feat: post processing

[jiayev]

A full Post Processing Pipeline.

Features:

• Auto Exposure
• Local Exposure
• COD Bloom
• Physical Glare
• Lens Flare
• Motion Blur
• Cinematic DOF
• Color Grading and Tone Mapping
• LUT
• Camera FX
• Vignette
• Border

With:

• HDR Support
• Rich Color Grading Parameters
• Multiple Tonemappers
• Automatic Color Space Management
• High Gamut Rendering Support

Summary by CodeRabbit

• New Features

  • Full post-processing suite: Depth‑of‑Field, COD bloom, lens flare, physical glare, motion blur, composite pass, LUT support, vignette, camera effects, border mask, local & histogram auto‑exposure, and preset system with custom bokeh shape loading.

• Improvements

  • Advanced color grading with multiple tonemappers, ACEScg support and option to bypass vanilla tonemapping.
  • Enhanced HDR/UI compositing and gamut handling for more accurate lighting, tonemapping, and UI blending.