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engine/cl_pred.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $Workfile:     $
+// $Date:         $
+//
+//-----------------------------------------------------------------------------
+// $Log: $
+//
+// $NoKeywords: $
+//=============================================================================//
+#include "client_pch.h"
+#include "demo.h"
+#include "host.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : world_start_state - 
+//			validframe - 
+//			start_command - 
+//			stop_command - 
+//-----------------------------------------------------------------------------
+void CL_Predict( int world_start_state, bool validframe, int start_command, int stop_command )
+{
+	// Allow client .dll to do prediction.
+	g_pClientSidePrediction->Update( 
+		world_start_state, 
+		validframe, 
+		start_command, 
+		stop_command );
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Determine if we received a new message, which means we need to
+//  redo prediction
+//-----------------------------------------------------------------------------
+void CL_RunPrediction( PREDICTION_REASON reason )
+{
+	tmZone( TELEMETRY_LEVEL0, TMZF_NONE, "%s", __FUNCTION__ );
+
+	if ( !cl.IsActive() )
+		return;
+
+	if ( cl.m_nDeltaTick < 0 ) 
+	{
+		// no valid snapshot received yet
+		return;
+	}
+
+	// Don't do prediction if skipping ahead during demo playback
+	if ( demoplayer->IsSkipping() )
+	{
+		return;
+	}
+
+	//Msg( "%i pred reason %s\n", host_framecount, reason == PREDICTION_SIMULATION_RESULTS_ARRIVING_ON_SEND_FRAME ?
+	//	"same frame" : "normal" );
+
+	bool valid = cl.m_nDeltaTick > 0; // cl.GetReceiveList( cl.delta_tick ) != NULL;
+
+	//Msg( "%i/%i CL_RunPrediction:  last ack %i most recent %i\n", 
+	//	host_framecount, cl.tickcount,
+	//	cl.last_command_ack, 
+	//	cl.netchan->m_nOutSequenceNr - 1 );
+
+	CL_Predict( cl.m_nDeltaTick, 
+		valid,  
+		cl.last_command_ack, 
+		cl.lastoutgoingcommand + cl.chokedcommands );
+}