Added a process group demo.

process_groups/multi_threaded/Main.gd

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+extends Node
+
+
+# Declare member variables here. Examples:
+# var a: int = 2
+# var b: String = "text"
+
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	print("")
+	print("")
+	print("When running this demo what you need to see is that ")
+	print("between every frame steps you see 3 _process() calls, and 3 _process_group_process() start,")
+	print("and 3 _process_group_process() end calls printed to the console.")
+	print("This means that the ProcessGroups works properly.")
+	print("_process() methods will run in the main thread, and ProcessGroup calls it's ")
+	print("children's _process_group_process() in it's own thread, and ProcessGroup2 also calls it's ")
+	print("children's _process_group_process() in it's own thread,")
+	print("and SceneTree waits for them to finish before going to the next step.")
+	print("This allows multi threaded processing similar to Godot 4s,")
+	print("howewer this implementation tries t make it as explicit as possible when you are working in a thread or not.")
+	print("")
+	print("")
+	
+	get_tree().connect("idle_frame", self, "idle_frame")
+
+
+func idle_frame():
+	print("==============  NEW FRAME START  ==============")

process_groups/multi_threaded/Main.tscn

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+[gd_scene load_steps=3 format=2]
+
+[ext_resource path="res://Main.gd" type="Script" id=1]
+[ext_resource path="res://ProcessorNode.gd" type="Script" id=2]
+
+[node name="Main" type="Node"]
+script = ExtResource( 1 )
+
+[node name="ProcessGroup" type="ProcessGroup" parent="."]
+
+[node name="ProcessorNode" type="Node" parent="ProcessGroup"]
+script = ExtResource( 2 )
+
+[node name="ProcessorNode2" type="Node" parent="ProcessGroup"]
+script = ExtResource( 2 )
+
+[node name="ProcessGroup2" type="ProcessGroup" parent="."]
+
+[node name="ProcessorNode4" type="Node" parent="ProcessGroup2"]
+script = ExtResource( 2 )

process_groups/multi_threaded/ProcessorNode.gd

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+extends Node
+
+
+# Declare member variables here. Examples:
+# var a: int = 2
+# var b: String = "text"
+
+
+# Called when the node enters the scene tree for the first time.
+#func _ready() -> void:
+#	set_process_group_process(false)
+#	set_process_group_process(true)
+
+func _process_group_process(delta: float) -> void:
+	print(str(get_path()) + " _process_group_process() start")
+	OS.delay_msec(1000)
+	print(str(get_path()) + " _process_group_process() fin")
+	
+	
+func _process(delta: float) -> void:
+	print(str(get_path()) + " _process()")
+
+#func _notification(what: int) -> void:
+#	#print(what)
+#	if what >= 60 && what <= 70:
+#		print(what)

process_groups/multi_threaded/default_env.tres

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+[gd_resource type="Environment3D" load_steps=2 format=2]
+
+[sub_resource type="ProceduralSky" id=1]
+
+[resource]
+background_mode = 2
+background_sky = SubResource( 1 )

process_groups/multi_threaded/icon.png.import

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+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/icon.png-487276ed1e3a0c39cad0279d744ee560.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://icon.png"
+dest_files=[ "res://.import/icon.png-487276ed1e3a0c39cad0279d744ee560.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+process/normal_map_invert_y=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0

process_groups/multi_threaded/project.pandemonium

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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=4
+
+[application]
+
+config/name="Multi Threaded"
+run/main_scene="res://Main.tscn"
+config/icon="res://icon.png"
+
+[physics]
+
+common/enable_pause_aware_picking=true
+
+[rendering]
+
+vram_compression/import_etc=true
+vram_compression/import_etc2=false
+environment/default_environment="res://default_env.tres"