http://bugs.winehq.org/show_bug.cgi?id=17919
--- Comment #8 from H. Verbeet hverbeet@gmail.com 2009-05-12 02:04:13 --- (In reply to comment #7)
Disabling HDR works throgh. If you don't mind, you can point out the place to set/apply GL_RGBA16F_ARB routine. I may help when I am free.
I'm not completely sure what you're asking, but the "gl_formats_template" table in dlls/wined3d/utils.c maps D3D formats to GL formats. The D3D format in question is WINED3DFMT_R16G16B16A16_FLOAT. The actual texture levels are created in surface_allocate_surface() in dll/wined3d/surface.c, and filled in surface_upload_data().
I don't know if you changed any settings or not, but note that you'll likely need to use FBOs for offscreen rendering for HDR to work properly.