src/gallium/drivers/r600/r600_translate.c

   1 /*
   2  * Copyright 2010 Red Hat Inc.
   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  * Authors: Dave Airlie <airlied@redhat.com>
  24  */
  25
  26 #include <util/u_index_modify.h>
  27 #include "util/u_inlines.h"
  28 #include "util/u_upload_mgr.h"
  29 #include "r600_pipe.h"
  30
  31
  32 void r600_translate_index_buffer(struct r600_pipe_context *r600,
  33                                  struct pipe_resource **index_buffer,
  34                                  unsigned *index_size,
  35                                  unsigned *start, unsigned count)
  36 {
  37         struct pipe_resource *out_buffer = NULL;
  38         unsigned out_offset;
  39         void *ptr;
  40         boolean flushed;
  41
  42         switch (*index_size) {
  43         case 1:
  44                 u_upload_alloc(r600->vbuf_mgr->uploader, 0, count * 2,
  45                                &out_offset, &out_buffer, &flushed, &ptr);
  46
  47                 util_shorten_ubyte_elts_to_userptr(
  48                                 &r600->context, *index_buffer, 0, *start, count, ptr);
  49
  50                 pipe_resource_reference(index_buffer, out_buffer);
  51                 *index_size = 2;
  52                 *start = out_offset / 2;
  53                 break;
  54         }
  55 }