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Fix some undefined behaviour in Bullet module.

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Nulling mainShape when it's deleted to avoid double free.
Initialising vector in inertia calculation to work around bug in bullet.
This commit is contained in:
Ibrahn Sahir 2018-11-16 14:20:09 +00:00
parent bb9127a78b
commit d1550215b0
2 changed files with 12 additions and 2 deletions
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9
modules/bullet/collision_object_bullet.cpp
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@ -304,7 +304,11 @@ bool RigidCollisionObjectBullet::is_shape_disabled(int p_index) {
}
void RigidCollisionObjectBullet::shape_changed(int p_shape_index) {
bulletdelete(shapes.write[p_shape_index].bt_shape);
ShapeWrapper &shp = shapes.write[p_shape_index];
if (shp.bt_shape == mainShape) {
mainShape = NULL;
}
bulletdelete(shp.bt_shape);
reload_shapes();
}
@ -366,5 +370,8 @@ void RigidCollisionObjectBullet::body_scale_changed() {
void RigidCollisionObjectBullet::internal_shape_destroy(int p_index, bool p_permanentlyFromThisBody) {
ShapeWrapper &shp = shapes.write[p_index];
shp.shape->remove_owner(this, p_permanentlyFromThisBody);
if (shp.bt_shape == mainShape) {
mainShape = NULL;
}
bulletdelete(shp.bt_shape);
}

5
modules/bullet/rigid_body_bullet.cpp
View File

@ -797,7 +797,10 @@ void RigidBodyBullet::reload_shapes() {
const btScalar mass = invMass == 0 ? 0 : 1 / invMass;
if (mainShape) {
btVector3 inertia;
// inertia initialised zero here because some of bullet's collision
// shapes incorrectly do not set the vector in calculateLocalIntertia.
// Arbitrary zero is preferable to undefined behaviour.
btVector3 inertia(0, 0, 0);
mainShape->calculateLocalInertia(mass, inertia);
btBody->setMassProps(mass, inertia);
}