Gliss

A GLSL Lexer and Parser

Dependencies

None! You can easily copy and paste this code into another build system without much hassle.

Building

1. Install ib

2. Install clang

3. Run the build. To build on osx, use osx-debug config

# Use default debug config
ib gliss/test/lexer-test

# Use osx-debug config
ib gliss/test/lexer-test --cfg osx-debug.cfg

1. If you modify the grammar file docs/glsl.biglr be sure to regenerate the parser using the provided script.

./regenerate_parser.sh

Building the NodeJS Module

Requires nodejs and emscripten

./build_js_binding.sh

View Language Docs

./view_parser_doc.sh

Getting Started

#include <iostream>
#include <gliss/parser.h>
 
using namespace gliss;
 
int main() {
  auto output = parser_t::parse_string(R"(
    uniform mat4 viewMatrix, projMatrix;
 
    in vec4 position;
    in vec3 color;
 
    out vec3 Color;
 
    void main() {
      Color = color;
      gl_Position = projMatrix * viewMatrix * position;
    }
  )");
 
  std::cout << output->get_name() << std::endl;
 
  return 0;
}

Use the NodeJS Binding!

npm install gliss

Generate an AST from GLSL source code

const gliss = require('gliss');

const ast = gliss.parse_glsl(`
  #ifdef GL_ES
  precision mediump float;
  #endif
  #extension GL_OES_standard_derivatives : enable
  uniform float time;
  uniform vec2 mouse;
  uniform vec2 resolution;
  void main( void ) {
    vec2 pos = gl_FragCoord.xy/resolution.xy;
    vec2 dif = pos - mouse;
    float dist = 1.0-length(dif);
    float power = pow(dist, 10.0);
    float pulse = sin(time*20.0);
    gl_FragColor = vec4(pos*dist, pulse*power, 1.0);
  }
`);

console.log(ast);