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using-metalfx-frame-interpolation

ALWAYS use to add MetalFX frame interpolation with a dedicated PresentThread for precise dual-frame presentation to a Metal app. Use this skill when the user wants to add frame interpolation, frame generation, double the framerate, or mentions MTLFXFrameInterpolator (Metal 3) or MTL4FXFrameInterpolator (Metal 4). This skill assumes temporal upscaling is already integrated (use using-metalfx-temporal-upscaler first if not). Also trigger when the user says "add frame gen", "120fps", "interpolate frames", or wants smoother motion.

game-porting-skills/skills/using-metalfx-frame-interpolation/SKILL.md

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# Adding MetalFX Frame Interpolation to a Metal App

This skill adds MetalFX frame interpolation to a Metal app that already has a MetalFX temporal scaler integrated. The interpolator generates intermediate frames between real rendered frames, effectively doubling the display framerate (e.g., 60fps render → 120fps display).

Two API variants exist:
- **Metal 3** — `MTLFXFrameInterpolator` (macOS 15.0+ / iOS 18.0+)
- **Metal 4** — `MTL4FXFrameInterpolator` (macOS 26.0+ / iOS 26.0+), which inherits from the shared `MTLFXFrameInterpolatorBase` protocol

All per-frame properties are identical across both APIs (they live on `MTLFXFrameInterpolatorBase`). The differences are the creation call, the command buffer type used for encoding, and the support check — see the notes below.

**Prerequisite:** The app must already have MetalFX temporal upscaling working. If not, use the `using-metalfx-temporal-upscaler` skill first.

## Abstraction Strategy