Ultraviolet
Ultraviolet is a Scala 3 to GLSL (versions 100 and 300) transpiler library built on top of Scala 3 inline macros.
You can use Ultraviolet to generate GLSL shader code for any WebGL use case, such as with ShaderToy, but is primarily designed to support Indigo.
All the shader examples and demos in these docs are written in Ultraviolet and presented using Indigo.
The golden rule when writing shaders in Ultraviolet is: Keep It Simple!
GLSL is not a general purpose language like Scala is, and while it's possible to represent most of GLSL in Scala, the opposite is not true.
GLSL is for doing maths on arrays of simple numeric data types and is, as someone else described it, "a very limited programming model."
For all that, it is very good fun. Go forth and do maths and make pretty pictures!
Give me the TL;DR
If you've stumbled across this project and have no idea what all this shader stuff is about:
- A shader program is used to render graphics on a GPU.
- Think of a tiny C-like program that runs for every pixel on the screen.
- Ultraviolet allows you to write those programs in Scala 3, where you would normally use GLSL targeting WebGL in a browser.
Installation
Check the repo for the latest release number, and substitute the x.y.z below accordingly.
sbt
libraryDependencies += "io.indigoengine" %%% "ultraviolet" % "x.y.z"Mill
def ivyDeps = Agg(ivy"io.indigoengine::ultraviolet::x.y.z")Scala-CLI
//> using dep io.indigoengine::ultraviolet:x.y.z