void RebuildNoise()
{
uint size = m_handMadeBlueNoise.Width;
uint halfSize = size >> 1;
//////////////////////////////////////////////////////////////////////////
// Reconstruct an artificial spectrum
Complex[,] handmadeSpectrum = new Complex[m_handMadeBlueNoise.Width, m_handMadeBlueNoise.Height];
CreateNoiseSpectrum(handmadeSpectrum);
//CreateTestSpectrum( handmadeSpectrum );
//////////////////////////////////////////////////////////////////////////
// Reconstruct a hand-made "blue noise"
Complex[,] handMadeBlueNoise = new Complex[m_handMadeBlueNoise.Width, m_handMadeBlueNoise.Height];
m_FFT.FFT_Inverse(handmadeSpectrum, handMadeBlueNoise);
// m_FFT.FFT_Inverse( output, handMadeBlueNoise );
//////////////////////////////////////////////////////////////////////////
// Build the resulting images
m_handMadeSpectrum.WritePixels((uint X, uint Y, ref float4 _color) => {
uint Yoff = (Y + halfSize) & (size - 1);
uint Xoff = (X + halfSize) & (size - 1);
float R = (float)handmadeSpectrum[Xoff, Yoff].r;
R *= 1.0f * size;
R = Math.Abs(R);
// float I = (float) handmadeSpectrum[Xoff,Yoff].i;
// I *= 2.0f * size;
_color.Set(R, R, R, 1.0f);
});
// Hand-made blue noise
m_handMadeBlueNoise.WritePixels((uint X, uint Y, ref float4 _color) => {
float R = (float)handMadeBlueNoise[X, Y].r;
float I = (float)handMadeBlueNoise[X, Y].i;
_color.Set(R, R, R, 1.0f);
});
UpdatePanels();
}
private void Convert(bool _centralValue, float _signX, float _signY)
{
// Initialize gradient filter
Complex[,] dx = new Complex[m_size, m_size];
Complex[,] dy = new Complex[m_size, m_size];
Array.Clear(dx, 0, (int)(m_size * m_size));
Array.Clear(dy, 0, (int)(m_size * m_size));
if (_centralValue)
{
// Central-difference
dx[m_size - 1, 0].Set(-_signX, 0);
dx[1, 0].Set(_signX, 0);
dy[0, m_size - 1].Set(_signY, 0);
dy[0, 1].Set(-_signY, 0);
}
else
{
// One-sided difference
dx[0, 0].Set(-_signX, 0);
dx[1, 0].Set(_signX, 0);
dy[0, 0].Set(_signY, 0);
dy[0, 1].Set(-_signY, 0);
}
// Apply forward Fourier transform to obtain spectrum
SharpMath.FFT.FFT2D_GPU FFT = new SharpMath.FFT.FFT2D_GPU(m_device, m_size);
Complex[,] NX = FFT.FFT_Forward(nx);
Complex[,] NY = FFT.FFT_Forward(ny);
Complex[,] DX = FFT.FFT_Forward(dx);
Complex[,] DY = FFT.FFT_Forward(dy);
// Compute de-convolution
float factor = m_imageNormal.Width * m_imageNormal.Height;
Complex[,] H = new Complex[m_size, m_size];
Complex temp = new Complex(), sqrtTemp;
for (uint Y = 0; Y < m_size; Y++)
{
for (uint X = 0; X < m_size; X++)
{
#if !F**K
double sqNX = NX[X, Y].SquareMagnitude;
double sqNY = NY[X, Y].SquareMagnitude;
double num = sqNX + sqNY;
double sqDX = DX[X, Y].SquareMagnitude;
double sqDY = DY[X, Y].SquareMagnitude;
double den = factor * (sqDX + sqDY);
temp.Set(Math.Abs(den) > 0.0 ? num / den : 0.0, 0.0);
sqrtTemp = temp.Sqrt();
H[X, Y] = sqrtTemp;
#else
Complex Nx = NX[X, Y];
Complex Ny = NY[X, Y];
Complex Dx = DX[X, Y];
Complex Dy = DY[X, Y];
double den = factor * (DX[X, Y].SquareMagnitude + DY[X, Y].SquareMagnitude);
if (Math.Abs(den) > 0.0)
{
temp = -(Dx * Nx + Dy * Ny) / den;
H[X, Y] = temp;
}
else
{
H[X, Y].Zero();
}
#endif
}
}
// Apply inverse transform
Complex[,] h = FFT.FFT_Inverse(H);
Complex heightMin = new Complex(double.MaxValue, double.MaxValue);
Complex heightMax = new Complex(-double.MaxValue, -double.MaxValue);
for (uint Y = 0; Y < m_size; Y++)
{
for (uint X = 0; X < m_size; X++)
{
Complex height = h[X, Y];
heightMin.Min(height);
heightMax.Max(height);
}
}
// Render result
if (m_imageHeight != null)
{
m_imageHeight.Dispose();
m_imageHeight = null;
}
factor = 1.0f / (float)(heightMax.r - heightMin.r);
// heightMin.r = -1.0f;
// factor = 0.5f;
m_imageHeight = new ImageFile(m_imageNormal.Width, m_imageNormal.Height, PIXEL_FORMAT.R16, new ColorProfile(ColorProfile.STANDARD_PROFILE.sRGB));
// m_imageHeight.WritePixels( ( uint X, uint Y, ref float4 _color ) => { _color.x = 1e3f * (float) H[X,Y].Magnitude; } );
// m_imageHeight.WritePixels( ( uint X, uint Y, ref float4 _color ) => { _color.x = 1e5f * (float) DX[X,Y].Magnitude; } );
m_imageHeight.WritePixels((uint X, uint Y, ref float4 _color) => { _color.x = factor * (float)(h[X, Y].r - heightMin.r); });
imagePanelHeight.Bitmap = m_imageHeight.AsBitmap;
FFT.Dispose();
}