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182 lines
4.2 KiB
C++
182 lines
4.2 KiB
C++
///////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
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// Digital Ltd. LLC
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// 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
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Industrial Light & Magic nor the names of
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// 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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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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///////////////////////////////////////////////////////////////////////////
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#include "ImathFun.h"
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namespace Imath {
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float
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succf (float f)
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{
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union {float f; int i;} u;
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u.f = f;
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if ((u.i & 0x7f800000) == 0x7f800000)
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{
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// Nan or infinity; don't change value.
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}
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else if (u.i == 0x00000000 || u.i == 0x80000000)
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{
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// Plus or minus zero.
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u.i = 0x00000001;
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}
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else if (u.i > 0)
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{
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// Positive float, normalized or denormalized.
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// Incrementing the largest positive float
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// produces +infinity.
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++u.i;
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}
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else
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{
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// Negative normalized or denormalized float.
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--u.i;
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}
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return u.f;
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}
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float
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predf (float f)
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{
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union {float f; int i;} u;
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u.f = f;
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if ((u.i & 0x7f800000) == 0x7f800000)
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{
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// Nan or infinity; don't change value.
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}
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else if (u.i == 0x00000000 || u.i == 0x80000000)
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{
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// Plus or minus zero.
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u.i = 0x80000001;
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}
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else if (u.i > 0)
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{
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// Positive float, normalized or denormalized.
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--u.i;
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}
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else
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{
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// Negative normalized or denormalized float.
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// Decrementing the largest negative float
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// produces -infinity.
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++u.i;
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}
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return u.f;
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}
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double
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succd (double d)
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{
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union {double d; Int64 i;} u;
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u.d = d;
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if ((u.i & 0x7ff0000000000000LL) == 0x7ff0000000000000LL)
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{
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// Nan or infinity; don't change value.
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}
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else if (u.i == 0x0000000000000000LL || u.i == 0x8000000000000000LL)
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{
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// Plus or minus zero.
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u.i = 0x0000000000000001LL;
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}
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else if (u.i > 0)
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{
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// Positive double, normalized or denormalized.
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// Incrementing the largest positive double
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// produces +infinity.
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++u.i;
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}
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else
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{
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// Negative normalized or denormalized double.
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--u.i;
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}
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return u.d;
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}
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double
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predd (double d)
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{
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union {double d; Int64 i;} u;
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u.d = d;
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if ((u.i & 0x7ff0000000000000LL) == 0x7ff0000000000000LL)
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{
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// Nan or infinity; don't change value.
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}
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else if (u.i == 0x0000000000000000LL || u.i == 0x8000000000000000LL)
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{
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// Plus or minus zero.
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u.i = 0x8000000000000001LL;
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}
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else if (u.i > 0)
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{
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// Positive double, normalized or denormalized.
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--u.i;
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}
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else
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{
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// Negative normalized or denormalized double.
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// Decrementing the largest negative double
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// produces -infinity.
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++u.i;
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}
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return u.d;
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}
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} // namespace Imath
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