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/*
* Copyright 2015 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "isl_gen6.h"
#include "isl_priv.h"
bool
isl_gen6_choose_msaa_layout(const struct isl_device *dev,
const struct isl_surf_init_info *info,
enum isl_tiling tiling,
enum isl_msaa_layout *msaa_layout)
{
assert(ISL_DEV_GEN(dev) == 6);
assert(info->samples >= 1);
if (info->samples == 1) {
*msaa_layout = ISL_MSAA_LAYOUT_NONE;
return true;
}
if (!isl_format_supports_multisampling(dev->info, info->format))
return false;
/* From the Sandybridge PRM, Volume 4 Part 1 p85, SURFACE_STATE, Number of
* Multisamples:
*
* If this field is any value other than MULTISAMPLECOUNT_1 the
* following restrictions apply:
*
* - the Surface Type must be SURFTYPE_2D
* - [...]
*/
if (info->dim != ISL_SURF_DIM_2D)
return false;
/* More obvious restrictions */
if (isl_surf_usage_is_display(info->usage))
return false;
if (tiling == ISL_TILING_LINEAR)
return false;
if (info->levels > 1)
return false;
*msaa_layout = ISL_MSAA_LAYOUT_INTERLEAVED;
return true;
}
void
isl_gen6_choose_image_alignment_el(const struct isl_device *dev,
const struct isl_surf_init_info *restrict info,
enum isl_tiling tiling,
enum isl_dim_layout dim_layout,
enum isl_msaa_layout msaa_layout,
struct isl_extent3d *image_align_el)
{
/* Handled by isl_choose_image_alignment_el */
assert(info->format != ISL_FORMAT_HIZ);
/* Note that the surface's horizontal image alignment is not programmable
* on Sandybridge.
*
* From the Sandybridge PRM (2011-05), Volume 1, Part 1, Section 7.18.3.4
* Alignment Unit Size:
*
* Note that the compressed formats are padded to a full compression cell.
*
* +------------------------+--------+--------+
* | format | halign | valign |
* +------------------------+--------+--------+
* | YUV 4:2:2 formats | 4 | * |
* | BC1-5 | 4 | 4 |
* | FXT1 | 8 | 4 |
* | uncompressed formats | 4 | * |
* +------------------------+--------+--------+
*
* * For these formats, the vertical alignment factor “j” is determined
* as follows:
* - j = 4 for any depth buffer
* - j = 2 for separate stencil buffer
* - j = 4 for any render target surface is multisampled (4x)
* - j = 2 for all other render target surface
*
* From the Sandrybridge PRM (2011-05), Volume 4, Part 1, Section 2.11.2
* SURFACE_STATE, Surface Vertical Alignment:
*
* - This field must be set to VALIGN_2 if the Surface Format is 96 bits
* per element (BPE).
*
* - Value of 1 [VALIGN_4] is not supported for format YCRCB_NORMAL
* (0x182), YCRCB_SWAPUVY (0x183), YCRCB_SWAPUV (0x18f), YCRCB_SWAPY
* (0x190)
*/
if (isl_format_is_compressed(info->format)) {
/* Compressed formats have an alignment equal to their block size */
*image_align_el = isl_extent3d(1, 1, 1);
return;
}
/* Separate stencil requires 4x2 alignment */
if (isl_surf_usage_is_stencil(info->usage) &&
info->format == ISL_FORMAT_R8_UINT) {
*image_align_el = isl_extent3d(4, 2, 1);
return;
}
/* Depth or combined depth stencil surfaces require 4x4 alignment */
if (isl_surf_usage_is_depth_or_stencil(info->usage)) {
*image_align_el = isl_extent3d(4, 4, 1);
return;
}
if (info->samples > 1) {
*image_align_el = isl_extent3d(4, 4, 1);
return;
}
/* For everything else, 4x2 is always a valid alignment. Since this is
* also the smallest alignment we can specify, we use 4x2 for everything
* else because it uses the least memory.
*/
*image_align_el = isl_extent3d(4, 2, 1);
}
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