Skip to content

Instantly share code, notes, and snippets.

View pfreema1's full-sized avatar

Paul Freeman pfreema1

6 followers · 5 following
View GitHub Profile
@aferriss
aferriss / levels.glsl
Created April 26, 2017 23:20
GLSL Photoshop Style Levels Adjustment
vec3 gammaCorrect(vec3 color, float gamma){
return pow(color, vec3(1.0/gamma));
}
vec3 levelRange(vec3 color, float minInput, float maxInput){
return min(max(color - vec3(minInput), vec3(0.0)) / (vec3(maxInput) - vec3(minInput)), vec3(1.0));
}
vec3 finalLevels(vec3 color, float minInput, float gamma, float maxInput){
return gammaCorrect(levelRange(color, minInput, maxInput), gamma);
@ayamflow
ayamflow / gist:96a1f554c3f88eef2f9d0024fc42940f
Last active May 15, 2024 12:37
Threejs Fit plane to screen
var cameraZ = camera.position.z;
var planeZ = 5;
var distance = cameraZ - planeZ;
var aspect = viewWidth / viewHeight;
var vFov = camera.fov * Math.PI / 180;
var planeHeightAtDistance = 2 * Math.tan(vFov / 2) * distance;
var planeWidthAtDistance = planeHeightAtDistance * aspect;
// or
@julien
julien / metaballs.glsl
Created October 29, 2016 12:24
simple metaball shader
precision highp float;
uniform float time;
uniform vec2 mouse;
uniform vec2 resolution;
float ball(vec2 p, float fx, float fy, float ax, float ay) {
vec2 r = vec2(p.x + sin(time * fx) * ax, p.y + cos(time * fy) * ay);
return 0.09 / length(r);
}
@activetheory
activetheory / levels.glsl
Created January 5, 2016 00:06
A GLSL module for color levels manipulation
float levelChannel(float inPixel, float inBlack, float inGamma, float inWhite, float outBlack, float outWhite) {
return (pow(((inPixel * 255.0) - inBlack) / (inWhite - inBlack), inGamma) * (outWhite - outBlack) + outBlack) / 255.0;
}
vec3 levels(vec3 inPixel, float inBlack, float inGamma, float inWhite, float outBlack, float outWhite) {
vec3 o = vec3(1.0);
o.r = levelChannel(inPixel.r, inBlack, inGamma, inWhite, outBlack, outWhite);
o.g = levelChannel(inPixel.g, inBlack, inGamma, inWhite, outBlack, outWhite);
o.b = levelChannel(inPixel.b, inBlack, inGamma, inWhite, outBlack, outWhite);
return o;
@joseluisq
joseluisq / terminal-git-branch-name.md
Last active October 5, 2024 07:09
Add Git Branch Name to Terminal Prompt (Linux/Mac)

Add Git Branch Name to Terminal Prompt (Linux/Mac)

image

Open ~/.bash_profile in your favorite editor and add the following content to the bottom.

# Git branch in prompt.

parse_git_branch() {
@evanscottgray
evanscottgray / docker_kill.sh
Last active November 7, 2023 03:40
kill all docker containers at once...
docker ps | awk {' print $1 '} | tail -n+2 > tmp.txt; for line in $(cat tmp.txt); do docker kill $line; done; rm tmp.txt
@geoffb
geoffb / simple-canvas-rotation.html
Last active February 23, 2023 20:56
A simple example of rotating a rectangle using HTML5 canvas.
<!DOCTYPE html>
<html>
<head>
<title>HTML5 Canvas Transformation</title>
</head>
<body>
<script>
// Create our canvas and append it to the document body
var stage = document.createElement("canvas");
@albrow
albrow / confirm.go
Last active April 16, 2023 03:03
Go (golang): How to ask for user confirmation via command line
import (
"fmt"
"log"
"os"
"sort"
)
// askForConfirmation uses Scanln to parse user input. A user must type in "yes" or "no" and
// then press enter. It has fuzzy matching, so "y", "Y", "yes", "YES", and "Yes" all count as
// confirmations. If the input is not recognized, it will ask again. The function does not return