Solid-wireframe model using OpenGL/Direct3D

Depth bias not be supported on line and point mode. 

In solid wireframe , we should enable polygon offset on solid model first, and then disable polygon offset on wireframe model.

OpenGL:
glEnable( GL_POLYGON_OFFSET_FILL );
glPolygonOffset( bias, 1 );

glDisable( GL_POLYGON_OFFSET_FILL );

D3D:
device->SetRenderState( D3DRS_DEPTHBIAS, (DWORD)bias );
device->SetRenderState( D3DRS_DEPTHBIAS, (DWORD)0 );

Reference:

http://msdn.microsoft.com/en-us/library/windows/desktop/bb205599(v=vs.85).aspx

http://lwjgl.org/forum/index.php?topic=1162.0;wap2