/// <summary>
/// Calculate the square root of a complex number
/// </summary>
/// <param name="c"></param>
/// <returns></returns>
static public ComplexF Sqrt( ComplexF c ) {
double x = c.Re;
double y = c.Im;
double modulus = Math.Sqrt( x*x + y*y );
int sign = ( y < 0 ) ? -1 : 1;
c.Re = (float)( _halfOfRoot2 * Math.Sqrt( modulus + x ) );
c.Im = (float)( _halfOfRoot2 * sign * Math.Sqrt( modulus - x ) );
return c;
}
//---------------------------------------------------------------------------------------------------
/// <summary>
/// Calculate the power of a complex number
/// </summary>
/// <param name="c"></param>
/// <param name="exponent"></param>
/// <returns></returns>
public static ComplexF Pow( ComplexF c, double exponent )
{
double x = c.Re;
double y = c.Im;
double modulus = Math.Pow( x*x + y*y, exponent * 0.5 );
double argument = Math.Atan2( y, x ) * exponent;
c.Re = (float)( modulus * System.Math.Cos( argument ) );
c.Im = (float)( modulus * System.Math.Sin( argument ) );
return c;
}
static private ComplexF SumRecursion( ComplexF[] data, int start, int end ) {
Debug.Assert( 0 <= start, "start = " + start );
Debug.Assert( start < end, "start = " + start + " and end = " + end );
Debug.Assert( end <= data.Length, "end = " + end + " and data.Length = " + data.Length );
if( ( end - start ) <= 1000 ) {
ComplexF sum = ComplexF.Zero;
for( int i = start; i < end; i ++ ) {
sum += data[ i ];
}
return sum;
}
else {
int middle = ( start + end ) >> 1;
return SumRecursion( data, start, middle ) + SumRecursion( data, middle, end );
}
}
/// <summary>
/// Determine whether the elements in the two arrays are the same
/// </summary>
/// <param name="array1"></param>
/// <param name="array2"></param>
/// <param name="tolerance"></param>
/// <returns></returns>
static public bool IsEqual( ComplexF[] array1, ComplexF[] array2, float tolerance ) {
if ( array1.Length != array2.Length ) {
return false;
}
for( int i = 0; i < array1.Length; i ++ ) {
if( ComplexF.IsEqual( array1[i], array2[i], tolerance ) == false ) {
return false;
}
}
return true;
}
/// <summary>
/// Compute a 2D fast fourier transform on a data set of complex numbers
/// </summary>
/// <param name="data"></param>
/// <param name="xLength"></param>
/// <param name="yLength"></param>
/// <param name="direction"></param>
public static void FFT2( ComplexF[] data, int xLength, int yLength, FourierDirection direction ) {
int xInc = 1;
int yInc = xLength;
if( xLength > 1 ) {
SyncLookupTableLength( xLength );
for( int y = 0; y < yLength; y ++ ) {
int xStart = y * yInc;
LinearFFT_Quick( data, xStart, xInc, xLength, direction );
}
}
if( yLength > 1 ) {
SyncLookupTableLength( yLength );
for( int x = 0; x < xLength; x ++ ) {
int yStart = x * xInc;
LinearFFT_Quick( data, yStart, yInc, yLength, direction );
}
}
}
/// <summary>
/// Shift (offset) the elements in the array
/// </summary>
/// <param name="array"></param>
/// <param name="offset"></param>
static public void Shift( ComplexF[] array, int offset ) {
Debug.Assert( array != null );
Debug.Assert( offset >= 0 );
Debug.Assert( offset < array.Length );
if( offset == 0 ) {
return;
}
int length = array.Length;
ComplexF[] workspace = null;
ComplexArray.LockWorkspaceF( length, ref workspace );
for( int i = 0; i < length; i ++ ) {
workspace[ ( i + offset ) % length ] = array[ i ];
}
for( int i = 0; i < length; i ++ ) {
array[ i ] = workspace[ i ];
}
ComplexArray.UnlockWorkspaceF( ref workspace );
}
public static Complex ToSysComplex(ComplexF d)
{
return(new Complex(d.x, d.y));
}
private static void mulComplex(ref ComplexF sourceA, ref ComplexF sourceB, ref ComplexF destination)
{
destination.Re = sourceA.Re * sourceB.Re;
destination.Im = sourceA.Im * sourceB.Im;
}
/// <summary>
/// Divide each element in target array with corresponding element in rhs array
/// </summary>
/// <param name="target"></param>
/// <param name="rhs"></param>
static public void Divide( ComplexF[] target, ComplexF[] rhs ) {
ComplexArray.Divide( target, rhs, target );
}
/// <summary>
/// Invert each element in the array
/// </summary>
/// <param name="array"></param>
static public void Invert( ComplexF[] array ) {
for( int i = 0; i < array.Length; i ++ ) {
array[i] = ((ComplexF) 1 ) / array[i];
}
}
public CUBLASStatusv2 cublasCdotc(cublasHandle handle, int n, IntPtr x, int incx, IntPtr y, int incy, ref ComplexF result)
{
return(cublasCdotc_v2(handle, n, x, incx, y, incy, ref result));
}
public CUBLASStatusv2 cublasCrot(cublasHandle handle, int n, IntPtr x, int incx, IntPtr y, int incy, ref float c, ref ComplexF s)
{
return(cublasCrot_v2(handle, n, x, incx, y, incy, ref c, ref s));
}
private static extern CUBLASStatusv2 cublasCrotg_v2(cublasHandle handle, ref ComplexF a, ref ComplexF b, ref float c, ref ComplexF s);
public CUBLASStatusv2 cublasCaxpy(cublasHandle handle, int n, ref ComplexF alpha, IntPtr x, int incx, IntPtr y, int incy)
{
return(cublasCaxpy_v2(handle, n, ref alpha, x, incx, y, incy));
}
private static extern CUBLASStatusv2 cublasCrot_v2(cublasHandle handle, int n, IntPtr x, int incx, IntPtr y, int incy, ref float c, ref ComplexF s);
private static extern CUBLASStatusv2 cublasCdotc_v2(cublasHandle handle, int n, IntPtr x, int incx, IntPtr y, int incy, ref ComplexF result);
private static extern CUBLASStatusv2 cublasCaxpy_v2(cublasHandle handle, int n, ref ComplexF alpha, IntPtr x, int incx, IntPtr y, int incy);
/// <summary>
/// Multiply each element in the array by a specific value
/// </summary>
/// <param name="array"></param>
/// <param name="scale"></param>
static public void Scale( ComplexF[] array, ComplexF scale ) {
Debug.Assert( array != null );
int length = array.Length;
for( int i = 0; i < length; i ++ ) {
array[i] *= scale;
}
}
public CUBLASStatusv2 cublasCrotg(cublasHandle handle, ref ComplexF a, ref ComplexF b, ref float c, ref ComplexF s)
{
return(cublasCrotg_v2(handle, ref a, ref b, ref c, ref s));
}
/// <summary>
/// Multiply each element in target array with corresponding element in rhs array
/// </summary>
/// <param name="target"></param>
/// <param name="rhs"></param>
static public void Multiply( ComplexF[] target, ComplexF[] rhs ) {
ComplexArray.Multiply( target, rhs, target );
}
private static void convertComplexToMagnitude(ref ComplexF source, ref Gray <float> destination)
{
destination.Intensity = source.Magnitude();
}
/// <summary>
/// Copy an array
/// </summary>
/// <param name="dest"></param>
/// <param name="source"></param>
static public void Copy( ComplexF[] dest, ComplexF[] source ) {
Debug.Assert( dest != null );
Debug.Assert( source != null );
Debug.Assert( dest.Length == source.Length );
for( int i = 0; i < dest.Length; i ++ ) {
dest[i] = source[i];
}
}
static private void LockBufferCF( int length, ref ComplexF[] buffer ) {
if( length != _bufferCF.Length ) {
_bufferCF = new ComplexF[ length ];
}
buffer = _bufferCF;
}
void InitWaveGenerator()
{
// Wind restricted to one direction, reduces calculations
Vector2 wind = new Vector2 (windx, 0.0f);
// Initialize wave generator
for (int y=0; y<height; y++) {
for (int x=0; x<width; x++) {
float yc = y < height / 2f ? y : -height + y;
float xc = x < width / 2f ? x : -width + x;
Vector2 vec_k = new Vector2 (2.0f * Mathf.PI * xc / size.x, 2.0f * Mathf.PI * yc / size.z);
h0 [width * y + x] = new ComplexF (GaussianRnd (), GaussianRnd ()) * 0.707f * (float)System.Math.Sqrt (P_spectrum (vec_k, wind));
}
}
for (int y=0; y<n_height; y++) {
for (int x=0; x<n_width; x++) {
float yc = y < n_height / 2f ? y : -n_height + y;
float xc = x < n_width / 2f ? x : -n_width + x;
Vector2 vec_k = new Vector2 (2.0f * Mathf.PI * xc / (size.x / normal_scale), 2.0f * Mathf.PI * yc / (size.z / normal_scale));
n0 [n_width * y + x] = new ComplexF (GaussianRnd (), GaussianRnd ()) * 0.707f * (float)System.Math.Sqrt (P_spectrum (vec_k, wind));
}
}
}
private static void LinearFFT_Quick( ComplexF[] data, int start, int inc, int length, FourierDirection direction ) {
// copy to buffer
ComplexF[] buffer = null;
LockBufferCF( length, ref buffer );
int j = start;
for( int i = 0; i < length; i ++ ) {
buffer[ i ] = data[ j ];
j += inc;
}
FFT( buffer, length, direction );
// copy from buffer
j = start;
for( int i = 0; i < length; i ++ ) {
data[ j ] = buffer[ i ];
j += inc;
}
UnlockBufferCF( ref buffer );
}
/// <summary>
/// Swap two complex numbers
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
static public void Swap( ref ComplexF a, ref ComplexF b ) {
ComplexF temp = a;
a = b;
b = temp;
}
private static void convertGrayToComplex(ref Gray <float> source, ref ComplexF destination)
{
destination.Re = source.Intensity;
}
//-------------------------------------------------------------------------------------
static private void ReorderArray( ComplexF[] data ) {
int length = data.Length;
int[] reversedBits = GetReversedBits( Log2( length ) );
for( int i = 0; i < length; i ++ ) {
int swap = reversedBits[ i ];
if( swap > i ) {
ComplexF temp = data[ i ];
data[ i ] = data[ swap ];
data[ swap ] = temp;
}
}
}
static void Main(string[] args)
{
bool showUsage = true;
if (args.Length >= 3)
{
try
{
// todo: generalize port parsing and throw new exceptions
int inputPort = int.Parse(args[0]);
int amplitudeOutputPort = int.Parse(args[1]);
int phaseOutputPort = int.Parse(args[2]);
if (inputPort > 0 && inputPort < 65536 &&
amplitudeOutputPort > 0 && amplitudeOutputPort < 65536 &&
phaseOutputPort > 0 && phaseOutputPort < 65536
)
{
showUsage = false;
String adrs = "127.0.0.1";
if (args.Length >= 4)
{
adrs = args[3];
}
// todo: generalize address parsing and throw new exceptions
Console.WriteLine("Sending on address " + adrs);
Console.WriteLine("Receiving UDP packets on port " + inputPort);
Console.WriteLine("Sending amplitude UDP packets on port " + amplitudeOutputPort);
Console.WriteLine("Sending phase UDP packets on port " + phaseOutputPort);
UdpClient inputUdpClient = new UdpClient(inputPort);
UdpClient amplitudeUdpClient = new UdpClient(adrs, amplitudeOutputPort);
UdpClient phaseUdpClient = new UdpClient(adrs, phaseOutputPort);
try
{
while (true)
{
//IPEndPoint object will allow us to read datagrams sent from any source.
IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);
// Blocks until a message returns on this socket from a remote host.
Byte[] receiveBytes = inputUdpClient.Receive(ref RemoteIpEndPoint);
//todo:Size handling!!!
int size = 1024;
// prepare dataset from real data
List <ComplexF> cxList = new List <ComplexF>(size);
for (int i = 0; i < size; i++)
{
// unsigned byte to R=[0..1],I=0 complex number
//cxList.Add(new ComplexF((float)(receiveBytes[i]), 0));
float t = (float)(2 * Math.PI * size) / 16; // sampling rate is 16 samples/sec.
float pt = (float)(1.1 + 1.0 * Math.Sin(t) + .5 * Math.Sin(1.5 * t));
cxList.Add(new ComplexF(pt, 0));
// * */
}
// Transform in the complex array
ComplexF[] cxArray = cxList.ToArray <ComplexF>();
Fourier.FFT(cxArray, FourierDirection.Forward);
// find boundaries
ComplexF maxCx = cxArray.Max <ComplexF>();
ComplexF minCx = cxArray.Min <ComplexF>();
// remap type
List <byte> abList = new List <byte>(size);
List <byte> pbList = new List <byte>(size);
for (int i = 0; i < size; i++)
{
// also realign negative frequencies and flip amplitude
int n = (i + size / 2) % size;
abList.Add((byte)(255 - ((cxArray[n].GetModulus() * 255) / 1024))); // Amplitude [0..255]
pbList.Add((byte)((cxArray[n].GetArgument() + Math.PI) / (2 * Math.PI) * 256)); // Phase [0..255]
}
byte[] amplitude = abList.ToArray <Byte>();
byte[] phase = pbList.ToArray <Byte>();
// and send!
amplitudeUdpClient.Send(amplitude, amplitude.Length);
phaseUdpClient.Send(phase, phase.Length);
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
finally
{
inputUdpClient.Close();
amplitudeUdpClient.Close();
phaseUdpClient.Close();
}
}
}
catch (Exception e)
{
// will show usage anyway...
Console.WriteLine(e.ToString());
// todo: a friendly detailed explanation of the failure should be displayed when failing
}
}
if (showUsage)
{
Console.WriteLine("Compute spectrum. using FFT");
Console.WriteLine("USAGE: UDPSpectrum inputPort amplitudeOutputPort phaseOutputPort [sendToAddress]\n");
Console.WriteLine("Warning: This kind of transformation is don on 2^x sets, som truncation and padding may occurs!");
// todo: make a strict flag in the arguments to optionnaly reject non-conform packets
Console.WriteLine("Hit any key to exit");
Console.Read();
}
}
static private void UnlockBufferCF( ref ComplexF[] buffer ) {
buffer = null;
}
/// <summary>
/// Calculates the fast fourier transform of the image.
/// </summary>
/// <param name="image">The image to get calculate the FFT from.</param>
/// <param name="shiftAxes">Whether to perform FFTShift on the Fourier image.</param>
/// <param name="ignoreAlpha">Whether to ignore the alpha component of the image (if it is 32-bit).</param>
/// <param name="disposeImage">Whether to dispose the image after use.</param>
/// <param name="targetWidth">The height to resize the kernel to, or -1 to leave kernel same width. Can only be larger than the kernel width.</param>
/// <param name="targetHeight">The height to resize the kernel to, or -1 to leave kernel same height. Can only be larger than the kernel height.</param>
public FourierWorker(PixelWorker image, bool shiftAxes = true, bool ignoreAlpha = false, bool disposeImage = false, int targetWidth = -1, int targetHeight = -1)
{
if (image == null)
{
return;
}
int componentCount = image.ComponentCount, targetPixelCount = image.PixelCount;
if (ignoreAlpha && componentCount == 4)
{
componentCount = 3;
alphaReference = image;
alphaReference.ShallowClone();
}
values = new ComplexF[componentCount][];
ComponentCount = componentCount;
TargetWidth = image.Width;
TargetHeight = image.Height;
TargetPixelCount = image.PixelCount;
TargetPixelComponentCount = image.PixelComponentCount;
TargetSize = new Size(TargetWidth, TargetHeight);
FourierWidth = (int)Maths.CeilingPowerOfTwo((uint)(targetWidth <= TargetWidth ? TargetWidth : targetWidth));
FourierHeight = (int)Maths.CeilingPowerOfTwo((uint)(targetHeight <= TargetHeight ? TargetHeight : targetHeight));
FourierSize = new Size(FourierWidth, FourierHeight);
FourierPixelCount = FourierWidth * FourierHeight;
FourierPixelComponentCount = FourierPixelCount * ComponentCount;
fourierWidthLog2 = Maths.Log2((uint)FourierWidth);
fourierHeightLog2 = Maths.Log2((uint)FourierHeight);
ComplexF[] current;
byte comp;
int c, x = 0, y = 0, fourierWidth = FourierWidth, fourierHeight = FourierHeight, tw = TargetWidth;
int tcc = image.ComponentCount, txMinusOne = TargetWidth - 1, tyMinusOne = TargetHeight - 1;
for (c = 0; c < componentCount; c++)
{
current = new ComplexF[FourierPixelCount];
values[c] = current;
for (y = 0; y < fourierHeight; y++)
{
for (x = 0; x < fourierWidth; x++)
{
comp = image.GetPixelBgra((Math.Min(y, tyMinusOne) * tw + Math.Min(x, txMinusOne)) * tcc)[c];
if (comp > OriginalMax)
{
OriginalMax = comp;
}
current[y * fourierWidth + x] = new ComplexF()
{
Real = comp,
};
}
}
}
NormalizationCap = OriginalMax;
FFT(true);
if (shiftAxes)
{
ShiftAxes = true;
FFTShift();
}
if (disposeImage)
{
image.Dispose();
}
}
//======================================================================================
/// <summary>
/// Compute a 1D fast Fourier transform of a dataset of complex numbers.
/// </summary>
/// <param name="data"></param>
/// <param name="length"></param>
/// <param name="direction"></param>
public static void FFT( ComplexF[] data, int length, FourierDirection direction ) {
SyncLookupTableLength( length );
int ln = Log2( length );
// reorder array
ReorderArray( data );
// successive doubling
int N = 1;
int signIndex = ( direction == FourierDirection.Forward ) ? 0 : 1;
for( int level = 1; level <= ln; level ++ ) {
int M = N;
N <<= 1;
float[] uRLookup = _uRLookupF[ level, signIndex ];
float[] uILookup = _uILookupF[ level, signIndex ];
for( int j = 0; j < M; j ++ ) {
float uR = uRLookup[j];
float uI = uILookup[j];
for( int even = j; even < length; even += N ) {
int odd = even + M;
float r = data[ odd ].Re;
float i = data[ odd ].Im;
float odduR = r * uR - i * uI;
float odduI = r * uI + i * uR;
r = data[ even ].Re;
i = data[ even ].Im;
data[ even ].Re = r + odduR;
data[ even ].Im = i + odduI;
data[ odd ].Re = r - odduR;
data[ odd ].Im = i - odduI;
}
}
}
}
public FourierWorker(float[][][] kernel, bool shiftAxes = true, int targetWidth = -1, int targetHeight = -1)
{
int cc = kernel == null ? 0 : kernel.Length;
ComponentCount = cc;
float[][] k = cc == 0 ? null : kernel[0];
if (targetWidth <= 0)
{
TargetWidth = k == null ? 0 : k.Length;
FourierWidth = (int)Maths.CeilingPowerOfTwo((uint)TargetWidth);
}
else
{
TargetWidth = k == null ? 0 : k.Length;
FourierWidth = (int)Maths.CeilingPowerOfTwo((uint)(targetWidth <= TargetWidth ? TargetWidth : targetWidth));
}
if (targetHeight <= 0)
{
TargetHeight = (k == null || k.Length == 0) ? 0 : (k[0] == null ? 0 : k[0].Length);
FourierHeight = (int)Maths.CeilingPowerOfTwo((uint)TargetHeight);
}
else
{
TargetHeight = (k == null || k.Length == 0) ? 0 : (k[0] == null ? 0 : k[0].Length);
FourierHeight = (int)Maths.CeilingPowerOfTwo((uint)(targetHeight <= TargetHeight ? TargetHeight : targetHeight));
}
OriginalMax = 255;
NormalizationCap = 255;
TargetPixelCount = TargetWidth * TargetHeight;
TargetPixelComponentCount = TargetPixelCount * cc;
FourierPixelCount = FourierWidth * FourierHeight;
FourierPixelComponentCount = FourierPixelCount * cc;
fourierWidthLog2 = Maths.Log2((uint)FourierWidth);
fourierHeightLog2 = Maths.Log2((uint)FourierHeight);
TargetSize = new Size(TargetWidth, TargetHeight);
FourierSize = new Size(FourierWidth, FourierHeight);
values = new ComplexF[cc][];
int c;
for (c = 0; c < cc; c++)
{
values[c] = new ComplexF[FourierPixelCount];
}
if (kernel == null)
{
return;
}
targetWidth = TargetWidth;
targetHeight = TargetHeight;
int fourierWidth = FourierWidth;
float[] temp;
ComplexF[] current;
int x, y, xDiv, yDiv, xOffset, yOffset;
for (c = 0; c < cc; c++)
{
current = values[c];
k = kernel[c];
x = 0;
xDiv = (targetWidth & 1) == 0 ? -1 : targetWidth / 2;
xOffset = (fourierWidth - targetWidth) / 2;
while (x < targetWidth)
{
temp = k[x];
y = 0;
yOffset = (FourierHeight - targetHeight) / 2;
yDiv = (targetHeight & 1) == 0 ? -1 : targetHeight / 2;
while (y < targetHeight)
{
current[(y + yOffset) * fourierWidth + x + xOffset] = new ComplexF()
{
Real = temp[y]
};
if (y == yDiv)
{
yDiv = -1;
yOffset++;
}
else
{
y++;
}
}
if (x == xDiv)
{
xDiv = -1;
xOffset++;
}
else
{
x++;
}
}
}
FFT(true);
if (shiftAxes)
{
ShiftAxes = true;
FFTShift();
}
}
static private void UnlockWorkspaceF( ref ComplexF[] workspace ) {
Debug.Assert( _workspaceF == workspace );
//Debug.Assert( _workspaceFLocked == true );
//_workspaceFLocked = false;
workspace = null;
}
/// <summary>
/// Computes an in-place complex-to-complex FFT.
/// </summary>
private static void FFT(ComplexF[] values, long indexMultiplier, long indexOffset, int log2Length, bool forward)
{
long i, i1, k;
double u1, u2, z;
ComplexF t, temp;
long nn = 1L << log2Length;
long i2 = nn >> 1;
long j = 0L;
long nMinusOne = nn - 1L;
long index1, index2;
for (i = 0; i < nMinusOne; i++)
{
if (i < j)
{
index1 = i * indexMultiplier + indexOffset;
index2 = j * indexMultiplier + indexOffset;
t = values[index1];
values[index1] = values[index2];
values[index2] = t;
}
k = i2;
while (k <= j)
{
j -= k;
k >>= 1;
}
j += k;
}
double c1 = -1.0;
double c2 = 0.0;
long l1, l2 = 1L;
double mult = forward ? -1.0 : 1.0;
for (long l = 0L; l < log2Length; l++)
{
l1 = l2;
l2 <<= 1;
u1 = 1.0;
u2 = 0.0;
for (j = 0L; j < l1; j++)
{
for (i = j; i < nn; i += l2)
{
i1 = i + l1;
index1 = i * indexMultiplier + indexOffset;
index2 = i1 * indexMultiplier + indexOffset;
t = values[index2];
t = new ComplexF((float)(u1 * t.Real - u2 * t.Imaginary), (float)(u1 * t.Imaginary + u2 * t.Real));
temp = values[index1];
values[index2] = temp - t;
values[index1] = temp + t;
}
z = u1 * c1 - u2 * c2;
u2 = u1 * c2 + u2 * c1;
u1 = z;
}
c2 = Math.Sqrt((1.0 - c1) * 0.5) * mult;
c1 = Math.Sqrt((1.0 + c1) * 0.5);
}
if (forward)
{
float multiplier = 1f / nn;
for (i = 0L; i < nn; i++)
{
index1 = i * indexMultiplier + indexOffset;
temp = values[index1];
values[index1] = new ComplexF(temp.Real * multiplier, temp.Imaginary * multiplier);
}
}
}
/// <summary>
/// Get the range of element lengths
/// </summary>
/// <param name="array"></param>
/// <param name="minimum"></param>
/// <param name="maximum"></param>
static public void GetLengthRange( ComplexF[] array, ref float minimum, ref float maximum ) {
minimum = +float.MaxValue;
maximum = -float.MaxValue;
for( int i = 0; i < array.Length; i ++ ) {
float temp = array[i].GetModulus();
minimum = Math.Min( temp, minimum );
maximum = Math.Max( temp, maximum );
}
}
// Use this for initialization
void Start()
{
//oceansize= width * s * scale * ( max_LOD * 2 + 1 );
// normal map size
n_width = 256;
n_height = 256;
textureA = new Texture2D(n_width, n_height);
textureB = new Texture2D(n_width, n_height);
textureA.filterMode = FilterMode.Bilinear;
textureB.filterMode = FilterMode.Bilinear;
if (!SetupOffscreenRendering())
{
material_ocean.SetTexture("_BumpMap", textureA);
material_ocean.SetTextureScale("_BumpMap", new Vector2(normal_scale, normal_scale));
material_ocean.SetTexture("_BumpMap2", textureB);
material_ocean.SetTextureScale("_BumpMap2", new Vector2(normal_scale, normal_scale));
}
pixelData = new Color[n_width * n_height];
// Init the water height matrix
data = new ComplexF[width * height];
// lateral offset matrix to get the choppy waves
data_x = new ComplexF[width * height];
// tangent
t_x = new ComplexF[width * height];
t_y = new ComplexF[width * height];
n_x = new ComplexF[n_width * n_height];
n_y = new ComplexF[n_width * n_height];
// Geometry size
g_height = height + 1;
g_width = width + 1;
tiles_LOD = new List <List <Mesh> >();
for (int LOD = 0; LOD < max_LOD * max_LOD; LOD++)
{
tiles_LOD.Add(new List <Mesh>());
}
GameObject tile;
int chDist; // Chebychev distance
for (int y = 0; y < tiles_y; y++)
{
for (int x = 0; x < tiles_x; x++)
{
chDist = (int)Mathf.Max(Mathf.Abs(tiles_y / 2 - y), Mathf.Abs(tiles_x / 2 - x));
chDist = chDist > 0 ? chDist - 1 : 0;
//Debug.Log(chDist);
float cy = y - tiles_y / 2;
float cx = x - tiles_x / 2;
tile = new GameObject("Tile" + chDist);
//~ tile.transform.position.x = ;
//~ tile.transform.position.y = ;
//~ tile.transform.position.z = ;
tile.transform.position = new Vector3(Mathf.RoundToInt(cx * size.x * s), Mathf.RoundToInt(-2.0f * chDist), Mathf.RoundToInt(cy * size.z * s));
//~ tile.transform.localScale.x = s;
//~ tile.transform.localScale.y = s;
//~ tile.transform.localScale.z = s;
tile.transform.localScale = new Vector3(s, s, s);
MeshFilter filter = tile.AddComponent(typeof(MeshFilter)) as MeshFilter;
tile.AddComponent("MeshRenderer");
//~ tile.AddComponent("MeshCollider");
//~ MeshCollider col = tile.AddComponent(typeof(MeshCollider)) as MeshCollider;
//~ col.sharedMesh = filter.mesh;
//~ col.smoothSphereCollisions = true;
//~ col.convex = true;
//~ tile.AddComponent(typeof(RecalculateBounds));
tile.renderer.material = material_ocean;
//Make child of this object, so we don't clutter up the
//scene hierarchy more than necessary.
tile.transform.parent = transform;
//Also we don't want these to be drawn while doing refraction/reflection passes,
//so we'll add the to the water layer for easy filtering.
tile.layer = LayerMask.NameToLayer("Water");
// Determine which LOD the tile belongs
//~ tiles_LOD[chDist].Add ((tile.GetComponent(typeof(MeshFilter)) as MeshFilter).mesh);
tiles_LOD[chDist].Add(filter.mesh);
}
}
// Init wave spectra. One for vertex offset and another for normal map
h0 = new ComplexF[width * height];
n0 = new ComplexF[n_width * n_height];
// Wind restricted to one direction, reduces calculations
Vector2 wind = new Vector2(0.0f, windx);
// Initialize wave generator
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
float yc = y < height / 2 ? y : -height + y;
float xc = x < width / 2 ? x : -width + x;
Vector2 vec_k = new Vector2(2.0f * Mathf.PI * xc / size.x, 2.0f * Mathf.PI * yc / size.z);
h0[width * y + x] = new ComplexF(GaussianRnd(x, y), GaussianRnd(x, y)) * 0.707f * Mathf.Sqrt(P_spectrum(vec_k, wind));
}
}
for (int y = 0; y < n_height; y++)
{
for (int x = 0; x < n_width; x++)
{
float yc = y < n_height / 2 ? y : -n_height + y;
float xc = x < n_width / 2 ? x : -n_width + x;
Vector2 vec_k = new Vector2(2.0f * Mathf.PI * xc / (size.x / normal_scale), 2.0f * Mathf.PI * yc / (size.z / normal_scale));
n0[n_width * y + x] = new ComplexF(GaussianRnd(x, y), GaussianRnd(x, y)) * 0.707f * Mathf.Sqrt(P_spectrum(vec_k, wind));
}
}
GenerateHeightmap();
GenerateBumpmaps();
}
/// <summary>
/// Add a specific value to each element in the array
/// </summary>
/// <param name="array"></param>
/// <param name="offset"></param>
static public void Offset( ComplexF[] array, ComplexF offset ) {
int length = array.Length;
for( int i = 0; i < length; i ++ ) {
array[i] += offset;
}
}
// Update is called once per frame
void Update()
{
if (Input.GetKeyDown(KeyCode.P))
{
Application.CaptureScreenshot("Screenshot.png");
}
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
int idx = width * y + x;
float yc = y < height / 2 ? y : -height + y;
float xc = x < width / 2 ? x : -width + x;
Vector2 vec_k = new Vector2(2.0f * Mathf.PI * xc / size.x, 2.0f * Mathf.PI * yc / size.z);
float iwkt = disp(vec_k) * Time.time;
ComplexF coeffA = new ComplexF(Mathf.Cos(iwkt), Mathf.Sin(iwkt));
ComplexF coeffB = coeffA.GetConjugate();
int ny = y > 0 ? height - y : 0;
int nx = x > 0 ? width - x : 0;
data[idx] = h0[idx] * coeffA + h0[width * ny + nx].GetConjugate() * coeffB;
t_x[idx] = data[idx] * new ComplexF(0.0f, vec_k.x) - data[idx] * vec_k.y;
// Choppy wave calcuations
if (x + y > 0)
{
data[idx] += data[idx] * vec_k.x / vec_k.magnitude;
}
}
}
material_ocean.SetFloat("_BlendA", Mathf.Cos(Time.time) * 0.1f);
material_ocean.SetFloat("_BlendB", Mathf.Sin(Time.time) * 0.5f);
Fourier.FFT2(data, width, height, FourierDirection.Backward);
Fourier.FFT2(t_x, width, height, FourierDirection.Backward);
// Get base values for vertices and uv coordinates.
if (baseHeight == null)
{
Mesh mesh = baseMesh;
baseHeight = mesh.vertices;
baseUV = mesh.uv;
int itemCount = baseHeight.Length;
uvs = new Vector2[itemCount];
vertices = new Vector3[itemCount];
normals = new Vector3[itemCount];
tangents = new Vector4[itemCount];
}
//Vector3 vertex;
Vector3 uv;
//Vector3 normal;
float n_scale = size.x / width / scale;
float scaleA = choppy_scale / (width * height);
float scaleB = scale / (width * height);
float scaleBinv = 1.0f / scaleB;
for (int i = 0; i < width * height; i++)
{
int iw = i + i / width;
vertices[iw] = baseHeight[iw];
vertices[iw].x += data[i].Im * scaleA;
vertices[iw].y = data[i].Re * scaleB;
normals[iw] = new Vector3(t_x[i].Re, scaleBinv, t_x[i].Im).normalized;
uv = baseUV[iw];
uv.x = uv.x + Time.time * uv_speed;
uvs[iw] = uv;
if (!((i + 1) % width > 0))
{
vertices[iw + 1] = baseHeight[iw + 1];
vertices[iw + 1].x += data[i + 1 - width].Im * scaleA;
vertices[iw + 1].y = data[i + 1 - width].Re * scaleB;
normals[iw + 1] = new Vector3(t_x[i + 1 - width].Re, scaleBinv, t_x[i + 1 - width].Im).normalized;
uv = baseUV[iw + 1];
uv.x = uv.x + Time.time * uv_speed;
uvs[iw + 1] = uv;
}
}
int offset = g_width * (g_height - 1);
for (int i = 0; i < g_width; i++)
{
vertices[i + offset] = baseHeight[i + offset];
vertices[i + offset].x += data[i % width].Im * scaleA;
vertices[i + offset].y = data[i % width].Re * scaleB;
normals[i + offset] = new Vector3(t_x[i % width].Re, scaleBinv, t_x[i % width].Im).normalized;
uv = baseUV[i + offset];
uv.x = uv.x - Time.time * uv_speed;
uvs[i + offset] = uv;
}
for (int i = 0; i < g_width * g_height - 1; i++)
{
//Need to preserve w in refraction/reflection mode
if (!reflectionRefractionEnabled)
{
if (((i + 1) % g_width) == 0)
{
tangents[i] = (vertices[i - width + 1] + new Vector3(size.x, 0.0f, 0.0f) - vertices[i]).normalized;
}
else
{
tangents[i] = (vertices[i + 1] - vertices[i]).normalized;
}
tangents[i].w = 1.0f;
}
else
{
Vector3 tmp = Vector3.zero;
if (((i + 1) % g_width) == 0)
{
tmp = (vertices[i - width + 1] + new Vector3(size.x, 0.0f, 0.0f) - vertices[i]).normalized;
}
else
{
tmp = (vertices[i + 1] - vertices[i]).normalized;
}
tangents[i] = new Vector4(tmp.x, tmp.y, tmp.z, tangents[i].w);
}
}
//In reflection mode, use tangent w for foam strength
if (reflectionRefractionEnabled)
{
for (int y = 0; y < g_height; y++)
{
for (int x = 0; x < g_width; x++)
{
if (x + 1 >= g_width)
{
tangents[x + g_width * y].w = tangents[g_width * y].w;
continue;
}
if (y + 1 >= g_height)
{
tangents[x + g_width * y].w = tangents[x].w;
continue;
}
Vector3 right = vertices[(x + 1) + g_width * y] - vertices[x + g_width * y];
Vector3 back = vertices[x + g_width * y] - vertices[x + g_width * (y + 1)];
float foam = right.x / (size.x / g_width);
if (foam < 0.0f)
{
tangents[x + g_width * y].w = 1;
}
else if (foam < 0.5f)
{
tangents[x + g_width * y].w += 2 * Time.deltaTime;
}
else
{
tangents[x + g_width * y].w -= 0.5f * Time.deltaTime;
}
tangents[x + g_width * y].w = Mathf.Clamp(tangents[x + g_width * y].w / foamTime, 0.0f, 2.0f);
}
}
}
tangents[g_width * g_height - 1] = (vertices[g_width * g_height - 1] + new Vector3(size.x, 0.0f, 0.0f) - vertices[1]).normalized;
//~ LOD=0;
for (int LOD = 0; LOD < max_LOD; LOD++)
{
int den = (int)Mathf.Pow(2, LOD);
int itemcount = (height / den + 1) * (width / den + 1);
Vector4[] tangentsLOD = new Vector4[itemcount];
Vector3[] verticesLOD = new Vector3[itemcount];
Vector3[] normalsLOD = new Vector3[itemcount];
Vector2[] uvLOD = new Vector2[(height / (int)Mathf.Pow(2, LOD) + 1) * (width / (int)Mathf.Pow(2, LOD) + 1)];
int idx = 0;
for (int y = 0; y < g_height; y += den)
{
for (int x = 0; x < g_width; x += den)
{
int idx2 = g_width * y + x;
verticesLOD[idx] = vertices[idx2];
uvLOD[idx] = uvs[g_width * y + x];
tangentsLOD[idx] = tangents[idx2];
normalsLOD[idx++] = normals[idx2];
}
}
for (int k = 0; k < tiles_LOD[LOD].Count; k++)
{
Mesh meshLOD = tiles_LOD[LOD][k];
meshLOD.vertices = verticesLOD;
meshLOD.normals = normalsLOD;
meshLOD.uv = uvLOD;
meshLOD.tangents = tangentsLOD;
}
}
//oceansize=width*(max_LOD*2+1);
float width_LOD2 = 175 * s;
//transform.position.x=mycam.transform.localPosition.x;
float tmpx = Mathf.RoundToInt(mycam.transform.position.x / width_LOD2);
float tmpz = Mathf.RoundToInt(mycam.transform.position.z / width_LOD2);
tmpx = tmpx * width_LOD2 - (width_LOD2 / 2);
tmpz = tmpz * width_LOD2 - (width_LOD2 / 2);
//tmpx-=Mathf.RoundToInt(width_LOD2);
//tmpz-=Mathf.RoundToInt(width_LOD2);
//~ transform.position.x=tmpx;
//~ transform.position.z=tmpz;
transform.position = new Vector3(tmpx, transform.position.y, tmpz);
//transform.position.z=mycam.transform.localPosition.z*1000;
}
/// <summary>
/// Multiply each element in the array by a specific value
/// </summary>
/// <param name="array"></param>
/// <param name="scale"></param>
/// <param name="start"></param>
/// <param name="length"></param>
static public void Scale( ComplexF[] array, ComplexF scale, int start, int length ) {
Debug.Assert( array != null );
Debug.Assert( start >= 0 );
Debug.Assert( length >= 0 );
Debug.Assert( ( start + length ) < array.Length );
for( int i = 0; i < length; i ++ ) {
array[i + start] *= scale;
}
}
void Update()
{
//If player null, search for player by Player tag
if (player == null)
{
player = GameObject.FindGameObjectWithTag("Player").GetComponent <Transform>();
}
//Get sun reflection dir from sun object
if (sun != null)
{
SunDir = sun.transform.forward;
material.SetVector("_SunDir", SunDir);
}
if (this.renderReflection)
{
RenderObject();
}
if (followMainCamera)
{
Vector3 centerOffset;
//centerOffset.x = Mathf.Floor (player.position.x / size.x) * size.x;
//centerOffset.z = Mathf.Floor (player.position.z / size.z) * size.z;
centerOffset.y = transform.position.y;
//centerOffset.x = (((int)player.position.x + 64) & ~127);
//centerOffset.z = (((int)player.position.z + 64) & ~127);
//Optimized ocean tiles movement
centerOffset.x = Mathf.Floor((player.position.x + size.x * 0.5f) * sizeInv.x) * size.x;
centerOffset.z = Mathf.Floor((player.position.z + size.z * 0.5f) * sizeInv.y) * size.z;
if (transform.position != centerOffset)
{
transform.position = centerOffset;
}
}
float hhalf = height / 2f;
float whalf = width / 2f;
float time = Time.time;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
int idx = width * y + x;
float yc = y < hhalf ? y : -height + y;
float xc = x < whalf ? x : -width + x;
Vector2 vec_k = new Vector2(2.0f * Mathf.PI * xc / size.x, 2.0f * Mathf.PI * yc / size.z);
float sqrtMagnitude = (float)System.Math.Sqrt((vec_k.x * vec_k.x) + (vec_k.y * vec_k.y));
float iwkt = (float)System.Math.Sqrt(9.81f * sqrtMagnitude) * time * speed;
ComplexF coeffA = new ComplexF((float)System.Math.Cos(iwkt), (float)System.Math.Sin(iwkt));
ComplexF coeffB;
coeffB.Re = coeffA.Re;
coeffB.Im = -coeffA.Im;
int ny = y > 0 ? height - y : 0;
int nx = x > 0 ? width - x : 0;
data [idx] = h0 [idx] * coeffA + h0[width * ny + nx].GetConjugate() * coeffB;
t_x [idx] = data [idx] * new ComplexF(0.0f, vec_k.x) - data [idx] * vec_k.y;
// Choppy wave calculations
if (x + y > 0)
{
data [idx] += data [idx] * vec_k.x / sqrtMagnitude;
}
}
}
Fourier.FFT2(data, width, height, FourierDirection.Backward);
Fourier.FFT2(t_x, width, height, FourierDirection.Backward);
// Get base values for vertices and uv coordinates.
if (baseHeight == null)
{
baseHeight = baseMesh.vertices;
vertices = new Vector3[baseHeight.Length];
normals = new Vector3[baseHeight.Length];
tangents = new Vector4[baseHeight.Length];
}
int wh = width * height;
float scaleA = choppy_scale / wh;
float scaleB = scale / wh;
float scaleBinv = 1.0f / scaleB;
for (int i = 0; i < wh; i++)
{
int iw = i + i / width;
vertices [iw] = baseHeight [iw];
vertices [iw].x += data [i].Im * scaleA;
vertices [iw].y = data [i].Re * scaleB;
normals [iw] = Vector3.Normalize(new Vector3(t_x [i].Re, scaleBinv, t_x [i].Im));
if (((i + 1) % width) == 0)
{
int iwi = iw + 1;
int iwidth = i + 1 - width;
vertices [iwi] = baseHeight [iwi];
vertices [iwi].x += data [iwidth].Im * scaleA;
vertices [iwi].y = data [iwidth].Re * scaleB;
normals [iwi] = Vector3.Normalize(new Vector3(t_x [iwidth].Re, scaleBinv, t_x [iwidth].Im));
}
}
int offset = g_width * (g_height - 1);
for (int i = 0; i < g_width; i++)
{
int io = i + offset;
int mod = i % width;
vertices [io] = baseHeight [io];
vertices [io].x += data [mod].Im * scaleA;
vertices [io].y = data [mod].Re * scaleB;
normals [io] = Vector3.Normalize(new Vector3(t_x [mod].Re, scaleBinv, t_x [mod].Im));
}
int gwgh = g_width * g_height - 1;
for (int i = 0; i < gwgh; i++)
{
//Need to preserve w in refraction/reflection mode
if (!reflectionRefractionEnabled)
{
if (((i + 1) % g_width) == 0)
{
tangents [i] = Vector3.Normalize((vertices [i - width + 1] + new Vector3(size.x, 0.0f, 0.0f) - vertices [i]));
}
else
{
tangents [i] = Vector3.Normalize((vertices [i + 1] - vertices [i]));
}
tangents [i].w = 1.0f;
}
else
{
Vector3 tmp; // = Vector3.zero;
if (((i + 1) % g_width) == 0)
{
tmp = Vector3.Normalize(vertices[i - width + 1] + new Vector3(size.x, 0.0f, 0.0f) - vertices [i]);
}
else
{
tmp = Vector3.Normalize(vertices [i + 1] - vertices [i]);
}
tangents [i] = new Vector4(tmp.x, tmp.y, tmp.z, tangents [i].w);
}
}
//Vector3 playerRelPos = player.position - transform.position;
//In reflection mode, use tangent w for foam strength
if (reflectionRefractionEnabled)
{
for (int y = 0; y < g_height; y++)
{
for (int x = 0; x < g_width; x++)
{
int item = x + g_width * y;
if (x + 1 >= g_width)
{
tangents [item].w = tangents [g_width * y].w;
continue;
}
if (y + 1 >= g_height)
{
tangents [item].w = tangents [x].w;
continue;
}
float right = vertices[(x + 1) + g_width * y].x - vertices[item].x;
float foam = right / (size.x / g_width);
if (foam < 0.0f)
{
tangents [item].w = 1f;
}
else if (foam < 0.5f)
{
tangents [item].w += 3.0f * Time.deltaTime;
}
else
{
tangents [item].w -= 0.4f * Time.deltaTime;
}
if (player != null)
{
Vector3 player2Vertex = (player.position - vertices[item] - transform.position);
// foam around boat
if (player2Vertex.x >= size.x)
{
player2Vertex.x -= size.x;
}
if (player2Vertex.x <= -size.x)
{
player2Vertex.x += size.x;
}
if (player2Vertex.z >= size.z)
{
player2Vertex.z -= size.z;
}
if (player2Vertex.z <= -size.z)
{
player2Vertex.z += size.z;
}
player2Vertex.y = 0;
if (player2Vertex.sqrMagnitude < wakeDistance * wakeDistance)
{
tangents[item].w += 3.0f * Time.deltaTime;
}
}
tangents [item].w = Mathf.Clamp(tangents[item].w, 0.0f, 2.0f);
}
}
}
tangents [gwgh] = Vector4.Normalize(vertices [gwgh] + new Vector3(size.x, 0.0f, 0.0f) - vertices [1]);
for (int L0D = 0; L0D < max_LOD; L0D++)
{
int den = (int)System.Math.Pow(2f, L0D);
int itemcount = (int)((height / den + 1) * (width / den + 1));
Vector4[] tangentsLOD = new Vector4[itemcount];
Vector3[] verticesLOD = new Vector3[itemcount];
Vector3[] normalsLOD = new Vector3[itemcount];
int idx = 0;
for (int y = 0; y < g_height; y += den)
{
for (int x = 0; x < g_width; x += den)
{
int idx2 = g_width * y + x;
verticesLOD [idx] = vertices [idx2];
tangentsLOD [idx] = tangents [idx2];
normalsLOD [idx++] = normals [idx2];
}
}
for (int k = 0; k < tiles_LOD[L0D].Count; k++)
{
Mesh meshLOD = tiles_LOD [L0D][k];
meshLOD.vertices = verticesLOD;
meshLOD.normals = normalsLOD;
meshLOD.tangents = tangentsLOD;
}
}
}
/// <summary>
/// Multiply each element in lhs array with corresponding element in rhs array and
/// put product in result array
/// </summary>
/// <param name="lhs"></param>
/// <param name="rhs"></param>
/// <param name="result"></param>
static public void Multiply( ComplexF[] lhs, ComplexF[] rhs, ComplexF[] result ) {
Debug.Assert( lhs != null );
Debug.Assert( rhs != null );
Debug.Assert( result != null );
Debug.Assert( lhs.Length == rhs.Length );
Debug.Assert( lhs.Length == result.Length );
int length = lhs.Length;
for( int i = 0; i < length; i ++ ) {
result[i] = lhs[i] * rhs[i];
}
}
public float mag2db(ComplexF y)
{
return(20.0f * (float)Math.Log10(Math.Sqrt(y.Re * y.Re + y.Im * y.Im) / .02));
}
/// <summary>
/// Divide each element in lhs array with corresponding element in rhs array and
/// put product in result array
/// </summary>
/// <param name="lhs"></param>
/// <param name="rhs"></param>
/// <param name="result"></param>
static public void Divide( ComplexF[] lhs, ComplexF[] rhs, ComplexF[] result ) {
Debug.Assert( lhs != null );
Debug.Assert( rhs != null );
Debug.Assert( result != null );
Debug.Assert( lhs.Length == rhs.Length );
Debug.Assert( lhs.Length == result.Length );
ComplexF zero = ComplexF.Zero;
int length = lhs.Length;
for( int i = 0; i < length; i ++ ) {
if( rhs[i] != zero ) {
result[i] = lhs[i] / rhs[i];
}
else {
result[i] = zero;
}
}
}
static private void Swap( ref ComplexF a, ref ComplexF b ) {
ComplexF temp = a;
a = b;
b = temp;
}
/// <summary>
/// Scale and offset the elements in the array so that the
/// overall range is [0, 1]
/// </summary>
/// <param name="array"></param>
static public void Normalize( ComplexF[] array ) {
float min = 0, max = 0;
GetLengthRange( array, ref min, ref max );
Scale( array, ( 1 / ( max - min ) ) );
Offset( array, ( - min / ( max - min ) ) );
}
/// <summary>
/// Compute a 1D fast Fourier transform of a dataset of complex numbers.
/// </summary>
/// <param name="data"></param>
/// <param name="length"></param>
/// <param name="direction"></param>
public static void FFT_Quick( ComplexF[] data, int length, FourierDirection direction ) {
/*if( data == null ) {
throw new ArgumentNullException( "data" );
}
if( data.Length < length ) {
throw new ArgumentOutOfRangeException( "length", length, "must be at least as large as 'data.Length' parameter" );
}
if( Fourier.IsPowerOf2( length ) == false ) {
throw new ArgumentOutOfRangeException( "length", length, "must be a power of 2" );
}
Fourier.SyncLookupTableLength( length );*/
int ln = Fourier.Log2( length );
// reorder array
Fourier.ReorderArray( data );
// successive doubling
int N = 1;
int signIndex = ( direction == FourierDirection.Forward ) ? 0 : 1;
for( int level = 1; level <= ln; level ++ ) {
int M = N;
N <<= 1;
float[] uRLookup = _uRLookupF[ level, signIndex ];
float[] uILookup = _uILookupF[ level, signIndex ];
for( int j = 0; j < M; j ++ ) {
float uR = uRLookup[j];
float uI = uILookup[j];
for( int even = j; even < length; even += N ) {
int odd = even + M;
float r = data[ odd ].Re;
float i = data[ odd ].Im;
float odduR = r * uR - i * uI;
float odduI = r * uI + i * uR;
r = data[ even ].Re;
i = data[ even ].Im;
data[ even ].Re = r + odduR;
data[ even ].Im = i + odduI;
data[ odd ].Re = r - odduR;
data[ odd ].Im = i - odduI;
}
}
}
}
static private void LockWorkspaceF( int length, ref ComplexF[] workspace ) {
//Debug.Assert( _workspaceFLocked == false );
//_workspaceFLocked = true;
if( length >= _workspaceF.Length ) {
_workspaceF = new ComplexF[ length ];
}
workspace = _workspaceF;
}
/// <summary>
/// Compute a 1D fast Fourier transform of a dataset of complex numbers.
/// </summary>
/// <param name="data"></param>
/// <param name="direction"></param>
public static void FFT( ComplexF[] data, FourierDirection direction ) {
if( data == null ) {
throw new ArgumentNullException( "data" );
}
Fourier.FFT( data, data.Length, direction );
}
void Update()
{
//If player null, search for player by Player tag
if(player == null)
player = GameObject.FindGameObjectWithTag("Player").GetComponent<Transform>();
//Get sun reflection dir from sun object
if(sun != null){
SunDir = sun.transform.forward;
material.SetVector ("_SunDir", SunDir);
}
if (this.renderReflection)
RenderObject ();
if (followMainCamera) {
Vector3 centerOffset;
//centerOffset.x = Mathf.Floor (player.position.x / size.x) * size.x;
//centerOffset.z = Mathf.Floor (player.position.z / size.z) * size.z;
centerOffset.y = transform.position.y;
//centerOffset.x = (((int)player.position.x + 64) & ~127);
//centerOffset.z = (((int)player.position.z + 64) & ~127);
//Optimized ocean tiles movement
centerOffset.x = Mathf.Floor( (player.position.x + size.x * 0.5f) * sizeInv.x ) * size.x;
centerOffset.z = Mathf.Floor( (player.position.z + size.z * 0.5f) * sizeInv.y ) * size.z;
if(transform.position != centerOffset)
transform.position = centerOffset;
}
float hhalf=height/2f;
float whalf=width/2f;
float time=Time.time;
for (int y = 0; y<height; y++) {
for (int x = 0; x<width; x++) {
int idx = width * y + x;
float yc = y < hhalf ? y : -height + y;
float xc = x < whalf ? x : -width + x;
Vector2 vec_k = new Vector2 (2.0f * Mathf.PI * xc / size.x, 2.0f * Mathf.PI * yc / size.z);
float sqrtMagnitude=(float)System.Math.Sqrt((vec_k.x * vec_k.x) + (vec_k.y * vec_k.y));
float iwkt = (float)System.Math.Sqrt(9.81f * sqrtMagnitude) * time * speed;
ComplexF coeffA = new ComplexF ((float)System.Math.Cos(iwkt), (float)System.Math.Sin(iwkt));
ComplexF coeffB;
coeffB.Re = coeffA.Re;
coeffB.Im = -coeffA.Im;
int ny = y > 0 ? height - y : 0;
int nx = x > 0 ? width - x : 0;
data [idx] = h0 [idx] * coeffA + h0[width * ny + nx].GetConjugate() * coeffB;
t_x [idx] = data [idx] * new ComplexF (0.0f, vec_k.x) - data [idx] * vec_k.y;
// Choppy wave calculations
if (x + y > 0)
data [idx] += data [idx] * vec_k.x / sqrtMagnitude;
}
}
Fourier.FFT2 (data, width, height, FourierDirection.Backward);
Fourier.FFT2 (t_x, width, height, FourierDirection.Backward);
// Get base values for vertices and uv coordinates.
if (baseHeight == null) {
baseHeight = baseMesh.vertices;
vertices = new Vector3[baseHeight.Length];
normals = new Vector3[baseHeight.Length];
tangents = new Vector4[baseHeight.Length];
}
int wh=width*height;
float scaleA = choppy_scale / wh;
float scaleB = scale / wh;
float scaleBinv = 1.0f / scaleB;
for (int i=0; i<wh; i++) {
int iw = i + i / width;
vertices [iw] = baseHeight [iw];
vertices [iw].x += data [i].Im * scaleA;
vertices [iw].y = data [i].Re * scaleB;
normals [iw] = Vector3.Normalize(new Vector3 (t_x [i].Re, scaleBinv, t_x [i].Im));
if (((i + 1) % width)==0) {
int iwi=iw+1;
int iwidth=i+1-width;
vertices [iwi] = baseHeight [iwi];
vertices [iwi].x += data [iwidth].Im * scaleA;
vertices [iwi].y = data [iwidth].Re * scaleB;
normals [iwi] = Vector3.Normalize(new Vector3 (t_x [iwidth].Re, scaleBinv, t_x [iwidth].Im));
}
}
int offset = g_width * (g_height - 1);
for (int i=0; i<g_width; i++) {
int io=i+offset;
int mod=i % width;
vertices [io] = baseHeight [io];
vertices [io].x += data [mod].Im * scaleA;
vertices [io].y = data [mod].Re * scaleB;
normals [io] = Vector3.Normalize(new Vector3 (t_x [mod].Re, scaleBinv, t_x [mod].Im));
}
int gwgh=g_width*g_height-1;
for (int i=0; i<gwgh; i++) {
//Need to preserve w in refraction/reflection mode
if (!reflectionRefractionEnabled) {
if (((i + 1) % g_width) == 0) {
tangents [i] = Vector3.Normalize((vertices [i - width + 1] + new Vector3 (size.x, 0.0f, 0.0f) - vertices [i]));
} else {
tangents [i] = Vector3.Normalize((vertices [i + 1] - vertices [i]));
}
tangents [i].w = 1.0f;
} else {
Vector3 tmp;// = Vector3.zero;
if (((i + 1) % g_width) == 0) {
tmp = Vector3.Normalize(vertices[i - width + 1] + new Vector3 (size.x, 0.0f, 0.0f) - vertices [i]);
} else {
tmp = Vector3.Normalize(vertices [i + 1] - vertices [i]);
}
tangents [i] = new Vector4 (tmp.x, tmp.y, tmp.z, tangents [i].w);
}
}
//Vector3 playerRelPos = player.position - transform.position;
//In reflection mode, use tangent w for foam strength
if (reflectionRefractionEnabled) {
for (int y = 0; y < g_height; y++) {
for (int x = 0; x < g_width; x++) {
int item=x + g_width * y;
if (x + 1 >= g_width) {
tangents [item].w = tangents [g_width * y].w;
continue;
}
if (y + 1 >= g_height) {
tangents [item].w = tangents [x].w;
continue;
}
float right = vertices[(x + 1) + g_width * y].x - vertices[item].x;
float foam = right/(size.x / g_width);
if (foam < 0.0f)
tangents [item].w = 1f;
else if (foam < 0.5f)
tangents [item].w += 3.0f * Time.deltaTime;
else
tangents [item].w -= 0.4f * Time.deltaTime;
if (player != null )
{
Vector3 player2Vertex = (player.position - vertices[item] - transform.position);
// foam around boat
if (player2Vertex.x >= size.x)
player2Vertex.x -= size.x;
if (player2Vertex.x<= -size.x)
player2Vertex.x += size.x;
if (player2Vertex.z >= size.z)
player2Vertex.z -= size.z;
if (player2Vertex.z<= -size.z)
player2Vertex.z += size.z;
player2Vertex.y = 0;
if (player2Vertex.sqrMagnitude < wakeDistance * wakeDistance)
tangents[item].w += 3.0f * Time.deltaTime;
}
tangents [item].w = Mathf.Clamp (tangents[item].w, 0.0f, 2.0f);
}
}
}
tangents [gwgh] = Vector4.Normalize(vertices [gwgh] + new Vector3 (size.x, 0.0f, 0.0f) - vertices [1]);
for (int L0D=0; L0D<max_LOD; L0D++) {
int den = (int)System.Math.Pow (2f, L0D);
int itemcount = (int)((height / den + 1) * (width / den + 1));
Vector4[] tangentsLOD = new Vector4[itemcount];
Vector3[] verticesLOD = new Vector3[itemcount];
Vector3[] normalsLOD = new Vector3[itemcount];
int idx = 0;
for (int y=0; y<g_height; y+=den) {
for (int x=0; x<g_width; x+=den) {
int idx2 = g_width * y + x;
verticesLOD [idx] = vertices [idx2];
tangentsLOD [idx] = tangents [idx2];
normalsLOD [idx++] = normals [idx2];
}
}
for (int k=0; k< tiles_LOD[L0D].Count; k++) {
Mesh meshLOD = tiles_LOD [L0D][k];
meshLOD.vertices = verticesLOD;
meshLOD.normals = normalsLOD;
meshLOD.tangents = tangentsLOD;
}
}
}
/// <summary>
/// Update is called once per frame.
/// </summary>
private void Update()
{
if (!simulationEnabled)
{
return;
}
// Calculate mesh vertices, uv and tangents.
float halfWidth = tilePolygonWidth / 2.0f;
float halfHeight = tilePolygonHeight / 2.0f;
float time = Time.time;
for (int y = 0; y < tilePolygonHeight; ++y)
{
for (int x = 0; x < tilePolygonWidth; ++x)
{
int idx = tilePolygonWidth * y + x;
float yCopy = y < halfHeight ? y : y - tilePolygonHeight;
float xCopy = x < halfWidth ? x : x - tilePolygonWidth;
Vector2 vecK = new Vector2(2.0f * Mathf.PI * xCopy / oceanTileSize.x, 2.0f * Mathf.PI * yCopy / oceanTileSize.z);
float sqrtMagnitude = (float)Math.Sqrt(Mathf.Pow(vecK.x, 2.0f) + Mathf.Pow(vecK.y, 2.0f));
float offset = Mathf.Sqrt(GRAVITY_ACCELERATION * sqrtMagnitude) * time * waveSpeed;
ComplexF complexFA = new ComplexF(Mathf.Cos(offset), Mathf.Sin(offset));
ComplexF complexFB;
complexFB.Re = complexFA.Re;
complexFB.Im = -complexFA.Im;
int nY = y > 0 ? tilePolygonHeight - y : 0;
int nX = x > 0 ? tilePolygonWidth - x : 0;
waterHeightData[idx] = vertexSpectra[idx] * complexFA + vertexSpectra[tilePolygonWidth * nY + nX].GetConjugate() * complexFB;
tangentX[idx] = waterHeightData[idx] * new ComplexF(0.0f, vecK.x) - waterHeightData[idx] * vecK.y;
// Choppy wave calculation.
if (x + y > 0)
{
waterHeightData[idx] += waterHeightData[idx] * vecK.x / sqrtMagnitude;
}
}
}
Fourier.FFT2(waterHeightData, tilePolygonWidth, tilePolygonHeight, FourierDirection.Backward);
Fourier.FFT2(tangentX, tilePolygonWidth, tilePolygonHeight, FourierDirection.Backward);
// Get base values for vertices and uv coordinates.
if (baseHeights == null)
{
baseHeights = baseMesh.vertices;
vertices = new Vector3[baseHeights.Length];
normals = new Vector3[baseHeights.Length];
tangents = new Vector4[baseHeights.Length];
}
int area = tilePolygonWidth * tilePolygonHeight;
float scaleX = choppyScale / area;
float scaleY = waveScaleRealTime / area;
float scaleYReciprocal = MathUtility.GetReciprocal(scaleY);
for (int i = 0; i < area; ++i)
{
int index = i + i / tilePolygonWidth;
vertices[index] = baseHeights[index];
vertices[index].x += waterHeightData[i].Im * scaleX;
vertices[index].y = waterHeightData[i].Re * scaleY;
normals[index] = Vector3.Normalize(new Vector3(tangentX[i].Re, scaleYReciprocal, tangentX[i].Im));
if ((i + 1) % tilePolygonWidth == 0)
{
int indexPlus = index + 1;
int iWidth = i + 1 - tilePolygonWidth;
vertices[indexPlus] = baseHeights[indexPlus];
vertices[indexPlus].x += waterHeightData[iWidth].Im * scaleX;
vertices[indexPlus].y = waterHeightData[iWidth].Re * scaleY;
normals[indexPlus] = Vector3.Normalize(new Vector3(tangentX[iWidth].Re, scaleYReciprocal, tangentX[iWidth].Im));
}
}
int indexOffset = geometryWidth * (geometryHeight - 1);
for (int i = 0; i < geometryWidth; ++i)
{
int index = i + indexOffset;
int mod = i % tilePolygonWidth;
vertices[index] = baseHeights[index];
vertices[index].x += waterHeightData[mod].Im * scaleX;
vertices[index].y = waterHeightData[mod].Re * scaleY;
normals[index] = Vector3.Normalize(new Vector3(tangentX[mod].Re, scaleYReciprocal, tangentX[mod].Im));
}
int geometryArea = geometryWidth * geometryHeight - 1;
for (int i = 0; i < geometryArea; ++i)
{
Vector3 tmp;
if ((i + 1) % geometryWidth == 0)
{
tmp = Vector3.Normalize(vertices[i - tilePolygonWidth + 1] + new Vector3(oceanTileSize.x, 0.0f, 0.0f) - vertices[i]);
}
else
{
tmp = Vector3.Normalize(vertices[i + 1] - vertices[i]);
}
tangents[i] = new Vector4(tmp.x, tmp.y, tmp.z, tangents[i].w);
}
for (int y = 0; y < geometryHeight; ++y)
{
for (int x = 0; x < geometryWidth; ++x)
{
int index = x + geometryWidth * y;
if (x + 1 >= geometryWidth)
{
tangents[index].w = tangents[geometryWidth * y].w;
continue;
}
if (y + 1 >= geometryHeight)
{
tangents[index].w = tangents[x].w;
continue;
}
float right = vertices[x + 1 + geometryWidth * y].x - vertices[index].x;
float foam = right / (oceanTileSize.x / geometryWidth);
if (foam < 0.0f)
{
tangents[index].w = 1.0f;
}
else if (foam < 0.5f)
{
tangents[index].w += 3.0f * Time.deltaTime;
}
else
{
tangents[index].w -= 0.4f * Time.deltaTime;
}
tangents[index].w = Mathf.Clamp(tangents[index].w, 0.0f, 2.0f);
}
}
tangents[geometryArea] = Vector4.Normalize(vertices[geometryArea] + new Vector3(oceanTileSize.x, 0.0f, 0.0f) - vertices[1]);
for (int level = 0; level < MAX_LOD; ++level)
{
int pow = (int)Math.Pow(2.0f, level);
int length = (int)((tilePolygonHeight / pow + 1) * (tilePolygonWidth / pow + 1));
Vector4[] tangentsLOD = new Vector4[length];
Vector3[] verticesLOD = new Vector3[length];
Vector3[] normalsLOD = new Vector3[length];
int index = 0;
for (int y = 0; y < geometryHeight; y += pow)
{
for (int x = 0; x < geometryWidth; x += pow)
{
int indexTemp = geometryWidth * y + x;
verticesLOD[index] = vertices[indexTemp];
tangentsLOD[index] = tangents[indexTemp];
normalsLOD[index++] = normals[indexTemp];
}
}
for (int i = 0, count = tilesLOD[level].Count; i < count; ++i)
{
Mesh meshLOD = tilesLOD[level][i];
meshLOD.vertices = verticesLOD;
meshLOD.normals = normalsLOD;
meshLOD.tangents = tangentsLOD;
}
}
if (reflectionEnabled)
{
RenderReflectionAndRefraction();
}
}
