Backport "slippery" feature from MT 5.0, replace builtin deprecated function calls, move eat sound in builtin

builtin/game/chatcommands.lua

@@ -343,7 +343,7 @@ core.register_chatcommand("teleport", {
 			end
 			teleportee = core.get_player_by_name(name)
 			if teleportee then
-				teleportee:setpos(p)
+				teleportee:set_pos(p)
 				return true, "Teleporting to "..core.pos_to_string(p)
 			end
 		end
@@ -356,12 +356,12 @@ core.register_chatcommand("teleport", {
 		if target_name then
 			local target = core.get_player_by_name(target_name)
 			if target then
-				p = target:getpos()
+				p = target:get_pos()
 			end
 		end
 		if teleportee and p then
 			p = find_free_position_near(p)
-			teleportee:setpos(p)
+			teleportee:set_pos(p)
 			return true, "Teleporting to " .. target_name
 					.. " at "..core.pos_to_string(p)
 		end
@@ -380,7 +380,7 @@ core.register_chatcommand("teleport", {
 			teleportee = core.get_player_by_name(teleportee_name)
 		end
 		if teleportee and p.x and p.y and p.z then
-			teleportee:setpos(p)
+			teleportee:set_pos(p)
 			return true, "Teleporting " .. teleportee_name
 					.. " to " .. core.pos_to_string(p)
 		end
@@ -396,12 +396,12 @@ core.register_chatcommand("teleport", {
 		if target_name then
 			local target = core.get_player_by_name(target_name)
 			if target then
-				p = target:getpos()
+				p = target:get_pos()
 			end
 		end
 		if teleportee and p then
 			p = find_free_position_near(p)
-			teleportee:setpos(p)
+			teleportee:set_pos(p)
 			return true, "Teleporting " .. teleportee_name
 					.. " to " .. target_name
 					.. " at " .. core.pos_to_string(p)
@@ -619,7 +619,7 @@ core.register_chatcommand("spawnentity", {
 			return false, "Unable to spawn entity, player is nil"
 		end
 		if p == "" then
-			p = player:getpos()
+			p = player:get_pos()
 		else
 			p = core.string_to_pos(p)
 			if p == nil then
@@ -1003,7 +1003,7 @@ minetest.register_chatcommand("spawn", {
 			return false, "Player not found"
 		end
 		if spawn_spawnpos then
-			player:setpos(spawn_spawnpos)
+			player:set_pos(spawn_spawnpos)
 			return true, "Teleporting to spawn..."
 		else
 			return false, "The spawn point is not set!"
@@ -1020,7 +1020,7 @@ minetest.register_chatcommand("setspawn", {
 		if not player then
 			return false, "Player not found"
 		end
-		local pos = player:getpos()
+		local pos = player:get_pos()
 		local x = pos.x
 		local y = pos.y
 		local z = pos.z

builtin/game/falling.lua

@@ -52,12 +52,12 @@ core.register_entity(":__builtin:falling_node", {
 
 	on_step = function(self, dtime)
 		-- Set gravity
-		local acceleration = self.object:getacceleration()
-		if not vector.equals(acceleration, {x = 0, y = -10, z = 0}) then
-			self.object:setacceleration({x = 0, y = -10, z = 0})
+		local acceleration = self.object:get_acceleration()
+		if not vector.equals(acceleration, {x = 0, y = -9.81, z = 0}) then
+			self.object:setacceleration({x = 0, y = -9.81, z = 0})
 		end
 		-- Turn to actual node when colliding with ground, or continue to move
-		local pos = self.object:getpos()
+		local pos = self.object:get_pos()
 		-- Position of bottom center point
 		local bcp = {x = pos.x, y = pos.y - 0.7, z = pos.z}
 		-- 'bcn' is nil for unloaded nodes
@@ -120,10 +120,10 @@ core.register_entity(":__builtin:falling_node", {
 			core.check_for_falling(np)
 			return
 		end
-		local vel = self.object:getvelocity()
+		local vel = self.object:get_velocity()
 		if vector.equals(vel, {x = 0, y = 0, z = 0}) then
-			local npos = self.object:getpos()
-			self.object:setpos(vector.round(npos))
+			local npos = self.object:get_pos()
+			self.object:set_pos(vector.round(npos))
 		end
 	end
 })

builtin/game/item.lua

@@ -33,7 +33,7 @@ function core.get_pointed_thing_position(pointed_thing, above)
 		-- The position where a node would be dug
 		return pointed_thing.under
 	elseif pointed_thing.type == "object" then
-		return pointed_thing.ref and pointed_thing.ref:getpos()
+		return pointed_thing.ref and pointed_thing.ref:get_pos()
 	end
 end
 
@@ -331,7 +331,7 @@ function core.item_place_node(itemstack, placer, pointed_thing, param2,
 	-- Calculate the direction for furnaces and chests and stuff
 	elseif (def.paramtype2 == "facedir" or
 			def.paramtype2 == "colorfacedir") and not param2 then
-		local placer_pos = placer and placer:getpos()
+		local placer_pos = placer and placer:get_pos()
 		if placer_pos then
 			local dir = {
 				x = above.x - placer_pos.x,
@@ -488,7 +488,7 @@ function core.do_item_eat(hp_change, replace_with_item, itemstack, user, pointed
 				if inv and inv:room_for_item("main", {name=replace_with_item}) then
 					inv:add_item("main", replace_with_item)
 				else
-					local pos = user:getpos()
+					local pos = user:get_pos()
 					pos.y = math.floor(pos.y + 0.5)
 					core.add_item(pos, replace_with_item)
 				end
@@ -501,10 +501,11 @@ end
 function core.item_eat(hp_change, replace_with_item)
 	return function(itemstack, user, pointed_thing)  -- closure
 		if user then
-			local pos = user:getpos()
+			local pos = user:get_pos()
 			pos.y = pos.y + 1.5
 			local itemname = itemstack:get_name()
 			local texture = minetest.registered_items[itemname].inventory_image
+			minetest.sound_play("player_eat", {pos = pos, max_hear_distance = 10, gain = 0.3})
 			minetest.add_particlespawner({
 				amount = 20,
 				time = 0.1,

builtin/game/item_entity.lua

@@ -99,8 +99,8 @@ core.register_entity(":__builtin:item", {
 			self.itemstring = staticdata
 		end
 		self.object:set_armor_groups({immortal = 1})
-		self.object:setvelocity({x = 0, y = 2, z = 0})
-		self.object:setacceleration({x = 0, y = -10, z = 0})
+		self.object:set_velocity({x = 0, y = 2, z = 0})
+		self.object:set_acceleration({x = 0, y = -9.81, z = 0})
 		self:set_item(self.itemstring)
 	end,
 
@@ -125,7 +125,7 @@ core.register_entity(":__builtin:item", {
 				self.itemstring = ''
 				stack:set_count(count)
 			end
-			local pos = object:getpos()
+			local pos = object:get_pos()
 			pos.y = pos.y + (count - stack:get_count()) / max_count * 0.15
 			object:moveto(pos, false)
 			local s, c
@@ -171,7 +171,7 @@ core.register_entity(":__builtin:item", {
 			self.object:remove()
 			return
 		end
-		local p = self.object:getpos()
+		local p = self.object:get_pos()
 		p.y = p.y - 0.5
 		local node = core.get_node_or_nil(p)
 		-- Delete in 'ignore' nodes
@@ -183,9 +183,10 @@ core.register_entity(":__builtin:item", {
 
 		-- If node is nil (unloaded area), or node is not registered, or node is
 		-- walkably solid and item is resting on nodebox
-		local v = self.object:getvelocity()
-		if not node or not core.registered_nodes[node.name] or
-				core.registered_nodes[node.name].walkable and v.y == 0 then
+		local nn = node.name
+		local v = self.object:get_velocity()
+		if not core.registered_nodes[nn] or (core.registered_nodes[nn].walkable and
+				core.get_item_group(nn, "slippery") == 0) and v.y == 0 then
 			if self.physical_state then
 				local own_stack = ItemStack(self.object:get_luaentity().itemstring)
 				-- Merge with close entities of the same item
@@ -198,17 +199,28 @@ core.register_entity(":__builtin:item", {
 						end
 					end
 				end
-				self.object:setvelocity({x = 0, y = 0, z = 0})
-				self.object:setacceleration({x = 0, y = 0, z = 0})
+				self.object:set_velocity({x = 0, y = 0, z = 0})
+				self.object:set_acceleration({x = 0, y = 0, z = 0})
 				self.physical_state = false
 				self.object:set_properties({physical = false})
 			end
 		else
 			if not self.physical_state then
-				self.object:setvelocity({x = 0, y = 0, z = 0})
-				self.object:setacceleration({x = 0, y = -10, z = 0})
+				self.object:set_velocity({x = 0, y = 0, z = 0})
+				self.object:set_acceleration({x = 0, y = -9.81, z = 0})
 				self.physical_state = true
 				self.object:set_properties({physical = true})
+			elseif minetest.get_item_group(nn, "slippery") ~= 0 then
+				if math.abs(v.x) < 0.2 and math.abs(v.z) < 0.2 then
+					self.object:set_velocity({x = 0, y = 0, z = 0})
+					self.object:set_acceleration({x = 0, y = 0, z = 0})
+					self.physical_state = false
+					self.object:set_properties({
+						physical = false
+					})
+				else
+					self.object:set_acceleration({x = -v.x, y = -9.81, z = -v.z})
+				end
 			end
 		end
 		

builtin/game/misc.lua

@@ -91,7 +91,7 @@ function core.get_player_radius_area(player_name, radius)
 		return nil
 	end
 
-	local p1 = player:getpos()
+	local p1 = player:get_pos()
 	local p2 = p1
 
 	if radius then

builtin/game/static_spawn.lua

@@ -17,7 +17,7 @@ local function put_player_in_spawn(player_obj)
 	end
 	core.log("action", "Moving " .. player_obj:get_player_name() ..
 		" to static spawnpoint at " .. core.pos_to_string(static_spawnpoint))
-	player_obj:setpos(static_spawnpoint)
+	player_obj:set_pos(static_spawnpoint)
 	return true
 end
 

doc/lua_api.txt

@@ -1515,6 +1515,8 @@ Another example: Make red wool from white wool and red dye:
 * `soil`: saplings will grow on nodes in this group
 * `connect_to_raillike`: makes nodes of raillike drawtype with same group value
   connect to each other
+* `slippery`: Players and items will slide on the node.
+  Only use `slippery = 3` for now to ensure forwards compatibility.
 
 ### Known damage and digging time defining groups
 * `crumbly`: dirt, sand

src/client.cpp

@@ -424,7 +424,7 @@ void Client::step(float dtime)
 	// Control local player (0ms)
 	LocalPlayer *player = m_env.getLocalPlayer();
 	assert(player != NULL);
-	player->applyControl(dtime);
+	player->applyControl(dtime, &m_env);
 
 	// Step environment
 	m_env.step(dtime);

src/game.cpp

@@ -4485,7 +4485,7 @@ void Game::updateGui(const RunStats &stats, f32 dtime, const CameraOrientation &
 		s32 status_width  = guitext_status->getTextWidth();
 		s32 status_height = guitext_status->getTextHeight();
 #if defined(__ANDROID__) || defined(__IOS__)
-		s32 status_y = screensize.Y - 320 * g_settings->getFloat("hud_scaling");
+		s32 status_y = screensize.Y - 250 * g_settings->getFloat("hud_scaling");
 #else
 		s32 status_y = screensize.Y - 150;
 #endif

src/localplayer.cpp

@@ -518,7 +518,7 @@ void LocalPlayer::move(f32 dtime, Environment *env, f32 pos_max_d)
 	move(dtime, env, pos_max_d, NULL);
 }
 
-void LocalPlayer::applyControl(float dtime)
+void LocalPlayer::applyControl(float dtime, ClientEnvironment *env)
 {
 	// Clear stuff
 	swimming_vertical = false;
@@ -734,8 +734,13 @@ void LocalPlayer::applyControl(float dtime)
 	else
 		incH = incV = movement_acceleration_default * BS * dtime;
 
+	float slip_factor = 1.0f;
+	if (!free_move && !in_liquid && !in_liquid_stable)
+		slip_factor = getSlipFactor(env, speedH);
+
 	// Accelerate to target speed with maximum increment
-	accelerateHorizontal(speedH * physics_override_speed, incH * physics_override_speed);
+	accelerateHorizontal(speedH * physics_override_speed,
+			incH * physics_override_speed * slip_factor);
 	accelerateVertical(speedV * physics_override_speed, incV * physics_override_speed);
 }
 
@@ -770,7 +775,8 @@ v3f LocalPlayer::getEyeOffset() const
 }
 
 // Horizontal acceleration (X and Z), Y direction is ignored
-void LocalPlayer::accelerateHorizontal(const v3f &target_speed, const f32 max_increase)
+void LocalPlayer::accelerateHorizontal(const v3f &target_speed,
+		const f32 max_increase)
 {
         if (max_increase == 0)
                 return;
@@ -1102,3 +1108,24 @@ void LocalPlayer::old_move(f32 dtime, Environment *env, f32 pos_max_d,
 		m_can_jump = false;
 	}
 }
+
+float LocalPlayer::getSlipFactor(Environment *env, const v3f &speedH)
+{
+
+	// Slip on slippery nodes
+	const INodeDefManager *nodemgr = env->getGameDef()->ndef();
+	Map *map = &env->getMap();
+	const ContentFeatures &f = nodemgr->get(map->getNodeNoEx(
+			getStandingNodePos()));
+	int slippery = 0;
+	if (f.walkable)
+		slippery = itemgroup_get(f.groups, "slippery");
+
+	if (slippery >= 1) {
+		if (speedH == v3f(0.0f)) {
+			slippery = slippery * 2;
+		}
+		return core::clamp(1.0f / (slippery + 1), 0.001f, 1.0f);
+	}
+	return 1.0f;
+}

src/localplayer.h

@@ -29,6 +29,7 @@ class Client;
 class Environment;
 class GenericCAO;
 class ClientActiveObject;
+class ClientEnvironment;
 class IGameDef;
 
 enum LocalPlayerAnimations
@@ -78,7 +79,7 @@ public:
 	void old_move(f32 dtime, Environment *env, f32 pos_max_d,
 			std::vector<CollisionInfo> *collision_info);
 
-	void applyControl(float dtime);
+	void applyControl(float dtime, ClientEnvironment *env);
 
 	v3s16 getStandingNodePos();
 	v3s16 getFootstepNodePos();
@@ -144,6 +145,7 @@ private:
 	void accelerateHorizontal(const v3f &target_speed, const f32 max_increase);
 	void accelerateVertical(const v3f &target_speed, const f32 max_increase);
 	bool updateSneakNode(Map *map, const v3f &position, const v3f &sneak_max);
+	float getSlipFactor(Environment *env, const v3f &speedH);
 
 	v3f m_position;
 	v3s16 m_standing_node;

src/script/cpp_api/s_security.cpp

@@ -222,6 +222,7 @@ void ScriptApiSecurity::initializeSecurityClient()
 		"core",
 		"collectgarbage",
 		"DIR_DELIM",
+		"PLATFORM",
 		"error",
 		"getfenv",
 		"ipairs",