src/mesa/state_tracker/st_gen_mipmap.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 VMware, Inc.
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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    uint lastLevel, first_layer, last_layer;
  84    uint dstLevel;
  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       if (pt->last_level < lastLevel) {
 106          /* The current gallium texture doesn't have space for all the
 107          * mipmap levels we need to generate.  So allocate a new texture.
 108          */
 109          struct pipe_resource *oldTex = stObj->pt;
 110
 111          /* create new texture with space for more levels */
 112          stObj->pt = st_texture_create(st,
 113                                        oldTex->target,
 114                                        oldTex->format,
 115                                        lastLevel,
 116                                        oldTex->width0,
 117                                        oldTex->height0,
 118                                        oldTex->depth0,
 119                                        oldTex->array_size,
 120                                        0,
 121                                        oldTex->bind);
 122
 123          /* This will copy the old texture's base image into the new texture
 124          * which we just allocated.
 125          */
 126          st_finalize_texture(ctx, st->pipe, texObj);
 127
 128          /* release the old tex (will likely be freed too) */
 129          pipe_resource_reference(&oldTex, NULL);
 130          st_texture_release_all_sampler_views(st, stObj);
 131       }
 132       else {
 133          /* Make sure that the base texture image data is present in the
 134          * texture buffer.
 135          */
 136          st_finalize_texture(ctx, st->pipe, texObj);
 137       }
 138    }
 139
 140    pt = stObj->pt;
 141
 142    assert(pt->last_level >= lastLevel);
 143
 144    if (pt->target == PIPE_TEXTURE_CUBE) {
 145       first_layer = last_layer = _mesa_tex_target_to_face(target);
 146    }
 147    else {
 148       first_layer = 0;
 149       last_layer = util_max_layer(pt, baseLevel);
 150    }
 151
 152    /* Try to generate the mipmap by rendering/texturing.  If that fails,
 153     * use the software fallback.
 154     */
 155    if (!util_gen_mipmap(st->pipe, pt, pt->format, baseLevel, lastLevel,
 156                         first_layer, last_layer, PIPE_TEX_FILTER_LINEAR)) {
 157       _mesa_generate_mipmap(ctx, target, texObj);
 158    }
 159
 160    /* Fill in the Mesa gl_texture_image fields */
 161    for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {
 162       const uint srcLevel = dstLevel - 1;
 163       const struct gl_texture_image *srcImage
 164          = _mesa_get_tex_image(ctx, texObj, target, srcLevel);
 165       struct gl_texture_image *dstImage;
 166       struct st_texture_image *stImage;
 167       uint border = srcImage->Border;
 168       uint dstWidth, dstHeight, dstDepth;
 169
 170       dstWidth = u_minify(pt->width0, dstLevel);
 171       if (texObj->Target == GL_TEXTURE_1D_ARRAY) {
 172          dstHeight = pt->array_size;
 173       }
 174       else {
 175          dstHeight = u_minify(pt->height0, dstLevel);
 176       }
 177       if (texObj->Target == GL_TEXTURE_2D_ARRAY ||
 178           texObj->Target == GL_TEXTURE_CUBE_MAP_ARRAY) {
 179          dstDepth = pt->array_size;
 180       }
 181       else {
 182          dstDepth = u_minify(pt->depth0, dstLevel);
 183       }
 184
 185       dstImage = _mesa_get_tex_image(ctx, texObj, target, dstLevel);
 186       if (!dstImage) {
 187          _mesa_error(ctx, GL_OUT_OF_MEMORY, "generating mipmaps");
 188          return;
 189       }
 190
 191       /* Free old image data */
 192       ctx->Driver.FreeTextureImageBuffer(ctx, dstImage);
 193
 194       /* initialize new image */
 195       _mesa_init_teximage_fields(ctx, dstImage, dstWidth, dstHeight,
 196                                  dstDepth, border, srcImage->InternalFormat,
 197                                  srcImage->TexFormat);
 198
 199       stImage = st_texture_image(dstImage);
 200
 201       pipe_resource_reference(&stImage->pt, pt);
 202    }
 203 }