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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_gen9.h"
#include "isl_priv.h"
/**
* Calculate the surface's subimage alignment, in units of surface samples,
* for the standard tiling formats Yf and Ys.
*/
static void
gen9_calc_std_image_alignment_sa(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 *align_sa)
{
const struct isl_format_layout *fmtl = isl_format_get_layout(info->format);
assert(isl_tiling_is_std_y(tiling));
const uint32_t bpb = fmtl->bpb;
const uint32_t is_Ys = tiling == ISL_TILING_Ys;
switch (info->dim) {
case ISL_SURF_DIM_1D:
/* See the Skylake BSpec > Memory Views > Common Surface Formats > Surface
* Layout and Tiling > 1D Surfaces > 1D Alignment Requirements.
*/
*align_sa = (struct isl_extent3d) {
.w = 1 << (12 - (ffs(bpb) - 4) + (4 * is_Ys)),
.h = 1,
.d = 1,
};
return;
case ISL_SURF_DIM_2D:
/* See the Skylake BSpec > Memory Views > Common Surface Formats >
* Surface Layout and Tiling > 2D Surfaces > 2D/CUBE Alignment
* Requirements.
*/
*align_sa = (struct isl_extent3d) {
.w = 1 << (6 - ((ffs(bpb) - 4) / 2) + (4 * is_Ys)),
.h = 1 << (6 - ((ffs(bpb) - 3) / 2) + (4 * is_Ys)),
.d = 1,
};
if (is_Ys) {
/* FINISHME(chadv): I don't trust this code. Untested. */
isl_finishme("%s:%s: [SKL+] multisample TileYs", __FILE__, __func__);
switch (msaa_layout) {
case ISL_MSAA_LAYOUT_NONE:
case ISL_MSAA_LAYOUT_INTERLEAVED:
break;
case ISL_MSAA_LAYOUT_ARRAY:
align_sa->w >>= (ffs(info->samples) - 0) / 2;
align_sa->h >>= (ffs(info->samples) - 1) / 2;
break;
}
}
return;
case ISL_SURF_DIM_3D:
/* See the Skylake BSpec > Memory Views > Common Surface Formats > Surface
* Layout and Tiling > 1D Surfaces > 1D Alignment Requirements.
*/
*align_sa = (struct isl_extent3d) {
.w = 1 << (4 - ((ffs(bpb) - 2) / 3) + (4 * is_Ys)),
.h = 1 << (4 - ((ffs(bpb) - 4) / 3) + (2 * is_Ys)),
.d = 1 << (4 - ((ffs(bpb) - 3) / 3) + (2 * is_Ys)),
};
return;
}
unreachable("bad isl_surface_type");
}
void
gen9_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)
{
/* This BSpec text provides some insight into the hardware's alignment
* requirements [Skylake BSpec > Memory Views > Common Surface Formats >
* Surface Layout and Tiling > 2D Surfaces]:
*
* An LOD must be aligned to a cache-line except for some special cases
* related to Planar YUV surfaces. In general, the cache-alignment
* restriction implies there is a minimum height for an LOD of 4 texels.
* So, LODs which are smaller than 4 high are padded.
*
* From the Skylake BSpec, RENDER_SURFACE_STATE Surface Vertical Alignment:
*
* - 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 used for 2D, CUBE, and 3D surface alignment when Tiled
* Resource Mode is TRMODE_NONE (Tiled Resource Mode is disabled).
* This field is ignored for 1D surfaces and also when Tiled Resource
* Mode is not TRMODE_NONE (e.g. Tiled Resource Mode is enabled).
*
* See the appropriate Alignment table in the "Surface Layout and
* Tiling" section under Common Surface Formats for the table of
* alignment values for Tiled Resrouces.
*
* - For uncompressed surfaces, the units of "j" are rows of pixels on
* the physical surface. For compressed texture formats, the units of
* "j" are in compression blocks, thus each increment in "j" is equal
* to h pixels, where h is the height of the compression block in
* pixels.
*
* - Valid Values: VALIGN_4, VALIGN_8, VALIGN_16
*
* From the Skylake BSpec, RENDER_SURFACE_STATE Surface Horizontal
* Alignment:
*
* - For uncompressed surfaces, the units of "i" are pixels on the
* physical surface. For compressed texture formats, the units of "i"
* are in compression blocks, thus each increment in "i" is equal to
* w pixels, where w is the width of the compression block in pixels.
*
* - Valid Values: HALIGN_4, HALIGN_8, HALIGN_16
*/
if (isl_tiling_is_std_y(tiling)) {
struct isl_extent3d image_align_sa;
gen9_calc_std_image_alignment_sa(dev, info, tiling, msaa_layout,
&image_align_sa);
*image_align_el = isl_extent3d_sa_to_el(info->format, image_align_sa);
return;
}
if (info->dim == ISL_SURF_DIM_1D) {
/* See the Skylake BSpec > Memory Views > Common Surface Formats > Surface
* Layout and Tiling > 1D Surfaces > 1D Alignment Requirements.
*/
*image_align_el = isl_extent3d(64, 1, 1);
return;
}
if (isl_format_is_compressed(info->format)) {
/* On Gen9, the meaning of RENDER_SURFACE_STATE's
* SurfaceHorizontalAlignment and SurfaceVerticalAlignment changed for
* compressed formats. They now indicate a multiple of the compression
* block. For example, if the compression mode is ETC2 then HALIGN_4
* indicates a horizontal alignment of 16 pixels.
*
* To avoid wasting memory, choose the smallest alignment possible:
* HALIGN_4 and VALIGN_4.
*/
*image_align_el = isl_extent3d(4, 4, 1);
return;
}
gen8_choose_image_alignment_el(dev, info, tiling, msaa_layout,
image_align_el);
}
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