GameObject * Factory::BuildJsonComposition(const char *file)
{
// Open the Json file and read in the components:
Json::Value components = GetJsonRoot(file)["Components"];
ErrorIf(!components, "Failed to open file %s.", file);
std::vector<std::string> componentList = components.getMemberNames();
GameObject *gameObject = new GameObject();
// Add each of the components to the new object:
for (unsigned i = 0; i < components.size(); ++i)
{
// 1. Check if the component is registered and has a creator
// in the component map:
ComponentCreatorMap::iterator it =
componentCreatorMap_.find(componentList.at(i));
ErrorIf(it == componentCreatorMap_.end(), "Failed to create unregistered component %s", componentList.at(i));
// 2. Create a new component once the creator is found in the
// map:
ComponentCreator *creator = it->second;
Component *component = creator->Create();
// 3. Serialize the component using the Json value in the file:
component->Deserialize(components[componentList.at(i)]);
// 4. Add the component to the composition:
gameObject->AddComponent(creator->TypeId, component);
}
IdGameObject(gameObject);
return gameObject;
}
// Called by the engine when the entity is spawned due to scene segment creation.
Result Entity::Deserialize(Common::InputStream* pStream, const Vector& offset)
{
if (!pStream)
return Result::CorruptedPointer;
EntityDesc desc;
size_t bytesRead = pStream->Read(sizeof(desc), &desc);
if (bytesRead != sizeof(desc))
{
if (bytesRead > 0)
{
LOG_ERROR("Could not deserialize entity.");
return Result::Error; //failed to read entity descriptor
}
else
{
// End of Stream. This sould be checked outside to aviod pointless Entity object creation.
return Result::Error;
}
}
// decode rotation matrix
mLocalMatrix = MatrixFromQuaternion(Vector(desc.quat));
// decode position
mLocalMatrix.r[3] = Vector(desc.pos) + offset;
mLocalMatrix.m[3][3] = 1.0f;
UpdateGlobalMatrix();
// deserialize components
for (uint16 i = 0; i < desc.compNum; i++)
{
char compType = 0;
if (pStream->Read(sizeof(compType), &compType) != sizeof(compType))
{
DebugBreak();
LOG_ERROR("Entity deserialization failed: invalid component type. Data could be corrupted.");
return Result::Error; //failed to component type
}
Component* pComponent = nullptr;
switch ((ComponentType)compType)
{
case ComponentType::Mesh:
pComponent = new MeshComponent(this);
break;
case ComponentType::Light:
pComponent = new LightComponent(this);
break;
case ComponentType::Physics:
pComponent = new BodyComponent(this);
break;
case ComponentType::Camera:
pComponent = new Camera(this);
break;
}
if (pComponent == nullptr)
{
LOG_ERROR("Entity deserialization failed: allocation error.");
return Result::AllocationError; //invalid component type
}
pComponent->Deserialize(pStream);
}
// deserialize children
for (uint16 i = 0; i < desc.childrenNum; i++)
{
Entity* pChild = nullptr;
if (mScene->DeserializeEntity(pStream, Vector(), &pChild) != Result::OK)
{
return Result::Error;
}
Attach(pChild);
}
return Result::OK;
}