Angry Birds graphical glitch for Libretro port

[Panderner]

This graphical glitch in Angry Birds that only occurs in Libretro version but not in standalone version.

PPSSPP Standalone:

PPSSPP Libretro:

[hrydgard]

Very wacky - is this with OpenGL or Vulkan?

[Panderner]

Yes I'm using OpenGL.

[Panderner]

There's also a glitches in Vulkan where the image are stretched and rotated in landscape modes:

Portrait:

Landscape:

Reversed Landscape:

[hrydgard]

That libretro rotation issue should be in its own issue, I think - it's got nothing to do with Angry Birds.

Is the glitch still present?

[Panderner]

Still happens in Latest Libretro Version (Still uses v1.11-229-g8d610a6)
This does not occur on my PC using OpenGL and Android phone using Vulkan.
This issue is only occured for OpenGL Android Devices.

[hrydgard]

Really weird one, heh.

[gouchi]

@Panderner Please rename the issue title to Angry Birds graphical glitch for Libretro port using OpenGL video driver on Android.

Thank you.

[gouchi]

I reproduce the issue with gl driver (Adreno 504 GPU).