See Also
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Primitives that have no textures are rendered with the color specified by their material, or with the colors specified for the vertices, if any. You can select the method to fill them by specifying a value defined by the D3DMFILLMODEenumerated type for the D3DMRS_FILLMODE render state (see D3DMRENDERSTATETYPE).
To enable dithering, your application must pass the D3DRS_DITHERENABLEenumerated value as the first parameter to IDirect3DMobileDevice::SetRenderState. It must set the second parameter to TRUE to enable dithering, and FALSE to disable it.
At times, drawing the last pixel in a line can cause unsightly overlap with surrounding primitives. You can control this using the D3DMRS_LASTPIXEL render state. However, do not alter this setting without some forethought. Under some conditions, suppressing the rendering of the last pixel can cause unsightly gaps between primitives.