// Copyright Contributors to the OpenImageIO project.
// SPDX-License-Identifier: Apache-2.0
// https://github.com/AcademySoftwareFoundation/OpenImageIO

#ifndef OPENIMAGEIO_IV_UTILS_H
#define OPENIMAGEIO_IV_UTILS_H

#include <OpenImageIO/oiioversion.h>

OIIO_NAMESPACE_BEGIN

/// Round up to the next power of 2
/// TODO: This should be optimized to use bit arithmetic on the ieee float
/// representation.  Once optimized and tested, move to fmath.h

inline float
ceil2f(float f)
{
    float logval = logf(f) / logf(2.0f);
    logval += 1e-6f;  // add floating point slop. this supports [0.00012207,8192]
    return powf(2.0f, ceilf(logval));
}

/// Round down to the next power of 2
/// TODO: This should be optimized to use bit arithmetic on the ieee float
/// representation.  Once optimized and tested, move to fmath.h

inline float
floor2f(float f)
{
    float logval = logf(f) / logf(2.0f);
    logval -= 1e-6f;  // add floating point slop. this supports [0.00012207,8192]
    return powf(2.0f, floorf(logval));
}

OIIO_NAMESPACE_END

#endif  // OPENIMAGEIO_IV_UTILS_H
