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  1. /*
  2.  * Copyright 2010 Marek Olšák <maraeo@gmail.com>
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * on the rights to use, copy, modify, merge, publish, distribute, sub
  8.  * license, and/or sell copies of the Software, and to permit persons to whom
  9.  * the Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice (including the next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  18.  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  19.  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  20.  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  21.  * USE OR OTHER DEALINGS IN THE SOFTWARE. */
  22.  
  23. #include "r300_context.h"
  24. #include "util/u_index_modify.h"
  25. #include "util/u_upload_mgr.h"
  26.  
  27.  
  28. void r300_translate_index_buffer(struct r300_context *r300,
  29.                                  struct pipe_index_buffer *ib,
  30.                                  struct pipe_resource **out_buffer,
  31.                                  unsigned *index_size, unsigned index_offset,
  32.                                  unsigned *start, unsigned count)
  33. {
  34.     unsigned out_offset;
  35.     void *ptr;
  36.  
  37.     switch (*index_size) {
  38.     case 1:
  39.         *out_buffer = NULL;
  40.         u_upload_alloc(r300->uploader, 0, count * 2,
  41.                        &out_offset, out_buffer, &ptr);
  42.  
  43.         util_shorten_ubyte_elts_to_userptr(
  44.                 &r300->context, ib, index_offset,
  45.                 *start, count, ptr);
  46.  
  47.         *index_size = 2;
  48.         *start = out_offset / 2;
  49.         break;
  50.  
  51.     case 2:
  52.         if (index_offset) {
  53.             *out_buffer = NULL;
  54.             u_upload_alloc(r300->uploader, 0, count * 2,
  55.                            &out_offset, out_buffer, &ptr);
  56.  
  57.             util_rebuild_ushort_elts_to_userptr(&r300->context, ib,
  58.                                                 index_offset, *start,
  59.                                                 count, ptr);
  60.  
  61.             *start = out_offset / 2;
  62.         }
  63.         break;
  64.  
  65.     case 4:
  66.         if (index_offset) {
  67.             *out_buffer = NULL;
  68.             u_upload_alloc(r300->uploader, 0, count * 4,
  69.                            &out_offset, out_buffer, &ptr);
  70.  
  71.             util_rebuild_uint_elts_to_userptr(&r300->context, ib,
  72.                                               index_offset, *start,
  73.                                               count, ptr);
  74.  
  75.             *start = out_offset / 4;
  76.         }
  77.         break;
  78.     }
  79. }
  80.