Darkaiser | PPSSPP VR - Crash Bandicoot Games @Darkaiser | Uploaded August 2022 | Updated October 2024, 9 minutes ago.
Built by Lubos in the PPSSPP community, this is an early prototype of a "true" VR emulator that can be installed on the Quest 2 headset. Headtracking works, separate images are rendered to each eye for proper depth perception, and the quest's wireless controllers are automatically mapped to PSP controls.

Because there are no ROM hacks, games will function as originally intended, meaning if you turn your head and look outside the intended field-of-view, there might not be many objects there to see. However, with growing popularity of this emulator, the PSP reverse engineering community can potentially mod games one-by-one to modify frustum culling algorithms, allowing games to render the "full" scene in VR.

In the previous video (Crash Team Racing in VR), the full scene was rendered, because the frustum culling algorithm was modified by the CTR community, allowing the player to turn their head in any direction. However, the CTR video did not have separate-eye-rendering, nor did it work on any other PS1 game.

With PPSSPP universally working on all games, combined with game-specific tweaks to draw the "full" scene, this could be the biggest VR project to ever exist.

How this works (only read if you're a programmer):
The PSP does not multiply Perspective, View, and Model matrix in the game code, there are separate hardware registers for each, and fixed-function hardware multiplies them together. Therefore, the emulator can see each individual matrix, and override the perspective and view matrix for VR. This wont work on universally PS1 because the GTE registers just have the pre-multiplied MVP.