210 lines
6.8 KiB
GDScript
210 lines
6.8 KiB
GDScript
class_name MeshGrid extends Node3D
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const _CHUNK_SIZE := 32
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const _GRID_ORIGIN := Vector2(0.5, 0.5)
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##
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## Baked block of meshes making up a segment of the grid.
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##
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class Chunk:
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var _multimesh_instances: Array[MultiMeshInstance] = []
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var _meshes: Array[Mesh] = []
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func _init() -> void:
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_meshes.resize(_CHUNK_SIZE * _CHUNK_SIZE)
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##
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## Invalidates the mesh block, re-baking its contents from the current mesh data set.
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##
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func invalidate(mesh_grid: MeshGrid, coordinate: Vector2i) -> void:
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# TODO: Once this is all lowered into native code, look for ways to parallelize the loops.
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for multimesh_instance in _multimesh_instances:
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RenderingServer.free_rid(multimesh_instance._instance_rid)
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RenderingServer.free_rid(multimesh_instance._multimesh_rid)
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_multimesh_instances.clear()
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# Normalize mesh instance data for the chunk.
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var transforms_by_mesh := {}
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var grid_size := mesh_grid.size
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for i in _meshes.size():
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var mesh := _meshes[i]
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if mesh != null:
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if not(mesh in transforms_by_mesh):
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transforms_by_mesh[mesh] = []
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transforms_by_mesh[mesh].append(Transform3D(Basis.IDENTITY, Vector3(
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(float(coordinate.x * _CHUNK_SIZE) + (i % _CHUNK_SIZE)) -
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(float(grid_size.x) * _GRID_ORIGIN.x), 0.0,
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(float(coordinate.y * _CHUNK_SIZE) + (i / _CHUNK_SIZE)) -
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(float(grid_size.y) * _GRID_ORIGIN.y))))
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# (Re)-bake into multimesh instances for the chunk.
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var scenario_rid := mesh_grid.get_world_3d().scenario
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var global_transform := mesh_grid.global_transform
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for chunk_mesh in transforms_by_mesh:
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var multimesh_instance := MultiMeshInstance.new(
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scenario_rid, chunk_mesh.get_rid(), transforms_by_mesh[chunk_mesh])
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multimesh_instance.set_offset(global_transform)
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_multimesh_instances.append(multimesh_instance)
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##
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## Sets the mesh location in the chunk at the relative [code]coordinatess[/code] to
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## [code]mesh[/code].
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##
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## *Note* that [method Chunk.invalidate] must be called at some point after to visually update
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## the chunk.
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##
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func set_mesh(coordinates: Vector2i, mesh: Mesh) -> void:
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_meshes[(_CHUNK_SIZE * coordinates.y) + coordinates.x] = mesh
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##
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## Specialized multi-mesh instance convenience for use within the mesh grid and its chunks.
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##
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class MultiMeshInstance:
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var _instance_rid := RID()
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var _multimesh_rid := RID()
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func _init(scenario_rid: RID, mesh_rid: RID, transforms: Array) -> void:
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_multimesh_rid = RenderingServer.multimesh_create()
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_instance_rid = RenderingServer.instance_create2(_multimesh_rid, scenario_rid)
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RenderingServer.multimesh_set_mesh(_multimesh_rid, mesh_rid)
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var transform_count := transforms.size()
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RenderingServer.multimesh_allocate_data(_multimesh_rid,
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transform_count, RenderingServer.MULTIMESH_TRANSFORM_3D, true)
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for i in transform_count:
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RenderingServer.multimesh_instance_set_transform(_multimesh_rid, i, transforms[i])
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##
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## Sets the parent transform of all mesh instances under it to [code]offset[/code].
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##
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func set_offset(offset: Transform3D) -> void:
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RenderingServer.instance_set_transform(_instance_rid, offset)
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var _chunks: Array[Chunk] = []
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var _chunks_size := Vector2i.ZERO
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##
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## Size of the mesh grid (in engine units).
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##
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@export
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var size: Vector2i:
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set(value):
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var chunk_size_factor := float(_CHUNK_SIZE)
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_chunks.resize(int(ceilf(value.x / chunk_size_factor) * ceilf(value.y / chunk_size_factor)))
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for i in _chunks.size():
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_chunks[i] = Chunk.new()
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_chunks_size = Vector2i((value / float(_CHUNK_SIZE)).ceil())
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size = value
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func _get_area() -> Rect2i:
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return Rect2i(Vector2i.ZERO, size)
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func _get_chunk(chunk_coordinate: Vector2i) -> Chunk:
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return _chunks[(_chunks_size.x * chunk_coordinate.y) + chunk_coordinate.x]
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func _notification(what: int) -> void:
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match what:
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NOTIFICATION_TRANSFORM_CHANGED:
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for chunk in _chunks:
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for multimesh_instance in chunk._multimesh_instances:
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multimesh_instance.set_offset_transform(global_transform)
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##
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## Clears the entire mesh grid to only contain [code]mesh[/code].
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##
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## [code]null[/code] may be past to [code]mesh[/code] for clearing the mesh grid to nothing.
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##
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## For clearing a specific region of the mesh grid, see [method fill_mesh].
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##
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func clear_mesh(mesh: Mesh) -> void:
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for y in size.y:
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for x in size.x:
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var coordinate := Vector2i(x, y)
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_get_chunk(coordinate / _CHUNK_SIZE).set_mesh(coordinate % _CHUNK_SIZE, mesh)
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for y in _chunks_size.y:
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for x in _chunks_size.x:
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var chunk_coordinate := Vector2i(x, y)
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_get_chunk(chunk_coordinate).invalidate(self, chunk_coordinate)
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##
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## Clears the region of the mesh grid at [code]area[/code] to only contain [code]mesh[/code].
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##
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## [code]null[/code] may be past to [code]mesh[/code] for filling the region to nothing.
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##
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## *Note* that [code]area[/code] *must* be within the area of the of the mesh grid, where
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## [code]Vector2i.ZERO[/code] is the top-left and [member size] [code]- 1[/code] is the bottom-
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## right.
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##
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## For clearing the whole of the mesh grid, see [method clear_mesh].
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##
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func fill_mesh(area: Rect2i, mesh: Mesh) -> void:
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assert(_get_area().encloses(area), "area must be within grid")
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var filled_chunks := BitMap.new()
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filled_chunks.resize(_chunks_size)
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for y in range(area.position.y, area.end.y):
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for x in range(area.position.x, area.end.x):
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var coordinate := Vector2i(x, y)
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var chunk_coordinate := coordinate / _CHUNK_SIZE
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_get_chunk(chunk_coordinate).set_mesh(coordinate % _CHUNK_SIZE, mesh)
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filled_chunks.set_bitv(chunk_coordinate, true)
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for y in _chunks_size.y:
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for x in _chunks_size.x:
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if filled_chunks.get_bit(x, y):
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var chunk_coordinate := Vector2i(x, y)
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_get_chunk(chunk_coordinate).invalidate(self, chunk_coordinate)
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##
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## Plots a single mesh at [code]coordinates[/code] to be [code]mesh[/code], overwriting whatever it
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## previously contained.
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##
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## [code]null[/code] may be past to [code]mesh[/code] for clearing the mesh grid to nothing.
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##
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## *Note* that [code]coordinates[/code] *must* be within the area of the of the mesh grid, where
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## [code]Vector2i.ZERO[/code] is the top-left and [member size] [code]- 1[/code] is the bottom-
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## right.
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##
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## For bulk-setting many meshes at once, see [method fill_mesh] and [method clear_mesh].
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##
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func plot_mesh(coordinates: Vector2i, mesh: Mesh) -> void:
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assert(_get_area().has_point(coordinates), "coordinate must be within grid")
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var chunk_coordinates := coordinates / _CHUNK_SIZE
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var chunk := _get_chunk(chunk_coordinates)
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chunk.set_mesh(coordinates % _CHUNK_SIZE, mesh)
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chunk.invalidate(self, chunk_coordinates)
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##
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## Returns [code]world_position[/code] converted into a coordinate aligned with the [MeshGrid].
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##
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## Note that [code]world_position[/code] values not within the [MeshGrid] will produce grid
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## coordinates outside of the [MeshGrid] bounds as well.
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##
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func world_to_grid(world_position: Vector2) -> Vector2i:
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return Vector2i((world_position + (Vector2(size) * _GRID_ORIGIN)).floor())
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