126 lines
4.3 KiB
C++
126 lines
4.3 KiB
C++
//----------------------------------------------------------------------------//
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// //
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// ozz-animation is hosted at http://github.com/guillaumeblanc/ozz-animation //
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// and distributed under the MIT License (MIT). //
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// //
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// Copyright (c) Guillaume Blanc //
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// //
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// Permission is hereby granted, free of charge, to any person obtaining a //
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// copy of this software and associated documentation files (the "Software"), //
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// to deal in the Software without restriction, including without limitation //
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// the rights to use, copy, modify, merge, publish, distribute, sublicense, //
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// and/or sell copies of the Software, and to permit persons to whom the //
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// Software is furnished to do so, subject to the following conditions: //
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// //
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// The above copyright notice and this permission notice shall be included in //
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// all copies or substantial portions of the Software. //
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// //
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR //
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, //
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL //
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER //
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING //
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER //
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// DEALINGS IN THE SOFTWARE. //
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// //
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//----------------------------------------------------------------------------//
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#ifndef OZZ_OZZ_BASE_MATHS_MATH_EX_H_
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#define OZZ_OZZ_BASE_MATHS_MATH_EX_H_
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#include <cassert>
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#include <cmath>
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#include "ozz/base/platform.h"
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namespace ozz {
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namespace math {
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// Returns the linear interpolation of _a and _b with coefficient _f.
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// _f is not limited to range [0,1].
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OZZ_INLINE float Lerp(float _a, float _b, float _f) {
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return (_b - _a) * _f + _a;
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}
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// Returns the minimum of _a and _b. Comparison's based on operator <.
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template <typename _Ty>
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OZZ_INLINE _Ty Min(_Ty _a, _Ty _b) {
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return (_a < _b) ? _a : _b;
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}
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// Returns the maximum of _a and _b. Comparison's based on operator <.
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template <typename _Ty>
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OZZ_INLINE _Ty Max(_Ty _a, _Ty _b) {
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return (_b < _a) ? _a : _b;
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}
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// Clamps _x between _a and _b. Comparison's based on operator <.
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// Result is unknown if _a is not less or equal to _b.
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template <typename _Ty>
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OZZ_INLINE _Ty Clamp(_Ty _a, _Ty _x, _Ty _b) {
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const _Ty min = _x < _b ? _x : _b;
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return min < _a ? _a : min;
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}
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// Implements int selection, avoiding branching.
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OZZ_INLINE int Select(bool _b, int _true, int _false) {
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return _false ^ (-static_cast<int>(_b) & (_true ^ _false));
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}
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// Implements float selection, avoiding branching.
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OZZ_INLINE float Select(bool _b, float _true, float _false) {
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union {
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float f;
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int32_t i;
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} t = {_true};
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union {
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float f;
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int32_t i;
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} f = {_false};
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union {
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int32_t i;
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float f;
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} r = {f.i ^ (-static_cast<int32_t>(_b) & (t.i ^ f.i))};
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return r.f;
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}
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// Implements pointer selection, avoiding branching.
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template <typename _Ty>
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OZZ_INLINE _Ty* Select(bool _b, _Ty* _true, _Ty* _false) {
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union {
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_Ty* p;
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intptr_t i;
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} t = {_true};
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union {
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_Ty* p;
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intptr_t i;
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} f = {_false};
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union {
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intptr_t i;
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_Ty* p;
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} r = {f.i ^ (-static_cast<intptr_t>(_b) & (t.i ^ f.i))};
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return r.p;
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}
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// Implements const pointer selection, avoiding branching.
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template <typename _Ty>
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OZZ_INLINE const _Ty* Select(bool _b, const _Ty* _true, const _Ty* _false) {
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union {
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const _Ty* p;
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intptr_t i;
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} t = {_true};
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union {
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const _Ty* p;
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intptr_t i;
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} f = {_false};
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union {
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intptr_t i;
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const _Ty* p;
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} r = {f.i ^ (-static_cast<intptr_t>(_b) & (t.i ^ f.i))};
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return r.p;
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}
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} // namespace math
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} // namespace ozz
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#endif // OZZ_OZZ_BASE_MATHS_MATH_EX_H_
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