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index.html
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<!DOCTYPE html>
<html>
<body>
<style>
html, body, p {
margin: 0;
padding: 0;
}
#overlay {
position: absolute;
right: 0;
top: 0;
}
#overlay p {
color: red;
}
</style>
<canvas id="screen"></canvas>
<div id="overlay">
<p id="fps-counter"></p>
<form name="controls">
<input id="brightness" type="range" min="0" max="4" step="0.0001" value="2.2"/>
<button onclick="save();return false;">Save</button>
<br/>
<label><input type="radio" name="displayMode" value="flame" checked="checked"/> Flame</label>
<label><input type="radio" name="displayMode" value="position"/> Position</label>
<label><input type="radio" name="displayMode" value="colour"/> Colour</label>
</form>
</div>
<script id="shader-show-raw-fs" type="x-shader/x-fragment">
#ifdef GL_ES
precision highp float;
#endif
uniform sampler2D uTexSamp;
void main(void) {
vec3 texel = texture2D(uTexSamp, gl_FragCoord.xy / <%= RESOLUTION %>).rgb;
gl_FragColor = vec4(texel, 1.0);
}
</script>
<script id="shader-show-fs" type="x-shader/x-fragment">
#ifdef GL_ES
precision highp float;
#endif
uniform sampler2D uTexSamp;
uniform float frames;
uniform float brightness;
void main(void) {
vec3 colorTexel = texture2D(uTexSamp, gl_FragCoord.xy / <%= RESOLUTION %>).rgb;
float alpha = texture2D(uTexSamp, gl_FragCoord.xy / <%= RESOLUTION %>).a;
vec3 col = colorTexel * log(alpha) / (log(alpha) * frames);
col = vec3(pow(col.r, 1.0 / brightness), pow(col.g, 1.0 / brightness), pow(col.b, 1.0 / brightness)); // Brightness correction
gl_FragColor = vec4(col, 1.0);
}
</script>
<script id="shader-comp-fs" type="x-shader/x-fragment">
#ifdef GL_ES
precision highp float;
#endif
uniform sampler2D uTexSamp;
uniform float seed;
const float PI = 3.141592;
// Rand
float rand(vec2 co) {
return fract(sin(dot(co, vec2(12.9898 * seed, 78.233 * seed))) * 43758.5453);
}
// COSH Function (Hyperbolic Cosine) http:https://machinesdontcare.wordpress.com/2008/03/10/glsl-cosh-sinh-tanh/
float cosh(float val)
{
float tmp = exp(val);
float cosH = (tmp + 1.0 / tmp) / 2.0;
return cosH;
}
// TANH Function (Hyperbolic Tangent) http:https://machinesdontcare.wordpress.com/2008/03/10/glsl-cosh-sinh-tanh/
float tanh(float val)
{
float tmp = exp(val);
float tanH = (tmp - 1.0 / tmp) / (tmp + 1.0 / tmp);
return tanH;
}
// SINH Function (Hyperbolic Sine) http:https://machinesdontcare.wordpress.com/2008/03/10/glsl-cosh-sinh-tanh/
float sinh(float val)
{
float tmp = exp(val);
float sinH = (tmp - 1.0 / tmp) / 2.0;
return sinH;
}
//float r = length(point);
//float a = atan(point.x/point.y);
//float b = atan(point.y/point.x);
//point = vec2(point.x * 0.5 - 0.5, point.y * 0.5 - 0.5);
//point = 1.0 / (r * r) * point;
//point = exp(point.x - 1.0) * vec2(cos(3.14 * point.y), sin(3.14 * point.y));
//point = vec2(cos(3.14 * point.x) * cosh(point.y), -sin(3.14 * point.x) * sinh(point.y));
//point = vec2(sin(point.x), sin(point.y));
//point = vec2(point.x * sin(r * r) - point.y * cos(r * r), point.x * cos(r * r) + point.y * sin(r * r));
//point = 1.0 / r * vec2(cos(a) + sin(r), sin(a) - cos(r));
//point = r * vec2(sin(a * r), -cos(a * r));
//point = a / PI * vec2(sin(PI * r), cos(PI * r));
//point = pow(r, sin(a)) * vec2(cos(a), sin(a));
//point = 1.0 / r * vec2((point.x - point.y) * (point.x + point.y), 2.0 * point.x * point.y);
//point = vec2(sin(point.x)/cos(point.y), tan(point.y));
void main(void) {
vec2 tex = gl_FragCoord.xy / <%= RESOLUTION %>;
vec2 point = texture2D(uTexSamp, tex).xy;
float l = length(point);
float a = atan(point.x / point.y);
float b = atan(point.y / point.x);
float r = rand(tex);
if(r < 1.0 / 3.0) {
point = 1.0 / l * vec2((point.x - point.y) * (point.x + point.y), 2.0 * point.x * point.y);
} else if(r < 2.0 / 3.0) {
point = 1.0 / (l * l) * point;
} else if(r < 3.0 / 3.0) {
point = vec2(point.x * 0.5, point.y * 0.5 + 0.5);
}
l = length(point);
point = exp(point.x - 1.0) * vec2(cos(l * point.y), sin(l * point.y));
gl_FragColor = vec4(point, 0.0, 1.0);
}
</script>
<script id="shader-comp-col-fs" type="x-shader/x-fragment">
#ifdef GL_ES
precision highp float;
#endif
uniform sampler2D uTexSamp;
uniform float seed;
// Rand
float rand(vec2 co) {
return fract(sin(dot(co.xy, vec2(12.9898 * seed, 78.233 * seed))) * 43758.5453);
}
void main(void) {
vec2 tex = gl_FragCoord.xy / <%= RESOLUTION %>;
vec3 col = texture2D(uTexSamp, tex).rgb;
float r = rand(tex);
if(r < 1.0 / 3.0) {
col = (col + vec3(
1.0, 0.0, 0.0
)) / 2.0;
} else if(r < 2.0 / 3.0) {
col = (col + vec3(
0.0, 1.0, 0.0
)) / 2.0;
} else if(r < 3.0 / 3.0) {
col = (col + vec3(
0.0, 0.0, 1.0
)) / 2.0;
}/* else {
col = (col + vec3(
1.0, 1.0, 0.0
)) / 2.0;
}*/
gl_FragColor = vec4(col, 1.0);
}
</script>
<script id="shader-direct-vs" type="x-shader/x-vertex">
attribute vec3 aVertexPosition;
void main(void) {
gl_Position = vec4(aVertexPosition, 1.0);
}
</script>
<script id="shader-points-fs" type="x-shader/x-fragment">
#ifdef GL_ES
precision highp float;
#endif
varying vec4 fragColor;
void main(void) {
gl_FragColor = fragColor;
}
</script>
<script id="shader-points-vs" type="x-shader/x-vertex">
attribute vec3 aVertexPosition;
uniform sampler2D uTexSamp_Points;
uniform sampler2D uTexSamp_Colors;
varying vec4 fragColor;
void main(void) {
gl_PointSize = 1.0;
vec2 tex = aVertexPosition.xy;
vec2 point = texture2D(uTexSamp_Points, tex).rg;
vec4 color = texture2D(uTexSamp_Colors, tex);
fragColor = color;
gl_Position = vec4(point.xy, 0.0, 1.0);
}
</script>
<script>
(function() {
window.requestAnimFrame = window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || function(callback, element) { setTimeout(callback, 1000 / 60); };
function initGL(canvas) {
try {
var webglOptions = {antialias: false, depth: false};
var gl =
canvas.getContext("webgl", webglOptions) ||
canvas.getContext("experimental-webgl", webglOptions);
gl.viewportWidth = canvas.width;
gl.viewportHeight = canvas.height;
var ext = gl.getExtension("OES_texture_float");
} catch(e) {
} finally {
if (!gl) {
console.log("Could not initialise WebGL");
}
return gl;
}
}
function template(str, replacements) {
for(var prop in replacements) {
var val = replacements[prop];
if(typeof val == "number" && String(val).indexOf(".") == -1) {
val = val + ".0";
}
str = str.replace(new RegExp("<%= " + prop + " %>", "g"), val);
}
return str;
}
function getShader(id, templateOptions) {
var shaderScript = document.getElementById(id);
if (!shaderScript) {
return null;
}
var str = shaderScript.innerHTML;
str = template(str, templateOptions);
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;
}
function compileShader(vs, fs, templateOptions) {
var prog = gl.createProgram();
gl.attachShader(prog, getShader(vs, templateOptions));
gl.attachShader(prog, getShader(fs, templateOptions));
gl.linkProgram(prog);
if (!gl.getProgramParameter(prog, gl.LINK_STATUS)) {
throw new Error("Could not initialise shaders");
}
return prog;
}
var pointsVertexPositionBuffer;
var quadVertexPositionBuffer;
function initBuffers() {
//
pointsVertexPositionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, pointsVertexPositionBuffer);
var vertices = [];
var N = points_size;
for(var x = 0; x < N; x++) {
for(var y = 0; y < N; y++) {
vertices.push(x / N, y / N);
}
}
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
pointsVertexPositionBuffer.itemSize = 2;
pointsVertexPositionBuffer.numItems = N * N;
gl.vertexAttribPointer(prog_points.vertexPositionAttribute, pointsVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
//
quadVertexPositionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, quadVertexPositionBuffer);
var squareData = new Float32Array([
-1, -1,
1, -1,
-1, 1,
1, 1
]);
quadVertexPositionBuffer.itemSize = 2;
quadVertexPositionBuffer.numItems = 4;
gl.bufferData(gl.ARRAY_BUFFER, squareData, gl.STATIC_DRAW);
gl.vertexAttribPointer(prog_comp.vertexPositionAttribute, quadVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
}
var prog_points, prog_comp, prog_comp_col, prog_show, prog_show_raw;
function initShaders() {
//
prog_points = compileShader("shader-points-vs", "shader-points-fs");
prog_points.vertexPositionAttribute = gl.getAttribLocation(prog_points, "aVertexPosition");
gl.enableVertexAttribArray(prog_points.vertexPositionAttribute);
prog_points.color = gl.getUniformLocation(prog_points, "color");
prog_points.uTexSamp_Points = gl.getUniformLocation(prog_points, "uTexSamp_Points");
prog_points.uTexSamp_Colors = gl.getUniformLocation(prog_points, "uTexSamp_Colors");
//
prog_comp = compileShader("shader-direct-vs", "shader-comp-fs", {RESOLUTION: points_size});
prog_comp.vertexPositionAttribute = gl.getAttribLocation(prog_comp, "aVertexPosition");
gl.enableVertexAttribArray(prog_comp.vertexPositionAttribute);
prog_comp.uTexSamp = gl.getUniformLocation(prog_comp, "uTexSamp");
prog_comp.seed = gl.getUniformLocation(prog_comp, "seed");
//
prog_comp_col = compileShader("shader-direct-vs", "shader-comp-col-fs", {RESOLUTION: points_size});
prog_comp_col.vertexPositionAttribute = gl.getAttribLocation(prog_comp_col, "aVertexPosition");
gl.enableVertexAttribArray(prog_comp_col.vertexPositionAttribute);
prog_comp_col.uTexSamp = gl.getUniformLocation(prog_comp_col, "uTexSamp");
prog_comp_col.seed = gl.getUniformLocation(prog_comp_col, "seed");
//
prog_show = compileShader("shader-direct-vs", "shader-show-fs", {RESOLUTION: canvas.width});
prog_show.uTexSamp = gl.getUniformLocation(prog_show, "uTexSamp");
prog_show.frames = gl.getUniformLocation(prog_show, "frames");
prog_show.brightness = gl.getUniformLocation(prog_show, "brightness");
//
prog_show_raw = compileShader("shader-direct-vs", "shader-show-raw-fs", {RESOLUTION: canvas.width});
prog_show_raw.uTexSamp = gl.getUniformLocation(prog_show_raw, "uTexSamp");
}
var texture0, texture1, _texture0, _texture1, texture2;
function initTextures() {
//
texture0 = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture0);
var pixels = [], tSize = points_size;
for(var i = 0; i < tSize; i++) {
for(var j = 0; j < tSize; j++) {
pixels.push(
-1 + 2 * Math.random(),
-1 + 2 * Math.random(),
0,
0
);
}
}
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, tSize, tSize, 0, gl.RGBA, gl.FLOAT, new Float32Array(pixels));
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
// TODO: You heard of functions yeah? I heard they're pretty good. Start using them below.
texture1 = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture1);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, tSize, tSize, 0, gl.RGBA, gl.FLOAT, null);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
//
_texture0 = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, _texture0);
pixels = [];
for(var i = 0; i < tSize; i++) {
for(var j = 0; j < tSize; j++) {
pixels.push(
-1 + 2 * Math.random(),
-1 + 2 * Math.random(),
-1 + 2 * Math.random(),
0
);
}
}
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, tSize, tSize, 0, gl.RGBA, gl.FLOAT, new Float32Array(pixels));
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
//
_texture1 = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, _texture1);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, tSize, tSize, 0, gl.RGBA, gl.FLOAT, null);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
//
texture2 = gl.createTexture();
gl.activeTexture(gl.TEXTURE2);
gl.bindTexture(gl.TEXTURE_2D, texture2);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, grid_size, grid_size, 0, gl.RGBA, gl.FLOAT, null);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
}
var FBO0, FBO1, _FBO0, _FBO1, FBO2;
function initFBOs() {
FBO0 = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, FBO0);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture0, 0);
//
FBO1 = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, FBO1);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture1, 0);
//
_FBO0 = gl.createFramebuffer(); // TODO: Replace texture0/FBO0 with better names
gl.bindFramebuffer(gl.FRAMEBUFFER, _FBO0);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, _texture0, 0);
//
_FBO1 = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, _FBO1);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, _texture1, 0);
//
FBO2 = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, FBO2);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture2, 0);
}
var fps = frames = 0;
var fpsCounterElement = document.getElementById("fps-counter");
setInterval(function() {
fpsCounterElement.innerHTML = fps + " fps";
fps = 0;
}, 1000);
var flag = true;
function iterateIFS() {
gl.viewport(0, 0, points_size, points_size);
gl.disable(gl.BLEND);
gl.activeTexture(gl.TEXTURE0);
var seed = Math.random();
// P = fi(P)
gl.useProgram(prog_comp);
gl.uniform1f(prog_comp.seed, seed);
gl.uniform1i(prog_comp.uTexSamp, 0);
if(flag) {
gl.bindFramebuffer(gl.FRAMEBUFFER, FBO1);
gl.bindTexture(gl.TEXTURE_2D, texture0);
} else {
gl.bindFramebuffer(gl.FRAMEBUFFER, FBO0);
gl.bindTexture(gl.TEXTURE_2D, texture1);
}
gl.bindBuffer(gl.ARRAY_BUFFER, quadVertexPositionBuffer);
gl.vertexAttribPointer(prog_comp.vertexPositionAttribute, quadVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, quadVertexPositionBuffer.numItems);
// C += Ci
gl.useProgram(prog_comp_col);
gl.uniform1f(prog_comp_col.seed, seed);
gl.uniform1i(prog_comp_col.uTexSamp, 0);
if(flag) {
gl.bindFramebuffer(gl.FRAMEBUFFER, _FBO1);
gl.bindTexture(gl.TEXTURE_2D, _texture0);
} else {
gl.bindFramebuffer(gl.FRAMEBUFFER, _FBO0);
gl.bindTexture(gl.TEXTURE_2D, _texture1);
}
gl.bindBuffer(gl.ARRAY_BUFFER, quadVertexPositionBuffer);
gl.vertexAttribPointer(prog_comp_col.vertexPositionAttribute, quadVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, quadVertexPositionBuffer.numItems);
flag = !flag;
}
function plotHistogram() {
// Plot points into "histogram"
gl.viewport(0, 0, grid_size, grid_size);
gl.useProgram(prog_points);
gl.uniform1i(prog_points.uTexSamp_Points, 0);
gl.uniform1i(prog_points.uTexSamp_Colors, 1);
if(flag) {
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, texture1);
gl.activeTexture(gl.TEXTURE1);
gl.bindTexture(gl.TEXTURE_2D, _texture1);
} else {
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, texture0);
gl.activeTexture(gl.TEXTURE1);
gl.bindTexture(gl.TEXTURE_2D, _texture0);
}
gl.bindBuffer(gl.ARRAY_BUFFER, pointsVertexPositionBuffer);
gl.vertexAttribPointer(prog_points.vertexPositionAttribute, pointsVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.enable(gl.BLEND);
gl.blendFunc(gl.ONE, gl.ONE);
gl.bindFramebuffer(gl.FRAMEBUFFER, FBO2);
gl.drawArrays(gl.POINTS, 0, pointsVertexPositionBuffer.numItems);
gl.disable(gl.BLEND);
}
function displayFlame() {
gl.disable(gl.BLEND);
gl.viewport(0, 0, canvas_size, canvas_size);
gl.useProgram(prog_show);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, texture2);
gl.uniform1i(prog_show.uTexSamp, 0);
gl.uniform1f(prog_show.frames, frames);
gl.uniform1f(prog_show.brightness, brightnessElement.value);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.bindBuffer(gl.ARRAY_BUFFER, quadVertexPositionBuffer);
gl.vertexAttribPointer(prog_comp.vertexPositionAttribute, quadVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, quadVertexPositionBuffer.numItems);
}
function displayPosition() {
gl.disable(gl.BLEND);
gl.viewport(0, 0, canvas_size, canvas_size);
gl.useProgram(prog_show_raw);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, texture1);
gl.uniform1i(prog_show_raw.uTexSamp, 0);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.bindBuffer(gl.ARRAY_BUFFER, quadVertexPositionBuffer);
gl.vertexAttribPointer(prog_comp.vertexPositionAttribute, quadVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, quadVertexPositionBuffer.numItems);
}
function displayColour() {
gl.disable(gl.BLEND);
gl.viewport(0, 0, canvas_size, canvas_size);
gl.useProgram(prog_show_raw);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, _texture1);
gl.uniform1i(prog_show_raw.uTexSamp, 0);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.bindBuffer(gl.ARRAY_BUFFER, quadVertexPositionBuffer);
gl.vertexAttribPointer(prog_comp.vertexPositionAttribute, quadVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, quadVertexPositionBuffer.numItems);
}
function drawScene() {
//
iterateIFS();
//
if(frames > 20) {
plotHistogram();
}
//
var displayMode = getRadioValue(radioButtonElements);
switch(displayMode) {
case "flame": displayFlame(); break;
case "position": displayPosition(); break;
case "colour": displayColour(); break;
}
//
fps++;
frames++;
requestAnimFrame(drawScene);
}
function save() {
//
var imgData = canvas.toDataURL();
//
var imgElement = document.createElement('img');
imgElement.src = imgData;
//
document.body.appendChild(imgElement);
}
window.save = save;
function getRadioValue(radioButtonElements) {
for(var i = 0; i < radioButtonElements.length; i++) {
var radioButtonElement = radioButtonElements[i];
if(radioButtonElement.checked)
return radioButtonElement.value;
}
}
function test() {
gl.bindTexture(gl.TEXTURE_2D, texture0);
var pixels = [], tSize = points_size;
for(var i = 0; i < tSize; i++) {
for(var j = 0; j < tSize; j++) {
pixels.push(
-1 + 2 * Math.random(),
-1 + 2 * Math.random(),
0,
0
);
}
}
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, tSize, tSize, 0, gl.RGBA, gl.FLOAT, new Float32Array(pixels));
}
window.test = test;
var gl;
var canvas;
var canvas_size = grid_size = 1024;
var points_size = 512;
var brightnessElement = document.querySelector("#brightness");
var radioButtonElements = document.getElementsByName('displayMode');
function main() {
canvas = document.getElementById("screen");
canvas.width = canvas_size;
canvas.height = canvas_size;
gl = initGL(canvas);
initShaders();
initBuffers();
initTextures();
initFBOs();
drawScene();
}
main();
})();
</script>
</body>
</html>