To-GLSL

To-GLSL is a library for converting Clojure s-expressions to GLSL.

[to-glsl "0.1.0-SNAPSHOT"]

(def basic-vs
  '(do
     (def-attribute vec4 vertex-position)
     (def-attribute vec2 tex-coord-attr)

     (def-uniform mat4 model-view)
     (def-uniform mat4 projection)

     (def-varying (highp vec2) tex-coord)

     (defn main (void [])
       (set! tex-coord tex-coord-attr)
       (set!
         gl/position
         (* projection model-view vertex-position)))))

(def basic-fs
  '(do
     (def-uniform sampler-2D sampler)
     (def-varying (highp vec2) tex-coord)

     (defn main (void [])
       (set! gl/frag-color (texture-2D sampler tex-coord)))))

(require '[to-glsl.core :refer [->glsl]])

(def vs-source (->glsl basic-vs))
(def fs-source (->glsl basic-fs))

defn

(defn add-one (void [(int x)]) (+ x 1))

becomes:

void addOne(int x) {
  x + 1;
}

Note: types must be specified

def

(def float pi 3.14159)

becomes

float pi = 3.14159;

def-varying - like def but creates a varying

def-uniform - like def but creates a uniform

def-attribute - like def but creates an attribute

set!

(set! x 5)

becomes

x = 5;

when

(when (and (= x 10) (= z 30))
  (set! y 20))

becomes

if (x == 10 && z == 30) {
  y = 20;
}

if

(set! y (if (= x 10) 20 10))

becomes

y = x == 10 ? 20 : 10;

and, or, =, +, -, /, *, bit-and, bit-or, bit-xor, bit-not, bit-shift-right, bit-shift-left - all compile into appriate infix form.

inc and dec - compile into ++ and -- repectively.

field

(field vec x)

becomes

vec.x

swizzle

(swizzle vec x z)

becomes

vec.xz

All symbols are automatically converted from kebab case into camel case.

The GLSL gl_ symbols like gl_Position and gl_FragColor can be accessed under the gl/ namespace in kebab case. i.e. gl/frag-color.

To-GLSL doesn't make any attempt to validate the provided code.

Copyright 2019 Jeremy Kross

Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.