public static float ValueCoherentNoise1D(float x, long seed, NoiseQuality quality)
{
int num = (!((double)x > 0.0)) ? ((int)x - 1) : ((int)x);
int x2 = num + 1;
float a = 0f;
switch (quality)
{
case NoiseQuality.Fast:
a = x - (float)num;
break;
case NoiseQuality.Standard:
a = Libnoise.SCurve3(x - (float)num);
break;
case NoiseQuality.Best:
a = Libnoise.SCurve5(x - (float)num);
break;
}
float n = ValueNoise1D(num, seed);
float n2 = ValueNoise1D(x2, seed);
return(Libnoise.Lerp(n, n2, a));
}
public float GetValue(float x, float y)
{
x *= _frequency;
y *= _frequency;
float num = _source2D.GetValue(x, y);
if (num < 0f)
{
num = 0f - num;
}
num = _offset - num;
num *= num;
float num2 = num;
float num3 = 1f;
int num4 = 1;
while ((double)num3 > 0.001 && (float)num4 < _octaveCount)
{
x *= _lacunarity;
y *= _lacunarity;
num3 = Libnoise.Clamp01(num * _gain);
num = _source2D.GetValue(x, y);
if ((double)num < 0.0)
{
num = 0f - num;
}
num = _offset - num;
num *= num;
num *= num3;
num2 += num * _spectralWeights[num4];
num4++;
}
return(num2);
}
/// <summary>
/// Generates an output value given the coordinates of the specified input value.
/// </summary>
/// <param name="x">The input coordinate on the x-axis.</param>
/// <param name="y">The input coordinate on the y-axis.</param>
/// <param name="z">The input coordinate on the z-axis.</param>
/// <returns>The resulting output value.</returns>
public double GetValue(double x, double y, double z)
{
double value = ((IModule3D)_sourceModule).GetValue(x, y, z);
value = (value + 1.0) / 2.0;
return(Math.Pow(Libnoise.FastFloor(value), _exponent) * 2.0 - 1.0);
}
public float GetValue(float x, float y)
{
int num = (!((double)x > 0.0)) ? ((int)x - 1) : ((int)x);
int num2 = (!((double)y > 0.0)) ? ((int)y - 1) : ((int)y);
int num3 = num & 0xFF;
int num4 = num2 & 0xFF;
x -= (float)num;
x -= (float)num2;
float a = 0f;
float a2 = 0f;
switch (_quality)
{
case NoiseQuality.Fast:
a = x;
a2 = y;
break;
case NoiseQuality.Standard:
a = Libnoise.SCurve3(x);
a2 = Libnoise.SCurve3(y);
break;
case NoiseQuality.Best:
a = Libnoise.SCurve5(x);
a2 = Libnoise.SCurve5(y);
break;
}
int num5 = _random[num3] + num4;
int num6 = _random[num3 + 1] + num4;
return(Libnoise.Lerp(Libnoise.Lerp(Grad(_random[num5], x, y), Grad(_random[num6], x - 1f, y), a), Libnoise.Lerp(Grad(_random[num5 + 1], x, y - 1f), Grad(_random[num6 + 1], x - 1f, y - 1f), a), a2));
}
/// <summary>
/// Returns the output value from the noise module given the
/// (latitude, longitude) coordinates of the specified input value
/// located on the surface of the sphere.
///
/// Use a negative latitude if the input value is located on the
/// southern hemisphere.
///
/// Use a negative longitude if the input value is located on the
/// western hemisphere.
/// </summary>
/// <param name="lat">The latitude of the input value, in degrees</param>
/// <param name="lon">The longitude of the input value, in degrees</param>
/// <returns>The output value from the noise module</returns>
public double GetValue(double lat, double lon)
{
double x = 0.0, y = 0.0, z = 0.0;
Libnoise.LatLonToXYZ(lat, lon, ref x, ref y, ref z);
return(((IModule3D)PSourceModule).GetValue(x, y, z));
}
public float GetValue(float x, float y, float z)
{
float value = ((IModule3D)_sourceModule).GetValue(x, y, z);
value = (value + 1f) / 2f;
return((float)Math.Pow((double)Libnoise.FastFloor(value), (double)_exponent) * 2f - 1f);
}
/// <summary>
/// Returns the output value from the noise module given the
/// (latitude, longitude) coordinates of the specified input value
/// located on the surface of the sphere.
///
/// Use a negative latitude if the input value is located on the
/// southern hemisphere.
///
/// Use a negative longitude if the input value is located on the
/// western hemisphere.
/// </summary>
/// <param name="lat">The latitude of the input value, in degrees</param>
/// <param name="lon">The longitude of the input value, in degrees</param>
/// <returns>The output value from the noise module</returns>
public float GetValue(float lat, float lon)
{
float x = 0.0f, y = 0.0f, z = 0.0f;
Libnoise.LatLonToXYZ(lat, lon, ref x, ref y, ref z);
return(((IModule3D)PSourceModule).GetValue(x, y, z));
}
/// <summary>
/// Generates an output value given the coordinates of the specified input value.
/// </summary>
/// <param name="x">The input coordinate on the x-axis.</param>
/// <param name="y">The input coordinate on the y-axis.</param>
/// <param name="z">The input coordinate on the z-axis.</param>
/// <returns>The resulting output value.</returns>
public float GetValue(float x, float y, float z)
{
float value = ((IModule3D)_sourceModule).GetValue(x, y, z);
value = (value + 1.0f) / 2.0f;
return((float)Math.Pow(Libnoise.FastFloor(value), _exponent) * 2.0f - 1.0f);
}
public float GetValue(float x, float y, float z)
{
float value = ((IModule3D)_sourceModule).GetValue(x, y, z);
int i;
for (i = 0; i < _controlPoints.Count && !(value < _controlPoints[i]); i++)
{
}
int num = Libnoise.Clamp(i - 1, 0, _controlPoints.Count - 1);
int num2 = Libnoise.Clamp(i, 0, _controlPoints.Count - 1);
if (num == num2)
{
return(_controlPoints[num2]);
}
float a = _controlPoints[num];
float b = _controlPoints[num2];
float num3 = (value - a) / (b - a);
if (_invert)
{
num3 = 1f - num3;
Libnoise.SwapValues(ref a, ref b);
}
num3 *= num3;
return(Libnoise.Lerp(a, b, num3));
}
/// <summary>
/// Generates an output value given the coordinates of the specified input value.
/// </summary>
/// <param name="x">The input coordinate on the x-axis.</param>
/// <param name="y">The input coordinate on the y-axis.</param>
/// <returns>The resulting output value.</returns>
public float GetValue(float x, float y)
{
int curOctave;
x *= _frequency;
y *= _frequency;
// Initialize value : 1st octave
float signal = _source2D.GetValue(x, y);
// get absolute value of signal (this creates the ridges)
if (signal < 0.0f)
{
signal = -signal;
}
// invert and translate (note that "offset" should be ~= 1.0)
signal = _offset - signal;
// Square the signal to increase the sharpness of the ridges.
signal *= signal;
// Add the signal to the output value.
float value = signal;
float weight = 1.0f;
for (curOctave = 1; weight > 0.001 && curOctave < _octaveCount; curOctave++)
{
x *= _lacunarity;
y *= _lacunarity;
// Weight successive contributions by the previous signal.
weight = Libnoise.Clamp01(signal * _gain);
// Get the coherent-noise value.
signal = _source2D.GetValue(x, y);
// Make the ridges.
if (signal < 0.0)
{
signal = -signal;
}
signal = _offset - signal;
// Square the signal to increase the sharpness of the ridges.
signal *= signal;
// The weighting from the previous octave is applied to the signal.
// Larger values have higher weights, producing sharp points along the
// ridges.
signal *= weight;
// Add the signal to the output value.
value += (signal * _spectralWeights[curOctave]);
}
return(value);
}
} //end GetValue
#endregion
#region ValueNoise1D
/// <summary>
/// Generates a value-coherent-noise value from the coordinates of a
/// one-dimensional input value.
///
/// The return value ranges from -1.0 to +1.0.
///
/// </summary>
/// <param name="x">The x coordinate of the input value</param>
/// <param name="seed">The random number seed</param>
/// <param name="quality">The quality of the coherent-noise</param>
/// <returns>The generated value-coherent-noise value</returns>
public static float ValueCoherentNoise1D(float x, long seed, NoiseQuality quality)
{
// Create a unit-length line aligned along an integer boundary.
// This line surrounds the input point.
int x0 = (x > 0.0 ? (int)x: (int)x - 1);
int x1 = x0 + 1;
float xs = 0;
switch (quality)
{
case NoiseQuality.Fast:
xs = (x - (float)x0);
break;
case NoiseQuality.Standard:
xs = Libnoise.SCurve3(x - (float)x0);
break;
case NoiseQuality.Best:
xs = Libnoise.SCurve5(x - (float)x0);
break;
} //end switch
// Now calculate the noise values at each point of the line. To generate
// the coherent-noise value at the input point, interpolate these two
// noise values using the S-curve value as the interpolant (trilinear
// interpolation.)
float n0, n1;
n0 = ValueNoise1D(x0, seed);
n1 = ValueNoise1D(x1, seed);
return(Libnoise.Lerp(n0, n1, xs));
} //end ValueCoherentNoise1D
private void Randomize(int seed)
{
_random = new int[RandomSize * 2];
if (seed != 0)
{
// Shuffle the array using the given seed
// Unpack the seed into 4 bytes then perform a bitwise XOR operation
// with each byte
var f = new byte[4];
Libnoise.UnpackLittleUint32(seed, ref f);
for (int i = 0; i < Source.Length; i++)
{
_random[i] = Source[i] ^ f[0];
_random[i] ^= f[1];
_random[i] ^= f[2];
_random[i] ^= f[3];
_random[i + RandomSize] = _random[i];
}
}
else
{
for (int i = 0; i < RandomSize; i++)
{
_random[i + RandomSize] = _random[i] = Source[i];
}
}
}
} //end Render
#endregion
#region Internal
/// <summary>
/// Calculates the normal vector at a given point on the noise map.
///
/// This method encodes the (x, y, z) components of the normal vector
/// into the (red, green, blue) channels of the returned color. In
/// order to represent the vector as a color, each coordinate of the
/// normal is mapped from the -1.0 to 1.0 range to the 0 to 255 range.
///
/// The bump height specifies the ratio of spatial resolution to
/// elevation resolution. For example, if your noise map has a
/// spatial resolution of 30 meters and an elevation resolution of one
/// meter, set the bump height to 1.0 / 30.0.
///
/// The spatial resolution and elevation resolution are determined by
/// the application.
/// </summary>
/// <param name="nc">The height of the given point in the noise map</param>
/// <param name="nr">The height of the left neighbor</param>
/// <param name="nu">The height of the up neighbor</param>
/// <param name="bumpHeight">The bump height</param>
/// <returns>The normal vector represented as a color</returns>
IColor CalcNormalColor(float nc, float nr, float nu, float bumpHeight)
{
// Calculate the surface normal.
nc *= bumpHeight;
nr *= bumpHeight;
nu *= bumpHeight;
float ncr = (nc - nr);
float ncu = (nc - nu);
float d = (float)Math.Sqrt((ncu * ncu) + (ncr * ncr) + 1);
float vxc = (nc - nr) / d;
float vyc = (nc - nu) / d;
float vzc = 1.0f / d;
// Map the normal range from the (-1.0 .. +1.0) range to the (0 .. 255)
// range.
byte xc, yc, zc;
xc = (byte)(Libnoise.FastFloor((vxc + 1.0f) * 127.5f) & 0xff);
yc = (byte)(Libnoise.FastFloor((vyc + 1.0f) * 127.5f) & 0xff);
zc = (byte)(Libnoise.FastFloor((vzc + 1.0f) * 127.5f) & 0xff);
//
//zc = (byte)((int)((floor)((vzc + 1.0f) * 127.5f)) & 0xff);
return(new Color(xc, yc, zc, 255));
} //end CalcNormalColor
/// <summary>
/// Calculates the normal vector at a given point on the noise map.
///
/// This method encodes the (x, y, z) components of the normal vector
/// into the (red, green, blue) channels of the returned color. In
/// order to represent the vector as a color, each coordinate of the
/// normal is mapped from the -1.0 to 1.0 range to the 0 to 255 range.
///
/// The bump height specifies the ratio of spatial resolution to
/// elevation resolution. For example, if your noise map has a
/// spatial resolution of 30 meters and an elevation resolution of one
/// meter, set the bump height to 1.0 / 30.0.
///
/// The spatial resolution and elevation resolution are determined by
/// the application.
/// </summary>
/// <param name="nc">The height of the given point in the noise map</param>
/// <param name="nr">The height of the left neighbor</param>
/// <param name="nu">The height of the up neighbor</param>
/// <param name="bumpHeight">The bump height</param>
/// <returns>The normal vector represented as a color</returns>
private IColor CalcNormalColor(double nc, double nr, double nu, double bumpHeight)
{
// Calculate the surface normal.
nc *= bumpHeight;
nr *= bumpHeight;
nu *= bumpHeight;
double ncr = (nc - nr);
double ncu = (nc - nu);
var d = Math.Sqrt((ncu * ncu) + (ncr * ncr) + 1);
double vxc = (nc - nr) / d;
double vyc = (nc - nu) / d;
double vzc = 1.0 / d;
// Map the normal range from the (-1.0 .. +1.0) range to the (0 .. 255)
// range.
byte xc, yc, zc;
xc = (byte)(Libnoise.FastFloor((vxc + 1.0) * 127.5) & 0xff);
yc = (byte)(Libnoise.FastFloor((vyc + 1.0) * 127.5) & 0xff);
zc = (byte)(Libnoise.FastFloor((vzc + 1.0) * 127.5) & 0xff);
//
//zc = (byte)((int)((floor)((vzc + 1.0) * 127.5)) & 0xff);
return(new Color(xc, yc, zc, 255));
}
public IColor GetColor(float position)
{
int i;
for (i = 0; i < _gradientPoints.Count; i++)
{
GradientPoint gradientPoint = _gradientPoints[i];
if (position < gradientPoint.Position)
{
break;
}
}
int num = Libnoise.Clamp(i - 1, 0, _gradientPoints.Count - 1);
int num2 = Libnoise.Clamp(i, 0, _gradientPoints.Count - 1);
if (num == num2)
{
GradientPoint gradientPoint2 = _gradientPoints[num2];
return(gradientPoint2.Color);
}
GradientPoint gradientPoint3 = _gradientPoints[num];
float position2 = gradientPoint3.Position;
GradientPoint gradientPoint4 = _gradientPoints[num2];
float position3 = gradientPoint4.Position;
float num3 = (position - position2) / (position3 - position2);
GradientPoint gradientPoint5 = _gradientPoints[num];
IColor color = gradientPoint5.Color;
GradientPoint gradientPoint6 = _gradientPoints[num2];
return(Color.Lerp(color, gradientPoint6.Color, num3));
}
/// <summary>
/// Generates an output value given the coordinates of the specified input value.
/// </summary>
/// <param name="x">The input coordinate on the x-axis.</param>
/// <returns>The resulting output value.</returns>
public float GetValue(float x)
{
// Fast floor
var xf = x > 0.0 ? (int)x : (int)x - 1;
// Compute the cell coordinates
var cellX = xf & 255;
// Retrieve the decimal part of the cell
x -= xf;
// Smooth the curve
var u = 0.0f;
switch (Quality)
{
case NoiseQuality.Fast:
u = x;
break;
case NoiseQuality.Standard:
u = Libnoise.SCurve3(x);
break;
case NoiseQuality.Best:
u = Libnoise.SCurve5(x);
break;
}
return(Libnoise.Lerp(Grad(_random[cellX], x), Grad(_random[cellX + 1], x - 1), u));
}
/// <summary>
/// Generates an output value given the coordinates of the specified input value.
/// </summary>
/// <param name="x">The input coordinate on the x-axis.</param>
/// <returns>The resulting output value.</returns>
public double GetValue(double x)
{
// Fast floor
int xf = (x > 0.0) ? (int)x : (int)x - 1;
// Compute the cell coordinates
int X = xf & 255;
// Retrieve the decimal part of the cell
x -= xf;
// Smooth the curve
double u = 0.0;
switch (Quality)
{
case NoiseQuality.Fast:
u = x;
break;
case NoiseQuality.Standard:
u = Libnoise.SCurve3(x);
break;
case NoiseQuality.Best:
u = Libnoise.SCurve5(x);
break;
}
return(Libnoise.Lerp(Grad(_random[X], x), Grad(_random[X + 1], x - 1), u));
}
private IColor CalcDestColor(IColor sourceColor, IColor backgroundColor, float lightValue)
{
float n = (float)(int)sourceColor.Red / 255f;
float n2 = (float)(int)sourceColor.Green / 255f;
float n3 = (float)(int)sourceColor.Blue / 255f;
float a = (float)(int)sourceColor.Alpha / 255f;
float n4 = (float)(int)backgroundColor.Red / 255f;
float n5 = (float)(int)backgroundColor.Green / 255f;
float n6 = (float)(int)backgroundColor.Blue / 255f;
float num = Libnoise.Lerp(n4, n, a);
float num2 = Libnoise.Lerp(n5, n2, a);
float num3 = Libnoise.Lerp(n6, n3, a);
if (_lightEnabled)
{
float num4 = lightValue * (float)(int)_lightColor.Red / 255f;
float num5 = lightValue * (float)(int)_lightColor.Green / 255f;
float num6 = lightValue * (float)(int)_lightColor.Blue / 255f;
num *= num4;
num2 *= num5;
num3 *= num6;
}
num = Libnoise.Clamp01(num);
num2 = Libnoise.Clamp01(num2);
num3 = Libnoise.Clamp01(num3);
return(new Color((byte)((uint)(num * 255f) & 0xFF), (byte)((uint)(num2 * 255f) & 0xFF), (byte)((uint)(num3 * 255f) & 0xFF), Math.Max(sourceColor.Alpha, backgroundColor.Alpha)));
}
/// <summary>
/// Generates an output value given the coordinates of the specified input value.
/// </summary>
/// <param name="x">The input coordinate on the x-axis.</param>
/// <param name="y">The input coordinate on the y-axis.</param>
/// <param name="z">The input coordinate on the z-axis.</param>
/// <returns>The resulting output value.</returns>
public double GetValue(double x, double y, double z)
{
double v0 = ((IModule3D)_leftModule).GetValue(x, y, z);
double v1 = ((IModule3D)_rightModule).GetValue(x, y, z);
double alpha = (((IModule3D)_controlModule).GetValue(x, y, z) + 1.0) / 2.0;
return(Libnoise.Lerp(v0, v1, alpha));
}
public float GetValue(float x, float y, float z)
{
float value = ((IModule3D)_leftModule).GetValue(x, y, z);
float value2 = ((IModule3D)_rightModule).GetValue(x, y, z);
float a = (((IModule3D)_controlModule).GetValue(x, y, z) + 1f) / 2f;
return(Libnoise.Lerp(value, value2, a));
}
} //end Blend
#endregion
#region IModule3D Members
/// <summary>
/// Generates an output value given the coordinates of the specified input value.
/// </summary>
/// <param name="x">The input coordinate on the x-axis.</param>
/// <param name="y">The input coordinate on the y-axis.</param>
/// <param name="z">The input coordinate on the z-axis.</param>
/// <returns>The resulting output value.</returns>
public float GetValue(float x, float y, float z)
{
float v0 = ((IModule3D)_leftModule).GetValue(x, y, z);
float v1 = ((IModule3D)_rightModule).GetValue(x, y, z);
float alpha = (((IModule3D)_controlModule).GetValue(x, y, z) + 1.0f) / 2.0f;
return(Libnoise.Lerp(v0, v1, alpha));
} //end GetValue
public override void WriteFile()
{
if (_image == null)
{
throw new ArgumentException("An image map must be provided");
}
int width = _image.Width;
int height = _image.Height;
int num = CalcWidthByteCount(width);
int num2 = num * height;
byte[] array = new byte[num];
OpenFile();
byte[] buffer = new byte[4];
byte[] buffer2 = new byte[2]
{
66,
77
};
try
{
_writer.Write(buffer2);
_writer.Write(Libnoise.UnpackLittleUint32(num2 + 54, ref buffer));
_writer.Write(Libnoise.UnpackLittleUint32(0, ref buffer));
_writer.Write(Libnoise.UnpackLittleUint32(54, ref buffer));
_writer.Write(Libnoise.UnpackLittleUint32(40, ref buffer));
_writer.Write(Libnoise.UnpackLittleUint32(width, ref buffer));
_writer.Write(Libnoise.UnpackLittleUint32(height, ref buffer));
_writer.Write(Libnoise.UnpackLittleUint16(1, ref buffer2));
_writer.Write(Libnoise.UnpackLittleUint16(24, ref buffer2));
_writer.Write(Libnoise.UnpackLittleUint32(0, ref buffer));
_writer.Write(Libnoise.UnpackLittleUint32(num2, ref buffer));
_writer.Write(Libnoise.UnpackLittleUint32(2834, ref buffer));
_writer.Write(Libnoise.UnpackLittleUint32(2834, ref buffer));
_writer.Write(Libnoise.UnpackLittleUint32(0, ref buffer));
_writer.Write(buffer);
for (int i = 0; i < height; i++)
{
int num3 = 0;
Array.Clear(array, 0, array.Length);
for (int j = 0; j < width; j++)
{
Color value = _image.GetValue(j, i);
array[num3++] = value.Blue;
array[num3++] = value.Green;
array[num3++] = value.Red;
}
_writer.Write(array);
}
}
catch (Exception innerException)
{
throw new IOException("Unknown IO exception", innerException);
}
CloseFile();
}
public new float GetValue(float x, float y)
{
float num = 0f;
float num2 = 0f;
float num3 = 0f;
float num4 = (x + y) * F2;
int num5 = Libnoise.FastFloor(x + num4);
int num6 = Libnoise.FastFloor(y + num4);
float num7 = (float)(num5 + num6) * G2;
float num8 = x - ((float)num5 - num7);
float num9 = y - ((float)num6 - num7);
int num10;
int num11;
if (num8 > num9)
{
num10 = 1;
num11 = 0;
}
else
{
num10 = 0;
num11 = 1;
}
float num12 = num8 - (float)num10 + G2;
float num13 = num9 - (float)num11 + G2;
float num14 = num8 + G22;
float num15 = num9 + G22;
int num16 = num5 & 0xFF;
int num17 = num6 & 0xFF;
float num18 = 0.5f - num8 * num8 - num9 * num9;
if (num18 > 0f)
{
num18 *= num18;
int num19 = _random[num16 + _random[num17]] % 12;
num = num18 * num18 * Dot(_grad3[num19], num8, num9);
}
float num20 = 0.5f - num12 * num12 - num13 * num13;
if (num20 > 0f)
{
num20 *= num20;
int num21 = _random[num16 + num10 + _random[num17 + num11]] % 12;
num2 = num20 * num20 * Dot(_grad3[num21], num12, num13);
}
float num22 = 0.5f - num14 * num14 - num15 * num15;
if (num22 > 0f)
{
num22 *= num22;
int num23 = _random[num16 + 1 + _random[num17 + 1]] % 12;
num3 = num22 * num22 * Dot(_grad3[num23], num14, num15);
}
return(70f * (num + num2 + num3));
}
public static IColor Lerp(IColor color0, IColor color1, float t, bool withAlphaChannel)
{
IColor color2 = (IColor)Activator.CreateInstance(color0.GetType());
color2.Red = Libnoise.Lerp(color0.Red, color1.Red, t);
color2.Green = Libnoise.Lerp(color0.Green, color1.Green, t);
color2.Blue = Libnoise.Lerp(color0.Blue, color1.Blue, t);
color2.Alpha = (byte)((!withAlphaChannel) ? 255 : Libnoise.Lerp(color0.Alpha, color1.Alpha, t));
return(color2);
}
} //end ImprovedPerlin
#endregion
#region Utils
/// <summary>
/// Initializes the random values
///
/// </summary>
/// <param name="seed">The seed used to generate the random values</param>
protected void Randomize(int seed)
{
_random = new int[RANDOM_SIZE * 2];
if (seed != 0)
{
// Shuffle the array using the given seed
// Unpack the seed into 4 bytes then perform a bitwise XOR operation
// with each byte
byte[] F = new byte[4];
Libnoise.UnpackLittleUint32(seed, ref F);
for (int i = 0; i < _source.Length; i++)
{
/*
* _random[i] = (F[0] > 0) ? _source[i] ^ F[0] : _source[i];
* _random[i] = (F[1] > 0) ? _source[i] ^ F[1] : _random[i];
* _random[i] = (F[2] > 0) ? _source[i] ^ F[2] : _random[i];
* _random[i] = (F[3] > 0) ? _source[i] ^ F[3] : _random[i];
*/
_random[i] = _source[i] ^ F[0];
_random[i] ^= F[1];
_random[i] ^= F[2];
_random[i] ^= F[3];
_random[i + RANDOM_SIZE] = _random[i];
} //end for
#if NOISE_RANDOM_PARANOIA
#warning NOISE_RANDOM_PARANOIA is on
// Test if _random has unique values, a sorted _random array
// must have values from 0 to 255
int[] __sorted = new int[RANDOM_SIZE];
Array.Copy(_random, __sorted, RANDOM_SIZE);
Array.Sort(__sorted);
for (int _j = 0; _j < RANDOM_SIZE; _j++)
{
if (_j != __sorted[_j])
{
throw new Exception("Unconsistent random value at " + _j + " : " + __sorted[_j]);
} //end if
} //end for
#endif
} //end if
else
{
for (int i = 0; i < RANDOM_SIZE; i++)
{
_random[i + RANDOM_SIZE] = _random[i] = _source[i];
} //end for
} //end else
} //end Randomize
/// <summary>
/// Initializes the random values
///
/// </summary>
/// <param name="seed">The seed used to generate the random values</param>
private void Randomize(int seed)
{
_random = new int[RandomSize * 2];
if (seed != 0)
{
// Shuffle the array using the given seed
// Unpack the seed into 4 bytes then perform a bitwise XOR operation
// with each byte
var F = new byte[4];
Libnoise.UnpackLittleUint32(seed, ref F);
for (int i = 0; i < Source.Length; i++)
{
/*
* _random[i] = (F[0] > 0) ? _source[i] ^ F[0] : _source[i];
* _random[i] = (F[1] > 0) ? _source[i] ^ F[1] : _random[i];
* _random[i] = (F[2] > 0) ? _source[i] ^ F[2] : _random[i];
* _random[i] = (F[3] > 0) ? _source[i] ^ F[3] : _random[i];
*/
_random[i] = Source[i] ^ F[0];
_random[i] ^= F[1];
_random[i] ^= F[2];
_random[i] ^= F[3];
_random[i + RandomSize] = _random[i];
}
#if NOISE_RANDOM_PARANOIA
#warning NOISE_RANDOM_PARANOIA is on
// Test if Random has unique values, a sorted Random array
// must have values from 0 to 255
var __sorted = new int[RandomSize];
Array.Copy(Random, __sorted, RandomSize);
Array.Sort(__sorted);
for (int _j = 0; _j < RandomSize; _j++)
{
if (_j != __sorted[_j])
{
throw new Exception("Unconsistent random value at " + _j + " : " + __sorted[_j]);
}
}
#endif
}
else
{
for (int i = 0; i < RandomSize; i++)
{
_random[i + RandomSize] = _random[i] = Source[i];
}
}
}
} //end Grad
#endregion
#region IModule2D Members
/// <summary>
/// Generates an output value given the coordinates of the specified input value.
/// </summary>
/// <param name="x">The input coordinate on the x-axis.</param>
/// <param name="y">The input coordinate on the y-axis.</param>
/// <returns>The resulting output value.</returns>
public float GetValue(float x, float y)
{
// Fast floor
int xf = (x > 0.0) ? (int)x: (int)x - 1;
int yf = (y > 0.0) ? (int)y: (int)y - 1;
// Compute the cell coordinates
int X = xf & 255;
int Y = yf & 255;
// Retrieve the decimal part of the cell
x -= (float)xf;
x -= (float)yf;
// Smooth the curve
float u = 0.0f, v = 0.0f;
switch (_quality)
{
case NoiseQuality.Fast:
u = x;
v = y;
break;
case NoiseQuality.Standard:
u = Libnoise.SCurve3(x);
v = Libnoise.SCurve3(y);
break;
case NoiseQuality.Best:
u = Libnoise.SCurve5(x);
v = Libnoise.SCurve5(y);
break;
} //end switch
// Fetch some randoms values from the table
int A = _random[X] + Y;
int B = _random[X + 1] + Y;
// Interpolate between directions
return(Libnoise.Lerp(
Libnoise.Lerp(
Grad(_random[A], x, y),
Grad(_random[B], x - 1, y),
u
),
Libnoise.Lerp(
Grad(_random[A + 1], x, y - 1),
Grad(_random[B + 1], x - 1, y - 1),
u
),
v
));
} //end GetValue
/// <summary>
/// Generates an output value given the coordinates of the specified input value.
/// </summary>
/// <param name="x">The input coordinate on the x-axis.</param>
/// <param name="y">The input coordinate on the y-axis.</param>
/// <returns>The resulting output value.</returns>
public float GetValue(float x, float y)
{
// Fast floor
var xf = x > 0.0 ? (int)x : (int)x - 1;
var yf = y > 0.0 ? (int)y : (int)y - 1;
// Compute the cell coordinates
var cellX = xf & 255;
var cellY = yf & 255;
// Retrieve the decimal part of the cell
x -= xf;
x -= yf;
// Smooth the curve
float u = 0.0f, v = 0.0f;
switch (Quality)
{
case NoiseQuality.Fast:
u = x;
v = y;
break;
case NoiseQuality.Standard:
u = Libnoise.SCurve3(x);
v = Libnoise.SCurve3(y);
break;
case NoiseQuality.Best:
u = Libnoise.SCurve5(x);
v = Libnoise.SCurve5(y);
break;
}
// Fetch some randoms values from the table
var cellA = _random[cellX] + cellY;
var cellB = _random[cellX + 1] + cellY;
// Interpolate between directions
return(Libnoise.Lerp(
Libnoise.Lerp(
Grad(_random[cellA], x, y),
Grad(_random[cellB], x - 1, y),
u
),
Libnoise.Lerp(
Grad(_random[cellA + 1], x, y - 1),
Grad(_random[cellB + 1], x - 1, y - 1),
u
),
v
));
}
/// <summary>
/// Performs linear interpolation between two colors only with rgb channels.
/// </summary>
/// <param name="color0">The first color.</param>
/// <param name="color1">The second color.</param>
/// <param name="t">the amount to interpolate between the two colors.</param>
/// <param name="withAlphaChannel">Flag indicates if this method also interpolate alpha channel.</param>
/// <returns>The interpolated color, with the same type of color0.</returns>
public static IColor Lerp(IColor color0, IColor color1, double t, bool withAlphaChannel = true)
{
var color = (IColor)Activator.CreateInstance(color0.GetType());
color.Red = Libnoise.Lerp(color0.Red, color1.Red, t);
color.Green = Libnoise.Lerp(color0.Green, color1.Green, t);
color.Blue = Libnoise.Lerp(color0.Blue, color1.Blue, t);
color.Alpha = (withAlphaChannel) ? Libnoise.Lerp(color0.Alpha, color1.Alpha, t) : (byte)255;
return(color);
}
} //end Equals
#endregion
#region Utilities
/// <summary>
/// Performs linear interpolation between two colors only with rgb channels
/// </summary>
/// <param name="color0">The first color</param>
/// <param name="color1">The second color</param>
/// <param name="t">the amount to interpolate between the two colors</param>
/// <param name="withAlphaChannel">Flag indicates if this method also interpolate alpha channel</param>
/// <returns>The interpolated color, with the same type of color0</returns>
public static IColor Lerp(IColor color0, IColor color1, float t, bool withAlphaChannel)
{
IColor color = (IColor)System.Activator.CreateInstance(color0.GetType());
color.Red = Libnoise.Lerp(color0.Red, color1.Red, t);
color.Green = Libnoise.Lerp(color0.Green, color1.Green, t);
color.Blue = Libnoise.Lerp(color0.Blue, color1.Blue, t);
color.Alpha = (withAlphaChannel) ? Libnoise.Lerp(color0.Alpha, color1.Alpha, t) : (byte)255;
return(color);
} //end Lerp