Fix texture alpha deprecation warnings

src/chess.lua

@@ -1,6 +1,7 @@
 local realchess = {}
 local S = minetest.get_translator("xdecor")
 local FS = function(...) return minetest.formspec_escape(S(...)) end
+local ALPHA_OPAQUE = minetest.features.use_texture_alpha_string_modes and "opaque" or false
 screwdriver = screwdriver or {}
 
 local function index_to_xy(idx)
@@ -1429,6 +1430,7 @@ minetest.register_node(":realchess:chessboard", {
 	inventory_image = "chessboard_top.png",
 	wield_image = "chessboard_top.png",
 	tiles = {"chessboard_top.png", "chessboard_top.png", "chessboard_sides.png"},
+	use_texture_alpha = ALPHA_OPAQUE,
 	groups = {choppy=3, oddly_breakable_by_hand=2, flammable=3},
 	sounds = default.node_sound_wood_defaults(),
 	node_box = {type = "fixed", fixed = {-.375, -.5, -.375, .375, -.4375, .375}},

src/mechanisms.lua

@@ -6,6 +6,7 @@ local plate = {}
 screwdriver = screwdriver or {}
 
 local S = minetest.get_translator("xdecor")
+local ALPHA_OPAQUE = minetest.features.use_texture_alpha_string_modes and "opaque" or false
 
 local function door_toggle(pos_actuator, pos_door, player)
 	local player_name = player:get_player_name()
@@ -59,6 +60,7 @@ function plate.register(material, desc, def)
 	xdecor.register("pressure_" .. material .. "_off", {
 		description = def.description or (desc .. " Pressure Plate"),
 		tiles = {"xdecor_pressure_" .. material .. ".png"},
+		use_texture_alpha = ALPHA_OPAQUE,
 		drawtype = "nodebox",
 		node_box = xdecor.pixelbox(16, {{1, 0, 1, 14, 1, 14}}),
 		groups = def.groups,
@@ -70,6 +72,7 @@ function plate.register(material, desc, def)
 	})
 	xdecor.register("pressure_" .. material .. "_on", {
 		tiles = {"xdecor_pressure_" .. material .. ".png"},
+		use_texture_alpha = ALPHA_OPAQUE,
 		drawtype = "nodebox",
 		node_box = xdecor.pixelbox(16, {{1, 0, 1, 14, 0.4, 14}}),
 		groups = def.groups,
@@ -95,6 +98,7 @@ plate.register("stone", "Stone", {
 xdecor.register("lever_off", {
 	description = S("Lever"),
 	tiles = {"xdecor_lever_off.png"},
+	use_texture_alpha = ALPHA_OPAQUE,
 	drawtype = "nodebox",
 	node_box = xdecor.pixelbox(16, {{2, 1, 15, 12, 14, 1}}),
 	groups = {cracky = 3, oddly_breakable_by_hand = 2},
@@ -118,6 +122,7 @@ xdecor.register("lever_off", {
 
 xdecor.register("lever_on", {
 	tiles = {"xdecor_lever_on.png"},
+	use_texture_alpha = ALPHA_OPAQUE,
 	drawtype = "nodebox",
 	node_box = xdecor.pixelbox(16, {{2, 1, 15, 12, 14, 1}}),
 	groups = {cracky = 3, oddly_breakable_by_hand = 2, not_in_creative_inventory = 1},

src/nodes.lua

@@ -1,5 +1,7 @@
 screwdriver = screwdriver or {}
 local S = minetest.get_translator("xdecor")
+local ALPHA_CLIP = minetest.features.use_texture_alpha_string_modes and "clip" or true
+local ALPHA_OPAQUE = minetest.features.use_texture_alpha_string_modes and "opaque" or false
 
 local function register_pane(name, desc, def)
 	xpanes.register_pane(name, {
@@ -80,6 +82,7 @@ local function register_storage(name, desc, def)
 		inventory = {size = def.inv_size or 24},
 		infotext = desc,
 		tiles = def.tiles,
+		use_texture_alpha = ALPHA_OPAQUE,
 		node_box = def.node_box,
 		on_rotate = def.on_rotate,
 		on_place = def.on_place,
@@ -480,6 +483,7 @@ local painting_box = {
 xdecor.register("painting_1", {
 	description = S("Painting"),
 	tiles = {"xdecor_painting_1.png"},
+	use_texture_alpha = ALPHA_OPAQUE,
 	inventory_image = "xdecor_painting_empty.png",
 	wield_image = "xdecor_painting_empty.png",
 	paramtype2 = "wallmounted",
@@ -505,6 +509,7 @@ xdecor.register("painting_1", {
 for i = 2, 4 do
 	xdecor.register("painting_" .. i, {
 		tiles = {"xdecor_painting_" .. i .. ".png"},
+		use_texture_alpha = ALPHA_OPAQUE,
 		paramtype2 = "wallmounted",
 		drop = "xdecor:painting_1",
 		sunlight_propagates = true,
@@ -584,6 +589,7 @@ xdecor.register("tatami", {
 xdecor.register("trampoline", {
 	description = S("Trampoline"),
 	tiles = {"xdecor_trampoline.png", "mailbox_blank16.png", "xdecor_trampoline_sides.png"},
+	use_texture_alpha = ALPHA_CLIP,
 	groups = {cracky = 3, oddly_breakable_by_hand = 1, fall_damage_add_percent = -80, bouncy = 90},
 	node_box = xdecor.nodebox.slab_y(0.5),
 	sounds = {
@@ -616,6 +622,7 @@ xdecor.register("woodframed_glass", {
 	drawtype = "glasslike_framed",
 	sunlight_propagates = true,
 	tiles = {"xdecor_woodframed_glass.png", "xdecor_woodframed_glass_detail.png"},
+	use_texture_alpha = ALPHA_CLIP,
 	groups = {cracky = 2, oddly_breakable_by_hand = 1},
 	sounds = default.node_sound_glass_defaults()
 })

src/workbench.lua

@@ -310,6 +310,7 @@ for i = 1, #nodes do
 			drawtype = "nodebox",
 			sounds = def.sounds,
 			tiles = tiles,
+			use_texture_alpha = def.use_texture_alpha,
 			groups = groups,
 			-- `unpack` has been changed to `table.unpack` in newest Lua versions
 			node_box = xdecor.pixelbox(16, {unpack(d, 3)}),