* Checks the utils have been initialized.

* Initializes this module. Safe to call more than once. * @param {!WebGLRenderingContext} ctx A WebGL context. If * you have more than one contex

* Returns true or false if value matches any WebGL enum * @param {*} value Value to check if it might be an enum. * @return {boolean} True if value

Creates image buffer, registers it under the given ID

Creates texture from either image URL or image object

* Destroys morph, returning true if memory freed, else false * where canvas not found and morph was implicitly destroyed

* Detect whether two edges are equal. * Note that when constructing the convex hull, two same edges can only * be of the negative direction.

Locates canvas in DOM, finds WebGL context on it, sets some default state on the context, then returns * canvas, canvas ID and context wrapped u

* @private