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 width < 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 {
 182         if (layout == MALI_TEXTURE_TILED) {
 183                 return (width < 16) ? 0 : (16 * bytes_per_pixel * ALIGN_POT(width, 16));
 184         } else {
 185                 unreachable("TODO: AFBC on Bifrost");
 186         }
 187 }
 188
 189 static void
 190 panfrost_emit_texture_payload(
 191         mali_ptr *payload,
 192         const struct util_format_description *desc,
 193         enum mali_format mali_format,
 194         enum mali_texture_type type,
 195         enum mali_texture_layout layout,
 196         unsigned width,
 197         unsigned first_level, unsigned last_level,
 198         unsigned first_layer, unsigned last_layer,
 199         unsigned cube_stride,
 200         bool manual_stride,
 201         mali_ptr base,
 202         struct panfrost_slice *slices)
 203 {
 204         base |= panfrost_compression_tag(desc, mali_format, layout);
 205
 206         /* Inject the addresses in, interleaving array indices, mip levels,
 207          * cube faces, and strides in that order */
 208
 209         unsigned first_face  = 0, last_face = 0, face_mult = 1;
 210
 211         if (type == MALI_TEX_CUBE) {
 212                 face_mult = 6;
 213                 panfrost_adjust_cube_dimensions(&first_face, &last_face, &first_layer, &last_layer);
 214         }
 215
 216         unsigned idx = 0;
 217
 218         for (unsigned w = first_layer; w <= last_layer; ++w) {
 219                 for (unsigned l = first_level; l <= last_level; ++l) {
 220                         for (unsigned f = first_face; f <= last_face; ++f) {
 221                                 payload[idx++] = base + panfrost_texture_offset(
 222                                                 slices, type == MALI_TEX_3D,
 223                                                 cube_stride, l, w * face_mult + f);
 224
 225                                 if (manual_stride) {
 226                                         payload[idx++] = (layout == MALI_TEXTURE_LINEAR) ?
 227                                                 slices[l].stride :
 228                                                 panfrost_nonlinear_stride(layout,
 229                                                                 MAX2(desc->block.bits / 8, 1),
 230                                                                 u_minify(width, l));
 231                                 }
 232                         }
 233                 }
 234         }
 235 }
 236
 237 void
 238 panfrost_new_texture(
 239         void *out,
 240         uint16_t width, uint16_t height,
 241         uint16_t depth, uint16_t array_size,
 242         enum pipe_format format,
 243         enum mali_texture_type type,
 244         enum mali_texture_layout layout,
 245         unsigned first_level, unsigned last_level,
 246         unsigned first_layer, unsigned last_layer,
 247         unsigned cube_stride,
 248         unsigned swizzle,
 249         mali_ptr base,
 250         struct panfrost_slice *slices)
 251 {
 252         const struct util_format_description *desc =
 253                 util_format_description(format);
 254
 255         unsigned bytes_per_pixel = util_format_get_blocksize(format);
 256
 257         enum mali_format mali_format = panfrost_pipe_format_table[desc->format].hw;
 258         assert(mali_format);
 259
 260         bool manual_stride = (layout == MALI_TEXTURE_LINEAR)
 261                 && panfrost_needs_explicit_stride(slices, width,
 262                                 first_level, last_level, bytes_per_pixel);
 263
 264         struct mali_texture_descriptor descriptor = {
 265                 .width = MALI_POSITIVE(u_minify(width, first_level)),
 266                 .height = MALI_POSITIVE(u_minify(height, first_level)),
 267                 .depth = MALI_POSITIVE(u_minify(depth, first_level)),
 268                 .array_size = MALI_POSITIVE(array_size),
 269                 .format = {
 270                         .swizzle = panfrost_translate_swizzle_4(desc->swizzle),
 271                         .format = mali_format,
 272                         .srgb = (desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB),
 273                         .type = type,
 274                         .layout = layout,
 275                         .manual_stride = manual_stride,
 276                         .unknown2 = 1,
 277                 },
 278                 .levels = last_level - first_level,
 279                 .swizzle = swizzle
 280         };
 281
 282         memcpy(out, &descriptor, sizeof(descriptor));
 283
 284         mali_ptr *payload = (mali_ptr *) (out + sizeof(struct mali_texture_descriptor));
 285         panfrost_emit_texture_payload(
 286                 payload,
 287                 desc,
 288                 mali_format,
 289                 type,
 290                 layout,
 291                 width,
 292                 first_level, last_level,
 293                 first_layer, last_layer,
 294                 cube_stride,
 295                 manual_stride,
 296                 base,
 297                 slices);
 298 }
 299
 300 void
 301 panfrost_new_texture_bifrost(
 302         struct bifrost_texture_descriptor *descriptor,
 303         uint16_t width, uint16_t height,
 304         uint16_t depth, uint16_t array_size,
 305         enum pipe_format format,
 306         enum mali_texture_type type,
 307         enum mali_texture_layout layout,
 308         unsigned first_level, unsigned last_level,
 309         unsigned first_layer, unsigned last_layer,
 310         unsigned cube_stride,
 311         unsigned swizzle,
 312         mali_ptr base,
 313         struct panfrost_slice *slices,
 314         struct panfrost_bo *payload)
 315 {
 316         const struct util_format_description *desc =
 317                 util_format_description(format);
 318
 319         enum mali_format mali_format = panfrost_pipe_format_table[desc->format].hw;
 320         assert(mali_format);
 321
 322         panfrost_emit_texture_payload(
 323                 (mali_ptr *) payload->cpu,
 324                 desc,
 325                 mali_format,
 326                 type,
 327                 layout,
 328                 width,
 329                 first_level, last_level,
 330                 first_layer, last_layer,
 331                 cube_stride,
 332                 true, /* Stride explicit on Bifrost */
 333                 base,
 334                 slices);
 335
 336         descriptor->format_unk = 0x2;
 337         descriptor->type = type;
 338         descriptor->format = mali_format;
 339         descriptor->srgb = (desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB);
 340         descriptor->format_unk3 = 0x0;
 341         descriptor->width = MALI_POSITIVE(u_minify(width, first_level));
 342         descriptor->height = MALI_POSITIVE(u_minify(height, first_level));
 343         descriptor->swizzle = swizzle;
 344         descriptor->layout = layout;
 345         descriptor->levels = last_level - first_level;
 346         descriptor->unk1 = 0x0;
 347         descriptor->levels_unk = 0;
 348         descriptor->level_2 = 0;
 349         descriptor->payload = payload->gpu;
 350         descriptor->array_size = MALI_POSITIVE(array_size);
 351         descriptor->unk4 = 0x0;
 352         descriptor->depth = MALI_POSITIVE(u_minify(depth, first_level));
 353         descriptor->unk5 = 0x0;
 354 }
 355
 356 /* Computes sizes for checksumming, which is 8 bytes per 16x16 tile.
 357  * Checksumming is believed to be a CRC variant (CRC64 based on the size?).
 358  * This feature is also known as "transaction elimination". */
 359
 360 #define CHECKSUM_TILE_WIDTH 16
 361 #define CHECKSUM_TILE_HEIGHT 16
 362 #define CHECKSUM_BYTES_PER_TILE 8
 363
 364 unsigned
 365 panfrost_compute_checksum_size(
 366         struct panfrost_slice *slice,
 367         unsigned width,
 368         unsigned height)
 369 {
 370         unsigned aligned_width = ALIGN_POT(width, CHECKSUM_TILE_WIDTH);
 371         unsigned aligned_height = ALIGN_POT(height, CHECKSUM_TILE_HEIGHT);
 372
 373         unsigned tile_count_x = aligned_width / CHECKSUM_TILE_WIDTH;
 374         unsigned tile_count_y = aligned_height / CHECKSUM_TILE_HEIGHT;
 375
 376         slice->checksum_stride = tile_count_x * CHECKSUM_BYTES_PER_TILE;
 377
 378         return slice->checksum_stride * tile_count_y;
 379 }
 380
 381 unsigned
 382 panfrost_get_layer_stride(struct panfrost_slice *slices, bool is_3d, unsigned cube_stride, unsigned level)
 383 {
 384         return is_3d ? slices[level].size0 : cube_stride;
 385 }
 386
 387 /* Computes the offset into a texture at a particular level/face. Add to
 388  * the base address of a texture to get the address to that level/face */
 389
 390 unsigned
 391 panfrost_texture_offset(struct panfrost_slice *slices, bool is_3d, unsigned cube_stride, unsigned level, unsigned face)
 392 {
 393         unsigned layer_stride = panfrost_get_layer_stride(slices, is_3d, cube_stride, level);
 394         return slices[level].offset + (face * layer_stride);
 395 }