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feat: async pathfinding with provisional paths and bit-grid snapshots

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- Add StandableBitGrid: O(1) bit-packed snapshot (~6KB per 50k tiles vs HashMap overhead)
- Implement two-tier pathfinding: sync for short paths (<64 tiles), provisional+async for long paths
- calculate_provisional_path: capped A* returning path to best heuristic node
- calculate_async_path: A* using bit-grid (Send+Sync, no thread_local)
- prepare_paths system: dispatches provisional paths immediately, spawns async for full paths
- poll_async_paths + splice_completed_async_paths: seamless path transition when async completes
- Entities start walking immediately on provisional path while full path computes in background

Architecture:
  FixedUpdate: prepare_paths → update_wandering_targets → movement
  PostUpdate: poll_async_paths → splice_completed_async_paths

Priority: DF-like pathing (immediate movement) > performance > memory
This commit is contained in:
popertots
2026-03-18 16:35:39 +00:00
parent 79a386afa6
commit c902cff908
9 changed files with 626 additions and 2417 deletions
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src/constants.rs
+2 -1
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@@ -4,6 +4,7 @@ pub const TILE_SIZE: f32 = TILE_PIXELS as f32 * PIXEL_RATIO;
pub const ITILE_SIZE: i32 = TILE_SIZE as i32;
pub const SEED: u32 = 420;
pub const PATHFINDER_SHORT_PATH_MAX_TILES: i32 = 100;
pub const PATHFINDER_SHORT_PATH_MAX_TILES: i32 = 64;
pub const PATHFINDER_MAX_NODES: usize = 5000;
pub const PATHFINDER_WAYPOINT_THRESHOLD_TILES: i32 = 100;
pub const PATHFINDER_PROVISIONAL_NODE_LIMIT: usize = 64;