/* * 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_gfx6.h" #include "isl_priv.h" bool isl_gfx6_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_GFX_VER(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_gfx6_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 ā€œjā€ 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); }