lose screen animation

levels/greyscale.gdshader

@@ -0,0 +1,15 @@
+shader_type canvas_item;
+
+uniform float effect_amount: hint_range(0, 1) = 0.0;
+uniform sampler2D screen_texture : hint_screen_texture, repeat_disable, filter_nearest;
+
+void fragment() {
+	vec4 c = texture(screen_texture, SCREEN_UV);
+	float y = 0.2126 * c.r + 0.7152 * c.g + 0.0722 * c.b;
+	COLOR.rgb = mix(c.rgb, vec3(y), effect_amount);
+}
+
+//void light() {
+//	// Called for every pixel for every light affecting the CanvasItem.
+//	// Uncomment to replace the default light processing function with this one.
+//}