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authorY. Wang <y5nw@protonmail.com>2024-09-13 11:17:36 +0000
committergpcf <gpcf@gpcf.eu>2024-09-13 19:56:40 +0200
commit9ada994d5b3bd874e537b0bc9641b925058bdf51 (patch)
tree8ac018ff026cd0623c79ab43d3efb4ad36e69054 /textures_old/track_swr_cr_45.png
parent882108e8bf714200348bed2bd79b7f01ab6ffe7f (diff)
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Avoid unnecessarily updating the driver HUD
This patch avoids sending the driver HUD if it contains the same text that was previously sent.
Diffstat (limited to 'textures_old/track_swr_cr_45.png')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-12 05:23:27 +0000
id='n119' href='#n119'>119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 
--nodedb.lua
--database of all nodes that have 'save_in_nodedb' field set to true in node definition



--serialization format:
--(6byte poshash) (2byte contentid)
--contentid := (14bit nodeid, 2bit param2)

local function hash_to_bytes(x)
	local aH = math.floor(x / 1099511627776) % 256;
	local aL = math.floor(x /    4294967296) % 256;
	local bH = math.floor(x /      16777216) % 256;
	local bL = math.floor(x /         65536) % 256;
	local cH = math.floor(x /           256) % 256;
	local cL = math.floor(x                ) % 256;
	return(string.char(aH, aL, bH, bL, cH, cL));
end
local function cid_to_bytes(x)
	local cH = math.floor(x /           256) % 256;
	local cL = math.floor(x                ) % 256;
	return(string.char(cH, cL));
end
local function bytes_to_hash(bytes)
	local t={string.byte(bytes,1,-1)}
	local n = 
		t[1] * 1099511627776 +
		t[2] *    4294967296 +
		t[3] *      16777216 +
		t[4] *         65536 +
		t[5] *           256 +
		t[6]
    return n
end
local function bytes_to_cid(bytes)
	local t={string.byte(bytes,1,-1)}
	local n = 
		t[1] *           256 +
		t[2]
    return n
end
local function l2b(x)
	return x%4
end
local function u14b(x)
	return math.floor(x/4)
end
local ndb={}

--local variables for performance
local ndb_nodeids={}
local ndb_nodes={}

--load
--nodeids get loaded by advtrains init.lua and passed here
function ndb.load_data(data)
	ndb_nodeids = data and data.nodeids or {}
end

local path=minetest.get_worldpath().."/advtrains_ndb"

local file, err = io.open(path, "r")
if not file then
	atprint("load ndb failed: ", err or "Unknown Error")
else
	local cnt=0
	local hst=file:read(6)
	local cid=file:read(2)
	while hst and #hst==6 and cid and #cid==2 do
		ndb_nodes[bytes_to_hash(hst)]=bytes_to_cid(cid)
		cnt=cnt+1
		hst=file:read(6)
		cid=file:read(2)
	end
	atprint("nodedb: read", cnt, "nodes.")
	file:close()
end

--save
function ndb.save_data()
	local file, err = io.open(path, "w")
	if not file then
		atprint("load ndb failed: ", err or "Unknown Error")
	else
		for hash, cid in pairs(ndb_nodes) do
			file:write(hash_to_bytes(hash))