hylogen

by sleexyz

sleexyz / hylogen

GLSL embedded in Haskell

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H Y L O G E N

An embedding of GLSL in Haskell.

H Y L I D E

A live coding environment for writing shaders with Hylogen.



Install

Build from source, using Stack:

  1. Install stack
  2. git clone https://github.com/sleexyz/hylogen.git
  3. cd hylogen
  4. stack build

This is the recommended method of using Hylogen, because using Stack you can share your projects and be confident that others will be using the same version of Hylogen as you. To install it to your system so it can be used anywhere, not just inside the

hylogen
folder, use
stack install
instead of
stack build
.

Hylogen can also be installed to your system using the Haskell Platform:

  1. Install the Haskell Platform
  2. cabal update && cabal install hylogen hylide

Example

Here's a simple Hylogen shader to be used with Hylide, saved as

Example.hs
(available in the
examples/
directory):
module Example where
import Hylogen.WithHylide

output :: Program output = toProgram color

color :: Vec4 color = vec4 (a, a, a, 1) where k = 20 f = (*k) . sin . (/k) a = sum [ cos (x_ uvN * f time + x_ mouse ) , sin (y_ uvN * f time + y_ mouse ) ]

Run Hylide:

$ stack exec hylide Example.hs

If Hylide was installed using the haskell platform, you can omit

stack exec
:
$ hylide Example.hs

Now go to localhost:5678 in your browser. You'll see a live rendering of the corresponding generated GLSL:

void main() {
    float _7 = uvN.x;
    float _10 = (time / 20.0);
    float _9 = sin(_10);
    float _8 = (_9 * 20.0);
    float _6 = (_7 * _8);
    float _11 = mouse.x;
    float _5 = (_6 + _11);
    float _4 = cos(_5);
    float _3 = (0.0 + _4);
    float _15 = uvN.y;
    float _18 = (time / 20.0);
    float _17 = sin(_18);
    float _16 = (_17 * 20.0);
    float _14 = (_15 * _16);
    float _19 = mouse.y;
    float _13 = (_14 + _19);
    float _12 = sin(_13);
    float _2 = (_3 + _12);
    vec4 _1 = vec4(_2, _2, _2, 1.0);

gl_FragColor = _1;

}

Hylide will recompile on changes to the Haskell source, sending generated GLSL to the WebGL client over websockets.

References

  • The_Force by Shawn Lawson. This was the initial inspiration for Hylide.
  • data-reify for type-safe observable sharing.

Conceived of at the Recurse Center :)

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