src/intel/isl/isl_gen6.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_gen6.h"
  25 #include "isl_priv.h"
  26
  27 bool
  28 gen6_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    const struct isl_format_layout *fmtl = isl_format_get_layout(info->format);
  34
  35    assert(ISL_DEV_GEN(dev) == 6);
  36    assert(info->samples >= 1);
  37
  38    if (info->samples == 1) {
  39       *msaa_layout = ISL_MSAA_LAYOUT_NONE;
  40       return false;
  41    }
  42
  43    /* From the Sandybridge PRM, Volume 4 Part 1 p72, SURFACE_STATE, Surface
  44     * Format:
  45     *
  46     *    If Number of Multisamples is set to a value other than
  47     *    MULTISAMPLECOUNT_1, this field cannot be set to the following
  48     *    formats:
  49     *
  50     *       - any format with greater than 64 bits per element
  51     *       - any compressed texture format (BC*)
  52     *       - any YCRCB* format
  53     */
  54    if (fmtl->bs > 8)
  55       return false;
  56    if (isl_format_is_compressed(info->format))
  57       return false;
  58    if (isl_format_is_yuv(info->format))
  59       return false;
  60
  61    /* From the Sandybridge PRM, Volume 4 Part 1 p85, SURFACE_STATE, Number of
  62     * Multisamples:
  63     *
  64     *    If this field is any value other than MULTISAMPLECOUNT_1 the
  65     *    following restrictions apply:
  66     *
  67     *       - the Surface Type must be SURFTYPE_2D
  68     *       - [...]
  69     */
  70    if (info->dim != ISL_SURF_DIM_2D)
  71       return false;
  72
  73    /* More obvious restrictions */
  74    if (isl_surf_usage_is_display(info->usage))
  75       return false;
  76    if (tiling == ISL_TILING_LINEAR)
  77       return false;
  78    if (info->levels > 1)
  79       return false;
  80
  81    *msaa_layout = ISL_MSAA_LAYOUT_INTERLEAVED;
  82    return true;
  83 }
  84
  85 void
  86 gen6_choose_image_alignment_el(const struct isl_device *dev,
  87                                const struct isl_surf_init_info *restrict info,
  88                                enum isl_tiling tiling,
  89                                enum isl_msaa_layout msaa_layout,
  90                                struct isl_extent3d *image_align_el)
  91 {
  92    /* Note that the surface's horizontal image alignment is not programmable
  93     * on Sandybridge.
  94     *
  95     * From the Sandybridge PRM (2011-05), Volume 1, Part 1, Section 7.18.3.4
  96     * Alignment Unit Size:
  97     *
  98     *    Note that the compressed formats are padded to a full compression cell.
  99     *
 100     *    +------------------------+--------+--------+
 101     *    | format                 | halign | valign |
 102     *    +------------------------+--------+--------+
 103     *    | YUV 4:2:2 formats      |      4 |      * |
 104     *    | uncompressed formats   |      4 |      * |
 105     *    +------------------------+--------+--------+
 106     *
 107     *    * For these formats, the vertical alignment factor “j” is determined
 108     *      as follows:
 109     *       - j = 4 for any depth buffer
 110     *       - j = 2 for separate stencil buffer
 111     *       - j = 4 for any render target surface is multisampled (4x)
 112     *       - j = 2 for all other render target surface
 113     *
 114     * From the Sandrybridge PRM (2011-05), Volume 4, Part 1, Section 2.11.2
 115     * SURFACE_STATE, Surface Vertical Alignment:
 116     *
 117     *    - This field must be set to VALIGN_2 if the Surface Format is 96 bits
 118     *      per element (BPE).
 119     *
 120     *    - Value of 1 [VALIGN_4] is not supported for format YCRCB_NORMAL
 121     *      (0x182), YCRCB_SWAPUVY (0x183), YCRCB_SWAPUV (0x18f), YCRCB_SWAPY
 122     *      (0x190)
 123     */
 124
 125    if (isl_format_is_compressed(info->format)) {
 126       *image_align_el = isl_extent3d(1, 1, 1);
 127       return;
 128    }
 129
 130    if (isl_format_is_yuv(info->format)) {
 131       *image_align_el = isl_extent3d(4, 2, 1);
 132       return;
 133    }
 134
 135    if (info->samples > 1) {
 136       *image_align_el = isl_extent3d(4, 4, 1);
 137       return;
 138    }
 139
 140    if (isl_surf_usage_is_depth_or_stencil(info->usage) &&
 141        !ISL_DEV_USE_SEPARATE_STENCIL(dev)) {
 142       /* interleaved depthstencil buffer */
 143       *image_align_el = isl_extent3d(4, 4, 1);
 144       return;
 145    }
 146
 147    if (isl_surf_usage_is_depth(info->usage)) {
 148       /* separate depth buffer */
 149       *image_align_el = isl_extent3d(4, 4, 1);
 150       return;
 151    }
 152
 153    if (isl_surf_usage_is_stencil(info->usage)) {
 154       /* separate stencil buffer */
 155       *image_align_el = isl_extent3d(4, 2, 1);
 156       return;
 157    }
 158
 159    *image_align_el = isl_extent3d(4, 2, 1);
 160 }