ShaderBattle

Medium Patterns

Brick wall

A running-bond brick wall: every other row is shifted by half a brick, each brick a slightly different red.

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The target picture for the shader challenge "Brick wall"
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 462 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

Grid
6 bricks across, 10 rows: g = uv * float2(6.0, 10.0)
Offset
g.x += 0.5 * fmod(row, 2.0), row = floor(g.y)
Mortar
saturate(step(f.x, 0.06) + step(f.y, 0.12))
Brick color
lerp(float3(0.65,0.25,0.18), float3(0.8,0.38,0.25), hash(float2(floor(g.x), row)))
Mortar color
float3(0.8, 0.78, 0.72)

Helper functions provided

The toolbox has: hash(). Add them above your frag function with one click.

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

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