davidar

davidar

#!/bin/bash
# http://superuser.com/a/1068709/55113
for file in ~/.local/share/applications/*.desktop; do
    CLASS="`grep '^StartupWMClass=' "$file" | cut -d= -f2`"
    if [ -n "$CLASS" ] && ! grep -q xdotool "$file"; then
        EXEC="`grep '^Exec=' "$file"`"
        EXEC="$EXEC \\&\\& xdotool search --sync --classname $CLASS set_window --class $CLASS"
        sed -i~ "s!^Exec=.*!$EXEC!" "$file"
    fi
done

davidar

"""
Polykite Tiling Explorer

Author: OpenAI GPT-4

Description:
This script explores the tiling properties of polykites, specifically those with 8 components.
It generates all possible polykites with 8 components, canonicalizes them to avoid duplicate
analysis, and then computes their isohedral numbers to identify interesting candidates for further
mathematical exploration.

davidar

davidar

// 2022 David A Roberts <https://davidar.io/>

// https://www.jcgt.org/published/0009/03/02/
// https://www.pcg-random.org/
fn pcg(seed: ptr<function, uint>) -> float {
    *seed = *seed * 747796405u + 2891336453u;
    let word = ((*seed >> ((*seed >> 28u) + 4u)) ^ *seed) * 277803737u;
    return float((word >> 22u) ^ word) / float(0xffffffffu);
}

davidar

// Based on the path tracing tutorial series by demofox:
// https://blog.demofox.org/2020/05/25/casual-shadertoy-path-tracing-1-basic-camera-diffuse-emissive/

let MINIMUM_RAY_HIT_TIME = .1;
let FAR_PLANE = 1e4;
let FOV_DEGREES = 90.;
let NUM_BOUNCES = 8;
let RAY_POS_NORMAL_NUDGE = .01;
let NUM_RENDERS_PER_FRAME = 100;
let EXPOSURE = .5;

davidar

// 2022 David A Roberts <https://davidar.io/>

// https://www.shadertoy.com/view/4djSRW
fn hash44(p: float4) -> float4 {
    var p4 = fract(p * float4(.1031, .1030, .0973, .1099));
    p4 = p4 + dot(p4, p4.wzxy+33.33);
    return fract((p4.xxyz+p4.yzzw)*p4.zywx);
}

let dt = 1.;

davidar

fn isfinite(x: f32) -> bool {
    return clamp(x, -3.4e38, 3.4e38) == x;
}

fn hash12(p: float2) -> float {
    var p3  = fract(float3(p.xyx) * .1031);
    p3 += dot(p3, p3.yzx + 33.33);
    return fract((p3.x + p3.y) * p3.z);
}

davidar

/* Partial port of PBRT v3 <https://github.com/mmp/pbrt-v3> to WGSL.

BSD 2-Clause License

Copyright (c) 1998-2015, Matt Pharr, Greg Humphreys, and Wenzel Jakob
Copyright (c) 2022, David A Roberts <https://davidar.io/>

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

davidar

fn pcg_random(seed: ptr<function, uint>) -> float {
    *seed = *seed * 747796405u + 2891336453u;
    let word = ((*seed >> ((*seed >> 28u) + 4u)) ^ *seed) * 277803737u;
    return float((word >> 22u) ^ word) / float(0xffffffffu);
}

// weighted coin flip (bernoulli)
fn flip(state: ptr<function, uint>, p: float) -> bool {
    return pcg_random(state) <= p;
}