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  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.  
  35. struct pipe_context;
  36. struct pipe_screen;
  37. struct svga_context;
  38. struct svga_winsys_surface;
  39. enum 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.  */
  58. struct 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.  
  75. extern struct svga_sampler_view *
  76. svga_get_tex_sampler_view(struct pipe_context *pipe,
  77.                           struct pipe_resource *pt,
  78.                           unsigned min_lod, unsigned max_lod);
  79.  
  80. void
  81. svga_validate_sampler_view(struct svga_context *svga, struct svga_sampler_view *v);
  82.  
  83. void
  84. svga_destroy_sampler_view_priv(struct svga_sampler_view *v);
  85.  
  86. void
  87. svga_debug_describe_sampler_view(char *buf, const struct svga_sampler_view *sv);
  88.  
  89. static INLINE void
  90. svga_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.