/*
* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
* its licensors.
*
* For complete copyright and license terms please see the LICENSE at the root of this
* distribution (the "License"). All use of this software is governed by the License,
* or, if provided, by the license below or the license accompanying this file. Do not
* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*
*/
// Original file Copyright Crytek GMBH or its affiliates, used under license.

#ifndef CRYINCLUDE_CRYCOMMONTOOLS_EXPORT_EXPORTHELPERS_H
#define CRYINCLUDE_CRYCOMMONTOOLS_EXPORT_EXPORTHELPERS_H
#pragma once


#include <cmath>

namespace ExportHelpers
{
    inline void GenerateTextureCoordinates(float* const res_s, float* const res_t, const float x, const float y, const float z)
    {
        const float ax = ::fabs(x);
        const float ay = ::fabs(y);
        const float az = ::fabs(z);

        float s = 0.0f;
        float t = 0.0f;

        if (ax > 1e-3f || ay > 1e-3f || az > 1e-3f)
        {
            if (ax > ay)
            {
                if (ax > az)
                {
                    // X rules
                    s = y / ax;
                    t = z / ax;
                }
                else
                {
                    // Z rules
                    s = x / az;
                    t = y / az;
                }
            }
            else
            {
                // ax <= ay
                if (ay > az)
                {
                    // Y rules
                    s = x / ay;
                    t = z / ay;
                }
                else
                {
                    // Z rules
                    s = x / az;
                    t = y / az;
                }
            }
        }

        // Now the texture coordinates are in the range [-1,1].
        // We want normalized [0,1] texture coordinates.
        s = (s + 1) * 0.5f;
        t = (t + 1) * 0.5f;

        if (res_s)
        {
            *res_s = s;
        }
        if (res_t)
        {
            *res_t = t;
        }
    }
}

#endif // CRYINCLUDE_CRYCOMMONTOOLS_EXPORT_EXPORTHELPERS_H