message: fix some outdated calls in DFB logging
diff: @@ -169,7 +169,7 @@ namespace ospray {
  {
  SCOPED_LOCK(mutex);
  - DBG(printf("rank %i starting new frame\n", mpi::world.rank));
  + DBG(printf("rank %i starting new frame\n", mpicommon::globalRank()));
  assert(!frameIsActive);
  if (pixelOp)
  @@ -348,7 +348,7 @@ namespace ospray {
  void DFB::tileIsCompleted(TileData *tile)
  {
  - DBG(printf("rank %i: tilecompleted %i,%i\n",mpi::world.rank,
  + DBG(printf("rank %i: tilecompleted %i,%i\n",mpicommon::globalRank(),
  tile->begin.x,tile->begin.y));
  if (mpicommon::IamTheMaster() && tile->ownerID == mpicommon::masterRank()) {
  @@ -385,7 +385,7 @@ namespace ospray {
  SCOPED_LOCK(mutex);
  numTilesCompletedByMe = ++numTilesCompletedThisFrame;
  DBG(printf("rank %i: MARKING AS COMPLETED %i,%i -> %i %i\n",
  - mpi::world.rank,
  + mpicommon::globalRank(),
  tile->begin.x,tile->begin.y,(int)numTilesCompletedThisFrame,
  numTiles.x*numTiles.y));
  }
  @@ -500,7 +500,7 @@ namespace ospray {
  void DFB::closeCurrentFrame()
  {
  - DBG(printf("rank %i CLOSES frame\n", mpi::world.rank));
  + DBG(printf("rank %i CLOSES frame\n", mpicommon::globalRank()));
  frameIsActive = false;
  frameIsDone = true;
  