CWE-ou-minkata/Sources/Tools/MaxPlasmaLights/plRTObjLightDesc.h

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*==LICENSE==*/
///////////////////////////////////////////////////////////////////////////////
//                                                                           //
//  plRTObjLightDesc.h - Header for the various ObjLightDesc classes         //
//  Cyan, Inc.                                                               //
//                                                                           //
//// Version History //////////////////////////////////////////////////////////
//                                                                           //
//  8.2.2001 mcn - Created.                                                  //
//                                                                           //
///////////////////////////////////////////////////////////////////////////////

#ifndef _plRTObjLightDesc_h
#define _plRTObjLightDesc_h

class plRTLightBase;
class plMaxNode;

//// AttenRanges Class ////////////////////////////////////////////////////////

class AttenRanges 
{
    public:
        float aStart, aEnd; // Attenuation start and end and hot spot scaling for volume shading        
        //float aNearStart, aNearEnd;   // Near Attenuation start and end and hot spot scaling for volume shading       
        float decayRadius;
};

//// BaseObjLight Class ///////////////////////////////////////////////////////

class BaseObjLight : public ObjLightDesc 
{
    public:     
        Color intensCol;    // intens*color 
        Color shadColor;
        float contrast,kA,kB,diffSoft;
        int decayType;
        BOOL diffSoften;
        float decayRadius;
        plRTLightBase* gl;
        BaseObjLight(INode *n);
        void DeleteThis() {delete this;}
        int Update(TimeValue t, const RendContext& rc, RenderGlobalContext * rgc, BOOL shadows, BOOL shadowGeomChanged);
        void UpdateGlobalLightLevel(Color globLightLevel) { intensCol = ls.intens*ls.color*globLightLevel;}
        virtual Color AttenuateIllum(ShadeContext& sc,Point3 p,Color &colStep,Point3 &dp,int filt, float ldp, float &distAtten, AttenRanges &ranges) {return Color(0,0,0);}     
        virtual BOOL UseAtten()=0;
        virtual BOOL IsFacingLight(Point3 &dir) {return FALSE;}
        virtual int LightType()=0;

        inline float ContrastFunc(float nl) {
            if (diffSoft!=0.0f) {
                float p = nl*nl*(2.0f-nl);  // based on Hermite interpolant 
                nl = diffSoft*p + (1.0f-diffSoft)*nl;
                }
            return (contrast==0.0f)? nl: 
                nl/(kA*nl+kB);  //  the "Bias" function described in Graphics Gems IV, pp. 401ff
            }

};

//// OmniLight Class //////////////////////////////////////////////////////////

class OmniLight : public BaseObjLight 
{       
    Matrix3 tmCamToLight[6]; 
    BOOL shadow, doShadows, shadowRay;
    Texmap *projMap;
    BOOL needMultiple;
    BOOL genCanDoOmni;
    float zfac, xscale, yscale, fov, sz2,size,sizeClip,sampSize,sampSize2;
    public:     
        OmniLight(INode *inode, BOOL forceShadowBuf );
        ~OmniLight();
        int Update(TimeValue t, const RendContext& rc, RenderGlobalContext *rgc, BOOL shadows, BOOL shadowGeomChanged);
        int UpdateViewDepParams(const Matrix3& worldToCam);
        BOOL UseAtten() {return TRUE;}
        int LightType() { return plRTLightBase::RT_OMNI; }
};

//// SpotLight Class //////////////////////////////////////////////////////////

class SpotLight: public BaseObjLight 
{   
    Point3 lightDir;  // light direction in render space
    BOOL projector; //, shadowRay, overshoot;
    float hot_cos, fall_cos, fall_tan, fall_sin;
    float hotpct, ihotpct;  
    float zfac, xscale,yscale, fov, sz2, curve;
    float out_range,in_range, range_span;
    Point2 rectv0, rectv1;
    Texmap* projMap;
    public:
        SpotLight(INode *inode, BOOL forceShadowBuf );
        ~SpotLight() {} //  FreeShadGens();     }
        int Update(TimeValue t, const RendContext& rc, RenderGlobalContext *rgc, BOOL shadows, BOOL shadowGeomChanged);
        int UpdateViewDepParams(const Matrix3& worldToCam);
        BOOL UseAtten() {return ls.useAtten;}
        BOOL IsFacingLight(Point3 &dir);
        int LightType() { return FSPOT_LIGHT; }
};

//// DirLight Class ///////////////////////////////////////////////////////////

class DirLight : public BaseObjLight 
{
    Point3 lightDir;  // light direction in render space    
    //BOOL projector;//,overshoot;
    float hotsz, fallsz, fallsq;    
    float xscale, yscale, sz2, curve;
    float out_range,in_range, range_span;
    float hotpct,ihotpct;
    float aspect;
    float sw2, sh2;
    Texmap* projMap;
    public:
        DirLight(INode *inode, BOOL forceShadowBuf );
        ~DirLight() {   /*  FreeShadGens();*/}
        int Update(TimeValue t, const RendContext& rc, RenderGlobalContext *rgc, BOOL shadows, BOOL shadowGeomChanged);
        int UpdateViewDepParams(const Matrix3& worldToCam);
        BOOL UseAtten() {return FALSE;}
        int LightType() { return plRTLightBase::RT_FREE_DIR; }
};


#endif  // _plRTObjLightDesc_h