Washed-out colors on non-HDR displays

Is there an existing issue for this?

• This is a bug in RetroArch frontend
• I have searched the existing issues

Description

When using Retroarch on my built-in macbook pro display, the colors look good. However, when moving the Retroarch window to an external non-HDR display, the colors on N64 games using Mupen64Plus-Next (have not tried others) are too washed out.

Internal display looks good:

External display (set to PC gamma and the following brightness and contrast) seems washed-out:

I seem to remember that there was a gamma setting in Retroarch, but it appears to have disappeared.

Expected behavior

When on external display, expect the colors to be closer to the built-in one.

Steps to reproduce the bug

1. Load game using Mupen64Plus-Next
2. Look at colors while on internal display
3. Drag Retroarch to external non-HDR and compare them.

Version/Commit

1.15.0

Bisect Results

No response

Present in the nightly version

I don't know

Platform & operating system

macOS 15.4.1 M1 Pro Macbook Pro

Affected Cores

Mupen64Plus-Next

Environment information

No response

Relevant log output

Start by reproducing the color difference described on macOS 15.4.1 with an M1 Pro MacBook Pro, an external non-HDR display, RetroArch 1.15.0, and the Mupen64Plus-Next core. Done means colors on the external display are closer to those on the built-in display, with the relevant behavior verified against the listed reproduction steps.