# This file is part of sunder.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.
extends OptionButton

func _ready() -> void:
	select(Settings.get_value("video", "vsync"))

func _on_item_selected(index : int) -> void:
	Settings.set_value("video", "vsync", index)
	# Vsync is enabled by default.
	# Vertical synchronization locks framerate and makes screen tearing not visible at the cost of
	# higher input latency and stuttering when the framerate target is not met.
	# Adaptive V-Sync automatically disables V-Sync when the framerate target is not met, and enables
	# V-Sync otherwise. This prevents suttering and reduces input latency when the framerate target
	# is not met, at the cost of visible tearing.
	if index == 0: # Disabled (default)
		DisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_DISABLED)
	elif index == 1: # Adaptive
		DisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_ADAPTIVE)
	elif index == 2: # Enabled
		DisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_ENABLED)