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4/8/2010
The dithering stage in the pixel processing pipeline is an optional stage. You can call the IDirect3DMobileDevice::SetRenderStatemethod to toggle dithering on or off by setting a value for the D3DMRS_DITHERENABLE render state (see D3DMRENDERSTATETYPE). If dithering is enabled, the driver uses one of its internal dithering algorithms based only on the pixel's location and color value to dither. If dithering is disabled, the pixel value output from the alpha blending processing is not changed.