editor/editable_terrain.gd

@@ -1,7 +1,5 @@
 class_name EditableTerrain extends Node
 
-const _DEFAULT_COLOR := Color(0.0, 0.0, 0.0, 0.5)
-
 ##
 ## Blank sample value.
 ##
@@ -9,14 +7,6 @@ const BLANK := Color(0.0, 0.0, 0.0, 0.0)
 
 var _image := Image.create(1, 1, false, Image.FORMAT_RGBAF)
 
-##
-## Terrain texture channel mixing values.
-##
-## Affects the color that terrain is mixed into during editing operations like [method paint].
-##
-@export
-var channels := Vector3.ZERO
-
 ##
 ## Tracked [TerrainInstance3D] to echo all terrain editing changes to.
 ##
@@ -33,7 +23,6 @@ var instance: TerrainInstance3D = null:
 ##
 ## Width and height of the editable terrain in units.
 ##
-@export
 var size := Vector2i.ZERO:
 	get:
 		return size
@@ -47,51 +36,162 @@ var size := Vector2i.ZERO:
 
 		size = value
 
-func _init() -> void:
-	_image.fill(_DEFAULT_COLOR)
-
-##
-## Mixes the texture [member channels] and raises the terrain by [code]elevation_level[/code] in a
-## brush pattern masked by [code]brush_mask[/code] to the worldspace [code]point[/code] with
-## [code]brush_intensity[/code] as the intensity of the applied effects for a single paint.
-##
-## For continuous painting, a delta value may be supplied to [code]brush_intensity[/code] to avoid
-## issues with variable-rate paint updates.
-##
-func paint(point: Vector2i, elevation_level: float,
-	brush_mask: Image, brush_scale: float, brush_intensity: float) -> void:
-
+func _get_draw_area(point: Vector2i, mask: Image, scale: float) -> Rect2i:
 	# Convert worldspace point to image-space coordinates for brush and calculate drawable area.
-	var brush_mask_size := brush_mask.get_size()
-	var brush_size := brush_mask_size * brush_scale
+	var mask_size := mask.get_size()
+	var scaled_mask_size := mask_size * scale
 
-	var draw_area := Rect2i(Vector2i.ZERO, size).intersection(
-		Rect2i((point - Vector2i(brush_size * 0.5)) + Vector2i(size * 0.5), brush_size))
+	return Rect2i(Vector2i.ZERO, size).intersection(
+		Rect2i((point - Vector2i(scaled_mask_size * 0.5)) + Vector2i(size * 0.5), scaled_mask_size))
+
+func _init() -> void:
+	clear(BLANK)
+
+##
+## Clears the image to the value of [code]clear_color[/code].
+##
+func clear(clear_color: Color) -> void:
+	_image.fill(clear_color)
+
+##
+##
+##
+func erase(point: Vector2i, mask: Image, scale: float, intensity: float, delta: float) -> void:
+	var draw_area := _get_draw_area(point, mask, scale)
 
 	if draw_area.has_area():
-		var scaled_brush_mask_size := brush_mask_size / draw_area.size
-
-		elevation_level = clampf(elevation_level, -1.0, 1.0)
+		var mask_ratio := mask.get_size() / draw_area.size
 
 		for y in draw_area.size.y:
-			var brush_mask_y := int(y * scaled_brush_mask_size.y)
+			var brush_mask_y := int(y * mask_ratio.y)
 
 			for x in draw_area.size.x:
 				var terrain_map_coord := draw_area.position + Vector2i(x, y)
 				var pixel := _image.get_pixelv(terrain_map_coord)
 
-				var mask := brush_mask.get_pixel(
-					int(x * scaled_brush_mask_size.x), brush_mask_y).a
-
-				var mask_intensity := brush_intensity * mask
+				var mask_intensity_delta := intensity *\
+					delta * mask.get_pixel(int(x * mask_ratio.x), brush_mask_y).a
 
 				_image.set_pixelv(terrain_map_coord, Color(
-					lerpf(pixel.r, channels.x, mask_intensity),
-						lerpf(pixel.g, channels.y, mask_intensity),
-							lerpf(pixel.b, channels.z, mask_intensity),
-								lerpf(pixel.a, pixel.a + (elevation_level * mask), brush_intensity)))
+					lerpf(pixel.r, 0.0, mask_intensity_delta),
+						lerpf(pixel.g, 0.0, mask_intensity_delta),
+							lerpf(pixel.b, 0.0, mask_intensity_delta),
+								pixel.a))
 
-			instance.terrain_map.update(_image)
+		instance.terrain_map.update(_image)
+
+##
+##
+##
+func lower(point: Vector2i, mask: Image, scale: float, intensity: float, delta: float) -> void:
+	var draw_area := _get_draw_area(point, mask, scale)
+
+	if draw_area.has_area():
+		var mask_ratio := mask.get_size() / draw_area.size
+
+		for y in draw_area.size.y:
+			var brush_mask_y := int(y * mask_ratio.y)
+
+			for x in draw_area.size.x:
+				var terrain_map_coord := draw_area.position + Vector2i(x, y)
+				var pixel := _image.get_pixelv(terrain_map_coord)
+
+				_image.set_pixelv(terrain_map_coord, Color(pixel.r, pixel.g, pixel.b,
+					lerpf(pixel.a, pixel.a - (intensity *
+						mask.get_pixel(int(x * mask_ratio.x), brush_mask_y).a), delta)))
+
+		instance.terrain_map.update(_image)
+
+##
+##
+##
+func paint_blue(point: Vector2i, mask: Image, scale: float, intensity: float, delta: float) -> void:
+	var draw_area := _get_draw_area(point, mask, scale)
+
+	if draw_area.has_area():
+		var mask_ratio := mask.get_size() / draw_area.size
+
+		for y in draw_area.size.y:
+			var brush_mask_y := int(y * mask_ratio.y)
+
+			for x in draw_area.size.x:
+				var terrain_map_coord := draw_area.position + Vector2i(x, y)
+				var pixel := _image.get_pixelv(terrain_map_coord)
+
+				_image.set_pixelv(terrain_map_coord, Color(
+					pixel.r, pixel.g, lerpf(pixel.b, intensity, delta *\
+						mask.get_pixel(int(x * mask_ratio.x), brush_mask_y).a),
+							pixel.a))
+
+		instance.terrain_map.update(_image)
+
+##
+##
+##
+func paint_green(point: Vector2i, mask: Image, scale: float, intensity: float, delta: float) -> void:
+	var draw_area := _get_draw_area(point, mask, scale)
+
+	if draw_area.has_area():
+		var mask_ratio := mask.get_size() / draw_area.size
+
+		for y in draw_area.size.y:
+			var brush_mask_y := int(y * mask_ratio.y)
+
+			for x in draw_area.size.x:
+				var terrain_map_coord := draw_area.position + Vector2i(x, y)
+				var pixel := _image.get_pixelv(terrain_map_coord)
+
+				_image.set_pixelv(terrain_map_coord, Color(
+					pixel.r, lerpf(pixel.g, intensity, delta *\
+						mask.get_pixel(int(x * mask_ratio.x), brush_mask_y).a),
+							pixel.b, pixel.a))
+
+		instance.terrain_map.update(_image)
+
+##
+##
+##
+func paint_red(point: Vector2i, mask: Image, scale: float, intensity: float, delta: float) -> void:
+	var draw_area := _get_draw_area(point, mask, scale)
+
+	if draw_area.has_area():
+		var mask_ratio := mask.get_size() / draw_area.size
+
+		for y in draw_area.size.y:
+			var brush_mask_y := int(y * mask_ratio.y)
+
+			for x in draw_area.size.x:
+				var terrain_map_coord := draw_area.position + Vector2i(x, y)
+				var pixel := _image.get_pixelv(terrain_map_coord)
+
+				_image.set_pixelv(terrain_map_coord, Color(
+					lerpf(pixel.r, intensity, delta *\
+						mask.get_pixel(int(x * mask_ratio.x), brush_mask_y).a),
+							pixel.g, pixel.b, pixel.a))
+
+		instance.terrain_map.update(_image)
+
+##
+##
+##
+func raise(point: Vector2i, mask: Image, scale: float, intensity: float, delta: float) -> void:
+	var draw_area := _get_draw_area(point, mask, scale)
+
+	if draw_area.has_area():
+		var mask_ratio := mask.get_size() / draw_area.size
+
+		for y in draw_area.size.y:
+			var brush_mask_y := int(y * mask_ratio.y)
+
+			for x in draw_area.size.x:
+				var terrain_map_coord := draw_area.position + Vector2i(x, y)
+				var pixel := _image.get_pixelv(terrain_map_coord)
+
+				_image.set_pixelv(terrain_map_coord, Color(pixel.r, pixel.g, pixel.b,
+					lerpf(pixel.a, pixel.a + (intensity *
+						mask.get_pixel(int(x * mask_ratio.x), brush_mask_y).a), delta)))
+
+		instance.terrain_map.update(_image)
 
 ##
 ## Samples the color value in the editable terrain at the worldspace [code]point[/code], returning
@@ -109,42 +209,23 @@ func sample(point: Vector2i) -> Color:
 	return BLANK
 
 ##
-## Mixes the texture [member channels] and smooths the terrain to [code]smoothing_level[/code] in a
-## brush pattern masked by [code]brush_mask[/code] to the worldspace [code]point[/code] with
-## [code]brush_intensity[/code] as the intensity of the applied effects for a single paint.
 ##
-## For continuous smoothing, a delta value may be supplied to [code]brush_intensity[/code] to avoid
-## issues with variable-rate smooth updates.
 ##
-func smooth(point: Vector2i, smoothing_level: float,
-	brush_mask: Image, brush_scale: float, brush_intensity: float) -> void:
-
-	# Convert worldspace point to image-space coordinates for brush and calculate drawable area.
-	var brush_mask_size := brush_mask.get_size()
-	var brush_size := brush_mask_size * brush_scale
-	var terrain_map_size := _image.get_size()
-
-	var draw_area := Rect2i(Vector2i.ZERO, terrain_map_size).intersection(
-		Rect2i((point - Vector2i(brush_size * 0.5)) +\
-			Vector2i(terrain_map_size * 0.5), brush_size))
+func smooth(point: Vector2i, mask: Image, scale: float, level: float, delta: float) -> void:
+	var draw_area := _get_draw_area(point, mask, scale)
 
 	if draw_area.has_area():
-		var scaled_brush_mask_size := brush_mask_size / draw_area.size
+		var mask_ratio := mask.get_size() / draw_area.size
 
 		for y in draw_area.size.y:
-			var brush_mask_y := int(y * scaled_brush_mask_size.y)
+			var brush_mask_y := int(y * mask_ratio.y)
 
 			for x in draw_area.size.x:
 				var terrain_map_coord := draw_area.position + Vector2i(x, y)
 				var pixel := _image.get_pixelv(terrain_map_coord)
 
-				var mask_intensity := brush_intensity * brush_mask.get_pixel(
-					int(x * scaled_brush_mask_size.x), brush_mask_y).a
-
-				_image.set_pixelv(terrain_map_coord, Color(
-					lerpf(pixel.r, channels.x, mask_intensity),
-						lerpf(pixel.g, channels.y, mask_intensity), 
-							lerpf(pixel.b, channels.z, mask_intensity),
-								lerpf(pixel.a, smoothing_level, mask_intensity)))
+				_image.set_pixelv(terrain_map_coord, Color(pixel.r, pixel.g, pixel.b,
+					lerpf(pixel.a, level, delta * mask.get_pixel(
+						int(x * mask_ratio.x), brush_mask_y).a)))
 
 		instance.terrain_map.update(_image)