1/**********************************************************
2 * Copyright 2008-2009 VMware, Inc.  All rights reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person
5 * obtaining a copy of this software and associated documentation
6 * files (the "Software"), to deal in the Software without
7 * restriction, including without limitation the rights to use, copy,
8 * modify, merge, publish, distribute, sublicense, and/or sell copies
9 * of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 *
24 **********************************************************/
25
26#ifndef SVGA_SAMPLER_VIEW_H
27#define SVGA_SAMPLER_VIEW_H
28
29
30#include "pipe/p_compiler.h"
31#include "pipe/p_state.h"
32#include "util/u_inlines.h"
33#include "svga_screen_cache.h"
34
35struct pipe_context;
36struct pipe_screen;
37struct svga_context;
38struct svga_winsys_surface;
39enum SVGA3dSurfaceFormat;
40
41
42/**
43 * A sampler's view into a texture
44 *
45 * We currently cache one sampler view on
46 * the texture and in there by holding a reference
47 * from the texture to the sampler view.
48 *
49 * Because of this we can not hold a refernce to the
50 * texture from the sampler view. So the user
51 * of the sampler views must make sure that the
52 * texture has a reference take for as long as
53 * the sampler view is refrenced.
54 *
55 * Just unreferencing the sampler_view before the
56 * texture is enough.
57 */
58struct svga_sampler_view
59{
60   struct pipe_reference reference;
61
62   struct pipe_resource *texture;
63
64   int min_lod;
65   int max_lod;
66
67   unsigned age;
68
69   struct svga_host_surface_cache_key key;
70   struct svga_winsys_surface *handle;
71};
72
73
74
75extern struct svga_sampler_view *
76svga_get_tex_sampler_view(struct pipe_context *pipe,
77                          struct pipe_resource *pt,
78                          unsigned min_lod, unsigned max_lod);
79
80void
81svga_validate_sampler_view(struct svga_context *svga, struct svga_sampler_view *v);
82
83void
84svga_destroy_sampler_view_priv(struct svga_sampler_view *v);
85
86void
87svga_debug_describe_sampler_view(char *buf, const struct svga_sampler_view *sv);
88
89static INLINE void
90svga_sampler_view_reference(struct svga_sampler_view **ptr, struct svga_sampler_view *v)
91{
92   struct svga_sampler_view *old = *ptr;
93
94   if (pipe_reference_described(&(*ptr)->reference, &v->reference,
95                                (debug_reference_descriptor)svga_debug_describe_sampler_view))
96      svga_destroy_sampler_view_priv(old);
97   *ptr = v;
98}
99
100
101#endif
102