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Any item that uses an _emissive texture variant will render at full brightness - glowing in your hand, in inventories, and anywhere items are rendered. No shaders. No OptiFine.
This is a lightweight, client-side mod designed to feel like a missing vanilla feature.
Simply add an _emissive texture variant to your item model. Item Glow handles the rest. No configs required. No special APIs. Just works.
Example: https://bobotweaks.gitbook.io/item-glow/

Adds emissive rendering to items. Items with _emissive textures glow at full brightness in-hand, in GUIs, and when rendered. Client-side, lightweight, and compatible with modded items and resource packs.