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[GH-ISSUE #306] Request: Shader support #27

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opened 2026-03-03 13:45:07 +03:00 by kerem · 5 comments

kerem commented

2026-03-03 13:45:07 +03:00

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Originally created by @r2rX on GitHub (Mar 7, 2025).
Original GitHub issue: https://github.com/gopher64/gopher64/issues/306

Would be great to eventually have support for (RetroArch) SPIRV shader support (for CRT shaders etc). Otherwise, keep up the great work!

Originally created by @r2rX on GitHub (Mar 7, 2025). Original GitHub issue: https://github.com/gopher64/gopher64/issues/306 Would be great to eventually have support for (RetroArch) SPIRV shader support (for CRT shaders etc). Otherwise, keep up the great work!

kerem

2026-03-03 13:45:07 +03:00

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kerem commented

2026-03-03 13:45:08 +03:00

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@loganmc10 commented on GitHub (Mar 7, 2025):

Thanks, if anyone sees this and wants to give it a try, I assume it is just a matter of adding additional rendering passes here: github.com/gopher64/gopher64@f6b2342e0e/parallel-rdp/interface.cpp (L340-L405)

crt-aperture is probably a good first test, since it is just a single pass: https://github.com/libretro/slang-shaders/blob/master/crt/shaders/crt-aperture.slang

@loganmc10 commented on GitHub (Mar 7, 2025): Thanks, if anyone sees this and wants to give it a try, I assume it is just a matter of adding additional rendering passes here: https://github.com/gopher64/gopher64/blob/f6b2342e0e99094c0da52a1abffe7940ce4a5537/parallel-rdp/interface.cpp#L340-L405 crt-aperture is probably a good first test, since it is just a single pass: https://github.com/libretro/slang-shaders/blob/master/crt/shaders/crt-aperture.slang

kerem commented

2026-03-03 13:45:08 +03:00

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@loganmc10 commented on GitHub (Mar 10, 2025):

I don't always have the best eye for this, @r2rX can you try this build and let me know how the CRT shader looks?

https://github.com/gopher64/gopher64/actions/runs/13766727477

Implementing support for every RetroArch shader would be a very large amount of work, but adding support for a single pass CRT shader is doable.

@loganmc10 commented on GitHub (Mar 10, 2025): I don't always have the best eye for this, @r2rX can you try this build and let me know how the CRT shader looks? https://github.com/gopher64/gopher64/actions/runs/13766727477 Implementing support for every RetroArch shader would be a very large amount of work, but adding support for a single pass CRT shader is doable.

kerem commented

2026-03-03 13:45:08 +03:00

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@r2rX commented on GitHub (Mar 10, 2025):

Hey @loganmc10. The shader appears to be working.

Apply CRT shader on:

Apply CRT shader off:

As a default shader preset, it definitely helps. Of course, desired CRT shader outputs vary from individual preferences/tastes. Out of curiosity, is it technically possible to be able to load (multi or) single pass shaders externally? If not, personally, I'd suggest CRT Royale as a good all-round default preset (although it's multi-pass and might be complicated to get right considering all the tweaks that are possible).

However, this embedded shader does a reasonable job. Cheers!

@r2rX commented on GitHub (Mar 10, 2025): Hey @loganmc10. The shader appears to be working. Apply CRT shader on: ![Image](https://github.com/user-attachments/assets/efd0a9f5-a7ae-4bc3-a7c2-3d06ce1d75e0) Apply CRT shader off: ![Image](https://github.com/user-attachments/assets/54141f63-07f7-48fa-ae31-092af3bbfd9b) As a default shader preset, it definitely helps. Of course, desired CRT shader outputs vary from individual preferences/tastes. Out of curiosity, is it technically possible to be able to load (multi or) single pass shaders externally? If not, personally, I'd suggest CRT Royale as a good all-round default preset (although it's multi-pass and might be complicated to get right considering all the tweaks that are possible). However, this embedded shader does a reasonable job. Cheers!

kerem commented

2026-03-03 13:45:08 +03:00

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@loganmc10 commented on GitHub (Mar 10, 2025):

Out of curiosity, is it technically possible to be able to load (multi or) single pass shaders externally?

Not really. I used crt-aperture from RetroArch because it is a fairly simple single-pass shader, and I had to modify it a bit.

Supporting more complex shaders like CRT Royale would probably mean integrating librashader (https://github.com/SnowflakePowered/librashader). This is possible, but not really a project I would take up. If someone else wants to do it though, I'd be happy to accept a pull request.

@loganmc10 commented on GitHub (Mar 10, 2025): > Out of curiosity, is it technically possible to be able to load (multi or) single pass shaders externally? Not really. I used crt-aperture from RetroArch because it is a fairly simple single-pass shader, and I had to modify it a bit. Supporting more complex shaders like CRT Royale would probably mean integrating librashader (https://github.com/SnowflakePowered/librashader). This is possible, but not really a project I would take up. If someone else wants to do it though, I'd be happy to accept a pull request.

kerem commented

2026-03-03 13:45:08 +03:00

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@r2rX commented on GitHub (Mar 10, 2025):

Fair enough. The crt-aperature shader you embedded makes a difference so it's suitable as the default shader provided. Thank you for taking the time and effort towards this.

@r2rX commented on GitHub (Mar 10, 2025): Fair enough. The crt-aperature shader you embedded makes a difference so it's suitable as the default shader provided. Thank you for taking the time and effort towards this.