Engine: fully reverse engineer CEntityInfo & CEntityReadInfo

src/engine/CMakeLists.txt

@@ -138,6 +138,7 @@ add_sources( SOURCE_GROUP "Shared"
     "shared/shared_rcon.h"
     "shared/datablock.cpp"
     "shared/datablock.h"
+    "shared/ents_shared.h"
 )
 
 if( NOT ${PROJECT_NAME} STREQUAL "engine_ds" )

src/engine/shared/ents_shared.h

@@ -0,0 +1,66 @@
+//===== Copyright © 1996-2005, Valve Corporation, All rights reserved. ======//
+//
+// Purpose: 
+//
+//===========================================================================//
+
+#ifndef ENTS_SHARED_H
+#define ENTS_SHARED_H
+
+//-----------------------------------------------------------------------------
+// Forward declarations
+//-----------------------------------------------------------------------------
+class CClientFrame;
+class bf_read;
+
+// Used to classify entity update types in DeltaPacketEntities.
+enum EntityUpdateType_e
+{
+	EnterPVS = 0,	// Entity came back into pvs, create new entity if one doesn't exist
+
+	LeavePVS,		// Entity left pvs
+
+	DeltaEnt,		// There is a delta for this entity.
+	PreserveEnt,	// Entity stays alive but no delta ( could be LOD, or just unchanged )
+
+	Finished,		// finished parsing entities successfully
+	Failed,			// parsing error occured while reading entities
+};
+
+// Base entity info class.
+struct CEntityInfo
+{
+	virtual	~CEntityInfo() {};
+
+	bool m_bAsDelta;
+
+	CClientFrame* m_pFrom;
+	CClientFrame* m_pTo;
+
+	EntityUpdateType_e m_UpdateType;
+
+	int m_nOldEntity; // current entity index in m_pFrom
+	int m_nNewEntity; // current entity index in m_pTo
+
+	int m_nHeaderBase;
+	int m_nHeaderCount;
+};
+
+// Flags for delta encoding header
+enum EntityUpdateFlags_e
+{
+	FHDR_ZERO = 0x0,
+	FHDR_LEAVEPVS = 0x1,
+	FHDR_DELETE = 0x2,
+	FHDR_ENTERPVS = 0x4,
+};
+
+// Passed around the read functions.
+class CEntityReadInfo : public CEntityInfo
+{
+	bf_read* m_pBuf;
+	EntityUpdateFlags_e m_UpdateFlags; // from the subheader
+	bool m_bIsEntity;
+};
+
+#endif // ENTS_SHARED_H