void RSSetViewports( UINT NumViewports, const D3D10_VIEWPORT *pViewports );
Number of viewports to bind.
Type: const D3D10_VIEWPORT*
An array of viewports (see D3D10_VIEWPORT) to bind to the device. Each viewport must have its extents within the allowed ranges: D3D10_VIEWPORT_BOUNDS_MIN, D3D10_VIEWPORT_BOUNDS_MAX, D3D10_MIN_DEPTH, and D3D10_MAX_DEPTH.
This method does not return a value.
All viewports must be set atomically as one operation. Any viewports not defined by the call are disabled.
Which viewport to use is determined by the SV_ViewportArrayIndex semantic output by a geometry shader (see shader semantic syntax). If a geometry shader does not make use of the SV_ViewportArrayIndex semantic then Direct3D will use the first viewport in the array.