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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 
r300_translate_index_buffer(struct r300_context * r300,const struct pipe_draw_info * info,struct pipe_resource ** out_buffer,unsigned * index_size,unsigned index_offset,unsigned * start,unsigned count)28 void r300_translate_index_buffer(struct r300_context *r300,
29                                  const struct pipe_draw_info *info,
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, info, PIPE_TRANSFER_UNSYNCHRONIZED, 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, info,
58                                                 PIPE_TRANSFER_UNSYNCHRONIZED,
59                                                 index_offset, *start,
60                                                 count, ptr);
61 
62             *start = out_offset / 2;
63         }
64         break;
65 
66     case 4:
67         if (index_offset) {
68             *out_buffer = NULL;
69             u_upload_alloc(r300->uploader, 0, count * 4, 4,
70                            &out_offset, out_buffer, &ptr);
71 
72             util_rebuild_uint_elts_to_userptr(&r300->context, info,
73                                               PIPE_TRANSFER_UNSYNCHRONIZED,
74                                               index_offset, *start,
75                                               count, ptr);
76 
77             *start = out_offset / 4;
78         }
79         break;
80     }
81 }
82