Add dynamic lighting with Fast/Fancy quality toggle

[MCbabel]

Description

This adds dynamic lighting to the game, similar to how OptiFine handles it in Java Edition. A lot of people on the discord server have been asking for this so I went ahead and implemented it. It's off by default and can be toggled on in the graphics settings menu.

There's two modes: Fast (cheaper, only player held items glow, smaller radius) and Fancy (full entity lighting including dropped items, blazes, burning mobs etc).

Gameplay footage

https://youtu.be/0wDQjRi5HqM

Changes

Previous Behavior

No dynamic lighting existed. Holding a torch in your hand didn't illuminate the area around you. Only placed light sources (torches, glowstone blocks etc) emitted light.

Root Cause

The original LCE codebase never had dynamic lighting - it wasn't part of TU19. OptiFine added this to Java Edition as a popular mod feature but it never made it into the console versions.

New Behavior

Players holding light-emitting items (torches, glowstone, lava buckets etc) now light up the surrounding area in real-time. In Fancy mode, dropped items and certain entities also emit light. The setting persists between sessions.

Fix Implementation

• Added getDynamicLight() and updateDynamicLights() to Level which collects light sources from players/entities each tick and provides additional brightness to the rendering pipeline via Region::getLightColor() and Level::getLightColor()
• Added Item::getItemLightLevel() to query light emission for held/dropped items
• Thread-safe using CRITICAL_SECTION since chunk rebuilds happen on separate threads
• Two quality modes controlled via a slider in graphics settings:
  • Fast: Manhattan distance, players only, radius capped at 6
  • Fancy: Euclidean distance, all entities, radius capped at 10
• Patched all resolution variants of the graphics menu SWF (1080, 720, 480, Split1080, Split720) to include the new checkbox and slider
• Settings stored in the existing uiBitmaskValues bitmask (bits 24-25) so they persist in settings.dat
• Purely visual, does not affect mob spawning or any gameplay mechanics

Related Issues

• N/A (feature request from discord community)

[mattsumi]

This PR is REJECTED and will be closed because:

Heavy AI usage.
This user has been blacklisted from contributing.

Look at our CONTRIBUTING.md for more info.

[MCbabel]

@mattsumi “vibe coded”? Well, I'd really appreciate a more specific reason other than just that my changes are “vibe coded.”

[MCbabel]

@mattsumi To be honest, I think it's pretty ridiculous and disrespectful to label my changes as “vibe coded” and then not give me a specific reason why my code is supposed to be “vibe coded” now.