Easy Filters
Pixelated circle outline with a dark vignette
A picture built in steps: pixelate, then draw circle outline, then color it, then finish with a dark vignette. Every step is listed below with its exact numbers.
How this challenge works
You write a fragment shader that draws the picture above, live in your browser. A match bar shows how close you are, and the score combines accuracy, code size (the par is 381 characters in Unity (Built-in)) and GPU speed. Work in HLSL, GLSL, WGSL, Metal or Godot and export the result when you are done.
The numbers you need
- Space
p = (uv - 0.5) * float2(aspect, 1.0)- Step 1: Pixelate
p = (floor(p * 16.0) + 0.5) / 16.0 (snap the position to a grid of 16 blocks per unit)- Step 2: Pattern
d = length(p) - 0.34; m = 1.0 - smoothstep(0.012, 0.02, abs(d))- Step 3: Colors
lerp(float3(0.87, 0.33, 0.68), float3(0.58, 0.88, 0.4), m)- Step 4: Finish
col *= 1.0 - 0.6 * smoothstep(0.35, 0.85, length(s)), s = (uv - 0.5) * float2(aspect, 1.0)
Solve it in your language
Unity (Built-in), Unity (URP), Unreal, Shadertoy / WebGL, OpenGL (LWJGL, raylib), three.js, GameMaker, LÖVE (Lua), Godot, Apple (iOS, macOS), WebGPU / Bevy.
Start coding