extends SceneTree
## Render-Probe (Karte 25.10., Sly: „immer noch harte Kanten beim Malen“):
## 256-m-Karte (feines Raster 257 = 1 m), Sandpfad mit 2-m-Pinsel, top-down
## auf 40 m Ausschnitt. Misst die größte Helligkeits-Stufe zwischen
## Nachbarpixeln quer zur Kante — weich = kleine Stufen über mehrere Pixel.
## Start (BRAUCHT Rendering): godot --path . --rendering-driver opengl3 -s res://tests/probe_mal_weich_render.gd -- <out.png>

func _initialize() -> void:
	_run()


func _run() -> void:
	await process_frame
	await process_frame
	var out := OS.get_cmdline_user_args()[0] if OS.get_cmdline_user_args().size() > 0 else "/tmp/mal_weich.png"
	var size := float(OS.get_environment("PROBE_SIZE")) if OS.get_environment("PROBE_SIZE") != "" else 256.0
	var res := 129
	var mres := SvmapIO.material_resolution_for(res, size, size)
	var heights := PackedFloat32Array()
	heights.resize(res * res)
	var mats := PackedByteArray()
	mats.resize(mres * mres)
	var mb := PackedByteArray()
	mb.resize(mres * mres)
	var mw := PackedByteArray()
	mw.resize(mres * mres)
	var weich := float(OS.get_environment("PROBE_WEICH")) if OS.get_environment("PROBE_WEICH") != "" else 0.0
	var radius := float(OS.get_environment("PROBE_R")) if OS.get_environment("PROBE_R") != "" else 2.0
	for i in 60:   # schräger Pfad + Kurve
		var t := float(i) / 59.0
		TerrainField.apply_material_brush_mix(mats, mb, mw, mres, size, size,
				-15.0 + 30.0 * t, -10.0 + 8.0 * sin(t * 3.0), radius, 1, weich)
	var view := Node3D.new()
	view.set_script(load("res://src/viewport/terrain_mesh.gd"))
	root.add_child(view)
	view.call("set_mix", mb, mw)
	view.call("update_heights", heights, res, size, size, mats)
	view.call("set_contours", false)
	var cam := Camera3D.new()
	root.add_child(cam)
	cam.projection = Camera3D.PROJECTION_ORTHOGONAL
	cam.size = 40.0
	cam.position = Vector3(0.0, 50.0, -5.0 + 0.01)
	cam.look_at(Vector3(0, 0, -5.0), Vector3(0, 0, -1))
	cam.current = true
	for i in 4:
		await process_frame
	await RenderingServer.frame_post_draw
	var img := root.get_texture().get_image()
	img.save_png(out)
	# Größte Nachbarpixel-Stufe (Luminanz) im Bild — harte Pixelkanten ≈ volle
	# Sand↔Gras-Differenz in EINEM Pixel, weich = über ~Pixel/Meter verteilt.
	var maxstep := 0.0
	for y in range(0, img.get_height(), 2):
		for x in range(1, img.get_width()):
			var a := img.get_pixel(x - 1, y).get_luminance()
			var b := img.get_pixel(x, y).get_luminance()
			maxstep = maxf(maxstep, absf(a - b))
	print("PROBE_MAXSTEP %.4f mres=%d px/m=%.1f -> %s" % [maxstep, mres, float(img.get_width()) / 40.0, out])
	quit(0)