niveau/transitions: shader de transition

Entre les niveaux et à la mort il y a maintenant un fondu au noir qui se
met en place pour éviter d'avoir la gerbe sur les mouvements de caméra.
la physique est en pause pendant la transition.

HUD/fart_gauge.gd

@@ -24,6 +24,7 @@ func dash_fart() -> bool:
 func reset():
     animationPlayer.play("RESET")
     loaded = false
+    loading = false
 
 func _on_animation_player_animation_finished(anim_name: StringName) -> void:
     if anim_name == "reload":

HUD/hud.gd

@@ -4,7 +4,11 @@ class_name HUD extends CanvasLayer
 @onready var gauge2 := $FartGauge2 as FartGauge
 @onready var gauge3 := $FartGauge3 as FartGauge
 
+@onready var shader := $TransitionShader
+
 signal fart_reloaded()
+signal screen_is_black()
+signal screen_is_ready()
 
 var cheese_number = 0
 var gauges = []
@@ -15,7 +19,6 @@ func _ready() -> void:
     gauge3.connect("reload_done", cheese_loaded)
     gauges = [gauge1, gauge2, gauge3]
 
-
 func reset():
     cheese_number = 0
     for gauge in gauges:
@@ -34,3 +37,17 @@ func dash_fart():
 
 func cheese_loaded():
     fart_reloaded.emit()
+
+func begin_scene_transition():
+    print("start scene transition")
+    shader.fade_out()
+
+func end_scene_transition():
+    print("end scene transition")
+    shader.fade_in()
+
+func _on_transition_shader_fade_in_done() -> void:
+    screen_is_ready.emit()
+
+func _on_transition_shader_fade_out_done() -> void:
+    screen_is_black.emit()

HUD/hud.tscn

@@ -1,8 +1,11 @@
-[gd_scene load_steps=2 format=3 uid="uid://dvlb4thqhqke"]
+[gd_scene load_steps=4 format=3 uid="uid://dvlb4thqhqke"]
 
 [ext_resource type="PackedScene" uid="uid://dsgt6b1bqi6ui" path="res://HUD/fart_gauge.tscn" id="1_4e2i3"]
+[ext_resource type="Script" path="res://HUD/hud.gd" id="1_e1sc7"]
+[ext_resource type="PackedScene" uid="uid://17macg0q4k8l" path="res://shaders/transition_shader.tscn" id="2_gh8iu"]
 
 [node name="HUD" type="CanvasLayer"]
+script = ExtResource("1_e1sc7")
 
 [node name="FartGauge3" parent="." instance=ExtResource("1_4e2i3")]
 position = Vector2(242, 6)
@@ -18,3 +21,10 @@ scale = Vector2(0.7, 0.7)
 position = Vector2(51, 6)
 rotation = -1.5708
 scale = Vector2(0.7, 0.7)
+
+[node name="TransitionShader" parent="." instance=ExtResource("2_gh8iu")]
+offset_right = 0.0
+offset_bottom = 0.0
+
+[connection signal="fade_in_done" from="TransitionShader" to="." method="_on_transition_shader_fade_in_done"]
+[connection signal="fade_out_done" from="TransitionShader" to="." method="_on_transition_shader_fade_out_done"]