WTF?

include/Engine/Core/ComponentInfo.h

@@ -2,6 +2,7 @@
 #define ComponentInfo_h__
 
 #include "../Common.h"
+#include "Entity.h"
 #include <boost/shared_array.hpp>
 
 struct ComponentInfo
@@ -21,6 +22,7 @@ struct ComponentInfo
     {
         std::string Name;
         std::string Type;
+        unsigned char Index;
         unsigned int Offset;
         unsigned int Stride;
     };
@@ -32,6 +34,16 @@ struct ComponentInfo
     unsigned int Stride = 0;
     boost::shared_array<char> Defaults = nullptr;
 	std::shared_ptr<Meta_t> Meta = nullptr;
+
+    std::size_t GetHeaderSize() const
+    {
+        std::size_t size = 0;
+
+        // A component block starts with an entity ID
+        size += sizeof(EntityID);
+
+        return size;
+    }
 };
 
 template<>

include/Engine/Core/ComponentPool.h

@@ -5,16 +5,15 @@
 #include "MemoryPool.h"
 #include "ComponentInfo.h"
 #include "ComponentWrapper.h"
+#include "DirtySet.h"
 
+
+class ComponentPool;
 class ComponentPoolForwardIterator
 	: public std::iterator<std::forward_iterator_tag, ComponentWrapper>
 {
 public:
-    ComponentPoolForwardIterator(const ComponentInfo& componentInfo, const MemoryPool<char>::iterator begin, const MemoryPool<char>::iterator end) 
-        : m_ComponentInfo(componentInfo)
-        , m_MemoryPoolIterator(begin)
-        , m_MemoryPoolEnd(end)
-    { }
+    ComponentPoolForwardIterator(ComponentPool* pool);
 
 	ComponentPoolForwardIterator(const ComponentPoolForwardIterator& other) = default;
 	ComponentPoolForwardIterator(ComponentPoolForwardIterator&& other) = default;
@@ -27,6 +26,7 @@ public:
 	ComponentWrapper operator*() const;
 
 private:
+    ComponentPool* m_ComponentPool;
     const ComponentInfo& m_ComponentInfo;
 	MemoryPool<char>::iterator m_MemoryPoolIterator;
 	const MemoryPool<char>::iterator m_MemoryPoolEnd;
@@ -34,6 +34,7 @@ private:
 
 class ComponentPool
 {
+    friend class ComponentPoolForwardIterator;
 public:
 	typedef ComponentPoolForwardIterator iterator;
 	typedef ptrdiff_t difference_type;
@@ -41,10 +42,11 @@ public:
     typedef ComponentWrapper value_type;
 	typedef ComponentWrapper* pointer;
 	typedef ComponentWrapper& reference;
+    typedef std::unordered_map<EntityID, std::set<decltype(ComponentInfo::Field_t::Index)>> DirtySet_t;
 
     ComponentPool(const ::ComponentInfo& ci) 
         : m_ComponentInfo(ci)
-        , m_Pool(ci.Meta->Allocation, sizeof(EntityID) + ci.Stride)
+        , m_Pool(ci.Meta->Allocation, ci.GetHeaderSize() + ci.Stride)
     { }
     ~ComponentPool();
 	ComponentPool(const ComponentPool& other);
@@ -61,8 +63,8 @@ public:
     // Delete a component and free its memory
     void Delete(ComponentWrapper& wrapper);
 
-	iterator begin() const;
-	iterator end() const;
+    iterator begin();
+	iterator end();
     size_t size() const;
 
 	//Dumps information about what the pool memory looks like right now 
@@ -80,6 +82,7 @@ private:
     ::ComponentInfo m_ComponentInfo;
     MemoryPool<char> m_Pool;
     std::unordered_map<EntityID, char*> m_EntityToComponent;
+    DirtySet m_DirtySet;
 };
 
 #endif

include/Engine/Core/ComponentWrapper.h

@@ -6,44 +6,54 @@
 #include "../Common.h"
 #include "Entity.h"
 #include "ComponentInfo.h"
+#include "DirtySet.h"
 #include "Util/Any.h"
 
-template <typename T, typename Enable = void>
-struct ComponentField { };
-
-template <typename T>
-struct ComponentField<T, typename std::enable_if<std::is_trivially_copyable<T>::value>::type>
-{
-    static T& Get(const ComponentInfo::Field_t& info, char* data) { return *reinterpret_cast<T*>(data); }
-    static void Set(const ComponentInfo::Field_t& info, char* data, const T& value) { Get(data) = value; }
-};
-
-template <>
-struct ComponentField<std::string, void>
-{
-    static std::string& Get(const ComponentInfo::Field_t& info, char* data) { return **reinterpret_cast<std::string**>(data); }
-    static void Set(const ComponentInfo::Field_t& info, char* data, const std::string& value) { Get(info, data) = value; }
-};
-
 struct ComponentWrapper
 {
-    ComponentWrapper(const ComponentInfo& componentInfo, char* data)
+    ComponentWrapper(const ComponentInfo& componentInfo, char* data, ::DirtyBitField* dirtyBitField)
         : Info(componentInfo)
         , EntityID(*reinterpret_cast<::EntityID*>(data))
-        , Data(data + sizeof(::EntityID))
+        , Data(data + componentInfo.GetHeaderSize())
+        , DirtyBitField(dirtyBitField)
     { }
 
     const ComponentInfo& Info;
     const ::EntityID EntityID;
     char* Data;
+    ::DirtyBitField* DirtyBitField = nullptr;
 
     ComponentInfo::EnumType Enum(const char* fieldName, const char* enumKey)
     {
         return Info.Meta->FieldEnumDefinitions.at(fieldName).at(enumKey);
     }
 
+    bool Dirty(DirtySetType type, const std::string& fieldName)
+    {
+        if (DirtyBitField == nullptr) {
+            return true;
+        } else {
+            auto& field = Info.Fields.at(fieldName);
+            return DirtyBitField->operator[](type).count(field.Index) == 1;
+        }
+    }
+
+    void SetDirty(DirtySetType type, const std::string& fieldName, bool dirty = true)
+    {
+        if (DirtyBitField == nullptr) {
+            return;
+        }
+
+        auto& field = Info.Fields.at(fieldName);
+        if (dirty) {
+            DirtyBitField->operator[](type).insert(field.Index);
+        } else {
+            DirtyBitField->operator[](type).erase(field.Index);
+        }
+    }
+
     template <typename T>
-    T& Field(std::string name)
+    T& Field(const std::string& name)
     {
         const ComponentInfo::Field_t& field = Info.Fields.at(name);
         if (sizeof(T) > field.Stride) {
@@ -55,13 +65,13 @@ struct ComponentWrapper
     }
 
     template <typename T>
-    void SetField(std::string name, const T value) { Field<T>(name) = value; }
+    void SetField(const std::string& name, const T value) { Field<T>(name) = value; }
     //template <typename T>
     //void SetField(std::string name, T& value) { Field<T>(name) = value; }
 
     // Specialization for string literals
     template <std::size_t N>
-    void SetField(std::string name, const char(&value)[N]) { Field<std::string>(name) = std::string(value); }
+    void SetField(const std::string& name, const char(&value)[N]) { Field<std::string>(name) = std::string(value); }
 
     void Copy(ComponentWrapper& destination)
     {
@@ -96,39 +106,41 @@ struct ComponentWrapper
     {
         friend struct ComponentWrapper;
     private:
-        SubscriptProxy(ComponentWrapper* component, std::string propertyName)
+        SubscriptProxy(ComponentWrapper* component, std::string fieldName)
             : m_Component(component)
-            , m_PropertyName(propertyName)
+            , m_FieldName(fieldName)
         { }
 
         ComponentWrapper* m_Component;
-        std::string m_PropertyName;
+        std::string m_FieldName;
 
     public:
         // Return the integer value of an enum type key for this field
-        ComponentInfo::EnumType Enum(const char* enumKey) { return m_Component->Enum(m_PropertyName.c_str(), enumKey); }
+        ComponentInfo::EnumType Enum(const char* enumKey) { return m_Component->Enum(m_FieldName.c_str(), enumKey); }
+        bool Dirty(DirtySetType type) { return m_Component->Dirty(type, m_FieldName); }
+        void SetDirty(DirtySetType type, bool dirty = true) { m_Component->SetDirty(type, m_FieldName, dirty); }
 
         template <typename T>
-        operator T&() { return m_Component->Field<T>(m_PropertyName); }
+        operator T&() { return m_Component->Field<T>(m_FieldName); }
 
         template <typename T>
-        void operator=(const T val) { m_Component->SetField<T>(m_PropertyName, val); }
+        void operator=(const T val) { m_Component->SetField<T>(m_FieldName, val); }
         // TODO: Pass by reference and rvalue (universal reference?)
         //template <typename T>
         //void operator=(T& val) { m_Component->SetField<T>(m_PropertyName, val); }
 
         // Specialization for string literals
         template <std::size_t N>
-        void operator=(const char(&val)[N]) { m_Component->SetField<N>(m_PropertyName, val); }
+        void operator=(const char(&val)[N]) { m_Component->SetField<N>(m_FieldName, val); }
     };
-    SubscriptProxy operator[](std::string propertyName) { return SubscriptProxy(this, propertyName); }
+    SubscriptProxy operator[](const std::string& propertyName) { return SubscriptProxy(this, propertyName); }
 };
 
 // A component wrapper that "owns" its data through a shared pointer
 struct SharedComponentWrapper : ComponentWrapper
 {
     SharedComponentWrapper(const ComponentInfo& componentInfo, boost::shared_array<char> data)
-        : ComponentWrapper(componentInfo, data.get())
+        : ComponentWrapper(componentInfo, data.get(), nullptr)
         , m_DataReference(data)
     { }
 

include/Engine/Core/DirtySet.h

@@ -0,0 +1,16 @@
+#ifndef DirtySet_h__
+#define DirtySet_h__
+
+#include <set>
+#include "ComponentInfo.h"
+
+enum class DirtySetType
+{
+    Transform,
+    Network
+};
+
+typedef std::unordered_map<DirtySetType, std::set<decltype(ComponentInfo::Field_t::Index)>> DirtyBitField;
+typedef std::unordered_map<EntityID, DirtyBitField> DirtySet;
+
+#endif

include/Engine/Core/SystemPipeline.h

@@ -81,7 +81,7 @@ public:
             for (auto& pair : group.PureSystems) {
                 const std::string& componentName = pair.first;
                 auto& systems = pair.second;
-                const ComponentPool* pool = m_World->GetComponents(componentName);
+                ComponentPool* pool = m_World->GetComponents(componentName);
                 if (pool == nullptr) {
                     continue;
                 }

include/Engine/Core/World.h

@@ -35,7 +35,7 @@ public:
     // Delete a component off an entity
     void DeleteComponent(EntityID entity, const std::string& componentType);
     // Get all components of the specified type
-    const ComponentPool* GetComponents(const std::string& componentType);
+    ComponentPool* GetComponents(const std::string& componentType);
     // Get entity parent
     EntityID GetParent(EntityID entity);
     // Change the parent of an entity

src/Engine/Core/ComponentPool.cpp

@@ -1,9 +1,17 @@
 #include "Core/ComponentPool.h"
 
+ComponentPoolForwardIterator::ComponentPoolForwardIterator(ComponentPool* pool) 
+    : m_ComponentPool(pool)
+    , m_ComponentInfo(pool->m_ComponentInfo)
+    , m_MemoryPoolIterator(pool->m_Pool.begin())
+    , m_MemoryPoolEnd(pool->m_Pool.end())
+{ }
+
 ComponentWrapper ComponentPoolForwardIterator::operator*() const
 {
     char* data = &(*m_MemoryPoolIterator);
-    ComponentWrapper wrapper(m_ComponentInfo, data);
+    EntityID entity = *reinterpret_cast<EntityID*>(data);
+    ComponentWrapper wrapper(m_ComponentInfo, data, &m_ComponentPool->m_DirtySet[entity]);
     return wrapper;
 }
 
@@ -71,7 +79,7 @@ ComponentWrapper ComponentPool::Allocate(EntityID entity)
     memcpy(data, &entity, sizeof(EntityID));
 
     m_EntityToComponent[entity] = data;
-    ComponentWrapper component(m_ComponentInfo, data);
+    ComponentWrapper component(m_ComponentInfo, data, &m_DirtySet[entity]);
 
     // Copy defaults
     memcpy(component.Data, m_ComponentInfo.Defaults.get(), m_ComponentInfo.Stride);
@@ -82,7 +90,9 @@ ComponentWrapper ComponentPool::Allocate(EntityID entity)
 
 ComponentWrapper ComponentPool::GetByEntity(EntityID ent)
 {
-     return ComponentWrapper(m_ComponentInfo, m_EntityToComponent.at(ent));
+    auto data = m_EntityToComponent.at(ent);
+    auto bitField = &m_DirtySet[ent];
+    return ComponentWrapper(m_ComponentInfo, data, bitField);
 }
 
 bool ComponentPool::KnowsEntity(EntityID ent)
@@ -95,16 +105,17 @@ void ComponentPool::Delete(ComponentWrapper& wrapper)
     ComponentWrapper::Destroy(wrapper.Info, wrapper.Data);
     m_EntityToComponent.erase(wrapper.EntityID);
     m_Pool.Free(wrapper.Data - sizeof(EntityID));
+    m_DirtySet.erase(wrapper.EntityID);
 }
 
-ComponentPool::iterator ComponentPool::begin() const
+ComponentPool::iterator ComponentPool::begin()
 {
-    return iterator(m_ComponentInfo, m_Pool.begin(), m_Pool.end());
+    return iterator(this);
 }
 
-ComponentPool::iterator ComponentPool::end() const
+ComponentPool::iterator ComponentPool::end()
 {
-    return iterator(m_ComponentInfo, m_Pool.end(), m_Pool.end());
+    return iterator(this);
 }
 
 size_t ComponentPool::size() const

src/Engine/Core/EntityXMLFilePreprocessor.cpp

@@ -125,6 +125,7 @@ void EntityXMLFilePreprocessor::parseComponentInfo()
         auto modelGroup = modelGroupParticle->getModelGroupTerm();
 
         // <xs:element... 
+        unsigned char fieldIndex = 0;
         unsigned int fieldOffset = 0;
         auto particles = modelGroup->getParticles();
         for (unsigned int i = 0; i < particles->size(); ++i) {
@@ -182,12 +183,14 @@ void EntityXMLFilePreprocessor::parseComponentInfo()
             auto& field = compInfo.Fields[name];
             field.Name = name;
             field.Type = effectiveType;
+            field.Index = fieldIndex;
             field.Offset = fieldOffset;
             field.Stride = stride;
             compInfo.FieldsInOrder.push_back(name);
             if (field.Type == "string") {
                 compInfo.StringFields.push_back(name);
             }
+            fieldIndex += 1;
             fieldOffset += stride;
         }
 

src/Engine/Core/World.cpp

@@ -95,7 +95,7 @@ void World::DeleteComponent(EntityID entity, const std::string& componentType)
     }
 }
 
-const ComponentPool* World::GetComponents(const std::string& componentType)
+ComponentPool* World::GetComponents(const std::string& componentType)
 {
     auto it = m_ComponentPools.find(componentType);
     return (it != m_ComponentPools.end()) ? it->second : nullptr;

src/Game/Systems/PlayerMovementSystem.cpp

@@ -29,7 +29,7 @@ void PlayerMovementSystem::Update(double dt)
             return;
         }
         m_SprintEffectTimer = 0.f;
-        const ComponentPool* pool = m_World->GetComponents("SprintAbility");
+        auto pool = m_World->GetComponents("SprintAbility");
         if (pool == nullptr) {
             return;
         }

src/Game/Systems/SpawnerSystem.cpp

@@ -86,7 +86,7 @@ bool SpawnerSystem::spawnedEntityIsColliding(EntityWrapper spawnedEntity, Entity
     transformEntityToSpawnPoint(spawnedEntity, spawnPoint);
     //Check if the spawned entity collides with anything, and if so, continue to the next spawnpoint.
     EntityAABB spawnedBox = *Collision::EntityAbsoluteAABB(spawnedEntity);
-    const ComponentPool* otherSpawnedEntities = spawnPoint.World->GetComponents(dontCollideComponent);
+    auto otherSpawnedEntities = spawnPoint.World->GetComponents(dontCollideComponent);
     for (const auto& obj : *otherSpawnedEntities) {
         if (spawnedEntity.ID == obj.EntityID) {
             continue;