FSR 2 API calls are lightweight (~0.05 ms on x64 CPU). Heavy work is in shaders.
This document explains how to integrate AMD FidelityFX Super Resolution 2 (FSR 2) into a Vulkan-based port or mod of Final Fantasy X (FFX) using an x64 DLL injection approach. It covers goals, high-level architecture, required components, key API interactions, threading/latency considerations, implementation steps, testing, and common pitfalls. This is an engineering overview, not a complete code listing. ffx fsr2 api vk x64dll work