func.h

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/*
 * nvbio
 * Copyright (c) 2011-2014, NVIDIA CORPORATION. All rights reserved.
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 * modification, are permitted provided that the following conditions are met:
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 *      notice, this list of conditions and the following disclaimer.
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 *      names of its contributors may be used to endorse or promote products
 *      derived from this software without specific prior written permission.
 * 
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#pragma once

#include <nvbio/basic/types.h>

namespace nvbio {
namespace bowtie2 {
namespace cuda {


struct SimpleFunc
{
    enum Type { LinearFunc = 0, LogFunc = 1, SqrtFunc = 2 };

    NVBIO_FORCEINLINE NVBIO_HOST_DEVICE
    SimpleFunc(const Type _type = LinearFunc, const float _k = 0.0f, const float _m = 1.0f) : type(_type), k(_k), m(_m) {}

    NVBIO_FORCEINLINE NVBIO_HOST_DEVICE
    int32 operator() (const int32 x) const
    {
        return int32( k + m * (type == LogFunc  ?  logf(float(x)) :
                               type == SqrtFunc ? sqrtf(float(x)) :
                                                        float(x)) );
    }

    const char* type_string() const
    {
        return type == LogFunc  ? "log" :
               type == SqrtFunc ? "sqrt" :
                                  "linear";
    }
    const char* type_symbol() const
    {
        return type == LogFunc  ? "G" :
               type == SqrtFunc ? "S" :
                                  "L";
    }

    Type  type;
    float k;
    float m;
};


} // namespace cuda
} // namespace bowtie2
} // namespace nvbio