I have a finished PC title running on a custom OpenGL renderer. Now I want the same experience on Android, iOS, and macOS, with the first playable build targeted for iOS. The visuals cannot drop in quality—the port must keep: • High-resolution textures • Advanced lighting effects • Particle effects Scope of work – Audit the current OpenGL codebase and abstract any Windows-specific calls. – Adapt the renderer for mobile and Apple Silicon, using OpenGL ES 3.x on Android and Metal (or a proven OpenGL-to-Metal layer) on iOS/macOS. – Re-implement input for touch, gyro, and game-controller APIs. – Optimize assets, memory, and shaders to hit a steady 60 FPS on recent iPhones/iPads, then replicate the same on Android and macOS. – Hook in platform services (App Store, Google Play, Game Center, in-app purchases, achievements, cloud saves). – Provide separate, signed release builds plus source patches and clear build instructions. Acceptance 1. iOS build runs first, faithfully matching gameplay and graphics from the PC version. 2. Android and macOS builds follow, sharing the same asset pipeline and feature set. 3. All listed visual features render correctly, with no critical defects. 4. All platforms (Windows, Android, iOS/MacOS) must be developed from a single unified codebase, which will be delivered to the Client upon project completion. Send a short note confirming relevant OpenGL or Metal porting experience and the toolchain you prefer; I will share the full repository and asset pack once we agree on timelines.