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    assert(numLevels >= 1);
  65
  66    return numLevels;
  67 }
  68
  69
  70 /**
  71  * Called via ctx->Driver.GenerateMipmap().
  72  */
  73 void
  74 st_generate_mipmap(struct gl_context *ctx, GLenum target,
  75                    struct gl_texture_object *texObj)
  76 {
  77    struct st_context *st = st_context(ctx);
  78    struct st_texture_object *stObj = st_texture_object(texObj);
  79    struct pipe_resource *pt = st_get_texobj_resource(texObj);
  80    const uint baseLevel = texObj->BaseLevel;
  81    uint lastLevel, first_layer, last_layer;
  82    uint dstLevel;
  83
  84    if (!pt)
  85       return;
  86
  87    /* not sure if this ultimately actually should work,
  88       but we're not supporting multisampled textures yet. */
  89    assert(pt->nr_samples < 2);
  90
  91    /* find expected last mipmap level to generate*/
  92    lastLevel = compute_num_levels(ctx, texObj, target) - 1;
  93
  94    if (lastLevel == 0)
  95       return;
  96
  97    /* The texture isn't in a "complete" state yet so set the expected
  98     * lastLevel here, since it won't get done in st_finalize_texture().
  99     */
 100    stObj->lastLevel = lastLevel;
 101
 102    if (pt->last_level < lastLevel) {
 103       /* The current gallium texture doesn't have space for all the
 104        * mipmap levels we need to generate.  So allocate a new texture.
 105        */
 106       struct pipe_resource *oldTex = stObj->pt;
 107
 108       /* create new texture with space for more levels */
 109       stObj->pt = st_texture_create(st,
 110                                     oldTex->target,
 111                                     oldTex->format,
 112                                     lastLevel,
 113                                     oldTex->width0,
 114                                     oldTex->height0,
 115                                     oldTex->depth0,
 116                                     oldTex->array_size,
 117                                     0,
 118                                     oldTex->bind);
 119
 120       /* This will copy the old texture's base image into the new texture
 121        * which we just allocated.
 122        */
 123       st_finalize_texture(ctx, st->pipe, texObj);
 124
 125       /* release the old tex (will likely be freed too) */
 126       pipe_resource_reference(&oldTex, NULL);
 127       st_texture_release_all_sampler_views(stObj);
 128    }
 129    else {
 130       /* Make sure that the base texture image data is present in the
 131        * texture buffer.
 132        */
 133       st_finalize_texture(ctx, st->pipe, texObj);
 134    }
 135
 136    pt = stObj->pt;
 137
 138    assert(pt->last_level >= lastLevel);
 139
 140    if (pt->target == PIPE_TEXTURE_CUBE) {
 141       first_layer = last_layer = _mesa_tex_target_to_face(target);
 142    }
 143    else {
 144       first_layer = 0;
 145       last_layer = util_max_layer(pt, baseLevel);
 146    }
 147
 148    /* Try to generate the mipmap by rendering/texturing.  If that fails,
 149     * use the software fallback.
 150     */
 151    if (!util_gen_mipmap(st->pipe, pt, pt->format, baseLevel, lastLevel,
 152                         first_layer, last_layer, PIPE_TEX_FILTER_LINEAR)) {
 153       _mesa_generate_mipmap(ctx, target, texObj);
 154    }
 155
 156    /* Fill in the Mesa gl_texture_image fields */
 157    for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {
 158       const uint srcLevel = dstLevel - 1;
 159       const struct gl_texture_image *srcImage
 160          = _mesa_get_tex_image(ctx, texObj, target, srcLevel);
 161       struct gl_texture_image *dstImage;
 162       struct st_texture_image *stImage;
 163       uint border = srcImage->Border;
 164       uint dstWidth, dstHeight, dstDepth;
 165
 166       dstWidth = u_minify(pt->width0, dstLevel);
 167       if (texObj->Target == GL_TEXTURE_1D_ARRAY) {
 168          dstHeight = pt->array_size;
 169       }
 170       else {
 171          dstHeight = u_minify(pt->height0, dstLevel);
 172       }
 173       if (texObj->Target == GL_TEXTURE_2D_ARRAY ||
 174           texObj->Target == GL_TEXTURE_CUBE_MAP_ARRAY) {
 175          dstDepth = pt->array_size;
 176       }
 177       else {
 178          dstDepth = u_minify(pt->depth0, dstLevel);
 179       }
 180
 181       dstImage = _mesa_get_tex_image(ctx, texObj, target, dstLevel);
 182       if (!dstImage) {
 183          _mesa_error(ctx, GL_OUT_OF_MEMORY, "generating mipmaps");
 184          return;
 185       }
 186
 187       /* Free old image data */
 188       ctx->Driver.FreeTextureImageBuffer(ctx, dstImage);
 189
 190       /* initialize new image */
 191       _mesa_init_teximage_fields(ctx, dstImage, dstWidth, dstHeight,
 192                                  dstDepth, border, srcImage->InternalFormat,
 193                                  srcImage->TexFormat);
 194
 195       stImage = st_texture_image(dstImage);
 196
 197       pipe_resource_reference(&stImage->pt, pt);
 198    }
 199 }