Ajout des nuages

* ajout d'un effet de post processing de nuage qui réagit à la recharge

common/vfx/materials/shaders/screen_clouds.gdshader

@@ -0,0 +1,48 @@
+// Based on https://godotshaders.com/shader/screen-smoke-fog/
+shader_type canvas_item;
+render_mode blend_mul;
+
+// Stuff related to camera position and offsets
+uniform vec2 camera_position;
+uniform vec2 camera_zoom = vec2(1.0);
+uniform vec2 viewport_size = vec2(1920.0, 1080.0);
+
+// Uniforms for customization
+uniform sampler2D noise_texture : repeat_enable;
+uniform float cloud_speed : hint_range(0.0, 1.0) 	= 1.0;
+uniform float cloud_delay : hint_range(0.0, 100.0) 	= 1.0;
+uniform vec2 noise_dir = vec2(1.0,+1.0);
+uniform vec3 cloud_color : source_color = vec3(0.8);
+uniform float cloud_alpha : hint_range(0.0, 1.0) = 1.0;
+uniform float cloud_size : hint_range(1.0, 100.0) = 10.0;
+uniform float cloud_distorsion_speed : hint_range(0.0, 1.) = 0.05;
+uniform float density : hint_range(0.0, 1.0) 	= 1.0;
+uniform float blur_amount : hint_range(0.0, 1.0) 	= 1.0;
+
+void fragment() {
+	vec2 world_pos = (UV - 0.5) * (viewport_size) / camera_zoom + camera_position;
+
+    //COLOR=texture(noise_texture, world_pos * (1./(cloud_size*100.)));
+    
+    float time = TIME+cloud_delay;
+
+	vec2 time_offset = time * noise_dir * cloud_speed * 0.01;
+	vec2 distorsion_time_offset = time * noise_dir * (cloud_speed + vec2(cloud_distorsion_speed,cloud_distorsion_speed)) * 0.01;
+    
+	vec2 cloud_uv = world_pos * (1./(cloud_size*100.)) + time_offset;
+    vec2 distorsion_cloud_uv = world_pos * (1./(cloud_size*100.)) + distorsion_time_offset;
+    
+	float final_noise = (
+        texture(noise_texture, cloud_uv) * 0.5 +
+        texture(noise_texture, distorsion_cloud_uv) * 0.5
+    ).r;
+    
+    float edge = smoothstep(density - blur_amount * 0.5, density + blur_amount * 0.5, final_noise);
+    
+    COLOR = vec4(mix(cloud_color, vec3(1.0), edge), 1.0);
+    
+    //if (final_noise < density) {
+        //COLOR = vec4(cloud_color.r,cloud_color.g,cloud_color.b,1.);
+    //} else
+        //COLOR = vec4(1.,1.,1.,1.);
+}