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godot/modules/bullet/space_bullet.cpp

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/*************************************************************************/
/* space_bullet.cpp */
/* Author: AndreaCatania */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2017 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 "space_bullet.h"
#include "BulletCollision/CollisionDispatch/btCollisionObject.h"
#include "BulletCollision/CollisionDispatch/btGhostObject.h"
#include "BulletCollision/NarrowPhaseCollision/btGjkEpaPenetrationDepthSolver.h"
#include "BulletCollision/NarrowPhaseCollision/btGjkPairDetector.h"
#include "BulletCollision/NarrowPhaseCollision/btPointCollector.h"
#include "BulletSoftBody/btSoftBodyRigidBodyCollisionConfiguration.h"
#include "BulletSoftBody/btSoftRigidDynamicsWorld.h"
#include "btBulletDynamicsCommon.h"
#include "bullet_physics_server.h"
#include "bullet_types_converter.h"
#include "bullet_utilities.h"
#include "constraint_bullet.h"
#include "godot_collision_configuration.h"
#include "godot_collision_dispatcher.h"
#include "rigid_body_bullet.h"
#include "servers/physics_server.h"
#include "soft_body_bullet.h"
#include "ustring.h"
#include <assert.h>
BulletPhysicsDirectSpaceState::BulletPhysicsDirectSpaceState(SpaceBullet *p_space)
: PhysicsDirectSpaceState(), space(p_space) {}
int BulletPhysicsDirectSpaceState::intersect_point(const Vector3 &p_point, ShapeResult *r_results, int p_result_max, const Set<RID> &p_exclude, uint32_t p_collision_layer, uint32_t p_object_type_mask) {
if (p_result_max <= 0)
return 0;
btVector3 bt_point;
G_TO_B(p_point, bt_point);
btSphereShape sphere_point(0.f);
btCollisionObject collision_object_point;
collision_object_point.setCollisionShape(&sphere_point);
collision_object_point.setWorldTransform(btTransform(btQuaternion::getIdentity(), bt_point));
// Setup query
GodotAllContactResultCallback btResult(&collision_object_point, r_results, p_result_max, &p_exclude);
btResult.m_collisionFilterGroup = p_collision_layer;
btResult.m_collisionFilterMask = p_object_type_mask;
space->dynamicsWorld->contactTest(&collision_object_point, btResult);
// The results is already populated by GodotAllConvexResultCallback
return btResult.m_count;
}
bool BulletPhysicsDirectSpaceState::intersect_ray(const Vector3 &p_from, const Vector3 &p_to, RayResult &r_result, const Set<RID> &p_exclude, uint32_t p_collision_layer, uint32_t p_object_type_mask, bool p_pick_ray) {
btVector3 btVec_from;
btVector3 btVec_to;
G_TO_B(p_from, btVec_from);
G_TO_B(p_to, btVec_to);
// setup query
GodotClosestRayResultCallback btResult(btVec_from, btVec_to, &p_exclude);
btResult.m_collisionFilterGroup = p_collision_layer;
btResult.m_collisionFilterMask = p_object_type_mask;
btResult.m_pickRay = p_pick_ray;
space->dynamicsWorld->rayTest(btVec_from, btVec_to, btResult);
if (btResult.hasHit()) {
B_TO_G(btResult.m_hitPointWorld, r_result.position);
B_TO_G(btResult.m_hitNormalWorld.normalize(), r_result.normal);
CollisionObjectBullet *gObj = static_cast<CollisionObjectBullet *>(btResult.m_collisionObject->getUserPointer());
if (gObj) {
r_result.shape = 0;
r_result.rid = gObj->get_self();
r_result.collider_id = gObj->get_instance_id();
r_result.collider = 0 == r_result.collider_id ? NULL : ObjectDB::get_instance(r_result.collider_id);
} else {
WARN_PRINTS("The raycast performed has hit a collision object that is not part of Godot scene, please check it.");
}
return true;
} else {
return false;
}
}
int BulletPhysicsDirectSpaceState::intersect_shape(const RID &p_shape, const Transform &p_xform, float p_margin, ShapeResult *p_results, int p_result_max, const Set<RID> &p_exclude, uint32_t p_collision_layer, uint32_t p_object_type_mask) {
if (p_result_max <= 0)
return 0;
ShapeBullet *shape = space->get_physics_server()->get_shape_owner()->get(p_shape);
btConvexShape *btConvex = dynamic_cast<btConvexShape *>(shape->create_bt_shape());
if (!btConvex) {
bulletdelete(btConvex);
ERR_PRINTS("The shape is not a convex shape, then is not supported: shape type: " + itos(shape->get_type()));
return 0;
}
btVector3 scale_with_margin;
G_TO_B(p_xform.basis.get_scale(), scale_with_margin);
btConvex->setLocalScaling(scale_with_margin);
btTransform bt_xform;
G_TO_B(p_xform, bt_xform);
btCollisionObject collision_object;
collision_object.setCollisionShape(btConvex);
collision_object.setWorldTransform(bt_xform);
GodotAllContactResultCallback btQuery(&collision_object, p_results, p_result_max, &p_exclude);
btQuery.m_collisionFilterGroup = p_collision_layer;
btQuery.m_collisionFilterMask = p_object_type_mask;
btQuery.m_closestDistanceThreshold = p_margin;
space->dynamicsWorld->contactTest(&collision_object, btQuery);
bulletdelete(btConvex);
return btQuery.m_count;
}
bool BulletPhysicsDirectSpaceState::cast_motion(const RID &p_shape, const Transform &p_xform, const Vector3 &p_motion, float p_margin, float &p_closest_safe, float &p_closest_unsafe, const Set<RID> &p_exclude, uint32_t p_collision_layer, uint32_t p_object_type_mask, ShapeRestInfo *r_info) {
ShapeBullet *shape = space->get_physics_server()->get_shape_owner()->get(p_shape);
btConvexShape *bt_convex_shape = dynamic_cast<btConvexShape *>(shape->create_bt_shape());
if (!bt_convex_shape) {
bulletdelete(bt_convex_shape);
ERR_PRINTS("The shape is not a convex shape, then is not supported: shape type: " + itos(shape->get_type()));
return 0;
}
btVector3 bt_motion;
G_TO_B(p_motion, bt_motion);
btVector3 scale_with_margin;
G_TO_B(p_xform.basis.get_scale() + Vector3(p_margin, p_margin, p_margin), scale_with_margin);
bt_convex_shape->setLocalScaling(scale_with_margin);
btTransform bt_xform_from;
G_TO_B(p_xform, bt_xform_from);
btTransform bt_xform_to(bt_xform_from);
bt_xform_to.getOrigin() += bt_motion;
GodotClosestConvexResultCallback btResult(bt_xform_from.getOrigin(), bt_xform_to.getOrigin(), &p_exclude);
btResult.m_collisionFilterGroup = p_collision_layer;
btResult.m_collisionFilterMask = p_object_type_mask;
space->dynamicsWorld->convexSweepTest(bt_convex_shape, bt_xform_from, bt_xform_to, btResult, 0.002);
if (btResult.hasHit()) {
if (btCollisionObject::CO_RIGID_BODY == btResult.m_hitCollisionObject->getInternalType()) {
B_TO_G(static_cast<const btRigidBody *>(btResult.m_hitCollisionObject)->getVelocityInLocalPoint(btResult.m_hitPointWorld), r_info->linear_velocity);
}
CollisionObjectBullet *collision_object = static_cast<CollisionObjectBullet *>(btResult.m_hitCollisionObject->getUserPointer());
p_closest_safe = p_closest_unsafe = btResult.m_closestHitFraction;
B_TO_G(btResult.m_hitPointWorld, r_info->point);
B_TO_G(btResult.m_hitNormalWorld, r_info->normal);
r_info->rid = collision_object->get_self();
r_info->collider_id = collision_object->get_instance_id();
r_info->shape = btResult.m_shapePart;
}
bulletdelete(bt_convex_shape);
return btResult.hasHit();
}
/// Returns the list of contacts pairs in this order: Local contact, other body contact
bool BulletPhysicsDirectSpaceState::collide_shape(RID p_shape, const Transform &p_shape_xform, float p_margin, Vector3 *r_results, int p_result_max, int &r_result_count, const Set<RID> &p_exclude, uint32_t p_collision_layer, uint32_t p_object_type_mask) {
if (p_result_max <= 0)
return 0;
ShapeBullet *shape = space->get_physics_server()->get_shape_owner()->get(p_shape);
btConvexShape *btConvex = dynamic_cast<btConvexShape *>(shape->create_bt_shape());
if (!btConvex) {
bulletdelete(btConvex);
ERR_PRINTS("The shape is not a convex shape, then is not supported: shape type: " + itos(shape->get_type()));
return 0;
}
btVector3 scale_with_margin;
G_TO_B(p_shape_xform.basis.get_scale(), scale_with_margin);
btConvex->setLocalScaling(scale_with_margin);
btTransform bt_xform;
G_TO_B(p_shape_xform, bt_xform);
btCollisionObject collision_object;
collision_object.setCollisionShape(btConvex);
collision_object.setWorldTransform(bt_xform);
GodotContactPairContactResultCallback btQuery(&collision_object, r_results, p_result_max, &p_exclude);
btQuery.m_collisionFilterGroup = p_collision_layer;
btQuery.m_collisionFilterMask = p_object_type_mask;
btQuery.m_closestDistanceThreshold = p_margin;
space->dynamicsWorld->contactTest(&collision_object, btQuery);
r_result_count = btQuery.m_count;
bulletdelete(btConvex);
return btQuery.m_count;
}
bool BulletPhysicsDirectSpaceState::rest_info(RID p_shape, const Transform &p_shape_xform, float p_margin, ShapeRestInfo *r_info, const Set<RID> &p_exclude, uint32_t p_collision_layer, uint32_t p_object_type_mask) {
ShapeBullet *shape = space->get_physics_server()->get_shape_owner()->get(p_shape);
btConvexShape *btConvex = dynamic_cast<btConvexShape *>(shape->create_bt_shape());
if (!btConvex) {
bulletdelete(btConvex);
ERR_PRINTS("The shape is not a convex shape, then is not supported: shape type: " + itos(shape->get_type()));
return 0;
}
btVector3 scale_with_margin;
G_TO_B(p_shape_xform.basis.get_scale() + Vector3(p_margin, p_margin, p_margin), scale_with_margin);
btConvex->setLocalScaling(scale_with_margin);
btTransform bt_xform;
G_TO_B(p_shape_xform, bt_xform);
btCollisionObject collision_object;
collision_object.setCollisionShape(btConvex);
collision_object.setWorldTransform(bt_xform);
GodotRestInfoContactResultCallback btQuery(&collision_object, r_info, &p_exclude);
btQuery.m_collisionFilterGroup = p_collision_layer;
btQuery.m_collisionFilterMask = p_object_type_mask;
btQuery.m_closestDistanceThreshold = p_margin;
space->dynamicsWorld->contactTest(&collision_object, btQuery);
bulletdelete(btConvex);
if (btQuery.m_collided) {
if (btCollisionObject::CO_RIGID_BODY == btQuery.m_rest_info_collision_object->getInternalType()) {
B_TO_G(static_cast<const btRigidBody *>(btQuery.m_rest_info_collision_object)->getVelocityInLocalPoint(btQuery.m_rest_info_bt_point), r_info->linear_velocity);
}
B_TO_G(btQuery.m_rest_info_bt_point, r_info->point);
}
return btQuery.m_collided;
}
Vector3 BulletPhysicsDirectSpaceState::get_closest_point_to_object_volume(RID p_object, const Vector3 p_point) const {
RigidCollisionObjectBullet *rigid_object = space->get_physics_server()->get_rigid_collisin_object(p_object);
ERR_FAIL_COND_V(!rigid_object, Vector3());
btVector3 out_closest_point(0, 0, 0);
btScalar out_distance = 1e20;
btVector3 bt_point;
G_TO_B(p_point, bt_point);
btSphereShape point_shape(0.);
btCollisionShape *shape;
btConvexShape *convex_shape;
btTransform child_transform;
btTransform body_transform(rigid_object->get_bt_collision_object()->getWorldTransform());
btGjkPairDetector::ClosestPointInput input;
input.m_transformA.getBasis().setIdentity();
input.m_transformA.setOrigin(bt_point);
bool shapes_found = false;
btCompoundShape *compound = rigid_object->get_compound_shape();
for (int i = compound->getNumChildShapes() - 1; 0 <= i; --i) {
shape = compound->getChildShape(i);
if (shape->isConvex()) {
child_transform = compound->getChildTransform(i);
convex_shape = static_cast<btConvexShape *>(shape);
input.m_transformB = body_transform * child_transform;
btPointCollector result;
btGjkPairDetector gjk_pair_detector(&point_shape, convex_shape, space->gjk_simplex_solver, space->gjk_epa_pen_solver);
gjk_pair_detector.getClosestPoints(input, result, 0);
if (out_distance > result.m_distance) {
out_distance = result.m_distance;
out_closest_point = result.m_pointInWorld;
}
}
shapes_found = true;
}
if (shapes_found) {
Vector3 out;
B_TO_G(out_closest_point, out);
return out;
} else {
// no shapes found, use distance to origin.
return rigid_object->get_transform().get_origin();
}
}
SpaceBullet::SpaceBullet(bool p_create_soft_world)
: broadphase(NULL),
dispatcher(NULL),
solver(NULL),
collisionConfiguration(NULL),
dynamicsWorld(NULL),
soft_body_world_info(NULL),
ghostPairCallback(NULL),
godotFilterCallback(NULL),
gravityDirection(0, -1, 0),
gravityMagnitude(10),
contactDebugCount(0) {
create_empty_world(p_create_soft_world);
direct_access = memnew(BulletPhysicsDirectSpaceState(this));
}
SpaceBullet::~SpaceBullet() {
memdelete(direct_access);
destroy_world();
}
void SpaceBullet::flush_queries() {
const btCollisionObjectArray &colObjArray = dynamicsWorld->getCollisionObjectArray();
for (int i = colObjArray.size() - 1; 0 <= i; --i) {
static_cast<CollisionObjectBullet *>(colObjArray[i]->getUserPointer())->dispatch_callbacks();
}
}
void SpaceBullet::step(real_t p_delta_time) {
dynamicsWorld->stepSimulation(p_delta_time, 0, 0);
}
void SpaceBullet::set_param(PhysicsServer::AreaParameter p_param, const Variant &p_value) {
assert(dynamicsWorld);
switch (p_param) {
case PhysicsServer::AREA_PARAM_GRAVITY:
gravityMagnitude = p_value;
update_gravity();
break;
case PhysicsServer::AREA_PARAM_GRAVITY_VECTOR:
gravityDirection = p_value;
update_gravity();
break;
case PhysicsServer::AREA_PARAM_LINEAR_DAMP:
case PhysicsServer::AREA_PARAM_ANGULAR_DAMP:
break; // No damp
case PhysicsServer::AREA_PARAM_PRIORITY:
// Priority is always 0, the lower
break;
case PhysicsServer::AREA_PARAM_GRAVITY_IS_POINT:
case PhysicsServer::AREA_PARAM_GRAVITY_DISTANCE_SCALE:
case PhysicsServer::AREA_PARAM_GRAVITY_POINT_ATTENUATION:
break;
default:
WARN_PRINTS("This set parameter (" + itos(p_param) + ") is ignored, the SpaceBullet doesn't support it.");
break;
}
}
Variant SpaceBullet::get_param(PhysicsServer::AreaParameter p_param) {
switch (p_param) {
case PhysicsServer::AREA_PARAM_GRAVITY:
return gravityMagnitude;
case PhysicsServer::AREA_PARAM_GRAVITY_VECTOR:
return gravityDirection;
case PhysicsServer::AREA_PARAM_LINEAR_DAMP:
case PhysicsServer::AREA_PARAM_ANGULAR_DAMP:
return 0; // No damp
case PhysicsServer::AREA_PARAM_PRIORITY:
return 0; // Priority is always 0, the lower
case PhysicsServer::AREA_PARAM_GRAVITY_IS_POINT:
return false;
case PhysicsServer::AREA_PARAM_GRAVITY_DISTANCE_SCALE:
return 0;
case PhysicsServer::AREA_PARAM_GRAVITY_POINT_ATTENUATION:
return 0;
default:
WARN_PRINTS("This get parameter (" + itos(p_param) + ") is ignored, the SpaceBullet doesn't support it.");
return Variant();
}
}
void SpaceBullet::set_param(PhysicsServer::SpaceParameter p_param, real_t p_value) {
switch (p_param) {
case PhysicsServer::SPACE_PARAM_CONTACT_RECYCLE_RADIUS:
case PhysicsServer::SPACE_PARAM_CONTACT_MAX_SEPARATION:
case PhysicsServer::SPACE_PARAM_BODY_MAX_ALLOWED_PENETRATION:
case PhysicsServer::SPACE_PARAM_BODY_LINEAR_VELOCITY_SLEEP_THRESHOLD:
case PhysicsServer::SPACE_PARAM_BODY_ANGULAR_VELOCITY_SLEEP_THRESHOLD:
case PhysicsServer::SPACE_PARAM_BODY_TIME_TO_SLEEP:
case PhysicsServer::SPACE_PARAM_BODY_ANGULAR_VELOCITY_DAMP_RATIO:
case PhysicsServer::SPACE_PARAM_CONSTRAINT_DEFAULT_BIAS:
default:
WARN_PRINTS("This set parameter (" + itos(p_param) + ") is ignored, the SpaceBullet doesn't support it.");
break;
}
}
real_t SpaceBullet::get_param(PhysicsServer::SpaceParameter p_param) {
switch (p_param) {
case PhysicsServer::SPACE_PARAM_CONTACT_RECYCLE_RADIUS:
case PhysicsServer::SPACE_PARAM_CONTACT_MAX_SEPARATION:
case PhysicsServer::SPACE_PARAM_BODY_MAX_ALLOWED_PENETRATION:
case PhysicsServer::SPACE_PARAM_BODY_LINEAR_VELOCITY_SLEEP_THRESHOLD:
case PhysicsServer::SPACE_PARAM_BODY_ANGULAR_VELOCITY_SLEEP_THRESHOLD:
case PhysicsServer::SPACE_PARAM_BODY_TIME_TO_SLEEP:
case PhysicsServer::SPACE_PARAM_BODY_ANGULAR_VELOCITY_DAMP_RATIO:
case PhysicsServer::SPACE_PARAM_CONSTRAINT_DEFAULT_BIAS:
default:
WARN_PRINTS("The SpaceBullet doesn't support this get parameter (" + itos(p_param) + "), 0 is returned.");
return 0.f;
}
}
void SpaceBullet::add_area(AreaBullet *p_area) {
areas.push_back(p_area);
dynamicsWorld->addCollisionObject(p_area->get_bt_ghost(), p_area->get_collision_layer(), p_area->get_collision_mask());
}
void SpaceBullet::remove_area(AreaBullet *p_area) {
areas.erase(p_area);
dynamicsWorld->removeCollisionObject(p_area->get_bt_ghost());
}
void SpaceBullet::reload_collision_filters(AreaBullet *p_area) {
// This is necessary to change collision filter
dynamicsWorld->removeCollisionObject(p_area->get_bt_ghost());
dynamicsWorld->addCollisionObject(p_area->get_bt_ghost(), p_area->get_collision_layer(), p_area->get_collision_mask());
}
void SpaceBullet::add_rigid_body(RigidBodyBullet *p_body) {
if (p_body->is_static()) {
dynamicsWorld->addCollisionObject(p_body->get_bt_rigid_body(), p_body->get_collision_layer(), p_body->get_collision_mask());
} else {
dynamicsWorld->addRigidBody(p_body->get_bt_rigid_body(), p_body->get_collision_layer(), p_body->get_collision_mask());
}
}
void SpaceBullet::remove_rigid_body(RigidBodyBullet *p_body) {
if (p_body->is_static()) {
dynamicsWorld->removeCollisionObject(p_body->get_bt_rigid_body());
} else {
dynamicsWorld->removeRigidBody(p_body->get_bt_rigid_body());
}
}
void SpaceBullet::reload_collision_filters(RigidBodyBullet *p_body) {
// This is necessary to change collision filter
remove_rigid_body(p_body);
add_rigid_body(p_body);
}
void SpaceBullet::add_soft_body(SoftBodyBullet *p_body) {
if (is_using_soft_world()) {
if (p_body->get_bt_soft_body()) {
static_cast<btSoftRigidDynamicsWorld *>(dynamicsWorld)->addSoftBody(p_body->get_bt_soft_body(), p_body->get_collision_layer(), p_body->get_collision_mask());
}
} else {
ERR_PRINT("This soft body can't be added to non soft world");
}
}
void SpaceBullet::remove_soft_body(SoftBodyBullet *p_body) {
if (is_using_soft_world()) {
if (p_body->get_bt_soft_body()) {
static_cast<btSoftRigidDynamicsWorld *>(dynamicsWorld)->removeSoftBody(p_body->get_bt_soft_body());
}
}
}
void SpaceBullet::reload_collision_filters(SoftBodyBullet *p_body) {
// This is necessary to change collision filter
remove_soft_body(p_body);
add_soft_body(p_body);
}
void SpaceBullet::add_constraint(ConstraintBullet *p_constraint, bool disableCollisionsBetweenLinkedBodies) {
p_constraint->set_space(this);
dynamicsWorld->addConstraint(p_constraint->get_bt_constraint(), disableCollisionsBetweenLinkedBodies);
}
void SpaceBullet::remove_constraint(ConstraintBullet *p_constraint) {
dynamicsWorld->removeConstraint(p_constraint->get_bt_constraint());
}
int SpaceBullet::get_num_collision_objects() const {
return dynamicsWorld->getNumCollisionObjects();
}
void SpaceBullet::remove_all_collision_objects() {
for (int i = dynamicsWorld->getNumCollisionObjects() - 1; 0 <= i; --i) {
btCollisionObject *btObj = dynamicsWorld->getCollisionObjectArray()[i];
CollisionObjectBullet *colObj = static_cast<CollisionObjectBullet *>(btObj->getUserPointer());
colObj->set_space(NULL);
}
}
void onBulletPreTickCallback(btDynamicsWorld *p_dynamicsWorld, btScalar timeStep) {
static_cast<SpaceBullet *>(p_dynamicsWorld->getWorldUserInfo())->flush_queries();
}
void onBulletTickCallback(btDynamicsWorld *p_dynamicsWorld, btScalar timeStep) {
// Notify all Collision objects the collision checker is started
const btCollisionObjectArray &colObjArray = p_dynamicsWorld->getCollisionObjectArray();
for (int i = colObjArray.size() - 1; 0 <= i; --i) {
CollisionObjectBullet *colObj = static_cast<CollisionObjectBullet *>(colObjArray[i]->getUserPointer());
assert(NULL != colObj);
colObj->on_collision_checker_start();
}
SpaceBullet *sb = static_cast<SpaceBullet *>(p_dynamicsWorld->getWorldUserInfo());
sb->check_ghost_overlaps();
sb->check_body_collision();
}
BulletPhysicsDirectSpaceState *SpaceBullet::get_direct_state() {
return direct_access;
}
btScalar calculateGodotCombinedRestitution(const btCollisionObject *body0, const btCollisionObject *body1) {
return MAX(body0->getRestitution(), body1->getRestitution());
}
void SpaceBullet::create_empty_world(bool p_create_soft_world) {
gjk_epa_pen_solver = bulletnew(btGjkEpaPenetrationDepthSolver);
gjk_simplex_solver = bulletnew(btVoronoiSimplexSolver);
gjk_simplex_solver->setEqualVertexThreshold(0.f);
void *world_mem;
if (p_create_soft_world) {
world_mem = malloc(sizeof(btSoftRigidDynamicsWorld));
} else {
world_mem = malloc(sizeof(btDiscreteDynamicsWorld));
}
if (p_create_soft_world) {
collisionConfiguration = bulletnew(btSoftBodyRigidBodyCollisionConfiguration);
} else {
collisionConfiguration = bulletnew(GodotCollisionConfiguration(static_cast<btDiscreteDynamicsWorld *>(world_mem)));
}
dispatcher = bulletnew(GodotCollisionDispatcher(collisionConfiguration));
broadphase = bulletnew(btDbvtBroadphase);
solver = bulletnew(btSequentialImpulseConstraintSolver);
if (p_create_soft_world) {
dynamicsWorld = new (world_mem) btSoftRigidDynamicsWorld(dispatcher, broadphase, solver, collisionConfiguration);
soft_body_world_info = bulletnew(btSoftBodyWorldInfo);
} else {
dynamicsWorld = new (world_mem) btDiscreteDynamicsWorld(dispatcher, broadphase, solver, collisionConfiguration);
}
ghostPairCallback = bulletnew(btGhostPairCallback);
godotFilterCallback = bulletnew(GodotFilterCallback);
gCalculateCombinedRestitutionCallback = &calculateGodotCombinedRestitution;
dynamicsWorld->setWorldUserInfo(this);
dynamicsWorld->setInternalTickCallback(onBulletPreTickCallback, this, true);
dynamicsWorld->setInternalTickCallback(onBulletTickCallback, this, false);
dynamicsWorld->getBroadphase()->getOverlappingPairCache()->setInternalGhostPairCallback(ghostPairCallback); // Setup ghost check
dynamicsWorld->getPairCache()->setOverlapFilterCallback(godotFilterCallback);
if (soft_body_world_info) {
soft_body_world_info->m_broadphase = broadphase;
soft_body_world_info->m_dispatcher = dispatcher;
soft_body_world_info->m_sparsesdf.Initialize();
}
update_gravity();
}
void SpaceBullet::destroy_world() {
/// The world elements (like: Collision Objects, Constraints, Shapes) are managed by godot
dynamicsWorld->getBroadphase()->getOverlappingPairCache()->setInternalGhostPairCallback(NULL);
dynamicsWorld->getPairCache()->setOverlapFilterCallback(NULL);
bulletdelete(ghostPairCallback);
bulletdelete(godotFilterCallback);
// Deallocate world
dynamicsWorld->~btDiscreteDynamicsWorld();
free(dynamicsWorld);
dynamicsWorld = NULL;
bulletdelete(solver);
bulletdelete(broadphase);
bulletdelete(dispatcher);
bulletdelete(collisionConfiguration);
bulletdelete(soft_body_world_info);
bulletdelete(gjk_simplex_solver);
bulletdelete(gjk_epa_pen_solver);
}
void SpaceBullet::check_ghost_overlaps() {
/// Algorith support variables
btConvexShape *other_body_shape;
btConvexShape *area_shape;
btGjkPairDetector::ClosestPointInput gjk_input;
AreaBullet *area;
RigidCollisionObjectBullet *otherObject;
int x(-1), i(-1), y(-1), z(-1), indexOverlap(-1);
/// For each areas
for (x = areas.size() - 1; 0 <= x; --x) {
area = areas[x];
if (!area->is_monitoring())
continue;
/// 1. Reset all states
for (i = area->overlappingObjects.size() - 1; 0 <= i; --i) {
AreaBullet::OverlappingObjectData &otherObj = area->overlappingObjects[i];
// This check prevent the overwrite of ENTER state
// if this function is called more times before dispatchCallbacks
if (otherObj.state != AreaBullet::OVERLAP_STATE_ENTER) {
otherObj.state = AreaBullet::OVERLAP_STATE_DIRTY;
}
}
/// 2. Check all overlapping objects using GJK
const btAlignedObjectArray<btCollisionObject *> ghostOverlaps = area->get_bt_ghost()->getOverlappingPairs();
// For each overlapping
for (i = ghostOverlaps.size() - 1; 0 <= i; --i) {
if (!(ghostOverlaps[i]->getUserIndex() == CollisionObjectBullet::TYPE_RIGID_BODY || ghostOverlaps[i]->getUserIndex() == CollisionObjectBullet::TYPE_AREA))
continue;
otherObject = static_cast<RigidCollisionObjectBullet *>(ghostOverlaps[i]->getUserPointer());
bool hasOverlap = false;
// For each area shape
for (y = area->get_compound_shape()->getNumChildShapes() - 1; 0 <= y; --y) {
if (!area->get_compound_shape()->getChildShape(y)->isConvex())
continue;
gjk_input.m_transformA = area->get_transform__bullet() * area->get_compound_shape()->getChildTransform(y);
area_shape = static_cast<btConvexShape *>(area->get_compound_shape()->getChildShape(y));
// For each other object shape
for (z = otherObject->get_compound_shape()->getNumChildShapes() - 1; 0 <= z; --z) {
if (!otherObject->get_compound_shape()->getChildShape(z)->isConvex())
continue;
other_body_shape = static_cast<btConvexShape *>(otherObject->get_compound_shape()->getChildShape(z));
gjk_input.m_transformB = otherObject->get_transform__bullet() * otherObject->get_compound_shape()->getChildTransform(z);
btPointCollector result;
btGjkPairDetector gjk_pair_detector(area_shape, other_body_shape, gjk_simplex_solver, gjk_epa_pen_solver);
gjk_pair_detector.getClosestPoints(gjk_input, result, 0);
if (0 >= result.m_distance) {
hasOverlap = true;
goto collision_found;
}
} // ~For each other object shape
} // ~For each area shape
collision_found:
if (!hasOverlap)
continue;
indexOverlap = area->find_overlapping_object(otherObject);
if (-1 == indexOverlap) {
// Not found
area->add_overlap(otherObject);
} else {
// Found
area->put_overlap_as_inside(indexOverlap);
}
}
/// 3. Remove not overlapping
for (i = area->overlappingObjects.size() - 1; 0 <= i; --i) {
// If the overlap has DIRTY state it means that it's no more overlapping
if (area->overlappingObjects[i].state == AreaBullet::OVERLAP_STATE_DIRTY) {
area->put_overlap_as_exit(i);
}
}
}
}
void SpaceBullet::check_body_collision() {
#ifdef DEBUG_ENABLED
reset_debug_contact_count();
#endif
const int numManifolds = dynamicsWorld->getDispatcher()->getNumManifolds();
for (int i = 0; i < numManifolds; ++i) {
btPersistentManifold *contactManifold = dynamicsWorld->getDispatcher()->getManifoldByIndexInternal(i);
// I know this static cast is a bit risky. But I'm checking its type just after it.
// This allow me to avoid a lot of other cast and checks
RigidBodyBullet *bodyA = static_cast<RigidBodyBullet *>(contactManifold->getBody0()->getUserPointer());
RigidBodyBullet *bodyB = static_cast<RigidBodyBullet *>(contactManifold->getBody1()->getUserPointer());
if (CollisionObjectBullet::TYPE_RIGID_BODY == bodyA->getType() && CollisionObjectBullet::TYPE_RIGID_BODY == bodyB->getType()) {
if (!bodyA->can_add_collision() && !bodyB->can_add_collision()) {
continue;
}
const int numContacts = contactManifold->getNumContacts();
#define REPORT_ALL_CONTACTS 0
#if REPORT_ALL_CONTACTS
for (int j = 0; j < numContacts; j++) {
btManifoldPoint &pt = contactManifold->getContactPoint(j);
#else
// Since I don't need report all contacts for these objects, I'll report only the first
if (numContacts) {
btManifoldPoint &pt = contactManifold->getContactPoint(0);
#endif
Vector3 collisionWorldPosition;
Vector3 collisionLocalPosition;
Vector3 normalOnB;
B_TO_G(pt.m_normalWorldOnB, normalOnB);
if (bodyA->can_add_collision()) {
B_TO_G(pt.getPositionWorldOnB(), collisionWorldPosition);
/// pt.m_localPointB Doesn't report the exact point in local space
B_TO_G(pt.getPositionWorldOnB() - contactManifold->getBody1()->getWorldTransform().getOrigin(), collisionLocalPosition);
bodyA->add_collision_object(bodyB, collisionWorldPosition, collisionLocalPosition, normalOnB, pt.m_index1, pt.m_index0);
}
if (bodyB->can_add_collision()) {
B_TO_G(pt.getPositionWorldOnA(), collisionWorldPosition);
/// pt.m_localPointA Doesn't report the exact point in local space
B_TO_G(pt.getPositionWorldOnA() - contactManifold->getBody0()->getWorldTransform().getOrigin(), collisionLocalPosition);
bodyB->add_collision_object(bodyA, collisionWorldPosition, collisionLocalPosition, normalOnB * -1, pt.m_index0, pt.m_index1);
}
#ifdef DEBUG_ENABLED
if (is_debugging_contacts()) {
add_debug_contact(collisionWorldPosition);
}
#endif
}
}
}
}
void SpaceBullet::update_gravity() {
btVector3 btGravity;
G_TO_B(gravityDirection * gravityMagnitude, btGravity);
dynamicsWorld->setGravity(btGravity);
if (soft_body_world_info) {
soft_body_world_info->m_gravity = btGravity;
}
}
/// IMPORTANT: Please don't turn it ON this is not managed correctly!!
/// I'm leaving this here just for future tests.
/// Debug motion and normal vector drawing
#define debug_test_motion 0
#define PERFORM_INITIAL_UNSTACK 1
#if debug_test_motion
#include "scene/3d/immediate_geometry.h"
static ImmediateGeometry *motionVec(NULL);
static ImmediateGeometry *normalLine(NULL);
static Ref<SpatialMaterial> red_mat;
static Ref<SpatialMaterial> blue_mat;
#endif
#define IGNORE_AREAS_TRUE true
bool SpaceBullet::test_body_motion(RigidBodyBullet *p_body, const Transform &p_from, const Vector3 &p_motion, PhysicsServer::MotionResult *r_result) {
#if debug_test_motion
/// Yes I know this is not good, but I've used it as fast debugging hack.
/// I'm leaving it here just for speedup the other eventual debugs
if (!normalLine) {
motionVec = memnew(ImmediateGeometry);
normalLine = memnew(ImmediateGeometry);
SceneTree::get_singleton()->get_current_scene()->add_child(motionVec);
SceneTree::get_singleton()->get_current_scene()->add_child(normalLine);
red_mat = Ref<SpatialMaterial>(memnew(SpatialMaterial));
red_mat->set_flag(SpatialMaterial::FLAG_UNSHADED, true);
red_mat->set_line_width(20.0);
red_mat->set_feature(SpatialMaterial::FEATURE_TRANSPARENT, true);
red_mat->set_flag(SpatialMaterial::FLAG_ALBEDO_FROM_VERTEX_COLOR, true);
red_mat->set_flag(SpatialMaterial::FLAG_SRGB_VERTEX_COLOR, true);
red_mat->set_albedo(Color(1, 0, 0, 1));
motionVec->set_material_override(red_mat);
blue_mat = Ref<SpatialMaterial>(memnew(SpatialMaterial));
blue_mat->set_flag(SpatialMaterial::FLAG_UNSHADED, true);
blue_mat->set_line_width(20.0);
blue_mat->set_feature(SpatialMaterial::FEATURE_TRANSPARENT, true);
blue_mat->set_flag(SpatialMaterial::FLAG_ALBEDO_FROM_VERTEX_COLOR, true);
blue_mat->set_flag(SpatialMaterial::FLAG_SRGB_VERTEX_COLOR, true);
blue_mat->set_albedo(Color(0, 0, 1, 1));
normalLine->set_material_override(blue_mat);
}
#endif
///// Release all generated manifolds
//{
// if(p_body->get_kinematic_utilities()){
// for(int i= p_body->get_kinematic_utilities()->m_generatedManifold.size()-1; 0<=i; --i){
// dispatcher->releaseManifold( p_body->get_kinematic_utilities()->m_generatedManifold[i] );
// }
// p_body->get_kinematic_utilities()->m_generatedManifold.clear();
// }
//}
btVector3 recover_initial_position(0, 0, 0);
btTransform body_safe_position;
G_TO_B(p_from, body_safe_position);
{ /// Phase one - multi shapes depenetration using margin
#if PERFORM_INITIAL_UNSTACK
if (recover_from_penetration(p_body, body_safe_position, recover_initial_position)) {
// Add recover position to "From" and "To" transforms
body_safe_position.getOrigin() += recover_initial_position;
}
#endif
}
btVector3 recovered_motion;
G_TO_B(p_motion, recovered_motion);
const int shape_count(p_body->get_shape_count());
{ /// phase two - sweep test, from a secure position without margin
#if debug_test_motion
Vector3 sup_line;
B_TO_G(body_safe_position.getOrigin(), sup_line);
motionVec->clear();
motionVec->begin(Mesh::PRIMITIVE_LINES, NULL);
motionVec->add_vertex(sup_line);
motionVec->add_vertex(sup_line + p_motion * 10);
motionVec->end();
#endif
for (int shIndex = 0; shIndex < shape_count; ++shIndex) {
if (p_body->is_shape_disabled(shIndex)) {
continue;
}
btConvexShape *convex_shape_test(dynamic_cast<btConvexShape *>(p_body->get_bt_shape(shIndex)));
if (!convex_shape_test) {
// Skip no convex shape
continue;
}
btTransform shape_world_from;
G_TO_B(p_body->get_shape_transform(shIndex), shape_world_from);
// Add local shape transform
shape_world_from = body_safe_position * shape_world_from;
btTransform shape_world_to(shape_world_from);
shape_world_to.getOrigin() += recovered_motion;
GodotKinClosestConvexResultCallback btResult(shape_world_from.getOrigin(), shape_world_to.getOrigin(), p_body, IGNORE_AREAS_TRUE);
btResult.m_collisionFilterGroup = p_body->get_collision_layer();
btResult.m_collisionFilterMask = p_body->get_collision_mask();
dynamicsWorld->convexSweepTest(convex_shape_test, shape_world_from, shape_world_to, btResult, 0.002);
if (btResult.hasHit()) {
/// Since for each sweep test I fix the motion of new shapes in base the recover result,
/// if another shape will hit something it means that has a deepest penetration respect the previous shape
recovered_motion *= btResult.m_closestHitFraction;
}
}
}
bool hasPenetration = false;
{ /// Phase three - Recover + contact test with margin
RecoverResult recover_result;
hasPenetration = recover_from_penetration(p_body, body_safe_position, recovered_motion, &recover_result);
if (r_result) {
B_TO_G(recovered_motion + recover_initial_position, r_result->motion);
if (hasPenetration) {
const btRigidBody *btRigid = static_cast<const btRigidBody *>(recover_result.other_collision_object);
CollisionObjectBullet *collisionObject = static_cast<CollisionObjectBullet *>(btRigid->getUserPointer());
r_result->remainder = p_motion - r_result->motion; // is the remaining movements
B_TO_G(recover_result.pointWorld, r_result->collision_point);
B_TO_G(recover_result.pointNormalWorld, r_result->collision_normal);
B_TO_G(btRigid->getVelocityInLocalPoint(recover_result.pointWorld - btRigid->getWorldTransform().getOrigin()), r_result->collider_velocity); // It calculates velocity at point and assign it using special function Bullet_to_Godot
r_result->collider = collisionObject->get_self();
r_result->collider_id = collisionObject->get_instance_id();
r_result->collider_shape = recover_result.other_compound_shape_index;
r_result->collision_local_shape = recover_result.local_shape_most_recovered;
//{ /// Add manifold point to manage collisions
// btPersistentManifold* manifold = dynamicsWorld->getDispatcher()->getNewManifold(p_body->getBtBody(), btRigid);
// btManifoldPoint manifoldPoint(result_callabck.m_pointWorld, result_callabck.m_pointWorld, result_callabck.m_pointNormalWorld, result_callabck.m_penetration_distance);
// manifoldPoint.m_index0 = r_result->collision_local_shape;
// manifoldPoint.m_index1 = r_result->collider_shape;
// manifold->addManifoldPoint(manifoldPoint);
// p_body->get_kinematic_utilities()->m_generatedManifold.push_back(manifold);
//}
#if debug_test_motion
Vector3 sup_line2;
B_TO_G(recovered_motion, sup_line2);
//Vector3 sup_pos;
//B_TO_G( pt.getPositionWorldOnB(), sup_pos);
normalLine->clear();
normalLine->begin(Mesh::PRIMITIVE_LINES, NULL);
normalLine->add_vertex(r_result->collision_point);
normalLine->add_vertex(r_result->collision_point + r_result->collision_normal * 10);
normalLine->end();
#endif
} else {
r_result->remainder = Vector3();
}
}
}
return hasPenetration;
}
struct RecoverPenetrationBroadPhaseCallback : public btBroadphaseAabbCallback {
private:
const btCollisionObject *self_collision_object;
uint32_t collision_layer;
uint32_t collision_mask;
public:
Vector<btCollisionObject *> result_collision_objects;
public:
RecoverPenetrationBroadPhaseCallback(const btCollisionObject *p_self_collision_object, uint32_t p_collision_layer, uint32_t p_collision_mask)
: self_collision_object(p_self_collision_object),
collision_layer(p_collision_layer),
collision_mask(p_collision_mask) {}
virtual ~RecoverPenetrationBroadPhaseCallback() {}
virtual bool process(const btBroadphaseProxy *proxy) {
btCollisionObject *co = static_cast<btCollisionObject *>(proxy->m_clientObject);
if (co->getInternalType() <= btCollisionObject::CO_RIGID_BODY) {
if (self_collision_object != proxy->m_clientObject && GodotFilterCallback::test_collision_filters(collision_layer, collision_mask, proxy->m_collisionFilterGroup, proxy->m_collisionFilterMask)) {
result_collision_objects.push_back(co);
return true;
}
}
return false;
}
void reset() {
result_collision_objects.empty();
}
};
bool SpaceBullet::recover_from_penetration(RigidBodyBullet *p_body, const btTransform &p_body_position, btVector3 &out_recover_position, RecoverResult *recover_result) {
RecoverPenetrationBroadPhaseCallback recover_broad_result(p_body->get_bt_collision_object(), p_body->get_collision_layer(), p_body->get_collision_mask());
btTransform body_shape_position;
btTransform body_shape_position_recovered;
// Broad phase support
btVector3 minAabb, maxAabb;
// GJK support
btGjkPairDetector::ClosestPointInput gjk_input;
bool penetration = false;
// For each shape
for (int kinIndex = p_body->get_kinematic_utilities()->shapes.size() - 1; 0 <= kinIndex; --kinIndex) {
recover_broad_result.reset();
const RigidBodyBullet::KinematicShape &kin_shape(p_body->get_kinematic_utilities()->shapes[kinIndex]);
if (!kin_shape.is_active()) {
continue;
}
body_shape_position = p_body_position * kin_shape.transform;
body_shape_position_recovered = body_shape_position;
body_shape_position_recovered.getOrigin() += out_recover_position;
kin_shape.shape->getAabb(body_shape_position_recovered, minAabb, maxAabb);
dynamicsWorld->getBroadphase()->aabbTest(minAabb, maxAabb, recover_broad_result);
for (int i = recover_broad_result.result_collision_objects.size() - 1; 0 <= i; --i) {
btCollisionObject *otherObject = recover_broad_result.result_collision_objects[i];
if (!p_body->get_bt_collision_object()->checkCollideWith(otherObject) || !otherObject->checkCollideWith(p_body->get_bt_collision_object()))
continue;
if (otherObject->getCollisionShape()->isCompound()) { /// Execute GJK test against all shapes
// Each convex shape
btCompoundShape *cs = static_cast<btCompoundShape *>(otherObject->getCollisionShape());
for (int x = cs->getNumChildShapes() - 1; 0 <= x; --x) {
if (!cs->getChildShape(x)->isConvex())
continue;
// Initialize GJK input
gjk_input.m_transformA = body_shape_position;
gjk_input.m_transformA.getOrigin() += out_recover_position;
gjk_input.m_transformB = otherObject->getWorldTransform() * cs->getChildTransform(x);
// Perform GJK test
btPointCollector result;
btGjkPairDetector gjk_pair_detector(kin_shape.shape, static_cast<const btConvexShape *>(cs->getChildShape(x)), gjk_simplex_solver, gjk_epa_pen_solver);
gjk_pair_detector.getClosestPoints(gjk_input, result, 0);
if (0 > result.m_distance) {
// Has penetration
out_recover_position += result.m_normalOnBInWorld * (result.m_distance * -1);
penetration = true;
if (recover_result) {
recover_result->hasPenetration = true;
recover_result->other_collision_object = otherObject;
recover_result->other_compound_shape_index = x;
recover_result->penetration_distance = result.m_distance;
recover_result->pointNormalWorld = result.m_normalOnBInWorld;
recover_result->pointWorld = result.m_pointInWorld;
}
}
}
} else if (otherObject->getCollisionShape()->isConvex()) { /// Execute GJK test against object shape
// Initialize GJK input
gjk_input.m_transformA = body_shape_position;
gjk_input.m_transformA.getOrigin() += out_recover_position;
gjk_input.m_transformB = otherObject->getWorldTransform();
// Perform GJK test
btPointCollector result;
btGjkPairDetector gjk_pair_detector(kin_shape.shape, static_cast<const btConvexShape *>(otherObject->getCollisionShape()), gjk_simplex_solver, gjk_epa_pen_solver);
gjk_pair_detector.getClosestPoints(gjk_input, result, 0);
if (0 > result.m_distance) {
// Has penetration
out_recover_position += result.m_normalOnBInWorld * (result.m_distance * -1);
penetration = true;
if (recover_result) {
recover_result->hasPenetration = true;
recover_result->other_collision_object = otherObject;
recover_result->other_compound_shape_index = 0;
recover_result->penetration_distance = result.m_distance;
recover_result->pointNormalWorld = result.m_normalOnBInWorld;
recover_result->pointWorld = result.m_pointInWorld;
}
}
}
}
}
return penetration;
}
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