88 lines
2.1 KiB
GDScript
88 lines
2.1 KiB
GDScript
class_name TerrainInstance3D extends GeometryInstance3D
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##
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## Identifier constant for a paint slot channel.
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##
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enum PaintSlot {
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ERASE,
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RED,
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GREEN,
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BLUE,
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}
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const _DETAIL := 2
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var _albedo_map_textures: Array[Texture2D] = [null, null, null, null]
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var _material := ShaderMaterial.new()
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var _normal_map_textures: Array[Texture2D] = [null, null, null, null]
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var _mesh := PlaneMesh.new()
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##
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## The height scale range that is used to determine the minimums and maximums of the terrain map.
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##
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@export
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var height_scale := 100.0:
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get:
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return height_scale
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set(value):
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_material.set_shader_parameter("MAX_HEIGHT", value)
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height_scale = max(value, 0.0)
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var _size := Vector2i.ZERO
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func _init() -> void:
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_material.shader = preload("res://terrain/terrain.gdshader")
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RenderingServer.instance_set_base(get_instance(), _mesh)
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_mesh.surface_set_material(0, _material)
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##
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## Returns the size of the terrain mesh (as in-engine units).
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##
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func get_size() -> Vector2i:
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return _size
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##
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## Attempts to resize the terrain to be equal to [code]size[/code] (in-engine units), with
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## [code]Vector2i.ONE[/code] as the minimum size.
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##
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func resize(size: Vector2i) -> void:
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var width := maxi(size.x, 1)
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var height := maxi(size.y, 1)
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if (width != _size.x) or (height != _size.y):
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_mesh.subdivide_width = width * _DETAIL
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_mesh.subdivide_depth = height * _DETAIL
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_mesh.size = size
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_material.set_shader_parameter("SIZE", Vector2(size))
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_size = size
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##
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## Updates the paint used by the paint channel identified by [code]paint_slot[/code] to
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## [code]terrain_paint[/code].
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##
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func update_paint(paint_slot: PaintSlot, paint: TerrainPaint) -> void:
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if paint == null:
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_albedo_map_textures[paint_slot] = null
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_normal_map_textures[paint_slot] = null
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else:
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_albedo_map_textures[paint_slot] = paint.albedo_map
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_normal_map_textures[paint_slot] = paint.normal_map
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_material.set_shader_parameter("ALBEDO_MAPS", _albedo_map_textures)
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_material.set_shader_parameter("NORMAL_MAPS", _normal_map_textures)
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##
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## Updates the terrain map to [code]terrain_map[/code].
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##
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func update_terrain(terrain_map: Texture2D) -> void:
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_material.set_shader_parameter("TERRAIN_MAP", terrain_map)
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