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       icetCompositeMode -- set the type of operation used for compositing


       #include <IceT.h>

       void icetCompositeMode(   IceTEnum   mode  );


       Sets  the  composite  mode  used when combining images. IceT enables parallel rendering by
       allowing each process in your code to independently render  images  of  partial  geometry.
       These partial-geometry images are then ``composited'' to form a single image equivalent to
       if all the geometry were rendered by a single process.

       IceT supports multiple operations that can be used to combine images.   The  operator  you
       use  should  be  equivalent  to  that  used  by your rendering system to resolve .ighidden
       surfacehidden surfaces or mix occluding geometry with that behind it.

       The argument mode is one of the following enumerations:

               Use the .igz-bufferz-buffer  hidden-surface  removal  operation.  The  compositing
              operation  compares  the  distance of pixel fragments from the viewpoint and passes
              the fragment closest to the user. In order for this operation to work, images  must
              have a depth buffer (set with icetSetDepthFormat).

               Blend   two   fragments  together  using  the  standard  .igover  operator.igunder
              operatorover/under operator. in order for this operation to work, images must  have
              a  color  buffer  (set  with icetSetColorFormat)that has an alpha channel and there
              must be no depth buffer (as the operation makes no sense with depth).   Also,  this
              mode  will only work if ICET_ORDERED_COMPOSITE is enabled and the order is set with

       The default compositing mode is ICET_COMPOSITE_MODE_Z_BUFFER.  The current composite  mode
       is stored in the ICET_COMPOSITE_MODE state variable.


               mode is not a valid composite mode.




       icetCompositeMode  will  let  you set a mode even if it is incompatible with other current
       settings.  Some  settings  will  be  checked   during   a   call   to   icetDrawFrame   or
       icetCompositeImage.     For    example,    if    the    image   format   (specified   with
       icetSetColorFormatand icetSetDepthFormat)does not support the composite mode  picked,  you
       will get an error during the call to icetDrawFrame.

       Other incompatibilities are also not checked. For example, if the composite mode is set to
       ICET_COMPOSITE_MODE_BLEND,   IceT   will   happily   use    this    operator    even    if
       ICET_ORDERED_COMPOSITE  is  not enabled. However, because order matters in the blend mode,
       you will probably get incorrect images if the compositing happens in arbitrary order.


       Copyright (C)2010 Sandia Corporation

       Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government
       retains certain rights in this software.

       This source code is released under the New BSD License.

See Also

       icetCompositeOrder(3), icetSetColorFormat(3), icetSetDepthFormat(3)

IceT Reference                          September 26, 2014                   icetCompositeMode(3)