Request: Add Custom ViRefresh usage for .ini Support, like that of Project64

[KMFDManic]

I see @loganmc10 had added an implementation of it previously, here

https://github.com/libretro/mupen64plus-libretro/commit/935f05af377841f994757761b53e716ac38d476f#diff-8c909056b29fb457c997cf3740a527a694b460b1bd5a3aa588d260e56033e4dd

It was reverted 2 days later by logan. Not sure exactly why. But, I recall testing that exact commit when it was posted and adding a few custom values on "slower" problematic games, and netting more playable results.

Project64 currently has many values for custom ViRefresh here:

https://github.com/project64/project64/blob/develop/Config/Project64.rdb

Testing some of the ViRefresh values makes some games functionally better, playability wise, especially if you are on a platform like a retropie 3, and so on.

Just curious if this would be able to be added to Mupen NX, as I personally feel it would come in handy on the less powerful platforms, particularly. Thank you so much for your perusal and humoring me on this request.

[Jj0YzL5nvJ]

Mupen64Plus-AE fork uses a similar hack...

[mudl0rd]

To me there still needs to be a more performant GLES2/GLES3/GL3.3 renderer for lower end systems, with some semblance of support for framebuffers. But thats problematic due to:

• Low VRAM since some FB effects are heavy especially on higher than native res
• GLES2 doesn't support a lot of texture formats, needing optimized texture loading to convert to RGBA/RGB565.
• GLES2 doesn't support integers in shaders, a major problem for accuracy, considering everything in RDP is fixed-point.