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A Variety Of Unreal Engine 4 Linux Demos Are Now Available
Pay attention to the header of the window, then compare GLSL version to that of driver. We ain't fully OpenGL4.x yet.
Unreal Engine 4 use OpenGL 3.2 renderer by default.
There is OpenGL 4.x renderer, but it's have to be activated manually.
And yeah this TGSI error completely unrelated to GLSL version support, it's shader complication backend error.
Unfortunately default R600 shader compiler fail to compile many complicated shaders and LLVM backend is incomplete.
PS: This doesn't change fact that UE4 still have bugs that make it incompatible with Mesa, but this TGSI error is completely unrelated.