ASound.cpp

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#include "pch.h"
#include "ASound.h"
 
//-----------------------------------------------------------------------------
// Enables memory debugging.
// Note: Should be the last include!
//-----------------------------------------------------------------------------
#include "Core/TMemoryDebugOn.h"
 
TOSHI_NAMESPACE_USING
 
ASound::ASound()
    : m_iFlags( 0 ), m_iId( 0 ), m_uiCategoryIndex( 0 ), m_ui8Priority( 255 ), m_fMinDist( 1.0f ), m_vecSamples( AMemory::GetAllocator( AMemory::POOL_Sound ), 1, 1 ), m_vecTracks( AMemory::GetAllocator( AMemory::POOL_Sound ), 1, 1 )
{
}
 
TINT ASound::GetFirstWaveForTrack( TINT a_iTrack ) const
{
    TINT iFirstWaveIndex = 0;
    for ( TINT iTrack = 0; iTrack < a_iTrack; iTrack++ )
        iFirstWaveIndex += m_vecTracks[ iTrack ];
 
    return iFirstWaveIndex;
}
 
TINT ASound::GetRandomSample( TINT a_iWaveIndexMin, TINT a_iWaveIndexMax )
{
    return a_iWaveIndexMin + ARandom::GetSingleton()->m_oRandom.GetInt( a_iWaveIndexMax - a_iWaveIndexMin );
}
 
TINT ASound::GetRandomSampleWeighted( TINT a_iTrackIndex, TINT a_iWaveIndexMin, TINT a_iWaveIndexMax )
{
    TASSERT( a_iTrackIndex != -1 );
    TASSERT( a_iWaveIndexMax - a_iWaveIndexMin > 0 );
 
    TINT  iNumWaves      = a_iWaveIndexMax - a_iWaveIndexMin;
    TINT  iTrackNumWaves = m_vecTracks[ a_iTrackIndex ];
    TINT* pWeights       = new ( AMemory::GetMemBlock( AMemory::POOL_Sound ) ) TINT[ iTrackNumWaves ];
 
    TINT iTotalWeight = 0;
    for ( TINT i = 0; i < a_iWaveIndexMax - a_iWaveIndexMin; i++ )
    {
        pWeights[ i ] = m_vecSamples[ i + a_iWaveIndexMin ].iWeight;
        iTotalWeight += pWeights[ i ];
    }
 
    TINT* pWeightedSamples = new ( AMemory::GetMemBlock( AMemory::POOL_Sound ) ) TINT[ iTotalWeight ];
    for ( TINT i = 0, j = 0; i < a_iWaveIndexMax - a_iWaveIndexMin; i++ )
    {
        // Copy sample index N (weight) times to the array
        for ( TINT k = 0; k < pWeights[ i ]; k++ )
        {
            TASSERT( j < iTotalWeight );
            pWeightedSamples[ j++ ] = a_iWaveIndexMin + i;
        }
    }
 
    TINT iSelectedSample = ARandom::GetSingleton()->m_oRandom.GetInt( iTotalWeight );
 
    delete[] pWeights;
    delete[] pWeightedSamples;
 
    return iSelectedSample;
}