to_float32 and fix hud_manager checks for changed values which are st…

…ored intermediately as float32

minetest/hud_manager.lua

@@ -65,6 +65,13 @@ function ManagedHud:toggle_enabled(player)
 	return enabled
 end
 
+local function v2f_to_float_32(v)
+	return {
+		x = futil.math.to_float32(v.x),
+		y = futil.math.to_float32(v.y),
+	}
+end
+
 function ManagedHud:update(player, data)
 	local is_enabled = self:is_enabled(player)
 	local player_name = player:get_player_name()
@@ -99,7 +106,11 @@ function ManagedHud:update(player, data)
 
 		if old_hud_def then
 			for k, v in pairs(new_hud_def) do
-				if old_hud_def[k] ~= v and k ~= "type" and k ~= "hud_elem_type" then
+				if k == "position" or k == "scale" or k == "align" or k == "offset" then
+					v = v2f_to_float_32(v)
+				end
+
+				if not futil.equals(old_hud_def[k], v) and k ~= "type" and k ~= "hud_elem_type" then
 					player:hud_change(hud_id, k, v)
 				end
 			end

util/math.lua

@@ -1,6 +1,7 @@
 futil.math = {}
 
 local floor = math.floor
+local huge = math.huge
 local max = math.max
 local min = math.min
 
@@ -150,3 +151,12 @@ function futil.math.round(number, mult)
 		return round(number)
 	end
 end
+
+-- TODO this doesn't handle out-of-bounds exponents
+function futil.math.to_float32(number)
+	if number == huge or number == -huge or number ~= number then
+		return number
+	end
+	local sign, significand, exponent = ("%a"):format(number):match("^(-?)0x([0-9a-f\\.]+)p([0-9+-]+)$")
+	return tonumber(("%s0x%sp%s"):format(sign, significand:sub(1, 8), exponent))
+end