src/gallium/drivers/vc4/vc4_resource.c

   1 /*
   2  * Copyright © 2014 Broadcom
   3  * Copyright (C) 2012 Rob Clark <robclark@freedesktop.org>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22  * IN THE SOFTWARE.
  23  */
  24
  25 #include "util/u_memory.h"
  26 #include "util/u_format.h"
  27 #include "util/u_inlines.h"
  28 #include "util/u_surface.h"
  29 #include "util/u_blitter.h"
  30
  31 #include "vc4_screen.h"
  32 #include "vc4_context.h"
  33 #include "vc4_resource.h"
  34 #include "vc4_tiling.h"
  35
  36 static void
  37 vc4_resource_bo_alloc(struct vc4_resource *rsc)
  38 {
  39         struct pipe_resource *prsc = &rsc->base.b;
  40         struct pipe_screen *pscreen = prsc->screen;
  41
  42         vc4_bo_unreference(&rsc->bo);
  43         rsc->bo = vc4_bo_alloc(vc4_screen(pscreen),
  44                                rsc->slices[0].offset +
  45                                rsc->slices[0].size +
  46                                rsc->cube_map_stride * (prsc->array_size - 1),
  47                                "resource");
  48 }
  49
  50 static void
  51 vc4_resource_transfer_unmap(struct pipe_context *pctx,
  52                             struct pipe_transfer *ptrans)
  53 {
  54         struct vc4_context *vc4 = vc4_context(pctx);
  55         struct vc4_transfer *trans = vc4_transfer(ptrans);
  56         struct pipe_resource *prsc = ptrans->resource;
  57         struct vc4_resource *rsc = vc4_resource(prsc);
  58         struct vc4_resource_slice *slice = &rsc->slices[ptrans->level];
  59
  60         if (trans->map) {
  61                 if (ptrans->usage & PIPE_TRANSFER_WRITE) {
  62                         vc4_store_tiled_image(rsc->bo->map + slice->offset +
  63                                               ptrans->box.z * rsc->cube_map_stride,
  64                                               slice->stride,
  65                                               trans->map, ptrans->stride,
  66                                               slice->tiling, rsc->cpp,
  67                                               &ptrans->box);
  68                 }
  69                 free(trans->map);
  70         }
  71
  72         pipe_resource_reference(&ptrans->resource, NULL);
  73         util_slab_free(&vc4->transfer_pool, ptrans);
  74 }
  75
  76 static void *
  77 vc4_resource_transfer_map(struct pipe_context *pctx,
  78                           struct pipe_resource *prsc,
  79                           unsigned level, unsigned usage,
  80                           const struct pipe_box *box,
  81                           struct pipe_transfer **pptrans)
  82 {
  83         struct vc4_context *vc4 = vc4_context(pctx);
  84         struct vc4_resource *rsc = vc4_resource(prsc);
  85         struct vc4_resource_slice *slice = &rsc->slices[level];
  86         struct vc4_transfer *trans;
  87         struct pipe_transfer *ptrans;
  88         enum pipe_format format = prsc->format;
  89         char *buf;
  90
  91         if (usage & PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE) {
  92                 vc4_resource_bo_alloc(rsc);
  93         } else if (!(usage & PIPE_TRANSFER_UNSYNCHRONIZED)) {
  94                 if (vc4_cl_references_bo(pctx, rsc->bo)) {
  95                         if ((usage & PIPE_TRANSFER_DISCARD_RANGE) &&
  96                             prsc->last_level == 0 &&
  97                             prsc->width0 == box->width &&
  98                             prsc->height0 == box->height &&
  99                             prsc->depth0 == box->depth) {
 100                                 vc4_resource_bo_alloc(rsc);
 101                         } else {
 102                                 vc4_flush(pctx);
 103                         }
 104                 }
 105         }
 106
 107         if (usage & PIPE_TRANSFER_WRITE)
 108                 rsc->writes++;
 109
 110         trans = util_slab_alloc(&vc4->transfer_pool);
 111         if (!trans)
 112                 return NULL;
 113
 114         /* XXX: Handle DONTBLOCK, DISCARD_RANGE, PERSISTENT, COHERENT. */
 115
 116         /* util_slab_alloc() doesn't zero: */
 117         memset(trans, 0, sizeof(*trans));
 118         ptrans = &trans->base;
 119
 120         pipe_resource_reference(&ptrans->resource, prsc);
 121         ptrans->level = level;
 122         ptrans->usage = usage;
 123         ptrans->box = *box;
 124
 125         /* Note that the current kernel implementation is synchronous, so no
 126          * need to do syncing stuff here yet.
 127          */
 128
 129         if (usage & PIPE_TRANSFER_UNSYNCHRONIZED)
 130                 buf = vc4_bo_map_unsynchronized(rsc->bo);
 131         else
 132                 buf = vc4_bo_map(rsc->bo);
 133         if (!buf) {
 134                 fprintf(stderr, "Failed to map bo\n");
 135                 goto fail;
 136         }
 137
 138         *pptrans = ptrans;
 139
 140         if (rsc->tiled) {
 141                 uint32_t utile_w = vc4_utile_width(rsc->cpp);
 142                 uint32_t utile_h = vc4_utile_height(rsc->cpp);
 143
 144                 /* No direct mappings of tiled, since we need to manually
 145                  * tile/untile.
 146                  */
 147                 if (usage & PIPE_TRANSFER_MAP_DIRECTLY)
 148                         return NULL;
 149
 150                 /* We need to align the box to utile boundaries, since that's
 151                  * what load/store operate on.
 152                  */
 153                 uint32_t box_start_x = ptrans->box.x & (utile_w - 1);
 154                 uint32_t box_start_y = ptrans->box.y & (utile_h - 1);
 155                 ptrans->box.width += box_start_x;
 156                 ptrans->box.x -= box_start_x;
 157                 ptrans->box.height += box_start_y;
 158                 ptrans->box.y -= box_start_y;
 159                 ptrans->box.width = align(ptrans->box.width, utile_w);
 160                 ptrans->box.height = align(ptrans->box.height, utile_h);
 161
 162                 ptrans->stride = ptrans->box.width * rsc->cpp;
 163                 ptrans->layer_stride = ptrans->stride;
 164
 165                 trans->map = malloc(ptrans->stride * ptrans->box.height);
 166                 if (usage & PIPE_TRANSFER_READ) {
 167                         vc4_load_tiled_image(trans->map, ptrans->stride,
 168                                              buf + slice->offset +
 169                                              box->z * rsc->cube_map_stride,
 170                                              slice->stride,
 171                                              slice->tiling, rsc->cpp,
 172                                              &ptrans->box);
 173                 }
 174                 return (trans->map +
 175                         box_start_x * rsc->cpp +
 176                         box_start_y * ptrans->stride);
 177         } else {
 178                 ptrans->stride = slice->stride;
 179                 ptrans->layer_stride = ptrans->stride;
 180
 181                 return buf + slice->offset +
 182                         box->y / util_format_get_blockheight(format) * ptrans->stride +
 183                         box->x / util_format_get_blockwidth(format) * rsc->cpp +
 184                         box->z * rsc->cube_map_stride;
 185         }
 186
 187
 188 fail:
 189         vc4_resource_transfer_unmap(pctx, ptrans);
 190         return NULL;
 191 }
 192
 193 static void
 194 vc4_resource_destroy(struct pipe_screen *pscreen,
 195                      struct pipe_resource *prsc)
 196 {
 197         struct vc4_resource *rsc = vc4_resource(prsc);
 198         pipe_resource_reference(&rsc->shadow_parent, NULL);
 199         vc4_bo_unreference(&rsc->bo);
 200         free(rsc);
 201 }
 202
 203 static boolean
 204 vc4_resource_get_handle(struct pipe_screen *pscreen,
 205                         struct pipe_resource *prsc,
 206                         struct winsys_handle *handle)
 207 {
 208         struct vc4_resource *rsc = vc4_resource(prsc);
 209
 210         return vc4_screen_bo_get_handle(pscreen, rsc->bo, rsc->slices[0].stride,
 211                                         handle);
 212 }
 213
 214 static const struct u_resource_vtbl vc4_resource_vtbl = {
 215         .resource_get_handle      = vc4_resource_get_handle,
 216         .resource_destroy         = vc4_resource_destroy,
 217         .transfer_map             = vc4_resource_transfer_map,
 218         .transfer_flush_region    = u_default_transfer_flush_region,
 219         .transfer_unmap           = vc4_resource_transfer_unmap,
 220         .transfer_inline_write    = u_default_transfer_inline_write,
 221 };
 222
 223 static void
 224 vc4_setup_slices(struct vc4_resource *rsc)
 225 {
 226         struct pipe_resource *prsc = &rsc->base.b;
 227         uint32_t width = prsc->width0;
 228         uint32_t height = prsc->height0;
 229         uint32_t pot_width = util_next_power_of_two(width);
 230         uint32_t pot_height = util_next_power_of_two(height);
 231         uint32_t offset = 0;
 232         uint32_t utile_w = vc4_utile_width(rsc->cpp);
 233         uint32_t utile_h = vc4_utile_height(rsc->cpp);
 234
 235         for (int i = prsc->last_level; i >= 0; i--) {
 236                 struct vc4_resource_slice *slice = &rsc->slices[i];
 237
 238                 uint32_t level_width, level_height;
 239                 if (i == 0) {
 240                         level_width = width;
 241                         level_height = height;
 242                 } else {
 243                         level_width = u_minify(pot_width, i);
 244                         level_height = u_minify(pot_height, i);
 245                 }
 246
 247                 if (rsc->tiled == VC4_TILING_FORMAT_LINEAR) {
 248                         slice->tiling = VC4_TILING_FORMAT_LINEAR;
 249                         level_width = align(level_width, 16);
 250                 } else {
 251                         if (vc4_size_is_lt(level_width, level_height,
 252                                            rsc->cpp)) {
 253                                 slice->tiling = VC4_TILING_FORMAT_LT;
 254                                 level_width = align(level_width, utile_w);
 255                                 level_height = align(level_height, utile_h);
 256                         } else {
 257                                 slice->tiling = VC4_TILING_FORMAT_T;
 258                                 level_width = align(level_width,
 259                                                     4 * 2 * utile_w);
 260                                 level_height = align(level_height,
 261                                                      4 * 2 * utile_h);
 262                         }
 263                 }
 264
 265                 slice->offset = offset;
 266                 slice->stride = level_width * rsc->cpp;
 267                 slice->size = level_height * slice->stride;
 268
 269                 offset += slice->size;
 270         }
 271
 272         /* The texture base pointer that has to point to level 0 doesn't have
 273          * intra-page bits, so we have to align it, and thus shift up all the
 274          * smaller slices.
 275          */
 276         uint32_t page_align_offset = (align(rsc->slices[0].offset, 4096) -
 277                                       rsc->slices[0].offset);
 278         if (page_align_offset) {
 279                 for (int i = 0; i <= prsc->last_level; i++)
 280                         rsc->slices[i].offset += page_align_offset;
 281         }
 282
 283         /* Cube map faces appear as whole miptrees at a page-aligned offset
 284          * from the first face's miptree.
 285          */
 286         if (prsc->target == PIPE_TEXTURE_CUBE) {
 287                 rsc->cube_map_stride = align(rsc->slices[0].offset +
 288                                              rsc->slices[0].size, 4096);
 289         }
 290 }
 291
 292 static struct vc4_resource *
 293 vc4_resource_setup(struct pipe_screen *pscreen,
 294                    const struct pipe_resource *tmpl)
 295 {
 296         struct vc4_resource *rsc = CALLOC_STRUCT(vc4_resource);
 297         if (!rsc)
 298                 return NULL;
 299         struct pipe_resource *prsc = &rsc->base.b;
 300
 301         *prsc = *tmpl;
 302
 303         pipe_reference_init(&prsc->reference, 1);
 304         prsc->screen = pscreen;
 305
 306         rsc->base.vtbl = &vc4_resource_vtbl;
 307         rsc->cpp = util_format_get_blocksize(tmpl->format);
 308
 309         assert(rsc->cpp);
 310
 311         return rsc;
 312 }
 313
 314 static enum vc4_texture_data_type
 315 get_resource_texture_format(struct pipe_resource *prsc)
 316 {
 317         struct vc4_resource *rsc = vc4_resource(prsc);
 318         uint8_t format = vc4_get_tex_format(prsc->format);
 319
 320         if (!rsc->tiled) {
 321                 assert(format == VC4_TEXTURE_TYPE_RGBA8888);
 322                 return VC4_TEXTURE_TYPE_RGBA32R;
 323         }
 324
 325         return format;
 326 }
 327
 328 struct pipe_resource *
 329 vc4_resource_create(struct pipe_screen *pscreen,
 330                     const struct pipe_resource *tmpl)
 331 {
 332         struct vc4_resource *rsc = vc4_resource_setup(pscreen, tmpl);
 333         struct pipe_resource *prsc = &rsc->base.b;
 334
 335         /* We have to make shared be untiled, since we don't have any way to
 336          * communicate metadata about tiling currently.
 337          */
 338         if (tmpl->target == PIPE_BUFFER ||
 339             (tmpl->bind & (PIPE_BIND_SCANOUT |
 340                            PIPE_BIND_LINEAR |
 341                            PIPE_BIND_SHARED |
 342                            PIPE_BIND_CURSOR))) {
 343                 rsc->tiled = false;
 344         } else {
 345                 rsc->tiled = true;
 346         }
 347
 348         vc4_setup_slices(rsc);
 349         vc4_resource_bo_alloc(rsc);
 350         if (!rsc->bo)
 351                 goto fail;
 352
 353         if (tmpl->target != PIPE_BUFFER)
 354                 rsc->vc4_format = get_resource_texture_format(prsc);
 355
 356         return prsc;
 357 fail:
 358         vc4_resource_destroy(pscreen, prsc);
 359         return NULL;
 360 }
 361
 362 static struct pipe_resource *
 363 vc4_resource_from_handle(struct pipe_screen *pscreen,
 364                          const struct pipe_resource *tmpl,
 365                          struct winsys_handle *handle)
 366 {
 367         struct vc4_resource *rsc = vc4_resource_setup(pscreen, tmpl);
 368         struct pipe_resource *prsc = &rsc->base.b;
 369         struct vc4_resource_slice *slice = &rsc->slices[0];
 370
 371         if (!rsc)
 372                 return NULL;
 373
 374         rsc->tiled = false;
 375         rsc->bo = vc4_screen_bo_from_handle(pscreen, handle, &slice->stride);
 376         if (!rsc->bo)
 377                 goto fail;
 378
 379 #ifdef USE_VC4_SIMULATOR
 380         slice->stride = align(prsc->width0 * rsc->cpp, 16);
 381 #endif
 382         slice->tiling = VC4_TILING_FORMAT_LINEAR;
 383
 384         rsc->vc4_format = get_resource_texture_format(prsc);
 385
 386         return prsc;
 387
 388 fail:
 389         vc4_resource_destroy(pscreen, prsc);
 390         return NULL;
 391 }
 392
 393 static struct pipe_surface *
 394 vc4_create_surface(struct pipe_context *pctx,
 395                    struct pipe_resource *ptex,
 396                    const struct pipe_surface *surf_tmpl)
 397 {
 398         struct vc4_surface *surface = CALLOC_STRUCT(vc4_surface);
 399         struct vc4_resource *rsc = vc4_resource(ptex);
 400
 401         if (!surface)
 402                 return NULL;
 403
 404         assert(surf_tmpl->u.tex.first_layer == surf_tmpl->u.tex.last_layer);
 405
 406         struct pipe_surface *psurf = &surface->base;
 407         unsigned level = surf_tmpl->u.tex.level;
 408
 409         pipe_reference_init(&psurf->reference, 1);
 410         pipe_resource_reference(&psurf->texture, ptex);
 411
 412         psurf->context = pctx;
 413         psurf->format = surf_tmpl->format;
 414         psurf->width = u_minify(ptex->width0, level);
 415         psurf->height = u_minify(ptex->height0, level);
 416         psurf->u.tex.level = level;
 417         psurf->u.tex.first_layer = surf_tmpl->u.tex.first_layer;
 418         psurf->u.tex.last_layer = surf_tmpl->u.tex.last_layer;
 419         surface->offset = rsc->slices[level].offset;
 420         surface->tiling = rsc->slices[level].tiling;
 421
 422         return &surface->base;
 423 }
 424
 425 static void
 426 vc4_surface_destroy(struct pipe_context *pctx, struct pipe_surface *psurf)
 427 {
 428         pipe_resource_reference(&psurf->texture, NULL);
 429         FREE(psurf);
 430 }
 431
 432 static void
 433 vc4_flush_resource(struct pipe_context *pctx, struct pipe_resource *resource)
 434 {
 435         struct vc4_context *vc4 = vc4_context(pctx);
 436
 437         /* XXX: Skip this if we don't have any queued drawing to it. */
 438         vc4->base.flush(pctx, NULL, 0);
 439 }
 440 static bool
 441 render_blit(struct pipe_context *ctx, struct pipe_blit_info *info)
 442 {
 443         struct vc4_context *vc4 = vc4_context(ctx);
 444
 445         if (!util_blitter_is_blit_supported(vc4->blitter, info)) {
 446                 fprintf(stderr, "blit unsupported %s -> %s",
 447                     util_format_short_name(info->src.resource->format),
 448                     util_format_short_name(info->dst.resource->format));
 449                 return false;
 450         }
 451
 452         util_blitter_save_vertex_buffer_slot(vc4->blitter, vc4->vertexbuf.vb);
 453         util_blitter_save_vertex_elements(vc4->blitter, vc4->vtx);
 454         util_blitter_save_vertex_shader(vc4->blitter, vc4->prog.bind_vs);
 455         util_blitter_save_rasterizer(vc4->blitter, vc4->rasterizer);
 456         util_blitter_save_viewport(vc4->blitter, &vc4->viewport);
 457         util_blitter_save_scissor(vc4->blitter, &vc4->scissor);
 458         util_blitter_save_fragment_shader(vc4->blitter, vc4->prog.bind_fs);
 459         util_blitter_save_blend(vc4->blitter, vc4->blend);
 460         util_blitter_save_depth_stencil_alpha(vc4->blitter, vc4->zsa);
 461         util_blitter_save_stencil_ref(vc4->blitter, &vc4->stencil_ref);
 462         util_blitter_save_sample_mask(vc4->blitter, vc4->sample_mask);
 463         util_blitter_save_framebuffer(vc4->blitter, &vc4->framebuffer);
 464         util_blitter_save_fragment_sampler_states(vc4->blitter,
 465                         vc4->fragtex.num_samplers,
 466                         (void **)vc4->fragtex.samplers);
 467         util_blitter_save_fragment_sampler_views(vc4->blitter,
 468                         vc4->fragtex.num_textures, vc4->fragtex.textures);
 469
 470         util_blitter_blit(vc4->blitter, info);
 471
 472         return true;
 473 }
 474
 475 /* Optimal hardware path for blitting pixels.
 476  * Scaling, format conversion, up- and downsampling (resolve) are allowed.
 477  */
 478 static void
 479 vc4_blit(struct pipe_context *pctx, const struct pipe_blit_info *blit_info)
 480 {
 481         struct pipe_blit_info info = *blit_info;
 482
 483         if (info.src.resource->nr_samples > 1 &&
 484             info.dst.resource->nr_samples <= 1 &&
 485             !util_format_is_depth_or_stencil(info.src.resource->format) &&
 486             !util_format_is_pure_integer(info.src.resource->format)) {
 487                 fprintf(stderr, "color resolve unimplemented");
 488                 return;
 489         }
 490
 491         if (util_try_blit_via_copy_region(pctx, &info)) {
 492                 return; /* done */
 493         }
 494
 495         if (info.mask & PIPE_MASK_S) {
 496                 fprintf(stderr, "cannot blit stencil, skipping");
 497                 info.mask &= ~PIPE_MASK_S;
 498         }
 499
 500         render_blit(pctx, &info);
 501 }
 502
 503 void
 504 vc4_update_shadow_baselevel_texture(struct pipe_context *pctx,
 505                                     struct pipe_sampler_view *view)
 506 {
 507         struct vc4_resource *shadow = vc4_resource(view->texture);
 508         struct vc4_resource *orig = vc4_resource(shadow->shadow_parent);
 509         assert(orig);
 510
 511         if (shadow->writes == orig->writes)
 512                 return;
 513
 514         for (int i = 0; i <= shadow->base.b.last_level; i++) {
 515                 struct pipe_box box = {
 516                         .x = 0,
 517                         .y = 0,
 518                         .z = 0,
 519                         .width = u_minify(shadow->base.b.width0, i),
 520                         .height = u_minify(shadow->base.b.height0, i),
 521                         .depth = 1,
 522                 };
 523
 524                 util_resource_copy_region(pctx,
 525                                           &shadow->base.b, i, 0, 0, 0,
 526                                           &orig->base.b,
 527                                           view->u.tex.first_level + i,
 528                                           &box);
 529         }
 530
 531         shadow->writes = orig->writes;
 532 }
 533
 534 /**
 535  * Converts a 4-byte index buffer to 2 bytes.
 536  *
 537  * Since GLES2 only has support for 1 and 2-byte indices, the hardware doesn't
 538  * include 4-byte index support, and we have to shrink it down.
 539  *
 540  * There's no fallback support for when indices end up being larger than 2^16,
 541  * though it will at least assertion fail.  Also, if the original index data
 542  * was in user memory, it would be nice to not have uploaded it to a VBO
 543  * before translating.
 544  */
 545 void
 546 vc4_update_shadow_index_buffer(struct pipe_context *pctx,
 547                                const struct pipe_index_buffer *ib)
 548 {
 549         struct vc4_resource *shadow = vc4_resource(ib->buffer);
 550         struct vc4_resource *orig = vc4_resource(shadow->shadow_parent);
 551         uint32_t count = shadow->base.b.width0 / 2;
 552
 553         if (shadow->writes == orig->writes)
 554                 return;
 555
 556         struct pipe_transfer *src_transfer;
 557         uint32_t *src = pipe_buffer_map_range(pctx, &orig->base.b,
 558                                               ib->offset,
 559                                               count * 4,
 560                                               PIPE_TRANSFER_READ, &src_transfer);
 561
 562         struct pipe_transfer *dst_transfer;
 563         uint16_t *dst = pipe_buffer_map_range(pctx, &shadow->base.b,
 564                                               0,
 565                                               count * 2,
 566                                               PIPE_TRANSFER_WRITE, &dst_transfer);
 567
 568         for (int i = 0; i < count; i++) {
 569                 uint32_t src_index = src[i];
 570                 assert(src_index <= 0xffff);
 571                 dst[i] = src_index;
 572         }
 573
 574         pctx->transfer_unmap(pctx, dst_transfer);
 575         pctx->transfer_unmap(pctx, src_transfer);
 576
 577         shadow->writes = orig->writes;
 578 }
 579
 580 void
 581 vc4_resource_screen_init(struct pipe_screen *pscreen)
 582 {
 583         pscreen->resource_create = vc4_resource_create;
 584         pscreen->resource_from_handle = vc4_resource_from_handle;
 585         pscreen->resource_get_handle = u_resource_get_handle_vtbl;
 586         pscreen->resource_destroy = u_resource_destroy_vtbl;
 587 }
 588
 589 void
 590 vc4_resource_context_init(struct pipe_context *pctx)
 591 {
 592         pctx->transfer_map = u_transfer_map_vtbl;
 593         pctx->transfer_flush_region = u_transfer_flush_region_vtbl;
 594         pctx->transfer_unmap = u_transfer_unmap_vtbl;
 595         pctx->transfer_inline_write = u_transfer_inline_write_vtbl;
 596         pctx->create_surface = vc4_create_surface;
 597         pctx->surface_destroy = vc4_surface_destroy;
 598         pctx->resource_copy_region = util_resource_copy_region;
 599         pctx->blit = vc4_blit;
 600         pctx->flush_resource = vc4_flush_resource;
 601 }