fix errors on skybox and brick wall shaders on export

fixed by preventing shader properties to be acessed before
ready and manually reassigning them on ready

stages/_base/skyboxes/skybox.gd

@@ -12,6 +12,7 @@ extends Sprite2D
 #--- constants ------------------------------------------------------------------------------------
 
 const SCENE_EXTRA := preload("res://stages/_base/skyboxes/extra_texture.tscn")
+const DEFAULT_TEXTURE1D = preload("res://stages/stage_01/background_elements/skyboxes/skybox_default_texture1d.tres")
 
 #--- public variables - order: export > normal var > onready --------------------------------------
 
@@ -53,16 +54,17 @@ var _extra_textures_data: Dictionary = {}
 
 var _tween: Tween
 
-var _shader_gradient := material.get_shader_parameter("gradient").gradient as Gradient
-
 var _all_clouds: Array[Sprite2D] = []
 
+var _shader_gradient: Gradient = null
+
 ### -----------------------------------------------------------------------------------------------
 
 
 ### Built in Engine Methods -----------------------------------------------------------------------
 
 func _ready() -> void:
+	_restore_shader_params()
 	item_rect_changed.connect(_resize_all_extra_nodes)
 
 	_reset_extra_nodes()
@@ -117,6 +119,19 @@ func stop_animations() -> void:
 
 ### Private Methods -------------------------------------------------------------------------------
 
+## This is a hack that for some reason is needed in the exported version because of a bug where 
+## all values from shader parameters loaded from tscns are lost, even though when running from 
+## the editor everything is fine.
+func _restore_shader_params() -> void:
+	var shader_material = (material as ShaderMaterial)
+	var texture_1D := DEFAULT_TEXTURE1D.duplicate(true)
+	shader_material.set_shader_parameter("gradient", texture_1D)
+	shader_material.set_shader_parameter("is_active", true)
+	shader_material.set_shader_parameter("show_grayscale", false)
+
+	_shader_gradient = texture_1D.gradient as Gradient
+
+
 func _reset_extra_nodes() -> void:
 	if not is_inside_tree():
 		await ready

stages/stage_01/background_elements/buildings/walls/brick_wall/brick_wall.gd

@@ -10,31 +10,38 @@ extends Sprite2D
 
 #--- constants ------------------------------------------------------------------------------------
 
+const DEFAULT_TEXTURE1D = preload("res://stages/stage_01/background_elements/buildings/walls/brick_wall/brick_wall_default_grayscale1D.tres")
+const DEFAULT_GRADIENT = preload("res://stages/stage_01/background_elements/buildings/walls/brick_wall/brick_wall_default_gradient.tres")
+
 #--- public variables - order: export > normal var > onready --------------------------------------
 
-@export var color_darkest: Color:
+@export var color_darkest: Color = Color.BLACK:
 	get:
-		return _get_shader_gradient_color_at(0, Color.BLACK)
+		return _get_shader_gradient_color_at(0, color_darkest)
 	set(value):
-		_set_shader_gradient_color_at(0, value)
+		color_darkest = value
+		_set_shader_gradient_color_at(0, color_darkest)
 
-@export var color_shadow: Color:
+@export var color_shadow: Color = Color.DARK_GRAY:
 	get:
-		return _get_shader_gradient_color_at(1, Color.DARK_GRAY)
+		return _get_shader_gradient_color_at(1, color_shadow)
 	set(value):
-		_set_shader_gradient_color_at(1, value)
+		color_shadow = value
+		_set_shader_gradient_color_at(1, color_shadow)
 
-@export var color_base: Color:
+@export var color_base: Color = Color.LIGHT_GRAY:
 	get:
-		return _get_shader_gradient_color_at(2, Color.LIGHT_GRAY)
+		return _get_shader_gradient_color_at(2, color_base)
 	set(value):
-		_set_shader_gradient_color_at(2, value)
+		color_base = value
+		_set_shader_gradient_color_at(2, color_base)
 
-@export var color_highlights: Color:
+@export var color_highlights: Color = Color.WHITE:
 	get:
-		return _get_shader_gradient_color_at(3, Color.WHITE)
+		return _get_shader_gradient_color_at(3, color_highlights)
 	set(value):
-		_set_shader_gradient_color_at(3, value)
+		color_highlights = value
+		_set_shader_gradient_color_at(3, color_highlights)
 
 #--- private variables - order: export > normal var > onready -------------------------------------
 
@@ -44,6 +51,7 @@ extends Sprite2D
 ### Built in Engine Methods -----------------------------------------------------------------------
 
 func _ready() -> void:
+	_restore_shader_params()
 	pass
 
 ### -----------------------------------------------------------------------------------------------
@@ -56,20 +64,41 @@ func _ready() -> void:
 
 ### Private Methods -------------------------------------------------------------------------------
 
+## This is a hack that for some reason is needed in the exported version because of a bug where 
+## all values from shader parameters loaded from tscns are lost, even though when running from 
+## the editor everything is fine.
+func _restore_shader_params() -> void:
+	var shader_material = (material as ShaderMaterial)
+	var texture_1D := DEFAULT_TEXTURE1D.duplicate(true)
+	var gradient := DEFAULT_GRADIENT.duplicate(true)
+	texture_1D.gradient = gradient
+	shader_material.set_shader_parameter("gradient", texture_1D)
+	shader_material.set_shader_parameter("is_active", true)
+	shader_material.set_shader_parameter("show_grayscale", false)
+
+	var count := 0
+	for color in [color_darkest, color_shadow, color_base, color_highlights]:
+		_set_shader_gradient_color_at(count, color)
+		count += 1
+
+
 func _get_shader_gradient_color_at(index: int, fallback_color := Color.BLACK) -> Color:
 	var value := fallback_color
-
-	var gradient := \
-			(material as ShaderMaterial).get_shader_parameter("gradient").gradient as Gradient
-	if gradient.get_point_count() != 4:
-		push_error("Brick wall's shader gradient must have 4 points.")
-	else:
-		value = gradient.get_color(index)
-
+	if is_inside_tree():
+		var gradient := \
+				(material as ShaderMaterial).get_shader_parameter("gradient").gradient as Gradient
+		if gradient.get_point_count() != 4:
+			push_error("Brick wall's shader gradient must have 4 points.")
+		else:
+			value = gradient.get_color(index)
+		
 	return value
 
 
 func _set_shader_gradient_color_at(index: int, value: Color) -> void:
+	if not is_inside_tree():
+		await ready
+
 	var gradient := \
 			(material as ShaderMaterial).get_shader_parameter("gradient").gradient as Gradient
 	if gradient.get_point_count() != 4:

stages/stage_01/background_elements/buildings/walls/brick_wall/brick_wall.tscn

@@ -4,20 +4,19 @@
 [ext_resource type="Texture2D" uid="uid://bwcbufs45uo2m" path="res://stages/stage_01/background_elements/buildings/walls/brick_wall/brick_pattern_grayscale.png" id="1_jk1bf"]
 [ext_resource type="Script" path="res://stages/stage_01/background_elements/buildings/walls/brick_wall/brick_wall.gd" id="3_ulpfj"]
 
-[sub_resource type="Gradient" id="Gradient_qf2sq"]
+[sub_resource type="Gradient" id="Gradient_kv5un"]
 resource_local_to_scene = true
 interpolation_mode = 2
 offsets = PackedFloat32Array(0, 0.268817, 0.575269, 0.854839)
-colors = PackedColorArray(0.0823529, 0.027451, 0.027451, 1, 0.505882, 0.137255, 0.121569, 1, 0.596078, 0.313726, 0.188235, 1, 0.745098, 0.572549, 0.411765, 1)
+colors = PackedColorArray(0, 0, 0, 1, 0.662745, 0.662745, 0.662745, 1, 0.827451, 0.827451, 0.827451, 1, 1, 1, 1, 1)
 
-[sub_resource type="GradientTexture1D" id="GradientTexture1D_wo2xc"]
+[sub_resource type="GradientTexture1D" id="GradientTexture1D_wstyt"]
 resource_local_to_scene = true
-gradient = SubResource("Gradient_qf2sq")
+gradient = SubResource("Gradient_kv5un")
 
 [sub_resource type="ShaderMaterial" id="ShaderMaterial_6j1ne"]
-resource_local_to_scene = true
 shader = ExtResource("1_eics1")
-shader_parameter/gradient = SubResource("GradientTexture1D_wo2xc")
+shader_parameter/gradient = SubResource("GradientTexture1D_wstyt")
 shader_parameter/is_active = true
 shader_parameter/show_grayscale = false
 
@@ -28,7 +27,4 @@ texture = ExtResource("1_jk1bf")
 region_enabled = true
 region_rect = Rect2(0, 0, 516, 513)
 script = ExtResource("3_ulpfj")
-color_darkest = Color(0.0823529, 0.027451, 0.027451, 1)
-color_shadow = Color(0.505882, 0.137255, 0.121569, 1)
-color_base = Color(0.596078, 0.313726, 0.188235, 1)
-color_highlights = Color(0.745098, 0.572549, 0.411765, 1)
+color_shadow = Color(0.662745, 0.662745, 0.662745, 1)

stages/stage_01/background_elements/buildings/walls/brick_wall/brick_wall_default_gradient.tres

@@ -0,0 +1,7 @@
+[gd_resource type="Gradient" format=3]
+
+[resource]
+resource_local_to_scene = true
+interpolation_mode = 2
+offsets = PackedFloat32Array(0, 0.268817, 0.575269, 0.854839)
+colors = PackedColorArray(0, 0, 0, 1, 0.662745, 0.662745, 0.662745, 1, 0.827451, 0.827451, 0.827451, 1, 1, 1, 1, 1)

stages/stage_01/background_elements/buildings/walls/brick_wall/brick_wall_default_grayscale1D.tres

@@ -0,0 +1,4 @@
+[gd_resource type="GradientTexture1D" format=3 uid="uid://pbndpcmcjj3w"]
+
+[resource]
+resource_local_to_scene = true

stages/stage_01/background_elements/skyboxes/skybox.tscn

@@ -1,7 +1,8 @@
-[gd_scene load_steps=34 format=3 uid="uid://ca6iowcjexjvn"]
+[gd_scene load_steps=33 format=3 uid="uid://ca6iowcjexjvn"]
 
 [ext_resource type="Texture2D" uid="uid://egjhs2885c00" path="res://stages/stage_01/background_elements/skyboxes/area_1_skybox_1_0.png" id="1_f6u5w"]
 [ext_resource type="Shader" path="res://stages/_base/skyboxes/gradient_map.gdshader" id="1_vpob3"]
+[ext_resource type="Texture2D" uid="uid://b8qv562jj6iw5" path="res://stages/stage_01/background_elements/skyboxes/skybox_default_texture1d.tres" id="2_mjq46"]
 [ext_resource type="Texture2D" uid="uid://d204xxt3ynf3w" path="res://stages/stage_01/background_elements/skyboxes/area_1_skybox_1_1.png" id="2_mvoff"]
 [ext_resource type="Script" path="res://stages/_base/skyboxes/skybox.gd" id="2_tgyol"]
 [ext_resource type="Texture2D" uid="uid://cagmug6l4do2d" path="res://stages/stage_01/background_elements/skyboxes/area_1_skybox_1_2.png" id="3_w15ne"]
@@ -10,17 +11,9 @@
 [ext_resource type="Script" path="res://stages/_base/skyboxes/skybox_extra_texture_data.gd" id="8_eudom"]
 [ext_resource type="Script" path="res://stages/_base/skyboxes/skybox_gradient_transitioner.gd" id="9_65dxk"]
 
-[sub_resource type="Gradient" id="Gradient_qs8id"]
-offsets = PackedFloat32Array(0, 0.259, 0.435, 0.656, 0.972)
-colors = PackedColorArray(0, 0.0456241, 0.109756, 1, 0, 0.415686, 1, 1, 0.192556, 0.689018, 0.957944, 1, 0.42856, 0.80186, 0.972127, 1, 0.882353, 0.972549, 0.992157, 1)
-
-[sub_resource type="GradientTexture1D" id="GradientTexture1D_fbtva"]
-gradient = SubResource("Gradient_qs8id")
-width = 1024
-
 [sub_resource type="ShaderMaterial" id="ShaderMaterial_3tgxg"]
 shader = ExtResource("1_vpob3")
-shader_parameter/gradient = SubResource("GradientTexture1D_fbtva")
+shader_parameter/gradient = ExtResource("2_mjq46")
 shader_parameter/is_active = true
 shader_parameter/show_grayscale = false
 
@@ -147,3 +140,5 @@ extra_textures_data = {
 5981265806675957122: SubResource("Resource_3txg3"),
 9107773377900830858: SubResource("Resource_yp3yx")
 }
+
+[node name="AnimationPlayer" type="AnimationPlayer" parent="."]

stages/stage_01/background_elements/skyboxes/skybox_default_texture1d.tres

@@ -0,0 +1,9 @@
+[gd_resource type="GradientTexture1D" load_steps=2 format=3 uid="uid://b8qv562jj6iw5"]
+
+[sub_resource type="Gradient" id="Gradient_qs8id"]
+offsets = PackedFloat32Array(0, 0.259, 0.435, 0.656, 0.972)
+colors = PackedColorArray(0, 0.0456241, 0.109756, 1, 0, 0.415686, 1, 1, 0.192556, 0.689018, 0.957944, 1, 0.42856, 0.80186, 0.972127, 1, 0.882353, 0.972549, 0.992157, 1)
+
+[resource]
+gradient = SubResource("Gradient_qs8id")
+width = 1024