• Home
  • History
  • Annotate
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1  /**************************************************************************
2   *
3   * Copyright 2010 VMware, Inc.
4   * All Rights Reserved.
5   *
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:
13   *
14   * The above copyright notice and this permission notice (including the
15   * next paragraph) shall be included in all copies or substantial portions
16   * of the Software.
17   *
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.
25   *
26   **************************************************************************/
27  
28  
29  #include "u_format.h"
30  #include "u_sampler.h"
31  
32  
33  /**
34   * Initialize a pipe_sampler_view.  'view' is considered to have
35   * uninitialized contents.
36   */
37  static void
default_template(struct pipe_sampler_view * view,const struct pipe_resource * texture,enum pipe_format format,unsigned expand_green_blue)38  default_template(struct pipe_sampler_view *view,
39                   const struct pipe_resource *texture,
40                   enum pipe_format format,
41                   unsigned expand_green_blue)
42  {
43     memset(view, 0, sizeof(*view));
44  
45     /* XXX: Check if format is compatible with texture->format.
46      */
47  
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;
58  
59     /* Override default green and blue component expansion to the requested
60      * one.
61      *
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
65      * components.
66      *
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
70      * over another.
71      */
72     if (format != PIPE_FORMAT_A8_UNORM) {
73        const struct util_format_description *desc = util_format_description(format);
74  
75        assert(desc);
76        if (desc) {
77           if (desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_0) {
78              view->swizzle_g = expand_green_blue;
79           }
80           if (desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_0) {
81              view->swizzle_b = expand_green_blue;
82           }
83        }
84     }
85  }
86  
87  void
u_sampler_view_default_template(struct pipe_sampler_view * view,const struct pipe_resource * texture,enum pipe_format format)88  u_sampler_view_default_template(struct pipe_sampler_view *view,
89                                  const struct pipe_resource *texture,
90                                  enum pipe_format format)
91  {
92     /* Expand to (0, 0, 0, 1) */
93     default_template(view,
94                      texture,
95                      format,
96                      PIPE_SWIZZLE_ZERO);
97  }
98  
99  void
u_sampler_view_default_dx9_template(struct pipe_sampler_view * view,const struct pipe_resource * texture,enum pipe_format format)100  u_sampler_view_default_dx9_template(struct pipe_sampler_view *view,
101                                      const struct pipe_resource *texture,
102                                      enum pipe_format format)
103  {
104     /* Expand to (1, 1, 1, 1) */
105     default_template(view,
106                      texture,
107                      format,
108                      PIPE_SWIZZLE_ONE);
109  }
110