Add area and flag on physics

test/physics/test_physicsworld.c

@@ -191,6 +191,49 @@ static void test_physicsWorldDynamicVsDynamicSeparates(void **state) {
   assert_int_equal(memoryGetAllocatedCount(), 0);
 }
 
+static void test_physicsWorldCollideMaskPreventsCollision(void **state) {
+  entitymanager_t mgr;
+  entityManagerInit(&mgr);
+  physicsworld_t world;
+  physicsWorldInit(&world);
+
+  entityid_t entityA = entityManagerAdd(&mgr);
+  componentid_t posA = entityAddComponent(
+    &mgr, entityA, COMPONENT_TYPE_POSITION
+  );
+  componentid_t physA = entityAddComponent(
+    &mgr, entityA, COMPONENT_TYPE_PHYSICS
+  );
+  vec3 posAStart = { 0.0f, 0.0f, 0.3f };
+  entityPositionSetLocalPosition(&mgr, entityA, posA, posAStart);
+  entityPhysicsGet(&mgr, entityA, physA)->gravityScale = 0.0f;
+  entityPhysicsSetCollideMask(&mgr, entityA, physA, 0x1);
+
+  entityid_t entityB = entityManagerAdd(&mgr);
+  componentid_t posB = entityAddComponent(
+    &mgr, entityB, COMPONENT_TYPE_POSITION
+  );
+  componentid_t physB = entityAddComponent(
+    &mgr, entityB, COMPONENT_TYPE_PHYSICS
+  );
+  vec3 posBStart = { 0.0f, 0.0f, -0.3f };
+  entityPositionSetLocalPosition(&mgr, entityB, posB, posBStart);
+  entityPhysicsGet(&mgr, entityB, physB)->gravityScale = 0.0f;
+  entityPhysicsSetCollideMask(&mgr, entityB, physB, 0x2);
+
+  // Overlapping by 0.4 on Z, but masks share no bits -- no separation.
+  physicsWorldStep(&world, &mgr, 1.0f / 60.0f);
+
+  vec3 finalA, finalB;
+  entityPositionGetWorldPosition(&mgr, entityA, posA, finalA);
+  entityPositionGetWorldPosition(&mgr, entityB, posB, finalB);
+  assert_float_equal(finalA[2], posAStart[2], 0.0001f);
+  assert_float_equal(finalB[2], posBStart[2], 0.0001f);
+
+  entityManagerDispose(&mgr);
+  assert_int_equal(memoryGetAllocatedCount(), 0);
+}
+
 static void test_physicsWorldStepNoPhysicsEntitiesIsNoop(void **state) {
   entitymanager_t mgr;
   entityManagerInit(&mgr);
@@ -210,6 +253,7 @@ int main(int argc, char **argv) {
     cmocka_unit_test(test_physicsWorldGravityIntegratesDynamicBody),
     cmocka_unit_test(test_physicsWorldRestsOnStaticFloor),
     cmocka_unit_test(test_physicsWorldDynamicVsDynamicSeparates),
+    cmocka_unit_test(test_physicsWorldCollideMaskPreventsCollision),
     cmocka_unit_test(test_physicsWorldStepNoPhysicsEntitiesIsNoop),
   };