ALLEGRO_VERTEX_CACHE_SIZE - Allegro 5 API
#define ALLEGRO_VERTEX_CACHE_SIZE 256
Defines the size of the transformation vertex cache for the software renderer.
If you pass less than this many vertices to the primitive rendering functions
you will get a speed boost. This also defines the size of the cache vertex
buffer, used for the high-level primitives. This corresponds to the maximum
number of line segments that will be used to form them.