/// <summary>
/// Funciton to generate random noise for the effect.
/// </summary>
private void GenerateRandomNoise()
{
int textureSize = 128;
object parameter;
if ((Parameters.TryGetValue("TextureSize", out parameter)) &&
(parameter != null))
{
var size = (int)parameter;
if (size > 16)
{
textureSize = size;
}
}
using (var image = new GorgonImageData(new GorgonTexture2DSettings
{
Width = textureSize,
Height = textureSize,
Format = BufferFormat.R8_UIntNormal,
Usage = BufferUsage.Default
}))
{
unsafe
{
var dataPtr = (byte *)image.Buffers[0].Data.UnsafePointer;
// Write perlin noise to the texture.
for (int y = 0; y < textureSize; ++y)
{
for (int x = 0; x < textureSize; ++x)
{
float simplexNoise = GorgonRandom.SimplexNoise(new Vector2(x * (1.0f / _noiseFrequency), y * (1.0f / _noiseFrequency)));
if (simplexNoise < -0.75f)
{
simplexNoise *= -1;
}
else
{
simplexNoise *= 0.95f;
}
if (simplexNoise < 0.125f)
{
simplexNoise = 0.0f;
}
*(dataPtr++) = (byte)(simplexNoise * 255.0f);
}
}
}
_randomTexture = Graphics.Textures.CreateTexture <GorgonTexture2D>("Effect.OldFilm.RandomTexture", image);
}
}