1/*
2 * Copyright 2016 Red Hat.
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
24#include "sp_context.h"
25#include "sp_buffer.h"
26#include "sp_texture.h"
27
28#include "util/format/u_format.h"
29
30static void *
31sp_tgsi_ssbo_lookup(const struct tgsi_buffer *buffer,
32                    uint32_t unit,
33                    uint32_t *size)
34{
35   struct sp_tgsi_buffer *sp_buf = (struct sp_tgsi_buffer *)buffer;
36
37   *size = 0;
38   if (unit >= PIPE_MAX_SHADER_BUFFERS)
39      return NULL;
40
41   struct pipe_shader_buffer *bview = &sp_buf->sp_bview[unit];
42   /* Sanity check the view size is within our buffer. */
43   if (!bview->buffer ||
44       bview->buffer_offset > bview->buffer->width0 ||
45       bview->buffer_size > bview->buffer->width0 - bview->buffer_offset) {
46      return NULL;
47   }
48
49   struct softpipe_resource *spr = softpipe_resource(bview->buffer);
50   *size = bview->buffer_size;
51   return (char *)spr->data + bview->buffer_offset;
52}
53
54struct sp_tgsi_buffer *
55sp_create_tgsi_buffer(void)
56{
57   struct sp_tgsi_buffer *buf = CALLOC_STRUCT(sp_tgsi_buffer);
58   if (!buf)
59      return NULL;
60
61   buf->base.lookup = sp_tgsi_ssbo_lookup;
62   return buf;
63};
64