src/gallium/drivers/i965/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_tex_layout.h"
  34
  35 void intel_get_texture_alignment_unit(GLenum internalFormat, GLuint *w, GLuint *h)
  36 {
  37     switch (internalFormat) {
  38     case GL_COMPRESSED_RGB_FXT1_3DFX:
  39     case GL_COMPRESSED_RGBA_FXT1_3DFX:
  40         *w = 8;
  41         *h = 4;
  42         break;
  43
  44     case GL_RGB_S3TC:
  45     case GL_RGB4_S3TC:
  46     case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
  47     case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
  48     case GL_RGBA_S3TC:
  49     case GL_RGBA4_S3TC:
  50     case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
  51     case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
  52         *w = 4;
  53         *h = 4;
  54         break;
  55
  56     default:
  57         *w = 4;
  58         *h = 2;
  59         break;
  60     }
  61 }
  62
  63 void i945_miptree_layout_2d( struct intel_context *intel,
  64                              struct intel_mipmap_tree *mt,
  65                              uint32_t tiling )
  66 {
  67    GLuint align_h = 2, align_w = 4;
  68    GLuint level;
  69    GLuint x = 0;
  70    GLuint y = 0;
  71    GLuint width = mt->width0;
  72    GLuint height = mt->height0;
  73
  74    mt->pitch = mt->width0;
  75    intel_get_texture_alignment_unit(mt->internal_format, &align_w, &align_h);
  76
  77    if (mt->compressed) {
  78        mt->pitch = ALIGN(mt->width0, align_w);
  79    }
  80
  81    /* May need to adjust pitch to accomodate the placement of
  82     * the 2nd mipmap.  This occurs when the alignment
  83     * constraints of mipmap placement push the right edge of the
  84     * 2nd mipmap out past the width of its parent.
  85     */
  86    if (mt->last_level) {
  87        GLuint mip1_width;
  88
  89        if (mt->compressed) {
  90            mip1_width = ALIGN(minify(mt->width0), align_w)
  91                + ALIGN(minify(minify(mt->width0)), align_w);
  92        } else {
  93            mip1_width = ALIGN(minify(mt->width0), align_w)
  94                + minify(minify(mt->width0));
  95        }
  96
  97        if (mip1_width > mt->pitch) {
  98            mt->pitch = mip1_width;
  99        }
 100    }
 101
 102    /* Pitch must be a whole number of dwords, even though we
 103     * express it in texels.
 104     */
 105    mt->pitch = intel_miptree_pitch_align (intel, mt, tiling, mt->pitch);
 106    mt->total_height = 0;
 107
 108    for ( level = 0 ; level <= mt->last_level ; level++ ) {
 109       GLuint img_height;
 110
 111       intel_miptree_set_level_info(mt, level, 1, x, y, width,
 112                                    height, 1);
 113
 114       if (mt->compressed)
 115          img_height = MAX2(1, height/4);
 116       else
 117          img_height = ALIGN(height, align_h);
 118
 119
 120       /* Because the images are packed better, the final offset
 121        * might not be the maximal one:
 122        */
 123       mt->total_height = MAX2(mt->total_height, y + img_height);
 124
 125       /* Layout_below: step right after second mipmap.
 126        */
 127       if (level == 1) {
 128          x += ALIGN(width, align_w);
 129       }
 130       else {
 131          y += img_height;
 132       }
 133
 134       width  = minify(width);
 135       height = minify(height);
 136    }
 137 }