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More pooled storage for intersect.lua
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Max Cahill
parent
009beadc68
commit
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@ -9,8 +9,7 @@
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continuous sweeps (where provided) also return the
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time-domain position of first intersection
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TODO: refactor vector storage to be pooled rather than fully local
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so these functions can be reentrant
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TODO: refactor vector storage to be pooled where needed
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]]
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local path = (...):gsub("intersect", "")
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@ -35,18 +34,18 @@ function intersect.circle_circle_overlap(a_pos, a_rad, b_pos, b_rad)
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return a_pos:distance_squared(b_pos) < rad * rad
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end
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local _ccc_delta = vec2:zero()
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function intersect.circle_circle_collide(a_pos, a_rad, b_pos, b_rad, into)
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--get delta
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_ccc_delta:vset(a_pos):vsubi(b_pos)
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local delta = a_pos:pooled_copy():vsubi(b_pos)
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--squared threshold
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local rad = a_rad + b_rad
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local dist = _ccc_delta:length_squared()
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local dist = delta:length_squared()
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local res = false
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if dist < rad * rad then
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if dist == 0 then
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--singular case; just resolve vertically
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dist = 1
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_ccc_delta:sset(0,1)
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delta:sset(0,1)
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else
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--get actual distance
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dist = math.sqrt(dist)
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@ -56,10 +55,10 @@ function intersect.circle_circle_collide(a_pos, a_rad, b_pos, b_rad, into)
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into = vec2:zero()
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end
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--normalise, scale to separating distance
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into:vset(_ccc_delta):sdivi(dist):smuli(rad - dist)
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return into
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res = into:vset(delta):sdivi(dist):smuli(rad - dist)
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end
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return false
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delta:release()
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return res
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end
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------------------------------------------------------------------------------
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@ -237,80 +236,66 @@ end
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-- axis aligned bounding boxes
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--return true on overlap, false otherwise
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local _apo_delta = vec2:zero()
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function intersect.aabb_point_overlap(pos, hs, v)
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_apo_delta:vset(pos):vsubi(v):absi()
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return _apo_delta.x < hs.x and _apo_delta.y < hs.y
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local delta = pos:pooled_copy():vsubi(v):absi()
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local overlap = delta.x < hs.x and delta.y < hs.y
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delta:release()
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return overlap
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end
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-- discrete displacement
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-- return msv to push point to closest edge of aabb
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local _apo_delta_c = vec2:zero()
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local _apo_delta_c_abs = vec2:zero()
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function intersect.aabb_point_collide(pos, hs, v, into)
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--separation between centres
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_apo_delta_c
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:vset(v)
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:vsubi(pos)
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local delta_c = v:pooled_copy():vsubi(pos)
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--absolute separation
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_apo_delta_c_abs
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:vset(_apo_delta_c)
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:absi()
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if _apo_delta_c_abs.x < hs.x and _apo_delta_c_abs.y < hs.y then
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return (into or vec2:zero())
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local delta_c_abs = delta_c:pooled_copy():absi()
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local res = false
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if delta_c_abs.x < hs.x and delta_c_abs.y < hs.y then
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res = (into or vec2:zero())
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--separating offset in both directions
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:vset(hs)
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:vsubi(_apo_delta_c_abs)
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:vsubi(delta_c_abs)
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--minimum separating distance
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:minori()
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--in the right direction
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:vmuli(_apo_delta_c:signi())
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:vmuli(delta_c:signi())
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--from the aabb's point of view
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:smuli(-1)
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end
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return false
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vec2.release(delta_c, delta_c_abs)
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return res
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end
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--return true on overlap, false otherwise
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local _aao_abs_delta = vec2:zero()
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local _aao_total_size = vec2:zero()
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function intersect.aabb_aabb_overlap(a_pos, a_hs, b_pos, b_hs)
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_aao_abs_delta:vset(a_pos):vsubi(b_pos):absi()
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_aao_total_size:vset(a_hs):vaddi(b_hs)
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return _aao_abs_delta.x < _aao_total_size.x and _aao_abs_delta.y < _aao_total_size.y
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local delta = a_pos:pooled_copy():vsubi(b_pos):absi()
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local total_size = a_hs:pooled_copy():vaddi(b_hs)
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local overlap = delta.x < total_size.x and delta.y < total_size.y
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vec2.release(delta, total_size)
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return overlap
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end
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--discrete displacement
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--return msv on collision, false otherwise
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local _aac_delta = vec2:zero()
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local _aac_abs_delta = vec2:zero()
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local _aac_size = vec2:zero()
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local _aac_abs_amount = vec2:zero()
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function intersect.aabb_aabb_collide(a_pos, a_hs, b_pos, b_hs, into)
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if not into then into = vec2:zero() end
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_aac_delta:vset(a_pos):vsubi(b_pos)
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_aac_abs_delta:vset(_aac_delta):absi()
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_aac_size:vset(a_hs):vaddi(b_hs)
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_aac_abs_amount:vset(_aac_size):vsubi(_aac_abs_delta)
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if _aac_abs_amount.x > COLLIDE_EPS and _aac_abs_amount.y > COLLIDE_EPS then
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local delta = a_pos:pooled_copy():vsubi(b_pos)
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local abs_delta = delta:pooled_copy():absi()
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local size = a_hs:pooled_copy():vaddi(b_hs)
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local abs_amount = size:pooled_copy():vsubi(abs_delta)
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local res = false
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if abs_amount.x > COLLIDE_EPS and abs_amount.y > COLLIDE_EPS then
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--actually collided
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if _aac_abs_amount.x <= _aac_abs_amount.y then
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if abs_amount.x <= abs_amount.y then
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--x min
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if _aac_delta.x < 0 then
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return into:sset(-_aac_abs_amount.x, 0)
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else
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return into:sset(_aac_abs_amount.x, 0)
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end
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res = into:sset(abs_amount.x * math.sign(delta.x), 0)
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else
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--y min
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if _aac_delta.y < 0 then
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return into:sset(0, -_aac_abs_amount.y)
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else
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return into:sset(0, _aac_abs_amount.y)
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end
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res = into:sset(0, abs_amount.y * math.sign(delta.y))
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end
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end
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return false
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return res
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end
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--return normal and fraction of dt encountered on collision, false otherwise
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