TemporalAntialiasingRenderer

Remarks

The default antialiasing where it can run, and the only one that adds information rather than hiding its absence. FXAA finds edges in a frame and softens them; this jitters the camera by a fraction of a pixel each frame and accumulates the results, so a slow pan genuinely resolves detail below one pixel — which is also why it doubles as the sampling budget for anything stochastic downstream.

It owns its history, and that is the whole difference from every other effect here. A pass cannot read the target it writes, so there are two textures and the node alternates them: this frame reads the one last frame wrote and writes the other. They are imports rather than graph resources, because a transient is dead at the end of the frame and a history that dies every frame is a history of nothing.

The jitter is the host's, and it has to be. This pass resolves samples taken at different subpixel offsets; taking them is the camera's job, before anything is drawn. Jitter is the sequence to offset the projection by — a pass that accumulated an unjittered camera would average the same sample over and over, which is a frame that gets blurrier and no sharper.

Fields and properties (9)

• public required string Source

  The frame it antialiases.

• public required string MotionVectors

  Where each pixel was last frame, in screen space.

• public required string Depth

  The depth, for rejecting history across a silhouette.

• public bool VarianceClipping

  Whether history is clipped to the neighbourhood's variance rather than its bounds.

• public float Feedback

  How much of the history survives each frame, 0 to 1.

• public float VarianceGamma

  How many standard deviations of the neighbourhood the history may be.

• public bool HasHistory

  Whether the history holds anything yet.

• public TextureHandle Target

  The texture this frame resolves into.

• public TextureHandle History

  The texture this frame reads its history from.

Methods (5)

• public TemporalAntialiasingRenderer()

  Temporal antialiasing: the frame resolved against the ones before it.

• public static Vector2 Jitter(int frameIndex)

  The subpixel offset to jitter the projection by, in pixels, for a frame index.

• protected override void DeclareOutput(CompositorFrame frame, Int2 size)

  Declares the resource this effect writes.

• protected override void Configure(CompositorFrame frame, ParameterCollection parameters, IList<ResourceBinding> bindings)

  Fills in this frame's parameters and bindings.

• protected override void Dispose(bool disposing)

  Releases the pass's pipelines and its uniform buffer.

Used by (2)

• PostEffectFactoryVixen.Rendering.PostFx
• PostEffectTestsVixen.Rendering.PostFx.Tests