1 /**************************************************************************
3 * Copyright 2010 VMware, Inc.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
30 #include "u_sampler.h"
34 * Initialize a pipe_sampler_view. 'view' is considered to have
35 * uninitialized contents.
38 default_template(struct pipe_sampler_view
*view
,
39 const struct pipe_resource
*texture
,
40 enum pipe_format format
,
41 unsigned expand_green_blue
)
43 memset(view
, 0, sizeof(*view
));
45 /* XXX: Check if format is compatible with texture->format.
48 view
->format
= format
;
49 view
->u
.tex
.first_level
= 0;
50 view
->u
.tex
.last_level
= texture
->last_level
;
51 view
->u
.tex
.first_layer
= 0;
52 view
->u
.tex
.last_layer
= texture
->target
== PIPE_TEXTURE_3D
?
53 texture
->depth0
- 1 : texture
->array_size
- 1;
54 view
->swizzle_r
= PIPE_SWIZZLE_RED
;
55 view
->swizzle_g
= PIPE_SWIZZLE_GREEN
;
56 view
->swizzle_b
= PIPE_SWIZZLE_BLUE
;
57 view
->swizzle_a
= PIPE_SWIZZLE_ALPHA
;
59 /* Override default green and blue component expansion to the requested
62 * Gallium expands nonexistent components to (0,0,0,1), DX9 expands
63 * to (1,1,1,1). Since alpha is always expanded to 1, and red is
64 * always present, we only really care about green and blue
67 * To make it look less hackish, one would have to add
68 * UTIL_FORMAT_SWIZZLE_EXPAND to indicate components for expansion
69 * and then override without exceptions or favoring one component
72 if (format
!= PIPE_FORMAT_A8_UNORM
) {
73 const struct util_format_description
*desc
= util_format_description(format
);
77 if (desc
->swizzle
[1] == UTIL_FORMAT_SWIZZLE_0
) {
78 view
->swizzle_g
= expand_green_blue
;
80 if (desc
->swizzle
[2] == UTIL_FORMAT_SWIZZLE_0
) {
81 view
->swizzle_b
= expand_green_blue
;
88 u_sampler_view_default_template(struct pipe_sampler_view
*view
,
89 const struct pipe_resource
*texture
,
90 enum pipe_format format
)
92 /* Expand to (0, 0, 0, 1) */
93 default_template(view
,
100 u_sampler_view_default_dx9_template(struct pipe_sampler_view
*view
,
101 const struct pipe_resource
*texture
,
102 enum pipe_format format
)
104 /* Expand to (1, 1, 1, 1) */
105 default_template(view
,