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
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  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/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    uint dstLevel;
  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    /* The texture isn't in a "complete" state yet so set the expected
 101     * lastLevel here, since it won't get done in st_finalize_texture().
 102     */
 103    stObj->lastLevel = lastLevel;
 104
 105    if (!texObj->Immutable) {
 106       if (pt->last_level < lastLevel) {
 107          /* The current gallium texture doesn't have space for all the
 108          * mipmap levels we need to generate.  So allocate a new texture.
 109          */
 110          struct pipe_resource *oldTex = stObj->pt;
 111
 112          /* create new texture with space for more levels */
 113          stObj->pt = st_texture_create(st,
 114                                        oldTex->target,
 115                                        oldTex->format,
 116                                        lastLevel,
 117                                        oldTex->width0,
 118                                        oldTex->height0,
 119                                        oldTex->depth0,
 120                                        oldTex->array_size,
 121                                        0,
 122                                        oldTex->bind);
 123
 124          /* This will copy the old texture's base image into the new texture
 125          * which we just allocated.
 126          */
 127          st_finalize_texture(ctx, st->pipe, texObj);
 128
 129          /* release the old tex (will likely be freed too) */
 130          pipe_resource_reference(&oldTex, NULL);
 131          st_texture_release_all_sampler_views(st, stObj);
 132       }
 133       else {
 134          /* Make sure that the base texture image data is present in the
 135          * texture buffer.
 136          */
 137          st_finalize_texture(ctx, st->pipe, texObj);
 138       }
 139    }
 140
 141    pt = stObj->pt;
 142
 143    assert(pt->last_level >= lastLevel);
 144
 145    if (pt->target == PIPE_TEXTURE_CUBE) {
 146       first_layer = last_layer = _mesa_tex_target_to_face(target);
 147    }
 148    else {
 149       first_layer = 0;
 150       last_layer = util_max_layer(pt, baseLevel);
 151    }
 152
 153    if (stObj->surface_based)
 154       format = stObj->surface_format;
 155    else
 156       format = pt->format;
 157
 158    /* First see if the driver supports hardware mipmap generation,
 159     * if not then generate the mipmap by rendering/texturing.
 160     * If that fails, use the software fallback.
 161     */
 162    if (!st->pipe->screen->get_param(st->pipe->screen,
 163                                     PIPE_CAP_GENERATE_MIPMAP) ||
 164        !st->pipe->generate_mipmap(st->pipe, pt, format, baseLevel,
 165                                   lastLevel, first_layer, last_layer)) {
 166
 167       if (!util_gen_mipmap(st->pipe, pt, format, baseLevel, lastLevel,
 168                            first_layer, last_layer, PIPE_TEX_FILTER_LINEAR)) {
 169          _mesa_generate_mipmap(ctx, target, texObj);
 170       }
 171    }
 172
 173    /* Fill in the Mesa gl_texture_image fields */
 174    for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {
 175       const uint srcLevel = dstLevel - 1;
 176       const struct gl_texture_image *srcImage
 177          = _mesa_get_tex_image(ctx, texObj, target, srcLevel);
 178       struct gl_texture_image *dstImage;
 179       struct st_texture_image *stImage;
 180       uint border = srcImage->Border;
 181       uint dstWidth, dstHeight, dstDepth;
 182
 183       dstWidth = u_minify(pt->width0, dstLevel);
 184       if (texObj->Target == GL_TEXTURE_1D_ARRAY) {
 185          dstHeight = pt->array_size;
 186       }
 187       else {
 188          dstHeight = u_minify(pt->height0, dstLevel);
 189       }
 190       if (texObj->Target == GL_TEXTURE_2D_ARRAY ||
 191           texObj->Target == GL_TEXTURE_CUBE_MAP_ARRAY) {
 192          dstDepth = pt->array_size;
 193       }
 194       else {
 195          dstDepth = u_minify(pt->depth0, dstLevel);
 196       }
 197
 198       dstImage = _mesa_get_tex_image(ctx, texObj, target, dstLevel);
 199       if (!dstImage) {
 200          _mesa_error(ctx, GL_OUT_OF_MEMORY, "generating mipmaps");
 201          return;
 202       }
 203
 204       /* Free old image data */
 205       ctx->Driver.FreeTextureImageBuffer(ctx, dstImage);
 206
 207       /* initialize new image */
 208       _mesa_init_teximage_fields(ctx, dstImage, dstWidth, dstHeight,
 209                                  dstDepth, border, srcImage->InternalFormat,
 210                                  srcImage->TexFormat);
 211
 212       stImage = st_texture_image(dstImage);
 213
 214       pipe_resource_reference(&stImage->pt, pt);
 215    }
 216 }