Initial commit, made TNT multiplayer-safe.

19 files changed, 601 insertions, 0 deletions

diff --git a/depends.txt b/depends.txt
new file mode 100644
index 0000000..4ad96d5
--- /dev/null
+++ b/depends.txt
@@ -0,0 +1 @@
+default
diff --git a/init.lua b/init.lua
new file mode 100644
index 0000000..fdabdf2
--- /dev/null
+++ b/init.lua
@@ -0,0 +1,600 @@
+tnt = {}
+-- Default to enabled in singleplayer and disabled in multiplayer
+local singleplayer = minetest.is_singleplayer()
+local setting = minetest.setting_getbool("enable_tnt")
+setting = true -- this mod is multiplayer-safe, so enable it.
+if (not singleplayer and setting ~= true) or
+		(singleplayer and setting == false) then
+	return
+end
+
+-- loss probabilities array (one in X will be lost)
+local loss_prob = {}
+
+loss_prob["default:cobble"] = 3
+loss_prob["default:dirt"] = 4
+
+local radius = tonumber(minetest.setting_get("tnt_radius") or 3)
+
+-- Fill a list with data for content IDs, after all nodes are registered
+local cid_data = {}
+minetest.after(0, function()
+	for name, def in pairs(minetest.registered_nodes) do
+		cid_data[minetest.get_content_id(name)] = {
+			name = name,
+			drops = def.drops,
+			flammable = def.groups.flammable,
+			on_blast = def.on_blast,
+		}
+	end
+end)
+
+local function rand_pos(center, pos, radius)
+	local def
+	local reg_nodes = minetest.registered_nodes
+	local i = 0
+	repeat
+		-- Give up and use the center if this takes too long
+		if i > 4 then
+			pos.x, pos.z = center.x, center.z
+			break
+		end
+		pos.x = center.x + math.random(-radius, radius)
+		pos.z = center.z + math.random(-radius, radius)
+		def = reg_nodes[minetest.get_node(pos).name]
+		i = i + 1
+	until def and not def.walkable
+end
+
+local function eject_drops(drops, pos, radius)
+	local drop_pos = vector.new(pos)
+	for _, item in pairs(drops) do
+		local count = item:get_count()
+		while count > 0 do
+			local take = math.max(1,math.min(radius * radius,
+					count,
+					item:get_stack_max()))
+			rand_pos(pos, drop_pos, radius)
+			local dropitem = ItemStack(item)
+			dropitem:set_count(take)
+			local obj = minetest.add_item(drop_pos, dropitem)
+			if obj then
+				obj:get_luaentity().collect = true
+				obj:setacceleration({x = 0, y = -10, z = 0})
+				obj:setvelocity({x = math.random(-3, 3),
+						y = math.random(0, 10),
+						z = math.random(-3, 3)})
+			end
+			count = count - take
+		end
+	end
+end
+
+local function add_drop(drops, item)
+	item = ItemStack(item)
+	local name = item:get_name()
+	if loss_prob[name] ~= nil and math.random(1, loss_prob[name]) == 1 then
+		return
+	end
+
+	local drop = drops[name]
+	if drop == nil then
+		drops[name] = item
+	else
+		drop:set_count(drop:get_count() + item:get_count())
+	end
+end
+
+
+local function destroy(drops, npos, cid, c_air, c_fire, on_blast_queue, ignore_protection, ignore_on_blast)
+	if not ignore_protection and minetest.is_protected(npos, "") then
+		return cid
+	end
+
+	local def = cid_data[cid]
+
+	if not def then
+		return c_air
+	elseif not ignore_on_blast and def.on_blast then
+		on_blast_queue[#on_blast_queue + 1] = {pos = vector.new(npos), on_blast = def.on_blast}
+		return cid
+	elseif def.flammable then
+		return c_fire
+	else
+		local node_drops = minetest.get_node_drops(def.name, "")
+		for _, item in ipairs(node_drops) do
+			add_drop(drops, item)
+		end
+		return c_air
+	end
+end
+
+
+local function calc_velocity(pos1, pos2, old_vel, power)
+	-- Avoid errors caused by a vector of zero length
+	if vector.equals(pos1, pos2) then
+		return old_vel
+	end
+
+	local vel = vector.direction(pos1, pos2)
+	vel = vector.normalize(vel)
+	vel = vector.multiply(vel, power)
+
+	-- Divide by distance
+	local dist = vector.distance(pos1, pos2)
+	dist = math.max(dist, 1)
+	vel = vector.divide(vel, dist)
+
+	-- Add old velocity
+	vel = vector.add(vel, old_vel)
+
+	-- randomize it a bit
+	vel = vector.add(vel, {
+		x = math.random() - 0.5,
+		y = math.random() - 0.5,
+		z = math.random() - 0.5,
+	})
+
+	-- Limit to terminal velocity
+	dist = vector.length(vel)
+	if dist > 250 then
+		vel = vector.divide(vel, dist / 250)
+	end
+	return vel
+end
+
+local function entity_physics(pos, radius, drops)
+	local objs = minetest.get_objects_inside_radius(pos, radius)
+	for _, obj in pairs(objs) do
+		local obj_pos = obj:getpos()
+		local dist = math.max(1, vector.distance(pos, obj_pos))
+
+		local damage = (4 / dist) * radius
+		if obj:is_player() then
+			-- currently the engine has no method to set
+			-- player velocity. See #2960
+			-- instead, we knock the player back 1.0 node, and slightly upwards
+			local dir = vector.normalize(vector.subtract(obj_pos, pos))
+			local moveoff = vector.multiply(dir, dist + 1.0)
+			local newpos = vector.add(pos, moveoff)
+			local newpos = vector.add(newpos, {x = 0, y = 0.2, z = 0})
+			obj:setpos(newpos)
+
+			obj:set_hp(obj:get_hp() - damage)
+		else
+			local do_damage = true
+			local do_knockback = true
+			local entity_drops = {}
+			local luaobj = obj:get_luaentity()
+			local objdef = minetest.registered_entities[luaobj.name]
+
+			if objdef and objdef.on_blast then
+				do_damage, do_knockback, entity_drops = objdef.on_blast(luaobj, damage)
+			end
+
+			if do_knockback then
+				local obj_vel = obj:getvelocity()
+				obj:setvelocity(calc_velocity(pos, obj_pos,
+						obj_vel, radius * 10))
+			end
+			if do_damage then
+				if not obj:get_armor_groups().immortal then
+					obj:punch(obj, 1.0, {
+						full_punch_interval = 1.0,
+						damage_groups = {fleshy = damage},
+					}, nil)
+				end
+			end
+			for _, item in ipairs(entity_drops) do
+				add_drop(drops, item)
+			end
+		end
+	end
+end
+
+local function add_effects(pos, radius, drops)
+	minetest.add_particle({
+		pos = pos,
+		velocity = vector.new(),
+		acceleration = vector.new(),
+		expirationtime = 0.4,
+		size = radius * 10,
+		collisiondetection = false,
+		vertical = false,
+		texture = "tnt_boom.png",
+	})
+	minetest.add_particlespawner({
+		amount = 64,
+		time = 0.5,
+		minpos = vector.subtract(pos, radius / 2),
+		maxpos = vector.add(pos, radius / 2),
+		minvel = {x = -10, y = -10, z = -10},
+		maxvel = {x = 10, y = 10, z = 10},
+		minacc = vector.new(),
+		maxacc = vector.new(),
+		minexptime = 1,
+		maxexptime = 2.5,
+		minsize = radius * 3,
+		maxsize = radius * 5,
+		texture = "tnt_smoke.png",
+	})
+
+	-- we just dropped some items. Look at the items entities and pick
+	-- one of them to use as texture
+	local texture = "tnt_blast.png" --fallback texture
+	local most = 0
+	for name, stack in pairs(drops) do
+		local count = stack:get_count()
+		if count > most then
+			most = count
+			local def = minetest.registered_nodes[name]
+			if def and def.tiles and def.tiles[1] then
+				texture = def.tiles[1]
+			end
+		end
+	end
+
+	minetest.add_particlespawner({
+		amount = 64,
+		time = 0.1,
+		minpos = vector.subtract(pos, radius / 2),
+		maxpos = vector.add(pos, radius / 2),
+		minvel = {x = -3, y = 0, z = -3},
+		maxvel = {x = 3, y = 5,  z = 3},
+		minacc = {x = 0, y = -10, z = 0},
+		maxacc = {x = 0, y = -10, z = 0},
+		minexptime = 0.8,
+		maxexptime = 2.0,
+		minsize = radius * 0.66,
+		maxsize = radius * 2,
+		texture = texture,
+		collisiondetection = true,
+	})
+end
+
+function tnt.burn(pos)
+	local name = minetest.get_node(pos).name
+	local group = minetest.get_item_group(name, "tnt")
+	if group > 0 then
+		minetest.sound_play("tnt_ignite", {pos = pos})
+		minetest.set_node(pos, {name = name .. "_burning"})
+		minetest.get_node_timer(pos):start(1)
+	elseif name == "tnt:gunpowder" then
+		minetest.set_node(pos, {name = "tnt:gunpowder_burning"})
+	end
+end
+
+local function tnt_explode(pos, radius, ignore_protection, ignore_on_blast)
+        local pos = vector.round(pos)
+	-- scan for adjacent TNT nodes first, and enlarge the explosion
+	local vm1 = VoxelManip()
+	local p1 = vector.subtract(pos, 2)
+	local p2 = vector.add(pos, 2)
+	local minp, maxp = vm1:read_from_map(p1, p2)
+	local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
+	local data = vm1:get_data()
+	local count = 0
+	local c_tnt = minetest.get_content_id("tnt:tnt")
+	local c_tnt_burning = minetest.get_content_id("tnt:tnt_burning")
+	local c_tnt_boom = minetest.get_content_id("tnt:boom")
+	local c_air = minetest.get_content_id("air")
+
+	for z = pos.z - 2, pos.z + 2 do
+	for y = pos.y - 2, pos.y + 2 do
+		local vi = a:index(pos.x - 2, y, z)
+		for x = pos.x - 2, pos.x + 2 do
+			local cid = data[vi]
+			if cid == c_tnt or cid == c_tnt_boom or cid == c_tnt_burning then
+				count = count + 1
+				data[vi] = c_air
+			end
+			vi = vi + 1
+		end
+	end
+	end
+
+	vm1:set_data(data)
+	vm1:write_to_map()
+
+	-- recalculate new radius
+	radius = math.floor(radius * math.pow(count, 1/3))
+
+	-- perform the explosion
+	local vm = VoxelManip()
+	local pr = PseudoRandom(os.time())
+	local p1 = vector.subtract(pos, radius)
+	local p2 = vector.add(pos, radius)
+	local minp, maxp = vm:read_from_map(p1, p2)
+	local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
+	local data = vm:get_data()
+
+	local drops = {}
+	local on_blast_queue = {}
+
+	local c_fire = minetest.get_content_id("fire:basic_flame")
+	for z = -radius, radius do
+	for y = -radius, radius do
+	local vi = a:index(pos.x + (-radius), pos.y + y, pos.z + z)
+	for x = -radius, radius do
+		local r = vector.length(vector.new(x, y, z))
+		if (radius * radius) / (r * r) >= (pr:next(80, 125) / 100) then
+			local cid = data[vi]
+			local p = {x = pos.x + x, y = pos.y + y, z = pos.z + z}
+			if cid ~= c_air then
+				data[vi] = destroy(drops, p, cid, c_air, c_fire,
+					on_blast_queue, ignore_protection,
+					ignore_on_blast)
+			end
+		end
+		vi = vi + 1
+	end
+	end
+	end
+
+	vm:set_data(data)
+	vm:write_to_map()
+	vm:update_map()
+	vm:update_liquids()
+
+	-- call nodeupdate for everything within 1.5x blast radius
+	for z = -radius * 1.5, radius * 1.5 do
+	for x = -radius * 1.5, radius * 1.5 do
+	for y = -radius * 1.5, radius * 1.5 do
+		local s = vector.add(pos, {x = x, y = y, z = z})
+		local r = vector.distance(pos, s)
+		if r / radius < 1.4 then
+			nodeupdate(s)
+		end
+	end
+	end
+	end
+
+	for _, data in ipairs(on_blast_queue) do
+		local dist = math.max(1, vector.distance(data.pos, pos))
+		local intensity = (radius * radius) / (dist * dist)
+		local node_drops = data.on_blast(data.pos, intensity)
+		if node_drops then
+			for _, item in ipairs(node_drops) do
+				add_drop(drops, item)
+			end
+		end
+	end
+
+	return drops, radius
+end
+
+function tnt.boom(pos, def)
+        if pos.y > -100 then
+--	   minetest.chat_send_all("TNT can only explode when deeper than -100")
+	   minetest.set_node(pos, {name = "tnt:tnt"})
+	   return
+	end
+	minetest.sound_play("tnt_explode", {pos = pos, gain = 1.5, max_hear_distance = 2*64})
+	minetest.set_node(pos, {name = "tnt:boom"})
+	
+	local drops, radius = tnt_explode(pos, def.radius, def.ignore_protection,
+			def.ignore_on_blast)
+	-- append entity drops
+	local damage_radius = (radius / def.radius) * def.damage_radius
+	entity_physics(pos, damage_radius, drops)
+	if not def.disable_drops then
+		eject_drops(drops, pos, radius)
+	end
+	add_effects(pos, radius, drops)
+end
+
+minetest.register_node("tnt:boom", {
+	drawtype = "airlike",
+	light_source = default.LIGHT_MAX,
+	walkable = false,
+	drop = "",
+	groups = {dig_immediate = 3},
+	on_construct = function(pos)
+		minetest.get_node_timer(pos):start(0.4)
+	end,
+	on_timer = function(pos, elapsed)
+		minetest.remove_node(pos)
+	end,
+	-- unaffected by explosions
+	on_blast = function() end,
+})
+
+minetest.register_node("tnt:gunpowder", {
+	description = "Gun Powder",
+	drawtype = "raillike",
+	paramtype = "light",
+	is_ground_content = false,
+	sunlight_propagates = true,
+	walkable = false,
+	tiles = {"tnt_gunpowder_straight.png", "tnt_gunpowder_curved.png", "tnt_gunpowder_t_junction.png", "tnt_gunpowder_crossing.png"},
+	inventory_image = "tnt_gunpowder_inventory.png",
+	wield_image = "tnt_gunpowder_inventory.png",
+	selection_box = {
+		type = "fixed",
+		fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
+	},
+	groups = {dig_immediate = 2, attached_node = 1, connect_to_raillike = minetest.raillike_group("gunpowder")},
+	sounds = default.node_sound_leaves_defaults(),
+
+	on_punch = function(pos, node, puncher)
+		if puncher:get_wielded_item():get_name() == "default:torch" then
+			tnt.burn(pos)
+		end
+	end,
+	on_blast = function(pos, intensity)
+		tnt.burn(pos)
+	end,
+})
+
+minetest.register_node("tnt:gunpowder_burning", {
+	drawtype = "raillike",
+	paramtype = "light",
+	sunlight_propagates = true,
+	walkable = false,
+	light_source = 5,
+	tiles = {{
+		name = "tnt_gunpowder_burning_straight_animated.png",
+		animation = {
+			type = "vertical_frames",
+			aspect_w = 16,
+			aspect_h = 16,
+			length = 1,
+		}
+	},
+	{
+		name = "tnt_gunpowder_burning_curved_animated.png",
+		animation = {
+			type = "vertical_frames",
+			aspect_w = 16,
+			aspect_h = 16,
+			length = 1,
+		}
+	},
+	{
+		name = "tnt_gunpowder_burning_t_junction_animated.png",
+		animation = {
+			type = "vertical_frames",
+			aspect_w = 16,
+			aspect_h = 16,
+			length = 1,
+		}
+	},
+	{
+		name = "tnt_gunpowder_burning_crossing_animated.png",
+		animation = {
+			type = "vertical_frames",
+			aspect_w = 16,
+			aspect_h = 16,
+			length = 1,
+		}
+	}},
+	selection_box = {
+		type = "fixed",
+		fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
+	},
+	drop = "",
+	groups = {dig_immediate = 2, attached_node = 1, connect_to_raillike = minetest.raillike_group("gunpowder")},
+	sounds = default.node_sound_leaves_defaults(),
+	on_timer = function(pos, elapsed)
+		for dx = -1, 1 do
+		for dz = -1, 1 do
+		for dy = -1, 1 do
+			if not (dx == 0 and dz == 0) then
+				tnt.burn({
+					x = pos.x + dx,
+					y = pos.y + dy,
+					z = pos.z + dz,
+				})
+			end
+		end
+		end
+		end
+		minetest.remove_node(pos)
+	end,
+	-- unaffected by explosions
+	on_blast = function() end,
+	on_construct = function(pos)
+		minetest.sound_play("tnt_gunpowder_burning", {pos = pos, gain = 2})
+		minetest.get_node_timer(pos):start(1)
+	end,
+})
+
+minetest.register_abm({
+	nodenames = {"group:tnt", "tnt:gunpowder"},
+	neighbors = {"fire:basic_flame", "default:lava_source", "default:lava_flowing"},
+	interval = 4,
+	chance = 1,
+	action = tnt.burn,
+})
+
+minetest.register_craft({
+	output = "tnt:gunpowder",
+	type = "shapeless",
+	recipe = {"default:coal_lump", "default:gravel"}
+})
+
+minetest.register_craft({
+	output = "tnt:tnt",
+	recipe = {
+		{"",           "group:wood",    ""},
+		{"group:wood", "tnt:gunpowder", "group:wood"},
+		{"",           "group:wood",    ""}
+	}
+})
+
+function tnt.register_tnt(def)
+	local name = ""
+	if not def.name:find(':') then
+		name = "tnt:" .. def.name
+	else
+		name = def.name
+		def.name = def.name:match(":([%w_]+)")
+	end
+	if not def.tiles then def.tiles = {} end
+	local tnt_top = def.tiles.top or def.name .. "_top.png"
+	local tnt_bottom = def.tiles.bottom or def.name .. "_bottom.png"
+	local tnt_side = def.tiles.side or def.name .. "_side.png"
+	local tnt_burning = def.tiles.burning or def.name .. "_top_burning_animated.png"
+	if not def.damage_radius then def.damage_radius = def.radius * 2 end
+
+	minetest.register_node(":" .. name, {
+		description = def.description,
+		tiles = {tnt_top, tnt_bottom, tnt_side},
+		is_ground_content = false,
+		groups = {dig_immediate = 2, mesecon = 2, tnt = 1},
+		sounds = default.node_sound_wood_defaults(),
+		on_punch = function(pos, node, puncher)
+			if puncher:get_wielded_item():get_name() == "default:torch" then
+				minetest.set_node(pos, {name = name .. "_burning"})
+			end
+		end,
+		on_blast = function(pos, intensity)
+			minetest.after(0.1, function()
+				tnt.boom(pos, def)
+			end)
+		end,
+		mesecons = {effector =
+			{action_on =
+				function(pos)
+					tnt.boom(pos, def)
+				end
+			}
+		},
+	})
+
+	minetest.register_node(":" .. name .. "_burning", {
+		tiles = {
+			{
+				name = tnt_burning,
+				animation = {
+					type = "vertical_frames",
+					aspect_w = 16,
+					aspect_h = 16,
+					length = 1,
+				}
+			},
+			tnt_bottom, tnt_side
+			},
+		light_source = 5,
+		drop = "",
+		sounds = default.node_sound_wood_defaults(),
+		groups = {falling_node = 1},
+		on_timer = function(pos, elapsed)
+			tnt.boom(pos, def)
+		end,
+		-- unaffected by explosions
+		on_blast = function() end,
+		on_construct = function(pos)
+			minetest.sound_play("tnt_ignite", {pos = pos})
+			minetest.get_node_timer(pos):start(4)
+			nodeupdate(pos)
+		end,
+	})
+end
+
+tnt.register_tnt({
+	name = "tnt:tnt",
+	description = "TNT",
+	radius = radius,
+})
+
diff --git a/textures/tnt_blast.png b/textures/tnt_blast.png
new file mode 100644
index 0000000..e90829a
--- /dev/null
+++ b/textures/tnt_blast.png
diff --git a/textures/tnt_boom.png b/textures/tnt_boom.png
new file mode 100644
index 0000000..c848bfc
--- /dev/null
+++ b/textures/tnt_boom.png
diff --git a/textures/tnt_bottom.png b/textures/tnt_bottom.png
new file mode 100644
index 0000000..95f66cb
--- /dev/null
+++ b/textures/tnt_bottom.png
diff --git a/textures/tnt_gunpowder_burning_crossing_animated.png b/textures/tnt_gunpowder_burning_crossing_animated.png
new file mode 100644
index 0000000..a901f7b
--- /dev/null
+++ b/textures/tnt_gunpowder_burning_crossing_animated.png
diff --git a/textures/tnt_gunpowder_burning_curved_animated.png b/textures/tnt_gunpowder_burning_curved_animated.png
new file mode 100644
index 0000000..bc01806
--- /dev/null
+++ b/textures/tnt_gunpowder_burning_curved_animated.png
diff --git a/textures/tnt_gunpowder_burning_straight_animated.png b/textures/tnt_gunpowder_burning_straight_animated.png
new file mode 100644
index 0000000..c860ace
--- /dev/null
+++ b/textures/tnt_gunpowder_burning_straight_animated.png
diff --git a/textures/tnt_gunpowder_burning_t_junction_animated.png b/textures/tnt_gunpowder_burning_t_junction_animated.png
new file mode 100644
index 0000000..a556072
--- /dev/null
+++ b/textures/tnt_gunpowder_burning_t_junction_animated.png
diff --git a/textures/tnt_gunpowder_crossing.png b/textures/tnt_gunpowder_crossing.png
new file mode 100644
index 0000000..916c84e
--- /dev/null
+++ b/textures/tnt_gunpowder_crossing.png
diff --git a/textures/tnt_gunpowder_curved.png b/textures/tnt_gunpowder_curved.png
new file mode 100644
index 0000000..cb8b4ea
--- /dev/null
+++ b/textures/tnt_gunpowder_curved.png
diff --git a/textures/tnt_gunpowder_inventory.png b/textures/tnt_gunpowder_inventory.png
new file mode 100644
index 0000000..105a2d2
--- /dev/null
+++ b/textures/tnt_gunpowder_inventory.png
diff --git a/textures/tnt_gunpowder_straight.png b/textures/tnt_gunpowder_straight.png
new file mode 100644
index 0000000..8ab0e3c
--- /dev/null
+++ b/textures/tnt_gunpowder_straight.png
diff --git a/textures/tnt_gunpowder_t_junction.png b/textures/tnt_gunpowder_t_junction.png
new file mode 100644
index 0000000..ac997a7
--- /dev/null
+++ b/textures/tnt_gunpowder_t_junction.png
diff --git a/textures/tnt_side.png b/textures/tnt_side.png
new file mode 100644
index 0000000..d303473
--- /dev/null
+++ b/textures/tnt_side.png
diff --git a/textures/tnt_smoke.png b/textures/tnt_smoke.png
new file mode 100644
index 0000000..488b50f
--- /dev/null
+++ b/textures/tnt_smoke.png
diff --git a/textures/tnt_top.png b/textures/tnt_top.png
new file mode 100644
index 0000000..31b807c
--- /dev/null
+++ b/textures/tnt_top.png
diff --git a/textures/tnt_top_burning.png b/textures/tnt_top_burning.png
new file mode 100644
index 0000000..fc0d490
--- /dev/null
+++ b/textures/tnt_top_burning.png
diff --git a/textures/tnt_top_burning_animated.png b/textures/tnt_top_burning_animated.png
new file mode 100644
index 0000000..18a270f
--- /dev/null
+++ b/textures/tnt_top_burning_animated.png