[Openrm-users] Change to readJPEG

[Tim R. <ro...@ga...>]

While fiddling around with openrm some more, I discovered something odd.  It
appears that openGL wants it's texture images flipped upside down rather than
what one would expect.  I've modified step 6 in readJPEG below, to perform this
flip.  (hopefully I did it right, but it seems to work now for my purposes)

BTW- I just wanted to mention as a side note, I've managed to create a
userdefined primitive for two different animation libraries now (cal3d and
glass).  Both were exceedingly simply to patch into openRM.


    /* Step 6: while (scan lines remain to be read) */
    /*           jpeg_read_scanlines(...); */
     
    /* Here we use the library's state variable cinfo.output_scanline as the
     * loop counter, so that we don't have to keep track ourselves.
   */    
  indx = row_stride * (cinfo.output_height-1);
  while (cinfo.output_scanline < cinfo.output_height) {
    /* jpeg_read_scanlines expects an array of pointers to scanlines.
     * Here the array is only one element long, but you could ask for
     * more than one scanline at a time if that's more convenient.
     */ 
      (void) jpeg_read_scanlines(&cinfo, buffer, 1);
    
      /* Assume put_scanline_someplace wants a pointer and sample count. */
      /*    put_scanline_someplace(buffer[0], row_stride); */
      memcpy(pd+indx, buffer[0], row_stride);
      indx -= row_stride;
  } 

---
Tim Rightnour <ro...@ga...>
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