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4/8/2010
By default, when depth-testing is performed on a rendering surface, Microsoft® Direct3D® Mobile updates the render-target surface if the corresponding depth value (z or w) for each point is less than the value in the depth buffer. In an application, you change how the system performs comparisons on depth values by calling the IDirect3DMobileDevice::SetRenderStatemethod with the Stateparameter set to D3DMRS_ZFUNC (see D3DMRENDERSTATETYPE). The Valueparameter should be set to a value in the D3DMCMPFUNCenumerated type.