/*
* Copyright 2006 VMware, Inc.
* Copyright © 2006 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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.
*/
/**
* \file brw_tex_layout.cpp
*
* Code to lay out images in a mipmap tree.
*
* \author Keith Whitwell <keithw@vmware.com>
* \author Michel Dänzer <daenzer@vmware.com>
*/
#include "intel_mipmap_tree.h"
#include "brw_context.h"
#include "main/macros.h"
#include "main/glformats.h"
#define FILE_DEBUG_FLAG DEBUG_MIPTREE
static unsigned int
tr_mode_horizontal_texture_alignment(const struct intel_mipmap_tree *mt)
{
unsigned ret_align, divisor, multiplier_ys;
/* Values in below tables specifiy the horizontal alignment requirement
* in elements for TRMODE_YF surface. An element is defined as a pixel in
* uncompressed surface formats, and as a compression block in compressed
* surface formats. For MSFMT_DEPTH_STENCIL type multisampled surfaces, an
* element is a sample.
*/
const unsigned align_1d_yf[] = {4096, 2048, 1024, 512, 256};
const unsigned align_2d_yf[] = {64, 64, 32, 32, 16};
const unsigned align_3d_yf[] = {16, 8, 8, 8, 4};
assert(mt->tr_mode != INTEL_MIPTREE_TRMODE_NONE);
/* Alignment computations below assume a power of 2 cpp. */
assert (mt->cpp >= 1 && mt->cpp <= 16 && _mesa_is_pow_two(mt->cpp));
/* Compute array index. */
const int i = ffs(mt->cpp) - 1;
switch(mt->target) {
case GL_TEXTURE_1D:
case GL_TEXTURE_1D_ARRAY:
ret_align = align_1d_yf[i];
multiplier_ys = 16;
break;
case GL_TEXTURE_2D:
case GL_TEXTURE_RECTANGLE:
case GL_TEXTURE_2D_ARRAY:
case GL_TEXTURE_CUBE_MAP:
case GL_TEXTURE_CUBE_MAP_ARRAY:
case GL_TEXTURE_2D_MULTISAMPLE:
case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
ret_align = align_2d_yf[i];
multiplier_ys = 4;
break;
case GL_TEXTURE_3D:
ret_align = align_3d_yf[i];
multiplier_ys = 4;
break;
default:
unreachable("not reached");
}
if (mt->tr_mode == INTEL_MIPTREE_TRMODE_YS)
ret_align *= multiplier_ys;
assert(_mesa_is_pow_two(mt->num_samples));
switch (mt->num_samples) {
case 2:
case 4:
divisor = 2;
break;
case 8:
case 16:
divisor = 4;
break;
default:
divisor = 1;
break;
}
return ret_align / divisor;
}
static unsigned int
intel_horizontal_texture_alignment_unit(struct brw_context *brw,
struct intel_mipmap_tree *mt,
uint32_t layout_flags)
{
if (layout_flags & MIPTREE_LAYOUT_FORCE_HALIGN16)
return 16;
/**
* +----------------------------------------------------------------------+
* | | alignment unit width ("i") |
* | Surface Property |-----------------------------|
* | | 915 | 965 | ILK | SNB | IVB |
* +----------------------------------------------------------------------+
* | YUV 4:2:2 format | 8 | 4 | 4 | 4 | 4 |
* | BC1-5 compressed format (DXTn/S3TC) | 4 | 4 | 4 | 4 | 4 |
* | FXT1 compressed format | 8 | 8 | 8 | 8 | 8 |
* | Depth Buffer (16-bit) | 4 | 4 | 4 | 4 | 8 |
* | Depth Buffer (other) | 4 | 4 | 4 | 4 | 4 |
* | Separate Stencil Buffer | N/A | N/A | 8 | 8 | 8 |
* | All Others | 4 | 4 | 4 | 4 | 4 |
* +----------------------------------------------------------------------+
*
* On IVB+, non-special cases can be overridden by setting the SURFACE_STATE
* "Surface Horizontal Alignment" field to HALIGN_4 or HALIGN_8.
*/
if (brw->gen >= 7 && mt->format == MESA_FORMAT_Z_UNORM16)
return 8;
return 4;
}
static unsigned int
tr_mode_vertical_texture_alignment(const struct intel_mipmap_tree *mt)
{
unsigned ret_align, divisor, multiplier_ys;
/* Vertical alignment tables for TRMODE_YF */
const unsigned align_2d_yf[] = {64, 32, 32, 16, 16};
const unsigned align_3d_yf[] = {16, 16, 16, 8, 8};
assert(mt->tr_mode != INTEL_MIPTREE_TRMODE_NONE);
/* Alignment computations below assume a power of 2 cpp. */
assert (mt->cpp >= 1 && mt->cpp <= 16 && _mesa_is_pow_two(mt->cpp)) ;
/* Compute array index. */
const int i = ffs(mt->cpp) - 1;
switch(mt->target) {
case GL_TEXTURE_2D:
case GL_TEXTURE_RECTANGLE:
case GL_TEXTURE_2D_ARRAY:
case GL_TEXTURE_CUBE_MAP:
case GL_TEXTURE_CUBE_MAP_ARRAY:
case GL_TEXTURE_2D_MULTISAMPLE:
case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
ret_align = align_2d_yf[i];
multiplier_ys = 4;
break;
case GL_TEXTURE_3D:
ret_align = align_3d_yf[i];
multiplier_ys = 2;
break;
case GL_TEXTURE_1D:
case GL_TEXTURE_1D_ARRAY:
default:
unreachable("Unexpected miptree target");
}
if (mt->tr_mode == INTEL_MIPTREE_TRMODE_YS)
ret_align *= multiplier_ys;
assert(_mesa_is_pow_two(mt->num_samples));
switch (mt->num_samples) {
case 4:
case 8:
divisor = 2;
break;
case 16:
divisor = 4;
break;
default:
divisor = 1;
break;
}
return ret_align / divisor;
}
static unsigned int
intel_vertical_texture_alignment_unit(struct brw_context *brw,
const struct intel_mipmap_tree *mt)
{
/**
* +----------------------------------------------------------------------+
* | | alignment unit height ("j") |
* | Surface Property |-----------------------------|
* | | 915 | 965 | ILK | SNB | IVB |
* +----------------------------------------------------------------------+
* | BC1-5 compressed format (DXTn/S3TC) | 4 | 4 | 4 | 4 | 4 |
* | FXT1 compressed format | 4 | 4 | 4 | 4 | 4 |
* | Depth Buffer | 2 | 2 | 2 | 4 | 4 |
* | Separate Stencil Buffer | N/A | N/A | N/A | 4 | 8 |
* | Multisampled (4x or 8x) render target | N/A | N/A | N/A | 4 | 4 |
* | All Others | 2 | 2 | 2 | * | * |
* +----------------------------------------------------------------------+
*
* Where "*" means either VALIGN_2 or VALIGN_4 depending on the setting of
* the SURFACE_STATE "Surface Vertical Alignment" field.
*/
/* Broadwell only supports VALIGN of 4, 8, and 16. The BSpec says 4
* should always be used, except for stencil buffers, which should be 8.
*/
if (brw->gen >= 8)
return 4;
if (mt->num_samples > 1)
return 4;
GLenum base_format = _mesa_get_format_base_format(mt->format);
if (brw->gen >= 6 &&
(base_format == GL_DEPTH_COMPONENT ||
base_format == GL_DEPTH_STENCIL)) {
return 4;
}
if (brw->gen == 7) {
/* On Gen7, we prefer a vertical alignment of 4 when possible, because
* that allows Y tiled render targets.
*
* From the Ivy Bridge PRM, Vol4 Part1 2.12.2.1 (SURFACE_STATE for most
* messages), on p64, under the heading "Surface Vertical Alignment":
*
* Value of 1 [VALIGN_4] is not supported for format YCRCB_NORMAL
* (0x182), YCRCB_SWAPUVY (0x183), YCRCB_SWAPUV (0x18f), YCRCB_SWAPY
* (0x190)
*
* VALIGN_4 is not supported for surface format R32G32B32_FLOAT.
*/
if (base_format == GL_YCBCR_MESA || mt->format == MESA_FORMAT_RGB_FLOAT32)
return 2;
return 4;
}
return 2;
}
static void
gen9_miptree_layout_1d(struct intel_mipmap_tree *mt)
{
unsigned x = 0;
unsigned width = mt->physical_width0;
unsigned depth = mt->physical_depth0; /* number of array layers. */
/* When this layout is used the horizontal alignment is fixed at 64 and the
* hardware ignores the value given in the surface state
*/
const unsigned int halign = 64;
mt->total_height = mt->physical_height0;
mt->total_width = 0;
for (unsigned level = mt->first_level; level <= mt->last_level; level++) {
unsigned img_width;
intel_miptree_set_level_info(mt, level, x, 0, depth);
img_width = ALIGN(width, halign);
mt->total_width = MAX2(mt->total_width, x + img_width);
x += img_width;
width = minify(width, 1);
}
}
static void
brw_miptree_layout_2d(struct intel_mipmap_tree *mt)
{
unsigned x = 0;
unsigned y = 0;
unsigned width = mt->physical_width0;
unsigned height = mt->physical_height0;
unsigned depth = mt->physical_depth0; /* number of array layers. */
unsigned int bw, bh;
_mesa_get_format_block_size(mt->format, &bw, &bh);
mt->total_width = mt->physical_width0;
if (mt->compressed)
mt->total_width = ALIGN_NPOT(mt->total_width, bw);
/* May need to adjust width to accommodate the placement of
* the 2nd mipmap. This occurs when the alignment
* constraints of mipmap placement push the right edge of the
* 2nd mipmap out past the width of its parent.
*/
if (mt->first_level != mt->last_level) {
unsigned mip1_width;
if (mt->compressed) {
mip1_width = ALIGN_NPOT(minify(mt->physical_width0, 1), mt->halign) +
ALIGN_NPOT(minify(mt->physical_width0, 2), bw);
} else {
mip1_width = ALIGN_NPOT(minify(mt->physical_width0, 1), mt->halign) +
minify(mt->physical_width0, 2);
}
if (mip1_width > mt->total_width) {
mt->total_width = mip1_width;
}
}
mt->total_width /= bw;
mt->total_height = 0;
for (unsigned level = mt->first_level; level <= mt->last_level; level++) {
unsigned img_height;
intel_miptree_set_level_info(mt, level, x, y, depth);
img_height = ALIGN_NPOT(height, mt->valign);
if (mt->compressed)
img_height /= bh;
if (mt->array_layout == ALL_SLICES_AT_EACH_LOD) {
/* Compact arrays with separated miplevels */
img_height *= depth;
}
/* Because the images are packed better, the final offset
* might not be the maximal one:
*/
mt->total_height = MAX2(mt->total_height, y + img_height);
/* Layout_below: step right after second mipmap.
*/
if (level == mt->first_level + 1) {
x += ALIGN_NPOT(width, mt->halign) / bw;
} else {
y += img_height;
}
width = minify(width, 1);
height = minify(height, 1);
if (mt->target == GL_TEXTURE_3D)
depth = minify(depth, 1);
}
}
unsigned
brw_miptree_get_horizontal_slice_pitch(const struct brw_context *brw,
const struct intel_mipmap_tree *mt,
unsigned level)
{
if ((brw->gen < 9 && mt->target == GL_TEXTURE_3D) ||
(brw->gen == 4 && mt->target == GL_TEXTURE_CUBE_MAP)) {
return ALIGN_NPOT(minify(mt->physical_width0, level), mt->halign);
} else {
return 0;
}
}
unsigned
brw_miptree_get_vertical_slice_pitch(const struct brw_context *brw,
const struct intel_mipmap_tree *mt,
unsigned level)
{
if (brw->gen >= 9) {
/* ALL_SLICES_AT_EACH_LOD isn't supported on Gen8+ but this code will
* effectively end up with a packed qpitch anyway whenever
* mt->first_level == mt->last_level.
*/
assert(mt->array_layout != ALL_SLICES_AT_EACH_LOD);
/* On Gen9 we can pick whatever qpitch we like as long as it's aligned
* to the vertical alignment so we don't need to add any extra rows.
*/
unsigned qpitch = mt->total_height;
/* If the surface might be used as a stencil buffer or HiZ buffer then
* it needs to be a multiple of 8.
*/
const GLenum base_format = _mesa_get_format_base_format(mt->format);
if (_mesa_is_depth_or_stencil_format(base_format))
qpitch = ALIGN(qpitch, 8);
/* 3D textures need to be aligned to the tile height. At this point we
* don't know which tiling will be used so let's just align it to 32
*/
if (mt->target == GL_TEXTURE_3D)
qpitch = ALIGN(qpitch, 32);
return qpitch;
} else if (mt->target == GL_TEXTURE_3D ||
(brw->gen == 4 && mt->target == GL_TEXTURE_CUBE_MAP) ||
mt->array_layout == ALL_SLICES_AT_EACH_LOD) {
return ALIGN_NPOT(minify(mt->physical_height0, level), mt->valign);
} else {
const unsigned h0 = ALIGN_NPOT(mt->physical_height0, mt->valign);
const unsigned h1 = ALIGN_NPOT(minify(mt->physical_height0, 1), mt->valign);
return h0 + h1 + (brw->gen >= 7 ? 12 : 11) * mt->valign;
}
}
static void
align_cube(struct intel_mipmap_tree *mt)
{
/* The 965's sampler lays cachelines out according to how accesses
* in the texture surfaces run, so they may be "vertical" through
* memory. As a result, the docs say in Surface Padding Requirements:
* Sampling Engine Surfaces that two extra rows of padding are required.
*/
if (mt->target == GL_TEXTURE_CUBE_MAP)
mt->total_height += 2;
}
bool
gen9_use_linear_1d_layout(const struct brw_context *brw,
const struct intel_mipmap_tree *mt)
{
/* On Gen9+ the mipmap levels of a 1D surface are all laid out in a
* horizontal line. This isn't done for depth/stencil buffers however
* because those will be using a tiled layout
*/
if (brw->gen >= 9 &&
(mt->target == GL_TEXTURE_1D ||
mt->target == GL_TEXTURE_1D_ARRAY)) {
GLenum base_format = _mesa_get_format_base_format(mt->format);
if (base_format != GL_DEPTH_COMPONENT &&
base_format != GL_DEPTH_STENCIL &&
base_format != GL_STENCIL_INDEX)
return true;
}
return false;
}
static void
brw_miptree_layout_texture_array(struct brw_context *brw,
struct intel_mipmap_tree *mt)
{
unsigned height = mt->physical_height0;
bool layout_1d = gen9_use_linear_1d_layout(brw, mt);
int physical_qpitch;
if (layout_1d)
gen9_miptree_layout_1d(mt);
else
brw_miptree_layout_2d(mt);
if (layout_1d) {
physical_qpitch = 1;
/* When using the horizontal layout the qpitch specifies the distance in
* pixels between array slices. The total_width is forced to be a
* multiple of the horizontal alignment in brw_miptree_layout_1d (in
* this case it's always 64). The vertical alignment is ignored.
*/
mt->qpitch = mt->total_width;
} else {
mt->qpitch = brw_miptree_get_vertical_slice_pitch(brw, mt, 0);
/* Unlike previous generations the qpitch is a multiple of the
* compressed block size on Gen9 so physical_qpitch matches mt->qpitch.
*/
physical_qpitch = (mt->compressed && brw->gen < 9 ? mt->qpitch / 4 :
mt->qpitch);
}
for (unsigned level = mt->first_level; level <= mt->last_level; level++) {
unsigned img_height;
img_height = ALIGN_NPOT(height, mt->valign);
if (mt->compressed)
img_height /= mt->valign;
for (unsigned q = 0; q < mt->level[level].depth; q++) {
if (mt->array_layout == ALL_SLICES_AT_EACH_LOD) {
intel_miptree_set_image_offset(mt, level, q, 0, q * img_height);
} else {
intel_miptree_set_image_offset(mt, level, q, 0, q * physical_qpitch);
}
}
height = minify(height, 1);
}
if (mt->array_layout == ALL_LOD_IN_EACH_SLICE)
mt->total_height = physical_qpitch * mt->physical_depth0;
align_cube(mt);
}
static void
brw_miptree_layout_texture_3d(struct brw_context *brw,
struct intel_mipmap_tree *mt)
{
mt->total_width = 0;
mt->total_height = 0;
unsigned ysum = 0;
unsigned bh, bw;
_mesa_get_format_block_size(mt->format, &bw, &bh);
for (unsigned level = mt->first_level; level <= mt->last_level; level++) {
unsigned WL = MAX2(mt->physical_width0 >> level, 1);
unsigned HL = MAX2(mt->physical_height0 >> level, 1);
unsigned DL = MAX2(mt->physical_depth0 >> level, 1);
unsigned wL = ALIGN_NPOT(WL, mt->halign);
unsigned hL = ALIGN_NPOT(HL, mt->valign);
if (mt->target == GL_TEXTURE_CUBE_MAP)
DL = 6;
intel_miptree_set_level_info(mt, level, 0, 0, DL);
for (unsigned q = 0; q < DL; q++) {
unsigned x = (q % (1 << level)) * wL;
unsigned y = ysum + (q >> level) * hL;
intel_miptree_set_image_offset(mt, level, q, x / bw, y / bh);
mt->total_width = MAX2(mt->total_width, (x + wL) / bw);
mt->total_height = MAX2(mt->total_height, (y + hL) / bh);
}
ysum += ALIGN(DL, 1 << level) / (1 << level) * hL;
}
align_cube(mt);
}
/**
* \brief Helper function for intel_miptree_create().
*/
static uint32_t
brw_miptree_choose_tiling(struct brw_context *brw,
const struct intel_mipmap_tree *mt,
uint32_t layout_flags)
{
if (mt->format == MESA_FORMAT_S_UINT8) {
/* The stencil buffer is W tiled. However, we request from the kernel a
* non-tiled buffer because the GTT is incapable of W fencing.
*/
return I915_TILING_NONE;
}
/* Do not support changing the tiling for miptrees with pre-allocated BOs. */
assert((layout_flags & MIPTREE_LAYOUT_FOR_BO) == 0);
/* Some usages may want only one type of tiling, like depth miptrees (Y
* tiled), or temporary BOs for uploading data once (linear).
*/
switch (layout_flags & MIPTREE_LAYOUT_TILING_ANY) {
case MIPTREE_LAYOUT_TILING_ANY:
break;
case MIPTREE_LAYOUT_TILING_Y:
return I915_TILING_Y;
case MIPTREE_LAYOUT_TILING_NONE:
return I915_TILING_NONE;
}
if (mt->num_samples > 1) {
/* From p82 of the Sandy Bridge PRM, dw3[1] of SURFACE_STATE ("Tiled
* Surface"):
*
* [DevSNB+]: For multi-sample render targets, this field must be
* 1. MSRTs can only be tiled.
*
* Our usual reason for preferring X tiling (fast blits using the
* blitting engine) doesn't apply to MSAA, since we'll generally be
* downsampling or upsampling when blitting between the MSAA buffer
* and another buffer, and the blitting engine doesn't support that.
* So use Y tiling, since it makes better use of the cache.
*/
return I915_TILING_Y;
}
GLenum base_format = _mesa_get_format_base_format(mt->format);
if (base_format == GL_DEPTH_COMPONENT ||
base_format == GL_DEPTH_STENCIL_EXT)
return I915_TILING_Y;
/* 1D textures (and 1D array textures) don't get any benefit from tiling,
* in fact it leads to a less efficient use of memory space and bandwidth
* due to tile alignment.
*/
if (mt->logical_height0 == 1)
return I915_TILING_NONE;
int minimum_pitch = mt->total_width * mt->cpp;
/* If the width is much smaller than a tile, don't bother tiling. */
if (minimum_pitch < 64)
return I915_TILING_NONE;
if (ALIGN(minimum_pitch, 512) >= 32768) {
perf_debug("%dx%d miptree too large to blit, falling back to untiled",
mt->total_width, mt->total_height);
return I915_TILING_NONE;
}
/* Pre-gen6 doesn't have BLORP to handle Y-tiling, so use X-tiling. */
if (brw->gen < 6)
return I915_TILING_X;
/* From the Sandybridge PRM, Volume 1, Part 2, page 32:
* "NOTE: 128BPE Format Color Buffer ( render target ) MUST be either TileX
* or Linear."
* 128 bits per pixel translates to 16 bytes per pixel. This is necessary
* all the way back to 965, but is permitted on Gen7+.
*/
if (brw->gen < 7 && mt->cpp >= 16)
return I915_TILING_X;
/* From the Ivy Bridge PRM, Vol4 Part1 2.12.2.1 (SURFACE_STATE for most
* messages), on p64, under the heading "Surface Vertical Alignment":
*
* This field must be set to VALIGN_4 for all tiled Y Render Target
* surfaces.
*
* So if the surface is renderable and uses a vertical alignment of 2,
* force it to be X tiled. This is somewhat conservative (it's possible
* that the client won't ever render to this surface), but it's difficult
* to know that ahead of time. And besides, since we use a vertical
* alignment of 4 as often as we can, this shouldn't happen very often.
*/
if (brw->gen == 7 && mt->valign == 2 &&
brw->format_supported_as_render_target[mt->format]) {
return I915_TILING_X;
}
return I915_TILING_Y | I915_TILING_X;
}
static void
intel_miptree_set_total_width_height(struct brw_context *brw,
struct intel_mipmap_tree *mt)
{
switch (mt->target) {
case GL_TEXTURE_CUBE_MAP:
if (brw->gen == 4) {
/* Gen4 stores cube maps as 3D textures. */
assert(mt->physical_depth0 == 6);
brw_miptree_layout_texture_3d(brw, mt);
} else {
/* All other hardware stores cube maps as 2D arrays. */
brw_miptree_layout_texture_array(brw, mt);
}
break;
case GL_TEXTURE_3D:
if (brw->gen >= 9)
brw_miptree_layout_texture_array(brw, mt);
else
brw_miptree_layout_texture_3d(brw, mt);
break;
case GL_TEXTURE_1D_ARRAY:
case GL_TEXTURE_2D_ARRAY:
case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
case GL_TEXTURE_CUBE_MAP_ARRAY:
brw_miptree_layout_texture_array(brw, mt);
break;
default:
switch (mt->msaa_layout) {
case INTEL_MSAA_LAYOUT_UMS:
case INTEL_MSAA_LAYOUT_CMS:
brw_miptree_layout_texture_array(brw, mt);
break;
case INTEL_MSAA_LAYOUT_NONE:
case INTEL_MSAA_LAYOUT_IMS:
if (gen9_use_linear_1d_layout(brw, mt))
gen9_miptree_layout_1d(mt);
else
brw_miptree_layout_2d(mt);
break;
}
break;
}
DBG("%s: %dx%dx%d\n", __func__,
mt->total_width, mt->total_height, mt->cpp);
}
static void
intel_miptree_set_alignment(struct brw_context *brw,
struct intel_mipmap_tree *mt,
uint32_t layout_flags)
{
/**
* From the "Alignment Unit Size" section of various specs, namely:
* - Gen3 Spec: "Memory Data Formats" Volume, Section 1.20.1.4
* - i965 and G45 PRMs: Volume 1, Section 6.17.3.4.
* - Ironlake and Sandybridge PRMs: Volume 1, Part 1, Section 7.18.3.4
* - BSpec (for Ivybridge and slight variations in separate stencil)
*/
bool gen6_hiz_or_stencil = false;
if (brw->gen == 6 && mt->array_layout == ALL_SLICES_AT_EACH_LOD) {
const GLenum base_format = _mesa_get_format_base_format(mt->format);
gen6_hiz_or_stencil = _mesa_is_depth_or_stencil_format(base_format);
}
if (gen6_hiz_or_stencil) {
/* On gen6, we use ALL_SLICES_AT_EACH_LOD for stencil/hiz because the
* hardware doesn't support multiple mip levels on stencil/hiz.
*
* PRM Vol 2, Part 1, 7.5.3 Hierarchical Depth Buffer:
* "The hierarchical depth buffer does not support the LOD field"
*
* PRM Vol 2, Part 1, 7.5.4.1 Separate Stencil Buffer:
* "The stencil depth buffer does not support the LOD field"
*/
if (mt->format == MESA_FORMAT_S_UINT8) {
/* Stencil uses W tiling, so we force W tiling alignment for the
* ALL_SLICES_AT_EACH_LOD miptree layout.
*/
mt->halign = 64;
mt->valign = 64;
assert((layout_flags & MIPTREE_LAYOUT_FORCE_HALIGN16) == 0);
} else {
/* Depth uses Y tiling, so we force need Y tiling alignment for the
* ALL_SLICES_AT_EACH_LOD miptree layout.
*/
mt->halign = 128 / mt->cpp;
mt->valign = 32;
}
} else if (mt->compressed) {
/* The hardware alignment requirements for compressed textures
* happen to match the block boundaries.
*/
_mesa_get_format_block_size(mt->format, &mt->halign, &mt->valign);
/* On Gen9+ we can pick our own alignment for compressed textures but it
* has to be a multiple of the block size. The minimum alignment we can
* pick is 4 so we effectively have to align to 4 times the block
* size
*/
if (brw->gen >= 9) {
mt->halign *= 4;
mt->valign *= 4;
}
} else if (mt->format == MESA_FORMAT_S_UINT8) {
mt->halign = 8;
mt->valign = brw->gen >= 7 ? 8 : 4;
} else if (brw->gen >= 9 && mt->tr_mode != INTEL_MIPTREE_TRMODE_NONE) {
mt->halign = tr_mode_horizontal_texture_alignment(mt);
mt->valign = tr_mode_vertical_texture_alignment(mt);
} else {
mt->halign =
intel_horizontal_texture_alignment_unit(brw, mt, layout_flags);
mt->valign = intel_vertical_texture_alignment_unit(brw, mt);
}
}
void
brw_miptree_layout(struct brw_context *brw,
struct intel_mipmap_tree *mt,
uint32_t layout_flags)
{
mt->tr_mode = INTEL_MIPTREE_TRMODE_NONE;
intel_miptree_set_alignment(brw, mt, layout_flags);
intel_miptree_set_total_width_height(brw, mt);
if (!mt->total_width || !mt->total_height) {
intel_miptree_release(&mt);
return;
}
/* On Gen9+ the alignment values are expressed in multiples of the block
* size
*/
if (brw->gen >= 9) {
unsigned int i, j;
_mesa_get_format_block_size(mt->format, &i, &j);
mt->halign /= i;
mt->valign /= j;
}
if ((layout_flags & MIPTREE_LAYOUT_FOR_BO) == 0)
mt->tiling = brw_miptree_choose_tiling(brw, mt, layout_flags);
}