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Diffstat (limited to 'src/isl/isl.c')
| -rw-r--r-- | src/isl/isl.c | 1428 |
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diff --git a/src/isl/isl.c b/src/isl/isl.c new file mode 100644 index 00000000000..27928fd0850 --- /dev/null +++ b/src/isl/isl.c @@ -0,0 +1,1428 @@ +/* + * 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 <assert.h> + +#include "isl.h" +#include "isl_gen4.h" +#include "isl_gen6.h" +#include "isl_gen7.h" +#include "isl_gen8.h" +#include "isl_gen9.h" +#include "isl_priv.h" + +void PRINTFLIKE(3, 4) UNUSED +__isl_finishme(const char *file, int line, const char *fmt, ...) +{ + va_list ap; + char buf[512]; + + va_start(ap, fmt); + vsnprintf(buf, sizeof(buf), fmt, ap); + va_end(ap); + + fprintf(stderr, "%s:%d: FINISHME: %s\n", file, line, buf); +} + +void +isl_device_init(struct isl_device *dev, + const struct brw_device_info *info, + bool has_bit6_swizzling) +{ + dev->info = info; + dev->use_separate_stencil = ISL_DEV_GEN(dev) >= 6; + dev->has_bit6_swizzling = has_bit6_swizzling; + + /* The ISL_DEV macros may be defined in the CFLAGS, thus hardcoding some + * device properties at buildtime. Verify that the macros with the device + * properties chosen during runtime. + */ + assert(ISL_DEV_GEN(dev) == dev->info->gen); + assert(ISL_DEV_USE_SEPARATE_STENCIL(dev) == dev->use_separate_stencil); + + /* Did we break hiz or stencil? */ + if (ISL_DEV_USE_SEPARATE_STENCIL(dev)) + assert(info->has_hiz_and_separate_stencil); + if (info->must_use_separate_stencil) + assert(ISL_DEV_USE_SEPARATE_STENCIL(dev)); +} + +/** + * @brief Query the set of multisamples supported by the device. + * + * This function always returns non-zero, as ISL_SAMPLE_COUNT_1_BIT is always + * supported. + */ +isl_sample_count_mask_t ATTRIBUTE_CONST +isl_device_get_sample_counts(struct isl_device *dev) +{ + if (ISL_DEV_GEN(dev) >= 9) { + return ISL_SAMPLE_COUNT_1_BIT | + ISL_SAMPLE_COUNT_2_BIT | + ISL_SAMPLE_COUNT_4_BIT | + ISL_SAMPLE_COUNT_8_BIT | + ISL_SAMPLE_COUNT_16_BIT; + } else if (ISL_DEV_GEN(dev) >= 8) { + return ISL_SAMPLE_COUNT_1_BIT | + ISL_SAMPLE_COUNT_2_BIT | + ISL_SAMPLE_COUNT_4_BIT | + ISL_SAMPLE_COUNT_8_BIT; + } else if (ISL_DEV_GEN(dev) >= 7) { + return ISL_SAMPLE_COUNT_1_BIT | + ISL_SAMPLE_COUNT_4_BIT | + ISL_SAMPLE_COUNT_8_BIT; + } else if (ISL_DEV_GEN(dev) >= 6) { + return ISL_SAMPLE_COUNT_1_BIT | + ISL_SAMPLE_COUNT_4_BIT; + } else { + return ISL_SAMPLE_COUNT_1_BIT; + } +} + +/** + * @param[out] info is written only on success + */ +bool +isl_tiling_get_info(const struct isl_device *dev, + enum isl_tiling tiling, + uint32_t format_block_size, + struct isl_tile_info *tile_info) +{ + const uint32_t bs = format_block_size; + uint32_t width, height; + + assert(bs > 0); + + switch (tiling) { + case ISL_TILING_LINEAR: + width = 1; + height = 1; + break; + + case ISL_TILING_X: + width = 1 << 9; + height = 1 << 3; + break; + + case ISL_TILING_Y0: + width = 1 << 7; + height = 1 << 5; + break; + + case ISL_TILING_W: + /* XXX: Should W tile be same as Y? */ + width = 1 << 6; + height = 1 << 6; + break; + + case ISL_TILING_Yf: + case ISL_TILING_Ys: { + if (ISL_DEV_GEN(dev) < 9) + return false; + + if (!isl_is_pow2(bs)) + return false; + + bool is_Ys = tiling == ISL_TILING_Ys; + + width = 1 << (6 + (ffs(bs) / 2) + (2 * is_Ys)); + height = 1 << (6 - (ffs(bs) / 2) + (2 * is_Ys)); + break; + } + } /* end switch */ + + *tile_info = (struct isl_tile_info) { + .tiling = tiling, + .width = width, + .height = height, + .size = width * height, + }; + + return true; +} + +void +isl_tiling_get_extent(const struct isl_device *dev, + enum isl_tiling tiling, + uint32_t format_block_size, + struct isl_extent2d *e) +{ + struct isl_tile_info tile_info; + isl_tiling_get_info(dev, tiling, format_block_size, &tile_info); + *e = isl_extent2d(tile_info.width, tile_info.height); +} + +/** + * @param[out] tiling is set only on success + */ +bool +isl_surf_choose_tiling(const struct isl_device *dev, + const struct isl_surf_init_info *restrict info, + enum isl_tiling *tiling) +{ + isl_tiling_flags_t tiling_flags = info->tiling_flags; + + if (ISL_DEV_GEN(dev) >= 7) { + gen7_filter_tiling(dev, info, &tiling_flags); + } else { + isl_finishme("%s: gen%u", __func__, ISL_DEV_GEN(dev)); + gen7_filter_tiling(dev, info, &tiling_flags); + } + + #define CHOOSE(__tiling) \ + do { \ + if (tiling_flags & (1u << (__tiling))) { \ + *tiling = (__tiling); \ + return true; \ + } \ + } while (0) + + /* Of the tiling modes remaining, choose the one that offers the best + * performance. + */ + + if (info->dim == ISL_SURF_DIM_1D) { + /* Prefer linear for 1D surfaces because they do not benefit from + * tiling. To the contrary, tiling leads to wasted memory and poor + * memory locality due to the swizzling and alignment restrictions + * required in tiled surfaces. + */ + CHOOSE(ISL_TILING_LINEAR); + } + + CHOOSE(ISL_TILING_Ys); + CHOOSE(ISL_TILING_Yf); + CHOOSE(ISL_TILING_Y0); + CHOOSE(ISL_TILING_X); + CHOOSE(ISL_TILING_W); + CHOOSE(ISL_TILING_LINEAR); + + #undef CHOOSE + + /* No tiling mode accomodates the inputs. */ + return false; +} + +static bool +isl_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) +{ + if (ISL_DEV_GEN(dev) >= 8) { + return gen8_choose_msaa_layout(dev, info, tiling, msaa_layout); + } else if (ISL_DEV_GEN(dev) >= 7) { + return gen7_choose_msaa_layout(dev, info, tiling, msaa_layout); + } else if (ISL_DEV_GEN(dev) >= 6) { + return gen6_choose_msaa_layout(dev, info, tiling, msaa_layout); + } else { + return gen4_choose_msaa_layout(dev, info, tiling, msaa_layout); + } +} + +static void +isl_msaa_interleaved_scale_px_to_sa(uint32_t samples, + uint32_t *width, uint32_t *height) +{ + assert(isl_is_pow2(samples)); + + /* From the Broadwell PRM >> Volume 5: Memory Views >> Computing Mip Level + * Sizes (p133): + * + * If the surface is multisampled and it is a depth or stencil surface + * or Multisampled Surface StorageFormat in SURFACE_STATE is + * MSFMT_DEPTH_STENCIL, W_L and H_L must be adjusted as follows before + * proceeding: [...] + */ + if (width) + *width = isl_align(*width, 2) << ((ffs(samples) - 0) / 2); + if (height) + *height = isl_align(*height, 2) << ((ffs(samples) - 1) / 2); +} + +static enum isl_array_pitch_span +isl_choose_array_pitch_span(const struct isl_device *dev, + const struct isl_surf_init_info *restrict info, + enum isl_dim_layout dim_layout, + const struct isl_extent4d *phys_level0_sa) +{ + switch (dim_layout) { + case ISL_DIM_LAYOUT_GEN9_1D: + case ISL_DIM_LAYOUT_GEN4_2D: + if (ISL_DEV_GEN(dev) >= 8) { + /* QPitch becomes programmable in Broadwell. So choose the + * most compact QPitch possible in order to conserve memory. + * + * From the Broadwell PRM >> Volume 2d: Command Reference: Structures + * >> RENDER_SURFACE_STATE Surface QPitch (p325): + * + * - Software must ensure that this field is set to a value + * sufficiently large such that the array slices in the surface + * do not overlap. Refer to the Memory Data Formats section for + * information on how surfaces are stored in memory. + * + * - This field specifies the distance in rows between array + * slices. It is used only in the following cases: + * + * - Surface Array is enabled OR + * - Number of Mulitsamples is not NUMSAMPLES_1 and + * Multisampled Surface Storage Format set to MSFMT_MSS OR + * - Surface Type is SURFTYPE_CUBE + */ + return ISL_ARRAY_PITCH_SPAN_COMPACT; + } else if (ISL_DEV_GEN(dev) >= 7) { + /* Note that Ivybridge introduces + * RENDER_SURFACE_STATE.SurfaceArraySpacing, which provides the + * driver more control over the QPitch. + */ + + if (phys_level0_sa->array_len == 1) { + /* The hardware will never use the QPitch. So choose the most + * compact QPitch possible in order to conserve memory. + */ + return ISL_ARRAY_PITCH_SPAN_COMPACT; + } + + if (isl_surf_usage_is_depth_or_stencil(info->usage)) { + /* From the Ivybridge PRM >> Volume 1 Part 1: Graphics Core >> + * Section 6.18.4.7: Surface Arrays (p112): + * + * If Surface Array Spacing is set to ARYSPC_FULL (note that + * the depth buffer and stencil buffer have an implied value of + * ARYSPC_FULL): + */ + return ISL_ARRAY_PITCH_SPAN_COMPACT; + } + + if (info->levels == 1) { + /* We are able to set RENDER_SURFACE_STATE.SurfaceArraySpacing + * to ARYSPC_LOD0. + */ + return ISL_ARRAY_PITCH_SPAN_COMPACT; + } + + return ISL_ARRAY_PITCH_SPAN_FULL; + } else if ((ISL_DEV_GEN(dev) == 5 || ISL_DEV_GEN(dev) == 6) && + ISL_DEV_USE_SEPARATE_STENCIL(dev) && + isl_surf_usage_is_stencil(info->usage)) { + /* [ILK-SNB] Errata from the Sandy Bridge PRM >> Volume 4 Part 1: + * Graphics Core >> Section 7.18.3.7: Surface Arrays: + * + * The separate stencil buffer does not support mip mapping, thus + * the storage for LODs other than LOD 0 is not needed. + */ + assert(info->levels == 1); + assert(phys_level0_sa->array_len == 1); + return ISL_ARRAY_PITCH_SPAN_COMPACT; + } else { + if ((ISL_DEV_GEN(dev) == 5 || ISL_DEV_GEN(dev) == 6) && + ISL_DEV_USE_SEPARATE_STENCIL(dev) && + isl_surf_usage_is_stencil(info->usage)) { + /* [ILK-SNB] Errata from the Sandy Bridge PRM >> Volume 4 Part 1: + * Graphics Core >> Section 7.18.3.7: Surface Arrays: + * + * The separate stencil buffer does not support mip mapping, + * thus the storage for LODs other than LOD 0 is not needed. + */ + assert(info->levels == 1); + assert(phys_level0_sa->array_len == 1); + return ISL_ARRAY_PITCH_SPAN_COMPACT; + } + + if (phys_level0_sa->array_len == 1) { + /* The hardware will never use the QPitch. So choose the most + * compact QPitch possible in order to conserve memory. + */ + return ISL_ARRAY_PITCH_SPAN_COMPACT; + } + + return ISL_ARRAY_PITCH_SPAN_FULL; + } + + case ISL_DIM_LAYOUT_GEN4_3D: + /* The hardware will never use the QPitch. So choose the most + * compact QPitch possible in order to conserve memory. + */ + return ISL_ARRAY_PITCH_SPAN_COMPACT; + } + + unreachable("bad isl_dim_layout"); + return ISL_ARRAY_PITCH_SPAN_FULL; +} + +static void +isl_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) +{ + if (ISL_DEV_GEN(dev) >= 9) { + gen9_choose_image_alignment_el(dev, info, tiling, msaa_layout, + image_align_el); + } else if (ISL_DEV_GEN(dev) >= 8) { + gen8_choose_image_alignment_el(dev, info, tiling, msaa_layout, + image_align_el); + } else if (ISL_DEV_GEN(dev) >= 7) { + gen7_choose_image_alignment_el(dev, info, tiling, msaa_layout, + image_align_el); + } else if (ISL_DEV_GEN(dev) >= 6) { + gen6_choose_image_alignment_el(dev, info, tiling, msaa_layout, + image_align_el); + } else { + gen4_choose_image_alignment_el(dev, info, tiling, msaa_layout, + image_align_el); + } +} + +static enum isl_dim_layout +isl_surf_choose_dim_layout(const struct isl_device *dev, + enum isl_surf_dim logical_dim) +{ + if (ISL_DEV_GEN(dev) >= 9) { + switch (logical_dim) { + case ISL_SURF_DIM_1D: + return ISL_DIM_LAYOUT_GEN9_1D; + case ISL_SURF_DIM_2D: + case ISL_SURF_DIM_3D: + return ISL_DIM_LAYOUT_GEN4_2D; + } + } else { + switch (logical_dim) { + case ISL_SURF_DIM_1D: + case ISL_SURF_DIM_2D: + return ISL_DIM_LAYOUT_GEN4_2D; + case ISL_SURF_DIM_3D: + return ISL_DIM_LAYOUT_GEN4_3D; + } + } + + unreachable("bad isl_surf_dim"); + return ISL_DIM_LAYOUT_GEN4_2D; +} + +/** + * Calculate the physical extent of the surface's first level, in units of + * surface samples. The result is aligned to the format's compression block. + */ +static void +isl_calc_phys_level0_extent_sa(const struct isl_device *dev, + const struct isl_surf_init_info *restrict info, + enum isl_dim_layout dim_layout, + enum isl_tiling tiling, + enum isl_msaa_layout msaa_layout, + struct isl_extent4d *phys_level0_sa) +{ + const struct isl_format_layout *fmtl = isl_format_get_layout(info->format); + + if (isl_format_is_yuv(info->format)) + isl_finishme("%s:%s: YUV format", __FILE__, __func__); + + switch (info->dim) { + case ISL_SURF_DIM_1D: + assert(info->height == 1); + assert(info->depth == 1); + assert(info->samples == 1); + assert(!isl_format_is_compressed(info->format)); + + switch (dim_layout) { + case ISL_DIM_LAYOUT_GEN4_3D: + unreachable("bad isl_dim_layout"); + + case ISL_DIM_LAYOUT_GEN9_1D: + case ISL_DIM_LAYOUT_GEN4_2D: + *phys_level0_sa = (struct isl_extent4d) { + .w = info->width, + .h = 1, + .d = 1, + .a = info->array_len, + }; + break; + } + break; + + case ISL_SURF_DIM_2D: + assert(dim_layout == ISL_DIM_LAYOUT_GEN4_2D); + + if (tiling == ISL_TILING_Ys && info->samples > 1) + isl_finishme("%s:%s: multisample TileYs layout", __FILE__, __func__); + + switch (msaa_layout) { + case ISL_MSAA_LAYOUT_NONE: + assert(info->depth == 1); + assert(info->samples == 1); + + *phys_level0_sa = (struct isl_extent4d) { + .w = isl_align(info->width, fmtl->bw), + .h = isl_align(info->height, fmtl->bh), + .d = 1, + .a = info->array_len, + }; + break; + + case ISL_MSAA_LAYOUT_ARRAY: + assert(info->depth == 1); + assert(info->array_len == 1); + assert(!isl_format_is_compressed(info->format)); + + *phys_level0_sa = (struct isl_extent4d) { + .w = info->width, + .h = info->height, + .d = 1, + .a = info->samples, + }; + break; + + case ISL_MSAA_LAYOUT_INTERLEAVED: + assert(info->depth == 1); + assert(info->array_len == 1); + assert(!isl_format_is_compressed(info->format)); + + *phys_level0_sa = (struct isl_extent4d) { + .w = info->width, + .h = info->height, + .d = 1, + .a = 1, + }; + + isl_msaa_interleaved_scale_px_to_sa(info->samples, + &phys_level0_sa->w, + &phys_level0_sa->h); + break; + } + break; + + case ISL_SURF_DIM_3D: + assert(info->array_len == 1); + assert(info->samples == 1); + + if (fmtl->bd > 1) { + isl_finishme("%s:%s: compression block with depth > 1", + __FILE__, __func__); + } + + switch (dim_layout) { + case ISL_DIM_LAYOUT_GEN9_1D: + unreachable("bad isl_dim_layout"); + + case ISL_DIM_LAYOUT_GEN4_2D: + assert(ISL_DEV_GEN(dev) >= 9); + + *phys_level0_sa = (struct isl_extent4d) { + .w = isl_align(info->width, fmtl->bw), + .h = isl_align(info->height, fmtl->bh), + .d = 1, + .a = info->depth, + }; + break; + + case ISL_DIM_LAYOUT_GEN4_3D: + assert(ISL_DEV_GEN(dev) < 9); + *phys_level0_sa = (struct isl_extent4d) { + .w = isl_align(info->width, fmtl->bw), + .h = isl_align(info->height, fmtl->bh), + .d = info->depth, + .a = 1, + }; + break; + } + break; + } +} + +/** + * A variant of isl_calc_phys_slice0_extent_sa() specific to + * ISL_DIM_LAYOUT_GEN4_2D. + */ +static void +isl_calc_phys_slice0_extent_sa_gen4_2d( + const struct isl_device *dev, + const struct isl_surf_init_info *restrict info, + enum isl_msaa_layout msaa_layout, + const struct isl_extent3d *image_align_sa, + const struct isl_extent4d *phys_level0_sa, + struct isl_extent2d *phys_slice0_sa) +{ + const struct isl_format_layout *fmtl = isl_format_get_layout(info->format); + + assert(phys_level0_sa->depth == 1); + + if (info->levels == 1 && msaa_layout != ISL_MSAA_LAYOUT_INTERLEAVED) { + /* Do not pad the surface to the image alignment. Instead, pad it only + * to the pixel format's block alignment. + * + * For tiled surfaces, using a reduced alignment here avoids wasting CPU + * cycles on the below mipmap layout caluclations. Reducing the + * alignment here is safe because we later align the row pitch and array + * pitch to the tile boundary. It is safe even for + * ISL_MSAA_LAYOUT_INTERLEAVED, because phys_level0_sa is already scaled + * to accomodate the interleaved samples. + * + * For linear surfaces, reducing the alignment here permits us to later + * choose an arbitrary, non-aligned row pitch. If the surface backs + * a VkBuffer, then an arbitrary pitch may be needed to accomodate + * VkBufferImageCopy::bufferRowLength. + */ + *phys_slice0_sa = (struct isl_extent2d) { + .w = isl_align_npot(phys_level0_sa->w, fmtl->bw), + .h = isl_align_npot(phys_level0_sa->h, fmtl->bh), + }; + return; + } + + uint32_t slice_top_w = 0; + uint32_t slice_bottom_w = 0; + uint32_t slice_left_h = 0; + uint32_t slice_right_h = 0; + + uint32_t W0 = phys_level0_sa->w; + uint32_t H0 = phys_level0_sa->h; + + for (uint32_t l = 0; l < info->levels; ++l) { + uint32_t W = isl_minify(W0, l); + uint32_t H = isl_minify(H0, l); + + if (msaa_layout == ISL_MSAA_LAYOUT_INTERLEAVED) { + /* From the Broadwell PRM >> Volume 5: Memory Views >> Computing Mip Level + * Sizes (p133): + * + * If the surface is multisampled and it is a depth or stencil + * surface or Multisampled Surface StorageFormat in + * SURFACE_STATE is MSFMT_DEPTH_STENCIL, W_L and H_L must be + * adjusted as follows before proceeding: [...] + */ + isl_msaa_interleaved_scale_px_to_sa(info->samples, &W, &H); + } + + uint32_t w = isl_align_npot(W, image_align_sa->w); + uint32_t h = isl_align_npot(H, image_align_sa->h); + + if (l == 0) { + slice_top_w = w; + slice_left_h = h; + slice_right_h = h; + } else if (l == 1) { + slice_bottom_w = w; + slice_left_h += h; + } else if (l == 2) { + slice_bottom_w += w; + slice_right_h += h; + } else { + slice_right_h += h; + } + } + + *phys_slice0_sa = (struct isl_extent2d) { + .w = MAX(slice_top_w, slice_bottom_w), + .h = MAX(slice_left_h, slice_right_h), + }; +} + +/** + * A variant of isl_calc_phys_slice0_extent_sa() specific to + * ISL_DIM_LAYOUT_GEN4_3D. + */ +static void +isl_calc_phys_slice0_extent_sa_gen4_3d( + const struct isl_device *dev, + const struct isl_surf_init_info *restrict info, + const struct isl_extent3d *image_align_sa, + const struct isl_extent4d *phys_level0_sa, + struct isl_extent2d *phys_slice0_sa) +{ + assert(info->samples == 1); + assert(phys_level0_sa->array_len == 1); + + uint32_t slice_w = 0; + uint32_t slice_h = 0; + + uint32_t W0 = phys_level0_sa->w; + uint32_t H0 = phys_level0_sa->h; + uint32_t D0 = phys_level0_sa->d; + + for (uint32_t l = 0; l < info->levels; ++l) { + uint32_t level_w = isl_align_npot(isl_minify(W0, l), image_align_sa->w); + uint32_t level_h = isl_align_npot(isl_minify(H0, l), image_align_sa->h); + uint32_t level_d = isl_align_npot(isl_minify(D0, l), image_align_sa->d); + + uint32_t max_layers_horiz = MIN(level_d, 1u << l); + uint32_t max_layers_vert = isl_align(level_d, 1u << l) / (1u << l); + + slice_w = MAX(slice_w, level_w * max_layers_horiz); + slice_h += level_h * max_layers_vert; + } + + *phys_slice0_sa = (struct isl_extent2d) { + .w = slice_w, + .h = slice_h, + }; +} + +/** + * A variant of isl_calc_phys_slice0_extent_sa() specific to + * ISL_DIM_LAYOUT_GEN9_1D. + */ +static void +isl_calc_phys_slice0_extent_sa_gen9_1d( + const struct isl_device *dev, + const struct isl_surf_init_info *restrict info, + const struct isl_extent3d *image_align_sa, + const struct isl_extent4d *phys_level0_sa, + struct isl_extent2d *phys_slice0_sa) +{ + const struct isl_format_layout *fmtl = isl_format_get_layout(info->format); + + assert(phys_level0_sa->height == 1); + assert(phys_level0_sa->depth == 1); + assert(info->samples == 1); + assert(image_align_sa->w >= fmtl->bw); + + uint32_t slice_w = 0; + const uint32_t W0 = phys_level0_sa->w; + + for (uint32_t l = 0; l < info->levels; ++l) { + uint32_t W = isl_minify(W0, l); + uint32_t w = isl_align_npot(W, image_align_sa->w); + + slice_w += w; + } + + *phys_slice0_sa = isl_extent2d(slice_w, 1); +} + +/** + * Calculate the physical extent of the surface's first array slice, in units + * of surface samples. If the surface is multi-leveled, then the result will + * be aligned to \a image_align_sa. + */ +static void +isl_calc_phys_slice0_extent_sa(const struct isl_device *dev, + const struct isl_surf_init_info *restrict info, + enum isl_dim_layout dim_layout, + enum isl_msaa_layout msaa_layout, + const struct isl_extent3d *image_align_sa, + const struct isl_extent4d *phys_level0_sa, + struct isl_extent2d *phys_slice0_sa) +{ + switch (dim_layout) { + case ISL_DIM_LAYOUT_GEN9_1D: + isl_calc_phys_slice0_extent_sa_gen9_1d(dev, info, + image_align_sa, phys_level0_sa, + phys_slice0_sa); + return; + case ISL_DIM_LAYOUT_GEN4_2D: + isl_calc_phys_slice0_extent_sa_gen4_2d(dev, info, msaa_layout, + image_align_sa, phys_level0_sa, + phys_slice0_sa); + return; + case ISL_DIM_LAYOUT_GEN4_3D: + isl_calc_phys_slice0_extent_sa_gen4_3d(dev, info, image_align_sa, + phys_level0_sa, phys_slice0_sa); + return; + } +} + +/** + * Calculate the pitch between physical array slices, in units of rows of + * surface elements. + */ +static uint32_t +isl_calc_array_pitch_el_rows(const struct isl_device *dev, + const struct isl_surf_init_info *restrict info, + const struct isl_tile_info *tile_info, + enum isl_dim_layout dim_layout, + enum isl_array_pitch_span array_pitch_span, + const struct isl_extent3d *image_align_sa, + const struct isl_extent4d *phys_level0_sa, + const struct isl_extent2d *phys_slice0_sa) +{ + const struct isl_format_layout *fmtl = isl_format_get_layout(info->format); + uint32_t pitch_sa_rows = 0; + + switch (dim_layout) { + case ISL_DIM_LAYOUT_GEN9_1D: + /* Each row is an array slice */ + pitch_sa_rows = 1; + break; + case ISL_DIM_LAYOUT_GEN4_2D: + switch (array_pitch_span) { + case ISL_ARRAY_PITCH_SPAN_COMPACT: + pitch_sa_rows = isl_align_npot(phys_slice0_sa->h, image_align_sa->h); + break; + case ISL_ARRAY_PITCH_SPAN_FULL: { + /* The QPitch equation is found in the Broadwell PRM >> Volume 5: + * Memory Views >> Common Surface Formats >> Surface Layout >> 2D + * Surfaces >> Surface Arrays. + */ + uint32_t H0_sa = phys_level0_sa->h; + uint32_t H1_sa = isl_minify(H0_sa, 1); + + uint32_t h0_sa = isl_align_npot(H0_sa, image_align_sa->h); + uint32_t h1_sa = isl_align_npot(H1_sa, image_align_sa->h); + + uint32_t m; + if (ISL_DEV_GEN(dev) >= 7) { + /* The QPitch equation changed slightly in Ivybridge. */ + m = 12; + } else { + m = 11; + } + + pitch_sa_rows = h0_sa + h1_sa + (m * image_align_sa->h); + + if (ISL_DEV_GEN(dev) == 6 && info->samples > 1 && + (info->height % 4 == 1)) { + /* [SNB] Errata from the Sandy Bridge PRM >> Volume 4 Part 1: + * Graphics Core >> Section 7.18.3.7: Surface Arrays: + * + * [SNB] Errata: Sampler MSAA Qpitch will be 4 greater than + * the value calculated in the equation above , for every + * other odd Surface Height starting from 1 i.e. 1,5,9,13. + * + * XXX(chadv): Is the errata natural corollary of the physical + * layout of interleaved samples? + */ + pitch_sa_rows += 4; + } + + pitch_sa_rows = isl_align_npot(pitch_sa_rows, fmtl->bh); + } /* end case */ + break; + } + break; + case ISL_DIM_LAYOUT_GEN4_3D: + assert(array_pitch_span == ISL_ARRAY_PITCH_SPAN_COMPACT); + pitch_sa_rows = isl_align_npot(phys_slice0_sa->h, image_align_sa->h); + break; + default: + unreachable("bad isl_dim_layout"); + break; + } + + assert(pitch_sa_rows % fmtl->bh == 0); + uint32_t pitch_el_rows = pitch_sa_rows / fmtl->bh; + + if (ISL_DEV_GEN(dev) >= 9 && + info->dim == ISL_SURF_DIM_3D && + tile_info->tiling != ISL_TILING_LINEAR) { + /* From the Skylake BSpec >> RENDER_SURFACE_STATE >> Surface QPitch: + * + * Tile Mode != Linear: This field must be set to an integer multiple + * of the tile height + */ + pitch_el_rows = isl_align(pitch_el_rows, tile_info->height); + } + + return pitch_el_rows; +} + +/** + * Calculate the pitch of each surface row, in bytes. + */ +static uint32_t +isl_calc_row_pitch(const struct isl_device *dev, + const struct isl_surf_init_info *restrict info, + const struct isl_tile_info *tile_info, + const struct isl_extent3d *image_align_sa, + const struct isl_extent2d *phys_slice0_sa) +{ + const struct isl_format_layout *fmtl = isl_format_get_layout(info->format); + + uint32_t row_pitch = info->min_pitch; + + /* First, align the surface to a cache line boundary, as the PRM explains + * below. + * + * From the Broadwell PRM >> Volume 5: Memory Views >> Common Surface + * Formats >> Surface Padding Requirements >> Render Target and Media + * Surfaces: + * + * The data port accesses data (pixels) outside of the surface if they + * are contained in the same cache request as pixels that are within the + * surface. These pixels will not be returned by the requesting message, + * however if these pixels lie outside of defined pages in the GTT, + * a GTT error will result when the cache request is processed. In order + * to avoid these GTT errors, “padding” at the bottom of the surface is + * sometimes necessary. + * + * From the Broadwell PRM >> Volume 5: Memory Views >> Common Surface + * Formats >> Surface Padding Requirements >> Sampling Engine Surfaces: + * + * The sampling engine accesses texels outside of the surface if they + * are contained in the same cache line as texels that are within the + * surface. These texels will not participate in any calculation + * performed by the sampling engine and will not affect the result of + * any sampling engine operation, however if these texels lie outside of + * defined pages in the GTT, a GTT error will result when the cache line + * is accessed. In order to avoid these GTT errors, “padding” at the + * bottom and right side of a sampling engine surface is sometimes + * necessary. + * + * It is possible that a cache line will straddle a page boundary if the + * base address or pitch is not aligned. All pages included in the cache + * lines that are part of the surface must map to valid GTT entries to + * avoid errors. To determine the necessary padding on the bottom and + * right side of the surface, refer to the table in Alignment Unit Size + * section for the i and j parameters for the surface format in use. The + * surface must then be extended to the next multiple of the alignment + * unit size in each dimension, and all texels contained in this + * extended surface must have valid GTT entries. + * + * For example, suppose the surface size is 15 texels by 10 texels and + * the alignment parameters are i=4 and j=2. In this case, the extended + * surface would be 16 by 10. Note that these calculations are done in + * texels, and must be converted to bytes based on the surface format + * being used to determine whether additional pages need to be defined. + */ + assert(phys_slice0_sa->w % fmtl->bw == 0); + row_pitch = MAX(row_pitch, fmtl->bs * (phys_slice0_sa->w / fmtl->bw)); + + switch (tile_info->tiling) { + case ISL_TILING_LINEAR: + /* From the Broadwel PRM >> Volume 2d: Command Reference: Structures >> + * RENDER_SURFACE_STATE Surface Pitch (p349): + * + * - For linear render target surfaces and surfaces accessed with the + * typed data port messages, the pitch must be a multiple of the + * element size for non-YUV surface formats. Pitch must be + * a multiple of 2 * element size for YUV surface formats. + * + * - [Requirements for SURFTYPE_BUFFER and SURFTYPE_STRBUF, which we + * ignore because isl doesn't do buffers.] + * + * - For other linear surfaces, the pitch can be any multiple of + * bytes. + */ + if (info->usage & ISL_SURF_USAGE_RENDER_TARGET_BIT) { + if (isl_format_is_yuv(info->format)) { + row_pitch = isl_align_npot(row_pitch, 2 * fmtl->bs); + } else { + row_pitch = isl_align_npot(row_pitch, fmtl->bs); + } + } + break; + default: + /* From the Broadwel PRM >> Volume 2d: Command Reference: Structures >> + * RENDER_SURFACE_STATE Surface Pitch (p349): + * + * - For tiled surfaces, the pitch must be a multiple of the tile + * width. + */ + row_pitch = isl_align(row_pitch, tile_info->width); + break; + } + + return row_pitch; +} + +/** + * Calculate the surface's total height, including padding, in units of + * surface elements. + */ +static uint32_t +isl_calc_total_height_el(const struct isl_device *dev, + const struct isl_surf_init_info *restrict info, + const struct isl_tile_info *tile_info, + uint32_t phys_array_len, + uint32_t row_pitch, + uint32_t array_pitch_el_rows) +{ + const struct isl_format_layout *fmtl = isl_format_get_layout(info->format); + + uint32_t total_h_el = phys_array_len * array_pitch_el_rows; + uint32_t pad_bytes = 0; + + /* From the Broadwell PRM >> Volume 5: Memory Views >> Common Surface + * Formats >> Surface Padding Requirements >> Render Target and Media + * Surfaces: + * + * The data port accesses data (pixels) outside of the surface if they + * are contained in the same cache request as pixels that are within the + * surface. These pixels will not be returned by the requesting message, + * however if these pixels lie outside of defined pages in the GTT, + * a GTT error will result when the cache request is processed. In + * order to avoid these GTT errors, “padding” at the bottom of the + * surface is sometimes necessary. + * + * From the Broadwell PRM >> Volume 5: Memory Views >> Common Surface + * Formats >> Surface Padding Requirements >> Sampling Engine Surfaces: + * + * ... Lots of padding requirements, all listed separately below. + */ + + /* We can safely ignore the first padding requirement, quoted below, + * because isl doesn't do buffers. + * + * - [pre-BDW] For buffers, which have no inherent “height,” padding + * requirements are different. A buffer must be padded to the next + * multiple of 256 array elements, with an additional 16 bytes added + * beyond that to account for the L1 cache line. + */ + + /* + * - For compressed textures [...], padding at the bottom of the surface + * is to an even compressed row. + */ + if (isl_format_is_compressed(info->format)) + total_h_el = isl_align(total_h_el, 2); + + /* + * - For cube surfaces, an additional two rows of padding are required + * at the bottom of the surface. + */ + if (info->usage & ISL_SURF_USAGE_CUBE_BIT) + total_h_el += 2; + + /* + * - For packed YUV, 96 bpt, 48 bpt, and 24 bpt surface formats, + * additional padding is required. These surfaces require an extra row + * plus 16 bytes of padding at the bottom in addition to the general + * padding requirements. + */ + if (isl_format_is_yuv(info->format) && + (fmtl->bs == 96 || fmtl->bs == 48|| fmtl->bs == 24)) { + total_h_el += 1; + pad_bytes += 16; + } + + /* + * - For linear surfaces, additional padding of 64 bytes is required at + * the bottom of the surface. This is in addition to the padding + * required above. + */ + if (tile_info->tiling == ISL_TILING_LINEAR) + pad_bytes += 64; + + /* The below text weakens, not strengthens, the padding requirements for + * linear surfaces. Therefore we can safely ignore it. + * + * - [BDW+] For SURFTYPE_BUFFER, SURFTYPE_1D, and SURFTYPE_2D non-array, + * non-MSAA, non-mip-mapped surfaces in linear memory, the only + * padding requirement is to the next aligned 64-byte boundary beyond + * the end of the surface. The rest of the padding requirements + * documented above do not apply to these surfaces. + */ + + /* + * - [SKL+] For SURFTYPE_2D and SURFTYPE_3D with linear mode and + * height % 4 != 0, the surface must be padded with + * 4-(height % 4)*Surface Pitch # of bytes. + */ + if (ISL_DEV_GEN(dev) >= 9 && + tile_info->tiling == ISL_TILING_LINEAR && + (info->dim == ISL_SURF_DIM_2D || info->dim == ISL_SURF_DIM_3D)) { + total_h_el = isl_align(total_h_el, 4); + } + + /* + * - [SKL+] For SURFTYPE_1D with linear mode, the surface must be padded + * to 4 times the Surface Pitch # of bytes + */ + if (ISL_DEV_GEN(dev) >= 9 && + tile_info->tiling == ISL_TILING_LINEAR && + info->dim == ISL_SURF_DIM_1D) { + total_h_el += 4; + } + + /* Be sloppy. Align any leftover padding to a row boundary. */ + total_h_el += isl_align_div_npot(pad_bytes, row_pitch); + + return total_h_el; +} + +bool +isl_surf_init_s(const struct isl_device *dev, + struct isl_surf *surf, + const struct isl_surf_init_info *restrict info) +{ + const struct isl_format_layout *fmtl = isl_format_get_layout(info->format); + + const struct isl_extent4d logical_level0_px = { + .w = info->width, + .h = info->height, + .d = info->depth, + .a = info->array_len, + }; + + enum isl_dim_layout dim_layout = + isl_surf_choose_dim_layout(dev, info->dim); + + enum isl_tiling tiling; + if (!isl_surf_choose_tiling(dev, info, &tiling)) + return false; + + struct isl_tile_info tile_info; + if (!isl_tiling_get_info(dev, tiling, fmtl->bs, &tile_info)) + return false; + + enum isl_msaa_layout msaa_layout; + if (!isl_choose_msaa_layout(dev, info, tiling, &msaa_layout)) + return false; + + struct isl_extent3d image_align_el; + isl_choose_image_alignment_el(dev, info, tiling, msaa_layout, + &image_align_el); + + struct isl_extent3d image_align_sa = + isl_extent3d_el_to_sa(info->format, image_align_el); + + struct isl_extent4d phys_level0_sa; + isl_calc_phys_level0_extent_sa(dev, info, dim_layout, tiling, msaa_layout, + &phys_level0_sa); + assert(phys_level0_sa.w % fmtl->bw == 0); + assert(phys_level0_sa.h % fmtl->bh == 0); + + enum isl_array_pitch_span array_pitch_span = + isl_choose_array_pitch_span(dev, info, dim_layout, &phys_level0_sa); + + struct isl_extent2d phys_slice0_sa; + isl_calc_phys_slice0_extent_sa(dev, info, dim_layout, msaa_layout, + &image_align_sa, &phys_level0_sa, + &phys_slice0_sa); + assert(phys_slice0_sa.w % fmtl->bw == 0); + assert(phys_slice0_sa.h % fmtl->bh == 0); + + const uint32_t row_pitch = isl_calc_row_pitch(dev, info, &tile_info, + &image_align_sa, + &phys_slice0_sa); + + const uint32_t array_pitch_el_rows = + isl_calc_array_pitch_el_rows(dev, info, &tile_info, dim_layout, + array_pitch_span, &image_align_sa, + &phys_level0_sa, &phys_slice0_sa); + + const uint32_t total_h_el = + isl_calc_total_height_el(dev, info, &tile_info, + phys_level0_sa.array_len, row_pitch, + array_pitch_el_rows); + + const uint32_t total_h_sa = total_h_el * fmtl->bh; + const uint32_t size = row_pitch * isl_align(total_h_sa, tile_info.height); + + /* Alignment of surface base address, in bytes */ + uint32_t base_alignment = MAX(1, info->min_alignment); + assert(isl_is_pow2(base_alignment) && isl_is_pow2(tile_info.size)); + base_alignment = MAX(base_alignment, tile_info.size); + + *surf = (struct isl_surf) { + .dim = info->dim, + .dim_layout = dim_layout, + .msaa_layout = msaa_layout, + .tiling = tiling, + .format = info->format, + + .levels = info->levels, + .samples = info->samples, + + .image_alignment_el = image_align_el, + .logical_level0_px = logical_level0_px, + .phys_level0_sa = phys_level0_sa, + + .size = size, + .alignment = base_alignment, + .row_pitch = row_pitch, + .array_pitch_el_rows = array_pitch_el_rows, + .array_pitch_span = array_pitch_span, + + .usage = info->usage, + }; + + return true; +} + +void +isl_surf_get_tile_info(const struct isl_device *dev, + const struct isl_surf *surf, + struct isl_tile_info *tile_info) +{ + const struct isl_format_layout *fmtl = isl_format_get_layout(surf->format); + isl_tiling_get_info(dev, surf->tiling, fmtl->bs, tile_info); +} + +/** + * A variant of isl_surf_get_image_offset_sa() specific to + * ISL_DIM_LAYOUT_GEN4_2D. + */ +static void +get_image_offset_sa_gen4_2d(const struct isl_surf *surf, + uint32_t level, uint32_t layer, + uint32_t *x_offset_sa, + uint32_t *y_offset_sa) +{ + assert(level < surf->levels); + assert(layer < surf->phys_level0_sa.array_len); + assert(surf->phys_level0_sa.depth == 1); + + const struct isl_extent3d image_align_sa = + isl_surf_get_image_alignment_sa(surf); + + const uint32_t W0 = surf->phys_level0_sa.width; + const uint32_t H0 = surf->phys_level0_sa.height; + + uint32_t x = 0; + uint32_t y = layer * isl_surf_get_array_pitch_sa_rows(surf); + + for (uint32_t l = 0; l < level; ++l) { + if (l == 1) { + uint32_t W = isl_minify(W0, l); + + if (surf->msaa_layout == ISL_MSAA_LAYOUT_INTERLEAVED) + isl_msaa_interleaved_scale_px_to_sa(surf->samples, &W, NULL); + + x += isl_align_npot(W, image_align_sa.w); + } else { + uint32_t H = isl_minify(H0, l); + + if (surf->msaa_layout == ISL_MSAA_LAYOUT_INTERLEAVED) + isl_msaa_interleaved_scale_px_to_sa(surf->samples, NULL, &H); + + y += isl_align_npot(H, image_align_sa.h); + } + } + + *x_offset_sa = x; + *y_offset_sa = y; +} + +/** + * A variant of isl_surf_get_image_offset_sa() specific to + * ISL_DIM_LAYOUT_GEN4_3D. + */ +static void +get_image_offset_sa_gen4_3d(const struct isl_surf *surf, + uint32_t level, uint32_t logical_z_offset_px, + uint32_t *x_offset_sa, + uint32_t *y_offset_sa) +{ + assert(level < surf->levels); + assert(logical_z_offset_px < isl_minify(surf->phys_level0_sa.depth, level)); + assert(surf->phys_level0_sa.array_len == 1); + + const struct isl_extent3d image_align_sa = + isl_surf_get_image_alignment_sa(surf); + + const uint32_t W0 = surf->phys_level0_sa.width; + const uint32_t H0 = surf->phys_level0_sa.height; + const uint32_t D0 = surf->phys_level0_sa.depth; + + uint32_t x = 0; + uint32_t y = 0; + + for (uint32_t l = 0; l < level; ++l) { + const uint32_t level_h = isl_align_npot(isl_minify(H0, l), image_align_sa.h); + const uint32_t level_d = isl_align_npot(isl_minify(D0, l), image_align_sa.d); + const uint32_t max_layers_vert = isl_align(level_d, 1u << l) / (1u << l); + + y += level_h * max_layers_vert; + } + + const uint32_t level_w = isl_align_npot(isl_minify(W0, level), image_align_sa.w); + const uint32_t level_h = isl_align_npot(isl_minify(H0, level), image_align_sa.h); + const uint32_t level_d = isl_align_npot(isl_minify(D0, level), image_align_sa.d); + + const uint32_t max_layers_horiz = MIN(level_d, 1u << level); + + x += level_w * (logical_z_offset_px % max_layers_horiz); + y += level_h * (logical_z_offset_px / max_layers_horiz); + + *x_offset_sa = x; + *y_offset_sa = y; +} + +/** + * A variant of isl_surf_get_image_offset_sa() specific to + * ISL_DIM_LAYOUT_GEN9_1D. + */ +static void +get_image_offset_sa_gen9_1d(const struct isl_surf *surf, + uint32_t level, uint32_t layer, + uint32_t *x_offset_sa, + uint32_t *y_offset_sa) +{ + assert(level < surf->levels); + assert(layer < surf->phys_level0_sa.array_len); + assert(surf->phys_level0_sa.height == 1); + assert(surf->phys_level0_sa.depth == 1); + assert(surf->samples == 1); + + const uint32_t W0 = surf->phys_level0_sa.width; + const struct isl_extent3d image_align_sa = + isl_surf_get_image_alignment_sa(surf); + + uint32_t x = 0; + + for (uint32_t l = 0; l < level; ++l) { + uint32_t W = isl_minify(W0, l); + uint32_t w = isl_align_npot(W, image_align_sa.w); + + x += w; + } + + *x_offset_sa = x; + *y_offset_sa = layer * isl_surf_get_array_pitch_sa_rows(surf); +} + +/** + * Calculate the offset, in units of surface samples, to a subimage in the + * surface. + * + * @invariant level < surface levels + * @invariant logical_array_layer < logical array length of surface + * @invariant logical_z_offset_px < logical depth of surface at level + */ +static void +get_image_offset_sa(const struct isl_surf *surf, + uint32_t level, + uint32_t logical_array_layer, + uint32_t logical_z_offset_px, + uint32_t *x_offset_sa, + uint32_t *y_offset_sa) +{ + assert(level < surf->levels); + assert(logical_array_layer < surf->logical_level0_px.array_len); + assert(logical_z_offset_px + < isl_minify(surf->logical_level0_px.depth, level)); + + switch (surf->dim_layout) { + case ISL_DIM_LAYOUT_GEN9_1D: + get_image_offset_sa_gen9_1d(surf, level, logical_array_layer, + x_offset_sa, y_offset_sa); + break; + case ISL_DIM_LAYOUT_GEN4_2D: + get_image_offset_sa_gen4_2d(surf, level, logical_array_layer + + logical_z_offset_px, + x_offset_sa, y_offset_sa); + break; + case ISL_DIM_LAYOUT_GEN4_3D: + get_image_offset_sa_gen4_3d(surf, level, logical_z_offset_px, + x_offset_sa, y_offset_sa); + break; + } +} + +void +isl_surf_get_image_offset_el(const struct isl_surf *surf, + uint32_t level, + uint32_t logical_array_layer, + uint32_t logical_z_offset_px, + uint32_t *x_offset_el, + uint32_t *y_offset_el) +{ + const struct isl_format_layout *fmtl = isl_format_get_layout(surf->format); + + assert(level < surf->levels); + assert(logical_array_layer < surf->logical_level0_px.array_len); + assert(logical_z_offset_px + < isl_minify(surf->logical_level0_px.depth, level)); + + uint32_t x_offset_sa, y_offset_sa; + get_image_offset_sa(surf, level, + logical_array_layer, + logical_z_offset_px, + &x_offset_sa, + &y_offset_sa); + + *x_offset_el = x_offset_sa / fmtl->bw; + *y_offset_el = y_offset_sa / fmtl->bh; +} + +void +isl_surf_get_image_intratile_offset_el(const struct isl_device *dev, + const struct isl_surf *surf, + uint32_t level, + uint32_t logical_array_layer, + uint32_t logical_z_offset, + uint32_t *base_address_offset, + uint32_t *x_offset_el, + uint32_t *y_offset_el) +{ + const struct isl_format_layout *fmtl = isl_format_get_layout(surf->format); + + struct isl_tile_info tile_info; + isl_surf_get_tile_info(dev, surf, &tile_info); + + uint32_t total_x_offset_el; + uint32_t total_y_offset_el; + isl_surf_get_image_offset_el(surf, level, + logical_array_layer, + logical_z_offset, + &total_x_offset_el, + &total_y_offset_el); + + uint32_t small_y_offset_el = total_y_offset_el % tile_info.height; + uint32_t big_y_offset_el = total_y_offset_el - small_y_offset_el; + uint32_t big_y_offset_B = big_y_offset_el * surf->row_pitch; + + uint32_t total_x_offset_B = total_x_offset_el * fmtl->bs; + uint32_t small_x_offset_B = total_x_offset_B % tile_info.width; + uint32_t small_x_offset_el = small_x_offset_B / fmtl->bs; + uint32_t big_x_offset_B = total_x_offset_B - small_x_offset_B; + + *base_address_offset = big_y_offset_B + big_x_offset_B; + *x_offset_el = small_x_offset_el; + *y_offset_el = small_y_offset_el; +} + +uint32_t +isl_surf_get_depth_format(const struct isl_device *dev, + const struct isl_surf *surf) +{ + /* Support for separate stencil buffers began in gen5. Support for + * interleaved depthstencil buffers ceased in gen7. The intermediate gens, + * those that supported separate and interleaved stencil, were gen5 and + * gen6. + * + * For a list of all available formats, see the Sandybridge PRM >> Volume + * 2 Part 1: 3D/Media - 3D Pipeline >> 3DSTATE_DEPTH_BUFFER >> Surface + * Format (p321). + */ + + bool has_stencil = surf->usage & ISL_SURF_USAGE_STENCIL_BIT; + + assert(surf->usage & ISL_SURF_USAGE_DEPTH_BIT); + + if (has_stencil) + assert(ISL_DEV_GEN(dev) < 7); + + switch (surf->format) { + default: + unreachable("bad isl depth format"); + case ISL_FORMAT_R32_FLOAT_X8X24_TYPELESS: + assert(ISL_DEV_GEN(dev) < 7); + return 0; /* D32_FLOAT_S8X24_UINT */ + case ISL_FORMAT_R32_FLOAT: + assert(!has_stencil); + return 1; /* D32_FLOAT */ + case ISL_FORMAT_R24_UNORM_X8_TYPELESS: + if (has_stencil) { + assert(ISL_DEV_GEN(dev) < 7); + return 2; /* D24_UNORM_S8_UINT */ + } else { + assert(ISL_DEV_GEN(dev) >= 5); + return 3; /* D24_UNORM_X8_UINT */ + } + case ISL_FORMAT_R16_UNORM: + assert(!has_stencil); + return 5; /* D16_UNORM */ + } +} |