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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_gen8.h"
#include "isl_priv.h"
bool
gen8_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)
{
bool require_array = false;
bool require_interleaved = false;
assert(info->samples >= 1);
if (info->samples == 1) {
*msaa_layout = ISL_MSAA_LAYOUT_NONE;
return true;
}
/* From the Broadwell PRM >> Volume2d: Command Structures >>
* RENDER_SURFACE_STATE Tile Mode:
*
* - If Number of Multisamples is not MULTISAMPLECOUNT_1, this field
* must be YMAJOR.
*
* As usual, though, stencil is special.
*/
if (!isl_tiling_is_any_y(tiling) && !isl_surf_usage_is_stencil(info->usage))
return false;
/* From the Broadwell PRM >> Volume2d: Command Structures >>
* RENDER_SURFACE_STATE Multisampled Surface Storage Format:
*
* All multisampled render target surfaces must have this field set to
* MSFMT_MSS
*/
if (info->usage & ISL_SURF_USAGE_RENDER_TARGET_BIT)
require_array = true;
/* From the Broadwell PRM >> Volume2d: Command Structures >>
* RENDER_SURFACE_STATE Number of Multisamples:
*
* - If this field is any value other than MULTISAMPLECOUNT_1, the
* Surface Type must be SURFTYPE_2D This field must be set to
* MULTISAMPLECOUNT_1 unless the surface is a Sampling Engine surface
* or Render Target surface.
*
* - If this field is any value other than MULTISAMPLECOUNT_1, Surface
* Min LOD, Mip Count / LOD, and Resource Min LOD must be set to zero.
*/
if (info->dim != ISL_SURF_DIM_2D)
return false;
if (info->levels > 1)
return false;
/* More obvious restrictions */
if (isl_surf_usage_is_display(info->usage))
return false;
if (isl_format_is_compressed(info->format))
return false;
if (isl_format_is_yuv(info->format))
return false;
if (isl_surf_usage_is_depth_or_stencil(info->usage))
require_interleaved = true;
if (require_array && require_interleaved)
return false;
if (require_interleaved) {
*msaa_layout = ISL_MSAA_LAYOUT_INTERLEAVED;
return true;
}
*msaa_layout = ISL_MSAA_LAYOUT_ARRAY;
return true;
}
/**
* Choose horizontal subimage alignment, in units of surface elements.
*/
static uint32_t
gen8_choose_halign_el(const struct isl_device *dev,
const struct isl_surf_init_info *restrict info)
{
if (isl_format_is_compressed(info->format))
return 1;
/* From the Broadwell PRM, Volume 2d "Command Reference: Structures",
* RENDER_SURFACE_STATE Surface Horizontal Alignment, p326:
*
* - This field is intended to be set to HALIGN_8 only if the surface
* was rendered as a depth buffer with Z16 format or a stencil buffer.
* In this case it must be set to HALIGN_8 since these surfaces
* support only alignment of 8. [...]
*/
if (isl_surf_info_is_z16(info))
return 8;
if (isl_surf_usage_is_stencil(info->usage))
return 8;
/* From the Broadwell PRM, Volume 2d "Command Reference: Structures",
* RENDER_SURFACE_STATE Surface Horizontal Alignment, p326:
*
* [...] For Z32 formats it must be set to HALIGN_4.
*/
if (isl_surf_usage_is_depth(info->usage))
return 4;
if (!(info->usage & ISL_SURF_USAGE_DISABLE_AUX_BIT)) {
/* From the Broadwell PRM, Volume 2d "Command Reference: Structures",
* RENDER_SURFACE_STATE Surface Horizontal Alignment, p326:
*
* - When Auxiliary Surface Mode is set to AUX_CCS_D or AUX_CCS_E,
* HALIGN 16 must be used.
*
* This case handles color surfaces that may own an auxiliary MCS, CCS_D,
* or CCS_E. Depth buffers, including those that own an auxiliary HiZ
* surface, are handled above and do not require HALIGN_16.
*/
assert(!isl_surf_usage_is_depth(info->usage));
return 16;
}
/* XXX(chadv): I believe the hardware requires each image to be
* cache-aligned. If that's true, then defaulting to halign=4 is wrong for
* many formats. Depending on the format's block size, we may need to
* increase halign to 8.
*/
return 4;
}
/**
* Choose vertical subimage alignment, in units of surface elements.
*/
static uint32_t
gen8_choose_valign_el(const struct isl_device *dev,
const struct isl_surf_init_info *restrict info)
{
/* From the Broadwell PRM > Volume 2d: Command Reference: Structures
* > RENDER_SURFACE_STATE Surface Vertical Alignment (p325):
*
* - For Sampling Engine and Render Target Surfaces: This field
* specifies the vertical alignment requirement in elements for the
* surface. [...] An element is defined as a pixel in uncompresed
* surface formats, and as a compression block in compressed surface
* formats. For MSFMT_DEPTH_STENCIL type multisampled surfaces, an
* element is a sample.
*
* - This field is intended to be set to VALIGN_4 if the surface was
* rendered as a depth buffer, for a multisampled (4x) render target,
* or for a multisampled (8x) render target, since these surfaces
* support only alignment of 4. Use of VALIGN_4 for other surfaces is
* supported, but increases memory usage.
*
* - This field is intended to be set to VALIGN_8 only if the surface
* was rendered as a stencil buffer, since stencil buffer surfaces
* support only alignment of 8. If set to VALIGN_8, Surface Format
* must be R8_UINT.
*/
if (isl_format_is_compressed(info->format))
return 1;
if (isl_surf_usage_is_stencil(info->usage))
return 8;
return 4;
}
void
gen8_choose_image_alignment_el(const struct isl_device *dev,
const struct isl_surf_init_info *restrict info,
enum isl_tiling tiling,
enum isl_msaa_layout msaa_layout,
struct isl_extent3d *image_align_el)
{
assert(!isl_tiling_is_std_y(tiling));
/* The below text from the Broadwell PRM provides some insight into the
* hardware's requirements for LOD alignment. From the Broadwell PRM >>
* Volume 5: Memory Views >> Surface Layout >> 2D Surfaces:
*
* These [2D surfaces] must adhere to the following memory organization
* rules:
*
* - For non-compressed texture formats, each mipmap must start on an
* even row within the monolithic rectangular area. For
* 1-texel-high mipmaps, this may require a row of padding below
* the previous mipmap. This restriction does not apply to any
* compressed texture formats; each subsequent (lower-res)
* compressed mipmap is positioned directly below the previous
* mipmap.
*
* - Vertical alignment restrictions vary with memory tiling type:
* 1 DWord for linear, 16-byte (DQWord) for tiled. (Note that tiled
* mipmaps are not required to start at the left edge of a tile
* row.)
*/
*image_align_el = (struct isl_extent3d) {
.w = gen8_choose_halign_el(dev, info),
.h = gen8_choose_valign_el(dev, info),
.d = 1,
};
}
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