Add sniper_rifles mod (#453)

mods/pvp/sniper_rifles/init.lua

@@ -0,0 +1,104 @@
+------------------
+-- Private data --
+------------------
+
+-- Keep track of players who are scoping in, and their wielded item
+local scoped = {}
+
+-- Timer for scope-check globalstep
+local timer = 0.2
+
+-------------
+-- Helpers --
+-------------
+
+local function show_scope(name, item_name, fov_mult)
+	local player = minetest.get_player_by_name(name)
+	if not player then
+		return
+	end
+
+	scoped[name] = item_name
+	-- e.g. if fov_mult == 8, then FOV = 1/8 * current_FOV, a.k.a 8x zoom
+	player:set_fov(1 / fov_mult, true)
+	player:hud_set_flags({ wielditem = false })
+end
+
+local function hide_scope(name)
+	local player = minetest.get_player_by_name(name)
+	if not player then
+		return
+	end
+
+	scoped[name] = nil
+	player:set_fov(0)
+	player:hud_set_flags({ wielditem = true })
+end
+
+local function on_rclick(item, placer, pointed_thing)
+	if pointed_thing.type == "object" then
+		return
+	end
+
+	local name = placer:get_player_name()
+	if scoped[name] then
+		hide_scope(name)
+	else
+		-- Remove _loaded suffix added to item name by shooter
+		local item_name = item:get_name():gsub("_loaded", "")
+		local fov_mult = shooter.registered_weapons[item_name].fov_mult
+		show_scope(name, item_name, fov_mult)
+	end
+end
+
+------------------
+-- Sccope-check --
+------------------
+
+-- Hide scope if currently wielded item is not the same item
+-- player wielded when scoping
+
+local time = 0
+minetest.register_globalstep(function(dtime)
+	time = time + dtime
+	if time < timer then
+		return
+	end
+
+	time = 0
+	for name, original_item in pairs(scoped) do
+		local player = minetest.get_player_by_name(name)
+		if not player then
+			scoped[name] = nil
+		else
+			local wielded_item = player:get_wielded_item():get_name():gsub("_loaded", "")
+			if wielded_item ~= original_item then
+				hide_scope(name)
+			end
+		end
+	end
+end)
+
+----------------------------
+-- Rifle registration API --
+----------------------------
+
+sniper_rifles = {}
+
+function sniper_rifles.register_rifle(name, def)
+	assert(def.fov_mult, "Rifle definition must contain FOV multiplier (fov_mult)!")
+
+	shooter.register_weapon(name, def)
+
+	-- Manually add extra fields to itemdef that shooter doesn't allow
+	-- Also modify the _loaded variant
+	local overrides = {
+		on_secondary_use = on_rclick,
+		wield_scale = vector.new(2, 2, 1.5)
+	}
+	minetest.override_item(name, overrides)
+	minetest.override_item(name .. "_loaded", overrides)
+
+end
+
+dofile(minetest.get_modpath(minetest.get_current_modname()) .. "/rifles.lua")