/// <summary>
/// Initializes a new instance of the <see cref="LuminanceEffect" /> class.
/// </summary>
/// <param name="context">The context.</param>
/// <param name="luminanceFormat">The luminance format.</param>
/// <param name="luminanceLogEffect">The luminance log effect.</param>
/// <exception cref="System.ArgumentNullException">lunkinanceLogShader</exception>
public LuminanceEffect(ImageEffectContext context, PixelFormat luminanceFormat = PixelFormat.R16_Float, ImageEffectShader luminanceLogEffect = null) : base(context)
{
// Check luminance format
if (luminanceFormat.IsCompressed() || luminanceFormat.IsPacked() || luminanceFormat.IsTypeless() || luminanceFormat == PixelFormat.None)
{
throw new ArgumentOutOfRangeException("luminanceFormat", "Unsupported format [{0}] (must be not none, compressed, packed or typeless)".ToFormat(luminanceFormat));
}
this.luminanceFormat = luminanceFormat;
// Use or create a default luminance log effect
this.luminanceLogEffect = luminanceLogEffect ?? new LuminanceLogEffect(context).DisposeBy(this);
// Create 1x1 texture
luminance1x1 = Texture.New2D(GraphicsDevice, 1, 1, 1, luminanceFormat, TextureFlags.ShaderResource | TextureFlags.RenderTarget).DisposeBy(this);
// Use a multiscaler
multiScaler = new ImageMultiScaler(context).DisposeBy(this);
// Readback is always going to be done on the 1x1 texture
readback = new ImageReadback <Half>(context).DisposeBy(this);
readback.SetInput(luminance1x1);
// Blur used before upscaling
blur = new GaussianBlur(context).DisposeBy(this);
blur.Radius = 4;
DownscaleCount = 6;
UpscaleCount = 4;
EnableAverageLuminanceReadback = true;
}
/// <summary>
/// Initializes a new instance of the <see cref="GaussianBlur"/> class.
/// </summary>
/// <param name="context">The context.</param>
public GaussianBlur(ImageEffectContext context)
: base(context)
{
// Use shared SharedParameters for blurH and blurV
blurH = new ImageEffectShader(context, "GaussianBlurEffect", Parameters).DisposeBy(this);
// Setup specific Horizontal parameter for blurH
blurH.Parameters.Set(GaussianBlurKeys.VerticalBlur, false);
blurV = new ImageEffectShader(context, "GaussianBlurEffect", Parameters).DisposeBy(this);
// Setup specific Vertical parameter for blurV
blurV.Parameters.Set(GaussianBlurKeys.VerticalBlur, true);
Radius = 4;
SigmaRatio = 2.0f;
}
/// <summary>
/// Initializes a new instance of the <see cref="ColorTransformGroup"/> class.
/// </summary>
/// <param name="context">The context.</param>
/// <param name="colorTransformGroupEffect">The color transform group effect.</param>
public ColorTransformGroup(ImageEffectContext context, string colorTransformGroupEffect = "ColorTransformGroupEffect")
: base(context, colorTransformGroupEffect)
{
compositeKeys = new Dictionary <ParameterCompositeKey, ParameterKey>();
transforms = new ColorTransformCollection();
enabledTransforms = new List <ColorTransform>();
collectTransforms = new List <ColorTransform>();
transformsParameters = new ParameterCollection();
gammaTransform = new GammaTransform();
transformGroupEffect = new ImageEffectShader(context, colorTransformGroupEffect, Parameters);
// we are adding parameter collections after as transform parameters should override previous parameters
transformGroupEffect.ParameterCollections.Add(transformsParameters);
this.context = new ColorTransformContext(this);
}