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