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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Origami Simulator</title>

    <link href="dependencies/bootstrap.min.css" rel="stylesheet" type="text/css"/>
    <link rel="stylesheet" type="text/css" href="dependencies/flat-ui.min.css"/>
    <link rel="stylesheet" type="text/css" href="dependencies/jquery-ui.min.css"/>
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    <link rel="stylesheet" type="text/css" href="css/nav.css"/>
    <link rel="stylesheet" type="text/css" href="css/main.css"/>
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    <script id="vertexShader" type="x-shader/x-vertex">
        attribute vec2 a_position;
        void main() {
           gl_Position = vec4(a_position, 0, 1);
        }
    </script>

    <script id="packToBytesShader" type="x-shader/x-fragment">
        precision mediump float;
        uniform vec2 u_floatTextureDim;
        uniform sampler2D u_floatTexture;
        uniform float u_vectorLength;
        float shift_right (float v, float amt) {
            v = floor(v) + 0.5;
            return floor(v / exp2(amt));
        }
        float shift_left (float v, float amt) {
            return floor(v * exp2(amt) + 0.5);
        }
        float mask_last (float v, float bits) {
            return mod(v, shift_left(1.0, bits));
        }
        float extract_bits (float num, float from, float to) {
            from = floor(from + 0.5); to = floor(to + 0.5);
            return mask_last(shift_right(num, from), to - from);
        }
        vec4 encode_float (float val) {
            if (val == 0.0) return vec4(0, 0, 0, 0);
            float sign = val > 0.0 ? 0.0 : 1.0;
            val = abs(val);
            float exponent = floor(log2(val));
            float biased_exponent = exponent + 127.0;
            float fraction = ((val / exp2(exponent)) - 1.0) * 8388608.0;
            float t = biased_exponent / 2.0;
            float last_bit_of_biased_exponent = fract(t) * 2.0;
            float remaining_bits_of_biased_exponent = floor(t);
            float byte4 = extract_bits(fraction, 0.0, 8.0) / 255.0;
            float byte3 = extract_bits(fraction, 8.0, 16.0) / 255.0;
            float byte2 = (last_bit_of_biased_exponent * 128.0 + extract_bits(fraction, 16.0, 23.0)) / 255.0;
            float byte1 = (sign * 128.0 + remaining_bits_of_biased_exponent) / 255.0;
            return vec4(byte4, byte3, byte2, byte1);
        }
        void main(){
            vec2 fragCoord = gl_FragCoord.xy;
            float textureXcoord = floor((fragCoord.x - 0.5)/u_vectorLength+0.0001) + 0.5;
            vec4 data = texture2D(u_floatTexture, vec2(textureXcoord, fragCoord.y)/u_floatTextureDim);
            int textureIndex = int(floor(mod(fragCoord.x-0.5+0.0001, u_vectorLength)));
            if (textureIndex == 0) gl_FragColor = encode_float(data[0]);
            else if (textureIndex == 1) gl_FragColor = encode_float(data[1]);
            else if (textureIndex == 2) gl_FragColor = encode_float(data[2]);
            else if (textureIndex == 3) gl_FragColor = encode_float(data[3]);
        }
    </script>

    <script id="zeroTexture" type="x-shader/x-fragment">
        void main(){
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            gl_FragColor = vec4(0.0);
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        }
    </script>

    <script id="positionCalcShader" type="x-shader/x-fragment">
        precision mediump float;
        uniform vec2 u_textureDim;
        uniform float u_dt;
        uniform sampler2D u_lastPosition;
        uniform sampler2D u_velocity;
        uniform sampler2D u_mass;

        void main(){
            vec2 fragCoord = gl_FragCoord.xy;
            vec2 scaledFragCoord = fragCoord/u_textureDim;

            float isFixed = texture2D(u_mass, scaledFragCoord).y;
            if (isFixed == 1.0){
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                gl_FragColor = vec4(0.0);
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                return;
            }

            vec3 lastPosition = texture2D(u_lastPosition, scaledFragCoord).xyz;
            vec3 velocity = texture2D(u_velocity, scaledFragCoord).xyz;
            vec3 position = velocity*u_dt + lastPosition;
            gl_FragColor = vec4(position,0.0);
        }
    </script>

    <script id="velocityCalcShader" type="x-shader/x-fragment">
        precision mediump float;
        uniform vec2 u_textureDim;
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        uniform vec2 u_textureDimEdges;
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        uniform vec2 u_textureDimFaces;
        uniform vec2 u_textureDimCreases;
        uniform vec2 u_textureDimNodeCreases;
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        uniform float u_creasePercent;
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        uniform float u_dt;
        uniform sampler2D u_lastPosition;
        uniform sampler2D u_lastVelocity;
        uniform sampler2D u_originalPosition;
        uniform sampler2D u_externalForces;
        uniform sampler2D u_mass;
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        uniform sampler2D u_meta;//[beamsIndex, numBeam, creaseMeta2Index, numCreases]
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        uniform sampler2D u_beamMeta;//[k, d, length, otherNodeIndex]
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        uniform sampler2D u_creaseMeta;//[k, d, targetTheta]
        uniform sampler2D u_creaseMeta2;//[creaseIndex, momentArmLength, nodeIndex]
        uniform sampler2D u_normals;
        uniform sampler2D u_theta;//[theta, z, normal1Index, normal2Index]
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        void main(){
            vec2 fragCoord = gl_FragCoord.xy;
            vec2 scaledFragCoord = fragCoord/u_textureDim;

            vec2 mass = texture2D(u_mass, scaledFragCoord).xy;
            if (mass.y == 1.0){
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                gl_FragColor = vec4(0.0);
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                return;
            }
            vec3 force = texture2D(u_externalForces, scaledFragCoord).xyz;
            vec3 lastPosition = texture2D(u_lastPosition, scaledFragCoord).xyz;
            vec3 lastVelocity = texture2D(u_lastVelocity, scaledFragCoord).xyz;
            vec3 originalPosition = texture2D(u_originalPosition, scaledFragCoord).xyz;

            vec4 neighborIndices = texture2D(u_meta, scaledFragCoord);
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            vec4 meta = texture2D(u_meta, scaledFragCoord);
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            for (int j=0;j<100;j++){//for all beams (up to 100, had to put a const int in here)
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                if (j >= int(meta[1])) break;

                float beamIndex1D = meta[0]+float(j);
                vec2 beamIndex = vec2(mod(beamIndex1D, u_textureDimEdges.x)+0.5, floor(beamIndex1D/u_textureDimEdges.x)+0.5);
                vec2 scaledBeamIndex = beamIndex/u_textureDimEdges;
                vec4 beamMeta = texture2D(u_beamMeta, scaledBeamIndex);

                float neighborIndex1D = beamMeta[3];
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                vec2 neighborIndex = vec2(mod(neighborIndex1D, u_textureDim.x)+0.5, floor(neighborIndex1D/u_textureDim.x)+0.5);
                vec2 scaledNeighborIndex = neighborIndex/u_textureDim;
                vec3 neighborLastPosition = texture2D(u_lastPosition, scaledNeighborIndex).xyz;
                vec3 neighborLastVelocity = texture2D(u_lastVelocity, scaledNeighborIndex).xyz;
                vec3 neighborOriginalPosition = texture2D(u_originalPosition, scaledNeighborIndex).xyz;

                vec3 nominalDist = neighborOriginalPosition-originalPosition;
                vec3 deltaP = neighborLastPosition-lastPosition+nominalDist;
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                deltaP -= normalize(deltaP)*beamMeta[2];
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                vec3 deltaV = neighborLastVelocity-lastVelocity;
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                vec3 _force = deltaP*beamMeta[0] + deltaV*beamMeta[1];
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                force += _force;
            }
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            for (int j=0;j<100;j++){//for all creases (up to 100, had to put a const int in here)
                if (j >= int(meta[3])) break;

                float nodeCreaseIndex1D = meta[2]+float(j);
                vec2 nodeCreaseIndex = vec2(mod(nodeCreaseIndex1D, u_textureDimNodeCreases.x)+0.5, floor(nodeCreaseIndex1D/u_textureDimNodeCreases.x)+0.5);
                vec2 scaledNodeCreaseIndex = nodeCreaseIndex/u_textureDimNodeCreases;
                vec4 creaseMeta2 = texture2D(u_creaseMeta2, scaledNodeCreaseIndex);

                float creaseIndex1D = creaseMeta2[0];
                vec2 creaseIndex = vec2(mod(creaseIndex1D, u_textureDimCreases.x)+0.5, floor(creaseIndex1D/u_textureDimCreases.x)+0.5);
                vec2 scaledCreaseIndex = creaseIndex/u_textureDimCreases;

                vec4 thetas = texture2D(u_theta, scaledCreaseIndex);
                vec3 creaseMeta = texture2D(u_creaseMeta, scaledCreaseIndex).xyz;//[k, d, targetTheta]

                float nodeNum = creaseMeta2[2];
                float normalIndex1D = thetas[2];
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                float targetTheta = creaseMeta[2] *= u_creasePercent;
                if (nodeNum > 1.1) {
                    normalIndex1D = thetas[3];
                }
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                vec2 normalsIndex = vec2(mod(normalIndex1D, u_textureDimFaces.x)+0.5, floor(normalIndex1D/u_textureDimFaces.x)+0.5);
                vec2 scaledNormalsIndex = normalsIndex/u_textureDimFaces;
                vec3 normal = texture2D(u_normals, scaledNormalsIndex).xyz;
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                float angForce = creaseMeta[0]*(targetTheta-thetas[0]) + creaseMeta[1]*thetas[1];;
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                float momentArm = creaseMeta2[1];

                vec3 _force = angForce/momentArm*normal;
                force += _force;
            }
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            vec3 velocity = force*u_dt/mass.x + lastVelocity;
            gl_FragColor = vec4(velocity,0.0);
        }
    </script>
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    <script id="thetaCalcShader" type="x-shader/x-fragment">
        precision mediump float;
        uniform vec2 u_textureDimFaces;
        uniform vec2 u_textureDimCreases;
        uniform sampler2D u_normals;
        uniform sampler2D u_lastTheta;
        uniform sampler2D u_creaseVectors;

        void main(){

            vec2 fragCoord = gl_FragCoord.xy;
            vec2 scaledFragCoord = fragCoord/u_textureDimCreases;

            vec4 lastTheta = texture2D(u_lastTheta, scaledFragCoord);

            if (lastTheta[2]<0.0){
                gl_FragColor = vec4(0.0, 0.0, -1.0, -1.0);
                return;
            }

            vec2 normal1Index = vec2(mod(lastTheta[2], u_textureDimFaces.x)+0.5, floor(lastTheta[2]/u_textureDimFaces.x)+0.5);
            normal1Index /= u_textureDimFaces;
            vec2 normal2Index = vec2(mod(lastTheta[3], u_textureDimFaces.x)+0.5, floor(lastTheta[3]/u_textureDimFaces.x)+0.5);
            normal2Index /= u_textureDimFaces;

            vec3 normal1 = texture2D(u_normals, normal1Index).xyz;
            vec3 normal2 = texture2D(u_normals, normal2Index).xyz;

            float theta = acos(dot(normal1, normal2));//normals are already normalized, no need to divide by length
            vec3 creaseVector = texture2D(u_creaseVectors, scaledFragCoord).xyz;
            float sign = dot(cross(normal1, normal2), creaseVector);
            if (sign < 0.0) theta *= -1.0;
            gl_FragColor = vec4(theta, theta-lastTheta[0], lastTheta[2], lastTheta[3]);//[theta, w, normal1Index, normal2Index]
        }
    </script>
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    <script type="text/javascript" src="dependencies/jquery-3.1.1.min.js"></script>
    <script type="text/javascript" src="dependencies/jquery-ui.min.js"></script>
    <script type="text/javascript" src="dependencies/flat-ui.min.js"></script>
    <script type="text/javascript" src="dependencies/three.min.js"></script>
    <script type="text/javascript" src="dependencies/binary_stl_writer.js"></script>
    <script type="text/javascript" src="dependencies/OrbitControls.js"></script>
    <script type="text/javascript" src="dependencies/underscore-min.js"></script>
    <script type="text/javascript" src="dependencies/FileSaver.min.js"></script>
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    <script type="text/javascript" src="dependencies/SVGLoader.js"></script>
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    <script type="text/javascript" src="dependencies/path-data-polyfill.js"></script>
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    <script type="text/javascript" src="dependencies/earcut.js"></script>
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    <script type="text/javascript" src="js/GLBoilerplate.js"></script>
    <script type="text/javascript" src="js/GPUMath.js"></script>
    <script type="text/javascript" src="js/controls.js"></script>
    <script type="text/javascript" src="js/threeView.js"></script>
    <script type="text/javascript" src="js/globals.js"></script>
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    <script type="text/javascript" src="js/node.js"></script>
    <script type="text/javascript" src="js/beam.js"></script>
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    <script type="text/javascript" src="js/crease.js"></script>
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    <script type="text/javascript" src="js/model.js"></script>
    <script type="text/javascript" src="js/dynamicModel.js"></script>
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    <script type="text/javascript" src="js/pattern.js"></script>
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    <script type="text/javascript" src="js/main.js"></script>
</head>
<body>
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<nav id="globalNav" class="navbar navbar-inverse navbar-embossed" role="navigation">
    <div class="navbar-header">
        <a id="logo" class="navbar-brand" target="_blank" href="http://cba.mit.edu/">
            <img id="inactiveLogo" src="logo.png"/>
            <img id="activeLogo" src="logo-active.png"/>
        </a>
    </div>
    <div class="collapse navbar-collapse" id="navbar-collapse-01">
        <ul class="nav navbar-nav navbar-left">
            <li class="dropdown navDropdown">
                <a href="#" class="dropdown-toggle" data-toggle="dropdown">File <b class="caret"></b></a>
                <span class="dropdown-arrow"></span>
                <ul class="dropdown-menu">
                    <li><a class="loadFile" href="#">Import SVG...</a></li>
                    <li class="divider"></li>
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                    <li><a id="saveSVG" href="#">Save Pattern as SVG...</a></li>
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                    <li><a id="exportSTL" href="#">Save Simulation as STL...</a></li>
                </ul>
            </li>
            <li><a data-menu-id="navDesign" class="menuHoverControls" href="#">Pattern</a></li>
            <li><a data-menu-id="navSim" class="menuHoverControls" href="#">Simulation</a></li>
            <!--<li class="dropdown navDropdown">-->
                <!--<a href="#" class="dropdown-toggle" id="viewMenuDropdown" data-toggle="dropdown">View <b class="caret"></b></a>-->
                <!--<span class="dropdown-arrow"></span>-->
                <!--<ul id="navViewMenu" class="dropdown-menu">-->
                    <!--<li><a href="#">thing1</a></li>-->
                    <!--<li><a href="#">things2</a></li>-->
                <!--</ul>-->
            <!--</li>-->
            <li><a id="about" class="menuHoverControls" target="_blank" href="#">About</a></li>
        </ul>

    </div><!-- /.navbar-collapse -->
    <input id="fileSelector" type="file">

</nav>
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<div  id="threeContainer"></div>
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<canvas id="gpuMathCanvas"></canvas>
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<div id="controlsLeft" class="flipped">
    <div>
        3D View:
        <div class="indent">
            <label class="checkbox" for="dynamic">
                <input id="dynamic" data-toggle="checkbox" class="custom-checkbox layersSelector" type="checkbox"><span class="icons"><span class="icon-unchecked"></span><span class="icon-checked"></span></span>
                Dynamic Simulation
            </label>
            <label class="checkbox" for="static">
                <input id="static" data-toggle="checkbox" class="custom-checkbox layersSelector" type="checkbox"><span class="icons"><span class="icon-unchecked"></span><span class="icon-checked"></span></span>
                Static Simulation
            </label>
            <label class="checkbox" for="schematic">
                <input id="schematic" data-toggle="checkbox" class="custom-checkbox layersSelector" type="checkbox"><span class="icons"><span class="icon-unchecked"></span><span class="icon-checked"></span></span>
                Crease Pattern
            </label>
        </div>
    </div>
    <br/><br/>
    <div class="dynamicSim">
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        <div class="paddingBottom">Dynamic Sim Settings:</div>
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        <div class="indent">
            <div class="sliderContainer">
                <span class="label-slider">Damping : </span><div id="damping"  class="flat-slider ui-slider ui-corner-all ui-slider-horizontal ui-widget ui-widget-content"></div><br/>
            </div>
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            <a href="#" id="resetDynamicSim" class="paddingBottom btn btn-lg btn-default">Replay Dynamic Simulation</a>
            <div>&Delta; t = <span id="deltaT"></span> seconds</div>
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        </div>
    </div>
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    <div class="extraSpace"></div>
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</div>
<div id="controls">
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    <div class="sliderInput" id="creasePercent">
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        <span class="label-slider">Crease Angle : </span><div class="flat-slider ui-slider ui-corner-all ui-slider-horizontal ui-widget ui-widget-content"></div>
        <input value="" placeholder="" class="form-control int" type="text">
    </div>
    <br/><br/><br/>
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    <div class="sliderInput" id="axialStiffness">
        <span class="label-slider">Axial Stiffness : </span><div class="flat-slider ui-slider ui-corner-all ui-slider-horizontal ui-widget ui-widget-content"></div>
        <input value="" placeholder="" class="form-control int" type="text">
    </div>
    <div class="sliderInput" id="creaseStiffness">
        <span class="label-slider">Crease Stiffness : </span><div class="flat-slider ui-slider ui-corner-all ui-slider-horizontal ui-widget ui-widget-content"></div>
        <input value="" placeholder="" class="form-control int" type="text">
    </div>
    <div class="sliderInput" id="panelStiffness">
        <span class="label-slider">Panel Stiffness : </span><div class="flat-slider ui-slider ui-corner-all ui-slider-horizontal ui-widget ui-widget-content"></div>
        <input value="" placeholder="" class="form-control int" type="text">
    </div>
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                <p><b>Origami Simulator</b><br/><br/>
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                    http://www2.eng.cam.ac.uk/~sdg/preprint/5OSME.pdf
                    http://origami.c.u-tokyo.ac.jp/~tachi/cg/SimulationOfRigidOrigami_tachi_4OSME.pdf
                    https://github.com/mapbox/earcut

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                Built by <a href="http://www.amandaghassaei.com/" target="_blank">Amanda Ghassaei</a> as a homework assignment for <a href="http://courses.csail.mit.edu/6.849/spring17/" target="_blank">Geometric Folding Algorithms</a>.
                Code available on <a href="https://github.com/amandaghassaei/OrigamiSimulator" target="_blank">Github</a>.
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