pyalot

vec2 pack16(float value){
    float f = clamp(value, 0.0, 1.0)*255.0;
    float digitLow = fract(f);
    float digitHigh = floor(f)/255.0;
    return vec2(digitHigh, digitLow);
}       
    
float unpack16(vec2 value){
    return value.x+value.y/255.0;
}       

pyalot

float checkerSphere(){
    vec3 normal = normalize(vNormal);
    float c = (acos(normal.y)/PI)*20.0;
    float dc = fwidth(c);
    c = mod(c, 2.0);
    c = smoothstep(0.5-dc, 0.5+dc, c) - smoothstep(1.5-dc, 1.5+dc, c);

    vec2 dir = normalize(normal.xz);
    float t = (atan(dir.x, dir.y)/TAU)*40.0;
    float dt = fwidth(t);

pyalot

float lambertNDF(vec3 normal, vec3 dir, float roughness){
    float exponent = getLambertExponent(roughness*PI*0.5);
    float lambert = max(0.0, dot(normal, dir));
    return pow(lambert, exponent);
}


float ggxNDF(vec3 normal, vec3 dir, float roughness){
    float a = roughness*roughness;
    float d = max(0.000001, dot(normal, dir));

pyalot

vec3 shade(vec3 color, float roughness, float metallness){
    float fresnelFactor = 0.93;
    float specularFactor = 0.65;

    vec3 normal = normalize(vNormal);
    vec3 eyeDir = getEyeDir();

    vec3 N = normal;
    vec3 V = -eyeDir;
    vec3 reflected = reflect(eyeDir, normal);

pyalot

createState: (framebuffer, code) ->
    @fw.state
        cull: 'back'
        shader: [
            fs.open('/pbr-tools.shader')
            fs.open('tools.shader')
            """essl
                fragment:
                    void main(){
                        #{code}

pyalot

decodingTable = new Uint8Array(256)
for c, i in 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
    decodingTable[c.charCodeAt(0)] = i

base64decode = (string) ->
    last = string[string.length-2...string.length]
    if last == '=='
        remainder = 2
    else if last[1] == '='
        remainder = 1

pyalot

maskEval = (src) ->
    whitelist = ['Math', 'performance']
    names = []
    for name of window
        if name not in whitelist
            names.push name
    names = names.join(',')
    return eval("(function(){var #{names};return #{src};})").call({})

pyalot

#!/usr/bin/env bash

function countFiles {
    for i in $(pwd)/* ; do
        if [ -d "$i" ]; then
            echo $(find $i -type f | wc -l) $i
        fi
    done
}

pyalot

## create backup of home! ##

## part 1 before reboot, update system ##
apt-get update
apt-get upgrade
shutdown -r now

## part 2 after first reboot install nvidia driver that works ##
apt-add-repository ppa:ubuntu-x-swat/x-updates
apt-get update

pyalot

preprocess: (source) ->
    lines = []
    result = []
    filename = 'no file'
    lineno = 1
    for line in source.split('\n')
        match = line.match /#line (\d+) (.*)/
        if match
            lineno = parseInt(match[1], 10)+1
            filename = match[2]