/* * 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) || (info->usage & ISL_SURF_USAGE_HIZ_BIT)) 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_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); assert(!isl_tiling_is_std_y(tiling)); const struct isl_format_layout *fmtl = isl_format_get_layout(info->format); if (fmtl->txc == ISL_TXC_CCS) { /* * Broadwell PRM Vol 7, "MCS Buffer for Render Target(s)" (p. 676): * * "Mip-mapped and arrayed surfaces are supported with MCS buffer * layout with these alignments in the RT space: Horizontal * Alignment = 256 and Vertical Alignment = 128. */ *image_align_el = isl_extent3d(256 / fmtl->bw, 128 / fmtl->bh, 1); return; } /* 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, }; }