Source/System/Cluster/Window/BalancedMultiWindow/OSGBalancedMultiWindow.inl

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  36
  37 //---------------------------------------------------------------------------
  38 //  Includes
  39 //---------------------------------------------------------------------------
  40
  41 OSG_BEGIN_NAMESPACE
  42
  43 /*! calculate the load for a given group rendered into the given rectangle
  44  */
  45
  46 inline
  47 Real32 BalancedMultiWindow::getVisibleLoad(Int32 const (&rect)[4],
  48                                            BBox      &bbox)
  49 {
  50     LoadGroup &group=_cluster.loadGroups[bbox.groupId];
  51     // invisible
  52     if(bbox.rect[LEFT]   > rect[RIGHT] ||
  53        bbox.rect[RIGHT]  < rect[LEFT] ||
  54        bbox.rect[BOTTOM] > rect[TOP] ||
  55        bbox.rect[TOP]    < rect[BOTTOM])
  56         return 0;
  57     Int32 l = osgMax(rect[0],bbox.rect[0]);
  58     Int32 b = osgMax(rect[1],bbox.rect[1]);
  59     Int32 r = osgMin(rect[2],bbox.rect[2]);
  60     Int32 t = osgMin(rect[3],bbox.rect[3]);
  61     Real32 visibleArea = (r-l+1) * (t-b+1);
  62     Real32 area = (bbox.rect[2] - bbox.rect[0] + 1) *
  63                   (bbox.rect[3] - bbox.rect[1] + 1);
  64     // constant
  65     Real32 load = group.constant;
  66     // pixel
  67     load += visibleArea * group.pixel;
  68     // relative
  69     if(area)
  70         load += group.ratio * visibleArea / area;
  71     return load;
  72 }
  73
  74 OSG_END_NAMESPACE