https://bugs.freedesktop.org/show_bug.cgi?id=30488
--- Comment #3 from Marek Olšák maraeo@gmail.com 2010-12-14 06:51:12 PST --- I think I can see the problem. Wine uses the subset of ARB_texture_rg that depends on ARB_texture_float, i.e. it can only be used if ARB_texture_float is supported, but Wine doesn't appear to care and uses it anyway. This should be fixed in Wine.
Does setting this environment variable like this help?
MESA_EXTENSION_OVERRIDE=-GL_ARB_texture_rg