ltiSinCos.h

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/*
 * Copyright (C) 2005, 2006
 * Peter Doerfler
 *
 * This file is part of the LTI-Computer Vision Library (LTI-Lib)
 *
 * The LTI-Lib is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License (LGPL)
 * as published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * The LTI-Lib 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the LTI-Lib; see the file LICENSE.  If
 * not, write to the Free Software Foundation, Inc., 59 Temple Place -
 * Suite 330, Boston, MA 02111-1307, USA.
 */


/*----------------------------------------------------------------
 * project ....: LTI Digital Image/Signal Processing Library
 * file .......: ltiSinCos.h
 * authors ....: Peter Doerfler
 * organization: 
 * creation ...: 27.10.2005
 * revisions ..: $Id: ltiSinCos.h,v 1.6 2007/01/10 02:26:23 alvarado Exp $
 */

#ifndef _LTI_SIN_COS_H_
#define _LTI_SIN_COS_H_

#include "ltiTypes.h"
#include "ltiMacroSymbols.h"
#include <cmath>

/**
 * \file ltiSinCos.h Contains platform and/or compiler specific implementations
 * of sincos, sincosf, and sincosl - always appending _impl to the name. Don't
 * use this file directly but include ltiMath.h instead which provides a
 * template functions sincos()
 */

namespace lti {

  // structure: first level: compiler, possibly second level with
  // machine type needed.

  // MacOSX somehow misses sincos() and sincosf()
#if defined(_LTI_GNUC_3) && !(defined(_LTI_MACOSX))

  // just wrap for constistency

  /**
   * Calculate the sine and cosine values of \p angle in one step if
   * the setup allows it.
   */
  void inline sincos_impl(double angle, double& sval, double& cval) {
    ::sincos(angle, &sval, &cval);
  }

  /**
   * Calculate the sine and cosine values of \p angle in one step if
   * the setup allows it.
   */
  void inline sincosf_impl(float angle, float& sval, float& cval) {
    ::sincosf(angle, &sval, &cval);
  }

#elif defined(_LTI_MSC_VER)

  // inline asm implementations

  /**
   * Calculate the sine and cosine values of \p angle in one step if
   * the setup allows it.
   */
  void inline sincos_impl(double angle, double& sval, double& cval) {
    __asm {
  
      fld QWORD PTR [angle]
      fsincos
      mov ebx, [cval]
      fstp QWORD PTR [ebx]
      mov ebx, [sval]
      fstp QWORD PTR [ebx]
    }  
  }

  /**
   * Calculate the sine and cosine values of \p angle in one step if
   * the setup allows it.
   */
  void inline sincosf_impl(float angle, float& sval, float& cval) {
    __asm {
  
      fld DWORD PTR [angle]
      fsincos
      mov ebx, [cval]
      fstp DWORD PTR [ebx]
      mov ebx, [sval]
      fstp DWORD PTR [ebx]
    }  
  }

#else

  // don't know how to do this right so just do the simple thing
  void inline sincos_impl(double angle, double& sval, double& cval) {
    sval = sin(angle);
    cval = cos(angle);
  }
  void inline sincosf_impl(float angle, float& sval, float& cval) {
    sval = sin(angle);
    cval = cos(angle);
  }

#endif // compilers

}

#endif // _LTI_SIN_COS_H