Fix Warning spam about use_texture_alpha

* Previously the alpha value in the nodedef indicated the transparency
  the water was actually rendered with. Now only the alpha in the texture
  is respected.
* Closes and fixes https://github.com/minetest/minetest_game/issues/2819
* Backported https://github.com/minetest/minetest_game/pull/2822
* this is the same as https://github.com/minetest/minetest_game/pull/2729

mods/default/nodes.lua

@@ -208,6 +208,11 @@ default:cloud
 -- Stone
 --
 
+local is_54 = minetest.has_feature("direct_velocity_on_players") or false
+local alpha_use_texture_alpha = true
+
+if is_54 then alpha_use_texture_alpha = "blend" end
+
 minetest.register_node("default:stone", {
 	description = "Stone",
 	tiles = {"default_stone.png"},
@@ -1508,6 +1513,7 @@ minetest.register_node("default:water_source", {
 		},
 	},
 	alpha = 160,
+	use_texture_alpha = alpha_use_texture_alpha,
 	paramtype = "light",
 	walkable = false,
 	pointable = false,
@@ -1552,6 +1558,7 @@ minetest.register_node("default:water_flowing", {
 		},
 	},
 	alpha = 160,
+	use_texture_alpha = alpha_use_texture_alpha,
 	paramtype = "light",
 	paramtype2 = "flowingliquid",
 	walkable = false,
@@ -1599,6 +1606,7 @@ minetest.register_node("default:river_water_source", {
 		},
 	},
 	alpha = 160,
+	use_texture_alpha = alpha_use_texture_alpha,
 	paramtype = "light",
 	walkable = false,
 	pointable = false,
@@ -1645,6 +1653,7 @@ minetest.register_node("default:river_water_flowing", {
 		},
 	},
 	alpha = 160,
+	use_texture_alpha = alpha_use_texture_alpha,
 	paramtype = "light",
 	paramtype2 = "flowingliquid",
 	walkable = false,
@@ -2185,6 +2194,7 @@ local function register_sign(material, desc, def)
 		sunlight_propagates = true,
 		is_ground_content = false,
 		walkable = false,
+		use_texture_alpha = (is_54 and "opaque" or alpha_use_texture_alpha),
 		node_box = {
 			type = "wallmounted",
 			wall_top    = {-0.4375, 0.4375, -0.3125, 0.4375, 0.5, 0.3125},
@@ -2326,6 +2336,7 @@ minetest.register_node("default:glass", {
 	description = "Glass",
 	drawtype = "glasslike_framed_optional",
 	tiles = {"default_glass.png", "default_glass_detail.png"},
+	use_texture_alpha = (is_54 and "clip" or alpha_use_texture_alpha),
 	paramtype = "light",
 	paramtype2 = "glasslikeliquidlevel",
 	sunlight_propagates = true,
@@ -2338,6 +2349,7 @@ minetest.register_node("default:obsidian_glass", {
 	description = "Obsidian Glass",
 	drawtype = "glasslike_framed_optional",
 	tiles = {"default_obsidian_glass.png", "default_obsidian_glass_detail.png"},
+	use_texture_alpha = (is_54 and "clip" or alpha_use_texture_alpha),
 	paramtype = "light",
 	paramtype2 = "glasslikeliquidlevel",
 	is_ground_content = false,
@@ -2375,6 +2387,7 @@ minetest.register_node("default:mese_post_light", {
 	tiles = {"default_mese_post_light_top.png", "default_mese_post_light_top.png",
 		"default_mese_post_light_side_dark.png", "default_mese_post_light_side_dark.png",
 		"default_mese_post_light_side.png", "default_mese_post_light_side.png"},
+	use_texture_alpha = (is_54 and "clip" or alpha_use_texture_alpha),
 	wield_image = "default_mese_post_light_side.png",
 	drawtype = "nodebox",
 	node_box = {

mods/default/torch.lua

@@ -35,6 +35,8 @@ See LICENSE.txt and http://www.gnu.org/licenses/lgpl-2.1.txt
 
 --]]
 
+local is_54 = minetest.has_feature("direct_velocity_on_players") or false
+
 minetest.register_node("default:torch", {
 	description = "Torch",
 	drawtype = "mesh",
@@ -94,6 +96,7 @@ minetest.register_node("default:torch_wall", {
 		    name = "default_torch_on_floor_animated.png",
 		    animation = {type = "vertical_frames", aspect_w = 16, aspect_h = 16, length = 3.3}
 	}},
+	use_texture_alpha = (is_54 and "clip" or true),
 	paramtype = "light",
 	paramtype2 = "wallmounted",
 	sunlight_propagates = true,
@@ -115,6 +118,7 @@ minetest.register_node("default:torch_ceiling", {
 		    name = "default_torch_on_floor_animated.png",
 		    animation = {type = "vertical_frames", aspect_w = 16, aspect_h = 16, length = 3.3}
 	}},
+	use_texture_alpha = (is_54 and "clip" or true),
 	paramtype = "light",
 	paramtype2 = "wallmounted",
 	sunlight_propagates = true,

mods/doors/init.lua

@@ -1,5 +1,6 @@
 
-local is_53 = minetest.has_feature("object_step_has_moveresult")
+local is_53 = minetest.has_feature("object_step_has_moveresult") or false
+local is_54 = minetest.has_feature("direct_velocity_on_players") or false
 
 -- our API object
 doors = {
@@ -128,7 +129,7 @@ minetest.register_node("doors:hidden", {
 	paramtype = "light",
 	paramtype2 = "facedir",
 	sunlight_propagates = true,
-	use_texture_alpha = "clip",
+	use_texture_alpha = (is_54 and "clip" or true),
 	-- has to be walkable for falling nodes to stop falling.
 	walkable = true,
 	pointable = false,
@@ -526,7 +527,7 @@ function doors.register(name, def)
 	def.paramtype = "light"
 	def.paramtype2 = "facedir"
 	def.sunlight_propagates = true
-	def.use_texture_alpha = def.use_texture_alpha or "clip"
+	def.use_texture_alpha = def.use_texture_alpha or (is_54 and "clip" or true)
 	def.walkable = true
 	def.is_ground_content = false
 	def.buildable_to = false
@@ -737,7 +738,7 @@ function doors.register_trapdoor(name, def)
 	def.drawtype = "nodebox"
 	def.paramtype = "light"
 	def.paramtype2 = "facedir"
-	def.use_texture_alpha = def.use_texture_alpha or "clip"
+	def.use_texture_alpha = def.use_texture_alpha or (is_54 and "clip" or true)
 	def.is_ground_content = false
 
 	if def.protected then

mods/farming/compatibility.lua

@@ -3,6 +3,7 @@ local S = farming.intllib
 
 --= Helpers
 
+local is_54 = minetest.has_feature("direct_velocity_on_players") or false
 local eth = minetest.get_modpath("ethereal")
 local alias = function(orig, new)
 	minetest.register_alias(orig, new)
@@ -36,6 +37,7 @@ minetest.override_item("default:apple", {
 		"apple_side.png",
 		"apple_side.png",
 	},
+	use_texture_alpha = (is_54 and "clip" or false),
 	groups = {food_apple = 1, fleshy = 3, dig_immediate = 3, flammable = 2,
 		leafdecay = 3, leafdecay_drop = 1}
 })

mods/farming/crops/garlic.lua

@@ -6,6 +6,7 @@
 ]]
 
 local S = farming.intllib
+local is_54 = minetest.has_feature("direct_velocity_on_players") or false
 
 -- garlic clove
 minetest.register_craftitem("farming:garlic_clove", {
@@ -45,7 +46,7 @@ minetest.register_node("farming:garlic_braid", {
 	inventory_image = "crops_garlic_braid.png",
 	wield_image = "crops_garlic_braid.png",
 	drawtype = "nodebox",
-	use_texture_alpha = "clip",
+	use_texture_alpha = (is_54 and "clip" or true),
 	paramtype = "light",
 	paramtype2 = "facedir",
 	tiles = {

mods/flowers/init.lua

@@ -6,6 +6,7 @@
 
 flowers = {}
 
+local is_54 = minetest.has_feature("direct_velocity_on_players") or false
 
 -- Map Generation
 
@@ -271,6 +272,7 @@ minetest.register_node("flowers:waterlily", {
 	tiles = {"flowers_waterlily.png", "flowers_waterlily_bottom.png"},
 	inventory_image = "flowers_waterlily.png",
 	wield_image = "flowers_waterlily.png",
+	use_texture_alpha = (is_54 and "clip" or true),
 	liquids_pointable = true,
 	walkable = false,
 	buildable_to = true,

mods/stairs/init.lua

@@ -1,4 +1,6 @@
 
+local is_54 = minetest.has_feature("direct_velocity_on_players") or false
+
 -- wool sounds
 function default.node_sound_wool_defaults(table)
 
@@ -24,7 +26,7 @@ stairs = {
 }
 
 -- add new 5.x snow sounds to 0.4.x client
---if not minetest.has_feature("object_use_texture_alpha") then
+if not stairs.node_sound_snow_defaults then
 	function stairs.node_sound_snow_defaults(table)
 
 		table = table or {}
@@ -35,7 +37,7 @@ stairs = {
 
 		return table
 	end
---end
+end
 
 
 -- cache creative
@@ -136,8 +138,9 @@ local function get_node_vars(nodename)
 	if def then
 		return def.light_source, def.use_texture_alpha, def.sunlight_propagates
 	end
+	if is_54 then return 0, "clip", nil end
 
-	return nil, nil, nil
+	return false, true, nil
 end
 
 

mods/xdecor/src/workbench.lua

@@ -1,6 +1,7 @@
 local workbench = {}
 local nodes = {}
 
+local is_54 = minetest.has_feature("direct_velocity_on_players") or false
 screwdriver = screwdriver or {}
 local min, ceil = math.min, math.ceil
 local S = xdecor.S
@@ -343,7 +344,7 @@ for i = 1, #nodes do
 			drawtype = "nodebox",
 			sounds = def.sounds,
 			tiles = tiles,
-			use_texture_alpha = def.use_texture_alpha,
+			use_texture_alpha = def.use_texture_alpha or (is_54 and "clip" or true),
 			groups = groups,
 			-- `unpack` has been changed to `table.unpack` in newest Lua versions
 			node_box = xdecor.pixelbox(16, {unpack(d, 3)}),

mods/xpanes/init.lua

@@ -1,4 +1,6 @@
 
+local is_54 = minetest.has_feature("direct_velocity_on_players") or false
+
 local function is_pane(pos)
 	return minetest.get_item_group(minetest.get_node(pos).name, "pane") > 0
 end
@@ -104,6 +106,7 @@ function xpanes.register_pane(name, def)
 		groups = flatgroups,
 		drop = "xpanes:" .. name .. "_flat",
 		sounds = def.sounds,
+		use_texture_alpha = def.use_texture_alpha or (is_54 and "opaque" or false),
 		node_box = {
 			type = "fixed",
 			fixed = {{-1/2, -1/2, -1/32, 1/2, 1/2, 1/32}},
@@ -128,6 +131,7 @@ function xpanes.register_pane(name, def)
 		groups = groups,
 		drop = "xpanes:" .. name .. "_flat",
 		sounds = def.sounds,
+		use_texture_alpha = def.use_texture_alpha or (is_54 and "opaque" or false),
 		node_box = {
 			type = "connected",
 			fixed = {{-1/32, -1/2, -1/32, 1/32, 1/2, 1/32}},