src/mesa/drivers/dri/i965/brw_tex_layout.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a 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, sublicense, 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
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   */
  31
  32
  33 /* Code to layout images in a mipmap tree for i965.
  34  */
  35
  36 #include "intel_mipmap_tree.h"
  37 #include "macros.h"
  38
  39 static GLuint minify( GLuint d )
  40 {
  41    return MAX2(1, d>>1);
  42 }
  43
  44
  45 GLboolean brw_miptree_layout( struct intel_mipmap_tree *mt )
  46 {
  47    /* XXX: these vary depending on image format:
  48     */
  49 /*    GLint align_w = 4; */
  50    GLint align_h = 2;
  51
  52
  53    switch (mt->target) {
  54    case GL_TEXTURE_CUBE_MAP:
  55    case GL_TEXTURE_3D: {
  56       GLuint width  = mt->width0;
  57       GLuint height = mt->height0;
  58       GLuint depth = mt->depth0;
  59       GLuint pack_x_pitch, pack_x_nr;
  60       GLuint pack_y_pitch;
  61       GLuint level;
  62
  63       mt->pitch = ((mt->width0 * mt->cpp + 3) & ~3) / mt->cpp;
  64       mt->total_height = 0;
  65
  66       pack_y_pitch = MAX2(mt->height0, 2);
  67       pack_x_pitch = mt->pitch;
  68       pack_x_nr = 1;
  69
  70       for ( level = mt->first_level ; level <= mt->last_level ; level++ ) {
  71          GLuint nr_images = mt->target == GL_TEXTURE_3D ? depth : 6;
  72          GLint x = 0;
  73          GLint y = 0;
  74          GLint q, j;
  75
  76          intel_miptree_set_level_info(mt, level, nr_images,
  77                                       0, mt->total_height,
  78                                       width, height, depth);
  79
  80          for (q = 0; q < nr_images;) {
  81             for (j = 0; j < pack_x_nr && q < nr_images; j++, q++) {
  82                intel_miptree_set_image_offset(mt, level, q, x, y);
  83                x += pack_x_pitch;
  84             }
  85
  86             x = 0;
  87             y += pack_y_pitch;
  88          }
  89
  90
  91          mt->total_height += y;
  92
  93          if (pack_x_pitch > 4) {
  94             pack_x_pitch >>= 1;
  95             pack_x_nr <<= 1;
  96             assert(pack_x_pitch * pack_x_nr <= mt->pitch);
  97          }
  98
  99          if (pack_y_pitch > 2) {
 100             pack_y_pitch >>= 1;
 101          }
 102
 103          width  = minify(width);
 104          height = minify(height);
 105          depth  = minify(depth);
 106       }
 107       break;
 108    }
 109
 110    default: {
 111       GLuint level;
 112       GLuint x = 0;
 113       GLuint y = 0;
 114       GLuint width = mt->width0;
 115       GLuint height = mt->height0;
 116
 117       mt->pitch = ((mt->width0 * mt->cpp + 3) & ~3) / mt->cpp;
 118       mt->total_height = 0;
 119
 120       for ( level = mt->first_level ; level <= mt->last_level ; level++ ) {
 121          GLuint img_height;
 122
 123          intel_miptree_set_level_info(mt, level, 1,
 124                                       x, y,
 125                                       width,
 126                                       mt->compressed ? height/4 : height, 1);
 127
 128          if (mt->compressed)
 129             img_height = MAX2(1, height/4);
 130          else
 131             img_height = MAX2(align_h, height);
 132
 133
 134          /* Because the images are packed better, the final offset
 135           * might not be the maximal one:
 136           */
 137          mt->total_height = MAX2(mt->total_height, y + img_height);
 138
 139          /* Layout_below: step right after second mipmap.
 140           */
 141          if (level == mt->first_level + 1)
 142             x += mt->pitch / 2;
 143          else {
 144             y += img_height;
 145          }
 146
 147
 148          width  = minify(width);
 149          height = minify(height);
 150       }
 151       break;
 152    }
 153    }
 154    DBG("%s: %dx%dx%d - sz 0x%x\n", __FUNCTION__,
 155                 mt->pitch,
 156                 mt->total_height,
 157                 mt->cpp,
 158                 mt->pitch * mt->total_height * mt->cpp );
 159
 160    return GL_TRUE;
 161 }
 162