IMG/IMG_TTMipSampler.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:
 *      Andrew Clinton
 *      Side Effects Software Inc
 *      477 Richmond Street West
 *      Toronto, Ontario
 *      Canada   M5V 3E7
 *      416-504-9876
 *
 * NAME:        IMG_TTMipSampler.h ( IMG Library, C++)
 *
 * COMMENTS:    A general mipmap sampler for tiled textures
 */

#ifndef __IMG_TTMipSampler__
#define __IMG_TTMipSampler__

#include "IMG_API.h"
#include <UT/UT_Vector3.h>
#include "IMG_FileTTMap.h"

class IMG_TTFilterInfo;
class IMG_TTChannel;

class IMG_API IMG_TTMipSampler {
public:
     IMG_TTMipSampler(int xres, int yres, IMG_TTChannel *ch);
    ~IMG_TTMipSampler();

    /// This method returns raw pixel data.  iu and iv are in screen space.
    void         getPixel(void *pixel, int iu, int iv);

    // These methods are used for simple non-antialiased access to the map
    void         sample(float *result, int nchan,
                        float u, float v);
    void         bilerp(float *result, int nchan,
                        float u, float v,
                        UT_FilterWrap uwrap, UT_FilterWrap vwrap,
                        float cscale);
    void         sample(float *result, int nchan,
                        float u, float v, float du, float dv,
                        const IMG_TTFilterInfo &filter,
                        const UT_Vector3 &zeqn,
                        float cscale);

private:
    float                myXres, myYres;        // Float to minimize conversions
    float                myXres5, myYres5;      // Half the xres/yres
    int                  myIXres, myIYres;      // Integer values for res
    float                myDx, myDy;    // Size of a pixel in my map
    IMG_TTChannel       *myChannel;
};

#endif

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