feat: add ghost mode grayscale screen effect

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- FXAA path: repurpose _pad field as 'desaturate' push constant; when
  ghostMode_ is true, convert final pixel to grayscale with slight cool
  blue tint using luma(0.299,0.587,0.114) mix
- Non-FXAA path: apply a high-opacity gray overlay (rgba 0.5,0.5,0.55,0.82)
  over the scene for a washed-out look
- Both parallel (SEC_POST) and single-threaded render paths covered
- ghostMode_ flag set each frame from gameHandler->isPlayerGhost()

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Kelsi 2026-03-13 00:59:36 -07:00

parent d3159791de

commit acf99354b3

4 changed files with 26 additions and 5 deletions

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