Add a 3D decals demo (#756)

Co-authored-by: dzil123 <5725958+dzil123@users.noreply.github.com>

3d/decals/README.md

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+# Decals
+
+This demo includes many examples of Decal nodes in action,
+for the purpose of showcasing Godot's rendering capabilities.
+
+The decal filter mode can be adjusted in the top-left corner:
+
+- For games with a pixel art appearance, the Nearest filter mode can be used
+  instead of Linear.
+- Filter modes with Mipmaps prevent decals from looking grainy at a distance, at
+  a small performance cost. When mipmaps are used without anisotropic filtering,
+  decals will look blurry when viewed at oblique angles.
+- Filter modes with Anisotropic don't look grainy at a distance and also avoid
+  looking blurry when viewed at oblique angles. However, filter modes with
+  Anisotropic have a greater performance cost than enabling Mipmaps alone.
+
+Language: GDScript
+
+Renderer: Vulkan Clustered
+
+## Screenshots
+
+![Screenshot](screenshots/decals.png)

3d/decals/decal.tscn

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+[gd_scene load_steps=5 format=3 uid="uid://cblgs4wjl5s1e"]
+
+[ext_resource type="Texture2D" uid="uid://ccgkupemr6e1q" path="res://textures/paint.png" id="1_1ro0v"]
+
+[sub_resource type="Animation" id="Animation_cxvbq"]
+length = 0.001
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("Decal:modulate")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [Color(1, 1, 1, 1)]
+}
+tracks/1/type = "value"
+tracks/1/imported = false
+tracks/1/enabled = true
+tracks/1/path = NodePath("Decal:extents")
+tracks/1/interp = 1
+tracks/1/loop_wrap = true
+tracks/1/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [Vector3(0, 0, 0)]
+}
+
+[sub_resource type="Animation" id="Animation_ev4ve"]
+resource_name = "fade"
+length = 5.0
+tracks/0/type = "method"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath(".")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(5),
+"transitions": PackedFloat32Array(1),
+"values": [{
+"args": [],
+"method": &"queue_free"
+}]
+}
+tracks/1/type = "value"
+tracks/1/imported = false
+tracks/1/enabled = true
+tracks/1/path = NodePath("Decal:modulate")
+tracks/1/interp = 1
+tracks/1/loop_wrap = true
+tracks/1/keys = {
+"times": PackedFloat32Array(0, 5),
+"transitions": PackedFloat32Array(1, 1),
+"update": 0,
+"values": [Color(1, 1, 1, 1), Color(1, 1, 1, 0)]
+}
+tracks/2/type = "value"
+tracks/2/imported = false
+tracks/2/enabled = true
+tracks/2/path = NodePath("Decal:extents")
+tracks/2/interp = 1
+tracks/2/loop_wrap = true
+tracks/2/keys = {
+"times": PackedFloat32Array(0, 0.2),
+"transitions": PackedFloat32Array(0.5, 0.5),
+"update": 0,
+"values": [Vector3(0, 0, 0), Vector3(1, 1, 1)]
+}
+
+[sub_resource type="AnimationLibrary" id="AnimationLibrary_kqdmn"]
+_data = {
+"RESET": SubResource("Animation_cxvbq"),
+"fade": SubResource("Animation_ev4ve")
+}
+
+[node name="DecalHolder" type="Node3D"]
+
+[node name="Decal" type="Decal" parent="."]
+transform = Transform3D(1, 0, 0, 0, -4.37114e-08, -1, 0, 1, -4.37114e-08, 0, 0, 0)
+extents = Vector3(0, 0, 0)
+texture_albedo = ExtResource("1_1ro0v")
+
+[node name="AnimationPlayer" type="AnimationPlayer" parent="."]
+autoplay = "fade"
+libraries = {
+"": SubResource("AnimationLibrary_kqdmn")
+}

3d/decals/default_env.tres

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+[gd_resource type="Environment" load_steps=2 format=2]
+
+[sub_resource type="Sky" id=1]
+
+[resource]
+background_mode = 2
+sky = SubResource( 1 )

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3d/decals/project.godot

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+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=5
+
+_global_script_classes=[]
+_global_script_class_icons={}
+
+[application]
+
+config/name="Decals"
+run/main_scene="res://test.tscn"
+config/features=PackedStringArray("4.0")
+config/icon="res://icon.png"
+
+[display]
+
+window/stretch/mode="canvas_items"
+window/stretch/aspect="expand"
+
+[input]
+
+place_decal={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":80,"unicode":0,"echo":false,"script":null)
+]
+}
+
+[rendering]
+
+textures/default_filters/anisotropic_filtering_level=4
+textures/decals/filter=5
+quality/screen_filters/msaa=3
+environment/default_environment="res://default_env.tres"

3d/decals/tester.gd

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+extends WorldEnvironment
+
+const ROT_SPEED = 0.003
+const ZOOM_SPEED = 0.125
+const MAIN_BUTTONS = MOUSE_BUTTON_MASK_LEFT | MOUSE_BUTTON_MASK_RIGHT | MOUSE_BUTTON_MASK_MIDDLE
+
+var tester_index = 0
+var rot_x = deg_to_rad(-22.5)  # This must be kept in sync with RotationX.
+var rot_y = deg_to_rad(90)  # This must be kept in sync with CameraHolder.
+var zoom = 1.5
+var base_height = ProjectSettings.get_setting("display/window/size/viewport_height")
+
+@onready var testers = $Testers
+@onready var camera_holder = $CameraHolder # Has a position and rotates on Y.
+@onready var rotation_x = $CameraHolder/RotationX
+@onready var camera = $CameraHolder/RotationX/Camera3D
+
+func _ready():
+	camera_holder.transform.basis = Basis.from_euler(Vector3(0, rot_y, 0))
+	rotation_x.transform.basis = Basis.from_euler(Vector3(rot_x, 0, 0))
+	update_gui()
+
+
+func _unhandled_input(event):
+	if event.is_action_pressed("ui_left"):
+		_on_previous_pressed()
+	if event.is_action_pressed("ui_right"):
+		_on_next_pressed()
+
+	if event.is_action_pressed("place_decal"):
+		var origin = camera.global_position
+		var target = camera.project_position(get_viewport().get_mouse_position(), 100)
+
+		var query = PhysicsRayQueryParameters3D.create(origin, target)
+		var result = camera.get_world_3d().direct_space_state.intersect_ray(query)
+
+		if not result.is_empty():
+			var decal = preload("res://decal.tscn").instantiate()
+			add_child(decal)
+			decal.get_node("Decal").modulate = Color(1.0,0.0,0)
+			decal.position = result["position"]
+			decal.transform.basis = camera.global_transform.basis
+
+	if event is InputEventMouseButton:
+		if event.button_index == MOUSE_BUTTON_WHEEL_UP:
+			zoom -= ZOOM_SPEED
+		if event.button_index == MOUSE_BUTTON_WHEEL_DOWN:
+			zoom += ZOOM_SPEED
+		zoom = clampf(zoom, 1.5, 4)
+
+	if event is InputEventMouseMotion and event.button_mask & MAIN_BUTTONS:
+		# Compensate motion speed to be resolution-independent (based on the window height).
+		var relative_motion = event.relative * DisplayServer.window_get_size().y / base_height
+		rot_y -= relative_motion.x * ROT_SPEED
+		rot_x -= relative_motion.y * ROT_SPEED
+		rot_x = clampf(rot_x, deg_to_rad(-90), 0)
+		camera_holder.transform.basis = Basis.from_euler(Vector3(0, rot_y, 0))
+		rotation_x.transform.basis = Basis.from_euler(Vector3(rot_x, 0, 0))
+
+
+func _process(delta):
+	var current_tester = testers.get_child(tester_index)
+	# This code assumes CameraHolder's X and Y coordinates are already correct.
+	var current_position = camera_holder.global_transform.origin.z
+	var target_position = current_tester.global_transform.origin.z
+	camera_holder.global_transform.origin.z = lerpf(current_position, target_position, 3 * delta)
+	camera.position.z = lerpf(camera.position.z, zoom, 10 * delta)
+
+
+func _on_previous_pressed():
+	tester_index = max(0, tester_index - 1)
+	update_gui()
+
+
+func _on_next_pressed():
+	tester_index = min(tester_index + 1, testers.get_child_count() - 1)
+	update_gui()
+
+
+func update_gui():
+	$TestName.text = str(testers.get_child(tester_index).name).capitalize()
+	$Previous.disabled = tester_index == 0
+	$Next.disabled = tester_index == testers.get_child_count() - 1
+
+
+func _on_decal_filter_mode_item_selected(index):
+	# Indices in the OptionButton match RenderingServer decal filtering constants.
+	RenderingServer.decals_set_filter(index)

3d/decals/textures/checker.LICENSE.md

@@ -0,0 +1,7 @@
+# License for `checker.png`
+
+Copyright (c) 2020 Kenney
+
+Licensed under CC0 1.0 Universal.
+
+Downloaded from https://kenney.nl/assets/prototype-textures

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3d/decals/textures/paint.LICENSE.md

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+# License for `paint.png` and `paint_normal.png`
+
+Copyright (c) 2010 johndn
+
+Licensed under CC BY 3.0 Unported.
+
+Downloaded from https://opengameart.org/content/splatter-pack

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3d/decals/textures/paintedarrow.LICENSE.md

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+# License for `paintedarrow.png` and `paintedarrow_normal.png`
+
+Copyright (c) 2020 Alex Foster
+
+Licensed under CC BY-SA 3.0 Unported.
+
+Downloaded from https://github.com/redeclipse/decals/blob/master/molexted/paintedarrow.png

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