odin-ecs/get_components.odin at main · 4odin/odin-ecs · GitHub

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package ecs

/*
NOTE:
I know, code duplication...

There is no way to take in an array of types, and it will not be added to the language.
The only reasonable solution is this...
*/

get_components_2 :: proc(ctx: ^Context, entity: Entity, $A, $B: typeid) -> (^A, ^B, [2]ECS_Error) {
  a, err1 := get_component(ctx, entity, A)
  b, err2 := get_component(ctx, entity, B)
  return a, b, {}
}

get_components_3 :: proc(ctx: ^Context, entity: Entity, $A, $B, $C: typeid) -> (^A, ^B, ^C, [3]ECS_Error) {
  a, err1 := get_component(ctx, entity, A)
  b, err2 := get_component(ctx, entity, B)
  c, err3 := get_component(ctx, entity, C)
  return a, b, c, {}
}

get_components_4 :: proc(ctx: ^Context, entity: Entity, $A, $B, $C, $D: typeid) -> (^A, ^B, ^C, ^D, [4]ECS_Error) {
  a, err1 := get_component(ctx, entity, A)
  b, err2 := get_component(ctx, entity, B)
  c, err3 := get_component(ctx, entity, C)
  d, err4 := get_component(ctx, entity, D)
  return a, b, c, d, {}
}

get_components_5 :: proc(ctx: ^Context, entity: Entity, $A, $B, $C, $D, $E: typeid) -> (^A, ^B, ^C, ^D, ^E, [5]ECS_Error) {
  a, err1 := get_component(ctx, entity, A)
  b, err2 := get_component(ctx, entity, B)
  c, err3 := get_component(ctx, entity, C)
  d, err4 := get_component(ctx, entity, D)
  e, err5 := get_component(ctx, entity, E)
  return a, b, c, d, e, {}
}

get_components :: proc {
  get_components_2,
  get_components_3,
  get_components_4,
  get_components_5,
}

get_component_slice_from_entities :: proc (ctx:^Context, entities:[]Entity, $T:typeid, allocator := context.allocator) -> []^T {
  context.user_ptr = ctx
  get_t_proc :: proc (h:Entity) -> ^T {
      e, err :=  get_component(cast(^Context)context.user_ptr, h, T) or_else nil
      return e
  }
  return slice.mapper(entities, get_t_proc)
}