Iris & Oculus Flywheel Compat

The rendering library turns off its optimizations whenever a shaderpack is enabled, because its own shader stops working under Iris or Oculus. This mod forces those optimizations back on. It merges the library's shader into the shaderpack's shader so that entities can still be drawn with instancing. The mod requires Iris Shaders, Oculus and Sodium, and Create is an optional dependency. Create Deep Seas also requires this mod.

Instancing helps most when many identical entities are drawn at once, such as the gears in Create. The gain depends on the GPU: the more capable the graphics card, the larger the frame-rate difference, because the original method is limited by a heavy CPU bottleneck when entity counts are high. With no shaderpack enabled, the mod does nothing, since the optimizations already run by default.

The mod is published for Fabric, Forge and NeoForge across 14 release versions, 1.18.2 – 1.21.1, and is open source under the CC0 1.0 Universal license. Players add it to their own game, and a server needs no copy. The source code and issue tracker are public.