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 static void
 381 identity_set_blend_color(struct pipe_context *_pipe,
 382                          const struct pipe_blend_color *blend_color)
 383 {
 384    struct identity_context *id_pipe = identity_context(_pipe);
 385    struct pipe_context *pipe = id_pipe->pipe;
 386
 387    pipe->set_blend_color(pipe,
 388                          blend_color);
 389 }
 390
 391 static void
 392 identity_set_stencil_ref(struct pipe_context *_pipe,
 393                          const struct pipe_stencil_ref *stencil_ref)
 394 {
 395    struct identity_context *id_pipe = identity_context(_pipe);
 396    struct pipe_context *pipe = id_pipe->pipe;
 397
 398    pipe->set_stencil_ref(pipe,
 399                          stencil_ref);
 400 }
 401
 402 static void
 403 identity_set_clip_state(struct pipe_context *_pipe,
 404                         const struct pipe_clip_state *clip)
 405 {
 406    struct identity_context *id_pipe = identity_context(_pipe);
 407    struct pipe_context *pipe = id_pipe->pipe;
 408
 409    pipe->set_clip_state(pipe,
 410                         clip);
 411 }
 412
 413 static void
 414 identity_set_constant_buffer(struct pipe_context *_pipe,
 415                              uint shader,
 416                              uint index,
 417                              struct pipe_buffer *_buffer)
 418 {
 419    struct identity_context *id_pipe = identity_context(_pipe);
 420    struct pipe_context *pipe = id_pipe->pipe;
 421    struct pipe_buffer *unwrapped_buffer;
 422    struct pipe_buffer *buffer = NULL;
 423
 424    /* XXX hmm? unwrap the input state */
 425    if (_buffer) {
 426       unwrapped_buffer = identity_buffer_unwrap(_buffer);
 427       buffer = unwrapped_buffer;
 428    }
 429
 430    pipe->set_constant_buffer(pipe,
 431                              shader,
 432                              index,
 433                              buffer);
 434 }
 435
 436 static void
 437 identity_set_framebuffer_state(struct pipe_context *_pipe,
 438                                const struct pipe_framebuffer_state *_state)
 439 {
 440    struct identity_context *id_pipe = identity_context(_pipe);
 441    struct pipe_context *pipe = id_pipe->pipe;
 442    struct pipe_framebuffer_state unwrapped_state;
 443    struct pipe_framebuffer_state *state = NULL;
 444    unsigned i;
 445
 446    /* unwrap the input state */
 447    if (_state) {
 448       memcpy(&unwrapped_state, _state, sizeof(unwrapped_state));
 449       for(i = 0; i < _state->nr_cbufs; i++)
 450          unwrapped_state.cbufs[i] = identity_surface_unwrap(_state->cbufs[i]);
 451       for (; i < PIPE_MAX_COLOR_BUFS; i++)
 452          unwrapped_state.cbufs[i] = NULL;
 453       unwrapped_state.zsbuf = identity_surface_unwrap(_state->zsbuf);
 454       state = &unwrapped_state;
 455    }
 456
 457    pipe->set_framebuffer_state(pipe,
 458                                state);
 459 }
 460
 461 static void
 462 identity_set_polygon_stipple(struct pipe_context *_pipe,
 463                              const struct pipe_poly_stipple *poly_stipple)
 464 {
 465    struct identity_context *id_pipe = identity_context(_pipe);
 466    struct pipe_context *pipe = id_pipe->pipe;
 467
 468    pipe->set_polygon_stipple(pipe,
 469                              poly_stipple);
 470 }
 471
 472 static void
 473 identity_set_scissor_state(struct pipe_context *_pipe,
 474                            const struct pipe_scissor_state *scissor)
 475 {
 476    struct identity_context *id_pipe = identity_context(_pipe);
 477    struct pipe_context *pipe = id_pipe->pipe;
 478
 479    pipe->set_scissor_state(pipe,
 480                            scissor);
 481 }
 482
 483 static void
 484 identity_set_viewport_state(struct pipe_context *_pipe,
 485                             const struct pipe_viewport_state *viewport)
 486 {
 487    struct identity_context *id_pipe = identity_context(_pipe);
 488    struct pipe_context *pipe = id_pipe->pipe;
 489
 490    pipe->set_viewport_state(pipe,
 491                             viewport);
 492 }
 493
 494 static void
 495 identity_set_fragment_sampler_textures(struct pipe_context *_pipe,
 496                                        unsigned num_textures,
 497                                        struct pipe_texture **_textures)
 498 {
 499    struct identity_context *id_pipe = identity_context(_pipe);
 500    struct pipe_context *pipe = id_pipe->pipe;
 501    struct pipe_texture *unwrapped_textures[PIPE_MAX_SAMPLERS];
 502    struct pipe_texture **textures = NULL;
 503    unsigned i;
 504
 505    if (_textures) {
 506       for (i = 0; i < num_textures; i++)
 507          unwrapped_textures[i] = identity_texture_unwrap(_textures[i]);
 508       for (; i < PIPE_MAX_SAMPLERS; i++)
 509          unwrapped_textures[i] = NULL;
 510
 511       textures = unwrapped_textures;
 512    }
 513
 514    pipe->set_fragment_sampler_textures(pipe,
 515                                        num_textures,
 516                                        textures);
 517 }
 518
 519 static void
 520 identity_set_vertex_sampler_textures(struct pipe_context *_pipe,
 521                                      unsigned num_textures,
 522                                      struct pipe_texture **_textures)
 523 {
 524    struct identity_context *id_pipe = identity_context(_pipe);
 525    struct pipe_context *pipe = id_pipe->pipe;
 526    struct pipe_texture *unwrapped_textures[PIPE_MAX_VERTEX_SAMPLERS];
 527    struct pipe_texture **textures = NULL;
 528    unsigned i;
 529
 530    if (_textures) {
 531       for (i = 0; i < num_textures; i++)
 532          unwrapped_textures[i] = identity_texture_unwrap(_textures[i]);
 533       for (; i < PIPE_MAX_VERTEX_SAMPLERS; i++)
 534          unwrapped_textures[i] = NULL;
 535
 536       textures = unwrapped_textures;
 537    }
 538
 539    pipe->set_vertex_sampler_textures(pipe,
 540                                      num_textures,
 541                                      textures);
 542 }
 543
 544 static void
 545 identity_set_vertex_buffers(struct pipe_context *_pipe,
 546                             unsigned num_buffers,
 547                             const struct pipe_vertex_buffer *_buffers)
 548 {
 549    struct identity_context *id_pipe = identity_context(_pipe);
 550    struct pipe_context *pipe = id_pipe->pipe;
 551    struct pipe_vertex_buffer unwrapped_buffers[PIPE_MAX_SHADER_INPUTS];
 552    struct pipe_vertex_buffer *buffers = NULL;
 553    unsigned i;
 554
 555    if (num_buffers) {
 556       memcpy(unwrapped_buffers, _buffers, num_buffers * sizeof(*_buffers));
 557       for (i = 0; i < num_buffers; i++)
 558          unwrapped_buffers[i].buffer = identity_buffer_unwrap(_buffers[i].buffer);
 559       buffers = unwrapped_buffers;
 560    }
 561
 562    pipe->set_vertex_buffers(pipe,
 563                             num_buffers,
 564                             buffers);
 565 }
 566
 567 static void
 568 identity_set_vertex_elements(struct pipe_context *_pipe,
 569                              unsigned num_elements,
 570                              const struct pipe_vertex_element *vertex_elements)
 571 {
 572    struct identity_context *id_pipe = identity_context(_pipe);
 573    struct pipe_context *pipe = id_pipe->pipe;
 574
 575    pipe->set_vertex_elements(pipe,
 576                              num_elements,
 577                              vertex_elements);
 578 }
 579
 580 static void
 581 identity_surface_copy(struct pipe_context *_pipe,
 582                       struct pipe_surface *_dst,
 583                       unsigned dstx,
 584                       unsigned dsty,
 585                       struct pipe_surface *_src,
 586                       unsigned srcx,
 587                       unsigned srcy,
 588                       unsigned width,
 589                       unsigned height)
 590 {
 591    struct identity_context *id_pipe = identity_context(_pipe);
 592    struct identity_surface *id_surface_dst = identity_surface(_dst);
 593    struct identity_surface *id_surface_src = identity_surface(_src);
 594    struct pipe_context *pipe = id_pipe->pipe;
 595    struct pipe_surface *dst = id_surface_dst->surface;
 596    struct pipe_surface *src = id_surface_src->surface;
 597
 598    pipe->surface_copy(pipe,
 599                       dst,
 600                       dstx,
 601                       dsty,
 602                       src,
 603                       srcx,
 604                       srcy,
 605                       width,
 606                       height);
 607 }
 608
 609 static void
 610 identity_surface_fill(struct pipe_context *_pipe,
 611                       struct pipe_surface *_dst,
 612                       unsigned dstx,
 613                       unsigned dsty,
 614                       unsigned width,
 615                       unsigned height,
 616                       unsigned value)
 617 {
 618    struct identity_context *id_pipe = identity_context(_pipe);
 619    struct identity_surface *id_surface_dst = identity_surface(_dst);
 620    struct pipe_context *pipe = id_pipe->pipe;
 621    struct pipe_surface *dst = id_surface_dst->surface;
 622
 623    pipe->surface_fill(pipe,
 624                       dst,
 625                       dstx,
 626                       dsty,
 627                       width,
 628                       height,
 629                       value);
 630 }
 631
 632 static void
 633 identity_clear(struct pipe_context *_pipe,
 634                unsigned buffers,
 635                const float *rgba,
 636                double depth,
 637                unsigned stencil)
 638 {
 639    struct identity_context *id_pipe = identity_context(_pipe);
 640    struct pipe_context *pipe = id_pipe->pipe;
 641
 642    pipe->clear(pipe,
 643                buffers,
 644                rgba,
 645                depth,
 646                stencil);
 647 }
 648
 649 static void
 650 identity_flush(struct pipe_context *_pipe,
 651                unsigned flags,
 652                struct pipe_fence_handle **fence)
 653 {
 654    struct identity_context *id_pipe = identity_context(_pipe);
 655    struct pipe_context *pipe = id_pipe->pipe;
 656
 657    pipe->flush(pipe,
 658                flags,
 659                fence);
 660 }
 661
 662 static unsigned int
 663 identity_is_texture_referenced(struct pipe_context *_pipe,
 664                                struct pipe_texture *_texture,
 665                                unsigned face,
 666                                unsigned level)
 667 {
 668    struct identity_context *id_pipe = identity_context(_pipe);
 669    struct identity_texture *id_texture = identity_texture(_texture);
 670    struct pipe_context *pipe = id_pipe->pipe;
 671    struct pipe_texture *texture = id_texture->texture;
 672
 673    return pipe->is_texture_referenced(pipe,
 674                                       texture,
 675                                       face,
 676                                       level);
 677 }
 678
 679 static unsigned int
 680 identity_is_buffer_referenced(struct pipe_context *_pipe,
 681                               struct pipe_buffer *_buffer)
 682 {
 683    struct identity_context *id_pipe = identity_context(_pipe);
 684    struct identity_buffer *id_buffer = identity_buffer(_buffer);
 685    struct pipe_context *pipe = id_pipe->pipe;
 686    struct pipe_buffer *buffer = id_buffer->buffer;
 687
 688    return pipe->is_buffer_referenced(pipe,
 689                                      buffer);
 690 }
 691
 692 struct pipe_context *
 693 identity_context_create(struct pipe_screen *_screen, struct pipe_context *pipe)
 694 {
 695    struct identity_context *id_pipe;
 696    (void)identity_screen(_screen);
 697
 698    id_pipe = CALLOC_STRUCT(identity_context);
 699    if (!id_pipe) {
 700       return NULL;
 701    }
 702
 703    id_pipe->base.winsys = NULL;
 704    id_pipe->base.screen = _screen;
 705    id_pipe->base.priv = pipe->priv; /* expose wrapped data */
 706    id_pipe->base.draw = NULL;
 707
 708    id_pipe->base.destroy = identity_destroy;
 709    id_pipe->base.draw_arrays = identity_draw_arrays;
 710    id_pipe->base.draw_elements = identity_draw_elements;
 711    id_pipe->base.draw_range_elements = identity_draw_range_elements;
 712    id_pipe->base.create_query = identity_create_query;
 713    id_pipe->base.destroy_query = identity_destroy_query;
 714    id_pipe->base.begin_query = identity_begin_query;
 715    id_pipe->base.end_query = identity_end_query;
 716    id_pipe->base.get_query_result = identity_get_query_result;
 717    id_pipe->base.create_blend_state = identity_create_blend_state;
 718    id_pipe->base.bind_blend_state = identity_bind_blend_state;
 719    id_pipe->base.delete_blend_state = identity_delete_blend_state;
 720    id_pipe->base.create_sampler_state = identity_create_sampler_state;
 721    id_pipe->base.bind_fragment_sampler_states = identity_bind_fragment_sampler_states;
 722    id_pipe->base.bind_vertex_sampler_states = identity_bind_vertex_sampler_states;
 723    id_pipe->base.delete_sampler_state = identity_delete_sampler_state;
 724    id_pipe->base.create_rasterizer_state = identity_create_rasterizer_state;
 725    id_pipe->base.bind_rasterizer_state = identity_bind_rasterizer_state;
 726    id_pipe->base.delete_rasterizer_state = identity_delete_rasterizer_state;
 727    id_pipe->base.create_depth_stencil_alpha_state = identity_create_depth_stencil_alpha_state;
 728    id_pipe->base.bind_depth_stencil_alpha_state = identity_bind_depth_stencil_alpha_state;
 729    id_pipe->base.delete_depth_stencil_alpha_state = identity_delete_depth_stencil_alpha_state;
 730    id_pipe->base.create_fs_state = identity_create_fs_state;
 731    id_pipe->base.bind_fs_state = identity_bind_fs_state;
 732    id_pipe->base.delete_fs_state = identity_delete_fs_state;
 733    id_pipe->base.create_vs_state = identity_create_vs_state;
 734    id_pipe->base.bind_vs_state = identity_bind_vs_state;
 735    id_pipe->base.delete_vs_state = identity_delete_vs_state;
 736    id_pipe->base.set_blend_color = identity_set_blend_color;
 737    id_pipe->base.set_stencil_ref = identity_set_stencil_ref;
 738    id_pipe->base.set_clip_state = identity_set_clip_state;
 739    id_pipe->base.set_constant_buffer = identity_set_constant_buffer;
 740    id_pipe->base.set_framebuffer_state = identity_set_framebuffer_state;
 741    id_pipe->base.set_polygon_stipple = identity_set_polygon_stipple;
 742    id_pipe->base.set_scissor_state = identity_set_scissor_state;
 743    id_pipe->base.set_viewport_state = identity_set_viewport_state;
 744    id_pipe->base.set_fragment_sampler_textures = identity_set_fragment_sampler_textures;
 745    id_pipe->base.set_vertex_sampler_textures = identity_set_vertex_sampler_textures;
 746    id_pipe->base.set_vertex_buffers = identity_set_vertex_buffers;
 747    id_pipe->base.set_vertex_elements = identity_set_vertex_elements;
 748    id_pipe->base.surface_copy = identity_surface_copy;
 749    id_pipe->base.surface_fill = identity_surface_fill;
 750    id_pipe->base.clear = identity_clear;
 751    id_pipe->base.flush = identity_flush;
 752    id_pipe->base.is_texture_referenced = identity_is_texture_referenced;
 753    id_pipe->base.is_buffer_referenced = identity_is_buffer_referenced;
 754
 755    id_pipe->pipe = pipe;
 756
 757    return &id_pipe->base;
 758 }