Working on a little particle system for a game. Would there be interest if I built it out into a library?

SDK Development Discussion
8

seems to be a lot of vector maths (C add, mul) and table thrashing (C index)?

depends, but my understanding is that a sprite you tell it to draw at a float and it's different than the last float but still the same int, it will mark dirty. but if you told it to draw at an int last time and next time it's the same int, then it won't be marked dirty.

try this faster version

local floor <const> = math.floor
function Particle:update()
    self.lifetime+=dt
    self.position+=self.velocity*dt
    self.position.x = floor(self.position.x+.5)
    self.position.y = floor(self.position.y+.5)
end

and then this one

function Particle:update()
    self.lifetime+=dt
    self.position+=self.velocity*dt
    self.position.x = (self.position.x+.5)//1
    self.position.y = (self.position.y+.5)//1
end

not sure about this

function Particle:update()
    self.lifetime+=dt
    self.position+=self.velocity*dt
    self:moveBy(0.5, 0.5)
end

or this
not sure about this

function Particle:update()
    self.lifetime+=dt
    self.position+=self.velocity*dt
    self:moveTo((self.position.x+.5)//1, (self.position.y+.5)//1)
end

please report your benchmarks!

also see my benchmark thread Well… I didn’t expect that! (Benchmarks & Optimisations)

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