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NAME

       icetGet -- get an IceT state parameter

Synopsis

       #include <IceT.h>

       void icetGetDoublev(   IceTEnum       pname,
                              IceTDouble *   params  );

       void icetGetFloatv(   IceTEnum      pname,
                             IceTFloat *   params  );

       void icetGetIntegerv(   IceTEnum    pname,
                               IceTInt *   params  );

       void icetGetBooleanv(   IceTEnum        pname,
                               IceTBoolean *   params  );

       void icetGetEnumv(   IceTEnum     pname,
                            IceTEnum *   params  );

       void icetGetBitFieldv(   IceTEnum         pname,
                                IceTBitField *   params  );

       void icetGetPointerv(   IceTEnum      pname,
                               IceTVoid **   params  );

Description

       Like  OpenGL ,the operation of IceT is defined by a large state machine.  Also like OpenGL
       ,the state parameters can be retrieved through the icetGet functions. Each function  takes
       a  symbolic  constant,  pname, which identifies the state parameter to retrieve. They also
       each take an array, params, which will be filled with the values  in  pname.   It  is  the
       calling  application's  responsibility to ensure that params is big enough to hold all the
       data.

State Parameters

       The following list identifies valid values for pname and a description of  the  associated
       state parameter.

       ICET_BACKGROUND_COLOR
               The  color  that IceT is currently assuming is the background color. It is an RGBA
              value that is stored as four floating point values. This value is set either to the
              last  value  passed  to  icetDrawFrame or icetCompositeImage, the OpenGL background
              color if icetGLDrawFrame was called, or to black for color blending.  (The  correct
              background color is restored later.)

       ICET_BACKGROUND_COLOR_WORD
               The  same  as  ICET_BACKGROUND_COLOR except that each component is stored as 8-bit
              RGBA values and packed in a 4-byte  integer.  The  idea  is  to  rapidly  fill  the
              background of color buffers.

       ICET_BLEND_TIME
               The  total  time,  in seconds, spent in performing color blending of images during
              the last call to icetDrawFrame, icetCompositeImage, or icetGLDrawFrame.  Stored  as
              a double. An alias for this value is ICET_COMPARE_TIME.

       ICET_BUFFER_READ_TIME
               The  total  time,  in  seconds,  spent copying buffer data and reading from OpenGL
              buffers  during  the   last   call   to   icetDrawFrame,   icetCompositeImage,   or
              icetGLDrawFrame.  Stored as a double.

       ICET_BUFFER_WRITE_TIME
               The  total  time, in seconds, spent writing to OpenGL buffers during the last call
              to  icetGLDrawFrame.   Always  set  to  0.0  after  a  call  to  icetDrawFrame   or
              icetCompositeImage.  Stored as a double.

       ICET_BYTES_SENT
               The  total number of bytes sent by the calling process for transferring image data
              during the last call  to  icetDrawFrame,  icetCompositeImage,  or  icetGLDrawFrame.
              Stored as an integer.

       ICET_COLLECT_TIME
               The total time spent in collecting image fragments to display processes during the
              last call to icetDrawFrame, icetCompositeImage, or icetGLDrawFrame.

       ICET_COLOR_FORMAT
               The color format of images to be created by the rendering subsystem and composited
              by    IceT    .Use    icetSetColorFormat    to    set   the   color   format.   Use
              icetImageGetColorFormat to safely get the color format for a particular image.

       ICET_COMPARE_TIME
               The total time, in seconds, spent in performing Z comparisons of images during the
              last  call  to  icetDrawFrame, icetCompositeImage, or icetGLDrawFrame.  Stored as a
              double. An alias for this value is ICET_BLEND_TIME.

       ICET_COMPOSITE_MODE
               The composite mode  set  by  icetCompositeMode.   A  single  entry  stored  as  an
              IceTEnum.

       ICET_COMPOSITE_ORDER
               The  order  in  which  images  are  to  be composited if ICET_ORDERED_COMPOSITE is
              enabled and the  current  strategy  supports  ordered  compositing.  The  parameter
              contains  ICET_NUM_PROCESSES  entries.  The  value  of  this  parameter is set with
              icetCompositeOrder.  If the element of index i in the array is set to j, then there
              are i images ``on top'' of the image generated by process j.

       ICET_COMPOSITE_TIME
               The  total  time,  in  seconds,  spent  in  compositing  during  the  last call to
              icetDrawFrame,    icetCompositeImage,     or     icetGLDrawFrame.      Equal     to
              $ICET_TOTAL_DRAW_TIME     -     ICET_RENDER_TIME    -    ICET_BUFFER_READ_TIME    -
              ICET_BUFFER_WRITE_TIME$.  Stored as a double.

       ICET_COMPRESS_TIME
               The total time, in seconds, spent in compressing image  data  using  active  pixel
              encoding   during   the   last   call   to  icetDrawFrame,  icetCompositeImage,  or
              icetGLDrawFrame.  Stored as a double.

       ICET_DATA_REPLICATION_GROUP
               An array of process ids.  There are  ICET_DATA_REPLICATION_GROUP_SIZE  entries  in
              the  array.  IceT assumes that all processes in the list will create the exact same
              image with their draw functions (set with icetDrawCallback or  icetGLDrawCallback).
              The local process id (ICET_RANK) will be part of this list.

       ICET_DATA_REPLICATION_GROUP_SIZE
               The length of the ICET_DATA_REPLICATION_GROUP array.

       ICET_DEPTH_FORMAT
               The depth format of images to be created by the rendering subsystem and composited
              by   IceT   .Use   icetSetDepthFormat   to    set    the    depth    format.    Use
              icetImageGetDepthFormat to safely get the depth format for a particular image.

       ICET_DIAGNOSTIC_LEVEL
               The diagnostics flags set with icetDiagnostics.

       ICET_DISPLAY_NODES
               An  array  of process ranks. The size of the array is equal to the number of tiles
              (ICET_NUM_TILES).  The $i^{th}$ entry is the rank of the process that is displaying
              the tile described by the $i^{th}$ entry in ICET_TILE_VIEWPORTS.

       ICET_DRAW_FUNCTION
               A pointer to the drawing callback function, as set by icetDrawCallback.

       ICET_FRAME_COUNT
               The number of times icetDrawFrame, icetCompositeImage, or icetGLDrawFrame has been
              called for the current context.

       ICET_GEOMETRY_BOUNDS
               An array of vertices whose  convex  hull  bounds  the  drawn  geometry.  Set  with
              icetBoundingVertices or icetBoundingBox.  Each vertex has three coordinates and are
              tightly   packed   in   the   array.   The   size   of   the   array   is   $3    *
              ICET_NUM_BOUNDING_VERTS$.

       ICET_GLOBAL_VIEWPORT
               Defines  a  viewport in an infinite logical display that covers all tile viewports
              (listed in ICET_TILE_VIEWPORTS).  The viewport, like an OpenGL viewport,  is  given
              as  the  integer  four-tuple  $<x,  y,  width,  height >$.x and y are placed at the
              leftmost and lowest position of all the tiles, and width and height  are  just  big
              enough for the viewport to cover all tiles.

       ICET_INTERLACE_TIME
               The total time, in seconds, spent in copying pixels to interlace images for better
              load balancing during  the  last  call  to  icetDrawFrame,  icetCompositeImage,  or
              icetGLDrawFrame.  Stored as a double.

       ICET_MAGIC_K
               The target k value used when compositing with the radix-k single image strategy.

       ICET_MAX_IMAGE_SPLIT
               The  target  number  of  maximum  image  splits  to  be  performed  by compositing
              strategies.

       ICET_NUM_BOUNDING_VERTS
               The number of bounding vertices listed in the ICET_GEOMETRY_BOUNDS parameter.

       ICET_NUM_TILES
               The number of tiles in the defined display. Basically equal to the number of times
              icetAddTile was called after the last icetResetTiles.

       ICET_NUM_PROCESSES
               The  number  of  processes  in  the  parallel job as given by the IceTCommunicator
              object associated with the current context.

       ICET_PHYSICAL_RENDER_HEIGHT
               The height of the images generated by the rendering system. This  is  set  to  the
              OpenGL  viewport  height  by  icetGLDrawFrame or otherwise by explicitly setting it
              with icetPhysicalRenderSize or otherwise implicitly  to  the  largest  tile  height
              specified with icetAddTile.

       ICET_PHYSICAL_RENDER_WIDTH
               The  width  of  the  images  generated by the rendering system. This is set to the
              OpenGL viewport width by icetGLDrawFrame or otherwise by explicitly setting it with
              icetPhysicalRenderSize  or otherwise implicitly to the largest tile width specified
              with icetAddTile.

       ICET_PROCESS_ORDERS
               Basically,  the  inverse  of   ICET_COMPOSITE_ORDER.    The   parameter   contains
              ICET_NUM_PROCESSES  entries.  If  the  element of index i in the array is set to j,
              then there are j images ``on top'' of the image generated by process i.

       ICET_RANK
               The rank of the process as given by the IceTCommunicator  object  associated  with
              the current context.

       ICET_RENDER_TIME
               The  total time, in seconds, spent in the drawing callback during the last call to
              icetDrawFrame  or  icetGLDrawFrame.   Always  set  to   0.0   after   a   call   to
              icetCompositeImage.  Stored as a double.

       ICET_SINGLE_IMAGE_STRATEGY
               The   single   image   sub-strategy   set   with   icetSingleImageStrategy.    Use
              icetGetSingleImageStrategyName to get a user-readable name  for  the  single  image
              strategy.

       ICET_STRATEGY
               The   strategy   set   with   icetStrategy.   Use  icetGetStrategyName  to  get  a
              user-readable name for the strategy.

       ICET_STRATEGY_SUPPORTS_ORDERING
               Is true if and only if the current strategy supports ordered compositing.

       ICET_TILE_DISPLAYED
               The index of the tile the local process is displaying. The index  will  correspond
              to  the tile entry in the ICET_DISPLAY_NODES and ICET_TILE_VIEWPORTS arrays. If set
              to $0 <= i < ICET_NUM_PROCESSES$, then the $i^{th}$ entry of ICET_DISPLAY_NODES  is
              equal  to  ICET_RANK.   If  the  local  process  is  not  displaying any tile, then
              ICET_TILE_DISPLAYED is set to -1.

       ICET_TILE_MAX_HEIGHT
               The maximum height of any tile.

       ICET_TILE_MAX_WIDTH
               The maximum width of any tile.

       ICET_TILE_VIEWPORTS
               A list of viewports in  the  logical  global  display  defining  the  tiles.  Each
              viewport  is  the  four-tuple  $<x,  y,  width,  height >$defining the position and
              dimensions of a tile in pixels, much like a viewport is defined in OpenGL .The size
              of  the  array is $4 * ICET_NUM_TILES$.  The viewports are listed in the same order
              as the tiles were defined with icetAddTile.

       ICET_TOTAL_DRAW_TIME
               Time  spent  in  the  last   call   to   icetDrawFrame,   icetCompositeImage,   or
              icetGLDrawFrame.   This  includes  all the time to render, read back, compress, and
              composite images. Stored as a double.

       ICET_VALID_PIXELS_NUM
               In conjunction with ICET_VALID_PIXELS_OFFSET, gives the range of valid pixels  for
              the last image returned from icetDrawFrame, icetCompositeImage, or icetGLDrawFrame.
              Given  the   arrays   of   pixels   returned   with   the   icetImageGetColor   and
              icetImageGetDepth  functions,  the  valid  pixels  start  at  the  pixel indexed by
              ICET_VALID_PIXELS_OFFSET and continue for ICET_VALID_PIXELS_NUM.  The tile to which
              these  pixels  belong are captured in the ICET_VALID_PIXELS_TILE state variable. If
              the last call to icetDrawFrame,  icetCompositeImage,  or  icetGLDrawFrame  did  not
              return  pixels for the local process, ICET_VALID_PIXELS_NUM is set to 0. This state
              variable is only useful when ICET_COLLECT_IMAGES is off. If on, it can  be  assumed
              that  all  display processes contain all pixels in the image (ICET_VALID_PIXELS_NUM
              is the number of pixels in the image), and all other processes have no pixel data.

       ICET_VALID_PIXELS_OFFSET
               In conjunction with ICET_VALID_PIXELS_NUM, gives the range of valid pixels for the
              last  image  returned  from  icetDrawFrame, icetCompositeImage, or icetGLDrawFrame.
              Given  the   arrays   of   pixels   returned   with   the   icetImageGetColor   and
              icetImageGetDepth  functions,  the  valid  pixels  start  at  the  pixel indexed by
              ICET_VALID_PIXELS_OFFSET and continue for ICET_VALID_PIXELS_NUM.  The tile to which
              these pixels belong are captured in the ICET_VALID_PIXELS_TILE state variable. This
              state variable is only useful when ICET_COLLECT_IMAGES is off. If  on,  it  can  be
              assumed   that   all   display   processes   contain   all   pixels  in  the  image
              (ICET_VALID_PIXELS_OFFSET is 0), and all other processes have no pixel data.

       ICET_VALID_PIXELS_TILE
               Gives  the  tile  for  which  the  last   image   returned   from   icetDrawFrame,
              icetCompositeImage,  or  icetGLDrawFrame contains pixels.  Each process has its own
              value. If the last call to icetDrawFrame,  icetCompositeImage,  or  icetGLDrawFrame
              did not return pixels for the local process, then this state variable is set to -1.
              This state variable is only useful when ICET_COLLECT_IMAGES is off. If on,  it  can
              be  assumed  that  all  display  processes  have  valid pixels for their respective
              display tiles, and all other processes have no pixel data.

       In addition, if you are using the OpenGL layer (i.e., have called icetGLInitialize), these
       variables, defined in IceTGL.h, are also available.

       ICET_GL_DRAW_FUNCTION
               A pointer to the OpenGL drawing callback function, as set by icetGLDrawCallback.

       ICET_GL_READ_BUFFER
               The OpenGL buffer to read from (and write to). Set with icetGLSetReadBuffer.

Errors

       ICET_BAD_CAST
               The state parameter requested is of a type that cannot be cast to the output type.

       ICET_INVALID_ENUM
               pname is not a valid state parameter.

Warnings

       None.

Bugs

       None known.

Notes

       Not  every state variable is documented here. There is a set of parameters used internally
       by IceT or are more appropriately retrieved with other functions such as icetIsEnabled.

Copyright

       Copyright (C)2003 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

       icetIsEnabled(3), icetGetStrategyName(3)

IceT Reference                          February 10, 2015                              icetGet(3)