src/mesa/state_tracker/st_gen_mipmap.c

   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
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  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  */
  52 void
  53 st_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->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->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->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->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->GenerateMipmap = GL_TRUE;
  97
  98       _mesa_prepare_mipmap_levels(ctx, texObj, baseLevel, lastLevel);
  99
 100       texObj->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.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->pipe->screen->get_param(st->pipe->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 }