feat: finish CKTargetCamera and CKTargetLight.

- finish all new added 4 classes, CKCamera, CKTargetCamera, CKLight, CKTargetLight. but no test.

LibCmo/CK2/ObjImpls/CKTargetCamera.cpp

@@ -1,6 +1,91 @@
 #include "CKTargetCamera.hpp"
 #include "../CKStateChunk.hpp"
+#include "../CKContext.hpp"
 
 namespace LibCmo::CK2::ObjImpls {
 
+	// MARK: THIS CODE IS BARELY FULL COPY OF CKTargetLight.
+	// Please sync them if you modify one of them!
+
+	CKTargetCamera::CKTargetCamera(CKContext* ctx, CK_ID ckid, CKSTRING name) :
+		CKCamera(ctx, ckid, name), m_Target3dEntity(0) {}
+
+	CKTargetCamera::~CKTargetCamera() {}
+
+	void CKTargetCamera::PreDelete() {
+		// Remove associated target
+		SetTarget(nullptr);
+	}
+
+	void CKTargetCamera::CheckPostDeletion() {
+		CKCamera::CheckPostDeletion();
+
+		// Remove target if is not existing.
+		CKObject* target = m_Context->GetObject(m_Target3dEntity);
+		if (target == nullptr) {
+			m_Target3dEntity = 0;
+		}
+	}
+
+	bool CKTargetCamera::Save(CKStateChunk* chunk, CKFileVisitor* file, CKDWORD flags) {
+		bool suc = CKCamera::Save(chunk, file, flags);
+		if (!suc) return false;
+		
+		// Save target
+		{
+			chunk->WriteIdentifier(CK_STATESAVEFLAGS_CAMERA::CK_STATESAVE_TCAMERATARGET);
+			CKObject* target = m_Context->GetObject(m_Target3dEntity);
+			chunk->WriteObjectPointer(target);
+		}
+
+		chunk->SetClassId(CK_CLASSID::CKCID_TARGETCAMERA);
+		return true;
+	}
+
+	bool CKTargetCamera::Load(CKStateChunk* chunk, CKFileVisitor* file) {
+		bool suc = CKCamera::Load(chunk, file);
+		if (!suc) return false;
+		
+		// Read target
+		if (chunk->SeekIdentifier(CK_STATESAVEFLAGS_CAMERA::CK_STATESAVE_TCAMERATARGET)) {
+			 chunk->ReadObjectID(m_Target3dEntity);
+		}
+
+		return true;
+	}
+
+	CK3dEntity* CKTargetCamera::GetTarget() const {
+		return static_cast<CK3dEntity*>(m_Context->GetObject(m_Target3dEntity));
+	}
+
+	void CKTargetCamera::SetTarget(CK3dEntity* target) {
+		// The target can not be self.
+		if (target == this) return;
+
+		// First remove current target
+		CK3dEntity* old_target = static_cast<CK3dEntity*>(m_Context->GetObject(m_Target3dEntity));
+		if (old_target != nullptr) {
+			CK_3DENTITY_FLAGS old_target_flags = old_target->GetEntityFlags();
+			YYCC::EnumHelper::Remove(old_target_flags, CK_3DENTITY_FLAGS::CK_3DENTITY_TARGETCAMERA);
+			YYCC::EnumHelper::Add(old_target_flags, CK_3DENTITY_FLAGS::CK_3DENTITY_FRAME);
+			old_target->SetEntityFlags(old_target_flags);
+		}
+
+		// Then add specified target
+		if (target != nullptr) {
+			CK_3DENTITY_FLAGS new_target_flags = target->GetEntityFlags();
+			YYCC::EnumHelper::Add(new_target_flags, CK_3DENTITY_FLAGS::CK_3DENTITY_TARGETCAMERA);
+			YYCC::EnumHelper::Remove(new_target_flags, CK_3DENTITY_FLAGS::CK_3DENTITY_FRAME);
+			target->SetEntityFlags(new_target_flags);
+		}
+
+		// Get CK_ID of new target
+		CK_ID target_id = 0;
+		if (target != nullptr)
+			target_id = target->GetID();
+
+		// Assign target id.
+		m_Target3dEntity = target_id;
+	}
+
 }