Implement playable Mac client and rendering validation

project/particle_exit_test.gd

@@ -0,0 +1,39 @@
+# Export-template reproducer: no maps, models, assets or network required.
+extends Node
+var held: Array[ParticleProcessMaterial] = []
+func _ready() -> void:
+	call_deferred("run")
+func run() -> void:
+	var mode := OS.get_environment("MT_PARTICLE_EXIT_CASE")
+	for i in 8:
+		make_particle(mode, i)
+	for i in 5: await get_tree().process_frame
+	held.clear()
+	for i in 5: await get_tree().process_frame
+	print("PARTICLE_EXIT PASS case=", mode)
+	get_tree().quit()
+func make_particle(mode: String, index: int) -> void:
+	if mode == "empty": return
+	var material := ParticleProcessMaterial.new()
+	if mode in ["gravity", "scale", "shape", "held", "restored"]:
+		if mode == "gravity": material.gravity = Vector3(0, -1, 0)
+		if mode == "scale": material.scale_min = 0.5
+		if mode in ["shape", "held", "restored"]: material.emission_shape = index % 3
+		material.get_rid()
+		if mode == "restored":
+			material.emission_shape = ParticleProcessMaterial.EMISSION_SHAPE_POINT
+			material.get_rid()
+		if mode == "held": held.append(material)
+		return
+	if mode == "primed": material.get_rid()
+	if mode != "default":
+		material.gravity = Vector3(0, -1, 0)
+		material.emission_shape = index % 3
+		material.scale_min = 0.5
+	material.get_rid()
+	if mode == "emitter":
+		var emitter := GPUParticles3D.new()
+		emitter.emitting = false
+		emitter.process_material = material
+		add_child(emitter)
+		emitter.free()