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
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   uint baseLevel = texObj->Attrib.BaseLevel;
60   enum pipe_format format;
61   uint lastLevel, first_layer, last_layer;
62
63   if (!pt)
64      return;
65
66   if (texObj->Immutable)
67      baseLevel += texObj->Attrib.MinLevel;
68
69   /* not sure if this ultimately actually should work,
70      but we're not supporting multisampled textures yet. */
71   assert(pt->nr_samples < 2);
72
73   /* find expected last mipmap level to generate*/
74   lastLevel = _mesa_compute_num_levels(ctx, texObj, target) - 1;
75
76   if (texObj->Immutable)
77      lastLevel += texObj->Attrib.MinLevel;
78
79   if (lastLevel == 0)
80      return;
81
82   st_flush_bitmap_cache(st);
83   st_invalidate_readpix_cache(st);
84
85   /* The texture isn't in a "complete" state yet so set the expected
86    * lastLevel here, since it won't get done in st_finalize_texture().
87    */
88   stObj->lastLevel = lastLevel;
89
90   if (!texObj->Immutable) {
91      const GLboolean genSave = texObj->Attrib.GenerateMipmap;
92
93      /* Temporarily set GenerateMipmap to true so that allocate_full_mipmap()
94       * makes the right decision about full mipmap allocation.
95       */
96      texObj->Attrib.GenerateMipmap = GL_TRUE;
97
98      _mesa_prepare_mipmap_levels(ctx, texObj, baseLevel, lastLevel);
99
100      texObj->Attrib.GenerateMipmap = genSave;
101
102      /* At this point, memory for all the texture levels has been
103       * allocated.  However, the base level image may be in one resource
104       * while the subsequent/smaller levels may be in another resource.
105       * Finalizing the texture will copy the base images from the former
106       * resource to the latter.
107       *
108       * After this, we'll have all mipmap levels in one resource.
109       */
110      st_finalize_texture(ctx, st->pipe, texObj, 0);
111   }
112
113   pt = stObj->pt;
114   if (!pt) {
115      _mesa_error(ctx, GL_OUT_OF_MEMORY, "mipmap generation");
116      return;
117   }
118
119   assert(pt->last_level >= lastLevel);
120
121   if (pt->target == PIPE_TEXTURE_CUBE) {
122      first_layer = last_layer = _mesa_tex_target_to_face(target);
123   }
124   else {
125      first_layer = 0;
126      last_layer = util_max_layer(pt, baseLevel);
127   }
128
129   if (stObj->surface_based)
130      format = stObj->surface_format;
131   else
132      format = pt->format;
133
134   if (texObj->Sampler.Attrib.sRGBDecode == GL_SKIP_DECODE_EXT)
135      format = util_format_linear(format);
136
137   /* First see if the driver supports hardware mipmap generation,
138    * if not then generate the mipmap by rendering/texturing.
139    * If that fails, use the software fallback.
140    */
141   if (!st->screen->get_param(st->screen,
142                              PIPE_CAP_GENERATE_MIPMAP) ||
143       !st->pipe->generate_mipmap(st->pipe, pt, format, baseLevel,
144                                  lastLevel, first_layer, last_layer)) {
145
146      if (!util_gen_mipmap(st->pipe, pt, format, baseLevel, lastLevel,
147                           first_layer, last_layer, PIPE_TEX_FILTER_LINEAR)) {
148         _mesa_generate_mipmap(ctx, target, texObj);
149      }
150   }
151}
152