forked from patriciogonzalezvivo/thebookofshaders
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graph.html
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graph.html
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<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
<title>GLSL Editor</title>
<link href='/favicon.gif' rel='shortcut icon'/>
<!-- GLSL Canvas -->
<script type='text/javascript' src='https://thebookofshaders.com/glslCanvas/GlslCanvas.js'></script>
<link type='text/css' rel='stylesheet' href='https://thebookofshaders.com/glslEditor/glslEditor.css'>
<script type='application/javascript' src='https://thebookofshaders.com/glslEditor/glslEditor.js'></script>
<style>
body {
background: #FFFFFF;
}
#glsl_editor {
display: block;
margin-top: auto;
margin-bottom: auto;
}
canvas.ge_canvas {
float: top;
position: relative;
display: block;
margin-left: auto;
margin-right: auto;
max-width: 1200px;
}
.CodeMirror {
background: #FFFFFF;
font-size: 14px;
line-height: 1.5em;
margin-left: auto;
margin-right: auto;
max-width: 700px;
}
.cm-s-default .cm-variable-3 {
color: #708;
}
.cm-s-default .cm-keyword {
color: #708;
}
</style>
</head>
<body>
<div id='glsl_editor'></div>
</body>
<script type='text/javascript'>
var preFunction = '\n\
#ifdef GL_ES\n\
precision mediump float;\n\
#endif\n\
\n\
#define PI 3.14159265359\n\
\n\
uniform vec2 u_resolution;\n\
uniform vec2 u_mouse;\n\
uniform float u_time;\n\
\n\
float lineJitter = 0.5;\n\
float lineWidth = 7.0;\n\
float gridWidth = 1.7;\n\
float scale = 0.001;\n\
float zoom = 2.5;\n\
vec2 offset = vec2(0.5);\n\
\n';
var postFunction = '\n\
float rand(vec2 co){\n\
return fract(sin(dot(co.xy,vec2(12.9898,78.233)))*43758.5453);\n\
}\n\
\n\
vec3 plot2D(in vec2 _st, in float _width ) {\n\
const float samples = 3.0;\n\
\n\
vec2 steping = _width*vec2(scale)/samples;\n\
\n\
float count = 0.0;\n\
float mySamples = 0.0;\n\
for (float i = 0.0; i < samples; i++) {\n\
for (float j = 0.0;j < samples; j++) {\n\
if (i*i+j*j>samples*samples) \n\
continue;\n\
mySamples++;\n\
float ii = i + lineJitter*rand(vec2(_st.x+ i*steping.x,_st.y+ j*steping.y));\n\
float jj = j + lineJitter*rand(vec2(_st.y + i*steping.x,_st.x+ j*steping.y));\n\
float f = function(_st.x+ ii*steping.x)-(_st.y+ jj*steping.y);\n\
count += (f>0.) ? 1.0 : -1.0;\n\
}\n\
}\n\
vec3 color = vec3(1.0);\n\
if (abs(count)!=mySamples)\n\
color = vec3(abs(float(count))/float(mySamples));\n\
return color;\n\
}\n\
\n\
vec3 grid2D( in vec2 _st, in float _width ) {\n\
float axisDetail = _width*scale;\n\
if (abs(_st.x)<axisDetail || abs(_st.y)<axisDetail) \n\
return 1.0-vec3(0.65,0.65,1.0);\n\
if (abs(mod(_st.x,1.0))<axisDetail || abs(mod(_st.y,1.0))<axisDetail) \n\
return 1.0-vec3(0.80,0.80,1.0);\n\
if (abs(mod(_st.x,0.25))<axisDetail || abs(mod(_st.y,0.25))<axisDetail) \n\
return 1.0-vec3(0.95,0.95,1.0);\n\
return vec3(0.0);\n\
}\n\
\n\
void main(){\n\
vec2 st = (gl_FragCoord.xy/u_resolution.xy)-offset;\n\
st.x *= u_resolution.x/u_resolution.y;\n\
\n\
scale *= zoom;\n\
st *= zoom;\n\
\n\
vec3 color = plot2D(st,lineWidth);\n\
color -= grid2D(st,gridWidth);\n\
\n\
gl_FragColor = vec4(color,1.0);\n\
}';
var funct = 'float function (float x) {\n\
float y = x;\n\
return y;\n\
}';
function loadjscssfile(filename, filetype, callback){
if (filetype=="js") { //if filename is a external JavaScript file
var fileref = document.createElement('script')
fileref.setAttribute("type","text/javascript")
fileref.setAttribute("src", filename)
}
else if (filetype=="css") { //if filename is an external CSS file
var fileref = document.createElement("link")
fileref.setAttribute("rel", "stylesheet")
fileref.setAttribute("type", "text/css")
fileref.setAttribute("href", filename)
}
fileref.onload = callback;
fileref.onreadystatechange = callback;
if (typeof fileref != "undefined") {
document.getElementsByTagName("head")[0].appendChild(fileref)
}
}
window.onload = function() {
// if ()
if (window.GlslEditor && window.GlslEditor) {
init();
}
else {
console.log('Try to load a local glslEditor');
loadjscssfile('src/glslCanvas/build/GlslCanvas.js', 'js');
loadjscssfile('src/glslEditor/build/glslEditor.css', 'css');
loadjscssfile('src/glslEditor/build/glslEditor.js', 'js', init);
}
};
function init() {
window.glslEditor = new GlslEditor('#glsl_editor', {
canvas_width: 900,
canvas_height: 300,
canvas_follow: true,
canvas_float: false,
lineNumbers: false,
frag_header: preFunction,
frag_footer: postFunction,
frag: funct,
multipleBuffers: true
});
}
</script>
<script>
(function(i,s,o,g,r,a,m){i["GoogleAnalyticsObject"]=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,"script","//www.google-analytics.com/analytics.js","ga");
ga("create", "UA-18824436-2", "auto");
ga("send", "pageview");
</script>
</html>