We decided on fixing this issue at the frontend level instead of the core side. Our apologies for this secondary PR, we'd appreciate if it could be merged quickly.
base_width/base_height should be set to the lowest/default PSP internal resolution, which in this case is 480x272. Setting base_width/height the same as max_width/max_height would create problems with windowed mode in RetroArch, it would try to create a huge window (often times far exceeding the desktop size).
* Do not call methods on gpu if it is null. Fixes 13412 (sans video rewind).
* Do not call methods on gpu if it is null. Fixes#13412 (sans video rewind).
* Ensure PSP is init before measuring state size.
* Continue running core until GPU is ready.
* Libretro: Bypass state measure during init.
* Sync ffmpeg version with master.
* Do not call methods on gpu if it is null. Fixes#13412 (sans video rewind).
* Ensure PSP is init before measuring state size.
* Continue running core until GPU is ready.
* Libretro: Bypass state measure during init.
* Sync ffmpeg version with master.
