black.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://cj72ibo3c6x8e"
+path="res://.godot/imported/black.png-19a8df0b1a4edb74ea2eecb66d46d03d.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://black.png"
+dest_files=["res://.godot/imported/black.png-19a8df0b1a4edb74ea2eecb66d46d03d.ctex"]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

editor/brush_hard_circle_mask.png.import

@@ -0,0 +1,14 @@
+[remap]
+
+importer="image"
+type="Image"
+uid="uid://drok88h02tdre"
+path="res://.godot/imported/brush_hard_circle_mask.png-e647df7b970f00cdf2f3f2ac38ad8257.image"
+
+[deps]
+
+source_file="res://editor/brush_hard_circle_mask.png"
+dest_files=["res://.godot/imported/brush_hard_circle_mask.png-e647df7b970f00cdf2f3f2ac38ad8257.image"]
+
+[params]
+

editor/brush_soft_circle_mask.png.import

@@ -0,0 +1,14 @@
+[remap]
+
+importer="image"
+type="Image"
+uid="uid://bbdh4btpg08do"
+path="res://.godot/imported/brush_soft_circle_mask.png-5af527bedd556c2d7ed38b029e34527e.image"
+
+[deps]
+
+source_file="res://editor/brush_soft_circle_mask.png"
+dest_files=["res://.godot/imported/brush_soft_circle_mask.png-5af527bedd556c2d7ed38b029e34527e.image"]
+
+[params]
+

player_controller.gd

@@ -72,6 +72,7 @@ var movement_smoothing := 0.5
 ##
 ## Whether or not player movement input processed by the controller should be ignored.
 ##
+@export
 var frozen := false
 
 func _input(event: InputEvent) -> void:

project.godot

@@ -9,6 +9,16 @@
 config_version=5
 
 _global_script_classes=[{
+"base": "TerrainInstance3D",
+"class": &"DynamicTerrainInstance3D",
+"language": &"GDScript",
+"path": "res://terrain/dynamic_terrain_instance_3d.gd"
+}, {
+"base": "HFlowContainer",
+"class": &"ItemSelection",
+"language": &"GDScript",
+"path": "res://user_interface/button_selection.gd"
+}, {
 "base": "Node3D",
 "class": &"PlayerController",
 "language": &"GDScript",
@@ -22,18 +32,27 @@ _global_script_classes=[{
 "base": "GeometryInstance3D",
 "class": &"TerrainInstance3D",
 "language": &"GDScript",
-"path": "res://terrain_instance_3d.gd"
+"path": "res://terrain/terrain_instance_3d.gd"
+}, {
+"base": "Resource",
+"class": &"TerrainPaint",
+"language": &"GDScript",
+"path": "res://terrain/paints/terrain_paint.gd"
 }]
 _global_script_class_icons={
+"DynamicTerrainInstance3D": "",
+"ItemSelection": "",
 "PlayerController": "",
 "Settings": "",
-"TerrainInstance3D": ""
+"TerrainInstance3D": "",
+"TerrainPaint": ""
 }
 
 [application]
 
 config/name="Protectorate"
 run/main_scene="res://editor.scn"
+config/use_custom_user_dir=true
 config/features=PackedStringArray("4.0", "Forward Plus")
 config/icon="res://icon.png"
 

terrain/dynamic_terrain_instance_3d.gd

@@ -0,0 +1,126 @@
+class_name DynamicTerrainInstance3D extends TerrainInstance3D
+
+##
+## Blank sample value.
+##
+const BLANK := Color(0.0, 0.0, 0.0, 0.0)
+
+var _editable_image: Image
+
+var _editable_texture: ImageTexture
+
+func _get_brush_area(point: Vector2i, mask_size: Vector2i, mask_scale: float) -> Rect2i:
+	# Convert worldspace point to image-space coordinates for mask.
+	var scaled_mask_size := Vector2i(mask_size * mask_scale)
+
+	return Rect2i((point + Vector2i(get_size() * 0.5)) - Vector2i(scaled_mask_size * 0.5), scaled_mask_size)
+
+func _init() -> void:
+	super._init()
+
+	_editable_image = Image.create(1, 1, false, Image.FORMAT_RGBAF)
+	_editable_texture = ImageTexture.create_from_image(_editable_image)
+
+	super.resize(Vector2i.ONE)
+
+##
+## Clears the terrain map to the value of [code]clear_elevation[/code].
+##
+func clear(clear_elevation: float) -> void:
+	_editable_image.fill(Color(0.0, 0.0, 0.0, clampf(clear_elevation, 0.0, 1.0)))
+	_editable_texture.update(_editable_image)
+
+##
+## Oscillates the height of terrain toward a value of [member height_scale] (multiplied by
+## [code]level[/code]) around the area of [code]point[/code] determined by [code]mask[/code]
+## multiplied by [code]mask_scale[/code] at a rate of [code]intensity[/code].
+##
+func oscillate(point: Vector2i, level: float, mask: Image, mask_scale: float, intensity: float) -> void:
+	var mask_size := mask.get_size()
+	var brush_source := _get_brush_area(point, mask_size, mask_scale)
+
+	if brush_source.has_area():
+		var brush_target := Rect2i(Vector2i.ZERO, get_size()).intersection(brush_source)
+
+		if brush_target.has_area():
+			var mask_ratio := mask_size / brush_source.size
+			var offset := brush_target.position - brush_source.position
+
+			for y in brush_target.size.y:
+				var mask_y := int((offset.y + y) * mask_ratio.y)
+
+				for x in brush_target.size.x:
+					var coord := brush_target.position + Vector2i(x, y)
+					var pixel := _editable_image.get_pixelv(coord)
+
+					_editable_image.set_pixelv(coord, Color(pixel.r, pixel.g, pixel.b,
+						lerpf(pixel.a, level, intensity *\
+							mask.get_pixel(int((offset.x + x) * mask_ratio.x), mask_y).a)).clamp())
+
+		_editable_texture.update(_editable_image)
+
+##
+## Paints the texture of the terrain toward a value of [code]color[/code] multiplied by
+## [code]intensity[/code] around the area of [code]point[/code] determined by [code]mask[/code]
+## multiplied by [code]mask_scale[/code] at a rate of [code]intensity[/code].
+##
+func paint(point: Vector2i, color: Color, mask: Image, mask_scale: float, intensity: float) -> void:
+	var mask_size := mask.get_size()
+	var brush_source := _get_brush_area(point, mask_size, mask_scale)
+
+	if brush_source.has_area():
+		var brush_target := Rect2i(Vector2i.ZERO, get_size()).intersection(brush_source)
+
+		if brush_target.has_area():
+			var mask_ratio := mask_size / brush_source.size
+			var offset := brush_target.position - brush_source.position
+
+			for y in brush_target.size.y:
+				var mask_y := int((offset.y + y) * mask_ratio.y)
+
+				for x in brush_target.size.x:
+					var coord := brush_target.position + Vector2i(x, y)
+					var pixel := _editable_image.get_pixelv(coord)
+
+					var mask_intensity_delta := intensity *\
+						mask.get_pixel(int((offset.x + x) * mask_ratio.x), mask_y).a
+
+					_editable_image.set_pixelv(coord, Color(
+						lerpf(pixel.r, color.r, mask_intensity_delta),
+							lerpf(pixel.g, color.g, mask_intensity_delta),
+								lerpf(pixel.b, color.b, mask_intensity_delta), pixel.a).clamp())
+
+		_editable_texture.update(_editable_image)
+
+##
+## Attempts to resize the terrain geometry and map to be equal to [code]size[/code] (in-engine
+## units), with [code]Vector2i.ONE[/code] as the minimum size.
+##
+## In the process of growing the terrain map, existing edge data will be copied to fill it out.
+##
+func resize(size: Vector2i) -> void:
+	super.resize(size)
+
+	var actual_size := get_size()
+
+	_editable_image.resize(actual_size.x, actual_size.y)
+
+	_editable_texture = ImageTexture.create_from_image(_editable_image)
+
+	update_terrain(_editable_texture)
+
+##
+## Samples the color value in the editable terrain at the worldspace [code]point[/code], returning
+## its respective [Color] value.
+##
+## For sample coordinates outside of the terrain map worldspace, [code]BLANK[/code] is returned
+## instead.
+##
+func sample(point: Vector2i) -> Color:
+	var size := get_size()
+	var image_point := point + Vector2i(size * 0.5)
+
+	if Rect2i(Vector2i.ZERO, size).has_point(image_point):
+		return _editable_image.get_pixelv(image_point)
+
+	return BLANK

terrain/paints/arid_grass_albedo.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://jcmf7j3qo6ea"
+path="res://.godot/imported/arid_grass_albedo.png-532bc188063dc524e2c08228bed13fa7.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://terrain/paints/arid_grass_albedo.png"
+dest_files=["res://.godot/imported/arid_grass_albedo.png-532bc188063dc524e2c08228bed13fa7.ctex"]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

terrain/paints/arid_grass_displacement.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://co0jompch208v"
+path="res://.godot/imported/arid_grass_displacement.png-cad938b62195c0b0f41099d596594b8b.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://terrain/paints/arid_grass_displacement.png"
+dest_files=["res://.godot/imported/arid_grass_displacement.png-cad938b62195c0b0f41099d596594b8b.ctex"]
+
+[params]
+
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+compress/hdr_compression=1
+compress/bptc_ldr=0
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

terrain/paints/arid_grass_normal.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://bh141jkgbmya8"
+path="res://.godot/imported/arid_grass_normal.png-7bf9fdf5f927fea47a2f86a9ffab326e.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://terrain/paints/arid_grass_normal.png"
+dest_files=["res://.godot/imported/arid_grass_normal.png-7bf9fdf5f927fea47a2f86a9ffab326e.ctex"]
+
+[params]
+
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+compress/hdr_compression=1
+compress/bptc_ldr=0
+compress/normal_map=0
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+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

terrain/paints/arid_grass_roughness.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://jdq8kwjo3uap"
+path="res://.godot/imported/arid_grass_roughness.png-40299cbb0e24b392d013d45af79f5444.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://terrain/paints/arid_grass_roughness.png"
+dest_files=["res://.godot/imported/arid_grass_roughness.png-40299cbb0e24b392d013d45af79f5444.ctex"]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

terrain/paints/cobblestone_albedo.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://cs06oiwrord6t"
+path="res://.godot/imported/cobblestone_albedo.png-f0ce6b9d25b0c6c4130e70ff660bcbd6.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://terrain/paints/cobblestone_albedo.png"
+dest_files=["res://.godot/imported/cobblestone_albedo.png-f0ce6b9d25b0c6c4130e70ff660bcbd6.ctex"]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

terrain/paints/cobblestone_displacement.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://mkxbjfwdwkaq"
+path="res://.godot/imported/cobblestone_displacement.png-bcf2e2194862b85cb002d9559d57903b.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://terrain/paints/cobblestone_displacement.png"
+dest_files=["res://.godot/imported/cobblestone_displacement.png-bcf2e2194862b85cb002d9559d57903b.ctex"]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

terrain/paints/cobblestone_normal.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://ukk0161x3eg2"
+path="res://.godot/imported/cobblestone_normal.png-5130e667fa81f7452d15808908f4cb99.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://terrain/paints/cobblestone_normal.png"
+dest_files=["res://.godot/imported/cobblestone_normal.png-5130e667fa81f7452d15808908f4cb99.ctex"]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

terrain/paints/cobblestone_roughness.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://bcybapft8tl2x"
+path="res://.godot/imported/cobblestone_roughness.png-2f09da1d7000b898b80d7b177062e509.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://terrain/paints/cobblestone_roughness.png"
+dest_files=["res://.godot/imported/cobblestone_roughness.png-2f09da1d7000b898b80d7b177062e509.ctex"]
+
+[params]
+
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+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+compress/normal_map=0
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+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

terrain/paints/default_albedo.png.import

@@ -3,8 +3,8 @@
 importer="texture"
 type="CompressedTexture2D"
 uid="uid://bgpk15qrqxly8"
-path.s3tc="res://.godot/imported/prototype_tiles_large_albedo.png-c3984e5db888f4b509766546fda5695b.s3tc.ctex"
+path.s3tc="res://.godot/imported/default_albedo.png-ec7b9bee606a4c8482c5f21d50eaafb2.s3tc.ctex"
-path.etc2="res://.godot/imported/prototype_tiles_large_albedo.png-c3984e5db888f4b509766546fda5695b.etc2.ctex"
+path.etc2="res://.godot/imported/default_albedo.png-ec7b9bee606a4c8482c5f21d50eaafb2.etc2.ctex"
 metadata={
 "imported_formats": ["s3tc", "etc2"],
 "vram_texture": true
@@ -12,8 +12,8 @@ metadata={
 
 [deps]
 
-source_file="res://prototype_tiles_large_albedo.png"
+source_file="res://terrain/paints/default_albedo.png"
-dest_files=["res://.godot/imported/prototype_tiles_large_albedo.png-c3984e5db888f4b509766546fda5695b.s3tc.ctex", "res://.godot/imported/prototype_tiles_large_albedo.png-c3984e5db888f4b509766546fda5695b.etc2.ctex"]
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 [params]
 

terrain/paints/desert_sand_albedo.png.import

@@ -0,0 +1,34 @@
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+
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+type="CompressedTexture2D"
+uid="uid://b8cv4q43fsglu"
+path="res://.godot/imported/desert_sand_albedo.png-1f8394c37b6df0b83ddc4964049fe1fb.ctex"
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+}
+
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+
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terrain/paints/desert_sand_displacement.png.import

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+
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terrain/paints/desert_sand_normal.png.import

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terrain/paints/desert_sand_roughness.png.import

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terrain/paints/dry_mud_albedo.png.import

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terrain/paints/dry_mud_displacement.png.import

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+detect_3d/compress_to=1

terrain/paints/dry_mud_normal.png.import

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+[remap]
+
+importer="texture"
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+uid="uid://c86r5niid1hp1"
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terrain/paints/dry_mud_roughness.png.import

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+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://7xnkstxa6q65"
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+
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+dest_files=["res://.godot/imported/dry_mud_roughness.png-35dfe15111e09484a06efd2f6e55b73b.ctex"]
+
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terrain/paints/terrain_paint.gd

@@ -0,0 +1,13 @@
+class_name TerrainPaint extends Resource
+
+##
+## Terrain albedo map data.
+##
+@export
+var albedo_map: Texture2D = null
+
+##
+## Terrain normal map data.
+##
+@export
+var normal_map: Texture2D = null

terrain/terrain.gdshader

@@ -0,0 +1,57 @@
+shader_type spatial;
+
+const int MAP_COUNT = 4;
+
+uniform sampler2D[MAP_COUNT] ALBEDO_MAPS;
+
+uniform float MAX_HEIGHT = 100.0;
+
+uniform sampler2D[MAP_COUNT] NORMAL_MAPS;
+
+uniform vec2 SIZE;
+
+uniform sampler2D TERRAIN_MAP : hint_default_transparent, repeat_disable;
+
+void fragment() {
+	vec2 uv = UV * (SIZE / 2.0);
+	vec2 uv_alt = uv * -0.5;
+	vec3 splat_map = texture(TERRAIN_MAP, UV).rgb;
+	float blank = clamp(1.0 - splat_map.r - splat_map.g - splat_map.b, 0.0, 1.0);
+
+	ALBEDO = blank * 0.5 * (texture(ALBEDO_MAPS[0], uv).rgb + texture(ALBEDO_MAPS[0], uv_alt).rgb);
+
+	for (int i = 0; i < (MAP_COUNT - 1); i += 1) {
+		int map_index = i + 1;
+
+		ALBEDO += splat_map[i] * 0.5 * (texture(ALBEDO_MAPS[map_index], uv).rgb +
+			texture(ALBEDO_MAPS[map_index], uv_alt).rgb);
+	}
+
+	NORMAL_MAP = blank * 0.5 *
+		(texture(NORMAL_MAPS[0], uv).rgb + texture(NORMAL_MAPS[0], uv_alt).rgb);
+
+	for (int i = 0; i < (MAP_COUNT - 1); i += 1) {
+		int map_index = i + 1;
+
+		NORMAL_MAP += splat_map[i] * 0.5 * (texture(NORMAL_MAPS[map_index], uv).rgb +
+			texture(NORMAL_MAPS[map_index], uv_alt).rgb);
+	}
+}
+
+float height(vec2 uv) {
+	return MAX_HEIGHT * texture(TERRAIN_MAP, uv).a;
+}
+
+void vertex() {
+	VERTEX.y = height(UV);
+
+	vec2 texel_size = UV / SIZE;
+
+	vec4 h = vec4(
+		height(UV + (texel_size * vec2(0, -1))),
+		height(UV + (texel_size * vec2(-1, 0))),
+		height(UV + (texel_size * vec2( 1, 0))),
+		height(UV + (texel_size * vec2( 0, 1))));
+
+	NORMAL = normalize(vec3(h.y - h.z, 2.0, h.x - h.w));
+}

terrain/terrain_instance_3d.gd

@@ -0,0 +1,87 @@
+class_name TerrainInstance3D extends GeometryInstance3D
+
+##
+## Identifier constant for a paint slot channel.
+##
+enum PaintSlot {
+	ERASE,
+	RED,
+	GREEN,
+	BLUE,
+}
+
+const _DETAIL := 2
+
+var _albedo_map_textures: Array[Texture2D] = [null, null, null, null]
+
+var _material := ShaderMaterial.new()
+
+var _normal_map_textures: Array[Texture2D] = [null, null, null, null]
+
+var _mesh := PlaneMesh.new()
+
+##
+## The height scale range that is used to determine the minimums and maximums of the terrain map.
+##
+@export
+var height_scale := 100.0:
+	get:
+		return height_scale
+
+	set(value):
+		_material.set_shader_parameter("MAX_HEIGHT", value)
+
+		height_scale = max(value, 0.0)
+
+var _size := Vector2i.ZERO
+
+func _init() -> void:
+	_material.shader = preload("res://terrain/terrain.gdshader")
+
+	RenderingServer.instance_set_base(get_instance(), _mesh)
+	_mesh.surface_set_material(0, _material)
+
+##
+## Returns the size of the terrain mesh (as in-engine units).
+##
+func get_size() -> Vector2i:
+	return _size
+
+##
+## Attempts to resize the terrain to be equal to [code]size[/code] (in-engine units), with
+## [code]Vector2i.ONE[/code] as the minimum size.
+##
+func resize(size: Vector2i) -> void:
+	var width := maxi(size.x, 1)
+	var height := maxi(size.y, 1)
+
+	if (width != _size.x) or (height != _size.y):
+		_mesh.subdivide_width = width * _DETAIL
+		_mesh.subdivide_depth = height * _DETAIL
+		_mesh.size = size
+
+		_material.set_shader_parameter("SIZE", Vector2(size))
+
+	_size = size
+
+##
+## Updates the paint used by the paint channel identified by [code]paint_slot[/code] to
+## [code]terrain_paint[/code].
+##
+func update_paint(paint_slot: PaintSlot, paint: TerrainPaint) -> void:
+	if paint == null:
+		_albedo_map_textures[paint_slot] = null
+		_normal_map_textures[paint_slot] = null
+
+	else:
+		_albedo_map_textures[paint_slot] = paint.albedo_map
+		_normal_map_textures[paint_slot] = paint.normal_map
+
+	_material.set_shader_parameter("ALBEDO_MAPS", _albedo_map_textures)
+	_material.set_shader_parameter("NORMAL_MAPS", _normal_map_textures)
+
+##
+## Updates the terrain map to [code]terrain_map[/code].
+##
+func update_terrain(terrain_map: Texture2D) -> void:
+	_material.set_shader_parameter("TERRAIN_MAP", terrain_map)

terrain_cursor_emission.png.import

@@ -1,36 +0,0 @@
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-
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-process/fix_alpha_border=true
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-process/normal_map_invert_y=false
-process/hdr_as_srgb=false
-process/hdr_clamp_exposure=false
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terrain_instance_3d.gd

@@ -1,169 +0,0 @@
-@tool
-class_name TerrainInstance3D extends GeometryInstance3D
-
-const _DETAIL := 2
-
-var _mesh := PlaneMesh.new()
-
-var _material := ShaderMaterial.new()
-
-##
-##
-##
-@export
-var size: Vector2i = Vector2i.ZERO:
-	get:
-		return size
-
-	set(value):
-		var width := maxi(value.x, 0)
-		var height := maxi(value.y, 0)
-
-		if (width != size.x) or (height != size.y):
-			if (width == 0) and (height == 0):
-				RenderingServer.instance_set_base(self.get_instance(), RID())
-
-			else:
-				self._mesh.subdivide_width = width * _DETAIL
-				self._mesh.subdivide_depth = height * _DETAIL
-				self._mesh.size = value
-
-				self._material.set_shader_parameter("SIZE", Vector2(value))
-				RenderingServer.instance_set_base(self.get_instance(), self._mesh)
-
-		size = value
-
-##
-##
-##
-@export
-var layer_1_albedo: Texture2D = null:
-	get:
-		return layer_1_albedo
-
-	set(value):
-		self._material.set_shader_parameter("LAYER_1_ALBEDO", value)
-
-		layer_1_albedo = value
-
-##
-##
-##
-@export
-var layer_1_normal_map: Texture2D = null:
-	get:
-		return layer_1_normal_map
-
-	set(value):
-		self._material.set_shader_parameter("LAYER_1_NORMAL_MAP", value)
-
-		layer_1_normal_map = value
-
-##
-##
-##
-@export
-var layer_2_albedo: Texture2D = null:
-	get:
-		return layer_2_albedo
-
-	set(value):
-		self._material.set_shader_parameter("LAYER_2_ALBEDO", value)
-
-		layer_2_albedo = value
-
-##
-##
-##
-@export
-var layer_2_normal_map: Texture2D = null:
-	get:
-		return layer_2_normal_map
-
-	set(value):
-		self._material.set_shader_parameter("LAYER_2_NORMAL_MAP", value)
-
-		layer_2_normal_map = value
-
-##
-##
-##
-@export
-var layer_3_albedo: Texture2D = null:
-	get:
-		return layer_3_albedo
-
-	set(value):
-		self._material.set_shader_parameter("LAYER_3_ALBEDO", value)
-
-		layer_3_albedo = value
-
-##
-##
-##
-@export
-var layer_3_normal_map: Texture2D = null:
-	get:
-		return layer_3_normal_map
-
-	set(value):
-		self._material.set_shader_parameter("LAYER_3_NORMAL_MAP", value)
-
-		layer_3_normal_map = value
-
-##
-##
-##
-@export
-var layer_4_albedo: Texture2D = null:
-	get:
-		return layer_4_albedo
-
-	set(value):
-		self._material.set_shader_parameter("LAYER_4_ALBEDO", value)
-
-		layer_4_albedo = value
-
-##
-##
-##
-@export
-var layer_4_normal_map: Texture2D = null:
-	get:
-		return layer_4_normal_map
-
-	set(value):
-		self._material.set_shader_parameter("LAYER_4_NORMAL_MAP", value)
-
-		layer_4_normal_map = value
-
-##
-##
-##
-@export
-var terrain_map: Texture2D = null:
-	get:
-		return terrain_map
-
-	set(value):
-		self._material.set_shader_parameter("TERRAIN_MAP", value)
-
-		terrain_map = value
-
-##
-##
-##
-@export
-var max_height := 100.0:
-	get:
-		return max_height
-
-	set(value):
-		self._material.set_shader_parameter("MAX_HEIGHT", value)
-
-		max_height = max(value, 0.0)
-
-func _init() -> void:
-	self._material.shader = preload("res://terrain_shader.gdshader")
-
-	self._mesh.surface_set_material(0, self._material)

terrain_shader.gdshader

@@ -1,58 +0,0 @@
-shader_type spatial;
-
-uniform sampler2D LAYER_1_ALBEDO : hint_default_black;
-
-uniform sampler2D LAYER_1_NORMAL_MAP : hint_default_black;
-
-uniform sampler2D LAYER_2_ALBEDO : hint_default_black;
-
-uniform sampler2D LAYER_2_NORMAL_MAP : hint_default_black;
-
-uniform sampler2D LAYER_3_ALBEDO : hint_default_black;
-
-uniform sampler2D LAYER_3_NORMAL_MAP : hint_default_black;
-
-uniform sampler2D LAYER_4_ALBEDO : hint_default_black;
-
-uniform sampler2D LAYER_4_NORMAL_MAP : hint_default_black;
-
-uniform float MAX_HEIGHT = 100.0;
-
-uniform vec2 SIZE;
-
-uniform sampler2D TERRAIN_MAP : hint_default_transparent, repeat_disable;
-
-void fragment() {
-	vec2 uv = UV * SIZE;
-	vec2 uv_alt = uv * -0.25;
-	vec3 splat_map = texture(TERRAIN_MAP, UV).rgb;
-	float blank = clamp(1.0 - splat_map.r - splat_map.g - splat_map.b, 0.0, 1.0);
-
-	ALBEDO = blank * 0.5 * (texture(LAYER_1_ALBEDO, uv).rgb + texture(LAYER_1_ALBEDO, uv_alt).rgb);
-	ALBEDO += splat_map.r * 0.5 * (texture(LAYER_2_ALBEDO, uv).rgb + texture(LAYER_2_ALBEDO, uv_alt).rgb);
-	ALBEDO += splat_map.g * 0.5 * (texture(LAYER_3_ALBEDO, uv).rgb + texture(LAYER_3_ALBEDO, uv_alt).rgb);
-	ALBEDO += splat_map.b * 0.5 * (texture(LAYER_4_ALBEDO, uv).rgb + texture(LAYER_4_ALBEDO, uv_alt).rgb);
-
-	NORMAL_MAP = blank * 0.5 * (texture(LAYER_1_NORMAL_MAP, uv).rgb + texture(LAYER_1_NORMAL_MAP, uv_alt).rgb);
-	NORMAL_MAP += splat_map.r * 0.5 * (texture(LAYER_1_NORMAL_MAP, uv).rgb + texture(LAYER_2_NORMAL_MAP, uv_alt).rgb);
-	NORMAL_MAP += splat_map.g * 0.5 * (texture(LAYER_2_NORMAL_MAP, uv).rgb + texture(LAYER_3_NORMAL_MAP, uv_alt).rgb);
-	NORMAL_MAP += splat_map.b * 0.5 * (texture(LAYER_3_NORMAL_MAP, uv).rgb + texture(LAYER_4_NORMAL_MAP, uv_alt).rgb);
-}
-
-float height(vec2 uv) {
-	return MAX_HEIGHT * texture(TERRAIN_MAP, uv).a;
-}
-
-void vertex() {
-	VERTEX.y = height(UV);
-
-	vec2 texel_size = UV / SIZE;
-
-	vec4 h = vec4(
-		height(UV + (texel_size * vec2(0, -1))),
-		height(UV + (texel_size * vec2(-1, 0))),
-		height(UV + (texel_size * vec2( 1, 0))),
-		height(UV + (texel_size * vec2( 0, 1))));
-
-	NORMAL = normalize(vec3(h.y - h.z, 2.0, h.x - h.w));
-}

user_interface/button_selection.gd

@@ -0,0 +1,75 @@
+@tool
+class_name ItemSelection extends HFlowContainer
+
+##
+## An item has been selected via GUI selection or [method select_item].
+##
+signal item_selected(index: int)
+
+var _button_group := ButtonGroup.new()
+
+##
+## Number of items in the selection.
+##
+var item_count: int:
+	get:
+		return _button_group.get_buttons().size()
+
+func _get_configuration_warnings() -> PackedStringArray:
+	return PackedStringArray()
+
+##
+## Adds a new item with no text and only [code]icon[/code] as the icon to the selection.
+##
+func add_icon_item(icon: Texture2D) -> void:
+	var child_count := get_child_count()
+	var button := Button.new()
+
+	button.icon = icon
+	button.icon_alignment = HORIZONTAL_ALIGNMENT_CENTER
+	button.toggle_mode = true
+	button.button_group = _button_group
+	button.button_pressed = child_count == 0
+
+	button.pressed.connect(func () -> void: select_item(child_count))
+	add_child(button)
+
+##
+## Returns the icon used by the item at [code]index[/code].
+##
+## An assertion is raised if [code]index[/code] is out of bounds from the item count.
+##
+func get_item_icon(index: int) -> Texture2D:
+	var buttons := _button_group.get_buttons()
+
+	assert(index < buttons.size(), "index out of range")
+
+	var button := buttons[index] as Button
+
+	return null if (button == null) else button.icon
+
+##
+## Returns the currently selected item index or [code]-1[/code] if no item is selected. 
+##
+func get_selected_item() -> int:
+	var pressed_button := _button_group.get_pressed_button()
+
+	return -1 if (pressed_button == null) else pressed_button.get_index()
+
+##
+## Selects the item at [code]index[/code], emitting [signal item_selected] at the end.
+##
+## An assertion is raised if [code]index[/code] is out of bounds from the item count.
+##
+func select_item(index: int) -> void:
+	var buttons := _button_group.get_buttons()
+
+	assert(index < buttons.size(), "index out of range")
+
+	var pressed_button := _button_group.get_pressed_button()
+
+	if pressed_button != null:
+		pressed_button.set_pressed_no_signal(false)
+
+	buttons[index].set_pressed_no_signal(true)
+	item_selected.emit(index)

user_interface/screen_cursor.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://crt8tmxbpu1hl"
+path="res://.godot/imported/screen_cursor.png-46ebd33cd7dfb4c0211a698e6d39e483.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://user_interface/screen_cursor.png"
+dest_files=["res://.godot/imported/screen_cursor.png-46ebd33cd7dfb4c0211a698e6d39e483.ctex"]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1