68 lines
2.4 KiB
C
68 lines
2.4 KiB
C
/* atan2f4 -
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Copyright (C) 2006, 2007 Sony Computer Entertainment Inc.
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All rights reserved.
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Redistribution and use in source and binary forms,
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with or without modification, are permitted provided that the
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following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the Sony Computer Entertainment Inc nor the names
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of its contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef ___SIMD_MATH_ATAN2F4_H___
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#define ___SIMD_MATH_ATAN2F4_H___
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#include <simdmath.h>
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#include <altivec.h>
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#include <simdmath/atanf4.h>
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//
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// Inverse tangent function of two variables
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//
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static inline vector float
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_atan2f4 (vector float y, vector float x)
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{
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vector float res = _atanf4(divf4(y,x));
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// Use the arguments to determine the quadrant of the result:
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// if (x < 0)
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// if (y < 0)
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// res = -PI + res
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// else
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// res = PI + res
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//
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vector unsigned int yNeg = (vector unsigned int)vec_cmpgt(__vec_splatsf4(0.0f), y);
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vector unsigned int xNeg = (vector unsigned int)vec_cmpgt(__vec_splatsf4(0.0f) ,x);
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vector float bias =
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vec_sel(__vec_splatsf4(3.14159265358979323846f),
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__vec_splatsf4(-3.14159265358979323846f), yNeg);
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vector float newRes = vec_add(bias, res);
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res = vec_sel(res,newRes,xNeg);
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return res;
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}
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#endif
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