/// <summary>
/// Note: unluckily I didn't design the serialization system to be component order independent, so unless
/// I do something about it, this method cannot be optimized, the logic of the component order must stay
/// untouched (no reordering, no use of dictionaries). Components order must stay as it comes, as
/// well as extracomponents order.
/// Speed, however, is not a big issue for this class, as the data is always composed once per entity descriptor
/// at static constructor time
/// </summary>
/// <returns></returns>
IComponentBuilder[] Construct(int extraComponentsLength, IComponentBuilder[] extraComponents)
{
IComponentBuilder[] MergeLists
(IComponentBuilder[] startingComponents, IComponentBuilder[] newComponents, int newComponentsLength)
{
var startComponents =
new FasterDictionary <RefWrapper <IComponentBuilder, ComponentBuilderComparer>, IComponentBuilder>();
var xtraComponents =
new FasterDictionary <RefWrapper <IComponentBuilder, ComponentBuilderComparer>, IComponentBuilder>();
for (uint i = 0; i < startingComponents.Length; i++)
{
startComponents
[new RefWrapper <IComponentBuilder, ComponentBuilderComparer>(startingComponents[i])] =
startingComponents[i];
}
for (uint i = 0; i < newComponentsLength; i++)
{
xtraComponents[new RefWrapper <IComponentBuilder, ComponentBuilderComparer>(newComponents[i])] =
newComponents[i];
}
xtraComponents.Exclude(startComponents);
if (newComponentsLength != xtraComponents.count)
{
newComponentsLength = xtraComponents.count;
uint index = 0;
foreach (var couple in xtraComponents)
{
newComponents[index++] = couple.key.type;
}
}
IComponentBuilder[] componentBuilders =
new IComponentBuilder[newComponentsLength + startingComponents.Length];
Array.Copy(startingComponents, 0, componentBuilders, 0, startingComponents.Length);
Array.Copy(newComponents, 0, componentBuilders, startingComponents.Length, newComponentsLength);
var entityInfoComponentIndex = FetchEntityInfoComponent(componentBuilders);
DBC.ECS.Check.Assert(entityInfoComponentIndex != -1);
componentBuilders[entityInfoComponentIndex] = new ComponentBuilder <EntityInfoComponent>(
new EntityInfoComponent
{
componentsToBuild = componentBuilders
});
return(componentBuilders);
}
if (extraComponentsLength == 0)
{
return(_componentsToBuild);
}
var safeCopyOfExtraComponents = new IComponentBuilder[extraComponentsLength];
Array.Copy(extraComponents, safeCopyOfExtraComponents, extraComponentsLength);
return(MergeLists(_componentsToBuild, safeCopyOfExtraComponents, extraComponentsLength));
}
internal static void SetEntityViewComponentImplementors <T>(this IComponentBuilder componentBuilder,
ref T entityComponent, IEnumerable <object> implementors,
ComponentBuilder <T> .EntityViewComponentCache localCache) where T : struct, IBaseEntityComponent
{
DBC.ECS.Check.Require(implementors != null,
NULL_IMPLEMENTOR_ERROR.FastConcat(" entityComponent ",
componentBuilder.GetEntityComponentType().ToString()));
var cachedTypeInterfaces = localCache.cachedTypes;
var implementorsByType = localCache.implementorsByType;
var entityComponentBlazingFastReflection = localCache.cachedFields;
foreach (var implementor in implementors)
{
DBC.ECS.Check.Require(implementor != null, "invalid null implementor used to build an entity");
{
var type = implementor.GetType();
//fetch all the interfaces that the implementor implements
if (cachedTypeInterfaces.TryGetValue(type, out var interfaces) == false)
{
interfaces = cachedTypeInterfaces[type] = type.GetInterfacesEx();
}
for (var iindex = 0; iindex < interfaces.Length; iindex++)
{
var componentType = interfaces[iindex];
//an implementor can implement multiple interfaces, so for each interface we reference
//the implementation object. Multiple entity view component fields can then be implemented
//by the same implementor
#if DEBUG && !PROFILE_SVELTO
if (implementorsByType.TryGetValue(componentType, out var implementorData))
{
implementorData.numberOfImplementations++;
implementorsByType[componentType] = implementorData;
}
else
{
implementorsByType[componentType] = new ECSTuple <object, int>(implementor, 1);
}
#else
implementorsByType[componentType] = implementor;
#endif
}
}
}
//efficient way to collect the fields of every EntityComponentType
var setters = FasterList <KeyValuePair <Type, FastInvokeActionCast <T> > > .NoVirt.ToArrayFast(
entityComponentBlazingFastReflection, out var count);
for (var i = 0; i < count; i++)
{
var fieldSetter = setters[i];
var fieldType = fieldSetter.Key;
#if DEBUG && !PROFILE_SVELTO
ECSTuple <object, int> implementor;
#else
object implementor;
#endif
if (implementorsByType.TryGetValue(fieldType, out implementor) == false)
{
var e = new ECSException(NOT_FOUND_EXCEPTION + " Component Type: " + fieldType.Name +
" - EntityComponent: " + componentBuilder.GetEntityComponentType().Name);
throw e;
}
#if DEBUG && !PROFILE_SVELTO
if (implementor.numberOfImplementations > 1)
{
throw new ECSException(DUPLICATE_IMPLEMENTOR_ERROR.FastConcat(
"Component Type: ", fieldType.Name, " implementor: ", implementor.instance.ToString()) +
" - EntityComponent: " + componentBuilder.GetEntityComponentType().Name);
}
#endif
#if DEBUG && !PROFILE_SVELTO
fieldSetter.Value(ref entityComponent, implementor.instance);
#else
fieldSetter.Value(ref entityComponent, implementor);
#endif
}
implementorsByType.Clear();
}