[Bug 38648] Multiple games and applications need support for Mesa OpenGL >= 3.2 core profiles, Shader Model 4, GLSL 1.50 (Microsoft Office 2013 installer, .NET/XNA games)

https://bugs.winehq.org/show_bug.cgi?id=38648

--- Comment #14 from Henri Verbeet  ---
(In reply to Matthew Millar from comment #13)
> As I understand it, this issue is the result of flawed logic in the
> shader_model selection criteria resulting in shader_model variable in
> dlls/wined3d/glsl_shader.c being set to 2 or 3, when it should be 4 for Mesa.

No, you're misunderstanding the issue. We can't currently do shader model 4 on
Mesa, so "3" is correct. The subset of shader model 4 that the office installer
needs happens to work, but geometry shaders for example would fail.