101 lines
3.2 KiB
C++
101 lines
3.2 KiB
C++
//============ 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
|