src/mesa/drivers/dri/i965/intel_resolve_map.h

   1 /*
   2  * Copyright © 2011 Intel Corporation
   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  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #ifndef INTEL_RESLVE_MAP_H
  25 #define INTEL_RESLVE_MAP_H
  26
  27 #include <stdint.h>
  28 #include "blorp/blorp.h"
  29 #include "compiler/glsl/list.h"
  30
  31 #ifdef __cplusplus
  32 extern "C" {
  33 #endif
  34
  35 /**
  36  * \brief Map of miptree slices to needed resolves.
  37  *
  38  * The map is implemented as a linear doubly-linked list.
  39  *
  40  * In the intel_resolve_map*() functions, the \c head argument is not
  41  * inspected for its data. It only serves as an anchor for the list.
  42  *
  43  * \par Design Discussion
  44  *
  45  *     There are two possible ways to record which miptree slices need
  46  *     resolves. 1) Maintain a flag for every miptree slice in the texture,
  47  *     likely in intel_mipmap_level::slice, or 2) maintain a list of only
  48  *     those slices that need a resolve.
  49  *
  50  *     Immediately before drawing, a full depth resolve performed on each
  51  *     enabled depth texture. If design 1 were chosen, then at each draw call
  52  *     it would be necessary to iterate over each miptree slice of each
  53  *     enabled depth texture in order to query if each slice needed a resolve.
  54  *     In the worst case, this would require 2^16 iterations: 16 texture
  55  *     units, 16 miplevels, and 256 depth layers (assuming maximums for OpenGL
  56  *     2.1).
  57  *
  58  *     By choosing design 2, the number of iterations is exactly the minimum
  59  *     necessary.
  60  */
  61 struct intel_resolve_map {
  62    struct exec_node link;
  63
  64    uint32_t level;
  65    uint32_t layer;
  66
  67    enum blorp_hiz_op need;
  68 };
  69
  70 void
  71 intel_resolve_map_set(struct exec_list *resolve_map,
  72                       uint32_t level,
  73                       uint32_t layer,
  74                       unsigned new_state);
  75
  76 const struct intel_resolve_map *
  77 intel_resolve_map_find_any(const struct exec_list *resolve_map,
  78                            uint32_t start_level, uint32_t num_levels,
  79                            uint32_t start_layer, uint32_t num_layers);
  80
  81 static inline const struct intel_resolve_map *
  82 intel_resolve_map_const_get(const struct exec_list *resolve_map,
  83                             uint32_t level,
  84                             uint32_t layer)
  85 {
  86    return intel_resolve_map_find_any(resolve_map, level, 1, layer, 1);
  87 }
  88
  89 static inline struct intel_resolve_map *
  90 intel_resolve_map_get(struct exec_list *resolve_map,
  91                       uint32_t level,
  92                       uint32_t layer)
  93 {
  94    return (struct intel_resolve_map *)intel_resolve_map_find_any(
  95                                          resolve_map, level, 1, layer, 1);
  96 }
  97
  98 void
  99 intel_resolve_map_remove(struct intel_resolve_map *resolve_map);
 100
 101 void
 102 intel_resolve_map_clear(struct exec_list *resolve_map);
 103
 104 #ifdef __cplusplus
 105 } /* extern "C" */
 106 #endif
 107
 108 #endif /* INTEL_RESLVE_MAP_H */