src/mesa/state_tracker/st_gen_mipmap.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 VMware, Inc.
   4  * All Rights Reserved.
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   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
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  13  *
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  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.
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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_texture.h"
  44
  45
  46 /**
  47  * Compute the expected number of mipmap levels in the texture given
  48  * the width/height/depth of the base image and the GL_TEXTURE_BASE_LEVEL/
  49  * GL_TEXTURE_MAX_LEVEL settings.  This will tell us how many mipmap
  50  * levels should be generated.
  51  */
  52 static GLuint
  53 compute_num_levels(struct gl_context *ctx,
  54                    struct gl_texture_object *texObj,
  55                    GLenum target)
  56 {
  57    const struct gl_texture_image *baseImage;
  58    GLuint numLevels;
  59
  60    baseImage = _mesa_get_tex_image(ctx, texObj, target, texObj->BaseLevel);
  61
  62    numLevels = texObj->BaseLevel + baseImage->MaxNumLevels;
  63    numLevels = MIN2(numLevels, (GLuint) texObj->MaxLevel + 1);
  64    if (texObj->Immutable)
  65       numLevels = MIN2(numLevels, texObj->NumLevels);
  66    assert(numLevels >= 1);
  67
  68    return numLevels;
  69 }
  70
  71
  72 /**
  73  * Called via ctx->Driver.GenerateMipmap().
  74  */
  75 void
  76 st_generate_mipmap(struct gl_context *ctx, GLenum target,
  77                    struct gl_texture_object *texObj)
  78 {
  79    struct st_context *st = st_context(ctx);
  80    struct st_texture_object *stObj = st_texture_object(texObj);
  81    struct pipe_resource *pt = st_get_texobj_resource(texObj);
  82    const uint baseLevel = texObj->BaseLevel;
  83    enum pipe_format format;
  84    uint lastLevel, first_layer, last_layer;
  85
  86    if (!pt)
  87       return;
  88
  89    /* not sure if this ultimately actually should work,
  90       but we're not supporting multisampled textures yet. */
  91    assert(pt->nr_samples < 2);
  92
  93    /* find expected last mipmap level to generate*/
  94    lastLevel = compute_num_levels(ctx, texObj, target) - 1;
  95
  96    if (lastLevel == 0)
  97       return;
  98
  99    /* The texture isn't in a "complete" state yet so set the expected
 100     * lastLevel here, since it won't get done in st_finalize_texture().
 101     */
 102    stObj->lastLevel = lastLevel;
 103
 104    if (!texObj->Immutable) {
 105       const GLboolean genSave = texObj->GenerateMipmap;
 106
 107       /* Temporarily set GenerateMipmap to true so that allocate_full_mipmap()
 108        * makes the right decision about full mipmap allocation.
 109        */
 110       texObj->GenerateMipmap = GL_TRUE;
 111
 112       _mesa_prepare_mipmap_levels(ctx, texObj, baseLevel, lastLevel);
 113
 114       texObj->GenerateMipmap = genSave;
 115
 116       /* At this point, memory for all the texture levels has been
 117        * allocated.  However, the base level image may be in one resource
 118        * while the subsequent/smaller levels may be in another resource.
 119        * Finalizing the texture will copy the base images from the former
 120        * resource to the latter.
 121        *
 122        * After this, we'll have all mipmap levels in one resource.
 123        */
 124       st_finalize_texture(ctx, st->pipe, texObj);
 125    }
 126
 127    pt = stObj->pt;
 128    if (!pt) {
 129       _mesa_error(ctx, GL_OUT_OF_MEMORY, "mipmap generation");
 130       return;
 131    }
 132
 133    assert(pt->last_level >= lastLevel);
 134
 135    if (pt->target == PIPE_TEXTURE_CUBE) {
 136       first_layer = last_layer = _mesa_tex_target_to_face(target);
 137    }
 138    else {
 139       first_layer = 0;
 140       last_layer = util_max_layer(pt, baseLevel);
 141    }
 142
 143    if (stObj->surface_based)
 144       format = stObj->surface_format;
 145    else
 146       format = pt->format;
 147
 148    /* First see if the driver supports hardware mipmap generation,
 149     * if not then generate the mipmap by rendering/texturing.
 150     * If that fails, use the software fallback.
 151     */
 152    if (!st->pipe->screen->get_param(st->pipe->screen,
 153                                     PIPE_CAP_GENERATE_MIPMAP) ||
 154        !st->pipe->generate_mipmap(st->pipe, pt, format, baseLevel,
 155                                   lastLevel, first_layer, last_layer)) {
 156
 157       if (!util_gen_mipmap(st->pipe, pt, format, baseLevel, lastLevel,
 158                            first_layer, last_layer, PIPE_TEX_FILTER_LINEAR)) {
 159          _mesa_generate_mipmap(ctx, target, texObj);
 160       }
 161    }
 162 }