getPSO and basic particle system templates usage

getPSO.lua

function getPSO(filename)
    local templates = loadstring("return " .. love.filesystem.read(filename))()
    local pss = {}
    local degToRad = function(d) return d*math.pi/180 end
    local getPS = function(template)
        local sprite = love.graphics.newImage('your_default_sprite_here.png') 
        local ps = love.graphics.newParticleSystem(sprite, template.buffer_size)
        ps:setBufferSize(template.buffer_size)
        local colors = {}
        for i = 1, 8 do
            if template.colors[i] then
                table.insert(colors, template.colors[i][1])
                table.insert(colors, template.colors[i][2])
                table.insert(colors, template.colors[i][3])
                table.insert(colors, template.colors[i][4])
            end
        end
        ps:setColors(unpack(colors))
        ps:setDirection(degToRad(template.direction))
        ps:setEmissionRate(template.emission_rate)
        ps:setGravity(template.gravity[1], template.gravity[2])
        ps:setLifetime(template.lifetime)
        ps:setOffset(template.offset[1], template.offset[2])
        ps:setParticleLife(template.particle_life[1], template.particle_life[2])
        ps:setRadialAcceleration(template.radial_acc[1], template.radial_acc[2])
        ps:setRotation(degToRad(template.rotation[1]), degToRad(template.rotation[2]))
        ps:setSizeVariation(template.size_variation)
        ps:setSizes(unpack(template.sizes))
        ps:setSpeed(template.speed[1], template.speed[2])
        ps:setSpin(degToRad(template.spin[1]), degToRad(template.spin[2]))
        ps:setSpinVariation(template.spin_variation)
        ps:setSpread(degToRad(template.spread))
        ps:setTangentialAcceleration(template.tangent_acc[1], template.tangent_acc[2])
        return ps
    end
    for _, t in pairs(templates) do
        if t then table.insert(pss, {name = t.name, ps = getPS(t.template)}) end
    end
    return pss 
end

function love.load()
   pss = getPSO("Example.pso")
   pss[1].ps:start()
end

function love.update(dt)
   pss[1].ps:update(dt) 
end

function love.draw()
   love.graphics.draw(pss[1].ps, 400, 300)
end