/* -*- c++ -*- */

/*

 * Copyright 2004 Free Software Foundation, Inc.

 * 

 * This file is part of GNU Radio

 * 

 * GNU Radio is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 3, or (at your option)

 * any later version.

 * 

 * GNU Radio is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 * 

 * You should have received a copy of the GNU General Public License

 * along with GNU Radio; see the file COPYING.  If not, write to

 * the Free Software Foundation, Inc., 51 Franklin Street,

 * Boston, MA 02110-1301, USA.

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <qa_gr_fxpt.h>

#include <gr_fxpt.h>

#include <cppunit/TestAssert.h>

#include <iostream>

#include <stdio.h>

#include <unistd.h>

#include <math.h>

static const float SIN_COS_TOLERANCE = 1e-5;

void

qa_gr_fxpt::t0 ()

{

  CPPUNIT_ASSERT_DOUBLES_EQUAL (M_PI/2, gr_fxpt::fixed_to_float (0x40000000), SIN_COS_TOLERANCE);

  CPPUNIT_ASSERT_DOUBLES_EQUAL (0.0,    gr_fxpt::fixed_to_float (0x00000000), SIN_COS_TOLERANCE);

  CPPUNIT_ASSERT_DOUBLES_EQUAL (-M_PI,  gr_fxpt::fixed_to_float (0x80000000), SIN_COS_TOLERANCE);

  if (0){

    /*

     * These are disabled because of some precision issues.

     *

     * Different compilers seem to have different opinions on whether

     * the calulations are done single or double (or extended)

     * precision.  Any of the answers are fine for our real purpose, but

     * sometimes the answer is off by a few bits at the bottom.

     * Hence, the disabled check.

     */

    CPPUNIT_ASSERT_EQUAL ((gr_int32) 0x40000000, gr_fxpt::float_to_fixed (M_PI/2));

    CPPUNIT_ASSERT_EQUAL ((gr_int32) 0,          gr_fxpt::float_to_fixed (0));

    CPPUNIT_ASSERT_EQUAL ((gr_int32) 0x80000000, gr_fxpt::float_to_fixed (-M_PI));

  }

}

void

qa_gr_fxpt::t1 ()

{

  CPPUNIT_ASSERT_DOUBLES_EQUAL ( 0,           gr_fxpt::sin (0x00000000), SIN_COS_TOLERANCE);

  CPPUNIT_ASSERT_DOUBLES_EQUAL ( 0.707106781, gr_fxpt::sin (0x20000000), SIN_COS_TOLERANCE);

  CPPUNIT_ASSERT_DOUBLES_EQUAL ( 1,           gr_fxpt::sin (0x40000000), SIN_COS_TOLERANCE);

  CPPUNIT_ASSERT_DOUBLES_EQUAL ( 0.707106781, gr_fxpt::sin (0x60000000), SIN_COS_TOLERANCE);

  CPPUNIT_ASSERT_DOUBLES_EQUAL ( 0,           gr_fxpt::sin (0x7fffffff), SIN_COS_TOLERANCE);

  CPPUNIT_ASSERT_DOUBLES_EQUAL ( 0,           gr_fxpt::sin (0x80000000), SIN_COS_TOLERANCE);

  CPPUNIT_ASSERT_DOUBLES_EQUAL ( 0,           gr_fxpt::sin (0x80000001), SIN_COS_TOLERANCE);

  CPPUNIT_ASSERT_DOUBLES_EQUAL (-1,           gr_fxpt::sin (-0x40000000), SIN_COS_TOLERANCE);

  CPPUNIT_ASSERT_DOUBLES_EQUAL (-0.707106781, gr_fxpt::sin (-0x20000000), SIN_COS_TOLERANCE);

  for (float p = -M_PI; p < M_PI; p += 2 * M_PI / 3600){

    float expected = sin (p);

    float actual = gr_fxpt::sin (gr_fxpt::float_to_fixed (p));

    CPPUNIT_ASSERT_DOUBLES_EQUAL (expected, actual, SIN_COS_TOLERANCE);

  }

}

void

qa_gr_fxpt::t2 ()

{

  for (float p = -M_PI; p < M_PI; p += 2 * M_PI / 3600){

    float expected = cos (p);

    float actual = gr_fxpt::cos (gr_fxpt::float_to_fixed (p));

    CPPUNIT_ASSERT_DOUBLES_EQUAL (expected, actual, SIN_COS_TOLERANCE);

  }

}

void

qa_gr_fxpt::t3 ()

{

}