GU/GU_BrushNib.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *      Jeff Lait
 *      Side Effects Software Inc
 *      477 Richmond Street West
 *      Toronto, Ontario
 *      Canada   M5V 3E7
 *      416-504-9876
 *
 * NAME:        GU_BrushNib.h ( GU Library, C++)
 *
 * COMMENTS:
 */

#ifndef __GU_BrushNib__
#define __GU_BrushNib__

#include "GU_API.h"
#include <UT/UT_Vector3.h>
#include <UT/UT_Matrix3.h>

class TS_MetaKernel;
class TIL_TextureMap;

// This must match the ordered list in SOPs.
enum GU_BrushBitmapChan {
    GU_BRUSHBMPCHAN_ALPHA,
    GU_BRUSHBMPCHAN_LUM,
    GU_BRUSHBMPCHAN_RED,
    GU_BRUSHBMPCHAN_GREEN,
    GU_BRUSHBMPCHAN_BLUE
};

//
// This class describes how to do a single dab with the brush.  For each
// point it describes what the alpha should be:
//
class GU_API GU_BrushNib
{
public:
    GU_BrushNib();
    virtual ~GU_BrushNib();

    // Determine if pos is within the nibs depth.
    // It will initialize depth to the depth to the point in the nib.  If
    // depth clipping is off, depth will always be set to 0.0f.
    bool                         testDepth(const UT_Vector3 &pos, float &depth) 
                                        const;
    
    virtual float                getAlpha(const UT_Vector3 &pos);

    virtual float                getAlphaColor(const UT_Vector3 &pos, 
                                                UT_Vector3 &cd);

    int                          hasStamping() const { return myStampColor; }

    void                         setOpacity(float val) { myOpacity = val; }
    float                        getOpacity() const { return myOpacity; }

    void                         setDepth(bool usedepth, 
                                            float depth, float height)
                                 { myUseDepth = usedepth; 
                                   myDepth = depth; 
                                   myHeight = height; 
                                 }

    void                         setStamping(int stamp)
                                 { myStampColor = stamp; }
    void                         setColor(const UT_Vector3 &cd) 
                                 { myColor = cd; }

    void                         setOrientation(const UT_Vector3 &orig,
                    const UT_Vector3 &dir, const UT_Vector3 &upvector,
                    float rad, float angle, float squash);

    void                         setSoftEdge(float softedge, 
                                            TS_MetaKernel *kernel);

    void                         toBrushSpace(UT_Vector3 &pos);
    float                        getBrushDist2(const UT_Vector3 &pos);

    void                         setSplatter(float brush, float paper)
                                 { myPaperNoise = paper; myBrushNoise = brush; }

    // Finds the amount of splatter to apply to the given worldspace
    // coordinate.
    float                        getSplatter(const UT_Vector3 &pos);

    void                         getOrientation(UT_Matrix3 &orient) const
                                 { orient = myOrient; }

protected:
    float                        myOpacity, myInvRadius, myInvRadius2;
    float                        myRadius, myRadius2;
    bool                         myUseDepth;
    float                        myDepth;       // How deep we will apply.
    float                        myHeight;      // How high we will apply.
    float                        myAngle, mySquash;
    UT_Vector3                   myOrig, myDir, myUpVector;
    UT_Matrix3                   myOrient;      // This is from world space
                                                // to normalized brush space
    float                        myPaperNoise, myBrushNoise;

    UT_Vector3                   myColor;       // Nib's base colour.
    int                          myStampColor;  // Apply colour to stencil?
    // This is the percentage of the nib that should have a soft
    // edge applied.
    float                        mySoftEdge;
    TS_MetaKernel               *myKernel;
};

class GU_API GU_BrushNibSquare : public GU_BrushNib
{
public:
    GU_BrushNibSquare();
    virtual ~GU_BrushNibSquare();

    virtual float                getAlpha(const UT_Vector3 &pos);
};

class GU_API GU_BrushNibBitmap : public GU_BrushNib
{
public:
    GU_BrushNibBitmap();
    virtual ~GU_BrushNibBitmap();

    virtual float                getAlphaColor(const UT_Vector3 &pos, 
                                                UT_Vector3 &cd);


    void                         setRaster(TIL_TextureMap *raster);
    void                         setRasterChan(GU_BrushBitmapChan chanidx)
                                 { myChannel = chanidx; }

    virtual float                getAlpha(const UT_Vector3 &pos);

protected:
    float                        getAlphaFromColor(const UT_Vector4 &clr) const;
    
    TIL_TextureMap      *myRaster;
    GU_BrushBitmapChan   myChannel;
};


#endif

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