extends SceneTree
const Materials = preload("res://fx/particle_color_material.gd")
const EffectPlayer = preload("res://fx/effect_player.gd")
var failures := 0
func check(ok: bool, label: String) -> void:
	if not ok:
		failures += 1
		printerr("FAIL: " + label)
func _init() -> void:
	call_deferred("run")
func run() -> void:
	var fx := EffectPlayer.new()
	var textures: Array[Texture2D] = []
	for color in [Color.RED, Color.GREEN, Color.BLUE]:
		var img := Image.create(4, 4, false, Image.FORMAT_RGBA8)
		img.fill(color)
		textures.append(ImageTexture.create_from_image(img))
	var frames := fx._texture_array(textures)
	check(frames != null and frames.get_layers() == 3, "independent texture-array slices")
	var base := StandardMaterial3D.new()
	base.blend_mode = BaseMaterial3D.BLEND_MODE_MIX
	base.albedo_texture = textures[0]
	var mat := Materials.build(base, 4, frames, {"TexAniType": 1, "TexAniDelay": 0.1}, 1.0)
	check(mat is ShaderMaterial, "ordinary modulation supports per-particle frames")
	if DisplayServer.get_name() != "headless":
		await pixels(mat)
	else:
		print("SKIP: texture animation pixels require a renderer")
	fx.free()
	print("effect_texture_animation_test: failures=%d" % failures)
	quit(1 if failures else 0)
func pixels(material: ShaderMaterial) -> void:
	var viewport := SubViewport.new()
	viewport.size = Vector2i(96, 96)
	viewport.own_world_3d = true
	viewport.render_target_update_mode = SubViewport.UPDATE_ALWAYS
	root.add_child(viewport)
	var environment := WorldEnvironment.new()
	environment.environment = Environment.new()
	environment.environment.background_mode = Environment.BG_COLOR
	environment.environment.background_color = Color.BLACK
	viewport.add_child(environment)
	var camera := Camera3D.new()
	camera.projection = Camera3D.PROJECTION_ORTHOGONAL
	camera.size = 3.0
	camera.position.z = 3.0
	viewport.add_child(camera)
	var instance := MultiMeshInstance3D.new()
	var mesh := QuadMesh.new()
	mesh.size = Vector2(0.8, 0.8)
	var multi := MultiMesh.new()
	multi.transform_format = MultiMesh.TRANSFORM_3D
	multi.use_custom_data = true
	multi.use_colors = true
	multi.mesh = mesh
	multi.instance_count = 2
	for i in 2:
		multi.set_instance_transform(i, Transform3D(Basis.IDENTITY, Vector3(-0.6 + i * 1.2, 0, 0)))
		multi.set_instance_color(i, Color.WHITE)
	instance.multimesh = multi
	instance.material_override = material
	viewport.add_child(instance)
	# Same material, different ages: old shared AnimatedTexture fails this.
	for type in [0, 1, 2, 3, 4]:
		material.set_shader_parameter("animation_type", type)
		for age in [0.15, 0.25, 0.35]:
			multi.set_instance_custom_data(0, Color(0, 0, 0.2, 0))
			multi.set_instance_custom_data(1, Color(0, age, 0.2, 0))
			await process_frame
			await RenderingServer.frame_post_draw
			var img := viewport.get_texture().get_image()
			var newborn := img.get_pixel(29, 48)
			check(newborn.r > 0.9 and newborn.g < 0.05, "newborn always starts at frame zero type=%d" % type)
			var aged := img.get_pixel(67, 48)
			if type in [0, 1, 2, 4]:
				var step := int(floor(age / 0.1))
				var index := 0 if type == 0 else posmod(-step if type == 2 else step, 3)
				var channels := [aged.r, aged.g, aged.b]
				check(channels[index] > 0.9, "age selects expected frame type=%d age=%s" % [type, age])
			else:
				check(maxf(aged.r, maxf(aged.g, aged.b)) > 0.9, "random frame selects one valid texture")
	viewport.free()
	await process_frame