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using System.Diagnostics;
namespace LibNoise.Operator
{
/// <summary>
/// Provides a noise module that caches the last output value generated by a source
/// module. [OPERATOR]
/// </summary>
public class Cache : ModuleBase
{
#region Fields
private double _value;
private bool _cached;
private double _x;
private double _y;
private double _z;
#endregion
#region Constructors
/// <summary>
/// Initializes a new instance of Cache.
/// </summary>
public Cache()
: base(1)
{
}
/// <summary>
/// Initializes a new instance of Cache.
/// </summary>
/// <param name="input">The input module.</param>
public Cache(ModuleBase input)
: base(1)
{
Modules[0] = input;
}
#endregion
#region ModuleBase Members
/// <summary>
/// Gets or sets a source module by index.
/// </summary>
/// <param name="index">The index of the source module to aquire.</param>
/// <returns>The requested source module.</returns>
public override ModuleBase this[int index]
{
get { return base[index]; }
set
{
base[index] = value;
_cached = false;
}
}
/// <summary>
/// Returns the output value for the given input coordinates.
/// </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 override double GetValue(double x, double y, double z)
{
Debug.Assert(Modules[0] != null);
if (!(_cached && _x == x && _y == y && _z == z))
{
_value = Modules[0].GetValue(x, y, z);
_x = x;
_y = y;
_z = z;
}
_cached = true;
return _value;
}
#endregion
}
}
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