wehub-resource-sync
33 lines
1.3 KiB
C#
33 lines
1.3 KiB
C#
using System.Numerics;
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using T3.Core.Operator;
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namespace T3.Core.Rendering;
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/// <summary>
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/// Applies the TXAA sub-pixel camera jitter published via the <c>_TXAA_JitterOffset</c> context
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/// variable (in pixels, e.g. from [Vec2JitterOffset]) to a projection matrix.
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/// </summary>
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public static class CameraJitter
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{
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/// <summary>
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/// Adds the jitter as a constant NDC translation (a tiny lens shift) rather than an eye
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/// offset — moving the eye would cause depth-dependent parallax the TAA resolve can't undo.
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/// </summary>
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public static void ApplyFromContext(EvaluationContext context, ref Matrix4x4 camToClipSpace)
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{
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if (!context.ObjectVariables.TryGetValue(VariableName, out var jitterValue))
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return;
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var jitterInPixels = jitterValue switch
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{
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Vector2 v2 => v2,
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Vector3 v3 => new Vector2(v3.X, v3.Y),
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_ => Vector2.Zero
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};
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camToClipSpace.M31 += jitterInPixels.X * 2f / context.RequestedResolution.Width;
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camToClipSpace.M32 += jitterInPixels.Y * 2f / context.RequestedResolution.Height;
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}
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private const string VariableName = "_TXAA_JitterOffset";
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}
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