Easy Patterns

Checkerboard with scanlines

A picture built in steps: draw checkerboard, then color it, then finish with scanlines. Every step is listed below with its exact numbers.

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The target picture for the shader challenge "Checkerboard with scanlines" — Recreate this picture. You pass at a 99% match, then try to write it in fewer characters than the par.

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 319 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: Pattern: m = abs(fmod(floor(p.x * 9.0) + floor(p.y * 9.0), 2.0))
Step 2: Colors: lerp(float3(0.9, 0.95, 0.95), lerp(float3(0.17, 0.85, 0.67), float3(0.84, 0.15, 0.84), uv.y), m)
Step 3: Finish: col *= 0.8 + 0.2 * step(0.5, frac(uv.y * 60.0))

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.

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How this challenge works

The numbers you need

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