29 lines
1.4 KiB
Text
29 lines
1.4 KiB
Text
# owned.ludic - a shape a body owns: made for that body alone (a trunk's pillar, a boulder's scaled
|
|
# hull, a dropped thing's box) and freed when the body is removed, so a still thing put in and taken out
|
|
# again and again - a chunk that comes and goes - holds no more shapes than are standing
|
|
const PH_INDEX: int = 8388607 # a body id's low 23 bits are its index (Jolt's BodyID)
|
|
|
|
# every body owns nothing: at a world's opening, the table made once at its size and kept after
|
|
@alloc_ok("the body table made at its size when a world opens, kept after")
|
|
function ph_own_reset(physics_st: mut PhysicsState, max_bodies: int) -> void {
|
|
if len(physics_st.ph_own) < max_bodies {
|
|
List.clear(physics_st.ph_own)
|
|
for i in 0 .. max_bodies { push(physics_st.ph_own, -1) }
|
|
return
|
|
}
|
|
for i in 0 .. len(physics_st.ph_own) { physics_st.ph_own[i] = -1 }
|
|
}
|
|
|
|
# body `id` owns `shape`: phys_remove frees it with the body
|
|
export function phys_own(physics_st: mut PhysicsState, id: int, shape: int) -> void {
|
|
if id < 0 or shape < 0 { return }
|
|
let i = id & PH_INDEX
|
|
if i < len(physics_st.ph_own) { physics_st.ph_own[i] = shape }
|
|
}
|
|
|
|
function ph_own_free(physics_st: mut PhysicsState, id: int) -> void {
|
|
let i = id & PH_INDEX
|
|
if i >= len(physics_st.ph_own) or physics_st.ph_own[i] < 0 { return }
|
|
phys_shape_free(physics_st, physics_st.ph_own[i])
|
|
physics_st.ph_own[i] = -1
|
|
}
|