Adding CRT Guest Advanced as effect

[Jobima1st]

Expected behavior 预期的功能

Hi
In case you don't know "CRT Guest Advanced" is the most advanced CRT shader that still get updates so it will be nice if it ported to Magpie

Also there are ntsc-adaptive to port as another option to use since there are only GTU_v050 in Magpie now

Alternative behavior (optional) 近似的功能（可选）

No response

[Blinue]

CRT Guest Advanced: https://github.com/libretro/slang-shaders/blob/master/crt/crt-guest-advanced.slangp
NTSC-Adaptive: https://github.com/libretro/slang-shaders/blob/master/ntsc/ntsc-adaptive.slangp

These shaders look quite impressive, yet they’re also complex. It would be great to integrate them into Magpie. Thank you for your recommendation!

GitHub

slang-shaders/crt/crt-guest-advanced.slangp at master · libretro/slang-shaders

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GitHub

slang-shaders/ntsc/ntsc-adaptive.slangp at master · libretro/slang-shaders

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[Jobima1st]

I just noted this https://github.com/SnowflakePowered/librashader
this should make all retroarch shaders run without any edit rather than port them one by one

GitHub

GitHub - SnowflakePowered/librashader: RetroArch Shaders for All

RetroArch Shaders for All . Contribute to SnowflakePowered/librashader development by creating an account on GitHub.

[Blinue]

The project was discussed in #785. Magpie has its own shader syntax, which is simple and efficient. Introducing a large third-party dependency may not be worthwhile.