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 GLuint intel_compressed_alignment(GLenum internalFormat)
  39 {
  40     GLuint alignment = 4;
  41
  42     switch (internalFormat) {
  43     case GL_COMPRESSED_RGB_FXT1_3DFX:
  44     case GL_COMPRESSED_RGBA_FXT1_3DFX:
  45         alignment = 8;
  46         break;
  47
  48     default:
  49         break;
  50     }
  51
  52     return alignment;
  53 }
  54
  55 void i945_miptree_layout_2d( struct intel_context *intel,
  56                              struct intel_mipmap_tree *mt,
  57                              uint32_t tiling )
  58 {
  59    GLint align_h = 2, align_w = 4;
  60    GLuint level;
  61    GLuint x = 0;
  62    GLuint y = 0;
  63    GLuint width = mt->width0;
  64    GLuint height = mt->height0;
  65
  66    mt->pitch = mt->width0;
  67
  68    if (mt->compressed) {
  69        align_w = intel_compressed_alignment(mt->internal_format);
  70        mt->pitch = ALIGN(mt->width0, align_w);
  71    }
  72
  73    /* May need to adjust pitch to accomodate the placement of
  74     * the 2nd mipmap.  This occurs when the alignment
  75     * constraints of mipmap placement push the right edge of the
  76     * 2nd mipmap out past the width of its parent.
  77     */
  78    if (mt->first_level != mt->last_level) {
  79        GLuint mip1_width;
  80
  81        if (mt->compressed) {
  82            mip1_width = ALIGN(minify(mt->width0), align_w)
  83                + ALIGN(minify(minify(mt->width0)), align_w);
  84        } else {
  85            mip1_width = ALIGN(minify(mt->width0), align_w)
  86                + minify(minify(mt->width0));
  87        }
  88
  89        if (mip1_width > mt->pitch) {
  90            mt->pitch = mip1_width;
  91        }
  92    }
  93
  94    /* Pitch must be a whole number of dwords, even though we
  95     * express it in texels.
  96     */
  97    mt->pitch = intel_miptree_pitch_align (intel, mt, tiling, mt->pitch);
  98    mt->total_height = 0;
  99
 100    for ( level = mt->first_level ; level <= mt->last_level ; level++ ) {
 101       GLuint img_height;
 102
 103       intel_miptree_set_level_info(mt, level, 1, x, y, width,
 104                                    height, 1);
 105
 106       if (mt->compressed)
 107          img_height = MAX2(1, height/4);
 108       else
 109          img_height = ALIGN(height, align_h);
 110
 111
 112       /* Because the images are packed better, the final offset
 113        * might not be the maximal one:
 114        */
 115       mt->total_height = MAX2(mt->total_height, y + img_height);
 116
 117       /* Layout_below: step right after second mipmap.
 118        */
 119       if (level == mt->first_level + 1) {
 120          x += ALIGN(width, align_w);
 121       }
 122       else {
 123          y += img_height;
 124       }
 125
 126       width  = minify(width);
 127       height = minify(height);
 128    }
 129 }