src/intel/isl/isl_gen4.c

   1 /*
   2  * Copyright 2015 Intel Corporation
   3  *
   4  *  Permission is hereby granted, free of charge, to any person obtaining a
   5  *  copy of this software and associated documentation files (the "Software"),
   6  *  to deal in the Software without restriction, including without limitation
   7  *  the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  *  and/or sell copies of the Software, and to permit persons to whom the
   9  *  Software is furnished to do so, subject to the following conditions:
  10  *
  11  *  The above copyright notice and this permission notice (including the next
  12  *  paragraph) shall be included in all copies or substantial portions of the
  13  *  Software.
  14  *
  15  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  *  IN THE SOFTWARE.
  22  */
  23
  24 #include "isl_gen4.h"
  25 #include "isl_priv.h"
  26
  27 bool
  28 gen4_choose_msaa_layout(const struct isl_device *dev,
  29                         const struct isl_surf_init_info *info,
  30                         enum isl_tiling tiling,
  31                         enum isl_msaa_layout *msaa_layout)
  32 {
  33    /* Gen4 and Gen5 do not support MSAA */
  34    assert(info->samples >= 1);
  35
  36    *msaa_layout = ISL_MSAA_LAYOUT_NONE;
  37    return true;
  38 }
  39
  40 void
  41 gen4_choose_image_alignment_el(const struct isl_device *dev,
  42                                const struct isl_surf_init_info *restrict info,
  43                                enum isl_tiling tiling,
  44                                enum isl_dim_layout dim_layout,
  45                                enum isl_msaa_layout msaa_layout,
  46                                struct isl_extent3d *image_align_el)
  47 {
  48    assert(info->samples == 1);
  49    assert(msaa_layout == ISL_MSAA_LAYOUT_NONE);
  50    assert(!isl_tiling_is_std_y(tiling));
  51
  52    /* Note that neither the surface's horizontal nor vertical image alignment
  53     * is programmable on gen4 nor gen5.
  54     *
  55     * From the G35 PRM (2008-01), Volume 1 Graphics Core, Section 6.17.3.4
  56     * Alignment Unit Size:
  57     *
  58     *    Note that the compressed formats are padded to a full compression
  59     *    cell.
  60     *
  61     *    +------------------------+--------+--------+
  62     *    | format                 | halign | valign |
  63     *    +------------------------+--------+--------+
  64     *    | YUV 4:2:2 formats      |      4 |      2 |
  65     *    | uncompressed formats   |      4 |      2 |
  66     *    +------------------------+--------+--------+
  67     */
  68
  69    if (isl_format_is_compressed(info->format)) {
  70       *image_align_el = isl_extent3d(1, 1, 1);
  71       return;
  72    }
  73
  74    *image_align_el = isl_extent3d(4, 2, 1);
  75 }