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lightgl.js

This library makes it easier to quickly prototype WebGL applications. It's lower level than many other WebGL libraries and while it doesn't provide a scene graph, it re-implements OpenGL's modelview/projection matrix stack to provide similar functionality. It also re-introduces some built-in uniforms from GLSL (such as gl_Vertex and gl_ModelViewProjectionMatrix) and OpenGL's immediate mode.

Building the library

  • python build.py: build lightgl.js from the files in the src directory
  • python build.py debug: rebuild the library any time the contents of the src directory change
  • python build.py release: minify the library using Google Closure Compiler, which assumes there is a closure command in your path that runs compiler.jar
  • docco src/*.js: build the documentation, which is generated in the docs directory

The latest lightgl.js build can be found at http://evanw.github.com/lightgl.js/lightgl.js.

Sample code

<!DOCTYPE html>
<html><body>
  <script src="lightgl.js"></script>
  <script>

var angle = 0;
var gl = GL.create();
var mesh = GL.Mesh.cube();
var shader = new GL.Shader('\
  void main() {\
    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\
  }\
', '\
  void main() {\
    gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);\
  }\
');

gl.onupdate = function(seconds) {
  angle += 45 * seconds;
};

gl.ondraw = function() {
  gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
  gl.loadIdentity();
  gl.translate(0, 0, -5);
  gl.rotate(30, 1, 0, 0);
  gl.rotate(angle, 0, 1, 0);

  shader.draw(mesh);
};

gl.fullscreen();
gl.animate();

  </script>
</body></html>

Documentation

The documentation is automatically generated using Docco:

Examples

Available examples: