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