Reenable dynamic shadows (#11)

When setting sun and moon to visible = false, dynamic shadows would not display any more.
In combination with the high-resolution skyboxes, they increase graphical quality quite a bit.
Setting sun and moon to an empty texture instead keeps dynamic shadows intact.

init.lua

@@ -41,22 +41,41 @@ skybox.set = function(player, number)
 	else
 		local sky = skies[number]
 		player:override_day_night_ratio(sky[3])
-		player:set_sky(sky[2], "skybox", {
+		local textures = {
 			sky[1] .. "Up.jpg",
 			sky[1] .. "Down.jpg",
 			sky[1] .. "Front.jpg",
 			sky[1] .. "Back.jpg",
 			sky[1] .. "Left.jpg",
 			sky[1] .. "Right.jpg",
-		}, true)
+		}
+		if player.get_sky_color ~= nil then
+			player:set_sky({
+				base_color = sky[2],
+				type = "skybox",
+				textures = textures,
+				clouds = true
+			})
+			-- making the sun invisible deactivates the dynamic shadows
+			-- making the sun visible with an invisible texture keeps shadows intact
+			player:set_sun({visible = true, sunrise_visible = false, texture = "blank.png"})
+			player:set_moon({visible = true, texture = "blank.png"})
+			player:set_stars({visible = false})
+		else
+			player:set_sky(sky[2], "skybox", textures, true)
+		end
 		player:set_clouds(sky[4])
-		player:set_attribute("skybox:skybox", sky[1])
+		player:get_meta():set_string("skybox:skybox", sky[1])
 	end
 end
 
 skybox.clear = function(player)
 	player:override_day_night_ratio(nil)
-	player:set_sky("white", "regular")
+	if player.get_sky_color ~= nil then
+		player:set_sky({base_color = "white", type = "regular"})
+	else
+		player:set_sky("white", "regular")
+	end
 	player:set_clouds({
 		density = 0.4,
 		color = "#fff0f0e5",
@@ -65,20 +84,27 @@ skybox.clear = function(player)
 		thickness = 16,
 		speed = {x = 0, y = -2},
 	})
-	player:set_attribute("skybox:skybox", "off")
+	player:set_sun({visible = true, sunrise_visible = true, texture = ""})
+	player:set_moon({visible = true, texture = ""})
+	player:set_stars({visible = true})
+
+	player:get_meta():set_string("skybox:skybox", "off")
 end
 
 skybox.add = function(def)
-	table.add(skies, def)
+	table.insert(skies, def)
+end
+
+skybox.get_skies = function()
+	return table.copy(skies)
 end
 
 --
 -- registrations and load/save code
 --
 
-minetest.register_on_joinplayer(function(player)
-	local sky = player:get_attribute("skybox:skybox")
-	print(dump(sky))
+skybox.restore = function(player)
+	local sky = player:get_meta():get_string("skybox:skybox")
 	if not sky or sky == "" then
 		skybox.clear(player)
 	else
@@ -90,7 +116,8 @@ minetest.register_on_joinplayer(function(player)
 		end
 		skybox.clear(player)
 	end
-end)
+end
+minetest.register_on_joinplayer(skybox.restore)
 
 minetest.register_privilege("skybox", {
 	description = "Change sky box for yourself",

readme.md

@@ -33,9 +33,23 @@ The `skybox` handle can be used to perform various actions:
 `skybox.set(player, number)`
  -- Sets the skybox to the `number` in the list of current skyboxes.
 
+`skybox.restore(player)`
+ -- Reverts the player skybox to the last `skybox.set()` value.
+ -- Other skybox mods can properly restore the player's custom skybox.
+
 `skybox.add(skyboxdef)`
  -- Add a new skybox with skyboxdef to the list of available skyboxes.
 
+`skybox.get_skies()`
+ -- Get a list of availiable skyboxes
+ -- Example value of `skybox.get_skies()[1]`:
+ --[[
+     ```lua
+    {"DarkStormy", "#1f2226", 0.5, { density = 0.5, color = "#aaaaaae0", ambient = "#000000",
+    	height = 64, thickness = 32, speed = {x = 6, y = -6},}},
+	```
+ ]]
+
 
 ```
 skyboxdef = {