Direct3D seems to define exact depth bias scale factors per format.
In order to make depth bias work reliably across OpenGL drivers we need
to slightly adjust depth bias values passed to glPolygonOffset().
Signed-off-by: Józef Kucia <jkucia@codeweavers.com>
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>