Platformer 2.0

.editorconfig

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+root = true
+
+[*]
+charset = utf-8

.gitattributes

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+# Normalize EOL for all files that Git considers text files.
+* text=auto eol=lf

.gitignore

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+# Godot 4+ specific ignores
+.godot/
+/android/

common/state.gd

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+extends Resource
+class_name State
+
+@export var id: StringName
+
+func enter(_data: Object) -> void:
+	pass
+
+func exit(_data: Object) -> void:
+	pass
+
+func process(_data: Object, _delta: float) -> void:
+	pass

common/state.gd.uid

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+uid://b2htg6oquvdho

common/state_machine.gd

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+extends RefCounted
+class_name StateMachine
+
+const MIN_PRIORITY = -2147483648
+
+signal state_changed(f_id: StringName, t_id: StringName)
+
+var states: Dictionary[StringName, State] = {}
+var transitions: Array[StateTransition] = []
+var current_state: State
+
+var _pending_id: StringName = &""
+var _pending_priority = MIN_PRIORITY
+
+func setup(state_list: Array[State], transition_list: Array[StateTransition], initial_id: StringName) -> void:
+	states.clear()
+	for s in state_list:
+		if s != null:
+			states[s.id] = s
+	
+	transitions = transition_list
+
+	current_state = states.get(initial_id)
+	if current_state == null and not states.is_empty():
+		current_state = states.values()[0]
+		push_warning("State machine initial state '%s' not found, falling back to '%s'" % [initial_id, current_state.id])
+
+func process(data: Object, delta: float) -> void:
+	if current_state == null:
+		return
+
+	current_state.process(data, delta)
+	_evaluate_transitions(data)
+
+# Escape hatch for an immediate transition
+func request_transition(to_id: StringName, priority: int = 999) -> void:
+	if priority >= _pending_priority:
+		_pending_id = to_id
+		_pending_priority = priority
+
+func _evaluate_transitions(data: Object) -> void:
+	var best_id: StringName = &""
+	var best_priority: int = MIN_PRIORITY
+
+	# Is there a next state pending that isn't our current state?
+	if _pending_id != &"" and _pending_id != current_state.id and states.has(_pending_id):
+		best_id = _pending_id
+		best_priority = _pending_priority
+	
+	for t in transitions:
+		# Skip the current state
+		if not t.matches_current(current_state.id) or t.to == current_state.id:
+			continue
+		if not states.has(t.to):
+			push_warning("StateMachine: transition targets unknown state '%s'" % t.to)
+			continue
+		if t.priority < best_priority:
+			continue
+		if t.is_satisfied(data):
+			best_id = t.to
+			best_priority = t.priority
+	
+	_pending_id = &""
+	_pending_priority = MIN_PRIORITY
+
+	if best_id != &"" and best_id != current_state.id:
+		var from_id = current_state.id
+		current_state.exit(data)
+		current_state = states[best_id]
+		current_state.enter(data)
+		state_changed.emit(from_id, current_state.id)

common/state_machine.gd.uid

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+uid://cp2okhs1ekwad

common/state_transition.gd

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+extends Resource
+class_name StateTransition
+
+const ANY_STATE: StringName = &"*"
+
+@export var from: StringName = ANY_STATE
+@export var to: StringName
+@export var priority: int = 0
+@export var condition: TransitionCondition
+
+func matches_current(current_id: StringName) -> bool:
+	return from == ANY_STATE or from == current_id
+
+func is_satisfied(data: Object) -> bool:
+	return condition == null or condition.evaluate(data)

common/state_transition.gd.uid

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+uid://e2c8iukkr01l

common/transition_condition.gd

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+extends Resource
+class_name TransitionCondition
+
+var _callable: Callable
+
+func _init(callable: Callable = Callable()) -> void:
+	_callable = callable
+
+
+func evaluate(data: Object) -> bool:
+	if _callable.is_valid():
+		var result = _callable.call(data)
+		if result is bool: 
+			return result
+		else:
+			push_warning("Transition callable did not return boolean! Returning false.")
+			return false
+	return true

common/transition_condition.gd.uid

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+uid://bi3vhketkwgp6

icon.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="128" height="128"><rect width="124" height="124" x="2" y="2" fill="#363d52" stroke="#212532" stroke-width="4" rx="14"/><g fill="#fff" transform="translate(12.322 12.322)scale(.101)"><path d="M105 673v33q407 354 814 0v-33z"/><path fill="#478cbf" d="m105 673 152 14q12 1 15 14l4 67 132 10 8-61q2-11 15-15h162q13 4 15 15l8 61 132-10 4-67q3-13 15-14l152-14V427q30-39 56-81-35-59-83-108-43 20-82 47-40-37-88-64 7-51 8-102-59-28-123-42-26 43-46 89-49-7-98 0-20-46-46-89-64 14-123 42 1 51 8 102-48 27-88 64-39-27-82-47-48 49-83 108 26 42 56 81zm0 33v39c0 276 813 276 814 0v-39l-134 12-5 69q-2 10-14 13l-162 11q-12 0-16-11l-10-65H446l-10 65q-4 11-16 11l-162-11q-12-3-14-13l-5-69z"/><path d="M483 600c0 34 58 34 58 0v-86c0-34-58-34-58 0z"/><circle cx="725" cy="526" r="90"/><circle cx="299" cy="526" r="90"/></g><g fill="#414042" transform="translate(12.322 12.322)scale(.101)"><circle cx="307" cy="532" r="60"/><circle cx="717" cy="532" r="60"/></g></svg>

icon.svg.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://qmbdc8qsq5x3"
+path="res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://icon.svg"
+dest_files=["res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1
+svg/scale=1.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false

main_menu.tscn

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+[gd_scene format=3 uid="uid://6xemlk773ni5"]
+
+[ext_resource type="Script" uid="uid://bcipombqbxffa" path="res://player/player_controller.gd" id="1_06t4h"]
+
+[sub_resource type="CapsuleShape2D" id="CapsuleShape2D_lbwmp"]
+
+[sub_resource type="WorldBoundaryShape2D" id="WorldBoundaryShape2D_lbwmp"]
+
+[node name="Node2D" type="Node2D" unique_id=38411652]
+
+[node name="CharacterBody2D" type="CharacterBody2D" parent="." unique_id=1863609037]
+position = Vector2(499, 159)
+script = ExtResource("1_06t4h")
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="CharacterBody2D" unique_id=1734081974]
+shape = SubResource("CapsuleShape2D_lbwmp")
+
+[node name="AnimationPlayer" type="AnimationPlayer" parent="CharacterBody2D" unique_id=356868445]
+
+[node name="StaticBody2D" type="StaticBody2D" parent="." unique_id=1508606128]
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="StaticBody2D" unique_id=889471660]
+position = Vector2(0, 576)
+shape = SubResource("WorldBoundaryShape2D_lbwmp")

player/player_controller.gd

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+extends CharacterBody2D
+
+@export var gravity = 900.0
+
+var movement_fsm: StateMachine
+@onready var animation_player: AnimationPlayer = $AnimationPlayer
+
+var FSMSetup = preload("res://player/setup_state.gd")
+var movement_states: Array[State] = []
+var movement_transitions: Array[StateTransition] = []
+var movement_init_state: StringName = &"idle"
+
+func _ready() -> void:
+	movement_states = FSMSetup.build_states()
+	movement_transitions = FSMSetup.build_transitions()
+
+	movement_fsm = StateMachine.new()
+	movement_fsm.setup(movement_states, movement_transitions, movement_init_state)
+	if movement_fsm.current_state:
+		movement_fsm.current_state.enter(self)
+
+
+func _physics_process(delta: float) -> void:
+	if(movement_fsm):
+		movement_fsm.process(self, delta)
+	print("Current state: %s" % movement_fsm.current_state.id)
+
+func play_animation(anim_name: String) -> void:
+	if animation_player == null:
+		push_warning("State '%s': player_anims is null, cannot play '%s'" % [movement_fsm.current_state.id, anim_name])
+		return
+	# TODO:
+	# null checks: no sprite frames
+	# no animation by name
+
+	if animation_player.current_animation != anim_name:
+		animation_player.play(anim_name)

player/player_controller.gd.uid

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+uid://bcipombqbxffa

player/setup_state.gd

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+extends Resource
+
+static var IdleState = preload("res://player/states/idle.gd")
+static var FallState = preload("res://player/states/fall.gd")
+
+static func build_states() -> Array[State]:
+	var list: Array[State] = []
+	list.append(_named(IdleState.new(), &"idle"))
+	list.append(_named(FallState.new(), &"fall"))
+	return list
+
+static func build_transitions() -> Array[StateTransition]:
+	var list: Array[StateTransition] = []
+
+	var t_is_on_floor = TransitionCondition.new(func(data):
+		return data.is_on_floor()
+		)
+	var t_n_is_on_floor = TransitionCondition.new(func(data):
+		return !data.is_on_floor()
+		)
+	
+	list.append(_edge(&"idle", &"fall", t_n_is_on_floor, 10))
+	list.append(_edge(&"fall", &"idle", t_is_on_floor, 10))
+
+	return list
+
+static func _named(state: State, id: StringName) -> State:
+	state.id = id
+	return state
+
+static func _edge(from: StringName, to: StringName, condition: TransitionCondition, priority: int) -> StateTransition:
+	var t:= StateTransition.new()
+	t.from = from
+	t.to = to
+	t.condition = condition
+	t.priority = priority
+	return t

player/setup_state.gd.uid

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+uid://d3vpouroevnpp

player/states/fall.gd

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+extends State
+
+func enter(char: Object) -> void:
+	char.play_animation("fall")
+
+func process(char: Object, delta: float) -> void:
+	char.velocity.y += 900.0 * delta
+	char.move_and_slide()

player/states/fall.gd.uid

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+uid://c1dkyfrnd4mcu

player/states/idle.gd

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+extends State
+
+func enter(char: Object) -> void:
+	char.play_animation("idle")
+	char.velocity.x = 0.0
+
+func process(char: Object, delta: float) -> void:
+	char.move_and_slide()

player/states/idle.gd.uid

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+uid://bq7nhigvlxpq5

project.godot

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+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=5
+
+[application]
+
+config/name="New Game Project 2"
+run/main_scene="uid://6xemlk773ni5"
+config/features=PackedStringArray("4.7", "GL Compatibility")
+config/icon="res://icon.svg"
+
+[display]
+
+window/stretch/mode="canvas_items"
+window/stretch/aspect="expand"
+
+[physics]
+
+3d/physics_engine="Jolt Physics"
+
+[rendering]
+
+rendering_device/driver.windows="d3d12"
+renderer/rendering_method="gl_compatibility"
+renderer/rendering_method.mobile="gl_compatibility"