src/gallium/drivers/identity/id_context.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 #include "pipe/p_context.h"
  30 #include "util/u_memory.h"
  31
  32 #include "id_context.h"
  33 #include "id_objects.h"
  34
  35
  36 static void
  37 identity_destroy(struct pipe_context *_pipe)
  38 {
  39    struct identity_context *id_pipe = identity_context(_pipe);
  40    struct pipe_context *pipe = id_pipe->pipe;
  41
  42    pipe->destroy(pipe);
  43
  44    free(id_pipe);
  45 }
  46
  47 static void
  48 identity_draw_arrays(struct pipe_context *_pipe,
  49                      unsigned prim,
  50                      unsigned start,
  51                      unsigned count)
  52 {
  53    struct identity_context *id_pipe = identity_context(_pipe);
  54    struct pipe_context *pipe = id_pipe->pipe;
  55
  56    pipe->draw_arrays(pipe,
  57                      prim,
  58                      start,
  59                      count);
  60 }
  61
  62 static void
  63 identity_draw_elements(struct pipe_context *_pipe,
  64                        struct pipe_buffer *_indexBuffer,
  65                        unsigned indexSize,
  66                        unsigned prim,
  67                        unsigned start,
  68                        unsigned count)
  69 {
  70    struct identity_context *id_pipe = identity_context(_pipe);
  71    struct identity_buffer *id_buffer = identity_buffer(_indexBuffer);
  72    struct pipe_context *pipe = id_pipe->pipe;
  73    struct pipe_buffer *indexBuffer = id_buffer->buffer;
  74
  75    pipe->draw_elements(pipe,
  76                        indexBuffer,
  77                        indexSize,
  78                        prim,
  79                        start,
  80                        count);
  81 }
  82
  83 static void
  84 identity_draw_range_elements(struct pipe_context *_pipe,
  85                              struct pipe_buffer *_indexBuffer,
  86                              unsigned indexSize,
  87                              unsigned minIndex,
  88                              unsigned maxIndex,
  89                              unsigned mode,
  90                              unsigned start,
  91                              unsigned count)
  92 {
  93    struct identity_context *id_pipe = identity_context(_pipe);
  94    struct identity_buffer *id_buffer = identity_buffer(_indexBuffer);
  95    struct pipe_context *pipe = id_pipe->pipe;
  96    struct pipe_buffer *indexBuffer = id_buffer->buffer;
  97
  98    pipe->draw_range_elements(pipe,
  99                              indexBuffer,
 100                              indexSize,
 101                              minIndex,
 102                              maxIndex,
 103                              mode,
 104                              start,
 105                              count);
 106 }
 107
 108 static struct pipe_query *
 109 identity_create_query(struct pipe_context *_pipe,
 110                       unsigned query_type)
 111 {
 112    struct identity_context *id_pipe = identity_context(_pipe);
 113    struct pipe_context *pipe = id_pipe->pipe;
 114
 115    return pipe->create_query(pipe,
 116                              query_type);
 117 }
 118
 119 static void
 120 identity_destroy_query(struct pipe_context *_pipe,
 121                        struct pipe_query *query)
 122 {
 123    struct identity_context *id_pipe = identity_context(_pipe);
 124    struct pipe_context *pipe = id_pipe->pipe;
 125
 126    pipe->destroy_query(pipe,
 127                        query);
 128 }
 129
 130 static void
 131 identity_begin_query(struct pipe_context *_pipe,
 132                      struct pipe_query *query)
 133 {
 134    struct identity_context *id_pipe = identity_context(_pipe);
 135    struct pipe_context *pipe = id_pipe->pipe;
 136
 137    pipe->begin_query(pipe,
 138                      query);
 139 }
 140
 141 static void
 142 identity_end_query(struct pipe_context *_pipe,
 143                    struct pipe_query *query)
 144 {
 145    struct identity_context *id_pipe = identity_context(_pipe);
 146    struct pipe_context *pipe = id_pipe->pipe;
 147
 148    pipe->end_query(pipe,
 149                    query);
 150 }
 151
 152 static boolean
 153 identity_get_query_result(struct pipe_context *_pipe,
 154                           struct pipe_query *query,
 155                           boolean wait,
 156                           uint64_t *result)
 157 {
 158    struct identity_context *id_pipe = identity_context(_pipe);
 159    struct pipe_context *pipe = id_pipe->pipe;
 160
 161    return pipe->get_query_result(pipe,
 162                                  query,
 163                                  wait,
 164                                  result);
 165 }
 166
 167 static void *
 168 identity_create_blend_state(struct pipe_context *_pipe,
 169                             const struct pipe_blend_state *blend)
 170 {
 171    struct identity_context *id_pipe = identity_context(_pipe);
 172    struct pipe_context *pipe = id_pipe->pipe;
 173
 174    return pipe->create_blend_state(pipe,
 175                                    blend);
 176 }
 177
 178 static void
 179 identity_bind_blend_state(struct pipe_context *_pipe,
 180                           void *blend)
 181 {
 182    struct identity_context *id_pipe = identity_context(_pipe);
 183    struct pipe_context *pipe = id_pipe->pipe;
 184
 185    pipe->bind_blend_state(pipe,
 186                               blend);
 187 }
 188
 189 static void
 190 identity_delete_blend_state(struct pipe_context *_pipe,
 191                             void *blend)
 192 {
 193    struct identity_context *id_pipe = identity_context(_pipe);
 194    struct pipe_context *pipe = id_pipe->pipe;
 195
 196    pipe->delete_blend_state(pipe,
 197                             blend);
 198 }
 199
 200 static void *
 201 identity_create_sampler_state(struct pipe_context *_pipe,
 202                               const struct pipe_sampler_state *sampler)
 203 {
 204    struct identity_context *id_pipe = identity_context(_pipe);
 205    struct pipe_context *pipe = id_pipe->pipe;
 206
 207    return pipe->create_sampler_state(pipe,
 208                                      sampler);
 209 }
 210
 211 static void
 212 identity_bind_fragment_sampler_states(struct pipe_context *_pipe,
 213                                       unsigned num_samplers,
 214                                       void **samplers)
 215 {
 216    struct identity_context *id_pipe = identity_context(_pipe);
 217    struct pipe_context *pipe = id_pipe->pipe;
 218
 219    pipe->bind_fragment_sampler_states(pipe,
 220                                       num_samplers,
 221                                       samplers);
 222 }
 223
 224 static void
 225 identity_bind_vertex_sampler_states(struct pipe_context *_pipe,
 226                                     unsigned num_samplers,
 227                                     void **samplers)
 228 {
 229    struct identity_context *id_pipe = identity_context(_pipe);
 230    struct pipe_context *pipe = id_pipe->pipe;
 231
 232    pipe->bind_vertex_sampler_states(pipe,
 233                                     num_samplers,
 234                                     samplers);
 235 }
 236
 237 static void
 238 identity_delete_sampler_state(struct pipe_context *_pipe,
 239                               void *sampler)
 240 {
 241    struct identity_context *id_pipe = identity_context(_pipe);
 242    struct pipe_context *pipe = id_pipe->pipe;
 243
 244    pipe->delete_sampler_state(pipe,
 245                               sampler);
 246 }
 247
 248 static void *
 249 identity_create_rasterizer_state(struct pipe_context *_pipe,
 250                                  const struct pipe_rasterizer_state *rasterizer)
 251 {
 252    struct identity_context *id_pipe = identity_context(_pipe);
 253    struct pipe_context *pipe = id_pipe->pipe;
 254
 255    return pipe->create_rasterizer_state(pipe,
 256                                         rasterizer);
 257 }
 258
 259 static void
 260 identity_bind_rasterizer_state(struct pipe_context *_pipe,
 261                                void *rasterizer)
 262 {
 263    struct identity_context *id_pipe = identity_context(_pipe);
 264    struct pipe_context *pipe = id_pipe->pipe;
 265
 266    pipe->bind_rasterizer_state(pipe,
 267                                rasterizer);
 268 }
 269
 270 static void
 271 identity_delete_rasterizer_state(struct pipe_context *_pipe,
 272                                  void *rasterizer)
 273 {
 274    struct identity_context *id_pipe = identity_context(_pipe);
 275    struct pipe_context *pipe = id_pipe->pipe;
 276
 277    pipe->delete_rasterizer_state(pipe,
 278                                  rasterizer);
 279 }
 280
 281 static void *
 282 identity_create_depth_stencil_alpha_state(struct pipe_context *_pipe,
 283                                           const struct pipe_depth_stencil_alpha_state *depth_stencil_alpha)
 284 {
 285    struct identity_context *id_pipe = identity_context(_pipe);
 286    struct pipe_context *pipe = id_pipe->pipe;
 287
 288    return pipe->create_depth_stencil_alpha_state(pipe,
 289                                                  depth_stencil_alpha);
 290 }
 291
 292 static void
 293 identity_bind_depth_stencil_alpha_state(struct pipe_context *_pipe,
 294                                         void *depth_stencil_alpha)
 295 {
 296    struct identity_context *id_pipe = identity_context(_pipe);
 297    struct pipe_context *pipe = id_pipe->pipe;
 298
 299    pipe->bind_depth_stencil_alpha_state(pipe,
 300                                         depth_stencil_alpha);
 301 }
 302
 303 static void
 304 identity_delete_depth_stencil_alpha_state(struct pipe_context *_pipe,
 305                                           void *depth_stencil_alpha)
 306 {
 307    struct identity_context *id_pipe = identity_context(_pipe);
 308    struct pipe_context *pipe = id_pipe->pipe;
 309
 310    pipe->delete_depth_stencil_alpha_state(pipe,
 311                                           depth_stencil_alpha);
 312 }
 313
 314 static void *
 315 identity_create_fs_state(struct pipe_context *_pipe,
 316                          const struct pipe_shader_state *fs)
 317 {
 318    struct identity_context *id_pipe = identity_context(_pipe);
 319    struct pipe_context *pipe = id_pipe->pipe;
 320
 321    return pipe->create_fs_state(pipe,
 322                                 fs);
 323 }
 324
 325 static void
 326 identity_bind_fs_state(struct pipe_context *_pipe,
 327                        void *fs)
 328 {
 329    struct identity_context *id_pipe = identity_context(_pipe);
 330    struct pipe_context *pipe = id_pipe->pipe;
 331
 332    pipe->bind_fs_state(pipe,
 333                        fs);
 334 }
 335
 336 static void
 337 identity_delete_fs_state(struct pipe_context *_pipe,
 338                          void *fs)
 339 {
 340    struct identity_context *id_pipe = identity_context(_pipe);
 341    struct pipe_context *pipe = id_pipe->pipe;
 342
 343    pipe->delete_fs_state(pipe,
 344                          fs);
 345 }
 346
 347 static void *
 348 identity_create_vs_state(struct pipe_context *_pipe,
 349                          const struct pipe_shader_state *vs)
 350 {
 351    struct identity_context *id_pipe = identity_context(_pipe);
 352    struct pipe_context *pipe = id_pipe->pipe;
 353
 354    return pipe->create_vs_state(pipe,
 355                                 vs);
 356 }
 357
 358 static void
 359 identity_bind_vs_state(struct pipe_context *_pipe,
 360                        void *vs)
 361 {
 362    struct identity_context *id_pipe = identity_context(_pipe);
 363    struct pipe_context *pipe = id_pipe->pipe;
 364
 365    pipe->bind_vs_state(pipe,
 366                        vs);
 367 }
 368
 369 static void
 370 identity_delete_vs_state(struct pipe_context *_pipe,
 371                          void *vs)
 372 {
 373    struct identity_context *id_pipe = identity_context(_pipe);
 374    struct pipe_context *pipe = id_pipe->pipe;
 375
 376    pipe->delete_vs_state(pipe,
 377                          vs);
 378 }
 379
 380
 381 static void *
 382 identity_create_vertex_elements_state(struct pipe_context *_pipe,
 383                                       unsigned num_elements,
 384                                       const struct pipe_vertex_element *vertex_elements)
 385 {
 386    struct identity_context *id_pipe = identity_context(_pipe);
 387    struct pipe_context *pipe = id_pipe->pipe;
 388
 389    return pipe->create_vertex_elements_state(pipe,
 390                                              num_elements,
 391                                              vertex_elements);
 392 }
 393
 394 static void
 395 identity_bind_vertex_elements_state(struct pipe_context *_pipe,
 396                                     void *velems)
 397 {
 398    struct identity_context *id_pipe = identity_context(_pipe);
 399    struct pipe_context *pipe = id_pipe->pipe;
 400
 401    pipe->bind_vertex_elements_state(pipe,
 402                                     velems);
 403 }
 404
 405 static void
 406 identity_delete_vertex_elements_state(struct pipe_context *_pipe,
 407                                       void *velems)
 408 {
 409    struct identity_context *id_pipe = identity_context(_pipe);
 410    struct pipe_context *pipe = id_pipe->pipe;
 411
 412    pipe->delete_vertex_elements_state(pipe,
 413                                       velems);
 414 }
 415
 416 static void
 417 identity_set_blend_color(struct pipe_context *_pipe,
 418                          const struct pipe_blend_color *blend_color)
 419 {
 420    struct identity_context *id_pipe = identity_context(_pipe);
 421    struct pipe_context *pipe = id_pipe->pipe;
 422
 423    pipe->set_blend_color(pipe,
 424                          blend_color);
 425 }
 426
 427 static void
 428 identity_set_stencil_ref(struct pipe_context *_pipe,
 429                          const struct pipe_stencil_ref *stencil_ref)
 430 {
 431    struct identity_context *id_pipe = identity_context(_pipe);
 432    struct pipe_context *pipe = id_pipe->pipe;
 433
 434    pipe->set_stencil_ref(pipe,
 435                          stencil_ref);
 436 }
 437
 438 static void
 439 identity_set_clip_state(struct pipe_context *_pipe,
 440                         const struct pipe_clip_state *clip)
 441 {
 442    struct identity_context *id_pipe = identity_context(_pipe);
 443    struct pipe_context *pipe = id_pipe->pipe;
 444
 445    pipe->set_clip_state(pipe,
 446                         clip);
 447 }
 448
 449 static void
 450 identity_set_constant_buffer(struct pipe_context *_pipe,
 451                              uint shader,
 452                              uint index,
 453                              struct pipe_buffer *_buffer)
 454 {
 455    struct identity_context *id_pipe = identity_context(_pipe);
 456    struct pipe_context *pipe = id_pipe->pipe;
 457    struct pipe_buffer *unwrapped_buffer;
 458    struct pipe_buffer *buffer = NULL;
 459
 460    /* XXX hmm? unwrap the input state */
 461    if (_buffer) {
 462       unwrapped_buffer = identity_buffer_unwrap(_buffer);
 463       buffer = unwrapped_buffer;
 464    }
 465
 466    pipe->set_constant_buffer(pipe,
 467                              shader,
 468                              index,
 469                              buffer);
 470 }
 471
 472 static void
 473 identity_set_framebuffer_state(struct pipe_context *_pipe,
 474                                const struct pipe_framebuffer_state *_state)
 475 {
 476    struct identity_context *id_pipe = identity_context(_pipe);
 477    struct pipe_context *pipe = id_pipe->pipe;
 478    struct pipe_framebuffer_state unwrapped_state;
 479    struct pipe_framebuffer_state *state = NULL;
 480    unsigned i;
 481
 482    /* unwrap the input state */
 483    if (_state) {
 484       memcpy(&unwrapped_state, _state, sizeof(unwrapped_state));
 485       for(i = 0; i < _state->nr_cbufs; i++)
 486          unwrapped_state.cbufs[i] = identity_surface_unwrap(_state->cbufs[i]);
 487       for (; i < PIPE_MAX_COLOR_BUFS; i++)
 488          unwrapped_state.cbufs[i] = NULL;
 489       unwrapped_state.zsbuf = identity_surface_unwrap(_state->zsbuf);
 490       state = &unwrapped_state;
 491    }
 492
 493    pipe->set_framebuffer_state(pipe,
 494                                state);
 495 }
 496
 497 static void
 498 identity_set_polygon_stipple(struct pipe_context *_pipe,
 499                              const struct pipe_poly_stipple *poly_stipple)
 500 {
 501    struct identity_context *id_pipe = identity_context(_pipe);
 502    struct pipe_context *pipe = id_pipe->pipe;
 503
 504    pipe->set_polygon_stipple(pipe,
 505                              poly_stipple);
 506 }
 507
 508 static void
 509 identity_set_scissor_state(struct pipe_context *_pipe,
 510                            const struct pipe_scissor_state *scissor)
 511 {
 512    struct identity_context *id_pipe = identity_context(_pipe);
 513    struct pipe_context *pipe = id_pipe->pipe;
 514
 515    pipe->set_scissor_state(pipe,
 516                            scissor);
 517 }
 518
 519 static void
 520 identity_set_viewport_state(struct pipe_context *_pipe,
 521                             const struct pipe_viewport_state *viewport)
 522 {
 523    struct identity_context *id_pipe = identity_context(_pipe);
 524    struct pipe_context *pipe = id_pipe->pipe;
 525
 526    pipe->set_viewport_state(pipe,
 527                             viewport);
 528 }
 529
 530 static void
 531 identity_set_fragment_sampler_textures(struct pipe_context *_pipe,
 532                                        unsigned num_textures,
 533                                        struct pipe_texture **_textures)
 534 {
 535    struct identity_context *id_pipe = identity_context(_pipe);
 536    struct pipe_context *pipe = id_pipe->pipe;
 537    struct pipe_texture *unwrapped_textures[PIPE_MAX_SAMPLERS];
 538    struct pipe_texture **textures = NULL;
 539    unsigned i;
 540
 541    if (_textures) {
 542       for (i = 0; i < num_textures; i++)
 543          unwrapped_textures[i] = identity_texture_unwrap(_textures[i]);
 544       for (; i < PIPE_MAX_SAMPLERS; i++)
 545          unwrapped_textures[i] = NULL;
 546
 547       textures = unwrapped_textures;
 548    }
 549
 550    pipe->set_fragment_sampler_textures(pipe,
 551                                        num_textures,
 552                                        textures);
 553 }
 554
 555 static void
 556 identity_set_vertex_sampler_textures(struct pipe_context *_pipe,
 557                                      unsigned num_textures,
 558                                      struct pipe_texture **_textures)
 559 {
 560    struct identity_context *id_pipe = identity_context(_pipe);
 561    struct pipe_context *pipe = id_pipe->pipe;
 562    struct pipe_texture *unwrapped_textures[PIPE_MAX_VERTEX_SAMPLERS];
 563    struct pipe_texture **textures = NULL;
 564    unsigned i;
 565
 566    if (_textures) {
 567       for (i = 0; i < num_textures; i++)
 568          unwrapped_textures[i] = identity_texture_unwrap(_textures[i]);
 569       for (; i < PIPE_MAX_VERTEX_SAMPLERS; i++)
 570          unwrapped_textures[i] = NULL;
 571
 572       textures = unwrapped_textures;
 573    }
 574
 575    pipe->set_vertex_sampler_textures(pipe,
 576                                      num_textures,
 577                                      textures);
 578 }
 579
 580 static void
 581 identity_set_vertex_buffers(struct pipe_context *_pipe,
 582                             unsigned num_buffers,
 583                             const struct pipe_vertex_buffer *_buffers)
 584 {
 585    struct identity_context *id_pipe = identity_context(_pipe);
 586    struct pipe_context *pipe = id_pipe->pipe;
 587    struct pipe_vertex_buffer unwrapped_buffers[PIPE_MAX_SHADER_INPUTS];
 588    struct pipe_vertex_buffer *buffers = NULL;
 589    unsigned i;
 590
 591    if (num_buffers) {
 592       memcpy(unwrapped_buffers, _buffers, num_buffers * sizeof(*_buffers));
 593       for (i = 0; i < num_buffers; i++)
 594          unwrapped_buffers[i].buffer = identity_buffer_unwrap(_buffers[i].buffer);
 595       buffers = unwrapped_buffers;
 596    }
 597
 598    pipe->set_vertex_buffers(pipe,
 599                             num_buffers,
 600                             buffers);
 601 }
 602 static void
 603 identity_surface_copy(struct pipe_context *_pipe,
 604                       struct pipe_surface *_dst,
 605                       unsigned dstx,
 606                       unsigned dsty,
 607                       struct pipe_surface *_src,
 608                       unsigned srcx,
 609                       unsigned srcy,
 610                       unsigned width,
 611                       unsigned height)
 612 {
 613    struct identity_context *id_pipe = identity_context(_pipe);
 614    struct identity_surface *id_surface_dst = identity_surface(_dst);
 615    struct identity_surface *id_surface_src = identity_surface(_src);
 616    struct pipe_context *pipe = id_pipe->pipe;
 617    struct pipe_surface *dst = id_surface_dst->surface;
 618    struct pipe_surface *src = id_surface_src->surface;
 619
 620    pipe->surface_copy(pipe,
 621                       dst,
 622                       dstx,
 623                       dsty,
 624                       src,
 625                       srcx,
 626                       srcy,
 627                       width,
 628                       height);
 629 }
 630
 631 static void
 632 identity_surface_fill(struct pipe_context *_pipe,
 633                       struct pipe_surface *_dst,
 634                       unsigned dstx,
 635                       unsigned dsty,
 636                       unsigned width,
 637                       unsigned height,
 638                       unsigned value)
 639 {
 640    struct identity_context *id_pipe = identity_context(_pipe);
 641    struct identity_surface *id_surface_dst = identity_surface(_dst);
 642    struct pipe_context *pipe = id_pipe->pipe;
 643    struct pipe_surface *dst = id_surface_dst->surface;
 644
 645    pipe->surface_fill(pipe,
 646                       dst,
 647                       dstx,
 648                       dsty,
 649                       width,
 650                       height,
 651                       value);
 652 }
 653
 654 static void
 655 identity_clear(struct pipe_context *_pipe,
 656                unsigned buffers,
 657                const float *rgba,
 658                double depth,
 659                unsigned stencil)
 660 {
 661    struct identity_context *id_pipe = identity_context(_pipe);
 662    struct pipe_context *pipe = id_pipe->pipe;
 663
 664    pipe->clear(pipe,
 665                buffers,
 666                rgba,
 667                depth,
 668                stencil);
 669 }
 670
 671 static void
 672 identity_flush(struct pipe_context *_pipe,
 673                unsigned flags,
 674                struct pipe_fence_handle **fence)
 675 {
 676    struct identity_context *id_pipe = identity_context(_pipe);
 677    struct pipe_context *pipe = id_pipe->pipe;
 678
 679    pipe->flush(pipe,
 680                flags,
 681                fence);
 682 }
 683
 684 static unsigned int
 685 identity_is_texture_referenced(struct pipe_context *_pipe,
 686                                struct pipe_texture *_texture,
 687                                unsigned face,
 688                                unsigned level)
 689 {
 690    struct identity_context *id_pipe = identity_context(_pipe);
 691    struct identity_texture *id_texture = identity_texture(_texture);
 692    struct pipe_context *pipe = id_pipe->pipe;
 693    struct pipe_texture *texture = id_texture->texture;
 694
 695    return pipe->is_texture_referenced(pipe,
 696                                       texture,
 697                                       face,
 698                                       level);
 699 }
 700
 701 static unsigned int
 702 identity_is_buffer_referenced(struct pipe_context *_pipe,
 703                               struct pipe_buffer *_buffer)
 704 {
 705    struct identity_context *id_pipe = identity_context(_pipe);
 706    struct identity_buffer *id_buffer = identity_buffer(_buffer);
 707    struct pipe_context *pipe = id_pipe->pipe;
 708    struct pipe_buffer *buffer = id_buffer->buffer;
 709
 710    return pipe->is_buffer_referenced(pipe,
 711                                      buffer);
 712 }
 713
 714 struct pipe_context *
 715 identity_context_create(struct pipe_screen *_screen, struct pipe_context *pipe)
 716 {
 717    struct identity_context *id_pipe;
 718    (void)identity_screen(_screen);
 719
 720    id_pipe = CALLOC_STRUCT(identity_context);
 721    if (!id_pipe) {
 722       return NULL;
 723    }
 724
 725    id_pipe->base.winsys = NULL;
 726    id_pipe->base.screen = _screen;
 727    id_pipe->base.priv = pipe->priv; /* expose wrapped data */
 728    id_pipe->base.draw = NULL;
 729
 730    id_pipe->base.destroy = identity_destroy;
 731    id_pipe->base.draw_arrays = identity_draw_arrays;
 732    id_pipe->base.draw_elements = identity_draw_elements;
 733    id_pipe->base.draw_range_elements = identity_draw_range_elements;
 734    id_pipe->base.create_query = identity_create_query;
 735    id_pipe->base.destroy_query = identity_destroy_query;
 736    id_pipe->base.begin_query = identity_begin_query;
 737    id_pipe->base.end_query = identity_end_query;
 738    id_pipe->base.get_query_result = identity_get_query_result;
 739    id_pipe->base.create_blend_state = identity_create_blend_state;
 740    id_pipe->base.bind_blend_state = identity_bind_blend_state;
 741    id_pipe->base.delete_blend_state = identity_delete_blend_state;
 742    id_pipe->base.create_sampler_state = identity_create_sampler_state;
 743    id_pipe->base.bind_fragment_sampler_states = identity_bind_fragment_sampler_states;
 744    id_pipe->base.bind_vertex_sampler_states = identity_bind_vertex_sampler_states;
 745    id_pipe->base.delete_sampler_state = identity_delete_sampler_state;
 746    id_pipe->base.create_rasterizer_state = identity_create_rasterizer_state;
 747    id_pipe->base.bind_rasterizer_state = identity_bind_rasterizer_state;
 748    id_pipe->base.delete_rasterizer_state = identity_delete_rasterizer_state;
 749    id_pipe->base.create_depth_stencil_alpha_state = identity_create_depth_stencil_alpha_state;
 750    id_pipe->base.bind_depth_stencil_alpha_state = identity_bind_depth_stencil_alpha_state;
 751    id_pipe->base.delete_depth_stencil_alpha_state = identity_delete_depth_stencil_alpha_state;
 752    id_pipe->base.create_fs_state = identity_create_fs_state;
 753    id_pipe->base.bind_fs_state = identity_bind_fs_state;
 754    id_pipe->base.delete_fs_state = identity_delete_fs_state;
 755    id_pipe->base.create_vs_state = identity_create_vs_state;
 756    id_pipe->base.bind_vs_state = identity_bind_vs_state;
 757    id_pipe->base.delete_vs_state = identity_delete_vs_state;
 758    id_pipe->base.create_vertex_elements_state = identity_create_vertex_elements_state;
 759    id_pipe->base.bind_vertex_elements_state = identity_bind_vertex_elements_state;
 760    id_pipe->base.delete_vertex_elements_state = identity_delete_vertex_elements_state;
 761    id_pipe->base.set_blend_color = identity_set_blend_color;
 762    id_pipe->base.set_stencil_ref = identity_set_stencil_ref;
 763    id_pipe->base.set_clip_state = identity_set_clip_state;
 764    id_pipe->base.set_constant_buffer = identity_set_constant_buffer;
 765    id_pipe->base.set_framebuffer_state = identity_set_framebuffer_state;
 766    id_pipe->base.set_polygon_stipple = identity_set_polygon_stipple;
 767    id_pipe->base.set_scissor_state = identity_set_scissor_state;
 768    id_pipe->base.set_viewport_state = identity_set_viewport_state;
 769    id_pipe->base.set_fragment_sampler_textures = identity_set_fragment_sampler_textures;
 770    id_pipe->base.set_vertex_sampler_textures = identity_set_vertex_sampler_textures;
 771    id_pipe->base.set_vertex_buffers = identity_set_vertex_buffers;
 772    id_pipe->base.surface_copy = identity_surface_copy;
 773    id_pipe->base.surface_fill = identity_surface_fill;
 774    id_pipe->base.clear = identity_clear;
 775    id_pipe->base.flush = identity_flush;
 776    id_pipe->base.is_texture_referenced = identity_is_texture_referenced;
 777    id_pipe->base.is_buffer_referenced = identity_is_buffer_referenced;
 778
 779    id_pipe->pipe = pipe;
 780
 781    return &id_pipe->base;
 782 }