OpenGL Insights

588 VII Software Design

not mutually exclusive, meaning that model data can b e kept in system and graphics

memory at the same time. This is particularly useful because it avoids the definition

of two different model structures. For example, algorithms that per form calculations

on the geometry can access the regular or typed array, while rendering algorithms will

use wrapped WebGLBuffer objects. Listing 41.1 shows the data-layer structure.

Access layer. The a ccess layer provides the needed information to generate vertex

attribute and primitive streams that will be fed into the rendering pipeline.

A vertex attribute stream can refer by name to a ver ...