import mplot.visualresources;

mplot::VisualResources manages per-program resources. It manages the FreeType fonts in your program (by managing a map of mplot::gl::VisualFace objects).

This class is a mathplot-internal class and there is typically no access of its methods in mathplot client code.

VisualResources is a singleton class, accessed via the static instance function VisualResources::i(). It comes into existence when the first mplot::Visual accesses it for the first time in a program.

Freetype library management occurs in VisualResources::freetype_init(Visual<>*). Originally I believed that I required only a single Freetype library instance (allocated with the function FT_Init_FreeType). This was the reason for carrying out Freetype library init within the VisualResources class. However, I found it necessary to initialize one Freetype library instance for each mplot::Visual. This suggests that a better design would be for mplot::Visual to own the freetype library pointer/memory. For now, Freetype init remains in VisualResources. The Freetype library instances are stored in a member attribute which is a map of pointers: VisualResources::freetypes. This map uses the Visual instance address pointers as a key.

Another member attribute is faces which maps unique_ptrs to mplot::gl::VisualFace instances with a key which is a tuple of a font identifier (mplot::VisualFont), a font texture resolution and a pointer to the relevant Visual.

VisualResources also manages some resources associated with instanced rendering (an OpenGL 4.3+ feature).