54 lines
2.0 KiB
GDScript
54 lines
2.0 KiB
GDScript
class_name TerrainChunkLodPlanner
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extends RefCounted
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## Pure linear desired-state planner for parsed ADT chunk records.
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const POLICY_SCRIPT := preload("res://src/render/terrain/terrain_chunk_lod_policy.gd")
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const GODOT_WORLD_POSITION_SCRIPT := preload("res://src/domain/coordinates/godot_world_position.gd")
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## Maps source chunk indices to LOD 0/1/2 using horizontal distance from the
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## typed focus to each chunk center. Empty/out-of-range chunks remain absent.
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func plan(
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chunks: Array,
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focus_position: RefCounted,
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policy: RefCounted
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) -> Dictionary:
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if (
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focus_position == null
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or focus_position.get_script() != GODOT_WORLD_POSITION_SCRIPT
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or policy == null
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or policy.get_script() != POLICY_SCRIPT
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or not bool(policy.get("is_enabled"))
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):
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return {}
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var chunk_size_units := float(policy.get("chunk_size_units"))
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var lod0_radius_squared := (float(policy.get("lod0_radius_chunks")) * chunk_size_units) ** 2
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var lod1_radius_squared := (float(policy.get("lod1_radius_chunks")) * chunk_size_units) ** 2
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var lod2_radius_squared := (float(policy.get("lod2_radius_chunks")) * chunk_size_units) ** 2
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var focus_x_units := float(focus_position.get("x_units"))
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var focus_z_units := float(focus_position.get("z_units"))
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var desired_lods: Dictionary = {}
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for chunk_id in range(chunks.size()):
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var chunk: Dictionary = chunks[chunk_id]
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if chunk.is_empty():
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continue
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var origin: Vector3 = chunk.get("origin", Vector3.ZERO)
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var center_x_units := origin.x + chunk_size_units * 0.5
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var center_z_units := origin.z + chunk_size_units * 0.5
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var delta_x_units := center_x_units - focus_x_units
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var delta_z_units := center_z_units - focus_z_units
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var distance_squared_units := (
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delta_x_units * delta_x_units + delta_z_units * delta_z_units
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)
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if distance_squared_units <= lod0_radius_squared:
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desired_lods[chunk_id] = 0
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elif distance_squared_units <= lod1_radius_squared:
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desired_lods[chunk_id] = 1
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elif distance_squared_units <= lod2_radius_squared:
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desired_lods[chunk_id] = 2
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return desired_lods
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