1/**************************************************************************
2 *
3 * Copyright 2008 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 "main/errors.h"
30
31#include "main/mipmap.h"
32#include "main/teximage.h"
33
34#include "pipe/p_context.h"
35#include "pipe/p_defines.h"
36#include "util/u_inlines.h"
37#include "util/format/u_format.h"
38#include "util/u_gen_mipmap.h"
39
40#include "st_debug.h"
41#include "st_context.h"
42#include "st_texture.h"
43#include "st_util.h"
44#include "st_gen_mipmap.h"
45#include "st_cb_bitmap.h"
46#include "st_cb_texture.h"
47
48void
49st_generate_mipmap(struct gl_context *ctx, GLenum target,
50                   struct gl_texture_object *texObj)
51{
52   struct st_context *st = st_context(ctx);
53   struct pipe_resource *pt = st_get_texobj_resource(texObj);
54   uint baseLevel = texObj->Attrib.BaseLevel;
55   enum pipe_format format;
56   uint lastLevel, first_layer, last_layer;
57
58   if (!pt)
59      return;
60
61   if (texObj->Immutable)
62      baseLevel += texObj->Attrib.MinLevel;
63
64   /* not sure if this ultimately actually should work,
65      but we're not supporting multisampled textures yet. */
66   assert(pt->nr_samples < 2);
67
68   /* find expected last mipmap level to generate*/
69   lastLevel = _mesa_compute_num_levels(ctx, texObj, target) - 1;
70
71   if (texObj->Immutable)
72      lastLevel += texObj->Attrib.MinLevel;
73
74   if (lastLevel == 0)
75      return;
76
77   st_flush_bitmap_cache(st);
78   st_invalidate_readpix_cache(st);
79
80   /* The texture isn't in a "complete" state yet so set the expected
81    * lastLevel here, since it won't get done in st_finalize_texture().
82    */
83   texObj->lastLevel = lastLevel;
84
85   if (!texObj->Immutable) {
86      const GLboolean genSave = texObj->Attrib.GenerateMipmap;
87
88      /* Temporarily set GenerateMipmap to true so that allocate_full_mipmap()
89       * makes the right decision about full mipmap allocation.
90       */
91      texObj->Attrib.GenerateMipmap = GL_TRUE;
92
93      _mesa_prepare_mipmap_levels(ctx, texObj, baseLevel, lastLevel);
94
95      texObj->Attrib.GenerateMipmap = genSave;
96
97      /* At this point, memory for all the texture levels has been
98       * allocated.  However, the base level image may be in one resource
99       * while the subsequent/smaller levels may be in another resource.
100       * Finalizing the texture will copy the base images from the former
101       * resource to the latter.
102       *
103       * After this, we'll have all mipmap levels in one resource.
104       */
105      st_finalize_texture(ctx, st->pipe, texObj, 0);
106   }
107
108   pt = texObj->pt;
109   if (!pt) {
110      _mesa_error(ctx, GL_OUT_OF_MEMORY, "mipmap generation");
111      return;
112   }
113
114   assert(pt->last_level >= lastLevel);
115
116   if (pt->target == PIPE_TEXTURE_CUBE) {
117      first_layer = last_layer = _mesa_tex_target_to_face(target);
118   }
119   else {
120      first_layer = 0;
121      last_layer = util_max_layer(pt, baseLevel);
122   }
123
124   if (texObj->surface_based)
125      format = texObj->surface_format;
126   else
127      format = pt->format;
128
129   if (texObj->Sampler.Attrib.sRGBDecode == GL_SKIP_DECODE_EXT)
130      format = util_format_linear(format);
131
132   /* First see if the driver supports hardware mipmap generation,
133    * if not then generate the mipmap by rendering/texturing.
134    * If that fails, use the software fallback.
135    */
136   if (!st->screen->get_param(st->screen,
137                              PIPE_CAP_GENERATE_MIPMAP) ||
138       !st->pipe->generate_mipmap(st->pipe, pt, format, baseLevel,
139                                  lastLevel, first_layer, last_layer)) {
140
141      if (!util_gen_mipmap(st->pipe, pt, format, baseLevel, lastLevel,
142                           first_layer, last_layer, PIPE_TEX_FILTER_LINEAR)) {
143         _mesa_generate_mipmap(ctx, target, texObj);
144      }
145   }
146}
147