mirror of
https://github.com/DrBeef/Raze.git
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56 lines
1 KiB
Lua
56 lines
1 KiB
Lua
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local ffi = require "ffi"
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local math = require "math"
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local os = require "os"
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local xmath = require "xmath"
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local ldist = xmath.ldist
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local sqrt = math.sqrt
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local function printf(fmt, ...)
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print(string.format(fmt, ...))
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end
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local function edist(p1, p2)
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return sqrt(p1.x*p1.x + p2.x*p2.x)
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end
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local vec2 = ffi.typeof("struct { int32_t x, y; }")
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local numpoints = 1e4
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local Nsq = numpoints*numpoints
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printf("number of points: %d, testing %d distances", numpoints, Nsq)
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local B = 8192
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local pts = {}
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for i=1,numpoints do
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pts[i] = vec2(math.random(-B, B), math.random(B, -B))
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end
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-- test edist
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local t = os.clock()
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local sum = 0
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for i=1,numpoints do
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for j=1,numpoints do
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sum = sum+edist(pts[i], pts[j])
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end
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end
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t = os.clock()-t
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printf("edist: %.03fns per call, mean=%.03f", (1e9*t)/Nsq, sum/Nsq)
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-- test ldist
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t = os.clock()
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local sum = 0
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for i=1,numpoints do
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for j=1,numpoints do
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sum = sum+ldist(pts[i], pts[j])
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end
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end
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t = os.clock()-t
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printf("ldist: %.03fns per call, mean=%.03f", (1e9*t)/Nsq, sum/Nsq)
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