src/mesa/drivers/dri/intel/intel_tex_layout.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2006 Tungsten Graphics, Inc., Cedar Park, Texas.
   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 TUNGSTEN GRAPHICS 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   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   *   Michel Dänzer <michel@tungstengraphics.com>
  31   */
  32
  33 #include "intel_mipmap_tree.h"
  34 #include "intel_tex_layout.h"
  35 #include "intel_context.h"
  36 #include "main/macros.h"
  37
  38 void
  39 intel_get_texture_alignment_unit(gl_format format,
  40                                  unsigned int *w, unsigned int *h)
  41 {
  42    if (_mesa_is_format_compressed(format)) {
  43       /* The hardware alignment requirements for compressed textures
  44        * happen to match the block boundaries.
  45        */
  46       _mesa_get_format_block_size(format, w, h);
  47    } else {
  48       *w = 4;
  49       *h = 2;
  50    }
  51 }
  52
  53 void i945_miptree_layout_2d(struct intel_mipmap_tree *mt, int nr_images)
  54 {
  55    GLuint align_h, align_w;
  56    GLuint level;
  57    GLuint x = 0;
  58    GLuint y = 0;
  59    GLuint width = mt->width0;
  60    GLuint height = mt->height0;
  61
  62    mt->total_width = mt->width0;
  63    intel_get_texture_alignment_unit(mt->format, &align_w, &align_h);
  64
  65    if (mt->compressed) {
  66        mt->total_width = ALIGN(mt->width0, align_w);
  67    }
  68
  69    /* May need to adjust width to accomodate the placement of
  70     * the 2nd mipmap.  This occurs when the alignment
  71     * constraints of mipmap placement push the right edge of the
  72     * 2nd mipmap out past the width of its parent.
  73     */
  74    if (mt->first_level != mt->last_level) {
  75        GLuint mip1_width;
  76
  77        if (mt->compressed) {
  78            mip1_width = ALIGN(minify(mt->width0), align_w)
  79                + ALIGN(minify(minify(mt->width0)), align_w);
  80        } else {
  81            mip1_width = ALIGN(minify(mt->width0), align_w)
  82                + minify(minify(mt->width0));
  83        }
  84
  85        if (mip1_width > mt->total_width) {
  86            mt->total_width = mip1_width;
  87        }
  88    }
  89
  90    mt->total_height = 0;
  91
  92    for ( level = mt->first_level ; level <= mt->last_level ; level++ ) {
  93       GLuint img_height;
  94
  95       intel_miptree_set_level_info(mt, level, nr_images, x, y, width,
  96                                    height, 1);
  97
  98       img_height = ALIGN(height, align_h);
  99       if (mt->compressed)
 100          img_height /= align_h;
 101
 102       /* Because the images are packed better, the final offset
 103        * might not be the maximal one:
 104        */
 105       mt->total_height = MAX2(mt->total_height, y + img_height);
 106
 107       /* Layout_below: step right after second mipmap.
 108        */
 109       if (level == mt->first_level + 1) {
 110          x += ALIGN(width, align_w);
 111       }
 112       else {
 113          y += img_height;
 114       }
 115
 116       width  = minify(width);
 117       height = minify(height);
 118    }
 119 }