implement setContactResponse(boolean) for PhysicsRigidBody (issue #964) (#966)

partial

jme3-bullet-native/src/native/cpp/com_jme3_bullet_collision_PhysicsCollisionObject.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009-2012 jMonkeyEngine
+ * Copyright (c) 2009-2018 jMonkeyEngine
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -143,6 +143,42 @@ extern "C" {
         }
     }
 
+    /*
+     * Class:     com_jme3_bullet_collision_PhysicsCollisionObject
+     * Method:    getCollisionFlags
+     * Signature: (J)I
+     */
+    JNIEXPORT jint JNICALL Java_com_jme3_bullet_collision_PhysicsCollisionObject_getCollisionFlags
+    (JNIEnv *env, jobject object, jlong objectId) {
+        btCollisionObject* collisionObject = reinterpret_cast<btCollisionObject*> (objectId);
+        if (collisionObject == NULL) {
+            jclass newExc = env->FindClass("java/lang/NullPointerException");
+            env->ThrowNew(newExc, "The native object does not exist.");
+            return 0;
+        }
+
+        jint result = collisionObject->getCollisionFlags();
+        return result;
+    }
+
+    /*
+     * Class:     com_jme3_bullet_collision_PhysicsCollisionObject
+     * Method:    setCollisionFlags
+     * Signature: (JI)V
+     */
+    JNIEXPORT void JNICALL Java_com_jme3_bullet_collision_PhysicsCollisionObject_setCollisionFlags
+    (JNIEnv *env, jobject object, jlong objectId, jint desiredFlags) {
+        btCollisionObject* collisionObject = reinterpret_cast<btCollisionObject*> (objectId);
+        if (collisionObject == NULL) {
+            jclass newExc = env->FindClass("java/lang/NullPointerException");
+            env->ThrowNew(newExc, "The native object does not exist.");
+            return;
+        }
+
+        collisionObject->setCollisionFlags(desiredFlags);
+    }
+
+
 #ifdef __cplusplus
 }
 #endif

jme3-bullet/src/common/java/com/jme3/bullet/control/RigidBodyControl.java

@@ -150,6 +150,7 @@ public class RigidBodyControl extends PhysicsRigidBody implements PhysicsControl
         control.setCcdSweptSphereRadius(getCcdSweptSphereRadius());
         control.setCollideWithGroups(getCollideWithGroups());
         control.setCollisionGroup(getCollisionGroup());
+        control.setContactResponse(isContactResponse());
         control.setDamping(getLinearDamping(), getAngularDamping());
         control.setFriction(getFriction());
         control.setGravity(getGravity());

jme3-bullet/src/common/java/com/jme3/bullet/control/VehicleControl.java

@@ -168,6 +168,7 @@ public class VehicleControl extends PhysicsVehicle implements PhysicsControl, Jm
         control.setCcdSweptSphereRadius(getCcdSweptSphereRadius());
         control.setCollideWithGroups(getCollideWithGroups());
         control.setCollisionGroup(getCollisionGroup());
+        control.setContactResponse(isContactResponse());
         control.setDamping(getLinearDamping(), getAngularDamping());
         control.setFriction(getFriction());
         control.setGravity(getGravity());

jme3-bullet/src/main/java/com/jme3/bullet/collision/CollisionFlag.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2018 jMonkeyEngine
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
+ *   may be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.jme3.bullet.collision;
+
+/**
+ * Named collision flags for a {@link PhysicsCollisionObject}. Values must agree
+ * with those in BulletCollision/CollisionDispatch/btCollisionObject.h
+ *
+ * @author Stephen Gold sgold@sonic.net
+ * @see PhysicsCollisionObject#getCollisionFlags(long)
+ */
+public class CollisionFlag {
+    /**
+     * flag for a static object
+     */
+    final public static int STATIC_OBJECT = 0x1;
+    /**
+     * flag for a kinematic object
+     */
+    final public static int KINEMATIC_OBJECT = 0x2;
+    /**
+     * flag for an object with no contact response, such as a PhysicsGhostObject
+     */
+    final public static int NO_CONTACT_RESPONSE = 0x4;
+    /**
+     * flag to enable a custom material callback for per-triangle
+     * friction/restitution (not used by JME)
+     */
+    final public static int CUSTOM_MATERIAL_CALLBACK = 0x8;
+    /**
+     * flag for a character object, such as a PhysicsCharacter
+     */
+    final public static int CHARACTER_OBJECT = 0x10;
+    /**
+     * flag to disable debug visualization (not used by JME)
+     */
+    final public static int DISABLE_VISUALIZE_OBJECT = 0x20;
+    /**
+     * flag to disable parallel/SPU processing (not used by JME)
+     */
+    final public static int DISABLE_SPU_COLLISION_PROCESSING = 0x40;
+    /**
+     * flag not used by JME
+     */
+    final public static int HAS_CONTACT_STIFFNESS_DAMPING = 0x80;
+    /**
+     * flag not used by JME
+     */
+    final public static int HAS_CUSTOM_DEBUG_RENDERING_COLOR = 0x100;
+    /**
+     * flag not used by JME
+     */
+    final public static int HAS_FRICTION_ANCHOR = 0x200;
+    /**
+     * flag not used by JME
+     */
+    final public static int HAS_COLLISION_SOUND_TRIGGER = 0x400;
+}

jme3-bullet/src/main/java/com/jme3/bullet/collision/PhysicsCollisionObject.java

@@ -254,6 +254,17 @@ public abstract class PhysicsCollisionObject implements Savable {
         return userObject;
     }
 
+    /**
+     * Test whether this object responds to contact with other objects.
+     *
+     * @return true if responsive, otherwise false
+     */
+    public boolean isContactResponse() {
+        int flags = getCollisionFlags(objectId);
+        boolean result = (flags & CollisionFlag.NO_CONTACT_RESPONSE) == 0x0;
+        return result;
+    }
+
     /**
      * Associate a user object (such as a Spatial) with this collision object.
      *
@@ -314,6 +325,24 @@ public abstract class PhysicsCollisionObject implements Savable {
         collisionShape = shape;
     }
 
+    /**
+     * Read the collision flags of this object. Subclasses are responsible for
+     * cloning/reading/writing these flags.
+     *
+     * @param objectId the ID of the btCollisionObject (not zero)
+     * @return the collision flags (bit mask)
+     */
+    native protected int getCollisionFlags(long objectId);
+
+    /**
+     * Alter the collision flags of this object. Subclasses are responsible for
+     * cloning/reading/writing these flags.
+     *
+     * @param objectId the ID of the btCollisionObject (not zero)
+     * @param desiredFlags the desired collision flags (bit mask)
+     */
+    native protected void setCollisionFlags(long objectId, int desiredFlags);
+
     /**
      * Finalize this collision object just before it is destroyed. Should be
      * invoked only by a subclass or by the garbage collector.

jme3-bullet/src/main/java/com/jme3/bullet/objects/PhysicsRigidBody.java

@@ -32,6 +32,7 @@
 package com.jme3.bullet.objects;
 
 import com.jme3.bullet.PhysicsSpace;
+import com.jme3.bullet.collision.CollisionFlag;
 import com.jme3.bullet.collision.PhysicsCollisionObject;
 import com.jme3.bullet.collision.shapes.CollisionShape;
 import com.jme3.bullet.collision.shapes.MeshCollisionShape;
@@ -57,6 +58,11 @@ import java.util.logging.Logger;
  */
 public class PhysicsRigidBody extends PhysicsCollisionObject {
 
+    /**
+     * copy of the contact response state: true→responds to contacts,
+     * false→doesn't respond (default=true)
+     */
+    private boolean contactResponseState = true;
     /**
      * motion state
      */
@@ -370,6 +376,24 @@ public class PhysicsRigidBody extends PhysicsCollisionObject {
         return kinematic;
     }
 
+    /**
+     * Enable/disable this body's contact response.
+     *
+     * @param responsive true to respond to contacts, false to ignore them
+     * (default=true)
+     */
+    public void setContactResponse(boolean responsive) {
+        int flags = getCollisionFlags(objectId);
+        if (responsive) {
+            flags &= ~CollisionFlag.NO_CONTACT_RESPONSE;
+        } else {
+            flags |= CollisionFlag.NO_CONTACT_RESPONSE;
+        }
+        setCollisionFlags(objectId, flags);
+
+        contactResponseState = responsive;
+    }
+
     /**
      * Alter the radius of the swept sphere used for continuous collision
      * detection (CCD).
@@ -993,6 +1017,7 @@ public class PhysicsRigidBody extends PhysicsCollisionObject {
         capsule.write(getMass(), "mass", 1.0f);
 
         capsule.write(getGravity(), "gravity", Vector3f.ZERO);
+        capsule.write(isContactResponse(), "contactResponse", true);
         capsule.write(getFriction(), "friction", 0.5f);
         capsule.write(getRestitution(), "restitution", 0);
         Vector3f angularFactor = getAngularFactor(null);
@@ -1033,6 +1058,7 @@ public class PhysicsRigidBody extends PhysicsCollisionObject {
         this.mass = mass;
         rebuildRigidBody();
         setGravity((Vector3f) capsule.readSavable("gravity", Vector3f.ZERO.clone()));
+        setContactResponse(capsule.readBoolean("contactResponse", true));
         setFriction(capsule.readFloat("friction", 0.5f));
         setKinematic(capsule.readBoolean("kinematic", false));
 

jme3-jbullet/src/main/java/com/jme3/bullet/objects/PhysicsRigidBody.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009-2012 jMonkeyEngine
+ * Copyright (c) 2009-2018 jMonkeyEngine
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -276,6 +276,26 @@ public class PhysicsRigidBody extends PhysicsCollisionObject {
         return kinematic;
     }
 
+    /**
+     * Enable/disable this body's contact response.
+     *
+     * @param newState true to respond to contacts (default=true)
+     */
+    public void setContactResponse(boolean newState) {
+        if (!newState) {
+            throw new UnsupportedOperationException("Not implemented.");
+        }
+    }
+
+    /**
+     * Test whether this body responds to contacts.
+     *
+     * @return true if responsive, otherwise false
+     */
+    public boolean isContactResponse() {
+        return true;
+    }
+
     public void setCcdSweptSphereRadius(float radius) {
         rBody.setCcdSweptSphereRadius(radius);
     }
@@ -650,6 +670,7 @@ public class PhysicsRigidBody extends PhysicsCollisionObject {
         this.mass = mass;
         rebuildRigidBody();
         setGravity((Vector3f) capsule.readSavable("gravity", Vector3f.ZERO.clone()));
+        setContactResponse(capsule.readBoolean("contactResponse", true));
         setFriction(capsule.readFloat("friction", 0.5f));
         setKinematic(capsule.readBoolean("kinematic", false));