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

/*==LICENSE==*

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

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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			fSetup;

	enum {
		kNearTrans,
		kNearOpaq,
		kFarOpaq,
		kFarTrans,

		kNumDists
	};
	hsScalar		fDists[kNumDists];

	hsPoint3		fRefPos;

	hsTArray<plFadeOpacityLay*> fFadeLays;

	// We only act in response to messages.
	virtual hsBool IEval(double secs, hsScalar del, UInt32 dirty) { return false; }

	hsScalar 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 hsBool			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(hsScalar opaque, hsScalar transparent);
	void SetNearDist(hsScalar transparent, hsScalar opaque);

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

#endif // plDistOpacityMod_inc