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137 lines
3.6 KiB
C++
137 lines
3.6 KiB
C++
///////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2006, 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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//---------------------------------------------------------------------------
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//
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// b44ExpLogTable
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//
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// A program to generate lookup tables for
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//
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// y = exp (x / 8)
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//
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// and
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// x = 8 * log (x);
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//
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// where x and y are 16-bit floating-point numbers
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//
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// The tables are used by class B44Compressor.
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//
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//---------------------------------------------------------------------------
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#include <half.h>
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#include <math.h>
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#include <iostream>
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#include <iomanip>
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using namespace std;
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//---------------------------------------------
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// Main - prints the half-to-float lookup table
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//---------------------------------------------
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int
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main ()
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{
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#ifndef HAVE_IOS_BASE
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cout.setf (ios::hex, ios::basefield);
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#else
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cout.setf (ios_base::hex, ios_base::basefield);
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#endif
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cout << "//\n"
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"// This is an automatically generated file.\n"
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"// Do not edit.\n"
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"//\n\n";
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const int iMax = (1 << 16);
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cout << "const unsigned short expTable[] =\n"
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"{\n"
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" ";
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for (int i = 0; i < iMax; i++)
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{
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half h;
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h.setBits (i);
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if (!h.isFinite())
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h = 0;
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else if (h >= 8 * log (HALF_MAX))
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h = HALF_MAX;
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else
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h = exp (h / 8);
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cout << "0x" << setfill ('0') << setw (4) << h.bits() << ", ";
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if (i % 8 == 7)
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{
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cout << "\n";
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if (i < iMax - 1)
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cout << " ";
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}
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}
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cout << "};\n\n";
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cout << "const unsigned short logTable[] =\n"
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"{\n"
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" ";
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for (int i = 0; i < iMax; i++)
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{
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half h;
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h.setBits (i);
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if (!h.isFinite() || h < 0)
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h = 0;
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else
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h = 8 * log (h);
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cout << "0x" << setfill ('0') << setw (4) << h.bits() << ", ";
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if (i % 8 == 7)
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{
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cout << "\n";
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if (i < iMax - 1)
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cout << " ";
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}
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}
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cout << "};\n";
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return 0;
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}
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