Architectural review
The following diagram presents the architecture that has been built throughout the book:
Globals.js: Defines the global variables gl (WebGL context), prg (ESSL program), and the canvas width (c_width) and height (c_height).
Utils.js: Contains auxiliary functions such as getGLContext which tries to create a WebGL context for a given HTML5 canvas.
WebGLApp.js: It provides three function hooks, namely: configureGLHook, loadSceneHook, and drawSceneHook that define the life cycle of a WebGL application.
As the previous diagram shows these hooks are mapped to JavaScript functions in our web page:
configure: Here we create cameras, lights, ...
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