Full Code of rreusser/glsl-solid-wireframe for AI

Repository: rreusser/glsl-solid-wireframe
Branch: master
Commit: 9ce770c39a4f
Files: 14
Total size: 1.9 MB

Directory structure:
gitextract_lxwuiylt/

├── .npmignore
├── README.md
├── barycentric/
│   ├── scaled.glsl
│   └── unscaled.glsl
├── cartesian/
│   ├── scaled.glsl
│   └── unscaled.glsl
├── docs/
│   ├── barycentric.html
│   ├── cartesian.html
│   └── demo.html
├── examples/
│   ├── barycentric.js
│   ├── cartesian.js
│   └── demo.js
├── index.js
└── package.json

================================================
FILE CONTENTS
================================================

================================================
FILE: .npmignore
================================================
examples
test
docs


================================================
FILE: README.md
================================================
# glsl-solid-wireframe

> draw wireframes on a triangular mesh using a fragment shader

This module uses barycentric coordinates to draw a wireframe on a solid triangular mesh. Alternatively, it will simply draw grid lines at integer component values of a float- or vector-valued variable which you give it.

You can see a detailed explanation of the technique [here](http://codeflow.org/entries/2012/aug/02/easy-wireframe-display-with-barycentric-coordinates/). It uses [`OES_standard_derivatives`](https://www.khronos.org/registry/gles/extensions/OES/OES_standard_derivatives.txt) to scale the lines to a uniform width, but also exposes a basic fallback that scales lines relative to the size of the triangle in case `OES_standard_derivatives` is not available. (The fallback is pretty bad.) [Support for `OES_standard_derivatives` is 96% for mobile and 99% across the board](http://webglstats.com/webgl/extension/OES_standard_derivatives).

Please ***do not*** confuse it with nVidia's [Solid Wireframe technique](http://developer.download.nvidia.com/SDK/10/direct3d/Source/SolidWireframe/Doc/SolidWireframe.pdf). That technique uses a geometry shader so will not be available in WebGL any time soon. The convenience function used here to generate barycentric coordinates produces a similar result but duplicates and expands the geometry to achieve it. It's real wasteful. Not perfect.

## Example

<p align="center">
  <a href="http://rreusser.github.io/glsl-solid-wireframe/barycentric.html">
    <img src="docs/images/barycentric.png" width="200">
  </a>
  <br>
  Barycentric coordinate based mesh. <a href="http://rreusser.github.io/glsl-solid-wireframe/barycentric.html">See demo &rarr;</a>
</p>

<p align="center">
  <a href="http://rreusser.github.io/glsl-solid-wireframe/cartesian.html">
    <img src="docs/images/cartesian.png" width="200">
  </a>
  <br>
  Cartesian coordinate based mesh using <code>5 * position.xy</code> as the input. <a href="http://rreusser.github.io/glsl-solid-wireframe/cartesian.html">See demo &rarr;</a>
</p>

Or see an interactive demo [here](http://rreusser.github.io/glsl-solid-wireframe/demo.html). Code using [regl](https://github.com/regl-project/regl) to draw a barycentric triangular mesh is below.

```javascript
const regl = require('regl')({extensions: ['oes_standard_derivatives']});
const glsl = require('glslify');
const camera = require('regl-camera')(regl);
const mesh = require('glsl-solid-wireframe')(require('bunny'));

const draw = regl({
  frag: glsl`
    #extension GL_OES_standard_derivatives : enable
    precision mediump float;
    #pragma glslify: grid = require(glsl-solid-wireframe/barycentric/scaled)
    varying vec2 b;
    void main () {
      gl_FragColor = vec4(vec3(grid(b, 1.0)), 1);
    }
  `,
  vert: `
    precision mediump float;
    uniform mat4 projection, view;
    attribute vec3 position;
    attribute vec2 barycentric;
    varying vec2 b;
    void main () {
      b = barycentric;
      gl_Position = projection * view * vec4(position, 1);
    }
  `,
  attributes: {
    position: mesh.positions,
    barycentric: mesh.barycentric
  },
  elements: mesh.cells,
});

regl.frame(() => {
  regl.clear({color: [1, 1, 1, 1], depth: 1});
  camera(draw);
});
```

## API

### Installation

```bash
$ npm install glsl-solid-wireframe
```

### JavaScript API

In order to use the barycentric wireframe shader, each triangle must have a `vec2` vertex attribute that is `[0, 0]` in one corner, `[1, 0]` in the second, and `[0, 1]` in the third. Since assigning these attributes without duplicating the mesh is not a straightforward assignment problem, the module exports a function that simply expands the mesh and assigns the proper attributes. The extra storage may be prohibitive, but you certainly don't need to use this convenience function in order to use the shaders. You may be able to do better (PR welcome!) or barycentric coordinate assignment may simply be trivial for your geometry.

### var wmesh = require('glsl-solid-wireframe')(mesh[, opts = {}])

Create a wireframe mesh given an existing triangular mesh.

The input must be a simplicial complex consisting of `positions` and `cells`.

The wireframe mesh has these properties:
- `wmesh.positions`: an array of `[x, y, z]` vertex arrays
- `wmesh.cells`: an array of triangle indices
- `wmesh.attributes`: extra attributes transferred from the input. See below.

You may optionally provide `opts.attributes`. If you do, the attribute references will be copied for each element into a new list of vertex attribute arrays.

### glslify API

To require the modules via [glslify](https://github.com/stackgl/glslify):

```glsl
#pragma glslify bary_wire_scaled = require(glsl-solid-wireframe/barycentric/scaled)
#pragma glslify bary_wire_unscaled = require(glsl-solid-wireframe/barycentric/unscaled)
#pragma glslify cart_wire_scaled = require(glsl-solid-wireframe/cartesian/scaled)
#pragma glslify cart_wire_unscaled = require(glsl-solid-wireframe/cartesian/unscaled)
```

#### `float bary_wire_scaled(vec2 b, float width[, float feather = 0.5])`

Returns 0.0 on the grid lines and 1.0 on the rest of the triangle. `b` is the `varying vec2` barycentric coordinate, `width` is the width of the grid lines in pixels, and `feather` is the radius on either side of `width` over which to transition in order to avoid sharp aliasing. `feather` must be strictly greater than zero to avoid inequality fighting issues with `smoothstep`. In order to use this shader, `OES_standard_derivatives` must be available so this function is only available in a fragment shader.

#### `float bary_wire_unscaled(vec2 b, float width[, float feather = 0.5])`

Returns 0.0 on the grid lines and 1.0 on the rest of the triangle. `b` is the `varying vec2` barycentric coordinate, `width` is the width of the grid lines where `0.0` shows no lines at all and `1.0` causes all three lines to meet in the center, and `feather` is the radius on either side of `width` over which to transition in order to avoid sharp aliasing. `feather` must be strictly greater than zero to avoid inequality fighting issues with `smoothstep`. This shader does not use `OES_standard_derivatives`.

#### `float cart_wire_scaled(genType f, float width[, float feather = 0.5])`

Returns 0.0 on the grid lines and 1.0 on the rest of the triangle. `f` is a `float`, `vec2`, `vec3`, or `vec4`. Grid lines will appear at integer values of any of the components. `width` is the width of the grid lines in pixels, and `feather` is the radius on either side of `width` over which to transition in order to avoid sharp aliasing. `feather` must be strictly greater than zero to avoid inequality fighting issues with `smoothstep`. In order to use this shader, `OES_standard_derivatives` must be available so that this is only available in a fragment shader.

#### `float cart_wire_unscaled(genType f, float width[, float feather = 0.5])`

Returns 0.0 on the grid lines and 1.0 on the rest of the triangle. `f` is a `float`, `vec2`, `vec3`, or `vec4`. Grid lines will appear at integer values of any of components. `width` is the width of the grid lines where `0.0` shows no lines at all and `1.0` causes all three lines to meet in the center, and `feather` is the radius on either side of `width` over which to transition in order to avoid sharp aliasing. `feather` must be strictly greater than zero to avoid inequality fighting issues with `smoothstep`. This shader does not use `OES_standard_derivatives`.

## See also

- [screen-projected-lines](https://github.com/substack/screen-projected-lines)

## License
&copy; Ricky Reusser 2016. MIT License.


================================================
FILE: barycentric/scaled.glsl
================================================
float gridFactor (vec2 vBC, float width, float feather) {
  float w1 = width - feather * 0.5;
  vec3 bary = vec3(vBC.x, vBC.y, 1.0 - vBC.x - vBC.y);
  vec3 d = fwidth(bary);
  vec3 a3 = smoothstep(d * w1, d * (w1 + feather), bary);
  return min(min(a3.x, a3.y), a3.z);
}

float gridFactor (vec2 vBC, float width) {
  vec3 bary = vec3(vBC.x, vBC.y, 1.0 - vBC.x - vBC.y);
  vec3 d = fwidth(bary);
  vec3 a3 = smoothstep(d * (width - 0.5), d * (width + 0.5), bary);
  return min(min(a3.x, a3.y), a3.z);
}

#pragma glslify: export(gridFactor)


================================================
FILE: barycentric/unscaled.glsl
================================================
float gridFactor (vec2 vBC, float width, float feather) {
  vec3 bary = vec3(vBC.x, vBC.y, 1.0 - vBC.x - vBC.y) * 3.0;
  vec3 a3 = smoothstep(vec3(width - feather), vec3(width + feather), bary);
  return min(min(a3.x, a3.y), a3.z);
}

float gridFactor (vec2 vBC, float width) {
  vec3 bary = vec3(vBC.x, vBC.y, 1.0 - vBC.x - vBC.y) * 3.0;
  vec3 a3 = smoothstep(vec3(width - 0.05), vec3(width + 0.05), bary);
  return min(min(a3.x, a3.y), a3.z);
}

#pragma glslify: export(gridFactor)


================================================
FILE: cartesian/scaled.glsl
================================================
float gridFactor (float parameter, float width, float feather) {
  float w1 = width - feather * 0.5;
  float d = fwidth(parameter);
  float looped = 0.5 - abs(mod(parameter, 1.0) - 0.5);
  return smoothstep(d * w1, d * (w1 + feather), looped);
}

float gridFactor (vec2 parameter, float width, float feather) {
  float w1 = width - feather * 0.5;
  vec2 d = fwidth(parameter);
  vec2 looped = 0.5 - abs(mod(parameter, 1.0) - 0.5);
  vec2 a2 = smoothstep(d * w1, d * (w1 + feather), looped);
  return min(a2.x, a2.y);
}

float gridFactor (vec3 parameter, float width, float feather) {
  float w1 = width - feather * 0.5;
  vec3 d = fwidth(parameter);
  vec3 looped = 0.5 - abs(mod(parameter, 1.0) - 0.5);
  vec3 a3 = smoothstep(d * w1, d * (w1 + feather), looped);
  return min(min(a3.x, a3.y), a3.z);
}

float gridFactor (vec4 parameter, float width, float feather) {
  float w1 = width - feather * 0.5;
  vec4 d = fwidth(parameter);
  vec4 looped = 0.5 - abs(mod(parameter, 1.0) - 0.5);
  vec4 a4 = smoothstep(d * w1, d * (w1 + feather), looped);
  return min(min(min(a4.x, a4.y), a4.z), a4.w);
}

float gridFactor (float parameter, float width) {
  float d = fwidth(parameter);
  float looped = 0.5 - abs(mod(parameter, 1.0) - 0.5);
  return smoothstep(d * (width - 0.5), d * (width + 0.5), looped);
}

float gridFactor (vec2 parameter, float width) {
  vec2 d = fwidth(parameter);
  vec2 looped = 0.5 - abs(mod(parameter, 1.0) - 0.5);
  vec2 a2 = smoothstep(d * (width - 0.5), d * (width + 0.5), looped);
  return min(a2.x, a2.y);
}

float gridFactor (vec3 parameter, float width) {
  vec3 d = fwidth(parameter);
  vec3 looped = 0.5 - abs(mod(parameter, 1.0) - 0.5);
  vec3 a3 = smoothstep(d * (width - 0.5), d * (width + 0.5), looped);
  return min(min(a3.x, a3.y), a3.z);
}

float gridFactor (vec4 parameter, float width) {
  vec4 d = fwidth(parameter);
  vec4 looped = 0.5 - abs(mod(parameter, 1.0) - 0.5);
  vec4 a4 = smoothstep(d * (width - 0.5), d * (width + 0.5), looped);
  return min(min(min(a4.x, a4.y), a4.z), a4.z);
}

#pragma glslify: export(gridFactor)


================================================
FILE: cartesian/unscaled.glsl
================================================
float gridFactor (float parameter, float width, float feather) {
  float l = 1.0 - 2.0 * abs(mod(parameter, 1.0) - 0.5);
  return smoothstep(width - feather, width + feather, l);
}

float gridFactor (vec2 parameter, float width, float feather) {
  vec2 l = 1.0 - 2.0 * abs(mod(parameter, 1.0) - 0.5);
  vec2 a2 = smoothstep(width - feather, width + feather, l);
  return min(a2.x, a2.y);
}

float gridFactor (vec3 parameter, float width, float feather) {
  vec3 l = 1.0 - 2.0 * abs(mod(parameter, 1.0) - 0.5);
  vec3 a3 = smoothstep(width - feather, width + feather, l);
  return min(min(a3.x, a3.y), a3.z);
}

float gridFactor (vec4 parameter, float width, float feather) {
  vec4 l = 1.0 - 2.0 * abs(mod(parameter, 1.0) - 0.5);
  vec4 a4 = smoothstep(width - feather, width + feather, l);
  return min(min(min(a4.x, a4.y), a4.z), a4.w);
}

float gridFactor (float parameter, float width) {
  float l = 1.0 - 2.0 * abs(mod(parameter, 1.0) - 0.5);
  return smoothstep(width - 0.05, width + 0.05, l);
}

float gridFactor (vec2 parameter, float width) {
  vec2 l = 1.0 - 2.0 * abs(mod(parameter, 1.0) - 0.5);
  vec2 a2 = smoothstep(width - 0.05, width + 0.05, l);
  return min(a2.x, a2.y);
}

float gridFactor (vec3 parameter, float width) {
  vec3 l = 1.0 - 2.0 * abs(mod(parameter, 1.0) - 0.5);
  vec3 a3 = smoothstep(width - 0.05, width + 0.05, l);
  return min(min(a3.x, a3.y), a3.z);
}

float gridFactor (vec4 parameter, float width) {
  vec4 l = 1.0 - 2.0 * abs(mod(parameter, 1.0) - 0.5);
  vec4 a4 = smoothstep(width - 0.05, width + 0.05, l);
  return min(min(min(a4.x, a4.y), a4.z), a4.w);
}

#pragma glslify: export(gridFactor)


================================================
FILE: docs/barycentric.html
================================================
<!DOCTYPE html>
<html>
<head>
<title>glsl-solid-wireframe</title>
<meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport" />
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<body><a href="https://github.com/rreusser/glsl-solid-wireframe" class="github-corner" aria-label="View source on Github"><svg xmlns="http://www.w3.org/2000/svg" width="80" height="80" viewBox="0 0 250 250" fill="#fff">
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<script>
(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
var regl = require('regl')({
  extensions: ['oes_standard_derivatives']
});
var glsl = require('glslify');
document.querySelector('canvas').addEventListener('mousewheel', function (e) {
  return e.preventDefault();
});
var camera = require('regl-camera')(regl, { distance: 15, center: [0, 4, 0], theta: 1.9, phi: 0.3 });
var mesh = require('../')(require('bunny'));

var draw = regl({
  frag: glsl(["\n    #extension GL_OES_standard_derivatives : enable\n    precision mediump float;\n#define GLSLIFY 1\n\n    float gridFactor (vec2 vBC, float width, float feather) {\n  float w1 = width - feather * 0.5;\n  vec3 bary = vec3(vBC.x, vBC.y, 1.0 - vBC.x - vBC.y);\n  vec3 d = fwidth(bary);\n  vec3 a3 = smoothstep(d * w1, d * (w1 + feather), bary);\n  return min(min(a3.x, a3.y), a3.z);\n}\n\nfloat gridFactor (vec2 vBC, float width) {\n  vec3 bary = vec3(vBC.x, vBC.y, 1.0 - vBC.x - vBC.y);\n  vec3 d = fwidth(bary);\n  vec3 a3 = smoothstep(d * (width - 0.5), d * (width + 0.5), bary);\n  return min(min(a3.x, a3.y), a3.z);\n}\n\n    varying vec2 b;\n    void main () {\n      gl_FragColor = vec4(vec3(gridFactor(b, 1.0)), 1);\n    }\n  ", ""]),
  vert: '\n    precision mediump float;\n    uniform mat4 projection, view;\n    attribute vec3 position;\n    attribute vec2 barycentric;\n    varying vec2 b;\n    void main () {\n      b = barycentric;\n      gl_Position = projection * view * vec4(position, 1);\n    }\n  ',
  attributes: {
    position: mesh.positions,
    barycentric: mesh.barycentric
  },
  elements: mesh.cells
});

regl.frame(function () {
  regl.clear({ color: [1, 1, 1, 0], depth: 1 });
  camera(draw);
});
},{"../":2,"bunny":3,"glslify":7,"regl":13,"regl-camera":12}],2:[function(require,module,exports){
module.exports = function (mesh, opts) {
  if (!opts) opts = {};
  var vars = opts.attributes ? {} : null;
  var vkeys = vars && Object.keys(opts.attributes);
  if (vars) {
    for (var k = 0; k < vkeys.length; k++) {
      vars[vkeys[k]] = [];
    }
  }

  var i, j;
  var pts = [];
  var cells = [];
  var barycentricAttrs = [];

  var mpts = mesh.positions;
  var mcells = mesh.cells;

  var c = 0;
  for (i = 0; i < mesh.cells.length; i++) {
    var cell = mcells[i];
    if (cell.length === 3) {
      pts.push(mpts[cell[0]]);
      pts.push(mpts[cell[1]]);
      pts.push(mpts[cell[2]]);
      barycentricAttrs.push([0, 0]);
      barycentricAttrs.push([1, 0]);
      barycentricAttrs.push([0, 1]);
      cells.push(c++);
      cells.push(c++);
      cells.push(c++);
      if (vkeys) {
        for (j = 0; j < vkeys.length; j++) {
          var vkey = vkeys[j];
          vars[vkey].push(opts.attributes[vkey][cell[0]]);
          vars[vkey].push(opts.attributes[vkey][cell[1]]);
          vars[vkey].push(opts.attributes[vkey][cell[2]]);
        }
      }
    }
  }

  var ret = {
    positions: pts,
    attributes: vars,
    barycentric: barycentricAttrs
  };

  if (mesh.cells) {
    ret.cells = cells;
  }

  return ret;
};
},{}],3:[function(require,module,exports){
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835,1808,1820],[603,570,1822],[226,1070,1778],[1013,1181,1179],[1721,679,1664],[1717,1813,1811],[1828,1827,1815],[22,1820,23],[22,1835,1820],[1830,603,1821],[719,1659,5],[643,567,1657],[1717,794,739],[1825,1826,1824],[1828,1815,1826],[1829,21,1818],[1808,1835,13],[4,719,5],[10,1662,1715],[1828,1832,1827],[1832,1818,1827],[12,1833,1816],[1833,1821,1816],[1833,1830,1821],[14,1146,1701],[1186,1829,1818],[1280,603,1830],[14,1700,1146],[1667,1728,1130],[1825,1834,1826],[1834,1828,1826],[1832,1186,1818],[1836,13,1835],[1624,1711,1570],[778,1624,1570],[1719,1725,1721],[1002,1825,1831],[1002,1834,1825],[1834,1832,1828],[1186,21,1829],[1836,1835,22],[1837,1833,12],[1280,1830,1833],[1667,1275,1728],[16,1767,1084],[589,1765,1838],[1765,1781,1838],[1781,1737,1838],[1737,982,1838],[982,1053,1838],[1053,816,1838],[816,589,1838]]

},{}],4:[function(require,module,exports){
module.exports = identity;

/**
 * Set a mat4 to the identity matrix
 *
 * @param {mat4} out the receiving matrix
 * @returns {mat4} out
 */
function identity(out) {
    out[0] = 1;
    out[1] = 0;
    out[2] = 0;
    out[3] = 0;
    out[4] = 0;
    out[5] = 1;
    out[6] = 0;
    out[7] = 0;
    out[8] = 0;
    out[9] = 0;
    out[10] = 1;
    out[11] = 0;
    out[12] = 0;
    out[13] = 0;
    out[14] = 0;
    out[15] = 1;
    return out;
};
},{}],5:[function(require,module,exports){
var identity = require('./identity');

module.exports = lookAt;

/**
 * Generates a look-at matrix with the given eye position, focal point, and up axis
 *
 * @param {mat4} out mat4 frustum matrix will be written into
 * @param {vec3} eye Position of the viewer
 * @param {vec3} center Point the viewer is looking at
 * @param {vec3} up vec3 pointing up
 * @returns {mat4} out
 */
function lookAt(out, eye, center, up) {
    var x0, x1, x2, y0, y1, y2, z0, z1, z2, len,
        eyex = eye[0],
        eyey = eye[1],
        eyez = eye[2],
        upx = up[0],
        upy = up[1],
        upz = up[2],
        centerx = center[0],
        centery = center[1],
        centerz = center[2];

    if (Math.abs(eyex - centerx) < 0.000001 &&
        Math.abs(eyey - centery) < 0.000001 &&
        Math.abs(eyez - centerz) < 0.000001) {
        return identity(out);
    }

    z0 = eyex - centerx;
    z1 = eyey - centery;
    z2 = eyez - centerz;

    len = 1 / Math.sqrt(z0 * z0 + z1 * z1 + z2 * z2);
    z0 *= len;
    z1 *= len;
    z2 *= len;

    x0 = upy * z2 - upz * z1;
    x1 = upz * z0 - upx * z2;
    x2 = upx * z1 - upy * z0;
    len = Math.sqrt(x0 * x0 + x1 * x1 + x2 * x2);
    if (!len) {
        x0 = 0;
        x1 = 0;
        x2 = 0;
    } else {
        len = 1 / len;
        x0 *= len;
        x1 *= len;
        x2 *= len;
    }

    y0 = z1 * x2 - z2 * x1;
    y1 = z2 * x0 - z0 * x2;
    y2 = z0 * x1 - z1 * x0;

    len = Math.sqrt(y0 * y0 + y1 * y1 + y2 * y2);
    if (!len) {
        y0 = 0;
        y1 = 0;
        y2 = 0;
    } else {
        len = 1 / len;
        y0 *= len;
        y1 *= len;
        y2 *= len;
    }

    out[0] = x0;
    out[1] = y0;
    out[2] = z0;
    out[3] = 0;
    out[4] = x1;
    out[5] = y1;
    out[6] = z1;
    out[7] = 0;
    out[8] = x2;
    out[9] = y2;
    out[10] = z2;
    out[11] = 0;
    out[12] = -(x0 * eyex + x1 * eyey + x2 * eyez);
    out[13] = -(y0 * eyex + y1 * eyey + y2 * eyez);
    out[14] = -(z0 * eyex + z1 * eyey + z2 * eyez);
    out[15] = 1;

    return out;
};
},{"./identity":4}],6:[function(require,module,exports){
module.exports = perspective;

/**
 * Generates a perspective projection matrix with the given bounds
 *
 * @param {mat4} out mat4 frustum matrix will be written into
 * @param {number} fovy Vertical field of view in radians
 * @param {number} aspect Aspect ratio. typically viewport width/height
 * @param {number} near Near bound of the frustum
 * @param {number} far Far bound of the frustum
 * @returns {mat4} out
 */
function perspective(out, fovy, aspect, near, far) {
    var f = 1.0 / Math.tan(fovy / 2),
        nf = 1 / (near - far);
    out[0] = f / aspect;
    out[1] = 0;
    out[2] = 0;
    out[3] = 0;
    out[4] = 0;
    out[5] = f;
    out[6] = 0;
    out[7] = 0;
    out[8] = 0;
    out[9] = 0;
    out[10] = (far + near) * nf;
    out[11] = -1;
    out[12] = 0;
    out[13] = 0;
    out[14] = (2 * far * near) * nf;
    out[15] = 0;
    return out;
};
},{}],7:[function(require,module,exports){
module.exports = function(strings) {
  if (typeof strings === 'string') strings = [strings]
  var exprs = [].slice.call(arguments,1)
  var parts = []
  for (var i = 0; i < strings.length-1; i++) {
    parts.push(strings[i], exprs[i] || '')
  }
  parts.push(strings[i])
  return parts.join('')
}

},{}],8:[function(require,module,exports){
'use strict'

module.exports = mouseListen

var mouse = require('mouse-event')

function mouseListen (element, callback) {
  if (!callback) {
    callback = element
    element = window
  }

  var buttonState = 0
  var x = 0
  var y = 0
  var mods = {
    shift: false,
    alt: false,
    control: false,
    meta: false
  }
  var attached = false

  function updateMods (ev) {
    var changed = false
    if ('altKey' in ev) {
      changed = changed || ev.altKey !== mods.alt
      mods.alt = !!ev.altKey
    }
    if ('shiftKey' in ev) {
      changed = changed || ev.shiftKey !== mods.shift
      mods.shift = !!ev.shiftKey
    }
    if ('ctrlKey' in ev) {
      changed = changed || ev.ctrlKey !== mods.control
      mods.control = !!ev.ctrlKey
    }
    if ('metaKey' in ev) {
      changed = changed || ev.metaKey !== mods.meta
      mods.meta = !!ev.metaKey
    }
    return changed
  }

  function handleEvent (nextButtons, ev) {
    var nextX = mouse.x(ev)
    var nextY = mouse.y(ev)
    if ('buttons' in ev) {
      nextButtons = ev.buttons | 0
    }
    if (nextButtons !== buttonState ||
      nextX !== x ||
      nextY !== y ||
      updateMods(ev)) {
      buttonState = nextButtons | 0
      x = nextX || 0
      y = nextY || 0
      callback && callback(buttonState, x, y, mods)
    }
  }

  function clearState (ev) {
    handleEvent(0, ev)
  }

  function handleBlur () {
    if (buttonState ||
      x ||
      y ||
      mods.shift ||
      mods.alt ||
      mods.meta ||
      mods.control) {
      x = y = 0
      buttonState = 0
      mods.shift = mods.alt = mods.control = mods.meta = false
      callback && callback(0, 0, 0, mods)
    }
  }

  function handleMods (ev) {
    if (updateMods(ev)) {
      callback && callback(buttonState, x, y, mods)
    }
  }

  function handleMouseMove (ev) {
    if (mouse.buttons(ev) === 0) {
      handleEvent(0, ev)
    } else {
      handleEvent(buttonState, ev)
    }
  }

  function handleMouseDown (ev) {
    handleEvent(buttonState | mouse.buttons(ev), ev)
  }

  function handleMouseUp (ev) {
    handleEvent(buttonState & ~mouse.buttons(ev), ev)
  }

  function attachListeners () {
    if (attached) {
      return
    }
    attached = true

    element.addEventListener('mousemove', handleMouseMove)

    element.addEventListener('mousedown', handleMouseDown)

    element.addEventListener('mouseup', handleMouseUp)

    element.addEventListener('mouseleave', clearState)
    element.addEventListener('mouseenter', clearState)
    element.addEventListener('mouseout', clearState)
    element.addEventListener('mouseover', clearState)

    element.addEventListener('blur', handleBlur)

    element.addEventListener('keyup', handleMods)
    element.addEventListener('keydown', handleMods)
    element.addEventListener('keypress', handleMods)

    if (element !== window) {
      window.addEventListener('blur', handleBlur)

      window.addEventListener('keyup', handleMods)
      window.addEventListener('keydown', handleMods)
      window.addEventListener('keypress', handleMods)
    }
  }

  function detachListeners () {
    if (!attached) {
      return
    }
    attached = false

    element.removeEventListener('mousemove', handleMouseMove)

    element.removeEventListener('mousedown', handleMouseDown)

    element.removeEventListener('mouseup', handleMouseUp)

    element.removeEventListener('mouseleave', clearState)
    element.removeEventListener('mouseenter', clearState)
    element.removeEventListener('mouseout', clearState)
    element.removeEventListener('mouseover', clearState)

    element.removeEventListener('blur', handleBlur)

    element.removeEventListener('keyup', handleMods)
    element.removeEventListener('keydown', handleMods)
    element.removeEventListener('keypress', handleMods)

    if (element !== window) {
      window.removeEventListener('blur', handleBlur)

      window.removeEventListener('keyup', handleMods)
      window.removeEventListener('keydown', handleMods)
      window.removeEventListener('keypress', handleMods)
    }
  }

  // Attach listeners
  attachListeners()

  var result = {
    element: element
  }

  Object.defineProperties(result, {
    enabled: {
      get: function () { return attached },
      set: function (f) {
        if (f) {
          attachListeners()
        } else {
          detachListeners()
        }
      },
      enumerable: true
    },
    buttons: {
      get: function () { return buttonState },
      enumerable: true
    },
    x: {
      get: function () { return x },
      enumerable: true
    },
    y: {
      get: function () { return y },
      enumerable: true
    },
    mods: {
      get: function () { return mods },
      enumerable: true
    }
  })

  return result
}

},{"mouse-event":9}],9:[function(require,module,exports){
'use strict'

function mouseButtons(ev) {
  if(typeof ev === 'object') {
    if('buttons' in ev) {
      return ev.buttons
    } else if('which' in ev) {
      var b = ev.which
      if(b === 2) {
        return 4
      } else if(b === 3) {
        return 2
      } else if(b > 0) {
        return 1<<(b-1)
      }
    } else if('button' in ev) {
      var b = ev.button
      if(b === 1) {
        return 4
      } else if(b === 2) {
        return 2
      } else if(b >= 0) {
        return 1<<b
      }
    }
  }
  return 0
}
exports.buttons = mouseButtons

function mouseElement(ev) {
  return ev.target || ev.srcElement || window
}
exports.element = mouseElement

function mouseRelativeX(ev) {
  if(typeof ev === 'object') {
    if('offsetX' in ev) {
      return ev.offsetX
    }
    var target = mouseElement(ev)
    var bounds = target.getBoundingClientRect()
    return ev.clientX - bounds.left
  }
  return 0
}
exports.x = mouseRelativeX

function mouseRelativeY(ev) {
  if(typeof ev === 'object') {
    if('offsetY' in ev) {
      return ev.offsetY
    }
    var target = mouseElement(ev)
    var bounds = target.getBoundingClientRect()
    return ev.clientY - bounds.top
  }
  return 0
}
exports.y = mouseRelativeY

},{}],10:[function(require,module,exports){
'use strict'

var toPX = require('to-px')

module.exports = mouseWheelListen

function mouseWheelListen(element, callback, noScroll) {
  if(typeof element === 'function') {
    noScroll = !!callback
    callback = element
    element = window
  }
  var lineHeight = toPX('ex', element)
  var listener = function(ev) {
    if(noScroll) {
      ev.preventDefault()
    }
    var dx = ev.deltaX || 0
    var dy = ev.deltaY || 0
    var dz = ev.deltaZ || 0
    var mode = ev.deltaMode
    var scale = 1
    switch(mode) {
      case 1:
        scale = lineHeight
      break
      case 2:
        scale = window.innerHeight
      break
    }
    dx *= scale
    dy *= scale
    dz *= scale
    if(dx || dy || dz) {
      return callback(dx, dy, dz, ev)
    }
  }
  element.addEventListener('wheel', listener)
  return listener
}

},{"to-px":14}],11:[function(require,module,exports){
module.exports = function parseUnit(str, out) {
    if (!out)
        out = [ 0, '' ]

    str = String(str)
    var num = parseFloat(str, 10)
    out[0] = num
    out[1] = str.match(/[\d.\-\+]*\s*(.*)/)[1] || ''
    return out
}
},{}],12:[function(require,module,exports){
var mouseChange = require('mouse-change')
var mouseWheel = require('mouse-wheel')
var identity = require('gl-mat4/identity')
var perspective = require('gl-mat4/perspective')
var lookAt = require('gl-mat4/lookAt')

module.exports = createCamera

var isBrowser = typeof window !== 'undefined'

function createCamera (regl, props_) {
  var props = props_ || {}
  var cameraState = {
    view: identity(new Float32Array(16)),
    projection: identity(new Float32Array(16)),
    center: new Float32Array(props.center || 3),
    theta: props.theta || 0,
    phi: props.phi || 0,
    distance: Math.log(props.distance || 10.0),
    eye: new Float32Array(3),
    up: new Float32Array(props.up || [0, 1, 0]),
    fovy: props.fovy || Math.PI / 4.0,
    near: typeof props.near !== 'undefined' ? props.near : 0.01,
    far: typeof props.far !== 'undefined' ? props.far : 1000.0,
    flipY: !!props.flipY,
    dtheta: 0,
    dphi: 0
  }

  var right = new Float32Array([1, 0, 0])
  var front = new Float32Array([0, 0, 1])

  var minDistance = Math.log('minDistance' in props ? props.minDistance : 0.1)
  var maxDistance = Math.log('maxDistance' in props ? props.maxDistance : 1000)

  var ddistance = 0

  var prevX = 0
  var prevY = 0

  if (isBrowser && props.mouse !== false) {
    mouseChange(function (buttons, x, y) {
      if (buttons & 1) {
        var dx = (x - prevX) / window.innerWidth
        var dy = (y - prevY) / window.innerHeight
        var w = Math.max(cameraState.distance, 0.5)

        cameraState.dtheta += w * dx
        cameraState.dphi += w * dy
      }
      prevX = x
      prevY = y
    })
    mouseWheel(function (dx, dy) {
      ddistance += dy / window.innerHeight
    })
  }

  function damp (x) {
    var xd = x * 0.9
    if (Math.abs(xd) < 0.1) {
      return 0
    }
    return xd
  }

  function clamp (x, lo, hi) {
    return Math.min(Math.max(x, lo), hi)
  }

  function updateCamera (props) {
    Object.keys(props).forEach(function (prop) {
      cameraState[prop] = props[prop]
    })

    var center = cameraState.center
    var eye = cameraState.eye
    var up = cameraState.up
    var dtheta = cameraState.dtheta
    var dphi = cameraState.dphi

    cameraState.theta += dtheta
    cameraState.phi = clamp(
      cameraState.phi + dphi,
      -Math.PI / 2.0,
      Math.PI / 2.0)
    cameraState.distance = clamp(
      cameraState.distance + ddistance,
      minDistance,
      maxDistance)

    cameraState.dtheta = damp(dtheta)
    cameraState.dphi = damp(dphi)
    ddistance = damp(ddistance)

    var theta = cameraState.theta
    var phi = cameraState.phi
    var r = Math.exp(cameraState.distance)

    var vf = r * Math.sin(theta) * Math.cos(phi)
    var vr = r * Math.cos(theta) * Math.cos(phi)
    var vu = r * Math.sin(phi)

    for (var i = 0; i < 3; ++i) {
      eye[i] = center[i] + vf * front[i] + vr * right[i] + vu * up[i]
    }

    lookAt(cameraState.view, eye, center, up)
  }

  var injectContext = regl({
    context: Object.assign({}, cameraState, {
      projection: function ({viewportWidth, viewportHeight}) {
        perspective(cameraState.projection,
          cameraState.fovy,
          viewportWidth / viewportHeight,
          cameraState.near,
          cameraState.far)
        if (cameraState.flipY) { cameraState.projection[5] *= -1 }
        return cameraState.projection
      }
    }),
    uniforms: Object.keys(cameraState).reduce(function (uniforms, name) {
      uniforms[name] = regl.context(name)
      return uniforms
    }, {})
  })

  function setupCamera (props, block) {
    if (!block) {
      block = props
      props = {}
    }
    updateCamera(props)
    injectContext(block)
  }

  Object.keys(cameraState).forEach(function (name) {
    setupCamera[name] = cameraState[name]
  })

  return setupCamera
}

},{"gl-mat4/identity":4,"gl-mat4/lookAt":5,"gl-mat4/perspective":6,"mouse-change":8,"mouse-wheel":10}],13:[function(require,module,exports){
(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
	typeof define === 'function' && define.amd ? define(factory) :
	(global.createREGL = factory());
}(this, (function () { 'use strict';

var arrayTypes =  {
	"[object Int8Array]": 5120,
	"[object Int16Array]": 5122,
	"[object Int32Array]": 5124,
	"[object Uint8Array]": 5121,
	"[object Uint8ClampedArray]": 5121,
	"[object Uint16Array]": 5123,
	"[object Uint32Array]": 5125,
	"[object Float32Array]": 5126,
	"[object Float64Array]": 5121,
	"[object ArrayBuffer]": 5121
};

var isTypedArray = function (x) {
  return Object.prototype.toString.call(x) in arrayTypes
};

var extend = function (base, opts) {
  var keys = Object.keys(opts);
  for (var i = 0; i < keys.length; ++i) {
    base[keys[i]] = opts[keys[i]];
  }
  return base
};

// Error checking and parameter validation.
//
// Statements for the form `check.someProcedure(...)` get removed by
// a browserify transform for optimized/minified bundles.
//
/* globals btoa */
// only used for extracting shader names.  if btoa not present, then errors
// will be slightly crappier
function decodeB64 (str) {
  if (typeof btoa !== 'undefined') {
    return btoa(str)
  }
  return 'base64:' + str
}

function raise (message) {
  var error = new Error('(regl) ' + message);
  console.error(error);
  throw error
}

function check (pred, message) {
  if (!pred) {
    raise(message);
  }
}

function encolon (message) {
  if (message) {
    return ': ' + message
  }
  return ''
}

function checkParameter (param, possibilities, message) {
  if (!(param in possibilities)) {
    raise('unknown parameter (' + param + ')' + encolon(message) +
          '. possible values: ' + Object.keys(possibilities).join());
  }
}

function checkIsTypedArray (data, message) {
  if (!isTypedArray(data)) {
    raise(
      'invalid parameter type' + encolon(message) +
      '. must be a typed array');
  }
}

function checkTypeOf (value, type, message) {
  if (typeof value !== type) {
    raise(
      'invalid parameter type' + encolon(message) +
      '. expected ' + type + ', got ' + (typeof value));
  }
}

function checkNonNegativeInt (value, message) {
  if (!((value >= 0) &&
        ((value | 0) === value))) {
    raise('invalid parameter type, (' + value + ')' + encolon(message) +
          '. must be a nonnegative integer');
  }
}

function checkOneOf (value, list, message) {
  if (list.indexOf(value) < 0) {
    raise('invalid value' + encolon(message) + '. must be one of: ' + list);
  }
}

var constructorKeys = [
  'gl',
  'canvas',
  'container',
  'attributes',
  'pixelRatio',
  'extensions',
  'optionalExtensions',
  'profile',
  'onDone'
];

function checkConstructor (obj) {
  Object.keys(obj).forEach(function (key) {
    if (constructorKeys.indexOf(key) < 0) {
      raise('invalid regl constructor argument "' + key + '". must be one of ' + constructorKeys);
    }
  });
}

function leftPad (str, n) {
  str = str + '';
  while (str.length < n) {
    str = ' ' + str;
  }
  return str
}

function ShaderFile () {
  this.name = 'unknown';
  this.lines = [];
  this.index = {};
  this.hasErrors = false;
}

function ShaderLine (number, line) {
  this.number = number;
  this.line = line;
  this.errors = [];
}

function ShaderError (fileNumber, lineNumber, message) {
  this.file = fileNumber;
  this.line = lineNumber;
  this.message = message;
}

function guessCommand () {
  var error = new Error();
  var stack = (error.stack || error).toString();
  var pat = /compileProcedure.*\n\s*at.*\((.*)\)/.exec(stack);
  if (pat) {
    return pat[1]
  }
  var pat2 = /compileProcedure.*\n\s*at\s+(.*)(\n|$)/.exec(stack);
  if (pat2) {
    return pat2[1]
  }
  return 'unknown'
}

function guessCallSite () {
  var error = new Error();
  var stack = (error.stack || error).toString();
  var pat = /at REGLCommand.*\n\s+at.*\((.*)\)/.exec(stack);
  if (pat) {
    return pat[1]
  }
  var pat2 = /at REGLCommand.*\n\s+at\s+(.*)\n/.exec(stack);
  if (pat2) {
    return pat2[1]
  }
  return 'unknown'
}

function parseSource (source, command) {
  var lines = source.split('\n');
  var lineNumber = 1;
  var fileNumber = 0;
  var files = {
    unknown: new ShaderFile(),
    0: new ShaderFile()
  };
  files.unknown.name = files[0].name = command || guessCommand();
  files.unknown.lines.push(new ShaderLine(0, ''));
  for (var i = 0; i < lines.length; ++i) {
    var line = lines[i];
    var parts = /^\s*\#\s*(\w+)\s+(.+)\s*$/.exec(line);
    if (parts) {
      switch (parts[1]) {
        case 'line':
          var lineNumberInfo = /(\d+)(\s+\d+)?/.exec(parts[2]);
          if (lineNumberInfo) {
            lineNumber = lineNumberInfo[1] | 0;
            if (lineNumberInfo[2]) {
              fileNumber = lineNumberInfo[2] | 0;
              if (!(fileNumber in files)) {
                files[fileNumber] = new ShaderFile();
              }
            }
          }
          break
        case 'define':
          var nameInfo = /SHADER_NAME(_B64)?\s+(.*)$/.exec(parts[2]);
          if (nameInfo) {
            files[fileNumber].name = (nameInfo[1]
                ? decodeB64(nameInfo[2])
                : nameInfo[2]);
          }
          break
      }
    }
    files[fileNumber].lines.push(new ShaderLine(lineNumber++, line));
  }
  Object.keys(files).forEach(function (fileNumber) {
    var file = files[fileNumber];
    file.lines.forEach(function (line) {
      file.index[line.number] = line;
    });
  });
  return files
}

function parseErrorLog (errLog) {
  var result = [];
  errLog.split('\n').forEach(function (errMsg) {
    if (errMsg.length < 5) {
      return
    }
    var parts = /^ERROR\:\s+(\d+)\:(\d+)\:\s*(.*)$/.exec(errMsg);
    if (parts) {
      result.push(new ShaderError(
        parts[1] | 0,
        parts[2] | 0,
        parts[3].trim()));
    } else if (errMsg.length > 0) {
      result.push(new ShaderError('unknown', 0, errMsg));
    }
  });
  return result
}

function annotateFiles (files, errors) {
  errors.forEach(function (error) {
    var file = files[error.file];
    if (file) {
      var line = file.index[error.line];
      if (line) {
        line.errors.push(error);
        file.hasErrors = true;
        return
      }
    }
    files.unknown.hasErrors = true;
    files.unknown.lines[0].errors.push(error);
  });
}

function checkShaderError (gl, shader, source, type, command) {
  if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
    var errLog = gl.getShaderInfoLog(shader);
    var typeName = type === gl.FRAGMENT_SHADER ? 'fragment' : 'vertex';
    checkCommandType(source, 'string', typeName + ' shader source must be a string', command);
    var files = parseSource(source, command);
    var errors = parseErrorLog(errLog);
    annotateFiles(files, errors);

    Object.keys(files).forEach(function (fileNumber) {
      var file = files[fileNumber];
      if (!file.hasErrors) {
        return
      }

      var strings = [''];
      var styles = [''];

      function push (str, style) {
        strings.push(str);
        styles.push(style || '');
      }

      push('file number ' + fileNumber + ': ' + file.name + '\n', 'color:red;text-decoration:underline;font-weight:bold');

      file.lines.forEach(function (line) {
        if (line.errors.length > 0) {
          push(leftPad(line.number, 4) + '|  ', 'background-color:yellow; font-weight:bold');
          push(line.line + '\n', 'color:red; background-color:yellow; font-weight:bold');

          // try to guess token
          var offset = 0;
          line.errors.forEach(function (error) {
            var message = error.message;
            var token = /^\s*\'(.*)\'\s*\:\s*(.*)$/.exec(message);
            if (token) {
              var tokenPat = token[1];
              message = token[2];
              switch (tokenPat) {
                case 'assign':
                  tokenPat = '=';
                  break
              }
              offset = Math.max(line.line.indexOf(tokenPat, offset), 0);
            } else {
              offset = 0;
            }

            push(leftPad('| ', 6));
            push(leftPad('^^^', offset + 3) + '\n', 'font-weight:bold');
            push(leftPad('| ', 6));
            push(message + '\n', 'font-weight:bold');
          });
          push(leftPad('| ', 6) + '\n');
        } else {
          push(leftPad(line.number, 4) + '|  ');
          push(line.line + '\n', 'color:red');
        }
      });
      if (typeof document !== 'undefined') {
        styles[0] = strings.join('%c');
        console.log.apply(console, styles);
      } else {
        console.log(strings.join(''));
      }
    });

    check.raise('Error compiling ' + typeName + ' shader, ' + files[0].name);
  }
}

function checkLinkError (gl, program, fragShader, vertShader, command) {
  if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
    var errLog = gl.getProgramInfoLog(program);
    var fragParse = parseSource(fragShader, command);
    var vertParse = parseSource(vertShader, command);

    var header = 'Error linking program with vertex shader, "' +
      vertParse[0].name + '", and fragment shader "' + fragParse[0].name + '"';

    if (typeof document !== 'undefined') {
      console.log('%c' + header + '\n%c' + errLog,
        'color:red;text-decoration:underline;font-weight:bold',
        'color:red');
    } else {
      console.log(header + '\n' + errLog);
    }
    check.raise(header);
  }
}

function saveCommandRef (object) {
  object._commandRef = guessCommand();
}

function saveDrawCommandInfo (opts, uniforms, attributes, stringStore) {
  saveCommandRef(opts);

  function id (str) {
    if (str) {
      return stringStore.id(str)
    }
    return 0
  }
  opts._fragId = id(opts.static.frag);
  opts._vertId = id(opts.static.vert);

  function addProps (dict, set) {
    Object.keys(set).forEach(function (u) {
      dict[stringStore.id(u)] = true;
    });
  }

  var uniformSet = opts._uniformSet = {};
  addProps(uniformSet, uniforms.static);
  addProps(uniformSet, uniforms.dynamic);

  var attributeSet = opts._attributeSet = {};
  addProps(attributeSet, attributes.static);
  addProps(attributeSet, attributes.dynamic);

  opts._hasCount = (
    'count' in opts.static ||
    'count' in opts.dynamic ||
    'elements' in opts.static ||
    'elements' in opts.dynamic);
}

function commandRaise (message, command) {
  var callSite = guessCallSite();
  raise(message +
    ' in command ' + (command || guessCommand()) +
    (callSite === 'unknown' ? '' : ' called from ' + callSite));
}

function checkCommand (pred, message, command) {
  if (!pred) {
    commandRaise(message, command || guessCommand());
  }
}

function checkParameterCommand (param, possibilities, message, command) {
  if (!(param in possibilities)) {
    commandRaise(
      'unknown parameter (' + param + ')' + encolon(message) +
      '. possible values: ' + Object.keys(possibilities).join(),
      command || guessCommand());
  }
}

function checkCommandType (value, type, message, command) {
  if (typeof value !== type) {
    commandRaise(
      'invalid parameter type' + encolon(message) +
      '. expected ' + type + ', got ' + (typeof value),
      command || guessCommand());
  }
}

function checkOptional (block) {
  block();
}

function checkFramebufferFormat (attachment, texFormats, rbFormats) {
  if (attachment.texture) {
    checkOneOf(
      attachment.texture._texture.internalformat,
      texFormats,
      'unsupported texture format for attachment');
  } else {
    checkOneOf(
      attachment.renderbuffer._renderbuffer.format,
      rbFormats,
      'unsupported renderbuffer format for attachment');
  }
}

var GL_CLAMP_TO_EDGE = 0x812F;

var GL_NEAREST = 0x2600;
var GL_NEAREST_MIPMAP_NEAREST = 0x2700;
var GL_LINEAR_MIPMAP_NEAREST = 0x2701;
var GL_NEAREST_MIPMAP_LINEAR = 0x2702;
var GL_LINEAR_MIPMAP_LINEAR = 0x2703;

var GL_BYTE = 5120;
var GL_UNSIGNED_BYTE = 5121;
var GL_SHORT = 5122;
var GL_UNSIGNED_SHORT = 5123;
var GL_INT = 5124;
var GL_UNSIGNED_INT = 5125;
var GL_FLOAT = 5126;

var GL_UNSIGNED_SHORT_4_4_4_4 = 0x8033;
var GL_UNSIGNED_SHORT_5_5_5_1 = 0x8034;
var GL_UNSIGNED_SHORT_5_6_5 = 0x8363;
var GL_UNSIGNED_INT_24_8_WEBGL = 0x84FA;

var GL_HALF_FLOAT_OES = 0x8D61;

var TYPE_SIZE = {};

TYPE_SIZE[GL_BYTE] =
TYPE_SIZE[GL_UNSIGNED_BYTE] = 1;

TYPE_SIZE[GL_SHORT] =
TYPE_SIZE[GL_UNSIGNED_SHORT] =
TYPE_SIZE[GL_HALF_FLOAT_OES] =
TYPE_SIZE[GL_UNSIGNED_SHORT_5_6_5] =
TYPE_SIZE[GL_UNSIGNED_SHORT_4_4_4_4] =
TYPE_SIZE[GL_UNSIGNED_SHORT_5_5_5_1] = 2;

TYPE_SIZE[GL_INT] =
TYPE_SIZE[GL_UNSIGNED_INT] =
TYPE_SIZE[GL_FLOAT] =
TYPE_SIZE[GL_UNSIGNED_INT_24_8_WEBGL] = 4;

function pixelSize (type, channels) {
  if (type === GL_UNSIGNED_SHORT_5_5_5_1 ||
      type === GL_UNSIGNED_SHORT_4_4_4_4 ||
      type === GL_UNSIGNED_SHORT_5_6_5) {
    return 2
  } else if (type === GL_UNSIGNED_INT_24_8_WEBGL) {
    return 4
  } else {
    return TYPE_SIZE[type] * channels
  }
}

function isPow2 (v) {
  return !(v & (v - 1)) && (!!v)
}

function checkTexture2D (info, mipData, limits) {
  var i;
  var w = mipData.width;
  var h = mipData.height;
  var c = mipData.channels;

  // Check texture shape
  check(w > 0 && w <= limits.maxTextureSize &&
        h > 0 && h <= limits.maxTextureSize,
        'invalid texture shape');

  // check wrap mode
  if (info.wrapS !== GL_CLAMP_TO_EDGE || info.wrapT !== GL_CLAMP_TO_EDGE) {
    check(isPow2(w) && isPow2(h),
      'incompatible wrap mode for texture, both width and height must be power of 2');
  }

  if (mipData.mipmask === 1) {
    if (w !== 1 && h !== 1) {
      check(
        info.minFilter !== GL_NEAREST_MIPMAP_NEAREST &&
        info.minFilter !== GL_NEAREST_MIPMAP_LINEAR &&
        info.minFilter !== GL_LINEAR_MIPMAP_NEAREST &&
        info.minFilter !== GL_LINEAR_MIPMAP_LINEAR,
        'min filter requires mipmap');
    }
  } else {
    // texture must be power of 2
    check(isPow2(w) && isPow2(h),
      'texture must be a square power of 2 to support mipmapping');
    check(mipData.mipmask === (w << 1) - 1,
      'missing or incomplete mipmap data');
  }

  if (mipData.type === GL_FLOAT) {
    if (limits.extensions.indexOf('oes_texture_float_linear') < 0) {
      check(info.minFilter === GL_NEAREST && info.magFilter === GL_NEAREST,
        'filter not supported, must enable oes_texture_float_linear');
    }
    check(!info.genMipmaps,
      'mipmap generation not supported with float textures');
  }

  // check image complete
  var mipimages = mipData.images;
  for (i = 0; i < 16; ++i) {
    if (mipimages[i]) {
      var mw = w >> i;
      var mh = h >> i;
      check(mipData.mipmask & (1 << i), 'missing mipmap data');

      var img = mipimages[i];

      check(
        img.width === mw &&
        img.height === mh,
        'invalid shape for mip images');

      check(
        img.format === mipData.format &&
        img.internalformat === mipData.internalformat &&
        img.type === mipData.type,
        'incompatible type for mip image');

      if (img.compressed) {
        // TODO: check size for compressed images
      } else if (img.data) {
        // check(img.data.byteLength === mw * mh *
        // Math.max(pixelSize(img.type, c), img.unpackAlignment),
        var rowSize = Math.ceil(pixelSize(img.type, c) * mw / img.unpackAlignment) * img.unpackAlignment;
        check(img.data.byteLength === rowSize * mh,
          'invalid data for image, buffer size is inconsistent with image format');
      } else if (img.element) {
        // TODO: check element can be loaded
      } else if (img.copy) {
        // TODO: check compatible format and type
      }
    } else if (!info.genMipmaps) {
      check((mipData.mipmask & (1 << i)) === 0, 'extra mipmap data');
    }
  }

  if (mipData.compressed) {
    check(!info.genMipmaps,
      'mipmap generation for compressed images not supported');
  }
}

function checkTextureCube (texture, info, faces, limits) {
  var w = texture.width;
  var h = texture.height;
  var c = texture.channels;

  // Check texture shape
  check(
    w > 0 && w <= limits.maxTextureSize && h > 0 && h <= limits.maxTextureSize,
    'invalid texture shape');
  check(
    w === h,
    'cube map must be square');
  check(
    info.wrapS === GL_CLAMP_TO_EDGE && info.wrapT === GL_CLAMP_TO_EDGE,
    'wrap mode not supported by cube map');

  for (var i = 0; i < faces.length; ++i) {
    var face = faces[i];
    check(
      face.width === w && face.height === h,
      'inconsistent cube map face shape');

    if (info.genMipmaps) {
      check(!face.compressed,
        'can not generate mipmap for compressed textures');
      check(face.mipmask === 1,
        'can not specify mipmaps and generate mipmaps');
    } else {
      // TODO: check mip and filter mode
    }

    var mipmaps = face.images;
    for (var j = 0; j < 16; ++j) {
      var img = mipmaps[j];
      if (img) {
        var mw = w >> j;
        var mh = h >> j;
        check(face.mipmask & (1 << j), 'missing mipmap data');
        check(
          img.width === mw &&
          img.height === mh,
          'invalid shape for mip images');
        check(
          img.format === texture.format &&
          img.internalformat === texture.internalformat &&
          img.type === texture.type,
          'incompatible type for mip image');

        if (img.compressed) {
          // TODO: check size for compressed images
        } else if (img.data) {
          check(img.data.byteLength === mw * mh *
            Math.max(pixelSize(img.type, c), img.unpackAlignment),
            'invalid data for image, buffer size is inconsistent with image format');
        } else if (img.element) {
          // TODO: check element can be loaded
        } else if (img.copy) {
          // TODO: check compatible format and type
        }
      }
    }
  }
}

var check$1 = extend(check, {
  optional: checkOptional,
  raise: raise,
  commandRaise: commandRaise,
  command: checkCommand,
  parameter: checkParameter,
  commandParameter: checkParameterCommand,
  constructor: checkConstructor,
  type: checkTypeOf,
  commandType: checkCommandType,
  isTypedArray: checkIsTypedArray,
  nni: checkNonNegativeInt,
  oneOf: checkOneOf,
  shaderError: checkShaderError,
  linkError: checkLinkError,
  callSite: guessCallSite,
  saveCommandRef: saveCommandRef,
  saveDrawInfo: saveDrawCommandInfo,
  framebufferFormat: checkFramebufferFormat,
  guessCommand: guessCommand,
  texture2D: checkTexture2D,
  textureCube: checkTextureCube
});

var VARIABLE_COUNTER = 0;

var DYN_FUNC = 0;

function DynamicVariable (type, data) {
  this.id = (VARIABLE_COUNTER++);
  this.type = type;
  this.data = data;
}

function escapeStr (str) {
  return str.replace(/\\/g, '\\\\').replace(/"/g, '\\"')
}

function splitParts (str) {
  if (str.length === 0) {
    return []
  }

  var firstChar = str.charAt(0);
  var lastChar = str.charAt(str.length - 1);

  if (str.length > 1 &&
      firstChar === lastChar &&
      (firstChar === '"' || firstChar === "'")) {
    return ['"' + escapeStr(str.substr(1, str.length - 2)) + '"']
  }

  var parts = /\[(false|true|null|\d+|'[^']*'|"[^"]*")\]/.exec(str);
  if (parts) {
    return (
      splitParts(str.substr(0, parts.index))
      .concat(splitParts(parts[1]))
      .concat(splitParts(str.substr(parts.index + parts[0].length)))
    )
  }

  var subparts = str.split('.');
  if (subparts.length === 1) {
    return ['"' + escapeStr(str) + '"']
  }

  var result = [];
  for (var i = 0; i < subparts.length; ++i) {
    result = result.concat(splitParts(subparts[i]));
  }
  return result
}

function toAccessorString (str) {
  return '[' + splitParts(str).join('][') + ']'
}

function defineDynamic (type, data) {
  return new DynamicVariable(type, toAccessorString(data + ''))
}

function isDynamic (x) {
  return (typeof x === 'function' && !x._reglType) ||
         x instanceof DynamicVariable
}

function unbox (x, path) {
  if (typeof x === 'function') {
    return new DynamicVariable(DYN_FUNC, x)
  }
  return x
}

var dynamic = {
  DynamicVariable: DynamicVariable,
  define: defineDynamic,
  isDynamic: isDynamic,
  unbox: unbox,
  accessor: toAccessorString
};

/* globals requestAnimationFrame, cancelAnimationFrame */
var raf = {
  next: typeof requestAnimationFrame === 'function'
    ? function (cb) { return requestAnimationFrame(cb) }
    : function (cb) { return setTimeout(cb, 16) },
  cancel: typeof cancelAnimationFrame === 'function'
    ? function (raf) { return cancelAnimationFrame(raf) }
    : clearTimeout
};

/* globals performance */
var clock = (typeof performance !== 'undefined' && performance.now)
  ? function () { return performance.now() }
  : function () { return +(new Date()) };

function createStringStore () {
  var stringIds = {'': 0};
  var stringValues = [''];
  return {
    id: function (str) {
      var result = stringIds[str];
      if (result) {
        return result
      }
      result = stringIds[str] = stringValues.length;
      stringValues.push(str);
      return result
    },

    str: function (id) {
      return stringValues[id]
    }
  }
}

// Context and canvas creation helper functions
function createCanvas (element, onDone, pixelRatio) {
  var canvas = document.createElement('canvas');
  extend(canvas.style, {
    border: 0,
    margin: 0,
    padding: 0,
    top: 0,
    left: 0
  });
  element.appendChild(canvas);

  if (element === document.body) {
    canvas.style.position = 'absolute';
    extend(element.style, {
      margin: 0,
      padding: 0
    });
  }

  function resize () {
    var w = window.innerWidth;
    var h = window.innerHeight;
    if (element !== document.body) {
      var bounds = element.getBoundingClientRect();
      w = bounds.right - bounds.left;
      h = bounds.bottom - bounds.top;
    }
    canvas.width = pixelRatio * w;
    canvas.height = pixelRatio * h;
    extend(canvas.style, {
      width: w + 'px',
      height: h + 'px'
    });
  }

  window.addEventListener('resize', resize, false);

  function onDestroy () {
    window.removeEventListener('resize', resize);
    element.removeChild(canvas);
  }

  resize();

  return {
    canvas: canvas,
    onDestroy: onDestroy
  }
}

function createContext (canvas, contexAttributes) {
  function get (name) {
    try {
      return canvas.getContext(name, contexAttributes)
    } catch (e) {
      return null
    }
  }
  return (
    get('webgl') ||
    get('experimental-webgl') ||
    get('webgl-experimental')
  )
}

function isHTMLElement (obj) {
  return (
    typeof obj.nodeName === 'string' &&
    typeof obj.appendChild === 'function' &&
    typeof obj.getBoundingClientRect === 'function'
  )
}

function isWebGLContext (obj) {
  return (
    typeof obj.drawArrays === 'function' ||
    typeof obj.drawElements === 'function'
  )
}

function parseExtensions (input) {
  if (typeof input === 'string') {
    return input.split()
  }
  check$1(Array.isArray(input), 'invalid extension array');
  return input
}

function getElement (desc) {
  if (typeof desc === 'string') {
    check$1(typeof document !== 'undefined', 'not supported outside of DOM');
    return document.querySelector(desc)
  }
  return desc
}

function parseArgs (args_) {
  var args = args_ || {};
  var element, container, canvas, gl;
  var contextAttributes = {};
  var extensions = [];
  var optionalExtensions = [];
  var pixelRatio = (typeof window === 'undefined' ? 1 : window.devicePixelRatio);
  var profile = false;
  var onDone = function (err) {
    if (err) {
      check$1.raise(err);
    }
  };
  var onDestroy = function () {};
  if (typeof args === 'string') {
    check$1(
      typeof document !== 'undefined',
      'selector queries only supported in DOM enviroments');
    element = document.querySelector(args);
    check$1(element, 'invalid query string for element');
  } else if (typeof args === 'object') {
    if (isHTMLElement(args)) {
      element = args;
    } else if (isWebGLContext(args)) {
      gl = args;
      canvas = gl.canvas;
    } else {
      check$1.constructor(args);
      if ('gl' in args) {
        gl = args.gl;
      } else if ('canvas' in args) {
        canvas = getElement(args.canvas);
      } else if ('container' in args) {
        container = getElement(args.container);
      }
      if ('attributes' in args) {
        contextAttributes = args.attributes;
        check$1.type(contextAttributes, 'object', 'invalid context attributes');
      }
      if ('extensions' in args) {
        extensions = parseExtensions(args.extensions);
      }
      if ('optionalExtensions' in args) {
        optionalExtensions = parseExtensions(args.optionalExtensions);
      }
      if ('onDone' in args) {
        check$1.type(
          args.onDone, 'function',
          'invalid or missing onDone callback');
        onDone = args.onDone;
      }
      if ('profile' in args) {
        profile = !!args.profile;
      }
      if ('pixelRatio' in args) {
        pixelRatio = +args.pixelRatio;
        check$1(pixelRatio > 0, 'invalid pixel ratio');
      }
    }
  } else {
    check$1.raise('invalid arguments to regl');
  }

  if (element) {
    if (element.nodeName.toLowerCase() === 'canvas') {
      canvas = element;
    } else {
      container = element;
    }
  }

  if (!gl) {
    if (!canvas) {
      check$1(
        typeof document !== 'undefined',
        'must manually specify webgl context outside of DOM environments');
      var result = createCanvas(container || document.body, onDone, pixelRatio);
      if (!result) {
        return null
      }
      canvas = result.canvas;
      onDestroy = result.onDestroy;
    }
    gl = createContext(canvas, contextAttributes);
  }

  if (!gl) {
    onDestroy();
    onDone('webgl not supported, try upgrading your browser or graphics drivers http://get.webgl.org');
    return null
  }

  return {
    gl: gl,
    canvas: canvas,
    container: container,
    extensions: extensions,
    optionalExtensions: optionalExtensions,
    pixelRatio: pixelRatio,
    profile: profile,
    onDone: onDone,
    onDestroy: onDestroy
  }
}

function createExtensionCache (gl, config) {
  var extensions = {};

  function tryLoadExtension (name_) {
    check$1.type(name_, 'string', 'extension name must be string');
    var name = name_.toLowerCase();
    var ext;
    try {
      ext = extensions[name] = gl.getExtension(name);
    } catch (e) {}
    return !!ext
  }

  for (var i = 0; i < config.extensions.length; ++i) {
    var name = config.extensions[i];
    if (!tryLoadExtension(name)) {
      config.onDestroy();
      config.onDone('"' + name + '" extension is not supported by the current WebGL context, try upgrading your system or a different browser');
      return null
    }
  }

  config.optionalExtensions.forEach(tryLoadExtension);

  return {
    extensions: extensions,
    restore: function () {
      Object.keys(extensions).forEach(function (name) {
        if (!tryLoadExtension(name)) {
          throw new Error('(regl): error restoring extension ' + name)
        }
      });
    }
  }
}

var GL_SUBPIXEL_BITS = 0x0D50;
var GL_RED_BITS = 0x0D52;
var GL_GREEN_BITS = 0x0D53;
var GL_BLUE_BITS = 0x0D54;
var GL_ALPHA_BITS = 0x0D55;
var GL_DEPTH_BITS = 0x0D56;
var GL_STENCIL_BITS = 0x0D57;

var GL_ALIASED_POINT_SIZE_RANGE = 0x846D;
var GL_ALIASED_LINE_WIDTH_RANGE = 0x846E;

var GL_MAX_TEXTURE_SIZE = 0x0D33;
var GL_MAX_VIEWPORT_DIMS = 0x0D3A;
var GL_MAX_VERTEX_ATTRIBS = 0x8869;
var GL_MAX_VERTEX_UNIFORM_VECTORS = 0x8DFB;
var GL_MAX_VARYING_VECTORS = 0x8DFC;
var GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS = 0x8B4D;
var GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS = 0x8B4C;
var GL_MAX_TEXTURE_IMAGE_UNITS = 0x8872;
var GL_MAX_FRAGMENT_UNIFORM_VECTORS = 0x8DFD;
var GL_MAX_CUBE_MAP_TEXTURE_SIZE = 0x851C;
var GL_MAX_RENDERBUFFER_SIZE = 0x84E8;

var GL_VENDOR = 0x1F00;
var GL_RENDERER = 0x1F01;
var GL_VERSION = 0x1F02;
var GL_SHADING_LANGUAGE_VERSION = 0x8B8C;

var GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT = 0x84FF;

var GL_MAX_COLOR_ATTACHMENTS_WEBGL = 0x8CDF;
var GL_MAX_DRAW_BUFFERS_WEBGL = 0x8824;

var wrapLimits = function (gl, extensions) {
  var maxAnisotropic = 1;
  if (extensions.ext_texture_filter_anisotropic) {
    maxAnisotropic = gl.getParameter(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT);
  }

  var maxDrawbuffers = 1;
  var maxColorAttachments = 1;
  if (extensions.webgl_draw_buffers) {
    maxDrawbuffers = gl.getParameter(GL_MAX_DRAW_BUFFERS_WEBGL);
    maxColorAttachments = gl.getParameter(GL_MAX_COLOR_ATTACHMENTS_WEBGL);
  }

  return {
    // drawing buffer bit depth
    colorBits: [
      gl.getParameter(GL_RED_BITS),
      gl.getParameter(GL_GREEN_BITS),
      gl.getParameter(GL_BLUE_BITS),
      gl.getParameter(GL_ALPHA_BITS)
    ],
    depthBits: gl.getParameter(GL_DEPTH_BITS),
    stencilBits: gl.getParameter(GL_STENCIL_BITS),
    subpixelBits: gl.getParameter(GL_SUBPIXEL_BITS),

    // supported extensions
    extensions: Object.keys(extensions).filter(function (ext) {
      return !!extensions[ext]
    }),

    // max aniso samples
    maxAnisotropic: maxAnisotropic,

    // max draw buffers
    maxDrawbuffers: maxDrawbuffers,
    maxColorAttachments: maxColorAttachments,

    // point and line size ranges
    pointSizeDims: gl.getParameter(GL_ALIASED_POINT_SIZE_RANGE),
    lineWidthDims: gl.getParameter(GL_ALIASED_LINE_WIDTH_RANGE),
    maxViewportDims: gl.getParameter(GL_MAX_VIEWPORT_DIMS),
    maxCombinedTextureUnits: gl.getParameter(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS),
    maxCubeMapSize: gl.getParameter(GL_MAX_CUBE_MAP_TEXTURE_SIZE),
    maxRenderbufferSize: gl.getParameter(GL_MAX_RENDERBUFFER_SIZE),
    maxTextureUnits: gl.getParameter(GL_MAX_TEXTURE_IMAGE_UNITS),
    maxTextureSize: gl.getParameter(GL_MAX_TEXTURE_SIZE),
    maxAttributes: gl.getParameter(GL_MAX_VERTEX_ATTRIBS),
    maxVertexUniforms: gl.getParameter(GL_MAX_VERTEX_UNIFORM_VECTORS),
    maxVertexTextureUnits: gl.getParameter(GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS),
    maxVaryingVectors: gl.getParameter(GL_MAX_VARYING_VECTORS),
    maxFragmentUniforms: gl.getParameter(GL_MAX_FRAGMENT_UNIFORM_VECTORS),

    // vendor info
    glsl: gl.getParameter(GL_SHADING_LANGUAGE_VERSION),
    renderer: gl.getParameter(GL_RENDERER),
    vendor: gl.getParameter(GL_VENDOR),
    version: gl.getParameter(GL_VERSION)
  }
};

function isNDArrayLike (obj) {
  return (
    !!obj &&
    typeof obj === 'object' &&
    Array.isArray(obj.shape) &&
    Array.isArray(obj.stride) &&
    typeof obj.offset === 'number' &&
    obj.shape.length === obj.stride.length &&
    (Array.isArray(obj.data) ||
      isTypedArray(obj.data)))
}

var values = function (obj) {
  return Object.keys(obj).map(function (key) { return obj[key] })
};

function loop (n, f) {
  var result = Array(n);
  for (var i = 0; i < n; ++i) {
    result[i] = f(i);
  }
  return result
}

var GL_BYTE$1 = 5120;
var GL_UNSIGNED_BYTE$2 = 5121;
var GL_SHORT$1 = 5122;
var GL_UNSIGNED_SHORT$1 = 5123;
var GL_INT$1 = 5124;
var GL_UNSIGNED_INT$1 = 5125;
var GL_FLOAT$2 = 5126;

var bufferPool = loop(8, function () {
  return []
});

function nextPow16 (v) {
  for (var i = 16; i <= (1 << 28); i *= 16) {
    if (v <= i) {
      return i
    }
  }
  return 0
}

function log2 (v) {
  var r, shift;
  r = (v > 0xFFFF) << 4;
  v >>>= r;
  shift = (v > 0xFF) << 3;
  v >>>= shift; r |= shift;
  shift = (v > 0xF) << 2;
  v >>>= shift; r |= shift;
  shift = (v > 0x3) << 1;
  v >>>= shift; r |= shift;
  return r | (v >> 1)
}

function alloc (n) {
  var sz = nextPow16(n);
  var bin = bufferPool[log2(sz) >> 2];
  if (bin.length > 0) {
    return bin.pop()
  }
  return new ArrayBuffer(sz)
}

function free (buf) {
  bufferPool[log2(buf.byteLength) >> 2].push(buf);
}

function allocType (type, n) {
  var result = null;
  switch (type) {
    case GL_BYTE$1:
      result = new Int8Array(alloc(n), 0, n);
      break
    case GL_UNSIGNED_BYTE$2:
      result = new Uint8Array(alloc(n), 0, n);
      break
    case GL_SHORT$1:
      result = new Int16Array(alloc(2 * n), 0, n);
      break
    case GL_UNSIGNED_SHORT$1:
      result = new Uint16Array(alloc(2 * n), 0, n);
      break
    case GL_INT$1:
      result = new Int32Array(alloc(4 * n), 0, n);
      break
    case GL_UNSIGNED_INT$1:
      result = new Uint32Array(alloc(4 * n), 0, n);
      break
    case GL_FLOAT$2:
      result = new Float32Array(alloc(4 * n), 0, n);
      break
    default:
      return null
  }
  if (result.length !== n) {
    return result.subarray(0, n)
  }
  return result
}

function freeType (array) {
  free(array.buffer);
}

var pool = {
  alloc: alloc,
  free: free,
  allocType: allocType,
  freeType: freeType
};

var flattenUtils = {
  shape: arrayShape$1,
  flatten: flattenArray
};

function flatten1D (array, nx, out) {
  for (var i = 0; i < nx; ++i) {
    out[i] = array[i];
  }
}

function flatten2D (array, nx, ny, out) {
  var ptr = 0;
  for (var i = 0; i < nx; ++i) {
    var row = array[i];
    for (var j = 0; j < ny; ++j) {
      out[ptr++] = row[j];
    }
  }
}

function flatten3D (array, nx, ny, nz, out, ptr_) {
  var ptr = ptr_;
  for (var i = 0; i < nx; ++i) {
    var row = array[i];
    for (var j = 0; j < ny; ++j) {
      var col = row[j];
      for (var k = 0; k < nz; ++k) {
        out[ptr++] = col[k];
      }
    }
  }
}

function flattenRec (array, shape, level, out, ptr) {
  var stride = 1;
  for (var i = level + 1; i < shape.length; ++i) {
    stride *= shape[i];
  }
  var n = shape[level];
  if (shape.length - level === 4) {
    var nx = shape[level + 1];
    var ny = shape[level + 2];
    var nz = shape[level + 3];
    for (i = 0; i < n; ++i) {
      flatten3D(array[i], nx, ny, nz, out, ptr);
      ptr += stride;
    }
  } else {
    for (i = 0; i < n; ++i) {
      flattenRec(array[i], shape, level + 1, out, ptr);
      ptr += stride;
    }
  }
}

function flattenArray (array, shape, type, out_) {
  var sz = 1;
  if (shape.length) {
    for (var i = 0; i < shape.length; ++i) {
      sz *= shape[i];
    }
  } else {
    sz = 0;
  }
  var out = out_ || pool.allocType(type, sz);
  switch (shape.length) {
    case 0:
      break
    case 1:
      flatten1D(array, shape[0], out);
      break
    case 2:
      flatten2D(array, shape[0], shape[1], out);
      break
    case 3:
      flatten3D(array, shape[0], shape[1], shape[2], out, 0);
      break
    default:
      flattenRec(array, shape, 0, out, 0);
  }
  return out
}

function arrayShape$1 (array_) {
  var shape = [];
  for (var array = array_; array.length; array = array[0]) {
    shape.push(array.length);
  }
  return shape
}

var int8 = 5120;
var int16 = 5122;
var int32 = 5124;
var uint8 = 5121;
var uint16 = 5123;
var uint32 = 5125;
var float = 5126;
var float32 = 5126;
var glTypes = {
	int8: int8,
	int16: int16,
	int32: int32,
	uint8: uint8,
	uint16: uint16,
	uint32: uint32,
	float: float,
	float32: float32
};

var dynamic$1 = 35048;
var stream = 35040;
var usageTypes = {
	dynamic: dynamic$1,
	stream: stream,
	"static": 35044
};

var arrayFlatten = flattenUtils.flatten;
var arrayShape = flattenUtils.shape;

var GL_STATIC_DRAW = 0x88E4;
var GL_STREAM_DRAW = 0x88E0;

var GL_UNSIGNED_BYTE$1 = 5121;
var GL_FLOAT$1 = 5126;

var DTYPES_SIZES = [];
DTYPES_SIZES[5120] = 1; // int8
DTYPES_SIZES[5122] = 2; // int16
DTYPES_SIZES[5124] = 4; // int32
DTYPES_SIZES[5121] = 1; // uint8
DTYPES_SIZES[5123] = 2; // uint16
DTYPES_SIZES[5125] = 4; // uint32
DTYPES_SIZES[5126] = 4; // float32

function typedArrayCode (data) {
  return arrayTypes[Object.prototype.toString.call(data)] | 0
}

function copyArray (out, inp) {
  for (var i = 0; i < inp.length; ++i) {
    out[i] = inp[i];
  }
}

function transpose (
  result, data, shapeX, shapeY, strideX, strideY, offset) {
  var ptr = 0;
  for (var i = 0; i < shapeX; ++i) {
    for (var j = 0; j < shapeY; ++j) {
      result[ptr++] = data[strideX * i + strideY * j + offset];
    }
  }
}

function wrapBufferState (gl, stats, config) {
  var bufferCount = 0;
  var bufferSet = {};

  function REGLBuffer (type) {
    this.id = bufferCount++;
    this.buffer = gl.createBuffer();
    this.type = type;
    this.usage = GL_STATIC_DRAW;
    this.byteLength = 0;
    this.dimension = 1;
    this.dtype = GL_UNSIGNED_BYTE$1;

    this.persistentData = null;

    if (config.profile) {
      this.stats = {size: 0};
    }
  }

  REGLBuffer.prototype.bind = function () {
    gl.bindBuffer(this.type, this.buffer);
  };

  REGLBuffer.prototype.destroy = function () {
    destroy(this);
  };

  var streamPool = [];

  function createStream (type, data) {
    var buffer = streamPool.pop();
    if (!buffer) {
      buffer = new REGLBuffer(type);
    }
    buffer.bind();
    initBufferFromData(buffer, data, GL_STREAM_DRAW, 0, 1, false);
    return buffer
  }

  function destroyStream (stream$$1) {
    streamPool.push(stream$$1);
  }

  function initBufferFromTypedArray (buffer, data, usage) {
    buffer.byteLength = data.byteLength;
    gl.bufferData(buffer.type, data, usage);
  }

  function initBufferFromData (buffer, data, usage, dtype, dimension, persist) {
    var shape;
    buffer.usage = usage;
    if (Array.isArray(data)) {
      buffer.dtype = dtype || GL_FLOAT$1;
      if (data.length > 0) {
        var flatData;
        if (Array.isArray(data[0])) {
          shape = arrayShape(data);
          var dim = 1;
          for (var i = 1; i < shape.length; ++i) {
            dim *= shape[i];
          }
          buffer.dimension = dim;
          flatData = arrayFlatten(data, shape, buffer.dtype);
          initBufferFromTypedArray(buffer, flatData, usage);
          if (persist) {
            buffer.persistentData = flatData;
          } else {
            pool.freeType(flatData);
          }
        } else if (typeof data[0] === 'number') {
          buffer.dimension = dimension;
          var typedData = pool.allocType(buffer.dtype, data.length);
          copyArray(typedData, data);
          initBufferFromTypedArray(buffer, typedData, usage);
          if (persist) {
            buffer.persistentData = typedData;
          } else {
            pool.freeType(typedData);
          }
        } else if (isTypedArray(data[0])) {
          buffer.dimension = data[0].length;
          buffer.dtype = dtype || typedArrayCode(data[0]) || GL_FLOAT$1;
          flatData = arrayFlatten(
            data,
            [data.length, data[0].length],
            buffer.dtype);
          initBufferFromTypedArray(buffer, flatData, usage);
          if (persist) {
            buffer.persistentData = flatData;
          } else {
            pool.freeType(flatData);
          }
        } else {
          check$1.raise('invalid buffer data');
        }
      }
    } else if (isTypedArray(data)) {
      buffer.dtype = dtype || typedArrayCode(data);
      buffer.dimension = dimension;
      initBufferFromTypedArray(buffer, data, usage);
      if (persist) {
        buffer.persistentData = new Uint8Array(new Uint8Array(data.buffer));
      }
    } else if (isNDArrayLike(data)) {
      shape = data.shape;
      var stride = data.stride;
      var offset = data.offset;

      var shapeX = 0;
      var shapeY = 0;
      var strideX = 0;
      var strideY = 0;
      if (shape.length === 1) {
        shapeX = shape[0];
        shapeY = 1;
        strideX = stride[0];
        strideY = 0;
      } else if (shape.length === 2) {
        shapeX = shape[0];
        shapeY = shape[1];
        strideX = stride[0];
        strideY = stride[1];
      } else {
        check$1.raise('invalid shape');
      }

      buffer.dtype = dtype || typedArrayCode(data.data) || GL_FLOAT$1;
      buffer.dimension = shapeY;

      var transposeData = pool.allocType(buffer.dtype, shapeX * shapeY);
      transpose(transposeData,
        data.data,
        shapeX, shapeY,
        strideX, strideY,
        offset);
      initBufferFromTypedArray(buffer, transposeData, usage);
      if (persist) {
        buffer.persistentData = transposeData;
      } else {
        pool.freeType(transposeData);
      }
    } else {
      check$1.raise('invalid buffer data');
    }
  }

  function destroy (buffer) {
    stats.bufferCount--;

    var handle = buffer.buffer;
    check$1(handle, 'buffer must not be deleted already');
    gl.deleteBuffer(handle);
    buffer.buffer = null;
    delete bufferSet[buffer.id];
  }

  function createBuffer (options, type, deferInit, persistent) {
    stats.bufferCount++;

    var buffer = new REGLBuffer(type);
    bufferSet[buffer.id] = buffer;

    function reglBuffer (options) {
      var usage = GL_STATIC_DRAW;
      var data = null;
      var byteLength = 0;
      var dtype = 0;
      var dimension = 1;
      if (Array.isArray(options) ||
          isTypedArray(options) ||
          isNDArrayLike(options)) {
        data = options;
      } else if (typeof options === 'number') {
        byteLength = options | 0;
      } else if (options) {
        check$1.type(
          options, 'object',
          'buffer arguments must be an object, a number or an array');

        if ('data' in options) {
          check$1(
            data === null ||
            Array.isArray(data) ||
            isTypedArray(data) ||
            isNDArrayLike(data),
            'invalid data for buffer');
          data = options.data;
        }

        if ('usage' in options) {
          check$1.parameter(options.usage, usageTypes, 'invalid buffer usage');
          usage = usageTypes[options.usage];
        }

        if ('type' in options) {
          check$1.parameter(options.type, glTypes, 'invalid buffer type');
          dtype = glTypes[options.type];
        }

        if ('dimension' in options) {
          check$1.type(options.dimension, 'number', 'invalid dimension');
          dimension = options.dimension | 0;
        }

        if ('length' in options) {
          check$1.nni(byteLength, 'buffer length must be a nonnegative integer');
          byteLength = options.length | 0;
        }
      }

      buffer.bind();
      if (!data) {
        gl.bufferData(buffer.type, byteLength, usage);
        buffer.dtype = dtype || GL_UNSIGNED_BYTE$1;
        buffer.usage = usage;
        buffer.dimension = dimension;
        buffer.byteLength = byteLength;
      } else {
        initBufferFromData(buffer, data, usage, dtype, dimension, persistent);
      }

      if (config.profile) {
        buffer.stats.size = buffer.byteLength * DTYPES_SIZES[buffer.dtype];
      }

      return reglBuffer
    }

    function setSubData (data, offset) {
      check$1(offset + data.byteLength <= buffer.byteLength,
        'invalid buffer subdata call, buffer is too small. ' + ' Can\'t write data of size ' + data.byteLength + ' starting from offset ' + offset + ' to a buffer of size ' + buffer.byteLength);

      gl.bufferSubData(buffer.type, offset, data);
    }

    function subdata (data, offset_) {
      var offset = (offset_ || 0) | 0;
      var shape;
      buffer.bind();
      if (Array.isArray(data)) {
        if (data.length > 0) {
          if (typeof data[0] === 'number') {
            var converted = pool.allocType(buffer.dtype, data.length);
            copyArray(converted, data);
            setSubData(converted, offset);
            pool.freeType(converted);
          } else if (Array.isArray(data[0]) || isTypedArray(data[0])) {
            shape = arrayShape(data);
            var flatData = arrayFlatten(data, shape, buffer.dtype);
            setSubData(flatData, offset);
            pool.freeType(flatData);
          } else {
            check$1.raise('invalid buffer data');
          }
        }
      } else if (isTypedArray(data)) {
        setSubData(data, offset);
      } else if (isNDArrayLike(data)) {
        shape = data.shape;
        var stride = data.stride;

        var shapeX = 0;
        var shapeY = 0;
        var strideX = 0;
        var strideY = 0;
        if (shape.length === 1) {
          shapeX = shape[0];
          shapeY = 1;
          strideX = stride[0];
          strideY = 0;
        } else if (shape.length === 2) {
          shapeX = shape[0];
          shapeY = shape[1];
          strideX = stride[0];
          strideY = stride[1];
        } else {
          check$1.raise('invalid shape');
        }
        var dtype = Array.isArray(data.data)
          ? buffer.dtype
          : typedArrayCode(data.data);

        var transposeData = pool.allocType(dtype, shapeX * shapeY);
        transpose(transposeData,
          data.data,
          shapeX, shapeY,
          strideX, strideY,
          data.offset);
        setSubData(transposeData, offset);
        pool.freeType(transposeData);
      } else {
        check$1.raise('invalid data for buffer subdata');
      }
      return reglBuffer
    }

    if (!deferInit) {
      reglBuffer(options);
    }

    reglBuffer._reglType = 'buffer';
    reglBuffer._buffer = buffer;
    reglBuffer.subdata = subdata;
    if (config.profile) {
      reglBuffer.stats = buffer.stats;
    }
    reglBuffer.destroy = function () { destroy(buffer); };

    return reglBuffer
  }

  function restoreBuffers () {
    values(bufferSet).forEach(function (buffer) {
      buffer.buffer = gl.createBuffer();
      gl.bindBuffer(buffer.type, buffer.buffer);
      gl.bufferData(
        buffer.type, buffer.persistentData || buffer.byteLength, buffer.usage);
    });
  }

  if (config.profile) {
    stats.getTotalBufferSize = function () {
      var total = 0;
      // TODO: Right now, the streams are not part of the total count.
      Object.keys(bufferSet).forEach(function (key) {
        total += bufferSet[key].stats.size;
      });
      return total
    };
  }

  return {
    create: createBuffer,

    createStream: createStream,
    destroyStream: destroyStream,

    clear: function () {
      values(bufferSet).forEach(destroy);
      streamPool.forEach(destroy);
    },

    getBuffer: function (wrapper) {
      if (wrapper && wrapper._buffer instanceof REGLBuffer) {
        return wrapper._buffer
      }
      return null
    },

    restore: restoreBuffers,

    _initBuffer: initBufferFromData
  }
}

var points = 0;
var point = 0;
var lines = 1;
var line = 1;
var triangles = 4;
var triangle = 4;
var primTypes = {
	points: points,
	point: point,
	lines: lines,
	line: line,
	triangles: triangles,
	triangle: triangle,
	"line loop": 2,
	"line strip": 3,
	"triangle strip": 5,
	"triangle fan": 6
};

var GL_POINTS = 0;
var GL_LINES = 1;
var GL_TRIANGLES = 4;

var GL_BYTE$2 = 5120;
var GL_UNSIGNED_BYTE$3 = 5121;
var GL_SHORT$2 = 5122;
var GL_UNSIGNED_SHORT$2 = 5123;
var GL_INT$2 = 5124;
var GL_UNSIGNED_INT$2 = 5125;

var GL_ELEMENT_ARRAY_BUFFER = 34963;

var GL_STREAM_DRAW$1 = 0x88E0;
var GL_STATIC_DRAW$1 = 0x88E4;

function wrapElementsState (gl, extensions, bufferState, stats) {
  var elementSet = {};
  var elementCount = 0;

  var elementTypes = {
    'uint8': GL_UNSIGNED_BYTE$3,
    'uint16': GL_UNSIGNED_SHORT$2
  };

  if (extensions.oes_element_index_uint) {
    elementTypes.uint32 = GL_UNSIGNED_INT$2;
  }

  function REGLElementBuffer (buffer) {
    this.id = elementCount++;
    elementSet[this.id] = this;
    this.buffer = buffer;
    this.primType = GL_TRIANGLES;
    this.vertCount = 0;
    this.type = 0;
  }

  REGLElementBuffer.prototype.bind = function () {
    this.buffer.bind();
  };

  var bufferPool = [];

  function createElementStream (data) {
    var result = bufferPool.pop();
    if (!result) {
      result = new REGLElementBuffer(bufferState.create(
        null,
        GL_ELEMENT_ARRAY_BUFFER,
        true,
        false)._buffer);
    }
    initElements(result, data, GL_STREAM_DRAW$1, -1, -1, 0, 0);
    return result
  }

  function destroyElementStream (elements) {
    bufferPool.push(elements);
  }

  function initElements (
    elements,
    data,
    usage,
    prim,
    count,
    byteLength,
    type) {
    elements.buffer.bind();
    if (data) {
      var predictedType = type;
      if (!type && (
          !isTypedArray(data) ||
         (isNDArrayLike(data) && !isTypedArray(data.data)))) {
        predictedType = extensions.oes_element_index_uint
          ? GL_UNSIGNED_INT$2
          : GL_UNSIGNED_SHORT$2;
      }
      bufferState._initBuffer(
        elements.buffer,
        data,
        usage,
        predictedType,
        3);
    } else {
      gl.bufferData(GL_ELEMENT_ARRAY_BUFFER, byteLength, usage);
      elements.buffer.dtype = dtype || GL_UNSIGNED_BYTE$3;
      elements.buffer.usage = usage;
      elements.buffer.dimension = 3;
      elements.buffer.byteLength = byteLength;
    }

    var dtype = type;
    if (!type) {
      switch (elements.buffer.dtype) {
        case GL_UNSIGNED_BYTE$3:
        case GL_BYTE$2:
          dtype = GL_UNSIGNED_BYTE$3;
          break

        case GL_UNSIGNED_SHORT$2:
        case GL_SHORT$2:
          dtype = GL_UNSIGNED_SHORT$2;
          break

        case GL_UNSIGNED_INT$2:
        case GL_INT$2:
          dtype = GL_UNSIGNED_INT$2;
          break

        default:
          check$1.raise('unsupported type for element array');
      }
      elements.buffer.dtype = dtype;
    }
    elements.type = dtype;

    // Check oes_element_index_uint extension
    check$1(
      dtype !== GL_UNSIGNED_INT$2 ||
      !!extensions.oes_element_index_uint,
      '32 bit element buffers not supported, enable oes_element_index_uint first');

    // try to guess default primitive type and arguments
    var vertCount = count;
    if (vertCount < 0) {
      vertCount = elements.buffer.byteLength;
      if (dtype === GL_UNSIGNED_SHORT$2) {
        vertCount >>= 1;
      } else if (dtype === GL_UNSIGNED_INT$2) {
        vertCount >>= 2;
      }
    }
    elements.vertCount = vertCount;

    // try to guess primitive type from cell dimension
    var primType = prim;
    if (prim < 0) {
      primType = GL_TRIANGLES;
      var dimension = elements.buffer.dimension;
      if (dimension === 1) primType = GL_POINTS;
      if (dimension === 2) primType = GL_LINES;
      if (dimension === 3) primType = GL_TRIANGLES;
    }
    elements.primType = primType;
  }

  function destroyElements (elements) {
    stats.elementsCount--;

    check$1(elements.buffer !== null, 'must not double destroy elements');
    delete elementSet[elements.id];
    elements.buffer.destroy();
    elements.buffer = null;
  }

  function createElements (options, persistent) {
    var buffer = bufferState.create(null, GL_ELEMENT_ARRAY_BUFFER, true);
    var elements = new REGLElementBuffer(buffer._buffer);
    stats.elementsCount++;

    function reglElements (options) {
      if (!options) {
        buffer();
        elements.primType = GL_TRIANGLES;
        elements.vertCount = 0;
        elements.type = GL_UNSIGNED_BYTE$3;
      } else if (typeof options === 'number') {
        buffer(options);
        elements.primType = GL_TRIANGLES;
        elements.vertCount = options | 0;
        elements.type = GL_UNSIGNED_BYTE$3;
      } else {
        var data = null;
        var usage = GL_STATIC_DRAW$1;
        var primType = -1;
        var vertCount = -1;
        var byteLength = 0;
        var dtype = 0;
        if (Array.isArray(options) ||
            isTypedArray(options) ||
            isNDArrayLike(options)) {
          data = options;
        } else {
          check$1.type(options, 'object', 'invalid arguments for elements');
          if ('data' in options) {
            data = options.data;
            check$1(
                Array.isArray(data) ||
                isTypedArray(data) ||
                isNDArrayLike(data),
                'invalid data for element buffer');
          }
          if ('usage' in options) {
            check$1.parameter(
              options.usage,
              usageTypes,
              'invalid element buffer usage');
            usage = usageTypes[options.usage];
          }
          if ('primitive' in options) {
            check$1.parameter(
              options.primitive,
              primTypes,
              'invalid element buffer primitive');
            primType = primTypes[options.primitive];
          }
          if ('count' in options) {
            check$1(
              typeof options.count === 'number' && options.count >= 0,
              'invalid vertex count for elements');
            vertCount = options.count | 0;
          }
          if ('type' in options) {
            check$1.parameter(
              options.type,
              elementTypes,
              'invalid buffer type');
            dtype = elementTypes[options.type];
          }
          if ('length' in options) {
            byteLength = options.length | 0;
          } else {
            byteLength = vertCount;
            if (dtype === GL_UNSIGNED_SHORT$2 || dtype === GL_SHORT$2) {
              byteLength *= 2;
            } else if (dtype === GL_UNSIGNED_INT$2 || dtype === GL_INT$2) {
              byteLength *= 4;
            }
          }
        }
        initElements(
          elements,
          data,
          usage,
          primType,
          vertCount,
          byteLength,
          dtype);
      }

      return reglElements
    }

    reglElements(options);

    reglElements._reglType = 'elements';
    reglElements._elements = elements;
    reglElements.subdata = function (data, offset) {
      buffer.subdata(data, offset);
      return reglElements
    };
    reglElements.destroy = function () {
      destroyElements(elements);
    };

    return reglElements
  }

  return {
    create: createElements,
    createStream: createElementStream,
    destroyStream: destroyElementStream,
    getElements: function (elements) {
      if (typeof elements === 'function' &&
          elements._elements instanceof REGLElementBuffer) {
        return elements._elements
      }
      return null
    },
    clear: function () {
      values(elementSet).forEach(destroyElements);
    }
  }
}

var FLOAT = new Float32Array(1);
var INT = new Uint32Array(FLOAT.buffer);

var GL_UNSIGNED_SHORT$4 = 5123;

function convertToHalfFloat (array) {
  var ushorts = pool.allocType(GL_UNSIGNED_SHORT$4, array.length);

  for (var i = 0; i < array.length; ++i) {
    if (isNaN(array[i])) {
      ushorts[i] = 0xffff;
    } else if (array[i] === Infinity) {
      ushorts[i] = 0x7c00;
    } else if (array[i] === -Infinity) {
      ushorts[i] = 0xfc00;
    } else {
      FLOAT[0] = array[i];
      var x = INT[0];

      var sgn = (x >>> 31) << 15;
      var exp = ((x << 1) >>> 24) - 127;
      var frac = (x >> 13) & ((1 << 10) - 1);

      if (exp < -24) {
        // round non-representable denormals to 0
        ushorts[i] = sgn;
      } else if (exp < -14) {
        // handle denormals
        var s = -14 - exp;
        ushorts[i] = sgn + ((frac + (1 << 10)) >> s);
      } else if (exp > 15) {
        // round overflow to +/- Infinity
        ushorts[i] = sgn + 0x7c00;
      } else {
        // otherwise convert directly
        ushorts[i] = sgn + ((exp + 15) << 10) + frac;
      }
    }
  }

  return ushorts
}

function isArrayLike (s) {
  return Array.isArray(s) || isTypedArray(s)
}

var GL_COMPRESSED_TEXTURE_FORMATS = 0x86A3;

var GL_TEXTURE_2D = 0x0DE1;
var GL_TEXTURE_CUBE_MAP = 0x8513;
var GL_TEXTURE_CUBE_MAP_POSITIVE_X = 0x8515;

var GL_RGBA = 0x1908;
var GL_ALPHA = 0x1906;
var GL_RGB = 0x1907;
var GL_LUMINANCE = 0x1909;
var GL_LUMINANCE_ALPHA = 0x190A;

var GL_RGBA4 = 0x8