Problem: the Lumetri vignette scaled its horizontal coordinate by
`1 + vround * 0.0` and applied aspect correction only for negative
Roundness, so 0 … +100 rendered identically (CPU path, the GPU op and the
GPU shader parameters alike). Negative values moved towards a circle,
the direction positive values should go.
Fix: one helper, `gpufx::lumetri_vignette_aspect`, scales the horizontal
coordinate by aspect^roundness: 0 keeps the ellipse that follows the
frame, +100 is a circle, negative values widen the oval. Non-finite or
out-of-range values fall back safely. The CPU path, the CPU FxOp and the
GPU parameter packing all use it, so they stay in parity.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
vangel76andClaude Opus 5.5
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