From 39ed87570bdb2f86969d4be821c94b722dc71179 Mon Sep 17 00:00:00 2001
From: Joe Ludwig <joe@valvesoftware.com>
Date: Wed, 26 Jun 2013 15:22:04 -0700
Subject: First version of the SOurce SDK 2013

---
 mp/src/game/shared/predicted_viewmodel.cpp | 71 ++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 mp/src/game/shared/predicted_viewmodel.cpp

(limited to 'mp/src/game/shared/predicted_viewmodel.cpp')

diff --git a/mp/src/game/shared/predicted_viewmodel.cpp b/mp/src/game/shared/predicted_viewmodel.cpp
new file mode 100644
index 00000000..5af87f46
--- /dev/null
+++ b/mp/src/game/shared/predicted_viewmodel.cpp
@@ -0,0 +1,71 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose:
+//
+//=============================================================================//
+#include "cbase.h"
+#include "predicted_viewmodel.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+LINK_ENTITY_TO_CLASS( predicted_viewmodel, CPredictedViewModel );
+
+IMPLEMENT_NETWORKCLASS_ALIASED( PredictedViewModel, DT_PredictedViewModel )
+
+BEGIN_NETWORK_TABLE( CPredictedViewModel, DT_PredictedViewModel )
+END_NETWORK_TABLE()
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+#ifdef CLIENT_DLL
+CPredictedViewModel::CPredictedViewModel() : m_LagAnglesHistory("CPredictedViewModel::m_LagAnglesHistory")
+{
+	m_vLagAngles.Init();
+	m_LagAnglesHistory.Setup( &m_vLagAngles, 0 );
+}
+#else
+CPredictedViewModel::CPredictedViewModel()
+{
+}
+#endif
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+CPredictedViewModel::~CPredictedViewModel()
+{
+}
+
+#ifdef CLIENT_DLL
+ConVar cl_wpn_sway_interp( "cl_wpn_sway_interp", "0.1", FCVAR_CLIENTDLL );
+ConVar cl_wpn_sway_scale( "cl_wpn_sway_scale", "1.0", FCVAR_CLIENTDLL|FCVAR_CHEAT );
+#endif
+
+void CPredictedViewModel::CalcViewModelLag( Vector& origin, QAngle& angles, QAngle& original_angles )
+{
+	#ifdef CLIENT_DLL
+		// Calculate our drift
+		Vector	forward, right, up;
+		AngleVectors( angles, &forward, &right, &up );
+		
+		// Add an entry to the history.
+		m_vLagAngles = angles;
+		m_LagAnglesHistory.NoteChanged( gpGlobals->curtime, cl_wpn_sway_interp.GetFloat(), false );
+		
+		// Interpolate back 100ms.
+		m_LagAnglesHistory.Interpolate( gpGlobals->curtime, cl_wpn_sway_interp.GetFloat() );
+		
+		// Now take the 100ms angle difference and figure out how far the forward vector moved in local space.
+		Vector vLaggedForward;
+		QAngle angleDiff = m_vLagAngles - angles;
+		AngleVectors( -angleDiff, &vLaggedForward, 0, 0 );
+		Vector vForwardDiff = Vector(1,0,0) - vLaggedForward;
+
+		// Now offset the origin using that.
+		vForwardDiff *= cl_wpn_sway_scale.GetFloat();
+		origin += forward*vForwardDiff.x + right*-vForwardDiff.y + up*vForwardDiff.z;
+	#endif
+}
\ No newline at end of file
-- 
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