Graphics Paging v2

The existing system can be improved in a number of ways:

• Apply changes iteratively instead of in a single frame, keeping frame-rate smoother.
• Separate the priority and draw range for different components of a plot. e.g. Keep units and city pages in at further distance.
• Parameterize all the settings.
• Introduce an eviction function, not just using age. e.g. Distance from camera + ownership + age

How will it work?

First introduce a cleaner interface for controlling the graphics of a plot. A bitmask for currently active components vs active components for instance, with a single function to toggle them.

Integrate all paging information into the plots, don't need separate arrays etc. Iterating over all plots on the map every frame to perform paging isn't a big deal, 200 x 100 map is only 20000.

Pseudo code:

for each component:
    for each plot in component range of view center plot:
        plot.show_component(component)

if memory free < desired:
    evictable = plots where any component is out side its view range ordered descending by eviction_function
    while memory free < desired and not evictable.empty: