///////////////////////////////////////////////////////////////////////////

//

// Copyright (c) 2006, Industrial Light & Magic, a division of Lucas

// Digital Ltd. LLC

// 

// All rights reserved.

// 

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

// *       Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

// *       Redistributions in binary form must reproduce the above

// copyright notice, this list of conditions and the following disclaimer

// in the documentation and/or other materials provided with the

// distribution.

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// its contributors may be used to endorse or promote products derived

// from this software without specific prior written permission. 

// 

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

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///////////////////////////////////////////////////////////////////////////

//---------------------------------------------------------------------------

//

//	b44ExpLogTable

//

//	A program to generate lookup tables for

//

//		y = exp (x / 8)

//

//	and

//		x = 8 * log (x);

//

//	where x and y are 16-bit floating-point numbers

//

//	The tables are used by class B44Compressor.

//

//---------------------------------------------------------------------------

#include <half.h>

#include <math.h>

#include <iostream>

#include <iomanip>

using namespace std;

//---------------------------------------------

// Main - prints the half-to-float lookup table

//---------------------------------------------

int

main ()

{

#ifndef HAVE_IOS_BASE

    cout.setf (ios::hex, ios::basefield);

#else

    cout.setf (ios_base::hex, ios_base::basefield);

#endif

    cout << "//\n"

	    "// This is an automatically generated file.\n"

	    "// Do not edit.\n"

	    "//\n\n";

    const int iMax = (1 << 16);

    cout << "const unsigned short expTable[] =\n"

	    "{\n"

	    "    ";

    for (int i = 0; i < iMax; i++)

    {

	half h;

	h.setBits (i);

	if (!h.isFinite())

	    h = 0;

	else if (h >= 8 * log (HALF_MAX))

	    h = HALF_MAX;

	else

	    h = exp (h / 8);

	cout << "0x" << setfill ('0') << setw (4) << h.bits() << ", ";

	if (i % 8 == 7)

	{

	    cout << "\n";

	    if (i < iMax - 1)

		cout << "    ";

	}

    }

    cout << "};\n\n";

    cout << "const unsigned short logTable[] =\n"

	    "{\n"

	    "    ";

    for (int i = 0; i < iMax; i++)

    {

	half h;

	h.setBits (i);

	if (!h.isFinite() || h < 0)

	    h = 0;

	else

	    h = 8 * log (h);

	cout << "0x" << setfill ('0') << setw (4) << h.bits() << ", ";

	if (i % 8 == 7)

	{

	    cout << "\n";

	    if (i < iMax - 1)

		cout << "    ";

	}

    }

    cout << "};\n";

    return 0;

}