add passthrough node (#116)

closes #85

Reviewed-on: https://codeberg.org/StreamGraph/StreamGraph/pulls/116
Co-authored-by: Lera Elvoé <yagich@poto.cafe>
Co-committed-by: Lera Elvoé <yagich@poto.cafe>

classes/deck/nodes/general/passthrough.gd

@@ -0,0 +1,36 @@
+# (c) 2023-present Eroax
+# (c) 2023-present Yagich
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+extends DeckNode
+
+
+func _init() -> void:
+	name = "Passthrough"
+	node_type = name.to_snake_case()
+	description = "Receives a trigger input and passes it along, overwriting the data with the value from the second input."
+	
+	add_input_port(
+		DeckType.Types.ANY,
+		"Trigger",
+		"",
+		Port.UsageType.TRIGGER,
+	)
+	
+	add_input_port(
+		DeckType.Types.ANY,
+		"Data",
+		"field",
+		Port.UsageType.VALUE_REQUEST,
+	)
+	
+	add_output_port(
+		DeckType.Types.ANY,
+		"Output",
+		"",
+		Port.UsageType.TRIGGER,
+	)
+
+
+func _receive(_to_input_port: int, _data: Variant) -> void:
+	var data = await resolve_input_port_value_async(1)
+	send(0, data)