Dolphin core + DX11 = black screen when shaders are enabled

Is there an existing issue for this?

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

Description

Referring to the issue report:
https://github.com/libretro/dolphin/issues/378

This appears to be a bug in the DX11 driver in Retroarch.
On all other drivers, such as GL Core, Vulkan, DX9, 10, and 12, the core with shaders enabled works correctly, just not with DX11.

log with "Koko-aio shaders" enabled and changed to "Mega-bezel". In each case, there is a black screen.

retroarch__2026_08_17__14_17_39.log

Expected behavior

No response

Steps to reproduce the bug

1. Load any game with Dolphin core and shader enabled

Version/Commit

1.22.2 8b7fc7da

Bisect Results

No response

Present in the nightly version

Yes, this is reproduced in the nightly build

Platform & operating system

Windows 11

Affected Cores

Dolphin core

Environment information

No response

Relevant log output

Start by reproducing a Dolphin-core game on Windows 11 with DX11 and a shader enabled, then compare the behavior with the referenced log and the working GL Core, Vulkan, DX9, DX10, and DX12 drivers. Investigate the RetroArch DX11 driver and shader path. Done means the game renders normally with Koko-aio or Mega-bezel shaders under DX11 without regressing the other drivers.