LÖVE

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local bullet = {}
function spawnBullet(x,y,angle,speed)
    table.insert(bullet, {x=x, y=y, m=speed, phi=angle})
end
function love.update(dt)
    -- iterate over bullet table and move stuff
end
function love.draw()
    -- iterate over bullet table, and draw stuff
end

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--[=======================================================================[--

Simple library to implement a function that allows causing two given fixtures
to not collide which each other.

Usage:

local world = love.physics.newWorld(...)
local ignoreCollision = require('stopCollision')(world)

...

ignoreCollision(fixture1, fixture2, true) -- add pair to ignore list
ignoreCollision(fixture1, fixture2, false) -- remove pair from ignore list

Written by Pedro Gimeno, donated to the public domain.

--]=======================================================================]--

local weak = {__mode = 'k'}

return function(world)
  local collisionPairs = setmetatable({}, weak)
  world:setContactFilter(function (fixt1, fixt2)
    return not (collisionPairs[fixt1] and collisionPairs[fixt1][fixt2]
             or collisionPairs[fixt2] and collisionPairs[fixt2][fixt1])
  end)
  return function(fixt1, fixt2, ignore)
    if ignore then
      -- Try to not duplicate pairs
      if collisionPairs[fixt1] and collisionPairs[fixt1][fixt2] then return end
      if collisionPairs[fixt2] then
        collisionPairs[fixt2][fixt1] = true
        return
      end
      if not collisionPairs[fixt1] then
        collisionPairs[fixt1] = setmetatable({}, weak)
      end
      collisionPairs[fixt1][fixt2] = true
      return
    end

    -- ignore is false - remove the entry
    if collisionPairs[fixt1] then
      collisionPairs[fixt1][fixt2] = nil
    end
    if collisionPairs[fixt2] then
      collisionPairs[fixt2][fixt1] = nil
    end
  end
end