https://bugs.winehq.org/show_bug.cgi?id=41929
--- Comment #2 from Matteo Bruni matteo.mystral@gmail.com --- Not sure it makes much sense to do a blit with ANISOTROPIC filtering. FWIW https://msdn.microsoft.com/en-us/library/windows/desktop/bb174471(v=vs.85).a... says that only NONE, POINT and LINEAR filtering are allowed in d3d9 StretchRect. I guess the others are supposed to fallback to LINEAR (needs testing) but we're currently using GL_NEAREST in that case.
Is there any visible issue caused by this? Look for blocky textures or similar.