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game/client/object_motion_blur_effect.h

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+//============ Copyright (c) Valve Corporation, All rights reserved. ============
+//
+// Functionality to render object motion blur
+//
+//===============================================================================
+
+#ifndef OBJECT_MOTION_BLUR_EFFECT_H
+#define OBJECT_MOTION_BLUR_EFFECT_H
+
+#if defined( COMPILER_MSVC )
+#pragma once
+#endif
+
+#include "utlvector.h"
+
+//-----------------------------------------------------------------------------
+// Central registry for objects that want motion blur applied to them,
+// responsible for tracking and drawing models.
+//
+// Currently requires C_BaseAnimating objects, could be made to work with
+// other object types as long as they can 1) be scaled and 2) be rendered.
+//-----------------------------------------------------------------------------
+class CObjectMotionBlurManager
+{
+public:
+	CObjectMotionBlurManager() :
+	m_nFirstFreeSlot( ObjectMotionBlurDefinition_t::END_OF_FREE_LIST )
+	{
+	}
+
+	// Registers an entity with the object manager and returns an integer handle which must be unregistered before the object gdies
+	int RegisterObject( C_BaseAnimating *pEntity, float flVelocityScale );
+	
+	// Unregisters a previously registered entity
+	void UnregisterObject( int nObjectHandle );
+
+	void SetVelocityScale( int nObjectHandle, float flVelocityScale ) 
+	{ 
+		Assert( !m_ObjectMotionBlurDefinitions[nObjectHandle].IsUnused() );
+		m_ObjectMotionBlurDefinitions[nObjectHandle].m_flVelocityScale = flVelocityScale;
+	}
+	
+	// Iterates through all valid registered objects and calls ObjectMotionBlurDefinition_t::DrawModel() on them
+	void DrawObjects();
+
+	int GetDrawableObjectCount();
+
+private:
+	struct ObjectMotionBlurDefinition_t
+	{
+		bool ShouldDraw() const { return m_pEntity && m_pEntity->ShouldDraw() && m_flVelocityScale > 0; }
+		bool IsUnused() const { return m_nNextFreeSlot != ObjectMotionBlurDefinition_t::ENTRY_IN_USE; }
+		void DrawModel();
+
+		C_BaseAnimating *m_pEntity;
+		float m_flVelocityScale;
+
+		// Linked list of free slots
+		int m_nNextFreeSlot;
+
+		// Special values for ObjectMotionBlurDefinition_t::m_nNextFreeSlot
+		static const int END_OF_FREE_LIST = -1;
+		static const int ENTRY_IN_USE = -2;
+	};
+
+	CUtlVector< ObjectMotionBlurDefinition_t > m_ObjectMotionBlurDefinitions;
+	int m_nFirstFreeSlot;
+};
+
+extern CObjectMotionBlurManager g_ObjectMotionBlurManager;
+
+//-----------------------------------------------------------------------------
+// A scope-based auto-registration class for object motion blur
+//-----------------------------------------------------------------------------
+class CMotionBlurObject
+{
+public:
+	CMotionBlurObject( C_BaseAnimating *pEntity, float flVelocityScale = 0.2f )
+	{
+		m_nObjectHandle = g_ObjectMotionBlurManager.RegisterObject( pEntity, flVelocityScale );
+	}
+
+	~CMotionBlurObject()
+	{
+		g_ObjectMotionBlurManager.UnregisterObject( m_nObjectHandle );
+	}
+
+	void SetVelocityScale( float flVelocityScale )
+	{
+		g_ObjectMotionBlurManager.SetVelocityScale( m_nObjectHandle, flVelocityScale );
+	}
+
+private:
+	int m_nObjectHandle;
+
+	// Assignment & copy-construction disallowed
+	CMotionBlurObject( const CMotionBlurObject &other );
+	CMotionBlurObject& operator=( const CMotionBlurObject &other );
+};
+
+#endif // OBJECT_MOTION_BLUR_EFFECT_H