= Texture Management =

== Referencing ==

 * Textures are referenced by file name
 * Material nodes have absolute (!) texture file names in Properties for the textures they reference
 * Textures are not loaded in the backend, only their names are stored

== Data management ==

 * A central cache avoids textures from being loaded multiple times
 * When texture data is needed, the Framebuffer is requested from the cache with the texture's file name (relative file name would be great here) as the key

== Specific use cases ==

The following use cases are relevant:

 * A material is set to use a texture
 * A material is updated to use a different texture: a) the old texture is still referenced somewhere, b) the old texture is no longer referenced
 * The UV editor should display a texture
 * The OpenGL preview rendering for a material needs to use the texture
 * A texture needs to be made available to a rendering engine (e.g. Sunflow)