init_testtest3d

8 files changed, 1357 insertions, 0 deletions

diff --git a/game/addons/zylann.hterrain/util/direct_mesh_instance.gd b/game/addons/zylann.hterrain/util/direct_mesh_instance.gd
new file mode 100644
index 0000000..17c89c9
--- /dev/null
+++ b/game/addons/zylann.hterrain/util/direct_mesh_instance.gd
@@ -0,0 +1,65 @@
+@tool
+
+# Implementation of MeshInstance which doesn't use the scene tree
+
+var _mesh_instance := RID()
+# Need to keep a reference so that the mesh RID doesn't get freed
+var _mesh : Mesh
+
+
+func _init():
+	var rs = RenderingServer
+	_mesh_instance = rs.instance_create()
+	rs.instance_set_visible(_mesh_instance, true)
+
+
+func _notification(p_what: int):
+	if p_what == NOTIFICATION_PREDELETE:
+		if _mesh_instance != RID():
+			RenderingServer.free_rid(_mesh_instance)
+			_mesh_instance = RID()
+
+
+func enter_world(world: World3D):
+	assert(_mesh_instance != RID())
+	RenderingServer.instance_set_scenario(_mesh_instance, world.get_scenario())
+
+
+func exit_world():
+	assert(_mesh_instance != RID())
+	RenderingServer.instance_set_scenario(_mesh_instance, RID())
+
+
+func set_world(world: World3D):
+	if world != null:
+		enter_world(world)
+	else:
+		exit_world()
+
+
+func set_transform(world_transform: Transform3D):
+	assert(_mesh_instance != RID())
+	RenderingServer.instance_set_transform(_mesh_instance, world_transform)
+
+
+func set_mesh(mesh: Mesh):
+	assert(_mesh_instance != RID())
+	RenderingServer.instance_set_base(_mesh_instance, mesh.get_rid() if mesh != null else RID())
+	_mesh = mesh
+
+
+func set_material(material: Material):
+	assert(_mesh_instance != RID())
+	RenderingServer.instance_geometry_set_material_override( \
+		_mesh_instance, material.get_rid() if material != null else RID())
+
+
+func set_visible(visible: bool):
+	assert(_mesh_instance != RID())
+	RenderingServer.instance_set_visible(_mesh_instance, visible)
+
+
+func set_aabb(aabb: AABB):
+	assert(_mesh_instance != RID())
+	RenderingServer.instance_set_custom_aabb(_mesh_instance, aabb)
+
diff --git a/game/addons/zylann.hterrain/util/direct_multimesh_instance.gd b/game/addons/zylann.hterrain/util/direct_multimesh_instance.gd
new file mode 100644
index 0000000..dbb899b
--- /dev/null
+++ b/game/addons/zylann.hterrain/util/direct_multimesh_instance.gd
@@ -0,0 +1,48 @@
+@tool
+
+# Implementation of MultiMeshInstance which doesn't use the scene tree
+
+var _multimesh_instance := RID()
+
+
+func _init():
+	_multimesh_instance = RenderingServer.instance_create()
+
+
+func _notification(what: int):
+	if what == NOTIFICATION_PREDELETE:
+		RenderingServer.free_rid(_multimesh_instance)
+
+
+func set_world(world: World3D):
+	RenderingServer.instance_set_scenario(
+		_multimesh_instance, world.get_scenario() if world != null else RID())
+
+
+func set_visible(visible: bool):
+	RenderingServer.instance_set_visible(_multimesh_instance, visible)
+
+
+func set_transform(trans: Transform3D):
+	RenderingServer.instance_set_transform(_multimesh_instance, trans)
+
+
+func set_multimesh(mm: MultiMesh):
+	RenderingServer.instance_set_base(_multimesh_instance, mm.get_rid() if mm != null else RID())
+
+
+func set_material_override(material: Material):
+	RenderingServer.instance_geometry_set_material_override( \
+		_multimesh_instance, material.get_rid() if material != null else RID())
+
+
+func set_aabb(aabb: AABB):
+	RenderingServer.instance_set_custom_aabb(_multimesh_instance, aabb)
+
+
+func set_layer_mask(mask: int):
+	RenderingServer.instance_set_layer_mask(_multimesh_instance, mask)
+
+
+func set_cast_shadow(cast_shadow: int):
+	RenderingServer.instance_geometry_set_cast_shadows_setting(_multimesh_instance, cast_shadow)
diff --git a/game/addons/zylann.hterrain/util/errors.gd b/game/addons/zylann.hterrain/util/errors.gd
new file mode 100644
index 0000000..c6a2c63
--- /dev/null
+++ b/game/addons/zylann.hterrain/util/errors.gd
@@ -0,0 +1,58 @@
+@tool
+
+# Taken from https://docs.godotengine.org/en/3.0/classes/class_@globalscope.html#enum-globalscope-error
+const _names = {
+	OK: "ok",
+	FAILED: "Generic error.",
+	ERR_UNAVAILABLE: "Unavailable error",
+	ERR_UNCONFIGURED: "Unconfigured error",
+	ERR_UNAUTHORIZED: "Unauthorized error",
+	ERR_PARAMETER_RANGE_ERROR: "Parameter range error",
+	ERR_OUT_OF_MEMORY: "Out of memory (OOM) error",
+	ERR_FILE_NOT_FOUND: "File Not found error",
+	ERR_FILE_BAD_DRIVE: "File Bad drive error",
+	ERR_FILE_BAD_PATH: "File Bad path error",
+	ERR_FILE_NO_PERMISSION: "File No permission error",
+	ERR_FILE_ALREADY_IN_USE: "File Already in use error",
+	ERR_FILE_CANT_OPEN: "File Can't open error",
+	ERR_FILE_CANT_WRITE: "File Can't write error",
+	ERR_FILE_CANT_READ: "File Can't read error",
+	ERR_FILE_UNRECOGNIZED: "File Unrecognized error",
+	ERR_FILE_CORRUPT: "File Corrupt error",
+	ERR_FILE_MISSING_DEPENDENCIES: "File Missing dependencies error",
+	ERR_FILE_EOF: "File End of file (EOF) error",
+	ERR_CANT_OPEN: "Can't open error",
+	ERR_CANT_CREATE: "Can't create error",
+	ERR_QUERY_FAILED: "Query failed error",
+	ERR_ALREADY_IN_USE: "Already in use error",
+	ERR_LOCKED: "Locked error",
+	ERR_TIMEOUT: "Timeout error",
+	ERR_CANT_CONNECT: "Can't connect",
+	ERR_CANT_RESOLVE: "Can't resolve",
+	ERR_CONNECTION_ERROR: "Connection error",
+	ERR_CANT_ACQUIRE_RESOURCE: "Can't acquire resource error",
+	ERR_CANT_FORK: "Can't fork",
+	ERR_INVALID_DATA: "Invalid data error",
+	ERR_INVALID_PARAMETER: "Invalid parameter error",
+	ERR_ALREADY_EXISTS: "Already exists error",
+	ERR_DOES_NOT_EXIST: "Does not exist error",
+	ERR_DATABASE_CANT_READ: "Database Read error",
+	ERR_DATABASE_CANT_WRITE: "Database Write error",
+	ERR_COMPILATION_FAILED: "Compilation failed error",
+	ERR_METHOD_NOT_FOUND: "Method not found error",
+	ERR_LINK_FAILED: "Linking failed error",
+	ERR_SCRIPT_FAILED: "Script failed error",
+	ERR_CYCLIC_LINK: "Cycling link (import cycle) error",
+	ERR_INVALID_DECLARATION: "Invalid declaration",
+	ERR_DUPLICATE_SYMBOL: "Duplicate symbol",
+	ERR_PARSE_ERROR: "Parse error",
+	ERR_BUSY: "Busy error",
+	ERR_SKIP: "Skip error",
+	ERR_HELP: "Help error",
+	ERR_BUG: "Bug error",
+	ERR_PRINTER_ON_FIRE: "The printer is on fire"
+}
+
+static func get_message(err_code: int):
+	return str("[", err_code, "]: ", _names[err_code])
+
diff --git a/game/addons/zylann.hterrain/util/grid.gd b/game/addons/zylann.hterrain/util/grid.gd
new file mode 100644
index 0000000..b28e83b
--- /dev/null
+++ b/game/addons/zylann.hterrain/util/grid.gd
@@ -0,0 +1,203 @@
+
+# Note: `tool` is optional but without it there are no error reporting in the editor
+@tool
+
+# TODO Remove grid_ prefixes, context is already given by the script itself
+
+
+# Performs a positive integer division rounded to upper (4/2 = 2, 5/3 = 2)
+static func up_div(a: int, b: int):
+	if a % b != 0:
+		return a / b + 1
+	return a / b
+
+
+# Creates a 2D array as an array of arrays.
+# if v is provided, all cells will contain the same value.
+# if v is a funcref, it will be executed to fill the grid cell per cell.
+static func create_grid(w: int, h: int, v=null):
+	var is_create_func = typeof(v) == TYPE_CALLABLE
+	var grid := []
+	grid.resize(h)
+	for y in range(grid.size()):
+		var row := []
+		row.resize(w)
+		if is_create_func:
+			for x in range(row.size()):
+				row[x] = v.call(x, y)
+		else:
+			for x in range(row.size()):
+				row[x] = v
+		grid[y] = row
+	return grid
+
+
+# Creates a 2D array that is a copy of another 2D array
+static func clone_grid(other_grid):
+	var grid := []
+	grid.resize(other_grid.size())
+	for y in range(0, grid.size()):
+		var row := []
+		var other_row = other_grid[y]
+		row.resize(other_row.size())
+		grid[y] = row
+		for x in range(0, row.size()):
+			row[x] = other_row[x]
+	return grid
+
+
+# Resizes a 2D array and allows to set or call functions for each deleted and created cells.
+# This is especially useful if cells contain objects and you don't want to loose existing data.
+static func resize_grid(grid, new_width, new_height, create_func=null, delete_func=null):
+	# Check parameters
+	assert(new_width >= 0 and new_height >= 0)
+	assert(grid != null)
+	if delete_func != null:
+		assert(typeof(delete_func) == TYPE_CALLABLE)
+	# `create_func` can also be a default value
+	var is_create_func = typeof(create_func) == TYPE_CALLABLE
+
+	# Get old size (supposed to be rectangular!)
+	var old_height = grid.size()
+	var old_width = 0
+	if grid.size() != 0:
+		old_width = grid[0].size()
+	
+	# Delete old rows
+	if new_height < old_height:
+		if delete_func != null:
+			for y in range(new_height, grid.size()):
+				var row = grid[y]
+				for x in len(row):
+					var elem = row[x]
+					delete_func.call(elem)
+		grid.resize(new_height)
+	
+	# Delete old columns
+	if new_width < old_width:
+		for y in len(grid):
+			var row = grid[y]
+			if delete_func != null:
+				for x in range(new_width, row.size()):
+					var elem = row[x]
+					delete_func.call(elem)
+			row.resize(new_width)
+	
+	# Create new columns
+	if new_width > old_width:
+		for y in len(grid):
+			var row = grid[y]
+			row.resize(new_width)
+			if is_create_func:
+				for x in range(old_width, new_width):
+					row[x] = create_func.call(x,y)
+			else:
+				for x in range(old_width, new_width):
+					row[x] = create_func
+	
+	# Create new rows
+	if new_height > old_height:
+		grid.resize(new_height)
+		for y in range(old_height, new_height):
+			var row = []
+			row.resize(new_width)
+			grid[y] = row
+			if is_create_func:
+				for x in new_width:
+					row[x] = create_func.call(x,y)
+			else:
+				for x in new_width:
+					row[x] = create_func
+	
+	# Debug test check
+	assert(grid.size() == new_height)
+	for y in len(grid):
+		assert(len(grid[y]) == new_width)
+
+
+# Retrieves the minimum and maximum values from a grid
+static func grid_min_max(grid):
+	if grid.size() == 0 or grid[0].size() == 0:
+		return [0,0]
+	var vmin = grid[0][0]
+	var vmax = vmin
+	for y in len(grid):
+		var row = grid[y]
+		for x in len(row):
+			var v = row[x]
+			if v > vmax:
+				vmax = v
+			elif v < vmin:
+				vmin = v
+	return [vmin, vmax]
+
+
+# Copies a sub-region of a grid as a new grid. No boundary check!
+static func grid_extract_area(src_grid, x0, y0, w, h):
+	var dst = create_grid(w, h)
+	for y in h:
+		var dst_row = dst[y]
+		var src_row = src_grid[y0+y]
+		for x in w:
+			dst_row[x] = src_row[x0+x]
+	return dst
+
+
+# Extracts data and crops the result if the requested rect crosses the bounds
+static func grid_extract_area_safe_crop(src_grid, x0, y0, w, h):
+	# Return empty is completely out of bounds
+	var gw = src_grid.size()
+	if gw == 0:
+		return []
+	var gh = src_grid[0].size()
+	if x0 >= gw or y0 >= gh:
+		return []
+	
+	# Crop min pos
+	if x0 < 0:
+		w += x0
+		x0 = 0
+	if y0 < 0:
+		h += y0
+		y0 = 0
+	
+	# Crop max pos
+	if x0 + w >= gw:
+		w = gw-x0
+	if y0 + h >= gh:
+		h = gh-y0
+
+	return grid_extract_area(src_grid, x0, y0, w, h)
+
+
+# Sets values from a grid inside another grid. No boundary check!
+static func grid_paste(src_grid, dst_grid, x0, y0):
+	for y in range(0, src_grid.size()):
+		var src_row = src_grid[y]
+		var dst_row = dst_grid[y0+y]
+		for x in range(0, src_row.size()):
+			dst_row[x0+x] = src_row[x]
+
+
+# Tests if two grids are the same size and contain the same values
+static func grid_equals(a, b):
+	if a.size() != b.size():
+		return false
+	for y in a.size():
+		var a_row = a[y]
+		var b_row = b[y]
+		if a_row.size() != b_row.size():
+			return false
+		for x in b_row.size():
+			if a_row[x] != b_row[x]:
+				return false
+	return true
+
+
+static func grid_get_or_default(grid, x, y, defval=null):
+	if y >= 0 and y < len(grid):
+		var row = grid[y]
+		if x >= 0 and x < len(row):
+			return row[x]
+	return defval
+
diff --git a/game/addons/zylann.hterrain/util/image_file_cache.gd b/game/addons/zylann.hterrain/util/image_file_cache.gd
new file mode 100644
index 0000000..e39e4cd
--- /dev/null
+++ b/game/addons/zylann.hterrain/util/image_file_cache.gd
@@ -0,0 +1,291 @@
+@tool
+
+# Used to store temporary images on disk.
+# This is useful for undo/redo as image edition can quickly fill up memory.
+
+# Image data is stored in archive files together,
+# because when dealing with many images it speeds up filesystem I/O on Windows.
+# If the file exceeds a predefined size, a new one is created.
+# Writing to disk is performed from a thread, to leave the main thread responsive.
+# However if you want to obtain an image back while it didn't save yet, the main thread will block.
+# When the application or plugin is closed, the files get cleared.
+
+const HT_Logger = preload("./logger.gd")
+const HT_Errors = preload("./errors.gd")
+
+const CACHE_FILE_SIZE_THRESHOLD = 1048576
+# For debugging
+const USE_THREAD = true
+
+var _cache_dir := ""
+var _next_id := 0
+var _session_id := ""
+var _cache_image_info := {}
+var _logger = HT_Logger.get_for(self)
+var _current_cache_file_index := 0
+var _cache_file_offset := 0
+
+var _saving_thread := Thread.new()
+var _save_queue := []
+var _save_queue_mutex := Mutex.new()
+var _save_semaphore := Semaphore.new()
+var _save_thread_running := false
+
+
+func _init(cache_dir: String):
+	assert(cache_dir != "")
+	_cache_dir = cache_dir
+	var rng := RandomNumberGenerator.new()
+	rng.randomize()
+	for i in 16:
+		_session_id += str(rng.randi() % 10)
+	_logger.debug(str("Image cache session ID: ", _session_id))
+	if not DirAccess.dir_exists_absolute(_cache_dir):
+		var err := DirAccess.make_dir_absolute(_cache_dir)
+		if err != OK:
+			_logger.error("Could not create directory {0}: {1}" \
+				.format([_cache_dir, HT_Errors.get_message(err)]))
+	_save_thread_running = true 
+	if USE_THREAD:
+		_saving_thread.start(_save_thread_func)
+
+
+# TODO Cannot cleanup the cache in destructor!
+# Godot doesn't allow me to call clear()...
+# https://github.com/godotengine/godot/issues/31166
+func _notification(what: int):
+	if what == NOTIFICATION_PREDELETE:
+		#clear()
+		_save_thread_running = false
+		_save_semaphore.post()
+		if USE_THREAD:
+			_saving_thread.wait_to_finish()
+
+
+func _create_new_cache_file(fpath: String):
+	var f := FileAccess.open(fpath, FileAccess.WRITE)
+	if f == null:
+		var err = FileAccess.get_open_error()
+		_logger.error("Failed to create new cache file {0}: {1}" \
+			.format([fpath, HT_Errors.get_message(err)]))
+		return
+
+
+func _get_current_cache_file_name() -> String:
+	return _cache_dir.path_join(str(_session_id, "_", _current_cache_file_index, ".cache"))
+
+
+func save_image(im: Image) -> int:
+	assert(im != null)
+	if im.has_mipmaps():
+		# TODO Add support for this? Didn't need it so far
+		_logger.error("Caching an image with mipmaps, this isn't supported")
+	
+	var fpath := _get_current_cache_file_name()
+	if _next_id == 0:
+		# First file
+		_create_new_cache_file(fpath)
+
+	var id := _next_id
+	_next_id += 1
+	
+	var item := {
+		# Duplicate the image so we are sure nothing funny will happen to it
+		# while the thread saves it
+		"image": im.duplicate(),
+		"path": fpath,
+		"data_offset": _cache_file_offset,
+		"saved": false
+	}
+	
+	_cache_file_offset += _get_image_data_size(im)
+	if _cache_file_offset >= CACHE_FILE_SIZE_THRESHOLD:
+		_cache_file_offset = 0
+		_current_cache_file_index += 1
+		_create_new_cache_file(_get_current_cache_file_name())
+
+	_cache_image_info[id] = item
+	
+	_save_queue_mutex.lock()
+	_save_queue.append(item)
+	_save_queue_mutex.unlock()
+	
+	_save_semaphore.post()
+	
+	if not USE_THREAD:
+		var before = Time.get_ticks_msec()
+		while len(_save_queue) > 0:
+			_save_thread_func()
+			if Time.get_ticks_msec() - before > 10_000:
+				_logger.error("Taking to long to empty save queue in non-threaded mode!")
+	
+	return id
+
+
+static func _get_image_data_size(im: Image) -> int:
+	return 1 + 4 + 4 + 4 + len(im.get_data())
+
+
+static func _write_image(f: FileAccess, im: Image):
+	f.store_8(im.get_format())
+	f.store_32(im.get_width())
+	f.store_32(im.get_height())
+	var data : PackedByteArray = im.get_data()
+	f.store_32(len(data))
+	f.store_buffer(data)
+
+
+static func _read_image(f: FileAccess) -> Image:
+	var format := f.get_8()
+	var width := f.get_32()
+	var height := f.get_32()
+	var data_size := f.get_32()
+	var data := f.get_buffer(data_size)
+	var im := Image.create_from_data(width, height, false, format, data)
+	return im
+
+
+func load_image(id: int) -> Image:
+	var info := _cache_image_info[id] as Dictionary
+	
+	var timeout := 5.0
+	var time_before := Time.get_ticks_msec()
+	# We could just grab `image`, because the thread only reads it.
+	# However it's still not safe to do that if we write or even lock it,
+	# so we have to assume it still has ownership of it.
+	while not info.saved:
+		OS.delay_msec(8.0)
+		_logger.debug("Waiting for cached image {0}...".format([id]))
+		if Time.get_ticks_msec() - time_before > timeout:
+			_logger.error("Could not get image {0} from cache. Something went wrong.".format([id]))
+			return null
+	
+	var fpath := info.path as String
+	
+	var f := FileAccess.open(fpath, FileAccess.READ)
+	if f == null:
+		var err := FileAccess.get_open_error()
+		_logger.error("Could not load cached image from {0}: {1}" \
+			.format([fpath, HT_Errors.get_message(err)]))
+		return null
+	
+	f.seek(info.data_offset)
+	var im = _read_image(f)
+	f = null # close file
+	
+	assert(im != null)
+	return im
+
+
+func clear():
+	_logger.debug("Clearing image cache")
+	
+	var dir := DirAccess.open(_cache_dir)
+	if dir == null:
+		#var err = DirAccess.get_open_error()
+		_logger.error("Could not open image file cache directory '{0}'" \
+			.format([_cache_dir]))
+		return
+	
+	dir.include_hidden = false
+	dir.include_navigational = false
+
+	var err := dir.list_dir_begin()
+	if err != OK:
+		_logger.error("Could not start list_dir_begin in '{0}'".format([_cache_dir]))
+		return
+	
+	# Delete all cache files
+	while true:
+		var fpath := dir.get_next()
+		if fpath == "":
+			break
+		if fpath.ends_with(".cache"):
+			_logger.debug(str("Deleting ", fpath))
+			err = dir.remove(fpath)
+			if err != OK:
+				_logger.error("Failed to delete cache file '{0}': {1}" \
+					.format([_cache_dir.path_join(fpath), HT_Errors.get_message(err)]))
+
+	_cache_image_info.clear()
+
+
+func _save_thread_func():
+	# Threads keep a reference to the object of the function they run.
+	# So if the object is a Reference, and that reference owns the thread... we get a cycle.
+	# We can break the cycle by removing 1 to the count inside the thread.
+	# The thread's reference will never die unexpectedly because we stop and destroy the thread
+	# in the destructor of the reference.
+	# If that workaround explodes one day, another way could be to use an intermediary instance
+	# extending Object, and run a function on that instead.
+	#
+	# I added this in Godot 3, and it seems to still be relevant in Godot 4 because if I don't
+	# do it, objects are leaking.
+	#
+	# BUT it seems to end up triggering a crash in debug Godot builds due to unrefing RefCounted
+	# with refcount == 0, so I guess it's wrong now?
+	# So basically, either I do it and I risk a crash,
+	# or I don't do it and then it causes a leak... 
+	# TODO Make this shit use `Object`
+	# 
+	# if USE_THREAD:
+	# 	unreference()
+
+	while _save_thread_running:
+		_save_queue_mutex.lock()
+		var to_save := _save_queue.duplicate(false)
+		_save_queue.clear()
+		_save_queue_mutex.unlock()
+
+		if len(to_save) == 0:
+			if USE_THREAD:
+				_save_semaphore.wait()
+			continue
+			
+		var f : FileAccess
+		var path := ""
+		
+		for item in to_save:
+			# Keep re-using the same file if we did not change path.
+			# It makes I/Os faster.
+			if item.path != path:
+				# Close previous file
+				f = null
+
+				path = item.path
+
+				f = FileAccess.open(path, FileAccess.READ_WRITE)
+				if f == null:
+					var err := FileAccess.get_open_error()
+					call_deferred("_on_error", "Could not open file {0}: {1}" \
+						.format([path, HT_Errors.get_message(err)]))
+					path = ""
+					continue
+			
+			f.seek(item.data_offset)
+			_write_image(f, item.image)
+			# Notify main thread.
+			# The thread does not modify data, only reads it.
+			call_deferred("_on_image_saved", item)
+		
+		# Workaround some weird behavior in Godot 4:
+		# when the next loop runs, `f` IS NOT CLEANED UP. A reference is still held before `var f`
+		# is reached, which means the file is still locked while the thread is waiting on the
+		# semaphore... so I have to explicitely "close" the file here.
+		f = null
+		
+		if not USE_THREAD:
+			break
+
+
+func _on_error(msg: String):
+	_logger.error(msg)
+
+
+func _on_image_saved(item: Dictionary):
+	_logger.debug(str("Saved ", item.path))
+	item.saved = true
+	# Should remove image from memory (for usually being last reference)
+	item.image = null
+
+
diff --git a/game/addons/zylann.hterrain/util/logger.gd b/game/addons/zylann.hterrain/util/logger.gd
new file mode 100644
index 0000000..fcc78a3
--- /dev/null
+++ b/game/addons/zylann.hterrain/util/logger.gd
@@ -0,0 +1,34 @@
+@tool
+
+class HT_LoggerBase:
+	var _context := ""
+	
+	func _init(p_context):
+		_context = p_context
+	
+	func debug(msg: String):
+		pass
+
+	func warn(msg: String):
+		push_warning("{0}: {1}".format([_context, msg]))
+	
+	func error(msg: String):
+		push_error("{0}: {1}".format([_context, msg]))
+
+
+class HT_LoggerVerbose extends HT_LoggerBase:
+	func _init(p_context: String):
+		super(p_context)
+		
+	func debug(msg: String):
+		print(_context, ": ", msg)
+
+
+static func get_for(owner: Object) -> HT_LoggerBase:
+	# Note: don't store the owner. If it's a Reference, it could create a cycle
+	var script : Script = owner.get_script()
+	var context := script.resource_path.get_file()
+	if OS.is_stdout_verbose():
+		return HT_LoggerVerbose.new(context)
+	return HT_LoggerBase.new(context)
+
diff --git a/game/addons/zylann.hterrain/util/util.gd b/game/addons/zylann.hterrain/util/util.gd
new file mode 100644
index 0000000..e2cd32c
--- /dev/null
+++ b/game/addons/zylann.hterrain/util/util.gd
@@ -0,0 +1,549 @@
+@tool
+
+const HT_Errors = preload("./errors.gd")
+
+
+# Godot has this internally but doesn't expose it
+static func next_power_of_two(x: int) -> int:
+	x -= 1
+	x |= x >> 1
+	x |= x >> 2
+	x |= x >> 4
+	x |= x >> 8
+	x |= x >> 16
+	x += 1
+	return x
+
+
+# CubeMesh doesn't have a wireframe option
+static func create_wirecube_mesh(color = Color(1,1,1)) -> Mesh:
+	var positions := PackedVector3Array([
+		Vector3(0, 0, 0),
+		Vector3(1, 0, 0),
+		Vector3(1, 0, 1),
+		Vector3(0, 0, 1),
+		Vector3(0, 1, 0),
+		Vector3(1, 1, 0),
+		Vector3(1, 1, 1),
+		Vector3(0, 1, 1),
+	])
+	var colors := PackedColorArray([
+		color, color, color, color,
+		color, color, color, color,
+	])
+	var indices := PackedInt32Array([
+		0, 1,
+		1, 2,
+		2, 3,
+		3, 0,
+
+		4, 5,
+		5, 6,
+		6, 7,
+		7, 4,
+
+		0, 4,
+		1, 5,
+		2, 6,
+		3, 7
+	])
+	var arrays := []
+	arrays.resize(Mesh.ARRAY_MAX)
+	arrays[Mesh.ARRAY_VERTEX] = positions
+	arrays[Mesh.ARRAY_COLOR] = colors
+	arrays[Mesh.ARRAY_INDEX] = indices
+	var mesh := ArrayMesh.new()
+	mesh.add_surface_from_arrays(Mesh.PRIMITIVE_LINES, arrays)
+	return mesh
+
+
+static func integer_square_root(x: int) -> int:
+	assert(typeof(x) == TYPE_INT)
+	var r := int(roundf(sqrt(x)))
+	if r * r == x:
+		return r
+	# Does not exist
+	return -1
+
+
+# Formats integer using a separator between each 3-digit group
+static func format_integer(n: int, sep := ",") -> String:
+	assert(typeof(n) == TYPE_INT)
+	
+	var negative := false
+	if n < 0:
+		negative = true
+		n = -n
+	
+	var s = ""
+	while n >= 1000:
+		s = str(sep, str(n % 1000).pad_zeros(3), s)
+		n /= 1000
+	
+	if negative:
+		return str("-", str(n), s)
+	else:
+		return str(str(n), s)
+
+
+# Goes up all parents until a node of the given class is found
+static func get_node_in_parents(node: Node, klass) -> Node:
+	while node != null:
+		node = node.get_parent()
+		if node != null and is_instance_of(node, klass):
+			return node
+	return null
+
+
+# Goes down all children until a node of the given class is found
+static func find_first_node(node: Node, klass) -> Node:
+	if is_instance_of(node, klass):
+		return node
+	for i in node.get_child_count():
+		var child := node.get_child(i)
+		var found_node := find_first_node(child, klass)
+		if found_node != null:
+			return found_node
+	return null
+
+
+static func is_in_edited_scene(node: Node) -> bool:
+	if not node.is_inside_tree():
+		return false
+	var edited_scene := node.get_tree().edited_scene_root
+	if node == edited_scene:
+		return true
+	return edited_scene != null and edited_scene.is_ancestor_of(node)
+
+
+# Get an extended or cropped version of an image,
+# with optional anchoring to decide in which direction to extend or crop.
+# New pixels are filled with the provided fill color.
+static func get_cropped_image(src: Image, width: int, height: int, 
+	fill_color=null, anchor=Vector2(-1, -1)) -> Image:
+	
+	width = int(width)
+	height = int(height)
+	if width == src.get_width() and height == src.get_height():
+		return src
+	var im := Image.create(width, height, false, src.get_format())
+	if fill_color != null:
+		im.fill(fill_color)
+	var p = get_cropped_image_params(
+		src.get_width(), src.get_height(), width, height, anchor)
+	im.blit_rect(src, p.src_rect, p.dst_pos)
+	return im
+
+
+static func get_cropped_image_params(src_w: int, src_h: int, dst_w: int, dst_h: int, 
+	anchor: Vector2) -> Dictionary:
+	
+	var rel_anchor := (anchor + Vector2(1, 1)) / 2.0
+
+	var dst_x := (dst_w - src_w) * rel_anchor.x
+	var dst_y := (dst_h - src_h) * rel_anchor.y
+	
+	var src_x := 0
+	var src_y := 0
+	
+	if dst_x < 0:
+		src_x -= dst_x
+		src_w -= dst_x
+		dst_x = 0
+	
+	if dst_y < 0:
+		src_y -= dst_y
+		src_h -= dst_y
+		dst_y = 0
+	
+	if dst_x + src_w >= dst_w:
+		src_w = dst_w - dst_x
+
+	if dst_y + src_h >= dst_h:
+		src_h = dst_h - dst_y
+
+	return {
+		"src_rect": Rect2i(src_x, src_y, src_w, src_h),
+		"dst_pos": Vector2i(dst_x, dst_y)
+	}
+
+# TODO Workaround for https://github.com/godotengine/godot/issues/24488
+# TODO Simplify in Godot 3.1 if that's still not fixed,
+# using https://github.com/godotengine/godot/pull/21806
+# And actually that function does not even work.
+#static func get_shader_param_or_default(mat: Material, name: String):
+#	assert(mat.shader != null)
+#	var v = mat.get_shader_param(name)
+#	if v != null:
+#		return v
+#	var params = VisualServer.shader_get_param_list(mat.shader)
+#	for p in params:
+#		if p.name == name:
+#			match p.type:
+#				TYPE_OBJECT:
+#					return null
+#				# I should normally check default values,
+#				# however they are not accessible
+#				TYPE_BOOL:
+#					return false
+#				TYPE_REAL:
+#					return 0.0
+#				TYPE_VECTOR2:
+#					return Vector2()
+#				TYPE_VECTOR3:
+#					return Vector3()
+#				TYPE_COLOR:
+#					return Color()
+#	return null
+
+
+# Generic way to apply editor scale to a plugin UI scene.
+# It is slower than doing it manually on specific controls.
+# Takes a node as root because since Godot 4 Window dialogs are no longer Controls.
+static func apply_dpi_scale(root: Node, dpi_scale: float):
+	if dpi_scale == 1.0:
+		return
+	var to_process := [root]
+	while len(to_process) > 0:
+		var node : Node = to_process[-1]
+		to_process.pop_back()
+		if node is Window:
+			node.size = Vector2(node.size) * dpi_scale
+		elif node is Viewport or node is SubViewport:
+			continue
+		elif node is Control:
+			if node.custom_minimum_size != Vector2(0, 0):
+				node.custom_minimum_size = node.custom_minimum_size * dpi_scale
+			var parent = node.get_parent()
+			if parent != null:
+				if not (parent is Container):
+					node.offset_bottom *= dpi_scale
+					node.offset_left *= dpi_scale
+					node.offset_top *= dpi_scale
+					node.offset_right *= dpi_scale
+		for i in node.get_child_count():
+			to_process.append(node.get_child(i))
+
+
+# TODO AABB has `intersects_segment` but doesn't provide the hit point
+# So we have to rely on a less efficient method.
+# Returns a list of intersections between an AABB and a segment, sorted
+# by distance to the beginning of the segment.
+static func get_aabb_intersection_with_segment(aabb: AABB, 
+	segment_begin: Vector3, segment_end: Vector3) -> Array:
+
+	var hits := []
+	
+	if not aabb.intersects_segment(segment_begin, segment_end):
+		return hits
+	
+	var hit
+	
+	var x_rect := Rect2(aabb.position.y, aabb.position.z, aabb.size.y, aabb.size.z)
+	
+	hit = Plane(Vector3(1, 0, 0), aabb.position.x) \
+		.intersects_segment(segment_begin, segment_end)
+	if hit != null and x_rect.has_point(Vector2(hit.y, hit.z)):
+		hits.append(hit)
+	
+	hit = Plane(Vector3(1, 0, 0), aabb.end.x) \
+		.intersects_segment(segment_begin, segment_end)
+	if hit != null and x_rect.has_point(Vector2(hit.y, hit.z)):
+		hits.append(hit)
+
+	var y_rect := Rect2(aabb.position.x, aabb.position.z, aabb.size.x, aabb.size.z)
+
+	hit = Plane(Vector3(0, 1, 0), aabb.position.y) \
+		.intersects_segment(segment_begin, segment_end)
+	if hit != null and y_rect.has_point(Vector2(hit.x, hit.z)):
+		hits.append(hit)
+	
+	hit = Plane(Vector3(0, 1, 0), aabb.end.y) \
+		.intersects_segment(segment_begin, segment_end)
+	if hit != null and y_rect.has_point(Vector2(hit.x, hit.z)):
+		hits.append(hit)
+
+	var z_rect := Rect2(aabb.position.x, aabb.position.y, aabb.size.x, aabb.size.y)
+
+	hit = Plane(Vector3(0, 0, 1), aabb.position.z) \
+		.intersects_segment(segment_begin, segment_end)
+	if hit != null and z_rect.has_point(Vector2(hit.x, hit.y)):
+		hits.append(hit)
+	
+	hit = Plane(Vector3(0, 0, 1), aabb.end.z) \
+		.intersects_segment(segment_begin, segment_end)
+	if hit != null and z_rect.has_point(Vector2(hit.x, hit.y)):
+		hits.append(hit)
+	
+	if len(hits) == 2:
+		# The segment has two hit points. Sort them by distance
+		var d0 = hits[0].distance_squared_to(segment_begin)
+		var d1 = hits[1].distance_squared_to(segment_begin)
+		if d0 > d1:
+			var temp = hits[0]
+			hits[0] = hits[1]
+			hits[1] = temp
+	else:
+		assert(len(hits) < 2)
+	
+	return hits
+
+
+class HT_GridRaytraceResult2D:
+	var hit_cell_pos: Vector2
+	var prev_cell_pos: Vector2
+
+
+# Iterates through a virtual 2D grid of unit-sized square cells,
+# and executes an action on each cell intersecting the given segment,
+# ordered from begin to end.
+# One of my most re-used pieces of code :)
+#
+# Initially inspired by http://www.cse.yorku.ca/~amana/research/grid.pdf
+#
+# Ported from https://github.com/bulletphysics/bullet3/blob/
+# 687780af6b491056700cfb22cab57e61aeec6ab8/src/BulletCollision/CollisionShapes/
+# btHeightfieldTerrainShape.cpp#L418
+#
+static func grid_raytrace_2d(ray_origin: Vector2, ray_direction: Vector2, 
+	quad_predicate: Callable, max_distance: float) -> HT_GridRaytraceResult2D:
+	
+	if max_distance < 0.0001:
+		# Consider the ray is too small to hit anything
+		return null
+	
+	var xi_step := 0
+	if ray_direction.x > 0:
+		xi_step = 1
+	elif ray_direction.x < 0:
+		xi_step = -1
+
+	var yi_step := 0
+	if ray_direction.y > 0:
+		yi_step = 1
+	elif ray_direction.y < 0:
+		yi_step = -1
+	
+	var infinite := 9999999.0
+
+	var param_delta_x := infinite
+	if xi_step != 0:
+		param_delta_x = 1.0 / absf(ray_direction.x)
+
+	var param_delta_y := infinite
+	if yi_step != 0:
+		param_delta_y = 1.0 / absf(ray_direction.y)
+
+	# pos = param * dir
+	# At which value of `param` we will cross a x-axis lane?
+	var param_cross_x := infinite 
+	# At which value of `param` we will cross a y-axis lane?
+	var param_cross_y := infinite
+
+	# param_cross_x and param_cross_z are initialized as being the first cross
+	# X initialization
+	if xi_step != 0:
+		if xi_step == 1:
+			param_cross_x = (ceilf(ray_origin.x) - ray_origin.x) * param_delta_x
+		else:
+			param_cross_x = (ray_origin.x - floorf(ray_origin.x)) * param_delta_x
+	else:
+		# Will never cross on X
+		param_cross_x = infinite
+
+	# Y initialization
+	if yi_step != 0:
+		if yi_step == 1:
+			param_cross_y = (ceilf(ray_origin.y) - ray_origin.y) * param_delta_y
+		else:
+			param_cross_y = (ray_origin.y - floorf(ray_origin.y)) * param_delta_y
+	else:
+		# Will never cross on Y
+		param_cross_y = infinite
+
+	var x := int(floorf(ray_origin.x))
+	var y := int(floorf(ray_origin.y))
+
+	# Workaround cases where the ray starts at an integer position
+	if param_cross_x == 0.0:
+		param_cross_x += param_delta_x
+		# If going backwards, we should ignore the position we would get by the above flooring,
+		# because the ray is not heading in that direction
+		if xi_step == -1:
+			x -= 1
+
+	if param_cross_y == 0.0:
+		param_cross_y += param_delta_y
+		if yi_step == -1:
+			y -= 1
+	
+	var prev_x := x
+	var prev_y := y
+	var param := 0.0
+	var prev_param := 0.0
+
+	while true:
+		prev_x = x
+		prev_y = y
+		prev_param = param
+
+		if param_cross_x < param_cross_y:
+			# X lane
+			x += xi_step
+			# Assign before advancing the param,
+			# to be in sync with the initialization step
+			param = param_cross_x
+			param_cross_x += param_delta_x
+			
+		else:
+			# Y lane
+			y += yi_step
+			param = param_cross_y
+			param_cross_y += param_delta_y
+
+		if param > max_distance:
+			param = max_distance
+			# quad coordinates, enter param, exit/end param
+			if quad_predicate.call(prev_x, prev_y, prev_param, param):
+				var res := HT_GridRaytraceResult2D.new()
+				res.hit_cell_pos = Vector2(x, y)
+				res.prev_cell_pos = Vector2(prev_x, prev_y)
+				return res
+			else:
+				break
+			
+		elif quad_predicate.call(prev_x, prev_y, prev_param, param):
+			var res := HT_GridRaytraceResult2D.new()
+			res.hit_cell_pos = Vector2(x, y)
+			res.prev_cell_pos = Vector2(prev_x, prev_y)
+			return res
+	
+	return null
+
+
+static func get_segment_clipped_by_rect(rect: Rect2, 
+	segment_begin: Vector2, segment_end: Vector2) -> Array:
+	
+	#         /
+	#  A-----/---B        A-----+---B
+	#  |    /    |   =>   |    /    |
+	#  |   /     |        |   /     |
+	#  C--/------D        C--+------D
+	#    /
+	
+	if rect.has_point(segment_begin) and rect.has_point(segment_end):
+		return [segment_begin, segment_end]
+	
+	var a := rect.position
+	var b := Vector2(rect.end.x, rect.position.y)
+	var c := Vector2(rect.position.x, rect.end.y)
+	var d := rect.end
+	
+	var ab = Geometry2D.segment_intersects_segment(segment_begin, segment_end, a, b)
+	var cd = Geometry2D.segment_intersects_segment(segment_begin, segment_end, c, d)
+	var ac = Geometry2D.segment_intersects_segment(segment_begin, segment_end, a, c)
+	var bd = Geometry2D.segment_intersects_segment(segment_begin, segment_end, b, d)
+	
+	var hits = []
+	if ab != null:
+		hits.append(ab)
+	if cd != null:
+		hits.append(cd)
+	if ac != null:
+		hits.append(ac)
+	if bd != null:
+		hits.append(bd)
+
+	# Now we need to order the hits from begin to end
+	if len(hits) == 1:
+		if rect.has_point(segment_begin):
+			hits = [segment_begin, hits[0]]
+		elif rect.has_point(segment_end):
+			hits = [hits[0], segment_end]
+		else:
+			# TODO This has a tendency to happen with integer coordinates...
+			# How can you get only 1 hit and have no end of the segment
+			# inside of the rectangle? Float precision shit? Assume no hit...
+			return []
+			
+	elif len(hits) == 2:
+		var d0 = hits[0].distance_squared_to(segment_begin)
+		var d1 = hits[1].distance_squared_to(segment_begin)
+		if d0 > d1:
+			hits = [hits[1], hits[0]]
+
+	return hits	
+
+
+static func get_pixel_clamped(im: Image, x: int, y: int) -> Color:
+	x = clampi(x, 0, im.get_width() - 1)
+	y = clampi(y, 0, im.get_height() - 1)
+	return im.get_pixel(x, y)
+
+
+static func update_configuration_warning(node: Node, recursive: bool):
+	if not Engine.is_editor_hint():
+		return
+	node.update_configuration_warnings()
+	if recursive:
+		for i in node.get_child_count():
+			var child = node.get_child(i)
+			update_configuration_warning(child, true)
+
+
+static func write_import_file(settings: Dictionary, imp_fpath: String, logger) -> bool:
+	# TODO Should use ConfigFile instead
+	var f := FileAccess.open(imp_fpath, FileAccess.WRITE)
+	if f == null:
+		var err = FileAccess.get_open_error()
+		logger.error("Could not open '{0}' for write, error {1}" \
+			.format([imp_fpath, HT_Errors.get_message(err)]))
+		return false
+
+	for section in settings:
+		f.store_line(str("[", section, "]"))
+		f.store_line("")
+		var params = settings[section]
+		for key in params:
+			var v = params[key]
+			var sv
+			match typeof(v):
+				TYPE_STRING:
+					sv = str('"', v.replace('"', '\"'), '"')
+				TYPE_BOOL:
+					sv = "true" if v else "false"
+				_:
+					sv = str(v)
+			f.store_line(str(key, "=", sv))
+		f.store_line("")
+
+	return true
+
+
+static func update_texture_partial(
+	tex: ImageTexture, im: Image, src_rect: Rect2i, dst_pos: Vector2i):
+	
+	#               ..ooo@@@XXX%%%xx..
+	#            .oo@@XXX%x%xxx..     ` .
+	#          .o@XX%%xx..               ` .
+	#        o@X%..                  ..ooooooo
+	#      .@X%x.                 ..o@@^^   ^^@@o
+	#    .ooo@@@@@@ooo..      ..o@@^          @X%
+	#    o@@^^^     ^^^@@@ooo.oo@@^             %
+	#   xzI    -*--      ^^^o^^        --*-     %
+	#   @@@o     ooooooo^@@^o^@X^@oooooo     .X%x
+	#  I@@@@@@@@@XX%%xx  ( o@o )X%x@ROMBASED@@@X%x
+	#  I@@@@XX%%xx  oo@@@@X% @@X%x   ^^^@@@@@@@X%x
+	#   @X%xx     o@@@@@@@X% @@XX%%x  )    ^^@X%x
+	#    ^   xx o@@@@@@@@Xx  ^ @XX%%x    xxx
+	#          o@@^^^ooo I^^ I^o ooo   .  x
+	#          oo @^ IX      I   ^X  @^ oo
+	#          IX     U  .        V     IX
+	#           V     .           .     V
+	#
+
+	# TODO Optimize: Godot 4 has lost the ability to update textures partially!
+	var fuck = tex.get_image()
+	fuck.blit_rect(im, src_rect, dst_pos)
+	tex.update(fuck)
+
diff --git a/game/addons/zylann.hterrain/util/xyz_format.gd b/game/addons/zylann.hterrain/util/xyz_format.gd
new file mode 100644
index 0000000..86e4a1a
--- /dev/null
+++ b/game/addons/zylann.hterrain/util/xyz_format.gd
@@ -0,0 +1,109 @@
+@tool
+
+# XYZ files are text files containing a list of 3D points.
+# They can be found in GIS software as an export format for heightmaps.
+# In order to turn it into a heightmap we may calculate bounds first
+# to find the origin and then set points in an image.
+
+
+class HT_XYZBounds:
+	# Note: it is important for these to be double-precision floats,
+	# GIS data can have large coordinates
+	var min_x := 0.0
+	var min_y := 0.0
+
+	var max_x := 0.0
+	var max_y := 0.0
+
+	var line_count := 0
+
+	var image_width := 0
+	var image_height := 0
+
+
+# TODO `split_float` returns 32-bit floats, despite internally parsing doubles... 
+# Despite that, I still use it here because it doesn't seem to cause issues and is faster.
+# If it becomes an issue, we'll have to switch to `split` and casting to `float`.
+
+static func load_bounds(f: FileAccess) -> HT_XYZBounds:
+	# It is faster to get line and split floats than using CSV functions
+	var line := f.get_line()
+	var floats := line.split_floats(" ")
+	
+	# We only care about X and Y, it makes less operations to do in the loop.
+	# Z is the height and will remain as-is at the end.
+	var min_pos_x := floats[0]
+	var min_pos_y := floats[1]
+
+	var max_pos_x := min_pos_x
+	var max_pos_y := min_pos_y
+
+	# Start at 1 because we just read the first line
+	var line_count := 1
+	
+	# We know the file is a series of float triplets
+	while not f.eof_reached():
+		line = f.get_line()
+
+		# The last line can be empty
+		if len(line) < 2:
+			break
+
+		floats = line.split_floats(" ")
+
+		var pos_x := floats[0]
+		var pos_y := floats[1]
+		
+		min_pos_x = minf(min_pos_x, pos_x)
+		min_pos_y = minf(min_pos_y, pos_y)
+
+		max_pos_x = maxf(max_pos_x, pos_x)
+		max_pos_y = maxf(max_pos_y, pos_y)
+
+		line_count += 1
+
+	var bounds := HT_XYZBounds.new()
+	bounds.min_x = min_pos_x
+	bounds.min_y = min_pos_y
+	bounds.max_x = max_pos_x
+	bounds.max_y = max_pos_y
+	bounds.line_count = line_count
+	bounds.image_width = int(max_pos_x - min_pos_x) + 1
+	bounds.image_height = int(max_pos_y - min_pos_y) + 1
+	return bounds
+
+
+# Loads points into an image with existing dimensions and format.
+# `f` must be positioned at the beginning of the series of points.
+# If `bounds` is `null`, it will be computed.
+static func load_heightmap(f: FileAccess, dst_image: Image, bounds: HT_XYZBounds):
+	# We are not going to read the entire file directly in memory, because it can be really big.
+	# Instead we'll parse it directly and the only thing we retain in memory is the heightmap.
+	# This can be really slow on big files. If we can assume the file is square and points
+	# separated by 1 unit each in a grid pattern, it could be a bit faster, but
+	# parsing points from text really is the main bottleneck (40 seconds to load a 2000x2000 file!).
+	
+	# Bounds can be precalculated
+	if bounds == null:
+		var file_begin := f.get_position()
+		bounds = load_bounds(f)
+		f.seek(file_begin)
+	
+	# Put min coordinates on the GDScript stack so they are faster to access
+	var min_pos_x := bounds.min_x
+	var min_pos_y := bounds.min_y
+	var line_count := bounds.line_count
+
+	for i in line_count:
+		var line := f.get_line()
+		var floats := line.split_floats(" ")
+		var x := int(floats[0] - min_pos_x)
+		var y := int(floats[1] - min_pos_y)
+		
+		# Make sure the coordinate is inside the image,
+		# due to float imprecision or potentially non-grid-aligned points.
+		# Could use `Rect2` to check faster but it uses floats.
+		# `Rect2i` would be better but is only available in Godot 4.
+		if x >= 0 and y >= 0 and x < dst_image.get_width() and y < dst_image.get_height():
+			dst_image.set_pixel(x, y, Color(floats[2], 0, 0))
+