Compatibility Report

• Name of the game with compatibility issues:
  ENDLESS Legend 2 Demo
• Steam AppID of the game:
  AppID: 3596660

Same issue reported to happen with actual game, AppID 3407390 here:
https://www.protondb.com/app/3407390

System Information

• GPU: Intel Arc B580
• Video driver version: Mesa main
• Kernel version: 6.16.0+ (drm-tip)
• Proton version: Proton 9.0-4 and also happens with Proton experimental

I confirm:

• [x] that I haven't found an existing compatibility report for this game.
• [x] that I have checked whether there are updates for my system available.

Symptoms

Ground is not rendering correctly. This is likely because a tessellation shader fails to compile, more information and shader itself available in Mesa issue: https://gitlab.freedesktop.org/mesa/mesa/-/issues/13694 .

Reproduction

Launch game tutorial on Mesa release version. Debug version will hit asserts in spirv translation which indicates that either Proton has issue within spirv generation or game itself already has issue in the shader.