gistfile1.nim

iterator matchEntsComponents(scene: SceneId; typ1: typedesc; typ2: typedesc): tuple[a: ptr TComponent[typ1], b: ptr TComponent[typ2]] {.inline.} =
  var comps1 = components(scene, TComponent[typ1])
  var comps2 = components(scene, TComponent[typ2])
  for i1 in 0..comps1.high:
    for i2 in 0..comps2.high:
      if comps1[i1].id == comps2[i2].id:
        yield (addr comps1[i1], addr comps2[i2])
        break
iterator matchEntsComponents(scene: SceneId; typ1: typedesc; typ2: typedesc; typ3: typedesc): 
  tuple[a: ptr TComponent[typ1]; b: ptr TComponent[typ2], c: ptr TComponent[typ3]] {.inline.} =
  var comps = components(scene, TComponent[typ3])
  for a,b in matchEntsComponents(scene, typ1, typ2):
    for i in 0..comps.high:
      if comps[i].id == a.id:
        yield (a, b, addr comps[i])
iterator matchEnts*(scene: SceneId; typ1: typedesc; typ2: typedesc): tuple[a: ptr typ1, b: ptr typ2] {.inline.} =
  var comps1 = components(scene, TComponent[typ1])
  var comps2 = components(scene, TComponnet[typ2])
  for a,b in matchEntsComponents(scene, typ1, typ2):
    yield (addr a[].data, addr b[].data)
iterator matchEnts*(scene: SceneId; typ1: typedesc; typ2: typedesc; typ3: typedesc): tuple[a: ptr typ1, b: ptr typ2, c: ptr typ3] {.inline.} =
  for a,b,c in matchEntsComponents(scene, typ1, typ2, typ3):
    yield( addr a[].data, addr b[].data, addr c[].data)

proc matchEnt*(scene: SceneId; typ1: typedesc): EntityId =
  result = components(scene, TComponent[typ1])[0].id
proc matchEnt*(scene: SceneId; typ1: typedesc; typ2: typedesc): EntityId =
  result = (-1).EntityId
  for elm in components(scene, TComponent[typ1]):
    for typ in components(scene, TComponent[typ2]):
      if typ.id == elm.id:
        return elm.id

proc matchEnt*(scene: SceneId; typ1: typedesc; typ2: typedesc; typ3: typedesc): EntityId =
  result = (-1).EntityId
  for elm1 in components(scene, TComponent[typ1]):
    for elm2 in components(scene, TComponent[typ2]):
      if elm2.id == elm1.id:
        for elm3 in components(scene, TComponent[typ3]):
          if elm3.id == elm2.id:
            return elm1.id