//--------------------------------------------------------------
// Name: CTERRAIN::FilterHeightfTempBuffer - private
// Description: Apply the erosion filter to an entire buffer
// of height values
// Arguments: -fpHeightData: the height values to be filtered
// -fFilter: the filter strength
// Return Value: None
//--------------------------------------------------------------
void CTERRAIN::FilterHeightField( float* fpHeightData, float fFilter )
{
int i;
//erode left to right
for( i=0; i<m_iSize; i++ )
FilterHeightBand( &fpHeightData[m_iSize*i], 1, m_iSize, fFilter );
//erode right to left
for( i=0; i<m_iSize; i++ )
FilterHeightBand( &fpHeightData[m_iSize*i+m_iSize-1], -1, m_iSize, fFilter );
//erode top to bottom
for( i=0; i<m_iSize; i++ )
FilterHeightBand( &fpHeightData[i], m_iSize, m_iSize, fFilter);
//erode from bottom to top
for( i=0; i<m_iSize; i++ )
FilterHeightBand( &fpHeightData[m_iSize*(m_iSize-1)+i], -m_iSize, m_iSize, fFilter );
}
/*
Erosion filter -
Erodes a terrain in all 4 directions
*/
void FilterHeightField(float* field,int size,float filter)
{
int i;
/*
Erode rows left to right
*/
for (i=0;i<size;i++)
{
FilterHeightBand(&field[size*i],1,size,filter);
}
/*
Erode rows right to left
*/
for (i=0;i<size;i++)
{
FilterHeightBand(&field[size*i+size-1],-1,size,filter);
}
/*
Erode columns top to bottom
*/
for (i=0;i<size;i++)
{
FilterHeightBand(&field[i],size,size,filter);
}
/*
Erode columns bottom to top
*/
for (i=0;i<size;i++)
{
FilterHeightBand(&field[size*(size-1)+i],-size,size,filter);
}
}
