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 intel_get_texture_alignment_unit(GLenum internalFormat, GLuint *w, GLuint *h)
  39 {
  40     switch (internalFormat) {
  41     case GL_COMPRESSED_RGB_FXT1_3DFX:
  42     case GL_COMPRESSED_RGBA_FXT1_3DFX:
  43         *w = 8;
  44         *h = 4;
  45         break;
  46
  47     case GL_RGB_S3TC:
  48     case GL_RGB4_S3TC:
  49     case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
  50     case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
  51     case GL_RGBA_S3TC:
  52     case GL_RGBA4_S3TC:
  53     case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
  54     case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
  55         *w = 4;
  56         *h = 4;
  57         break;
  58
  59     default:
  60         *w = 4;
  61         *h = 2;
  62         break;
  63     }
  64 }
  65
  66 void i945_miptree_layout_2d( struct intel_context *intel,
  67                              struct intel_mipmap_tree *mt,
  68                              uint32_t tiling )
  69 {
  70    GLuint align_h = 2, align_w = 4;
  71    GLuint level;
  72    GLuint x = 0;
  73    GLuint y = 0;
  74    GLuint width = mt->width0;
  75    GLuint height = mt->height0;
  76
  77    mt->total_width = mt->width0;
  78    intel_get_texture_alignment_unit(mt->internal_format, &align_w, &align_h);
  79
  80    if (mt->compressed) {
  81        mt->total_width = ALIGN(mt->width0, align_w);
  82    }
  83
  84    /* May need to adjust width to accomodate the placement of
  85     * the 2nd mipmap.  This occurs when the alignment
  86     * constraints of mipmap placement push the right edge of the
  87     * 2nd mipmap out past the width of its parent.
  88     */
  89    if (mt->first_level != mt->last_level) {
  90        GLuint mip1_width;
  91
  92        if (mt->compressed) {
  93            mip1_width = ALIGN(minify(mt->width0), align_w)
  94                + ALIGN(minify(minify(mt->width0)), align_w);
  95        } else {
  96            mip1_width = ALIGN(minify(mt->width0), align_w)
  97                + minify(minify(mt->width0));
  98        }
  99
 100        if (mip1_width > mt->total_width) {
 101            mt->total_width = mip1_width;
 102        }
 103    }
 104
 105    mt->total_height = 0;
 106
 107    for ( level = mt->first_level ; level <= mt->last_level ; level++ ) {
 108       GLuint img_height;
 109
 110       intel_miptree_set_level_info(mt, level, 1, x, y, width,
 111                                    height, 1);
 112
 113       if (mt->compressed)
 114          img_height = MAX2(1, height/4);
 115       else
 116          img_height = ALIGN(height, align_h);
 117
 118
 119       /* Because the images are packed better, the final offset
 120        * might not be the maximal one:
 121        */
 122       mt->total_height = MAX2(mt->total_height, y + img_height);
 123
 124       /* Layout_below: step right after second mipmap.
 125        */
 126       if (level == mt->first_level + 1) {
 127          x += ALIGN(width, align_w);
 128       }
 129       else {
 130          y += img_height;
 131       }
 132
 133       width  = minify(width);
 134       height = minify(height);
 135    }
 136 }