libretro: Correctly calculate the aspect ratio

libretro / blastem

Upstream tracking repo of BlastEm, the fast and accurate Genesis emulator, with libretro specific changes

https://www.retrodev.com/blastem/

GNU General Public License v3.0

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Closed Kekun closed 3 years ago

Kekun commented 3 years ago

This ensures the aspect ratio is correctly calculated at all time, for W40 and W32, for NTSC and PAL, and with any overscan.

The calculation was wrong in render_framebuffer_updated().