[libretro] Game is running but output black on OpenGL CS renderer

[Edojp]

Version is 2.1.2 95a6176

What's the full name of the game (including region) ?
Panzer Dragoon Saga/Azel (Japan)

What's your frontend ? (standalone, libretro, ...) ?
libretro (Retroarch 1.8.8)

What's your OS ? (windows, linux, OSX, ...) ?
Windows 10

What's your hardware ? (CPU, GPU, ...) ?
Intel 9700K, Geforce 2080 Ti (latest drivers)

What's the storage type of the game (official cd, burned cd or cd image) ?
cue/bin image

Are you using any setting different from default ? If so, precise
Have tried basically every setting in core Options, only "fix" is to change renderer to standard OpenGL (but this has different issue, will raise separate item)

Did this game work previously ? Do you remember when ? Is it happening with other games ?
Not sure, first time I am trying Kronos

If applicable, provide error messages, logs, screenshots, or whatever additional information that could help debugging this
Game is clearly running, can hear menus sounds etc. If you open Retroarch menu you can see a snapshot of game in background.

I tried compiling latest version from source but does not compile in Cygwin, libFLAC dependency fails.

libFLAC/stream_decoder.c:1258:26: error: ‘_O_BINARY’ undeclared (first use in this function); did you mean ‘O_BINARY’?

[Edojp]

Retroarch log here

retroarch__2020_06_10__12_20_58.log

[barbudreadmon]

Retroarch issue, dupe of libretro/RetroArch#10486, at some point i fixed it but the fix was reverted. Use glcore video driver until retroarch devs fix that issue again. You can close this issue.

[Edojp]

Lovely thank you.