/*---------------------------------------------------------------------------*
  Project:  NintendoWare
  File:     snd_CurveLfo.cpp
  
  Copyright (C)2009-2011 Nintendo/HAL Laboratory, Inc.  All rights reserved.
  
  These coded instructions, statements, and computer programs contain proprietary
  information of Nintendo and/or its licensed developers and are protected by
  national and international copyright laws. They may not be disclosed to third
  parties or copied or duplicated in any form, in whole or in part, without the
  prior written consent of Nintendo.
  
  The content herein is highly confidential and should be handled accordingly.
  
  $Revision: 31311 $
 *---------------------------------------------------------------------------*/

#include "precompiled.h"

#include <nw/snd/snd_CurveLfo.h>
#include <nw/assert.h>

namespace nw {
namespace snd {
namespace internal {

/* ========================================================================
        public function
   ======================================================================== */

/*---------------------------------------------------------------------------*
  Name:         LfoParam::Init

  Description:  LFOパラメータ構造体を初期化します

  Arguments:    None.

  Returns:      None.
 *---------------------------------------------------------------------------*/
void CurveLfoParam::Initialize()
{
    depth  = 0.0f;
    range  = 1;
    speed  = 6.25f;
    delay  = 0;
}

/*---------------------------------------------------------------------------*
  Name:         Reset

  Description:  LFOをリセットします

  Arguments:    なし

  Returns:      なし
 *---------------------------------------------------------------------------*/
void CurveLfo::Reset()
{
    m_Counter = 0.0f;
    m_DelayCounter = 0;
}

/*---------------------------------------------------------------------------*
  Name:         Update

  Description:  LFOを更新します

  Arguments:    msec - 更新時間[msec]

  Returns:      なし
 *---------------------------------------------------------------------------*/
void CurveLfo::Update( int msec )
{
    if ( m_DelayCounter < m_Param.delay )
    {
        if ( m_DelayCounter + msec <= m_Param.delay )
        {
            m_DelayCounter += msec;
            return;
        }
        else
        {
            msec -= m_Param.delay - m_DelayCounter;
            m_DelayCounter = m_Param.delay;
        }
    }

    m_Counter += m_Param.speed * msec / 1000.0f;
    m_Counter -= static_cast<int>( m_Counter );
}

/*---------------------------------------------------------------------------*
  Name:         GetValue

  Description:  現在のLFO値を取得します

  Arguments:    なし

  Returns:      現在のLFO値
 *---------------------------------------------------------------------------*/
f32 CurveLfo::GetValue() const
{
    if ( m_Param.depth == 0.0f ) return 0.0f;
    if ( m_DelayCounter < m_Param.delay ) return 0.0f;

    f32 value = GetSinIdx( static_cast<int>( m_Counter * TABLE_SIZE * 4 ) ) / 127.0f;
    value *= m_Param.depth;
    value *= m_Param.range ;

    return value;
}

s8 CurveLfo::GetSinIdx( int index )
{
    //  LFO用サイン波テーブル
    static const s8 sinTable[ TABLE_SIZE + 1 ] =
    {
           0,    6,   12,   19,   25,   31,   37,   43,
          49,   54,   60,   65,   71,   76,   81,   85,
          90,   94,   98,  102,  106,  109,  112,  115,
         117,  120,  122,  123,  125,  126,  126,  127,
         127
    };

    NW_MINMAXLT_ASSERT( index, 0, PERIOD );

    if ( index < TABLE_SIZE )
    {
        return sinTable[ index ];
    }
    if ( index < TABLE_SIZE * 2 )
    {
        return sinTable[ TABLE_SIZE - ( index - TABLE_SIZE ) ];
    }
    if ( index < TABLE_SIZE * 3 )
    {
        return static_cast<s8>( - sinTable[ index - TABLE_SIZE * 2 ] );
    }
    return static_cast<s8>( - sinTable[ TABLE_SIZE - ( index - TABLE_SIZE * 3 ) ] );
}

} // namespace nw::snd::internal
} // namespace nw::snd
} // namespace nw