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84 lines
2.2 KiB
C++
84 lines
2.2 KiB
C++
/*
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* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
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* its licensors.
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*
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* For complete copyright and license terms please see the LICENSE at the root of this
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* distribution (the "License"). All use of this software is governed by the License,
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* or, if provided, by the license below or the license accompanying this file. Do not
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* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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*
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*/
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// Original file Copyright Crytek GMBH or its affiliates, used under license.
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#ifndef CRYINCLUDE_CRYCOMMONTOOLS_EXPORT_EXPORTHELPERS_H
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#define CRYINCLUDE_CRYCOMMONTOOLS_EXPORT_EXPORTHELPERS_H
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#pragma once
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#include <cmath>
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namespace ExportHelpers
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{
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inline void GenerateTextureCoordinates(float* const res_s, float* const res_t, const float x, const float y, const float z)
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{
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const float ax = ::fabs(x);
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const float ay = ::fabs(y);
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const float az = ::fabs(z);
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float s = 0.0f;
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float t = 0.0f;
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if (ax > 1e-3f || ay > 1e-3f || az > 1e-3f)
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{
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if (ax > ay)
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{
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if (ax > az)
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{
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// X rules
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s = y / ax;
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t = z / ax;
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}
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else
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{
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// Z rules
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s = x / az;
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t = y / az;
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}
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}
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else
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{
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// ax <= ay
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if (ay > az)
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{
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// Y rules
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s = x / ay;
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t = z / ay;
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}
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else
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{
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// Z rules
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s = x / az;
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t = y / az;
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}
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}
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}
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// Now the texture coordinates are in the range [-1,1].
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// We want normalized [0,1] texture coordinates.
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s = (s + 1) * 0.5f;
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t = (t + 1) * 0.5f;
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if (res_s)
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{
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*res_s = s;
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}
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if (res_t)
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{
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*res_t = t;
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}
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}
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}
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#endif // CRYINCLUDE_CRYCOMMONTOOLS_EXPORT_EXPORTHELPERS_H
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