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+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="Ground"]
+position = Vector2(28, 978)
+shape = SubResource("RectangleShape2D_s3b2g")
+
+[node name="Shaders" type="Node2D" parent="."]
+
+[node name="1_SimpleNoiseTex" type="MeshInstance2D" parent="Shaders"]
+material = SubResource("ShaderMaterial_jp0bh")
+position = Vector2(-577, 289)
+mesh = SubResource("QuadMesh_wtyjt")
+
+[node name="Label2" type="Label" parent="Shaders/1_SimpleNoiseTex"]
+offset_left = -333.0
+offset_top = -703.0
+offset_right = 1299.0
+offset_bottom = -220.0
+text = "1) Lecture de texture
+
+Bon tu connais la chanson, va dans shaders et
+clique sur le shader avec 1 devant
+
+Lis bien les commentaires du code ! (y'a un TODO)"
+label_settings = SubResource("LabelSettings_yllor")
+
+[node name="2_ReadScreenTex" type="MeshInstance2D" parent="Shaders"]
+material = SubResource("ShaderMaterial_0olsu")
+position = Vector2(747, 189)
+mesh = SubResource("QuadMesh_wtyjt")
+
+[node name="Label3" type="Label" parent="Shaders/2_ReadScreenTex"]
+offset_left = -233.0
+offset_top = -635.0
+offset_right = 1399.0
+offset_bottom = -221.0
+text = "2) Texture d'ecran
+
+Bouge le noeud 2_ReadScreenTex 
+sur l'ecran. Qu'est-ce qui se passe ? Va dans le shaders, 
+et lis les commentaires
+ (y'a un TODO)"
+label_settings = SubResource("LabelSettings_yllor")
+
+[node name="3_SimpleVertexShader" type="MeshInstance2D" parent="Shaders"]
+material = SubResource("ShaderMaterial_pld4h")
+position = Vector2(2363, 189)
+mesh = SubResource("QuadMesh_wtyjt")
+
+[node name="Label3" type="Label" parent="Shaders/3_SimpleVertexShader"]
+offset_left = -233.0
+offset_top = -635.0
+offset_right = 1399.0
+offset_bottom = -221.0
+text = "3) Simple vertex shader
+
+Regarde le code
+et lis les commentaires
+ (y'a un TODO)"
+label_settings = SubResource("LabelSettings_yllor")
+
+[node name="Labels" type="Node2D" parent="Shaders"]
+
+[node name="Label" type="Label" parent="Shaders/Labels"]
+offset_left = -2214.0
+offset_top = -324.0
+offset_right = -582.0
+offset_bottom = -117.0
+text = "Bienvenue dans l'exo 2 !
+Finit les tableaux, on va voir des shaders plus 
+utiles et interessants !"
+label_settings = SubResource("LabelSettings_yllor")

exo2/scripts/cam_follow.gd

@@ -0,0 +1,18 @@
+extends Camera2D
+
+@export var lana : Lana
+@export var lerp_speed := 10
+
+var target_pos : Vector2
+
+func _ready() -> void:
+	target_pos = lana.position
+
+func _process(delta: float) -> void:
+	#var screen_center : Vector2 = get_screen_center_position()
+	var diff := lana.position.x - target_pos.x
+	var screen_size := get_viewport_rect().size.x
+	if abs(diff) > screen_size / 2:
+		target_pos.x += screen_size * sign(diff)
+		
+	position.x = lerp(position.x, target_pos.x, lerp_speed*delta)

exo2/scripts/cam_follow.gd.uid

@@ -0,0 +1 @@
+uid://0cv88akfi7rx

exo2/shaders/1_simple_noise_exemple.gdshader

@@ -0,0 +1,22 @@
+shader_type canvas_item;
+
+// Uniform c'est comme les exports en gdscripts. Pour y avoir acces et les changer :
+// Va dans l'inspecteur de Exo2/Shaders/1_SimpleNoiseTex (dans ta scene)
+// Va dans la partie CanvasItem
+// Clique sur Material (de canvasItem fais attention)
+// Clique sur l'onglet Shader Parameters
+uniform float speed;
+uniform sampler2D noise_tex : repeat_enable;
+
+
+void fragment() {
+	vec2 new_uv = UV + speed * TIME * vec2(1, 1);
+	COLOR.a = texture(noise_tex, new_uv).r; 
+	// Color.a c'est l'alpha. alpha de 0 : l'objet est transparent. alpha de 1 l'objet est visible
+	// .r car la texture renvoie une couleur, et on veut juste un float
+}
+// Change un peu les parametres, voir ce que ca fait.
+// TODO :
+// Change la couleur, je veux du bleu pas du blanc.
+// Dans Noise Tex, change le Noise Type.
+// Je pense Cellular donne un bon truc

exo2/shaders/1_simple_noise_exemple.gdshader.uid

@@ -0,0 +1 @@
+uid://bxh7ct2ofg1xy

exo2/shaders/2_read_screen_tex.gdshader

@@ -0,0 +1,34 @@
+shader_type canvas_item;
+render_mode blend_disabled;
+
+// On definit un uniform, donc quelque chose que le shader a en input
+// ici hint_screen_texture signifie qu'on recupere la texture de l'ecran
+// repeat_disable qu'on souhaite pas que la texture soit infinie et se repete
+// filter_nearest qu'on veut pas d'interpolation bizzare
+uniform sampler2D screen_tex : hint_screen_texture, repeat_disable, filter_nearest;
+uniform vec3 new_green_color : source_color;
+
+void fragment() {
+	// Called for every pixel the material is visible on.
+	vec3 screen_color = texture(screen_tex, SCREEN_UV).rgb;
+	// Le produit scalaire (dot) est tres utile pour avoir une sorte de distance entre deux vecteurs
+	// On veut savoir si le pixel derriere est vert, 
+	// donc on compare ca au vecteur vert rgb normalize (vec3(0, 1, 0)) 
+	bool is_green = dot(normalize(screen_color), vec3(0, 1, 0)) > 0.69;
+	if (is_green){
+		// Moyenne ponderee, pour eviter d'avoir que du rouge (trop flat)
+		COLOR.rgb = (3.0*new_green_color + screen_color)/4.0;
+	}
+	else{
+		COLOR.rgb = screen_color;
+	}
+	// TODO
+	// Ajoute du bruit, je veux que les feuilles aient du bruit
+	// Ajoute une sorte de cadre, je veux bien voir les bordures de l'effet
+	
+}
+
+//void light() {
+//	// Called for every pixel for every light affecting the CanvasItem.
+//	// Uncomment to replace the default light processing function with this one.
+//}

exo2/shaders/2_read_screen_tex.gdshader.uid

@@ -0,0 +1 @@
+uid://pie6shk758tp

exo2/shaders/3_simple_vertex_shader.gdshader

@@ -0,0 +1,14 @@
+shader_type canvas_item;
+
+void vertex() {
+	VERTEX.y = sin(TIME);
+}
+
+void fragment() {
+	// Called for every pixel the material is visible on.
+}
+
+//void light() {
+//	// Called for every pixel for every light affecting the CanvasItem.
+//	// Uncomment to replace the default light processing function with this one.
+//}

exo2/shaders/3_simple_vertex_shader.gdshader.uid

@@ -0,0 +1 @@
+uid://djppqek35tujs