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Add To/From XYZ methods to Color4.

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Fraser Waters 2014-11-10 01:37:37 +01:00
parent 072263f29d
commit 679419bb67
1 changed files with 40 additions and 0 deletions
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Source/OpenTK/Graphics/Color4.cs
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@ -1238,6 +1238,46 @@ namespace OpenTK.Graphics
#endregion
#region XYZ
/// <summary>
/// Converts XYZ color values to RGB color values.
/// </summary>
/// <returns>
/// Returns the converted color value.
/// </returns>
/// <param name="xyz">
/// Color value to convert with the trisimulus values of X, Y, and Z in the corresponding element, and the W element with Alpha (which is copied to the output's Alpha value).
/// Each has a range of 0.0 to 1.0.
/// </param>
/// <remarks>Uses the CIE XYZ colorspace.</remarks>
public static Color4 FromXyz(Vector4 xyz)
{
var r = 0.41847f * xyz.X + -0.15866f * xyz.Y + -0.082835f * xyz.Z;
var g = -0.091169f * xyz.X + 0.25243f * xyz.Y + 0.015708f * xyz.Z;
var b = 0.00092090f * xyz.X + -0.0025498f * xyz.Y + 0.17860f * xyz.Z;
return new Color4(r, g, b, xyz.W);
}
/// <summary>
/// Converts RGB color values to XYZ color values.
/// </summary>
/// <returns>
/// Returns the converted color value with the trisimulus values of X, Y, and Z in the corresponding element, and the W element with Alpha (a copy of the input's Alpha value).
/// Each has a range of 0.0 to 1.0.
/// </returns>
/// <param name="rgb">Color value to convert.</param>
/// <remarks>Uses the CIE XYZ colorspace.</remarks>
public static Vector4 ToXyz(Color4 rgb)
{
var x = (0.49f * rgb.R + 0.31f * rgb.G + 0.20f * rgb.B) / 0.17697f;
var y = (0.17697f * rgb.R + 0.81240f * rgb.G + 0.01063f * rgb.B) / 0.17697f;
var z = (0.00f * rgb.R + 0.01f * rgb.G + 0.99f * rgb.B) / 0.17697f;
return new Vector4(x, y, z, rgb.A);
}
#endregion
#endregion
#region IEquatable<Color4> Members