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godot/servers/physics_2d/godot_space_2d.cpp
Rémi Verschelde fe52458154
Update copyright statements to 2022 
Happy new year to the wonderful Godot community!
2022-01-03 21:27:34 +01:00

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/*************************************************************************/
/* godot_space_2d.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "godot_space_2d.h"
#include "godot_collision_solver_2d.h"
#include "godot_physics_server_2d.h"
#include "core/os/os.h"
#include "core/templates/pair.h"
#define TEST_MOTION_MARGIN_MIN_VALUE 0.0001
#define TEST_MOTION_MIN_CONTACT_DEPTH_FACTOR 0.05
_FORCE_INLINE_ static bool _can_collide_with(GodotCollisionObject2D *p_object, uint32_t p_collision_mask, bool p_collide_with_bodies, bool p_collide_with_areas) {
if (!(p_object->get_collision_layer() & p_collision_mask)) {
return false;
}
if (p_object->get_type() == GodotCollisionObject2D::TYPE_AREA && !p_collide_with_areas) {
return false;
}
if (p_object->get_type() == GodotCollisionObject2D::TYPE_BODY && !p_collide_with_bodies) {
return false;
}
return true;
}
int GodotPhysicsDirectSpaceState2D::intersect_point(const PointParameters &p_parameters, ShapeResult *r_results, int p_result_max) {
if (p_result_max <= 0) {
return 0;
}
Rect2 aabb;
aabb.position = p_parameters.position - Vector2(0.00001, 0.00001);
aabb.size = Vector2(0.00002, 0.00002);
int amount = space->broadphase->cull_aabb(aabb, space->intersection_query_results, GodotSpace2D::INTERSECTION_QUERY_MAX, space->intersection_query_subindex_results);
int cc = 0;
for (int i = 0; i < amount; i++) {
if (!_can_collide_with(space->intersection_query_results[i], p_parameters.collision_mask, p_parameters.collide_with_bodies, p_parameters.collide_with_areas)) {
continue;
}
if (p_parameters.exclude.has(space->intersection_query_results[i]->get_self())) {
continue;
}
const GodotCollisionObject2D *col_obj = space->intersection_query_results[i];
if (p_parameters.pick_point && !col_obj->is_pickable()) {
continue;
}
if (p_parameters.canvas_instance_id.is_valid() && col_obj->get_canvas_instance_id() != p_parameters.canvas_instance_id) {
continue;
}
int shape_idx = space->intersection_query_subindex_results[i];
GodotShape2D *shape = col_obj->get_shape(shape_idx);
Vector2 local_point = (col_obj->get_transform() * col_obj->get_shape_transform(shape_idx)).affine_inverse().xform(p_parameters.position);
if (!shape->contains_point(local_point)) {
continue;
}
if (cc >= p_result_max) {
continue;
}
r_results[cc].collider_id = col_obj->get_instance_id();
if (r_results[cc].collider_id.is_valid()) {
r_results[cc].collider = ObjectDB::get_instance(r_results[cc].collider_id);
}
r_results[cc].rid = col_obj->get_self();
r_results[cc].shape = shape_idx;
cc++;
}
return cc;
}
bool GodotPhysicsDirectSpaceState2D::intersect_ray(const RayParameters &p_parameters, RayResult &r_result) {
ERR_FAIL_COND_V(space->locked, false);
Vector2 begin, end;
Vector2 normal;
begin = p_parameters.from;
end = p_parameters.to;
normal = (end - begin).normalized();
int amount = space->broadphase->cull_segment(begin, end, space->intersection_query_results, GodotSpace2D::INTERSECTION_QUERY_MAX, space->intersection_query_subindex_results);
//todo, create another array that references results, compute AABBs and check closest point to ray origin, sort, and stop evaluating results when beyond first collision
bool collided = false;
Vector2 res_point, res_normal;
int res_shape;
const GodotCollisionObject2D *res_obj;
real_t min_d = 1e10;
for (int i = 0; i < amount; i++) {
if (!_can_collide_with(space->intersection_query_results[i], p_parameters.collision_mask, p_parameters.collide_with_bodies, p_parameters.collide_with_areas)) {
continue;
}
if (p_parameters.exclude.has(space->intersection_query_results[i]->get_self())) {
continue;
}
const GodotCollisionObject2D *col_obj = space->intersection_query_results[i];
int shape_idx = space->intersection_query_subindex_results[i];
Transform2D inv_xform = col_obj->get_shape_inv_transform(shape_idx) * col_obj->get_inv_transform();
Vector2 local_from = inv_xform.xform(begin);
Vector2 local_to = inv_xform.xform(end);
const GodotShape2D *shape = col_obj->get_shape(shape_idx);
Vector2 shape_point, shape_normal;
if (shape->contains_point(local_from)) {
if (p_parameters.hit_from_inside) {
// Hit shape at starting point.
min_d = 0;
res_point = local_from;
res_normal = Vector2();
res_shape = shape_idx;
res_obj = col_obj;
collided = true;
break;
} else {
// Ignore shape when starting inside.
continue;
}
}
if (shape->intersect_segment(local_from, local_to, shape_point, shape_normal)) {
Transform2D xform = col_obj->get_transform() * col_obj->get_shape_transform(shape_idx);
shape_point = xform.xform(shape_point);
real_t ld = normal.dot(shape_point);
if (ld < min_d) {
min_d = ld;
res_point = shape_point;
res_normal = inv_xform.basis_xform_inv(shape_normal).normalized();
res_shape = shape_idx;
res_obj = col_obj;
collided = true;
}
}
}
if (!collided) {
return false;
}
r_result.collider_id = res_obj->get_instance_id();
if (r_result.collider_id.is_valid()) {
r_result.collider = ObjectDB::get_instance(r_result.collider_id);
}
r_result.normal = res_normal;
r_result.position = res_point;
r_result.rid = res_obj->get_self();
r_result.shape = res_shape;
return true;
}
int GodotPhysicsDirectSpaceState2D::intersect_shape(const ShapeParameters &p_parameters, ShapeResult *r_results, int p_result_max) {
if (p_result_max <= 0) {
return 0;
}
GodotShape2D *shape = GodotPhysicsServer2D::godot_singleton->shape_owner.get_or_null(p_parameters.shape_rid);
ERR_FAIL_COND_V(!shape, 0);
Rect2 aabb = p_parameters.transform.xform(shape->get_aabb());
aabb = aabb.merge(Rect2(aabb.position + p_parameters.motion, aabb.size)); //motion
aabb = aabb.grow(p_parameters.margin);
int amount = space->broadphase->cull_aabb(aabb, space->intersection_query_results, GodotSpace2D::INTERSECTION_QUERY_MAX, space->intersection_query_subindex_results);
int cc = 0;
for (int i = 0; i < amount; i++) {
if (cc >= p_result_max) {
break;
}
if (!_can_collide_with(space->intersection_query_results[i], p_parameters.collision_mask, p_parameters.collide_with_bodies, p_parameters.collide_with_areas)) {
continue;
}
if (p_parameters.exclude.has(space->intersection_query_results[i]->get_self())) {
continue;
}
const GodotCollisionObject2D *col_obj = space->intersection_query_results[i];
int shape_idx = space->intersection_query_subindex_results[i];
if (!GodotCollisionSolver2D::solve(shape, p_parameters.transform, p_parameters.motion, col_obj->get_shape(shape_idx), col_obj->get_transform() * col_obj->get_shape_transform(shape_idx), Vector2(), nullptr, nullptr, nullptr, p_parameters.margin)) {
continue;
}
r_results[cc].collider_id = col_obj->get_instance_id();
if (r_results[cc].collider_id.is_valid()) {
r_results[cc].collider = ObjectDB::get_instance(r_results[cc].collider_id);
}
r_results[cc].rid = col_obj->get_self();
r_results[cc].shape = shape_idx;
cc++;
}
return cc;
}
bool GodotPhysicsDirectSpaceState2D::cast_motion(const ShapeParameters &p_parameters, real_t &p_closest_safe, real_t &p_closest_unsafe) {
GodotShape2D *shape = GodotPhysicsServer2D::godot_singleton->shape_owner.get_or_null(p_parameters.shape_rid);
ERR_FAIL_COND_V(!shape, false);
Rect2 aabb = p_parameters.transform.xform(shape->get_aabb());
aabb = aabb.merge(Rect2(aabb.position + p_parameters.motion, aabb.size)); //motion
aabb = aabb.grow(p_parameters.margin);
int amount = space->broadphase->cull_aabb(aabb, space->intersection_query_results, GodotSpace2D::INTERSECTION_QUERY_MAX, space->intersection_query_subindex_results);
real_t best_safe = 1;
real_t best_unsafe = 1;
for (int i = 0; i < amount; i++) {
if (!_can_collide_with(space->intersection_query_results[i], p_parameters.collision_mask, p_parameters.collide_with_bodies, p_parameters.collide_with_areas)) {
continue;
}
if (p_parameters.exclude.has(space->intersection_query_results[i]->get_self())) {
continue; //ignore excluded
}
const GodotCollisionObject2D *col_obj = space->intersection_query_results[i];
int shape_idx = space->intersection_query_subindex_results[i];
Transform2D col_obj_xform = col_obj->get_transform() * col_obj->get_shape_transform(shape_idx);
//test initial overlap, does it collide if going all the way?
if (!GodotCollisionSolver2D::solve(shape, p_parameters.transform, p_parameters.motion, col_obj->get_shape(shape_idx), col_obj_xform, Vector2(), nullptr, nullptr, nullptr, p_parameters.margin)) {
continue;
}
//test initial overlap, ignore objects it's inside of.
if (GodotCollisionSolver2D::solve(shape, p_parameters.transform, Vector2(), col_obj->get_shape(shape_idx), col_obj_xform, Vector2(), nullptr, nullptr, nullptr, p_parameters.margin)) {
continue;
}
Vector2 mnormal = p_parameters.motion.normalized();
//just do kinematic solving
real_t low = 0.0;
real_t hi = 1.0;
real_t fraction_coeff = 0.5;
for (int j = 0; j < 8; j++) { //steps should be customizable..
real_t fraction = low + (hi - low) * fraction_coeff;
Vector2 sep = mnormal; //important optimization for this to work fast enough
bool collided = GodotCollisionSolver2D::solve(shape, p_parameters.transform, p_parameters.motion * fraction, col_obj->get_shape(shape_idx), col_obj_xform, Vector2(), nullptr, nullptr, &sep, p_parameters.margin);
if (collided) {
hi = fraction;
if ((j == 0) || (low > 0.0)) { // Did it not collide before?
// When alternating or first iteration, use dichotomy.
fraction_coeff = 0.5;
} else {
// When colliding again, converge faster towards low fraction
// for more accurate results with long motions that collide near the start.
fraction_coeff = 0.25;
}
} else {
low = fraction;
if ((j == 0) || (hi < 1.0)) { // Did it collide before?
// When alternating or first iteration, use dichotomy.
fraction_coeff = 0.5;
} else {
// When not colliding again, converge faster towards high fraction
// for more accurate results with long motions that collide near the end.
fraction_coeff = 0.75;
}
}
}
if (low < best_safe) {
best_safe = low;
best_unsafe = hi;
}
}
p_closest_safe = best_safe;
p_closest_unsafe = best_unsafe;
return true;
}
bool GodotPhysicsDirectSpaceState2D::collide_shape(const ShapeParameters &p_parameters, Vector2 *r_results, int p_result_max, int &r_result_count) {
if (p_result_max <= 0) {
return false;
}
GodotShape2D *shape = GodotPhysicsServer2D::godot_singleton->shape_owner.get_or_null(p_parameters.shape_rid);
ERR_FAIL_COND_V(!shape, 0);
Rect2 aabb = p_parameters.transform.xform(shape->get_aabb());
aabb = aabb.merge(Rect2(aabb.position + p_parameters.motion, aabb.size)); //motion
aabb = aabb.grow(p_parameters.margin);
int amount = space->broadphase->cull_aabb(aabb, space->intersection_query_results, GodotSpace2D::INTERSECTION_QUERY_MAX, space->intersection_query_subindex_results);
bool collided = false;
r_result_count = 0;
GodotPhysicsServer2D::CollCbkData cbk;
cbk.max = p_result_max;
cbk.amount = 0;
cbk.passed = 0;
cbk.ptr = r_results;
GodotCollisionSolver2D::CallbackResult cbkres = GodotPhysicsServer2D::_shape_col_cbk;
GodotPhysicsServer2D::CollCbkData *cbkptr = &cbk;
for (int i = 0; i < amount; i++) {
if (!_can_collide_with(space->intersection_query_results[i], p_parameters.collision_mask, p_parameters.collide_with_bodies, p_parameters.collide_with_areas)) {
continue;
}
const GodotCollisionObject2D *col_obj = space->intersection_query_results[i];
if (p_parameters.exclude.has(col_obj->get_self())) {
continue;
}
int shape_idx = space->intersection_query_subindex_results[i];
cbk.valid_dir = Vector2();
cbk.valid_depth = 0;
if (GodotCollisionSolver2D::solve(shape, p_parameters.transform, p_parameters.motion, col_obj->get_shape(shape_idx), col_obj->get_transform() * col_obj->get_shape_transform(shape_idx), Vector2(), cbkres, cbkptr, nullptr, p_parameters.margin)) {
collided = cbk.amount > 0;
}
}
r_result_count = cbk.amount;
return collided;
}
struct _RestCallbackData2D {
const GodotCollisionObject2D *object = nullptr;
const GodotCollisionObject2D *best_object = nullptr;
int local_shape = 0;
int best_local_shape = 0;
int shape = 0;
int best_shape = 0;
Vector2 best_contact;
Vector2 best_normal;
real_t best_len = 0.0;
Vector2 valid_dir;
real_t valid_depth = 0.0;
real_t min_allowed_depth = 0.0;
};
static void _rest_cbk_result(const Vector2 &p_point_A, const Vector2 &p_point_B, void *p_userdata) {
_RestCallbackData2D *rd = (_RestCallbackData2D *)p_userdata;
Vector2 contact_rel = p_point_B - p_point_A;
real_t len = contact_rel.length();
if (len < rd->min_allowed_depth) {
return;
}
if (len <= rd->best_len) {
return;
}
Vector2 normal = contact_rel / len;
if (rd->valid_dir != Vector2()) {
if (len > rd->valid_depth) {
return;
}
if (rd->valid_dir.dot(normal) > -CMP_EPSILON) {
return;
}
}
rd->best_len = len;
rd->best_contact = p_point_B;
rd->best_normal = normal;
rd->best_object = rd->object;
rd->best_shape = rd->shape;
rd->best_local_shape = rd->local_shape;
}
bool GodotPhysicsDirectSpaceState2D::rest_info(const ShapeParameters &p_parameters, ShapeRestInfo *r_info) {
GodotShape2D *shape = GodotPhysicsServer2D::godot_singleton->shape_owner.get_or_null(p_parameters.shape_rid);
ERR_FAIL_COND_V(!shape, 0);
real_t margin = MAX(p_parameters.margin, TEST_MOTION_MARGIN_MIN_VALUE);
Rect2 aabb = p_parameters.transform.xform(shape->get_aabb());
aabb = aabb.merge(Rect2(aabb.position + p_parameters.motion, aabb.size)); //motion
aabb = aabb.grow(margin);
int amount = space->broadphase->cull_aabb(aabb, space->intersection_query_results, GodotSpace2D::INTERSECTION_QUERY_MAX, space->intersection_query_subindex_results);
_RestCallbackData2D rcd;
// Allowed depth can't be lower than motion length, in order to handle contacts at low speed.
real_t motion_length = p_parameters.motion.length();
real_t min_contact_depth = margin * TEST_MOTION_MIN_CONTACT_DEPTH_FACTOR;
rcd.min_allowed_depth = MIN(motion_length, min_contact_depth);
for (int i = 0; i < amount; i++) {
if (!_can_collide_with(space->intersection_query_results[i], p_parameters.collision_mask, p_parameters.collide_with_bodies, p_parameters.collide_with_areas)) {
continue;
}
const GodotCollisionObject2D *col_obj = space->intersection_query_results[i];
if (p_parameters.exclude.has(col_obj->get_self())) {
continue;
}
int shape_idx = space->intersection_query_subindex_results[i];
rcd.valid_dir = Vector2();
rcd.object = col_obj;
rcd.shape = shape_idx;
rcd.local_shape = 0;
bool sc = GodotCollisionSolver2D::solve(shape, p_parameters.transform, p_parameters.motion, col_obj->get_shape(shape_idx), col_obj->get_transform() * col_obj->get_shape_transform(shape_idx), Vector2(), _rest_cbk_result, &rcd, nullptr, margin);
if (!sc) {
continue;
}
}
if (rcd.best_len == 0 || !rcd.best_object) {
return false;
}
r_info->collider_id = rcd.best_object->get_instance_id();
r_info->shape = rcd.best_shape;
r_info->normal = rcd.best_normal;
r_info->point = rcd.best_contact;
r_info->rid = rcd.best_object->get_self();
if (rcd.best_object->get_type() == GodotCollisionObject2D::TYPE_BODY) {
const GodotBody2D *body = static_cast<const GodotBody2D *>(rcd.best_object);
Vector2 rel_vec = r_info->point - (body->get_transform().get_origin() + body->get_center_of_mass());
r_info->linear_velocity = Vector2(-body->get_angular_velocity() * rel_vec.y, body->get_angular_velocity() * rel_vec.x) + body->get_linear_velocity();
} else {
r_info->linear_velocity = Vector2();
}
return true;
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////
int GodotSpace2D::_cull_aabb_for_body(GodotBody2D *p_body, const Rect2 &p_aabb) {
int amount = broadphase->cull_aabb(p_aabb, intersection_query_results, INTERSECTION_QUERY_MAX, intersection_query_subindex_results);
for (int i = 0; i < amount; i++) {
bool keep = true;
if (intersection_query_results[i] == p_body) {
keep = false;
} else if (intersection_query_results[i]->get_type() == GodotCollisionObject2D::TYPE_AREA) {
keep = false;
} else if (!p_body->collides_with(static_cast<GodotBody2D *>(intersection_query_results[i]))) {
keep = false;
} else if (static_cast<GodotBody2D *>(intersection_query_results[i])->has_exception(p_body->get_self()) || p_body->has_exception(intersection_query_results[i]->get_self())) {
keep = false;
}
if (!keep) {
if (i < amount - 1) {
SWAP(intersection_query_results[i], intersection_query_results[amount - 1]);
SWAP(intersection_query_subindex_results[i], intersection_query_subindex_results[amount - 1]);
}
amount--;
i--;
}
}
return amount;
}
bool GodotSpace2D::test_body_motion(GodotBody2D *p_body, const PhysicsServer2D::MotionParameters &p_parameters, PhysicsServer2D::MotionResult *r_result) {
//give me back regular physics engine logic
//this is madness
//and most people using this function will think
//what it does is simpler than using physics
//this took about a week to get right..
//but is it right? who knows at this point..
if (r_result) {
r_result->collider_id = ObjectID();
r_result->collider_shape = 0;
}
Rect2 body_aabb;
bool shapes_found = false;
for (int i = 0; i < p_body->get_shape_count(); i++) {
if (p_body->is_shape_disabled(i)) {
continue;
}
if (!shapes_found) {
body_aabb = p_body->get_shape_aabb(i);
shapes_found = true;
} else {
body_aabb = body_aabb.merge(p_body->get_shape_aabb(i));
}
}
if (!shapes_found) {
if (r_result) {
*r_result = PhysicsServer2D::MotionResult();
r_result->travel = p_parameters.motion;
}
return false;
}
real_t margin = MAX(p_parameters.margin, TEST_MOTION_MARGIN_MIN_VALUE);
// Undo the currently transform the physics server is aware of and apply the provided one
body_aabb = p_parameters.from.xform(p_body->get_inv_transform().xform(body_aabb));
body_aabb = body_aabb.grow(margin);
static const int max_excluded_shape_pairs = 32;
ExcludedShapeSW excluded_shape_pairs[max_excluded_shape_pairs];
int excluded_shape_pair_count = 0;
real_t min_contact_depth = margin * TEST_MOTION_MIN_CONTACT_DEPTH_FACTOR;
real_t motion_length = p_parameters.motion.length();
Vector2 motion_normal = p_parameters.motion / motion_length;
Transform2D body_transform = p_parameters.from;
bool recovered = false;
{
//STEP 1, FREE BODY IF STUCK
const int max_results = 32;
int recover_attempts = 4;
Vector2 sr[max_results * 2];
do {
GodotPhysicsServer2D::CollCbkData cbk;
cbk.max = max_results;
cbk.amount = 0;
cbk.passed = 0;
cbk.ptr = sr;
cbk.invalid_by_dir = 0;
excluded_shape_pair_count = 0; //last step is the one valid
GodotPhysicsServer2D::CollCbkData *cbkptr = &cbk;
GodotCollisionSolver2D::CallbackResult cbkres = GodotPhysicsServer2D::_shape_col_cbk;
bool collided = false;
int amount = _cull_aabb_for_body(p_body, body_aabb);
for (int j = 0; j < p_body->get_shape_count(); j++) {
if (p_body->is_shape_disabled(j)) {
continue;
}
GodotShape2D *body_shape = p_body->get_shape(j);
Transform2D body_shape_xform = body_transform * p_body->get_shape_transform(j);
for (int i = 0; i < amount; i++) {
const GodotCollisionObject2D *col_obj = intersection_query_results[i];
if (p_parameters.exclude_bodies.has(col_obj->get_self())) {
continue;
}
if (p_parameters.exclude_objects.has(col_obj->get_instance_id())) {
continue;
}
int shape_idx = intersection_query_subindex_results[i];
Transform2D col_obj_shape_xform = col_obj->get_transform() * col_obj->get_shape_transform(shape_idx);
if (body_shape->allows_one_way_collision() && col_obj->is_shape_set_as_one_way_collision(shape_idx)) {
cbk.valid_dir = col_obj_shape_xform.get_axis(1).normalized();
real_t owc_margin = col_obj->get_shape_one_way_collision_margin(shape_idx);
cbk.valid_depth = MAX(owc_margin, margin); //user specified, but never less than actual margin or it won't work
cbk.invalid_by_dir = 0;
if (col_obj->get_type() == GodotCollisionObject2D::TYPE_BODY) {
const GodotBody2D *b = static_cast<const GodotBody2D *>(col_obj);
if (b->get_mode() == PhysicsServer2D::BODY_MODE_KINEMATIC || b->get_mode() == PhysicsServer2D::BODY_MODE_DYNAMIC) {
//fix for moving platforms (kinematic and dynamic), margin is increased by how much it moved in the given direction
Vector2 lv = b->get_linear_velocity();
//compute displacement from linear velocity
Vector2 motion = lv * last_step;
real_t motion_len = motion.length();
motion.normalize();
cbk.valid_depth += motion_len * MAX(motion.dot(-cbk.valid_dir), 0.0);
}
}
} else {
cbk.valid_dir = Vector2();
cbk.valid_depth = 0;
cbk.invalid_by_dir = 0;
}
int current_passed = cbk.passed; //save how many points passed collision
bool did_collide = false;
GodotShape2D *against_shape = col_obj->get_shape(shape_idx);
if (GodotCollisionSolver2D::solve(body_shape, body_shape_xform, Vector2(), against_shape, col_obj_shape_xform, Vector2(), cbkres, cbkptr, nullptr, margin)) {
did_collide = cbk.passed > current_passed; //more passed, so collision actually existed
}
if (!did_collide && cbk.invalid_by_dir > 0) {
//this shape must be excluded
if (excluded_shape_pair_count < max_excluded_shape_pairs) {
ExcludedShapeSW esp;
esp.local_shape = body_shape;
esp.against_object = col_obj;
esp.against_shape_index = shape_idx;
excluded_shape_pairs[excluded_shape_pair_count++] = esp;
}
}
if (did_collide) {
collided = true;
}
}
}
if (!collided) {
break;
}
recovered = true;
Vector2 recover_motion;
for (int i = 0; i < cbk.amount; i++) {
Vector2 a = sr[i * 2 + 0];
Vector2 b = sr[i * 2 + 1];
// Compute plane on b towards a.
Vector2 n = (a - b).normalized();
real_t d = n.dot(b);
// Compute depth on recovered motion.
real_t depth = n.dot(a + recover_motion) - d;
if (depth > min_contact_depth + CMP_EPSILON) {
// Only recover if there is penetration.
recover_motion -= n * (depth - min_contact_depth) * 0.4;
}
}
if (recover_motion == Vector2()) {
collided = false;
break;
}
body_transform.elements[2] += recover_motion;
body_aabb.position += recover_motion;
recover_attempts--;
} while (recover_attempts);
}
real_t safe = 1.0;
real_t unsafe = 1.0;
int best_shape = -1;
{
// STEP 2 ATTEMPT MOTION
Rect2 motion_aabb = body_aabb;
motion_aabb.position += p_parameters.motion;
motion_aabb = motion_aabb.merge(body_aabb);
int amount = _cull_aabb_for_body(p_body, motion_aabb);
for (int body_shape_idx = 0; body_shape_idx < p_body->get_shape_count(); body_shape_idx++) {
if (p_body->is_shape_disabled(body_shape_idx)) {
continue;
}
GodotShape2D *body_shape = p_body->get_shape(body_shape_idx);
// Colliding separation rays allows to properly snap to the ground,
// otherwise it's not needed in regular motion.
if (!p_parameters.collide_separation_ray && (body_shape->get_type() == PhysicsServer2D::SHAPE_SEPARATION_RAY)) {
// When slide on slope is on, separation ray shape acts like a regular shape.
if (!static_cast<GodotSeparationRayShape2D *>(body_shape)->get_slide_on_slope()) {
continue;
}
}
Transform2D body_shape_xform = body_transform * p_body->get_shape_transform(body_shape_idx);
bool stuck = false;
real_t best_safe = 1;
real_t best_unsafe = 1;
for (int i = 0; i < amount; i++) {
const GodotCollisionObject2D *col_obj = intersection_query_results[i];
if (p_parameters.exclude_bodies.has(col_obj->get_self())) {
continue;
}
if (p_parameters.exclude_objects.has(col_obj->get_instance_id())) {
continue;
}
int col_shape_idx = intersection_query_subindex_results[i];
GodotShape2D *against_shape = col_obj->get_shape(col_shape_idx);
bool excluded = false;
for (int k = 0; k < excluded_shape_pair_count; k++) {
if (excluded_shape_pairs[k].local_shape == body_shape && excluded_shape_pairs[k].against_object == col_obj && excluded_shape_pairs[k].against_shape_index == col_shape_idx) {
excluded = true;
break;
}
}
if (excluded) {
continue;
}
Transform2D col_obj_shape_xform = col_obj->get_transform() * col_obj->get_shape_transform(col_shape_idx);
//test initial overlap, does it collide if going all the way?
if (!GodotCollisionSolver2D::solve(body_shape, body_shape_xform, p_parameters.motion, against_shape, col_obj_shape_xform, Vector2(), nullptr, nullptr, nullptr, 0)) {
continue;
}
//test initial overlap
if (GodotCollisionSolver2D::solve(body_shape, body_shape_xform, Vector2(), against_shape, col_obj_shape_xform, Vector2(), nullptr, nullptr, nullptr, 0)) {
if (body_shape->allows_one_way_collision() && col_obj->is_shape_set_as_one_way_collision(col_shape_idx)) {
Vector2 direction = col_obj_shape_xform.get_axis(1).normalized();
if (motion_normal.dot(direction) < 0) {
continue;
}
}
stuck = true;
break;
}
//just do kinematic solving
real_t low = 0.0;
real_t hi = 1.0;
real_t fraction_coeff = 0.5;
for (int k = 0; k < 8; k++) { //steps should be customizable..
real_t fraction = low + (hi - low) * fraction_coeff;
Vector2 sep = motion_normal; //important optimization for this to work fast enough
bool collided = GodotCollisionSolver2D::solve(body_shape, body_shape_xform, p_parameters.motion * fraction, against_shape, col_obj_shape_xform, Vector2(), nullptr, nullptr, &sep, 0);
if (collided) {
hi = fraction;
if ((k == 0) || (low > 0.0)) { // Did it not collide before?
// When alternating or first iteration, use dichotomy.
fraction_coeff = 0.5;
} else {
// When colliding again, converge faster towards low fraction
// for more accurate results with long motions that collide near the start.
fraction_coeff = 0.25;
}
} else {
low = fraction;
if ((k == 0) || (hi < 1.0)) { // Did it collide before?
// When alternating or first iteration, use dichotomy.
fraction_coeff = 0.5;
} else {
// When not colliding again, converge faster towards high fraction
// for more accurate results with long motions that collide near the end.
fraction_coeff = 0.75;
}
}
}
if (body_shape->allows_one_way_collision() && col_obj->is_shape_set_as_one_way_collision(col_shape_idx)) {
Vector2 cd[2];
GodotPhysicsServer2D::CollCbkData cbk;
cbk.max = 1;
cbk.amount = 0;
cbk.passed = 0;
cbk.ptr = cd;
cbk.valid_dir = col_obj_shape_xform.get_axis(1).normalized();
cbk.valid_depth = 10e20;
Vector2 sep = motion_normal; //important optimization for this to work fast enough
bool collided = GodotCollisionSolver2D::solve(body_shape, body_shape_xform, p_parameters.motion * (hi + contact_max_allowed_penetration), col_obj->get_shape(col_shape_idx), col_obj_shape_xform, Vector2(), GodotPhysicsServer2D::_shape_col_cbk, &cbk, &sep, 0);
if (!collided || cbk.amount == 0) {
continue;
}
}
if (low < best_safe) {
best_safe = low;
best_unsafe = hi;
}
}
if (stuck) {
safe = 0;
unsafe = 0;
best_shape = body_shape_idx; //sadly it's the best
break;
}
if (best_safe == 1.0) {
continue;
}
if (best_safe < safe) {
safe = best_safe;
unsafe = best_unsafe;
best_shape = body_shape_idx;
}
}
}
bool collided = false;
if (recovered || (safe < 1)) {
if (safe >= 1) {
best_shape = -1; //no best shape with cast, reset to -1
}
//it collided, let's get the rest info in unsafe advance
Transform2D ugt = body_transform;
ugt.elements[2] += p_parameters.motion * unsafe;
_RestCallbackData2D rcd;
// Allowed depth can't be lower than motion length, in order to handle contacts at low speed.
rcd.min_allowed_depth = MIN(motion_length, min_contact_depth);
int from_shape = best_shape != -1 ? best_shape : 0;
int to_shape = best_shape != -1 ? best_shape + 1 : p_body->get_shape_count();
for (int j = from_shape; j < to_shape; j++) {
if (p_body->is_shape_disabled(j)) {
continue;
}
Transform2D body_shape_xform = ugt * p_body->get_shape_transform(j);
GodotShape2D *body_shape = p_body->get_shape(j);
body_aabb.position += p_parameters.motion * unsafe;
int amount = _cull_aabb_for_body(p_body, body_aabb);
for (int i = 0; i < amount; i++) {
const GodotCollisionObject2D *col_obj = intersection_query_results[i];
if (p_parameters.exclude_bodies.has(col_obj->get_self())) {
continue;
}
if (p_parameters.exclude_objects.has(col_obj->get_instance_id())) {
continue;
}
int shape_idx = intersection_query_subindex_results[i];
GodotShape2D *against_shape = col_obj->get_shape(shape_idx);
bool excluded = false;
for (int k = 0; k < excluded_shape_pair_count; k++) {
if (excluded_shape_pairs[k].local_shape == body_shape && excluded_shape_pairs[k].against_object == col_obj && excluded_shape_pairs[k].against_shape_index == shape_idx) {
excluded = true;
break;
}
}
if (excluded) {
continue;
}
Transform2D col_obj_shape_xform = col_obj->get_transform() * col_obj->get_shape_transform(shape_idx);
if (body_shape->allows_one_way_collision() && col_obj->is_shape_set_as_one_way_collision(shape_idx)) {
rcd.valid_dir = col_obj_shape_xform.get_axis(1).normalized();
real_t owc_margin = col_obj->get_shape_one_way_collision_margin(shape_idx);
rcd.valid_depth = MAX(owc_margin, margin); //user specified, but never less than actual margin or it won't work
if (col_obj->get_type() == GodotCollisionObject2D::TYPE_BODY) {
const GodotBody2D *b = static_cast<const GodotBody2D *>(col_obj);
if (b->get_mode() == PhysicsServer2D::BODY_MODE_KINEMATIC || b->get_mode() == PhysicsServer2D::BODY_MODE_DYNAMIC) {
//fix for moving platforms (kinematic and dynamic), margin is increased by how much it moved in the given direction
Vector2 lv = b->get_linear_velocity();
//compute displacement from linear velocity
Vector2 motion = lv * last_step;
real_t motion_len = motion.length();
motion.normalize();
rcd.valid_depth += motion_len * MAX(motion.dot(-rcd.valid_dir), 0.0);
}
}
} else {
rcd.valid_dir = Vector2();
rcd.valid_depth = 0;
}
rcd.object = col_obj;
rcd.shape = shape_idx;
rcd.local_shape = j;
bool sc = GodotCollisionSolver2D::solve(body_shape, body_shape_xform, Vector2(), against_shape, col_obj_shape_xform, Vector2(), _rest_cbk_result, &rcd, nullptr, margin);
if (!sc) {
continue;
}
}
}
if (rcd.best_len != 0) {
if (r_result) {
r_result->collider = rcd.best_object->get_self();
r_result->collider_id = rcd.best_object->get_instance_id();
r_result->collider_shape = rcd.best_shape;
r_result->collision_local_shape = rcd.best_local_shape;
r_result->collision_normal = rcd.best_normal;
r_result->collision_point = rcd.best_contact;
r_result->collision_depth = rcd.best_len;
r_result->collision_safe_fraction = safe;
r_result->collision_unsafe_fraction = unsafe;
const GodotBody2D *body = static_cast<const GodotBody2D *>(rcd.best_object);
Vector2 rel_vec = r_result->collision_point - (body->get_transform().get_origin() + body->get_center_of_mass());
r_result->collider_velocity = Vector2(-body->get_angular_velocity() * rel_vec.y, body->get_angular_velocity() * rel_vec.x) + body->get_linear_velocity();
r_result->travel = safe * p_parameters.motion;
r_result->remainder = p_parameters.motion - safe * p_parameters.motion;
r_result->travel += (body_transform.get_origin() - p_parameters.from.get_origin());
}
collided = true;
}
}
if (!collided && r_result) {
r_result->travel = p_parameters.motion;
r_result->remainder = Vector2();
r_result->travel += (body_transform.get_origin() - p_parameters.from.get_origin());
}
return collided;
}
void *GodotSpace2D::_broadphase_pair(GodotCollisionObject2D *A, int p_subindex_A, GodotCollisionObject2D *B, int p_subindex_B, void *p_self) {
if (!A->interacts_with(B)) {
return nullptr;
}
GodotCollisionObject2D::Type type_A = A->get_type();
GodotCollisionObject2D::Type type_B = B->get_type();
if (type_A > type_B) {
SWAP(A, B);
SWAP(p_subindex_A, p_subindex_B);
SWAP(type_A, type_B);
}
GodotSpace2D *self = (GodotSpace2D *)p_self;
self->collision_pairs++;
if (type_A == GodotCollisionObject2D::TYPE_AREA) {
GodotArea2D *area = static_cast<GodotArea2D *>(A);
if (type_B == GodotCollisionObject2D::TYPE_AREA) {
GodotArea2D *area_b = static_cast<GodotArea2D *>(B);
GodotArea2Pair2D *area2_pair = memnew(GodotArea2Pair2D(area_b, p_subindex_B, area, p_subindex_A));
return area2_pair;
} else {
GodotBody2D *body = static_cast<GodotBody2D *>(B);
GodotAreaPair2D *area_pair = memnew(GodotAreaPair2D(body, p_subindex_B, area, p_subindex_A));
return area_pair;
}
} else {
GodotBodyPair2D *b = memnew(GodotBodyPair2D((GodotBody2D *)A, p_subindex_A, (GodotBody2D *)B, p_subindex_B));
return b;
}
return nullptr;
}
void GodotSpace2D::_broadphase_unpair(GodotCollisionObject2D *A, int p_subindex_A, GodotCollisionObject2D *B, int p_subindex_B, void *p_data, void *p_self) {
if (!p_data) {
return;
}
GodotSpace2D *self = (GodotSpace2D *)p_self;
self->collision_pairs--;
GodotConstraint2D *c = (GodotConstraint2D *)p_data;
memdelete(c);
}
const SelfList<GodotBody2D>::List &GodotSpace2D::get_active_body_list() const {
return active_list;
}
void GodotSpace2D::body_add_to_active_list(SelfList<GodotBody2D> *p_body) {
active_list.add(p_body);
}
void GodotSpace2D::body_remove_from_active_list(SelfList<GodotBody2D> *p_body) {
active_list.remove(p_body);
}
void GodotSpace2D::body_add_to_mass_properties_update_list(SelfList<GodotBody2D> *p_body) {
mass_properties_update_list.add(p_body);
}
void GodotSpace2D::body_remove_from_mass_properties_update_list(SelfList<GodotBody2D> *p_body) {
mass_properties_update_list.remove(p_body);
}
GodotBroadPhase2D *GodotSpace2D::get_broadphase() {
return broadphase;
}
void GodotSpace2D::add_object(GodotCollisionObject2D *p_object) {
ERR_FAIL_COND(objects.has(p_object));
objects.insert(p_object);
}
void GodotSpace2D::remove_object(GodotCollisionObject2D *p_object) {
ERR_FAIL_COND(!objects.has(p_object));
objects.erase(p_object);
}
const Set<GodotCollisionObject2D *> &GodotSpace2D::get_objects() const {
return objects;
}
void GodotSpace2D::body_add_to_state_query_list(SelfList<GodotBody2D> *p_body) {
state_query_list.add(p_body);
}
void GodotSpace2D::body_remove_from_state_query_list(SelfList<GodotBody2D> *p_body) {
state_query_list.remove(p_body);
}
void GodotSpace2D::area_add_to_monitor_query_list(SelfList<GodotArea2D> *p_area) {
monitor_query_list.add(p_area);
}
void GodotSpace2D::area_remove_from_monitor_query_list(SelfList<GodotArea2D> *p_area) {
monitor_query_list.remove(p_area);
}
void GodotSpace2D::area_add_to_moved_list(SelfList<GodotArea2D> *p_area) {
area_moved_list.add(p_area);
}
void GodotSpace2D::area_remove_from_moved_list(SelfList<GodotArea2D> *p_area) {
area_moved_list.remove(p_area);
}
const SelfList<GodotArea2D>::List &GodotSpace2D::get_moved_area_list() const {
return area_moved_list;
}
void GodotSpace2D::call_queries() {
while (state_query_list.first()) {
GodotBody2D *b = state_query_list.first()->self();
state_query_list.remove(state_query_list.first());
b->call_queries();
}
while (monitor_query_list.first()) {
GodotArea2D *a = monitor_query_list.first()->self();
monitor_query_list.remove(monitor_query_list.first());
a->call_queries();
}
}
void GodotSpace2D::setup() {
contact_debug_count = 0;
while (mass_properties_update_list.first()) {
mass_properties_update_list.first()->self()->update_mass_properties();
mass_properties_update_list.remove(mass_properties_update_list.first());
}
}
void GodotSpace2D::update() {
broadphase->update();
}
void GodotSpace2D::set_param(PhysicsServer2D::SpaceParameter p_param, real_t p_value) {
switch (p_param) {
case PhysicsServer2D::SPACE_PARAM_CONTACT_RECYCLE_RADIUS:
contact_recycle_radius = p_value;
break;
case PhysicsServer2D::SPACE_PARAM_CONTACT_MAX_SEPARATION:
contact_max_separation = p_value;
break;
case PhysicsServer2D::SPACE_PARAM_CONTACT_MAX_ALLOWED_PENETRATION:
contact_max_allowed_penetration = p_value;
break;
case PhysicsServer2D::SPACE_PARAM_CONTACT_DEFAULT_BIAS:
contact_bias = p_value;
break;
case PhysicsServer2D::SPACE_PARAM_BODY_LINEAR_VELOCITY_SLEEP_THRESHOLD:
body_linear_velocity_sleep_threshold = p_value;
break;
case PhysicsServer2D::SPACE_PARAM_BODY_ANGULAR_VELOCITY_SLEEP_THRESHOLD:
body_angular_velocity_sleep_threshold = p_value;
break;
case PhysicsServer2D::SPACE_PARAM_BODY_TIME_TO_SLEEP:
body_time_to_sleep = p_value;
break;
case PhysicsServer2D::SPACE_PARAM_CONSTRAINT_DEFAULT_BIAS:
constraint_bias = p_value;
break;
case PhysicsServer2D::SPACE_PARAM_SOLVER_ITERATIONS:
solver_iterations = p_value;
break;
}
}
real_t GodotSpace2D::get_param(PhysicsServer2D::SpaceParameter p_param) const {
switch (p_param) {
case PhysicsServer2D::SPACE_PARAM_CONTACT_RECYCLE_RADIUS:
return contact_recycle_radius;
case PhysicsServer2D::SPACE_PARAM_CONTACT_MAX_SEPARATION:
return contact_max_separation;
case PhysicsServer2D::SPACE_PARAM_CONTACT_MAX_ALLOWED_PENETRATION:
return contact_max_allowed_penetration;
case PhysicsServer2D::SPACE_PARAM_CONTACT_DEFAULT_BIAS:
return contact_bias;
case PhysicsServer2D::SPACE_PARAM_BODY_LINEAR_VELOCITY_SLEEP_THRESHOLD:
return body_linear_velocity_sleep_threshold;
case PhysicsServer2D::SPACE_PARAM_BODY_ANGULAR_VELOCITY_SLEEP_THRESHOLD:
return body_angular_velocity_sleep_threshold;
case PhysicsServer2D::SPACE_PARAM_BODY_TIME_TO_SLEEP:
return body_time_to_sleep;
case PhysicsServer2D::SPACE_PARAM_CONSTRAINT_DEFAULT_BIAS:
return constraint_bias;
case PhysicsServer2D::SPACE_PARAM_SOLVER_ITERATIONS:
return solver_iterations;
}
return 0;
}
void GodotSpace2D::lock() {
locked = true;
}
void GodotSpace2D::unlock() {
locked = false;
}
bool GodotSpace2D::is_locked() const {
return locked;
}
GodotPhysicsDirectSpaceState2D *GodotSpace2D::get_direct_state() {
return direct_access;
}
GodotSpace2D::GodotSpace2D() {
body_linear_velocity_sleep_threshold = GLOBAL_DEF("physics/2d/sleep_threshold_linear", 2.0);
body_angular_velocity_sleep_threshold = GLOBAL_DEF("physics/2d/sleep_threshold_angular", Math::deg2rad(8.0));
body_time_to_sleep = GLOBAL_DEF("physics/2d/time_before_sleep", 0.5);
ProjectSettings::get_singleton()->set_custom_property_info("physics/2d/time_before_sleep", PropertyInfo(Variant::FLOAT, "physics/2d/time_before_sleep", PROPERTY_HINT_RANGE, "0,5,0.01,or_greater"));
solver_iterations = GLOBAL_DEF("physics/2d/solver/solver_iterations", 16);
ProjectSettings::get_singleton()->set_custom_property_info("physics/2d/solver/solver_iterations", PropertyInfo(Variant::INT, "physics/2d/solver/solver_iterations", PROPERTY_HINT_RANGE, "1,32,1,or_greater"));
contact_recycle_radius = GLOBAL_DEF("physics/2d/solver/contact_recycle_radius", 1.0);
ProjectSettings::get_singleton()->set_custom_property_info("physics/2d/solver/contact_recycle_radius", PropertyInfo(Variant::FLOAT, "physics/2d/solver/contact_max_separation", PROPERTY_HINT_RANGE, "0,10,0.01,or_greater"));
contact_max_separation = GLOBAL_DEF("physics/2d/solver/contact_max_separation", 1.5);
ProjectSettings::get_singleton()->set_custom_property_info("physics/2d/solver/contact_max_separation", PropertyInfo(Variant::FLOAT, "physics/2d/solver/contact_max_separation", PROPERTY_HINT_RANGE, "0,10,0.01,or_greater"));
contact_max_allowed_penetration = GLOBAL_DEF("physics/2d/solver/contact_max_allowed_penetration", 0.3);
ProjectSettings::get_singleton()->set_custom_property_info("physics/2d/solver/contact_max_allowed_penetration", PropertyInfo(Variant::FLOAT, "physics/2d/solver/contact_max_allowed_penetration", PROPERTY_HINT_RANGE, "0,10,0.01,or_greater"));
contact_bias = GLOBAL_DEF("physics/2d/solver/default_contact_bias", 0.8);
ProjectSettings::get_singleton()->set_custom_property_info("physics/2d/solver/default_contact_bias", PropertyInfo(Variant::FLOAT, "physics/2d/solver/default_contact_bias", PROPERTY_HINT_RANGE, "0,1,0.01"));
constraint_bias = GLOBAL_DEF("physics/2d/solver/default_constraint_bias", 0.2);
ProjectSettings::get_singleton()->set_custom_property_info("physics/2d/solver/default_constraint_bias", PropertyInfo(Variant::FLOAT, "physics/2d/solver/default_constraint_bias", PROPERTY_HINT_RANGE, "0,1,0.01"));
broadphase = GodotBroadPhase2D::create_func();
broadphase->set_pair_callback(_broadphase_pair, this);
broadphase->set_unpair_callback(_broadphase_unpair, this);
direct_access = memnew(GodotPhysicsDirectSpaceState2D);
direct_access->space = this;
}
GodotSpace2D::~GodotSpace2D() {
memdelete(broadphase);
memdelete(direct_access);
}
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