CWE-ou-minkata/Sources/Plasma/PubUtilLib/plGLight/plShadowSlave.h

/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

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Additional permissions under GNU GPL version 3 section 7

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*==LICENSE==*/

#ifndef plShadowSlave_inc
#define plShadowSlave_inc

#include "hsMatrix44.h"
#include "hsBounds.h"
#include "plViewTransform.h"
#include "hsGeometry3.h"

class plShadowCaster;
class plVolumeIsect;
class plPipeline;

class plShadowSlave
{
public:

    uint32_t              fIndex;

    hsMatrix44          fWorldToLight;
    hsMatrix44          fLightToWorld;

    hsPoint3            fLightPos;
    hsVector3           fLightDir;

    hsMatrix44          fWorldToTexture;
    hsMatrix44          fCastLUT;
    hsMatrix44          fRcvLUT;

    plViewTransform     fView;

    float            fPower;
    float            fBlurScale;

    hsBounds3Ext        fCasterWorldBounds;
    hsBounds3Ext        fWorldBounds;

    plVolumeIsect*      fIsect;

    uint32_t              fWidth;
    uint32_t              fHeight;

    float            fAttenDist;

    float            fPriority;

    uint32_t              fFlags;

    enum SlaveFlag
    {
        kObeysLightGroups       = 0x1,
        kIncludesChars          = 0x2,
        kSelfShadow             = 0x4,
        kCastInCameraSpace      = 0x8,
        kReverseZ               = 0x10,
        kTwoSided               = 0x20,
        kReverseCull            = 0x40,
        kPositional             = 0x80
    };

    virtual ~plShadowSlave() { }

    void SetFlag(SlaveFlag f, bool on) { if(on) fFlags |= f; else fFlags &= ~f; }
    bool HasFlag(SlaveFlag f) const { return 0 != (fFlags & f); }

    bool ObeysLightGroups() const { return HasFlag(kObeysLightGroups); }
    bool IncludesChars() const { return HasFlag(kIncludesChars); }
    bool SelfShadow() const { return HasFlag(kSelfShadow); }
    bool CastInCameraSpace() const { return HasFlag(kCastInCameraSpace); }
    bool ReverseZ() const { return HasFlag(kReverseZ); }
    bool TwoSided() const { return HasFlag(kTwoSided); }
    bool ReverseCull() const { return HasFlag(kReverseCull); }
    bool Positional() const { return HasFlag(kPositional); }

    virtual void Init() { fFlags = 0; }

    const plShadowCaster*       fCaster;

    // Internal to pipeline, no touch!!!
    int                         fLightIndex;
    int                         fLightRefIdx;
    int                         fSelfShadowOn;
    void*                       fPipeData; 

    bool                ISetupOrthoViewTransform();
    bool                ISetupPerspViewTransform();

    virtual bool        SetupViewTransform(plPipeline* pipe) = 0;
};

class plDirectShadowSlave : public plShadowSlave
{
    virtual bool        SetupViewTransform(plPipeline* pipe) { return ISetupOrthoViewTransform(); }
};

class plPointShadowSlave : public plShadowSlave
{
    virtual bool        SetupViewTransform(plPipeline* pipe) { return ISetupPerspViewTransform(); }
};

#endif // plShadowSlave_inc