WebGL fragment shader scaffolding

Scaffolding code for developing WebGL full-screen fragment shaders. Adapted from GLSL sandbox by Ricardo Cobello aka mr.doob: http://ricardocabello.com/blog/post/714.

Example shader: http://vector.io/shaders/terrain.html

Usage:

Create an HTML file with GLSL fragment shader source code defined in a tag like this: <script id='fragment-shader' type='x-shader/x-fragment'>

Optionally define a <canvas> with id='shader-canvas' for rendering, otherwise one will be automatically added to the document.

After your shader script tag, include the scaffold file to compile & start the render loop: <script src="scaffold.js"></script>

The fragment shader will be passed a few standard paramters:

• seed: a random number initialized on load
• start_time: epoch time when program started
• time: epoch time for current frame
• resolution: xy resolution of viewport