minetest.git - modified minetest for gpcfs purposes

path: root/src/jthread/pthread/jmutex.cpp

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-- lzb.lua
-- Enforced and/or automatic train override control, obeying signals

--[[
Documentation of train.lzb table
train.lzb = {
	trav = Current index that the traverser has advanced so far
	travsht = boolean indicating whether the train will be a shunt move at "trav"
	travspd = speed restriction at end of traverser
	travwspd = warning speed res.
	oncoming = table containing oncoming signals, in order of appearance on the path
		{
			pos = position of the signal (not the IP!)
			idx = where this is on the path
			spd = speed allowed to pass (determined dynamically)
		}
}
each step, for every item in "oncoming", we need to determine the location to start braking (+ some safety margin)
and, if we passed this point for at least one of the items, initiate brake.
When speed has dropped below, say 3, decrease the margin to zero, so that trains actually stop at the signal IP.
The spd variable and travsht need to be updated on every aspect change. it's probably best to reset everything when any aspect changes

The traverser stops at signals that result in spd==0, because changes beyond there are likely.
]]

local il = advtrains.interlocking

local BRAKE_SPACE = 10
local AWARE_ZONE  = 50

local ADD_STAND  =  2
local ADD_SLOW   =  1
local ADD_FAST   =  10

local SHUNT_SPEED_MAX = 4

local function look_ahead(id, train)
	
	local acc = advtrains.get_acceleration(train, 1)
	local vel = train.velocity
	local brakedst = -(vel*vel) / (2*acc)


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