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      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 isl_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 isl_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 }
     76