135 lines
3.7 KiB
GDScript
135 lines
3.7 KiB
GDScript
class_name EditableTerrain extends Node
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##
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## Blank sample value.
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##
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const BLANK := Color(0.0, 0.0, 0.0, 0.0)
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var _image := Image.create(1, 1, false, Image.FORMAT_RGBAF)
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##
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## Tracked [TerrainInstance3D] to echo all terrain editing changes to.
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##
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var instance: TerrainInstance3D = null:
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get:
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return instance
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set(value):
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if (value != null) and (value != instance):
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value.terrain_map = ImageTexture.create_from_image(_image)
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instance = value
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##
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## Width and height of the editable terrain in units.
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##
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var size := Vector2i.ZERO:
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get:
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return size
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set(value):
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_image.resize(value.x, value.y)
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if instance != null:
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instance.size = value
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instance.terrain_map = ImageTexture.create_from_image(_image)
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size = value
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func _get_brush_area(point: Vector2i, mask_size: Vector2i, scale: float) -> Rect2i:
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# Convert worldspace point to image-space coordinates for mask.
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var scaled_mask_size := Vector2i(mask_size * scale)
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return Rect2i((point + Vector2i(size * 0.5)) - Vector2i(scaled_mask_size * 0.5), scaled_mask_size)
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func _init() -> void:
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clear(BLANK)
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##
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## Clears the image to the value of [code]clear_color[/code].
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##
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func clear(clear_color: Color) -> void:
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_image.fill(clear_color)
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if instance != null:
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instance.terrain_map.update(_image)
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##
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##
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##
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func oscillate(point: Vector2i, level: float,
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mask: Image, scale: float, intensity: float, delta: float) -> void:
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var mask_size := mask.get_size()
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var brush_source := _get_brush_area(point, mask_size, scale)
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if brush_source.has_area():
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var brush_target := Rect2i(Vector2i.ZERO, size).intersection(brush_source)
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if brush_target.has_area():
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var mask_ratio := mask_size / brush_source.size
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var offset := brush_target.position - brush_source.position
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for y in brush_target.size.y:
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var mask_y := int((offset.y + y) * mask_ratio.y)
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for x in brush_target.size.x:
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var coord := brush_target.position + Vector2i(x, y)
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var pixel := _image.get_pixelv(coord)
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_image.set_pixelv(coord, Color(pixel.r, pixel.g, pixel.b,
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lerpf(pixel.a, level, intensity * delta *\
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mask.get_pixel(int((offset.x + x) * mask_ratio.x), mask_y).a)).clamp())
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if instance != null:
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instance.terrain_map.update(_image)
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##
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##
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##
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func paint(point: Vector2i, color: Color,
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mask: Image, scale: float, intensity: float, delta: float) -> void:
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var mask_size := mask.get_size()
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var brush_source := _get_brush_area(point, mask_size, scale)
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if brush_source.has_area():
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var brush_target := Rect2i(Vector2i.ZERO, size).intersection(brush_source)
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if brush_target.has_area():
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var mask_ratio := mask_size / brush_source.size
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var offset := brush_target.position - brush_source.position
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for y in brush_target.size.y:
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var mask_y := int((offset.y + y) * mask_ratio.y)
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for x in brush_target.size.x:
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var coord := brush_target.position + Vector2i(x, y)
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var pixel := _image.get_pixelv(coord)
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var mask_intensity_delta := intensity * delta *\
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mask.get_pixel(int((offset.x + x) * mask_ratio.x), mask_y).a
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_image.set_pixelv(coord, Color(
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lerpf(pixel.r, color.r, mask_intensity_delta),
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lerpf(pixel.g, color.g, mask_intensity_delta),
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lerpf(pixel.b, color.b, mask_intensity_delta), pixel.a).clamp())
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if instance != null:
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instance.terrain_map.update(_image)
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##
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## Samples the color value in the editable terrain at the worldspace [code]point[/code], returning
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## its respective [Color] value.
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##
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## For sample coordinates outside of the terrain map worldspace, [code]BLANK[/code] is returned
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## instead.
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##
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func sample(point: Vector2i) -> Color:
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var image_point := point + Vector2i(size * 0.5)
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if Rect2i(Vector2i.ZERO, size).has_point(image_point):
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return _image.get_pixelv(image_point)
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return BLANK
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