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

---
 sp/src/game/shared/sequence_Transitioner.cpp | 115 +++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 sp/src/game/shared/sequence_Transitioner.cpp

(limited to 'sp/src/game/shared/sequence_Transitioner.cpp')

diff --git a/sp/src/game/shared/sequence_Transitioner.cpp b/sp/src/game/shared/sequence_Transitioner.cpp
new file mode 100644
index 00000000..b2b1531b
--- /dev/null
+++ b/sp/src/game/shared/sequence_Transitioner.cpp
@@ -0,0 +1,115 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================//
+
+#include "cbase.h"
+#include "sequence_Transitioner.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+// -----------------------------------------------------------------------------
+// CSequenceTransitioner implementation.
+// -----------------------------------------------------------------------------
+
+void CSequenceTransitioner::CheckForSequenceChange( 
+	CStudioHdr *hdr,
+	int nCurSequence, 
+	bool bForceNewSequence,
+	bool bInterpolate )
+{
+	// sequence may be set before model is initialized
+	if ( hdr == NULL)
+		return;
+
+	// FIXME?: this should detect that what's been asked to be drawn isn't what was expected
+	// due to not only sequence change, by frame index, rate, or whatever.  When that happens, 
+	// it should insert the previous rules.
+
+	if (m_animationQueue.Count() == 0)
+	{
+		m_animationQueue.AddToTail();
+	}
+
+	CAnimationLayer *currentblend = &m_animationQueue[m_animationQueue.Count()-1];
+
+	if (currentblend->m_flLayerAnimtime && 
+		(currentblend->m_nSequence != nCurSequence || bForceNewSequence ))
+	{
+		mstudioseqdesc_t &seqdesc = hdr->pSeqdesc( nCurSequence );
+		// sequence changed
+		if ((seqdesc.flags & STUDIO_SNAP) || !bInterpolate )
+		{
+			// remove all entries
+			m_animationQueue.RemoveAll();
+		}
+		else
+		{
+			mstudioseqdesc_t &prevseqdesc = hdr->pSeqdesc( currentblend->m_nSequence );
+			currentblend->m_flLayerFadeOuttime = MIN( prevseqdesc.fadeouttime, seqdesc.fadeintime );
+			/*
+			// clip blends to time remaining
+			if ( !IsSequenceLooping(hdr, currentblend->m_nSequence) )
+			{
+				float length = Studio_Duration( hdr, currentblend->m_nSequence, flPoseParameter ) / currentblend->m_flPlaybackRate;
+				float timeLeft = (1.0 - currentblend->m_flCycle) * length;
+				if (timeLeft < currentblend->m_flLayerFadeOuttime)
+					currentblend->m_flLayerFadeOuttime = timeLeft;
+			}
+			*/
+		}
+		// push previously set sequence
+		m_animationQueue.AddToTail();
+		currentblend = &m_animationQueue[m_animationQueue.Count()-1];
+
+	}
+
+	currentblend->m_nSequence = -1;
+	currentblend->m_flLayerAnimtime = 0.0;
+	currentblend->m_flLayerFadeOuttime = 0.0;
+}
+
+
+void CSequenceTransitioner::UpdateCurrent( 
+	CStudioHdr *hdr,
+	int nCurSequence, 
+	float flCurCycle,
+	float flCurPlaybackRate,
+	float flCurTime )
+{
+	// sequence may be set before model is initialized
+	if ( hdr == NULL)
+		return;
+
+	if (m_animationQueue.Count() == 0)
+	{
+		m_animationQueue.AddToTail();
+	}
+
+	CAnimationLayer *currentblend = &m_animationQueue[m_animationQueue.Count()-1];
+
+	// keep track of current sequence
+	currentblend->m_nSequence = nCurSequence;
+	currentblend->m_flLayerAnimtime = flCurTime;
+	currentblend->m_flCycle = flCurCycle;
+	currentblend->m_flPlaybackRate = flCurPlaybackRate;
+
+	// calc blending weights for previous sequences
+	int i;
+	for (i = 0; i < m_animationQueue.Count() - 1;)
+	{
+ 		float s = m_animationQueue[i].GetFadeout( flCurTime );
+
+		if (s > 0)
+		{
+			m_animationQueue[i].m_flWeight = s;
+			i++;
+		}
+		else
+		{
+			m_animationQueue.Remove( i );
+		}
+	}
+}
-- 
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