Drag Selection

[heinezen]

Depends on https://github.com/SFTtech/openage/pull/1550

Adds drag selection to the possible inputs.

• [x] Input System
  • [x] Game controller
    • [x] Store drag selection start in game controller
    • [x] Create drag selection events with mouse down/up
    • [x] Send drag select events to gamestate
  • [x] HUD controller
    • [x] Store drag selection start in game controller
    • [x] Convert drag select events to HUD renderer instructions
• [x] Renderer
  • [x] HUD renderer
    • [x] drag selection shader
    • [x] HUD objects
    • [x] render pass
• [x] Gamestate
  • [X] Drag selection event
  • [x] Use Selectable ability

[TheJJ]

has merge conflicts :) another design point: when units die during being selected, intuitively managing and activating the selected unit's status seems better placed at the hud layer. otherwise the dieing must influence the selectability as simulated unit state, instead of the selectability being a flag & then-visible unit data drawn in the hud

[heinezen]

merge conflicts are fixed :)

[heinezen]

another design point: when units die during being selected, intuitively managing and activating the selected unit's status seems better placed at the hud layer. otherwise the dieing must influence the selectability as simulated unit state, instead of the selectability being a flag & then-visible unit data drawn in the hud

Also relevant for the input layer since the selection queue for the controller resides there. This back propagation of the unit state is a bit hard to do across thread boundaries. We can probably manage that via another interface to the presenter though.