Update game APIs for use_texture_alpha deprecation

mods/default/nodes.lua

@@ -2800,6 +2800,7 @@ minetest.register_node("default:glass", {
 	description = S("Glass"),
 	drawtype = "glasslike_framed_optional",
 	tiles = {"default_glass.png", "default_glass_detail.png"},
+	use_texture_alpha = "clip", -- only needed for stairs API
 	paramtype = "light",
 	paramtype2 = "glasslikeliquidlevel",
 	sunlight_propagates = true,
@@ -2812,6 +2813,7 @@ minetest.register_node("default:obsidian_glass", {
 	description = S("Obsidian Glass"),
 	drawtype = "glasslike_framed_optional",
 	tiles = {"default_obsidian_glass.png", "default_obsidian_glass_detail.png"},
+	use_texture_alpha = "clip", -- only needed for stairs API
 	paramtype = "light",
 	paramtype2 = "glasslikeliquidlevel",
 	is_ground_content = false,

mods/stairs/init.lua

@@ -63,6 +63,8 @@ end
 
 function stairs.register_stair(subname, recipeitem, groups, images, description,
 		sounds, worldaligntex)
+	local src_def = minetest.registered_nodes[recipeitem]
+
 	-- Set backface culling and world-aligned textures
 	local stair_images = {}
 	for i, image in ipairs(images) do
@@ -91,6 +93,7 @@ function stairs.register_stair(subname, recipeitem, groups, images, description,
 		description = description,
 		drawtype = "nodebox",
 		tiles = stair_images,
+		use_texture_alpha = src_def and src_def.use_texture_alpha,
 		paramtype = "light",
 		paramtype2 = "facedir",
 		is_ground_content = false,
@@ -162,6 +165,8 @@ end
 
 function stairs.register_slab(subname, recipeitem, groups, images, description,
 		sounds, worldaligntex)
+	local src_def = minetest.registered_nodes[recipeitem]
+
 	-- Set world-aligned textures
 	local slab_images = {}
 	for i, image in ipairs(images) do
@@ -186,6 +191,7 @@ function stairs.register_slab(subname, recipeitem, groups, images, description,
 		description = description,
 		drawtype = "nodebox",
 		tiles = slab_images,
+		use_texture_alpha = src_def and src_def.use_texture_alpha,
 		paramtype = "light",
 		paramtype2 = "facedir",
 		is_ground_content = false,
@@ -297,6 +303,8 @@ end
 
 function stairs.register_stair_inner(subname, recipeitem, groups, images,
 		description, sounds, worldaligntex, full_description)
+	local src_def = minetest.registered_nodes[recipeitem]
+
 	-- Set backface culling and world-aligned textures
 	local stair_images = {}
 	for i, image in ipairs(images) do
@@ -330,6 +338,7 @@ function stairs.register_stair_inner(subname, recipeitem, groups, images,
 		description = description,
 		drawtype = "nodebox",
 		tiles = stair_images,
+		use_texture_alpha = src_def and src_def.use_texture_alpha,
 		paramtype = "light",
 		paramtype2 = "facedir",
 		is_ground_content = false,
@@ -384,6 +393,8 @@ end
 
 function stairs.register_stair_outer(subname, recipeitem, groups, images,
 		description, sounds, worldaligntex, full_description)
+	local src_def = minetest.registered_nodes[recipeitem]
+
 	-- Set backface culling and world-aligned textures
 	local stair_images = {}
 	for i, image in ipairs(images) do
@@ -417,6 +428,7 @@ function stairs.register_stair_outer(subname, recipeitem, groups, images,
 		description = description,
 		drawtype = "nodebox",
 		tiles = stair_images,
+		use_texture_alpha = src_def and src_def.use_texture_alpha,
 		paramtype = "light",
 		paramtype2 = "facedir",
 		is_ground_content = false,

mods/xpanes/init.lua

@@ -116,7 +116,7 @@ function xpanes.register_pane(name, def)
 		groups = flatgroups,
 		drop = "xpanes:" .. name .. "_flat",
 		sounds = def.sounds,
-		use_texture_alpha = def.use_texture_alpha or false,
+		use_texture_alpha = def.use_texture_alpha and "blend" or "clip",
 		node_box = {
 			type = "fixed",
 			fixed = {{-1/2, -1/2, -1/32, 1/2, 1/2, 1/32}},
@@ -145,7 +145,7 @@ function xpanes.register_pane(name, def)
 		groups = groups,
 		drop = "xpanes:" .. name .. "_flat",
 		sounds = def.sounds,
-		use_texture_alpha = def.use_texture_alpha or false,
+		use_texture_alpha = def.use_texture_alpha and "blend" or "clip",
 		node_box = {
 			type = "connected",
 			fixed = {{-1/32, -1/2, -1/32, 1/32, 1/2, 1/32}},