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 /* Code to layout images in a mipmap tree for i965.
  33  */
  34
  35 #include "intel_mipmap_tree.h"
  36 #include "intel_tex_layout.h"
  37 #include "intel_context.h"
  38 #include "main/macros.h"
  39
  40 #define FILE_DEBUG_FLAG DEBUG_MIPTREE
  41
  42 GLboolean brw_miptree_layout(struct intel_context *intel,
  43                              struct intel_mipmap_tree *mt,
  44                              uint32_t tiling)
  45 {
  46    /* XXX: these vary depending on image format: */
  47    /* GLint align_w = 4; */
  48
  49    switch (mt->target) {
  50    case GL_TEXTURE_CUBE_MAP:
  51    case GL_TEXTURE_3D: {
  52       GLuint width  = mt->width0;
  53       GLuint height = mt->height0;
  54       GLuint depth = mt->depth0;
  55       GLuint pack_x_pitch, pack_x_nr;
  56       GLuint pack_y_pitch;
  57       GLuint level;
  58       GLuint align_h = 2;
  59       GLuint align_w = 4;
  60
  61       mt->total_height = 0;
  62
  63       if (mt->compressed) {
  64           align_w = intel_compressed_alignment(mt->internal_format);
  65           mt->pitch = ALIGN(width, align_w);
  66           pack_y_pitch = (height + 3) / 4;
  67       } else {
  68          mt->pitch = intel_miptree_pitch_align (intel, mt, tiling, mt->width0);
  69          pack_y_pitch = ALIGN(mt->height0, align_h);
  70       }
  71
  72       pack_x_pitch = width;
  73       pack_x_nr = 1;
  74
  75       for (level = mt->first_level ; level <= mt->last_level ; level++) {
  76          GLuint nr_images = mt->target == GL_TEXTURE_3D ? depth : 6;
  77          GLint x = 0;
  78          GLint y = 0;
  79          GLint q, j;
  80
  81          intel_miptree_set_level_info(mt, level, nr_images,
  82                                       0, mt->total_height,
  83                                       width, height, depth);
  84
  85          for (q = 0; q < nr_images;) {
  86             for (j = 0; j < pack_x_nr && q < nr_images; j++, q++) {
  87                intel_miptree_set_image_offset(mt, level, q, x, y);
  88                x += pack_x_pitch;
  89             }
  90
  91             x = 0;
  92             y += pack_y_pitch;
  93          }
  94
  95
  96          mt->total_height += y;
  97          width  = minify(width);
  98          height = minify(height);
  99          depth  = minify(depth);
 100
 101          if (mt->compressed) {
 102             pack_y_pitch = (height + 3) / 4;
 103
 104             if (pack_x_pitch > ALIGN(width, align_w)) {
 105                pack_x_pitch = ALIGN(width, align_w);
 106                pack_x_nr <<= 1;
 107             }
 108          } else {
 109             if (pack_x_pitch > 4) {
 110                pack_x_pitch >>= 1;
 111                pack_x_nr <<= 1;
 112                assert(pack_x_pitch * pack_x_nr <= mt->pitch);
 113             }
 114
 115             if (pack_y_pitch > 2) {
 116                pack_y_pitch >>= 1;
 117                pack_y_pitch = ALIGN(pack_y_pitch, align_h);
 118             }
 119          }
 120
 121       }
 122       break;
 123    }
 124
 125    default:
 126       i945_miptree_layout_2d(intel, mt, tiling);
 127       break;
 128    }
 129    DBG("%s: %dx%dx%d - sz 0x%x\n", __FUNCTION__,
 130                 mt->pitch,
 131                 mt->total_height,
 132                 mt->cpp,
 133                 mt->pitch * mt->total_height * mt->cpp );
 134
 135    return GL_TRUE;
 136 }
 137