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119 lines
3.5 KiB
Lua
119 lines
3.5 KiB
Lua
-- Random walker as updatesector() timing test, for Lunatic-m32
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-- Load with: lua "require 'randwalk'"
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local ffi = require "ffi"
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local ffiC = ffi.C
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local xmath = require "xmath"
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local stat = require "stat"
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-- set to nil to disable saving positions
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g_posns = {}
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local USF_BREADTH = sector.UPDATE_FLAGS.BREADTH
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local function updatesectorbreadth(pos, sectnum)
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return updatesector(pos, sectnum, USF_BREADTH)
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end
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-- [STATS, TIMES] = RANDWALK(N, SPRITENUM, MINLEN, MAXLEN [, RANDOFS [, FUNCI [, LOGFN]]])
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function randwalk(N, spritenum, minlen, maxlen, randofs, funci, logfn)
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-- Set the random seed to an arbitrary but fixed value so that the "random" walk
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-- is deterministically reproducible for particular arguments.
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math.randomseed(834572183572)
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randofs = randofs or 0
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for i=1,randofs do
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math.random()
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end
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local funcnames = { "updatesector", "updatesectorbreadth", "updatesectorz" }
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local funcs = { updatesector, updatesectorbreadth, updatesectorz }
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local updatesectorfunc = funcs[funci]
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-- stats
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local st = { all=stat.new(), succ=stat.new(), fail=stat.new() }
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local times = {}
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local successp = {}
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local pos = xmath.vec3(sprite[spritenum])
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local sectnum = sprite[spritenum].sectnum
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for i=1,N do
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--[[
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-- get random integers for the displacement
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local ax,ay,az = math.random(minlen,maxlen), math.random(minlen,maxlen), math.random(minlen,maxlen)
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-- random signs
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local sx,sy,sz = math.random(0,1), math.random(0,1), math.random(0,1)
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sx, sy, sz = 2*sx-1, 2*sy-1, 2*sz-1 -- {0,1} -> {-1,1}
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ax, ay, az = sx*ax, sy*ay, sz*az
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--]]
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---[[
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local ang = 2*math.pi*math.random()
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local len = math.random(minlen, maxlen)
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local ax, ay, az = len*math.cos(ang), len*math.sin(ang), 0
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--]]
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local newpos = pos + xmath.ivec3(ax,ay,az)
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local t = ffiC.gethiticks()
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local newsect = updatesectorfunc(newpos, sectnum)
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t = ffiC.gethiticks()-t
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st.all:add(t)
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times[i] = t
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successp[i] = (newsect >= 0)
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if (newsect >= 0) then
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st.succ:add(t)
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pos = newpos
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sectnum = newsect
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else
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st.fail:add(t)
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end
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if (g_posns ~= nil) then
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g_posns[i] = pos
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end
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end
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local stallres = st.all:getstats()
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print("====================")
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printf("Random %s walk starting with sprite %d",
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funcnames[funci], spritenum)
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printf("Hop length: [%d .. %d], RNG offset: %d, %s",
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minlen, maxlen, randofs, logfn)
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printf("-- Times [ms] (total=%f)", N*stallres.mean)
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print("All: ".. tostring(stallres))
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print("Succeeded: ".. st.succ:getstatstr())
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print("Failed: ".. st.fail:getstatstr())
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if (logfn ~= nil) then
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local logfile, errmsg = io.open(logfn, "w")
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if (logfile == nil) then
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printf("Couldn't open log file \"%s\" for writing: %s",
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logfn, errmsg)
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else
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logfile:write(" \t \t \t\t\n")
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for i=1,N do
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if (g_posns ~= nil) then
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logfile:write(string.format("%s %d %d %d %d\n",
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tostring(times[i]), successp[i] and 1 or 0,
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g_posns[i].x, g_posns[i].y, g_posns[i].z))
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else
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logfile:write(string.format("%s %d\n", tostring(times[i]), successp[i] and 1 or 0))
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end
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end
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logfile:close()
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end
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end
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return st, ts
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end
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