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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  26  **************************************************************************/
  27
  28
  29 #include "main/imports.h"
  30 #include "main/mipmap.h"
  31 #include "main/teximage.h"
  32
  33 #include "pipe/p_context.h"
  34 #include "pipe/p_defines.h"
  35 #include "util/u_inlines.h"
  36 #include "util/u_format.h"
  37 #include "util/u_gen_mipmap.h"
  38
  39 #include "st_debug.h"
  40 #include "st_context.h"
  41 #include "st_texture.h"
  42 #include "st_gen_mipmap.h"
  43 #include "st_cb_bitmap.h"
  44 #include "st_cb_texture.h"
  45
  46
  47 /**
  48  * Compute the expected number of mipmap levels in the texture given
  49  * the width/height/depth of the base image and the GL_TEXTURE_BASE_LEVEL/
  50  * GL_TEXTURE_MAX_LEVEL settings.  This will tell us how many mipmap
  51  * levels should be generated.
  52  */
  53 static GLuint
  54 compute_num_levels(struct gl_context *ctx,
  55                    struct gl_texture_object *texObj,
  56                    GLenum target)
  57 {
  58    const struct gl_texture_image *baseImage;
  59    GLuint numLevels;
  60
  61    baseImage = _mesa_get_tex_image(ctx, texObj, target, texObj->BaseLevel);
  62
  63    numLevels = texObj->BaseLevel + baseImage->MaxNumLevels;
  64    numLevels = MIN2(numLevels, (GLuint) texObj->MaxLevel + 1);
  65    if (texObj->Immutable)
  66       numLevels = MIN2(numLevels, texObj->NumLevels);
  67    assert(numLevels >= 1);
  68
  69    return numLevels;
  70 }
  71
  72
  73 /**
  74  * Called via ctx->Driver.GenerateMipmap().
  75  */
  76 void
  77 st_generate_mipmap(struct gl_context *ctx, GLenum target,
  78                    struct gl_texture_object *texObj)
  79 {
  80    struct st_context *st = st_context(ctx);
  81    struct st_texture_object *stObj = st_texture_object(texObj);
  82    struct pipe_resource *pt = st_get_texobj_resource(texObj);
  83    const uint baseLevel = texObj->BaseLevel;
  84    enum pipe_format format;
  85    uint lastLevel, first_layer, last_layer;
  86
  87    if (!pt)
  88       return;
  89
  90    /* not sure if this ultimately actually should work,
  91       but we're not supporting multisampled textures yet. */
  92    assert(pt->nr_samples < 2);
  93
  94    /* find expected last mipmap level to generate*/
  95    lastLevel = compute_num_levels(ctx, texObj, target) - 1;
  96
  97    if (lastLevel == 0)
  98       return;
  99
 100    st_flush_bitmap_cache(st);
 101    st_invalidate_readpix_cache(st);
 102
 103    /* The texture isn't in a "complete" state yet so set the expected
 104     * lastLevel here, since it won't get done in st_finalize_texture().
 105     */
 106    stObj->lastLevel = lastLevel;
 107
 108    if (!texObj->Immutable) {
 109       const GLboolean genSave = texObj->GenerateMipmap;
 110
 111       /* Temporarily set GenerateMipmap to true so that allocate_full_mipmap()
 112        * makes the right decision about full mipmap allocation.
 113        */
 114       texObj->GenerateMipmap = GL_TRUE;
 115
 116       _mesa_prepare_mipmap_levels(ctx, texObj, baseLevel, lastLevel);
 117
 118       texObj->GenerateMipmap = genSave;
 119
 120       /* At this point, memory for all the texture levels has been
 121        * allocated.  However, the base level image may be in one resource
 122        * while the subsequent/smaller levels may be in another resource.
 123        * Finalizing the texture will copy the base images from the former
 124        * resource to the latter.
 125        *
 126        * After this, we'll have all mipmap levels in one resource.
 127        */
 128       st_finalize_texture(ctx, st->pipe, texObj, 0);
 129    }
 130
 131    pt = stObj->pt;
 132    if (!pt) {
 133       _mesa_error(ctx, GL_OUT_OF_MEMORY, "mipmap generation");
 134       return;
 135    }
 136
 137    assert(pt->last_level >= lastLevel);
 138
 139    if (pt->target == PIPE_TEXTURE_CUBE) {
 140       first_layer = last_layer = _mesa_tex_target_to_face(target);
 141    }
 142    else {
 143       first_layer = 0;
 144       last_layer = util_max_layer(pt, baseLevel);
 145    }
 146
 147    if (stObj->surface_based)
 148       format = stObj->surface_format;
 149    else
 150       format = pt->format;
 151
 152    /* First see if the driver supports hardware mipmap generation,
 153     * if not then generate the mipmap by rendering/texturing.
 154     * If that fails, use the software fallback.
 155     */
 156    if (!st->pipe->screen->get_param(st->pipe->screen,
 157                                     PIPE_CAP_GENERATE_MIPMAP) ||
 158        !st->pipe->generate_mipmap(st->pipe, pt, format, baseLevel,
 159                                   lastLevel, first_layer, last_layer)) {
 160
 161       if (!util_gen_mipmap(st->pipe, pt, format, baseLevel, lastLevel,
 162                            first_layer, last_layer, PIPE_TEX_FILTER_LINEAR)) {
 163          _mesa_generate_mipmap(ctx, target, texObj);
 164       }
 165    }
 166 }