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[kos]

I'm trying to do this way :

CALfloat* fdata = NULL;
  CALfloat* idata = reinterpret_cast<CALfloat*>( data);
  calResMap((CALvoid**)&fdata, &pitch, Res, 0);
  for (int i = 0; i < region.first; ++i)
  {
  CALfloat* tmp = &fdata[i * pitch];
  for (int j = 0; j < region.second; ++j)
  {
  tmp[2*j] = *(idata + (i*pitch) + 2*j);
  tmp[2*j+1] = *(idata + (i*pitch) + 2*j+1);
  }
  }

but sometimes pitch > width.

[gaurav_garg]

tmp[2*j] = *(idata + (i*pitch) + 2*j);   tmp[2*j+1] = *(idata + (i*pitch) + 2*j+1); but sometimes pitch > width.

Source pointer indexing needs to be done using width-

tmp[2*j] = *(idata + (i*width) + 2*j);   tmp[2*j+1] = *(idata + (i*width) + 2*j+1);

Take a look at method CopyDataToGPU used in CAL samples.

[kos]

Thank you that helps.