src/gallium/drivers/r300/r300_render_translate.c

   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, 4,
  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, 4,
  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, 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 }