContent;
}
k = k.nextSibling;
}
var shader;
if (shaderScript.type == "x-shader/x-fragment") {
shader = gl.createShader(gl.FRAGMENT_SHADER);
} else if (shaderScript.type == "x-shader/x-vertex") {
shader = gl.createShader(gl.VERTEX_SHADER);
} else {
return null;
}
gl.shaderSource(shader, str);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
alert(gl.getShaderInfoLog(shader));
return null;
}
return shader;
}
var shaderProgram;
var aVertexPosition;
var shadertime
function initShaders() {
var fragmentShader = getShader(gl, "shader-noise","shader-fs");
var vertexShader = getShader(gl, "shader-noise","shader-vs");
shaderProgram = gl.createProgram();
gl.attachShader(shaderProgram, vertexShader);
gl.attachShader(shaderProgram, fragmentShader);
gl.linkProgram(shaderProgram);
if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
alert("Could not initialise shaders - not linked");
}
gl.useProgram(shaderProgram);
aVertexPosition = gl.getAttribLocation(shaderProgram, "aVertexPosition");
gl.enableVertexAttribArray(aVertexPosition);
shadertime = gl.getUniformLocation(shaderProgram, "time");
}
var mytime;
var timestamp;
var framecount;
var vertexPositionBuffer;
var ntriangles;
function domesh1(n){
var vertices=[];
var x0=-0.5;
var y0=-0.5;
var w=1.0;
var h=1.0;
// var nx=Math.round(w/(n*2.0/Math.sqrt(3.0)));
var m=Math.floor(Math.sqrt(3.0)*n/2.0-0.5);
// vertices.push(-1.0,-1.0);
// vertices.push(-1.0,-0.5);
var dx=w/m;
var x,y,i;
var dy;
for (i=0;i<n;i++){
x=x0;
dx=w/(m+0.5);
// alert(dx);
dy=h/n;
y=y0+i*dy;
if (i%2 == 1){
x=x0+w;
dx=-dx;
}
vertices.push(x,y);
//alert(x);
vertices.push(x,y+dy);
vertices.push(x+dx/2,y);
for(j=0;j<m;j++){
vertices.push(x+dx,y+dy);
vertices.push(x+3*dx/2,y);
x=x+dx;
}
vertices.push(x+dx/2,y+dy);
}
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
ntriangles=vertices.length/2;
//alert(ntriangles);
}
function initBuffers(n) {
vertexPositionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexPositionBuffer);
domesh1(n);
//gl.bufferData(); is inside func
vertexPositionBuffer.itemSize = 2;
vertexPositionBuffer.numItems = 3*ntriangles;
}
function drawScene(now) {
gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.bindBuffer(gl.ARRAY_BUFFER, vertexPositionBuffer);
gl.vertexAttribPointer(aVertexPosition, vertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
// gl.drawArrays(gl.TRIANGLES, 0, 3*ntriangles);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, ntriangles);
mytime+=0.01;
gl.uniform1f(shadertime,mytime);
document.getElementById("timeOutput").value = mytime;
document.getElementById("trianglesOutput").value = ntriangles;
document.getElementById("pixelsOutput").value = gl.viewportWidth*gl.viewportHeight;
framecount=framecount+1;
if(framecount==10) {
document.getElementById("FPS").value = 10000.0/(now-timestamp);
framecount=0;
timestamp=now;
}
requestAnimationFrame(drawScene);
}
var num_strips;
function resetTime() {
mytime = 0.0;
num_strips = parseInt(document.getElementById("no_strips").value);
if (vertexPositionBuffer) {
domesh1(num_strips);
}
}
function webGLStart() {
resetTime();
var canvas = document.getElementById("example01-canvas");
initGL(canvas);
initShaders();
initBuffers(num_strips);
gl.clearColor(0.0, 0.0, 0.0, 1.0);
var d=new Date();
timestamp-d.getTime();
framecount=0;
requestAnimationFrame(drawScene);
}
</script>
</head>
<body onload="webGLStart();">
<canvas id="example01-canvas" style="border: none;" width="800" height="800"></canvas>
<h2>Inputs</h2>
<form name="inputs">
<p>
Zoom target: <br />
Number of strips in mesh <input type="text" id="no_strips" value="10" />
FPS <input type="text" id="FPS" value="60.0" />
<p>
<input type="button" value="Reset Time" onClick="resetTime()" />
</form>
<h2>Current state (read-only)</h2>
<form name="outputs">
<p>
Current center: <br />
No. triangles <input type="text" id="trianglesOutput" /> N. pixels <input type="text" id="pixelsOutput" />
<p>
Time: <input type="text" id="timeOutput" />
</form>
<br/>
</body>
</html>