//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
// $Workfile:     $
// $Date:         $
//
//-----------------------------------------------------------------------------
// $Log: $
//
// $NoKeywords: $
//=============================================================================//
#if !defined(IVIEWEFFECTS_H)
#define IVIEWEFFECTS_H
#ifdef _WIN32
#pragma once
#endif

class Vector;
class QAngle;
class bf_read;

//-----------------------------------------------------------------------------
// Purpose: Apply effects to view origin/angles, etc.  Screen fade and shake
//-----------------------------------------------------------------------------
abstract_class IViewEffects {
   public:
    // Initialize subsystem
    virtual void Init(void) = 0;
    // Initialize after each level change
    virtual void LevelInit(void) = 0;
    // Called each frame to determine the current view fade parameters ( color
    // and alpha )
    virtual void GetFadeParams(unsigned char *r, unsigned char *g,
                               unsigned char *b, unsigned char *a,
                               bool *blend) = 0;
    // Apply directscreen shake
    virtual void Shake(ScreenShake_t & data) = 0;
    // Apply direct screen fade
    virtual void Fade(ScreenFade_t & data) = 0;
    // Clear all permanent fades in our fade list
    virtual void ClearPermanentFades(void) = 0;
    // Clear all fades in our fade list
    virtual void ClearAllFades(void) = 0;
    // Compute screen shake values for this frame
    virtual void CalcShake(void) = 0;
    // Apply those values to the passed in vector(s).
    virtual void ApplyShake(Vector & origin, QAngle & angles, float factor) = 0;
    // Save / Restore
    virtual void Save(ISave * pSave) = 0;
    virtual void Restore(IRestore * pRestore, bool) = 0;
};

extern IViewEffects *vieweffects;

#endif  // IVIEWEFFECTS_H