feat: soft shadows — 16-tap Poisson disk PCF on cubemap

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- 16 precomputed Poisson disk offsets on tangent plane
- Tangent basis built from sampling direction (cross product trick)
- Sample radius scales with distance: closer = sharper, farther = softer
  radius = clamp(0.02 * (dist / 20), 0.005, 0.08)
- Early exit: skip PCF if clearly lit or clearly shadowed (performance)
- Bias increased to 0.15 for cubemap distance comparison
- Only triangle.frag changed — no C# or Vulkan resource changes
- 227 tests, all pass

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emil28092005

2026-06-18 21:36:30 +03:00

parent f761973443

commit 7e33b64ac9

2 changed files with 55 additions and 2 deletions

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src/Engine.Graphics.Vulkan/Shaders/triangle.frag.spv

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