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// saveImage.js

const dataURLtoBlob = (dataurl) => {
    var arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],
        bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
    while(n--){
        u8arr[n] = bstr.charCodeAt(n);
    }
    return new Blob([u8arr], {type:mime});
}

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// fov in Radians, camera position in [x, y, z]
const fovHeight = Math.tan(camera.fov / 2) * camera.position[2]  
const fovWidth = fovHeight * camera.aspectRatio

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// From glfx.js : https://github.com/evanw/glfx.js
float random(vec3 scale, float seed) {
	/* use the fragment position for a different seed per-pixel */
	return fract(sin(dot(gl_FragCoord.xyz + seed, scale)) * 43758.5453 + seed);
}
    
float rand(vec2 co){
	return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);
}

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vec3 align(vec3 pos, vec3 dir) {
    vec3 initDir = vec3(1.0, 0.0, 0.0);
    vec3 axis = cross(dir, initDir);
    float angle = acos(dot(dir, initDir));
    return rotate(pos, axis, angle);
}

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float map(float value, float start, float end, float newStart, float newEnd) {
  float percent = (value - start) / (end - start);
  if (percent < 0.0) {
    percent = 0.0;
  }
  if (percent > 1.0) {
    percent = 1.0;
  }
  float newValue = newStart + (newEnd - newStart) * percent;
  return newValue;

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// compression.js
const defaultPrecision = 10;

const encode = (a, b, mPrecision=defaultPrecision) => {
	const precision = mPrecision;
	const base = Math.floor(Math.sqrt(Math.pow(93, precision)));

	let lat = a, lng = b;
	let lng935 = Math.floor( ( parseFloat(lng) +180)*base/360 );
	let lat935 = Math.floor( ( parseFloat(lat) +90)*base/180 );

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const dropArea = window;

const preventDefaults = (e)=> {
	e.preventDefault()
	e.stopPropagation();
}

;['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
	dropArea.addEventListener(eventName, preventDefaults, false);
})

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#extension GL_EXT_shader_texture_lod : enable

uniform samplerCube uRadianceMap;
uniform samplerCube uIrradianceMap;

#define saturate(x) clamp(x, 0.0, 1.0)
#define PI 3.1415926535897932384626433832795


const float A = 0.15;

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vec4 when_eq(vec4 x, vec4 y) {
  return 1.0 - abs(sign(x - y));
}

vec4 when_neq(vec4 x, vec4 y) {
  return abs(sign(x - y));
}

vec4 when_gt(vec4 x, vec4 y) {
  return max(sign(x - y), 0.0);

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               R            G            B
Silver      0.971519    0.959915    0.915324
Aluminium   0.913183    0.921494    0.924524
Gold        1           0.765557    0.336057
Copper      0.955008    0.637427    0.538163
Chromium    0.549585    0.556114    0.554256
Nickel      0.659777    0.608679    0.525649
Titanium    0.541931    0.496791    0.449419
Cobalt      0.662124    0.654864    0.633732
Platinum    0.672411    0.637331    0.585456