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 <keith@tungstengraphics.com>
  31   */
  32
  33 #include "intel_mipmap_tree.h"
  34 #include "intel_tex_layout.h"
  35 #include "macros.h"
  36
  37
  38 void i945_miptree_layout_2d( struct intel_mipmap_tree *mt )
  39 {
  40    GLint align_h = 2;
  41    GLuint level;
  42    GLuint x = 0;
  43    GLuint y = 0;
  44    GLuint width = mt->width0;
  45    GLuint height = mt->height0;
  46
  47    mt->pitch = ((mt->width0 * mt->cpp + 3) & ~3) / mt->cpp;
  48    mt->total_height = 0;
  49
  50    for ( level = mt->first_level ; level <= mt->last_level ; level++ ) {
  51       GLuint img_height;
  52
  53       intel_miptree_set_level_info(mt, level, 1, x, y, width,
  54                                    mt->compressed ? height/4 : height, 1);
  55
  56       if (mt->compressed)
  57          img_height = MAX2(1, height/4);
  58       else
  59          img_height = MAX2(align_h, height);
  60
  61
  62       /* Because the images are packed better, the final offset
  63        * might not be the maximal one:
  64        */
  65       mt->total_height = MAX2(mt->total_height, y + img_height);
  66
  67       /* Layout_below: step right after second mipmap.
  68        */
  69       if (level == mt->first_level + 1) {
  70          x += mt->pitch / 2;
  71          x = (x + 3) & ~ 3;
  72       }
  73       else {
  74          y += img_height;
  75          y += align_h - 1;
  76          y &= ~(align_h - 1);
  77       }
  78
  79       width  = minify(width);
  80       height = minify(height);
  81    }
  82 }