绘制状态 Render States(Direct3D 9)(未完成)

    设备绘制状态几乎影响到所有的绘制流水线的每个部分，IDirect3DDevice9::SetRenderState 用来设置绘制状态。
详细信息包括下列的主题：

Alpha Blending State (Direct3D 9)
  alpha融合状态

Alpha Testing State (Direct3D 9)
  

Ambient Lighting State (Direct3D 9)

Antialiasing State (Direct3D 9)

Culling State (Direct3D 9)

Depth Buffering State (Direct3D 9)

Fog State (Direct3D 9)

Lighting State (Direct3D 9)

Outline and Fill State (Direct3D 9)

Per-Vertex Color State (Direct3D 9)

Primitive Clipping State (Direct3D 9)

Shading State (Direct3D 9)

Stencil Buffer State (Direct3D 9)

Texture Wrapping State (Direct3D 9)