Implement basic route signaling with Japanese signals for demo

2 files changed, 420 insertions, 0 deletions

diff --git a/advtrains_signals_japan/.gitignore b/advtrains_signals_japan/.gitignore
new file mode 100644
index 0000000..0969b6b
--- /dev/null
+++ b/advtrains_signals_japan/.gitignore
@@ -0,0 +1 @@
+models/*
diff --git a/advtrains_signals_japan/init.lua b/advtrains_signals_japan/init.lua
new file mode 100644
index 0000000..9ccf66b
--- /dev/null
+++ b/advtrains_signals_japan/init.lua
@@ -0,0 +1,419 @@
+local pole_texture = "advtrains_hud_bg.png^[colorize:#858585:255"
+local signal_face_texture = "advtrains_hud_bg.png^[colorize:#000000:255"
+local pole_radius = 1/16
+local pole_box = {-pole_radius,-1/2,-pole_radius,pole_radius,1/2,pole_radius}
+local light_radius = 1/20
+local signal_width = 6*light_radius
+local signal_thickness = pole_radius*3
+local signal_height = {}
+local signal_box = {}
+local light_red = "advtrains_hud_bg.png^[colorize:red:255"
+local light_yellow = "advtrains_hud_bg.png^[colorize:orange:255"
+local light_green = "advtrains_hud_bg.png^[colorize:lime:255"
+local light_purple = "advtrains_hud_bg.png^[colorize:purple:255"
+local light_distant = light_purple
+local light_off = signal_face_texture
+
+do
+	local model_path_prefix = table.concat({minetest.get_modpath("advtrains_signals_japan"), "models", "advtrains_signals_japan_"}, DIR_DELIM)
+
+	local function vertex(x, y, z)
+		return string.format("v %f %f %f", x, y, z)
+	end
+	local function texture(u, v)
+		return string.format("vt %f %f", u, v)
+	end
+	local function face_element(v, vt)
+		if vt then
+			return string.format("%d/%d", v, vt)
+		end
+		return tonumber(v)
+	end
+	local function face_elements(...)
+		local st = {"f"}
+		local args = {...}
+		local len = #args
+		for i = 1, len, 2 do
+			st[(i+3)/2] = face_element(args[i], args[i+1])
+		end
+		return table.concat(st, " ")
+	end
+	local function sequential_elements(v0, vt0, count)
+		local st = {}
+		for i = 1, count do
+			st[i] = face_element(v0+i, vt0+i)
+		end
+		return table.concat(st, " ")
+	end
+	local function mod_lower(min, a, b)
+		return min + (a-min)%b
+	end
+	local function connect_circular(v0, vt0, count)
+		return "f " .. sequential_elements(v0, vt0, count)
+	end
+	local function connect_cylindrical(v0, vt0, count)
+		local st = {}
+		for i = 0, count-1 do
+			local j = (i+1)%count
+			local v1 = v0+i+1
+			local v2 = v1+count
+			local v3 = v0+j+1
+			local v4 = v3+count
+			local vt1 = vt0+i+1
+			local vt2 = vt1+count+1
+			st[i+1] = face_elements(v1, vt1, v3, vt1+1, v4, vt2+1, v2, vt2)
+		end
+		return table.concat(st, "\n")
+	end
+	local function circular_textures(u0, v0, r, count, total, angular_offset, direction)
+		local st = {}
+		if not angular_offset then
+			angular_offset = 0
+		end
+		if not total then
+			total = count
+		end
+		if not direction then
+			direction = 1
+		end
+		for i = 0, count-1 do
+			local theta = angular_offset + direction*i/total*2*math.pi
+			local u, v = r*math.cos(theta), r*math.sin(theta)
+			st[i+1] = texture(u0+u, v0+v)
+		end
+		return table.concat(st, "\n")
+	end
+	local function rectangular_textures(u0, v0, u1, v1, count)
+		local st = {}
+		local width = u1-u0
+		for i = 0, count do
+			local u = u0+i/count*width
+			st[i+1] = texture(u, v0)
+			st[i+count+2] = texture(u, v1)
+		end
+		return table.concat(st, "\n")
+	end
+
+	-- generate pole model
+	local pole_npolygon = 32
+	local pole_vertex_count = pole_npolygon*2
+	local pole_uv_count = pole_npolygon*3+2
+	local pole_vertices = {}
+	local pole_objdef = {
+		"g pole",
+		"usemtl pole",
+		connect_circular(0, 0, pole_npolygon),
+		connect_circular(pole_npolygon, 0, pole_npolygon),
+		connect_cylindrical(0, pole_npolygon, pole_npolygon),
+	}
+	local pole_uv = {
+		circular_textures(0.5, 0.5, 0.5, pole_npolygon),
+		rectangular_textures(0, 0, 1, 1, pole_npolygon),
+	}
+	for i = 0, pole_npolygon-1 do
+		local theta = i*2/pole_npolygon*math.pi
+		local r = pole_radius
+		local x, z = r*math.sin(theta), r*math.cos(theta)
+		local lower_index = i+1
+		local upper_index = lower_index+pole_npolygon
+		pole_vertices[lower_index] = vertex(x, -0.5, z)
+		pole_vertices[upper_index] = vertex(x, 0.5, z)
+	end
+	pole_vertices = table.concat(pole_vertices, "\n")
+	pole_objdef = table.concat(pole_objdef, "\n")
+	pole_uv = table.concat(pole_uv, "\n")
+	minetest.safe_file_write(model_path_prefix .. "pole.obj", table.concat({pole_vertices, pole_uv, pole_objdef}, "\n"))
+
+	-- generate signals
+	for lightcount = 5, 6 do
+		for rotname, rot in pairs {["0"] = 0, ["30"] = 26.5, ["45"] = 45, ["60"] = 63.5} do
+			local rot = math.rad(rot)
+			local lightradius = 0.05
+			local lightspacing = 0.04
+			local halfwidth = signal_width/2
+			local halfheight = (2+lightcount)*lightradius+(lightcount-1)*lightspacing/2
+			local halfthickness = signal_thickness/2
+			local half_npolygon = pole_npolygon/2
+			local quarter_npolygon = pole_npolygon/4
+			local boxside = math.max(halfwidth, halfthickness*2)
+			signal_height[lightcount] = halfheight*2
+			signal_box[lightcount] = {-boxside, -halfheight, -boxside, boxside, halfheight, boxside}
+
+			local _vertex = vertex
+			local rv = vector.new(0, rot, 0)
+			local function vertex(x, y, z)
+				local v = vector.rotate(vector.new(x, y, z), rv)
+				return _vertex(v.x, v.y, v.z)
+			end
+
+			-- generate signal face
+			local face_vertices = {}
+			local face_uv = {
+				circular_textures(0.5, 0.5+halfheight-3*lightradius, halfwidth, half_npolygon+1, pole_npolygon),
+				circular_textures(0.5, 0.5-halfheight+3*lightradius, halfwidth, half_npolygon+1, pole_npolygon, math.pi),
+				rectangular_textures(0, 0, 1, 1, 2+pole_npolygon),
+			}
+			local face_objdef = {
+				"g face",
+				"usemtl face",
+				connect_circular(pole_vertex_count+2+pole_npolygon, pole_uv_count, 2+pole_npolygon),
+				connect_circular(pole_vertex_count, pole_uv_count, 2+pole_npolygon),
+				connect_cylindrical(pole_vertex_count, pole_uv_count+2+pole_npolygon, 2+pole_npolygon),
+			}
+			local face_vertex_count = 4*half_npolygon+4
+			local face_uv_count = 2*(half_npolygon+1) + 2*(pole_npolygon+3)
+			for i = 0, half_npolygon do
+				local theta = i/half_npolygon*math.pi
+				local r = halfwidth
+				local x, y = r*math.cos(theta), halfheight-3*lightradius+r*math.sin(theta)
+				face_vertices[i+1] = vertex(x, y, -halfthickness)
+				face_vertices[i+2+half_npolygon] = vertex(-x, -y, -halfthickness)
+				face_vertices[i+3+2*half_npolygon] = vertex(x, y, halfthickness)
+				face_vertices[i+4+3*half_npolygon] = vertex(-x, -y, halfthickness)
+			end
+
+			-- generate lights
+			local light_vertices = {}
+			local light_vertex_count = 8*(half_npolygon+1)+pole_npolygon
+			local light_uv = {rectangular_textures(0, 0, 1, 1, half_npolygon)}
+			local light_uv_count = 2*(half_npolygon+1)+pole_npolygon*lightcount
+			local light_objdef_face = {}
+			local light_objdef_main = {
+				"g light",
+				"usemtl light",
+			}
+			for i = 1, lightcount do
+				local x0, y0 = 0, -halfheight + (2*i+1)*lightradius + (i-1)*lightspacing
+				local v0 = light_vertex_count*(i-1)
+				for j = 0, half_npolygon do
+					local theta = j/half_npolygon*math.pi
+					local xs, ys = math.cos(theta), math.sin(theta)
+					for k, v in pairs {
+						{xm = -1, ym = 1, rm = 1, z = 1},
+						{xm = 1, ym = 1, rm = 0.8, z = 1},
+						{xm = -1, ym = 1, rm = 1, z = 2},
+						{xm = 1, ym = 1, rm = 0.8, z = 2},
+						{xm = 1, ym = -1, rm = 1, z = 1},
+						{xm = -1, ym = -1, rm = 0.8, z = 1},
+						{xm = 1, ym = -1, rm = 1, z = 1.5},
+						{xm = -1, ym = -1, rm = 0.8, z = 1.5},
+					} do
+						local x = x0+xs*lightradius*v.xm*v.rm
+						local y = y0+ys*lightradius*v.ym*v.rm
+						light_vertices[v0+(k-1)*(half_npolygon+1)+j+1] = vertex(x, y, -halfthickness*v.z)
+					end
+				end
+				for j = 0, pole_npolygon-1 do
+					local theta = j/pole_npolygon*2*math.pi
+					local x, y = math.cos(theta), math.sin(theta)
+					light_vertices[v0+8*(half_npolygon+1)+1+j] = vertex(x0+lightradius*x, y0+lightradius*y, -halfthickness*1.05)
+				end
+				local v0 = pole_vertex_count+face_vertex_count+v0
+				local vt0 = pole_uv_count + face_uv_count
+				local ostep = 2*half_npolygon+2
+				for j = 1, half_npolygon do
+					local dv = 2*(half_npolygon+1)
+					local v0 = v0 + dv
+					local vn = v0 + dv
+					light_objdef_face[i*ostep-j+1] = face_elements(v0+j, vt0+j, v0+j+1, vt0+j+1, vn-j, vt0+half_npolygon+2+j, vn-j+1, vt0+half_npolygon+1+j)
+					local v0 = vn + dv
+					local vn = v0 + dv
+					light_objdef_face[i*ostep-half_npolygon-j+1] = face_elements(v0+j, vt0+j, v0+j+1, vt0+j+1, vn-j, vt0+half_npolygon+2+j, vn-j+1, vt0+half_npolygon+1+j)
+				end
+				local vt0 = vt0 + 2*(half_npolygon+1) + (i-1)*pole_npolygon
+				light_uv[i+1] = circular_textures(0.5, (i-1/2)/lightcount, 0.4/lightcount, pole_npolygon)
+				light_objdef_face[(i-1)*ostep+1] = connect_cylindrical(v0, pole_uv_count+2+pole_npolygon, 2+pole_npolygon)
+				light_objdef_face[(i-1)*ostep+2] = connect_cylindrical(v0+4*(half_npolygon+1), pole_uv_count+2+pole_npolygon, 2+pole_npolygon)
+				light_objdef_main[2+i] = connect_circular(v0+8*(half_npolygon+1), vt0, pole_npolygon)
+			end
+
+			-- write file
+			face_vertices = table.concat(face_vertices, "\n")
+			face_uv = table.concat(face_uv, "\n")
+			face_objdef = table.concat(face_objdef, "\n")
+			minetest.safe_file_write(model_path_prefix .. lightcount .. "_" .. rotname .. ".obj", table.concat({
+				pole_vertices,
+				face_vertices,
+				table.concat(light_vertices, "\n"),
+				pole_uv,
+				face_uv,
+				table.concat(light_uv, "\n"),
+				pole_objdef,
+				face_objdef,
+				table.concat(light_objdef_face, "\n"),
+				table.concat(light_objdef_main, "\n"),
+			}, "\n"))
+		end
+	end
+end
+
+local S = attrans
+
+minetest.register_node("advtrains_signals_japan:pole_0", {
+	description = S("Japanese signal pole"),
+	drawtype = "mesh",
+	mesh = "advtrains_signals_japan_pole.obj",
+	tiles = {pole_texture},
+
+	paramtype = "light",
+	sunlight_propagates = true,
+
+	paramtype2 = "none",
+	selection_box = {
+		type = "fixed",
+		fixed = {pole_box},
+	},
+	collision_box = {
+		type = "fixed",
+		fixed = {pole_box},
+	},
+	groups = {
+		cracky = 2,
+		not_blocking_trains = 1,
+		not_in_creative_inventory = 0,
+	},
+	drop = "advtrains_signals_japan:pole_0",
+})
+
+local sigdefs = {}
+local lightcolors = {
+	red = "red",
+	green = "lime",
+	yellow = "orange",
+	distant = "purple",
+}
+local aspnames = {
+	danger = "Danger (halt)",
+	restrictedspeed = "Restricted speed",
+	caution = "Caution",
+	reducedspeed = "Reduced speed",
+	clear = "Clear (proceed)",
+}
+local function process_signal(name, sigdata, isrpt)
+	local typename = "advtrains_signals_japan:" .. name
+	local type2def = {}
+	type2def.name = typename
+	type2def.main = {}
+	local def = {}
+	local tx = {}
+	def.typename = typename
+	def.textures = tx
+	def.desc = sigdata.desc
+	def.isdst = isrpt
+	local lights = sigdata.lights
+	local lightcount = #lights
+	if isrpt then
+		lightcount = lightcount+1
+	end
+	def.lightcount = lightcount
+	for idx, asp in ipairs(sigdata.aspects) do
+		local aspname = asp.name
+		local tt = {
+			string.format("[combine:1x%d", lightcount),
+			string.format("0,0=(advtrains_hud_bg.png\\^[resize\\:1x%d\\^[colorize\\:#000)", lightcount),
+		}
+		for _, i in pairs(asp.lights) do
+			local color = lightcolors[lights[i]]
+			tt[#tt+1] = string.format("0,%d=(advtrains_hud_bg.png\\^[colorize\\:%s)", i-1, color)
+		end
+		if isrpt then
+			local color = lightcolors.distant
+			tt[#tt+1] = string.format("0,%d=(advtrains_hud_bg.png\\^[colorize\\:%s)", lightcount-1, color)
+		end
+		tx[aspname] = table.concat(tt, ":")
+		type2def.main[idx] = {name = asp.name, label = S(aspnames[asp.name]), main = asp.main or false}
+	end
+	local invimg = {
+		string.format("[combine:%dx%d", lightcount*4+1, lightcount*4+1),
+		string.format("%d,0=(advtrains_hud_bg.png\\^[resize\\:5x%d\\^[colorize\\:#000)", lightcount*2-2, lightcount*4+1),
+	}
+	for i, c in pairs(lights) do
+		local color = lightcolors[c]
+		invimg[i+2] = string.format("%d,%d=(advtrains_hud_bg.png\\^[resize\\:3x3\\^[colorize\\:%s)", 2*lightcount-1, 4*i-3, color)
+	end
+	if isrpt then
+		invimg[lightcount+2] = string.format("%d,%d=(advtrains_hud_bg.png\\^[resize\\:3x3\\^[colorize\\:%s)", 2*lightcount-1, 4*lightcount-3, lightcolors.distant)
+	end
+	def.inventory_image = table.concat(invimg, ":")
+	if not isrpt then
+		advtrains.interlocking.aspects.register_type2(type2def)
+	end
+	return def
+end
+for sigtype, sigdata in pairs {
+	["5a"] = {
+		desc = "5A",
+		lights = {"yellow", "yellow", "red", "yellow", "green"},
+		aspects = {
+			{name = "clear", lights = {5}, main = -1},
+			{name = "reducedspeed", lights = {2, 5}},
+			{name = "caution", lights = {4}},
+			{name = "restrictedspeed", lights = {1, 4}},
+			{name = "danger", lights = {3}, main = 0},
+		}
+	}
+} do
+	sigdefs["main_"..sigtype] = process_signal(sigtype, sigdata)
+	sigdefs["rpt_"..sigtype] = process_signal(sigtype, sigdata, true)
+end
+
+for k in pairs(sigdefs) do
+	advtrains.trackplacer.register_tracktype("advtrains_signals_japan:"..k)
+end
+
+for _, rtab in ipairs {
+	{rot = "0", ici = true},
+	{rot = "30"},
+	{rot = "45"},
+	{rot = "60"},
+} do
+	local rot = rtab.rot
+	for sigtype, siginfo in pairs(sigdefs) do
+		local lightcount = siginfo.lightcount
+		for asp, texture in pairs(siginfo.textures) do
+			minetest.register_node("advtrains_signals_japan:"..sigtype.."_"..asp.."_"..rot, {
+				description = attrans(string.format("Japanese%s signal (type %s)", siginfo.isdst and " repeating" or "", siginfo.desc)),
+				drawtype = "mesh",
+				mesh = string.format("advtrains_signals_japan_%d_%s.obj", lightcount, rot),
+				tiles = {pole_texture, signal_face_texture, texture},
+				paramtype = "light",
+				sunlight_propagates = true,
+				light_source = 4,
+				paramtype2 = "facedir",
+				selection_box = {
+					type = "fixed",
+					fixed = {pole_box, signal_box[lightcount]},
+				},
+				collision_box = {
+					type = "fixed",
+					fixed = {pole_box, signal_box[lightcount]},
+				},
+				groups = {
+					cracky = 2,
+					advtrains_signal = 2,
+					not_blocking_trains = 1,
+					save_in_at_nodedb = 1,
+					not_in_creative_inventory = rtab.ici and asp == "danger" and 0 or 1,
+				},
+				inventory_image = siginfo.inventory_image,
+				drop = "advtrains_signals_japan:"..sigtype.."_danger_0",
+				advtrains = {
+					supported_aspects = {
+						type = 2,
+						group = siginfo.typename,
+					},
+					get_aspect = function()
+						return asp
+					end,
+					set_aspect = function(pos, node, asp)
+						advtrains.ndb.swap_node(pos, {name = "advtrains_signals_japan:"..sigtype.."_"..asp.."_"..rot, param2 = node.param2})
+					end,
+				},
+				on_rightclick = advtrains.interlocking.signal_rc_handler,
+				can_dig = advtrains.interlocking.signal_can_dig,
+				after_dig_node = advtrains.interlocking.signal_after_dig,
+			})
+			advtrains.trackplacer.add_worked("advtrains_signals_japan:"..sigtype, asp, "_"..rot)
+		end
+	end
+end