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ALLEGRO_VERTEX_CACHE_SIZE - Allegro 5 API
#include <allegro5/allegro_primitives.h> #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.