This makes it consistent with dxgi_adapter.

This fixes a regression introduced by 2b2fc827.

Found by Valgrind.

If the surface is part of a texture it doesn't keep its own reference to the
device, but instead relies on the reference the texture has. This fixes a
regression introduced by ff92e6eb.

If the surface is part of a texture it doesn't keep its own reference to the
device, but instead relies on the reference the texture has. This fixes a
regression introduced by 3cedef2f.

This is needed because the window(and thus the GL drawable) might be
smaller than the D3D backbuffer. If we waited for the FBO switch until
Present is called we'd lose data in the first frame.

This is used by the offscreen render target->texture blit code if
FBOs are enabled, but FBO_blit is not supported

Found by Valgrind.

Found by Valgrind.

Found by Valgrind.