src/panfrost/encoder/pan_texture.c

   1 /*
   2  * Copyright (C) 2008 VMware, Inc.
   3  * Copyright (C) 2014 Broadcom
   4  * Copyright (C) 2018-2019 Alyssa Rosenzweig
   5  * Copyright (C) 2019-2020 Collabora, Ltd.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the next
  15  * paragraph) shall be included in all copies or substantial portions of the
  16  * Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24  * SOFTWARE.
  25  *
  26  */
  27
  28 #include "util/macros.h"
  29 #include "util/u_math.h"
  30 #include "pan_texture.h"
  31
  32 /* Generates a texture descriptor. Ideally, descriptors are immutable after the
  33  * texture is created, so we can keep these hanging around in GPU memory in a
  34  * dedicated BO and not have to worry. In practice there are some minor gotchas
  35  * with this (the driver sometimes will change the format of a texture on the
  36  * fly for compression) but it's fast enough to just regenerate the descriptor
  37  * in those cases, rather than monkeypatching at drawtime.
  38  *
  39  * A texture descriptor consists of a 32-byte mali_texture_descriptor structure
  40  * followed by a variable number of pointers. Due to this variance and
  41  * potentially large size, we actually upload directly rather than returning
  42  * the descriptor. Whether the user does a copy themselves or not is irrelevant
  43  * to us here.
  44  */
  45
  46 /* Check if we need to set a custom stride by computing the "expected"
  47  * stride and comparing it to what the user actually wants. Only applies
  48  * to linear textures, since tiled/compressed textures have strict
  49  * alignment requirements for their strides as it is */
  50
  51 static bool
  52 panfrost_needs_explicit_stride(
  53                 struct panfrost_slice *slices,
  54                 uint16_t width,
  55                 unsigned first_level, unsigned last_level,
  56                 unsigned bytes_per_pixel)
  57 {
  58         for (unsigned l = first_level; l <= last_level; ++l) {
  59                 unsigned actual = slices[l].stride;
  60                 unsigned expected = u_minify(width, l) * bytes_per_pixel;
  61
  62                 if (actual != expected)
  63                         return true;
  64         }
  65
  66         return false;
  67 }
  68
  69 /* A Scalable Texture Compression (ASTC) corresponds to just a few texture type
  70  * in the hardware, but in fact can be parametrized to have various widths and
  71  * heights for the so-called "stretch factor". It turns out these parameters
  72  * are stuffed in the bottom bits of the payload pointers. This functions
  73  * computes these magic stuffing constants based on the ASTC format in use. The
  74  * constant in a given dimension is 3-bits, and two are stored side-by-side for
  75  * each active dimension.
  76  */
  77
  78 static unsigned
  79 panfrost_astc_stretch(unsigned dim)
  80 {
  81         assert(dim >= 4 && dim <= 12);
  82         return MIN2(dim, 11) - 4;
  83 }
  84
  85 /* Texture addresses are tagged with information about compressed formats.
  86  * AFBC uses a bit for whether the colorspace transform is enabled (RGB and
  87  * RGBA only).
  88  * For ASTC, this is a "stretch factor" encoding the block size. */
  89
  90 static unsigned
  91 panfrost_compression_tag(
  92                 const struct util_format_description *desc,
  93                 enum mali_format format, enum mali_texture_layout layout)
  94 {
  95         if (layout == MALI_TEXTURE_AFBC)
  96                 return desc->nr_channels >= 3;
  97         else if (format == MALI_ASTC_HDR_SUPP || format == MALI_ASTC_SRGB_SUPP)
  98                 return (panfrost_astc_stretch(desc->block.height) << 3) |
  99                         panfrost_astc_stretch(desc->block.width);
 100         else
 101                 return 0;
 102 }
 103
 104
 105 /* Cubemaps have 6 faces as "layers" in between each actual layer. We
 106  * need to fix this up. TODO: logic wrong in the asserted out cases ...
 107  * can they happen, perhaps from cubemap arrays? */
 108
 109 static void
 110 panfrost_adjust_cube_dimensions(
 111                 unsigned *first_face, unsigned *last_face,
 112                 unsigned *first_layer, unsigned *last_layer)
 113 {
 114         *first_face = *first_layer % 6;
 115         *last_face = *last_layer % 6;
 116         *first_layer /= 6;
 117         *last_layer /= 6;
 118
 119         assert((*first_layer == *last_layer) || (*first_face == 0 && *last_face == 5));
 120 }
 121
 122 /* Following the texture descriptor is a number of pointers. How many? */
 123
 124 static unsigned
 125 panfrost_texture_num_elements(
 126                 unsigned first_level, unsigned last_level,
 127                 unsigned first_layer, unsigned last_layer,
 128                 bool is_cube, bool manual_stride)
 129 {
 130         unsigned first_face  = 0, last_face = 0;
 131
 132         if (is_cube) {
 133                 panfrost_adjust_cube_dimensions(&first_face, &last_face,
 134                                 &first_layer, &last_layer);
 135         }
 136
 137         unsigned levels = 1 + last_level - first_level;
 138         unsigned layers = 1 + last_layer - first_layer;
 139         unsigned faces  = 1 + last_face  - first_face;
 140         unsigned num_elements = levels * layers * faces;
 141
 142         if (manual_stride)
 143                 num_elements *= 2;
 144
 145         return num_elements;
 146 }
 147
 148 /* Conservative estimate of the size of the texture payload a priori.
 149  * Average case, size equal to the actual size. Worst case, off by 2x (if
 150  * a manual stride is not needed on a linear texture). Returned value
 151  * must be greater than or equal to the actual size, so it's safe to use
 152  * as an allocation amount */
 153
 154 unsigned
 155 panfrost_estimate_texture_payload_size(
 156                 unsigned first_level, unsigned last_level,
 157                 unsigned first_layer, unsigned last_layer,
 158                 enum mali_texture_type type, enum mali_texture_layout layout)
 159 {
 160         /* Assume worst case */
 161         unsigned manual_stride = (layout == MALI_TEXTURE_LINEAR);
 162
 163         unsigned elements = panfrost_texture_num_elements(
 164                         first_level, last_level,
 165                         first_layer, last_layer,
 166                         type == MALI_TEX_CUBE, manual_stride);
 167
 168         return sizeof(mali_ptr) * elements;
 169 }
 170
 171 /* Bifrost requires a tile stride for tiled textures. This stride is computed
 172  * as (16 * bpp * width) assuming there is at least one tile (width >= 16).
 173  * Otherwise if height <= 16, the blob puts zero. Interactions with AFBC are
 174  * currently unknown.
 175  */
 176
 177 static unsigned
 178 panfrost_nonlinear_stride(enum mali_texture_layout layout,
 179                 unsigned bytes_per_pixel,
 180                 unsigned width,
 181                 unsigned height)
 182 {
 183         if (layout == MALI_TEXTURE_TILED) {
 184                 return (height <= 16) ? 0 : (16 * bytes_per_pixel * ALIGN_POT(width, 16));
 185         } else {
 186                 unreachable("TODO: AFBC on Bifrost");
 187         }
 188 }
 189
 190 static void
 191 panfrost_emit_texture_payload(
 192         mali_ptr *payload,
 193         const struct util_format_description *desc,
 194         enum mali_format mali_format,
 195         enum mali_texture_type type,
 196         enum mali_texture_layout layout,
 197         unsigned width, unsigned height,
 198         unsigned first_level, unsigned last_level,
 199         unsigned first_layer, unsigned last_layer,
 200         unsigned nr_samples,
 201         unsigned cube_stride,
 202         bool manual_stride,
 203         mali_ptr base,
 204         struct panfrost_slice *slices)
 205 {
 206         base |= panfrost_compression_tag(desc, mali_format, layout);
 207
 208         /* Inject the addresses in, interleaving array indices, mip levels,
 209          * cube faces, and strides in that order */
 210
 211         unsigned first_face  = 0, last_face = 0, face_mult = 1;
 212
 213         if (type == MALI_TEX_CUBE) {
 214                 face_mult = 6;
 215                 panfrost_adjust_cube_dimensions(&first_face, &last_face, &first_layer, &last_layer);
 216         }
 217
 218         nr_samples = MAX2(nr_samples, 1);
 219
 220         unsigned idx = 0;
 221
 222         for (unsigned w = first_layer; w <= last_layer; ++w) {
 223                 for (unsigned l = first_level; l <= last_level; ++l) {
 224                         for (unsigned f = first_face; f <= last_face; ++f) {
 225                                 for (unsigned s = 0; s < nr_samples; ++s) {
 226                                         payload[idx++] = base + panfrost_texture_offset(
 227                                                         slices, type == MALI_TEX_3D,
 228                                                         cube_stride, l, w * face_mult + f, s);
 229
 230                                         if (manual_stride) {
 231                                                 payload[idx++] = (layout == MALI_TEXTURE_LINEAR) ?
 232                                                         slices[l].stride :
 233                                                         panfrost_nonlinear_stride(layout,
 234                                                                         MAX2(desc->block.bits / 8, 1),
 235                                                                         u_minify(width, l),
 236                                                                         u_minify(height, l));
 237                                         }
 238                                 }
 239                         }
 240                 }
 241         }
 242 }
 243
 244 #define MALI_SWIZZLE_R001 \
 245         (MALI_CHANNEL_RED << 0) | \
 246         (MALI_CHANNEL_ZERO << 3) | \
 247         (MALI_CHANNEL_ZERO << 6) | \
 248         (MALI_CHANNEL_ONE << 9)
 249
 250 #define MALI_SWIZZLE_A001 \
 251         (MALI_CHANNEL_ALPHA << 0) | \
 252         (MALI_CHANNEL_ZERO << 3) | \
 253         (MALI_CHANNEL_ZERO << 6) | \
 254         (MALI_CHANNEL_ONE << 9)
 255
 256
 257 void
 258 panfrost_new_texture(
 259         void *out,
 260         uint16_t width, uint16_t height,
 261         uint16_t depth, uint16_t array_size,
 262         enum pipe_format format,
 263         enum mali_texture_type type,
 264         enum mali_texture_layout layout,
 265         unsigned first_level, unsigned last_level,
 266         unsigned first_layer, unsigned last_layer,
 267         unsigned nr_samples,
 268         unsigned cube_stride,
 269         unsigned swizzle,
 270         mali_ptr base,
 271         struct panfrost_slice *slices)
 272 {
 273         const struct util_format_description *desc =
 274                 util_format_description(format);
 275
 276         unsigned bytes_per_pixel = util_format_get_blocksize(format);
 277
 278         enum mali_format mali_format = panfrost_pipe_format_table[desc->format].hw;
 279         assert(mali_format);
 280
 281         bool manual_stride = (layout == MALI_TEXTURE_LINEAR)
 282                 && panfrost_needs_explicit_stride(slices, width,
 283                                 first_level, last_level, bytes_per_pixel);
 284
 285         struct mali_texture_descriptor descriptor = {
 286                 .width = MALI_POSITIVE(u_minify(width, first_level)),
 287                 .height = MALI_POSITIVE(u_minify(height, first_level)),
 288                 .depth = MALI_POSITIVE(u_minify(depth, first_level)),
 289                 .array_size = MALI_POSITIVE(array_size),
 290                 .format = {
 291                         .swizzle = (format == PIPE_FORMAT_X24S8_UINT) ?
 292                                 MALI_SWIZZLE_A001 :
 293                                 (format == PIPE_FORMAT_S8_UINT) ?
 294                                 MALI_SWIZZLE_R001 :
 295                                 panfrost_translate_swizzle_4(desc->swizzle),
 296                         .format = mali_format,
 297                         .srgb = (desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB),
 298                         .type = type,
 299                         .layout = layout,
 300                         .manual_stride = manual_stride,
 301                         .unknown2 = 1,
 302                 },
 303                 .levels = last_level - first_level,
 304                 .swizzle = swizzle
 305         };
 306
 307         memcpy(out, &descriptor, sizeof(descriptor));
 308
 309         mali_ptr *payload = (mali_ptr *) (out + sizeof(struct mali_texture_descriptor));
 310         panfrost_emit_texture_payload(
 311                 payload,
 312                 desc,
 313                 mali_format,
 314                 type,
 315                 layout,
 316                 width, height,
 317                 first_level, last_level,
 318                 first_layer, last_layer,
 319                 nr_samples,
 320                 cube_stride,
 321                 manual_stride,
 322                 base,
 323                 slices);
 324 }
 325
 326 void
 327 panfrost_new_texture_bifrost(
 328         struct bifrost_texture_descriptor *descriptor,
 329         uint16_t width, uint16_t height,
 330         uint16_t depth, uint16_t array_size,
 331         enum pipe_format format,
 332         enum mali_texture_type type,
 333         enum mali_texture_layout layout,
 334         unsigned first_level, unsigned last_level,
 335         unsigned first_layer, unsigned last_layer,
 336         unsigned nr_samples,
 337         unsigned cube_stride,
 338         unsigned swizzle,
 339         mali_ptr base,
 340         struct panfrost_slice *slices,
 341         struct panfrost_bo *payload)
 342 {
 343         const struct util_format_description *desc =
 344                 util_format_description(format);
 345
 346         enum mali_format mali_format = panfrost_pipe_format_table[desc->format].hw;
 347         assert(mali_format);
 348
 349         panfrost_emit_texture_payload(
 350                 (mali_ptr *) payload->cpu,
 351                 desc,
 352                 mali_format,
 353                 type,
 354                 layout,
 355                 width, height,
 356                 first_level, last_level,
 357                 first_layer, last_layer,
 358                 nr_samples,
 359                 cube_stride,
 360                 true, /* Stride explicit on Bifrost */
 361                 base,
 362                 slices);
 363
 364         descriptor->format_unk = 0x2;
 365         descriptor->type = type;
 366         descriptor->format = mali_format;
 367         descriptor->srgb = (desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB);
 368         descriptor->format_unk3 = 0x0;
 369         descriptor->width = MALI_POSITIVE(u_minify(width, first_level));
 370         descriptor->height = MALI_POSITIVE(u_minify(height, first_level));
 371         descriptor->swizzle = swizzle;
 372         descriptor->layout = layout;
 373         descriptor->levels = last_level - first_level;
 374         descriptor->unk1 = 0x0;
 375         descriptor->levels_unk = 0;
 376         descriptor->level_2 = last_level - first_level;
 377         descriptor->payload = payload->gpu;
 378         descriptor->array_size = MALI_POSITIVE(array_size);
 379         descriptor->unk4 = 0x0;
 380         descriptor->depth = MALI_POSITIVE(u_minify(depth, first_level));
 381         descriptor->unk5 = 0x0;
 382 }
 383
 384 /* Computes sizes for checksumming, which is 8 bytes per 16x16 tile.
 385  * Checksumming is believed to be a CRC variant (CRC64 based on the size?).
 386  * This feature is also known as "transaction elimination". */
 387
 388 #define CHECKSUM_TILE_WIDTH 16
 389 #define CHECKSUM_TILE_HEIGHT 16
 390 #define CHECKSUM_BYTES_PER_TILE 8
 391
 392 unsigned
 393 panfrost_compute_checksum_size(
 394         struct panfrost_slice *slice,
 395         unsigned width,
 396         unsigned height)
 397 {
 398         unsigned aligned_width = ALIGN_POT(width, CHECKSUM_TILE_WIDTH);
 399         unsigned aligned_height = ALIGN_POT(height, CHECKSUM_TILE_HEIGHT);
 400
 401         unsigned tile_count_x = aligned_width / CHECKSUM_TILE_WIDTH;
 402         unsigned tile_count_y = aligned_height / CHECKSUM_TILE_HEIGHT;
 403
 404         slice->checksum_stride = tile_count_x * CHECKSUM_BYTES_PER_TILE;
 405
 406         return slice->checksum_stride * tile_count_y;
 407 }
 408
 409 unsigned
 410 panfrost_get_layer_stride(struct panfrost_slice *slices, bool is_3d, unsigned cube_stride, unsigned level)
 411 {
 412         return is_3d ? slices[level].size0 : cube_stride;
 413 }
 414
 415 /* Computes the offset into a texture at a particular level/face. Add to
 416  * the base address of a texture to get the address to that level/face */
 417
 418 unsigned
 419 panfrost_texture_offset(struct panfrost_slice *slices, bool is_3d, unsigned cube_stride, unsigned level, unsigned face, unsigned sample)
 420 {
 421         unsigned layer_stride = panfrost_get_layer_stride(slices, is_3d, cube_stride, level);
 422         return slices[level].offset + (face * layer_stride) + (sample * slices[level].size0);
 423 }