Dx9,如何获得depth-buffer surface里面的depth information?
SDK文档
ms-help://MS.VSCC.2003/MS.DirectX9.1033/DirectX9_c/directx/graphics/programmingguide/gettingstarted/rendering/depthbuffers/depthbuffers.htm
里面有一句:
The depth-buffer surface that is associated with the render-target surface is used to store depth information that tells Direct3D how deep each visible pixel is in the scene.
我想知道怎样才能拿到那些depth information。