CWE-ou-minkata/Sources/Plasma/FeatureLib/pfSurface/plDistOpacityMod.h

/*==LICENSE==*

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*==LICENSE==*/

#ifndef plDistOpacityMod_inc
#define plDistOpacityMod_inc

#include "hsGeometry3.h"
#include "pnModifier/plSingleModifier.h"
#include "hsTemplates.h"

class plPipeline;
class plRenderMsg;
class plFadeOpacityLay;


class plDistOpacityMod : public plSingleModifier
{
public:

    enum {
        kTrackAvatar,
        kTrackCamera
    };
protected:

    enum {
        kRefFadeLay
    };

    // Volatile flag, whether we're setup yet or not.
    uint8_t           fSetup;

    enum {
        kNearTrans,
        kNearOpaq,
        kFarOpaq,
        kFarTrans,

        kNumDists
    };
    float           fDists[kNumDists];

    hsPoint3        fRefPos;

    hsTArray<plFadeOpacityLay*> fFadeLays;

    // We only act in response to messages.
    virtual bool IEval(double secs, float del, uint32_t dirty) { return false; }

    float ICalcOpacity(const hsPoint3& targPos, const hsPoint3& refPos) const;
    void ISetOpacity();

    void ISetup();

    void ICheckDists()
    {
        hsAssert(fDists[kNearTrans] <= fDists[kNearOpaq], "Bad transition values");
        hsAssert(fDists[kNearOpaq] <= fDists[kFarOpaq], "Bad transition values");
        hsAssert(fDists[kFarOpaq] <= fDists[kFarTrans], "Bad transition values");
    }

public:
    plDistOpacityMod();
    virtual ~plDistOpacityMod();

    CLASSNAME_REGISTER( plDistOpacityMod );
    GETINTERFACE_ANY( plDistOpacityMod, plSingleModifier );

    virtual void            SetKey(plKey k);

    virtual bool            MsgReceive(plMessage* msg);

    virtual void            Read(hsStream* s, hsResMgr* mgr);
    virtual void            Write(hsStream* s, hsResMgr* mgr);

    virtual void            SetTarget(plSceneObject* so);

    // Rules are:
    // NearTrans <= NearOpaq <= FarOpaque <= FarTrans
    void SetFarDist(float opaque, float transparent);
    void SetNearDist(float transparent, float opaque);

    float GetFarTransparent() const { return fDists[kFarTrans]; }
    float GetNearTransparent() const { return fDists[kNearTrans]; }
    float GetFarOpaque() const { return fDists[kFarOpaq]; }
    float GetNearOpaque() const { return fDists[kNearOpaq]; }
};

#endif // plDistOpacityMod_inc