internal SinglePassTextureFilter(DrawTargetTexture2D source, DrawTargetTexture2D target)
{
if (source == null || target == null)
{
throw new ArgumentNullException();
}
if (source.SurfaceFormat != target.SurfaceFormat)
{
throw new ArgumentException("source.SurfaceFormat != target.SurfaceFormat");
}
#if XBOX360
if (source == target && source.Width * source.Height * DrawTarget.FormatSize(source.SurfaceFormat) >
1000 * 1000 * 10) //approx 10mb
{
throw new ArgumentException("source == target is invalid for larget render targets on Xbox360");
}
#else
if (source == target)
{
throw new ArgumentException("source == target is invalid on windows");
}
#endif
if (source.Width > target.Width ||
source.Height > target.Height)
{
throw new ArgumentException("source is larger than target");
}
this.source = source;
this.targetClone = target.Clone(false, false, false);
this.targetClone.ClearBuffer.Enabled = false;
this.element = new ShaderElement(null, source.Width, source.Height, new Vector2(1, 1), true);
this.targetClone.Add(element);
if (target.Width != source.Width ||
target.Height != source.Height)
{
this.targetClone.AddModifier(new Xen.Graphics.Modifier.ScissorModifier(0, 0, Math.Min(1, (source.Width) / target.Width), Math.Min(1, (source.Height) / target.Height)));
this.element.TextureCrop = new Rectangle(0, 0, Math.Min(this.source.Width, this.targetClone.Width), Math.Min(this.source.Height, this.targetClone.Height));
}
}
/// <summary>
/// Blur the source horizontally to the <paramref name="intermediate"/> target, then blur vertically to <paramref name="target"/>.
/// </summary>
/// <param name="source"></param>
/// <param name="filterFormat">format of the blur filter</param>
/// <param name="intermediate">draw target to use as a temporary, intermediate target for blurring</param>
/// <param name="target"></param>
/// <param name="bellCurveExponent">
/// <para>A scale value to infulence the bell curve used to generate the filter kernel.</para>
/// <para>A value of 1.0 generates a standard blur filter kernels. Larger values will produce a tighter curve, and less blur.</para>
/// <para>Smaller values will produce a wider curve, and a larger blur - but may produce a visible edge as the curve more rapidly ends.</para>
/// </param>
public BlurFilter(BlurFilterFormat filterFormat, float bellCurveExponent, DrawTargetTexture2D source, DrawTargetTexture2D intermediate, DrawTargetTexture2D target)
{
if (target == null || source == null)
{
throw new ArgumentNullException();
}
if (intermediate != null && source.SurfaceFormat != intermediate.SurfaceFormat)
{
throw new ArgumentException("source.SurfaceFormat != intermediate.SurfaceFormat");
}
if (intermediate != null && target.SurfaceFormat != intermediate.SurfaceFormat)
{
throw new ArgumentException("target.SurfaceFormat != intermediate.SurfaceFormat");
}
this.source = source;
#if XBOX360
//if the surface will fit into EDRAM then the intermediate can be skipped
if (source.Width * source.Height * DrawTarget.FormatSize(source.SurfaceFormat) < 1000 * 1000 * 10) //approx
{
this.filterV = new SinglePassTextureFilter(source, target);
this.filterH = new SinglePassTextureFilter(target, target);
}
else
{
this.filterV = new SinglePassTextureFilter(source, intermediate);
this.filterH = new SinglePassTextureFilter(intermediate, source);
}
#else
this.filterV = new SinglePassTextureFilter(source, intermediate);
this.filterH = new SinglePassTextureFilter(intermediate, target);
#endif
SetFilterFormat(filterFormat, bellCurveExponent);
}
