src/gallium/drivers/llvmpipe/lp_setup.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   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 TUNGSTEN GRAPHICS 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  * Tiling engine.
  30  *
  31  * Builds per-tile display lists and executes them on calls to
  32  * lp_setup_flush().
  33  */
  34
  35 #include "pipe/p_defines.h"
  36 #include "util/u_inlines.h"
  37 #include "util/u_memory.h"
  38 #include "util/u_pack_color.h"
  39 #include "util/u_surface.h"
  40 #include "lp_scene.h"
  41 #include "lp_scene_queue.h"
  42 #include "lp_buffer.h"
  43 #include "lp_texture.h"
  44 #include "lp_debug.h"
  45 #include "lp_fence.h"
  46 #include "lp_rast.h"
  47 #include "lp_setup_context.h"
  48 #include "lp_screen.h"
  49 #include "state_tracker/sw_winsys.h"
  50
  51 #include "draw/draw_context.h"
  52 #include "draw/draw_vbuf.h"
  53
  54
  55 static void set_scene_state( struct lp_setup_context *, unsigned );
  56
  57
  58 struct lp_scene *
  59 lp_setup_get_current_scene(struct lp_setup_context *setup)
  60 {
  61    if (!setup->scene) {
  62
  63       /* wait for a free/empty scene
  64        */
  65       setup->scene = lp_scene_dequeue(setup->empty_scenes, TRUE);
  66
  67       assert(lp_scene_is_empty(setup->scene));
  68
  69       lp_scene_begin_binning(setup->scene,
  70                              &setup->fb );
  71    }
  72    return setup->scene;
  73 }
  74
  75
  76 static void
  77 first_triangle( struct lp_setup_context *setup,
  78                 const float (*v0)[4],
  79                 const float (*v1)[4],
  80                 const float (*v2)[4])
  81 {
  82    set_scene_state( setup, SETUP_ACTIVE );
  83    lp_setup_choose_triangle( setup );
  84    setup->triangle( setup, v0, v1, v2 );
  85 }
  86
  87 static void
  88 first_line( struct lp_setup_context *setup,
  89             const float (*v0)[4],
  90             const float (*v1)[4])
  91 {
  92    set_scene_state( setup, SETUP_ACTIVE );
  93    lp_setup_choose_line( setup );
  94    setup->line( setup, v0, v1 );
  95 }
  96
  97 static void
  98 first_point( struct lp_setup_context *setup,
  99              const float (*v0)[4])
 100 {
 101    set_scene_state( setup, SETUP_ACTIVE );
 102    lp_setup_choose_point( setup );
 103    setup->point( setup, v0 );
 104 }
 105
 106 static void reset_context( struct lp_setup_context *setup )
 107 {
 108    LP_DBG(DEBUG_SETUP, "%s\n", __FUNCTION__);
 109
 110    /* Reset derived state */
 111    setup->constants.stored_size = 0;
 112    setup->constants.stored_data = NULL;
 113    setup->fs.stored = NULL;
 114    setup->dirty = ~0;
 115
 116    /* no current bin */
 117    setup->scene = NULL;
 118
 119    /* Reset some state:
 120     */
 121    setup->clear.flags = 0;
 122
 123    /* Have an explicit "start-binning" call and get rid of this
 124     * pointer twiddling?
 125     */
 126    setup->line = first_line;
 127    setup->point = first_point;
 128    setup->triangle = first_triangle;
 129 }
 130
 131
 132 /** Rasterize all scene's bins */
 133 static void
 134 lp_setup_rasterize_scene( struct lp_setup_context *setup,
 135                           boolean write_depth )
 136 {
 137    struct lp_scene *scene = lp_setup_get_current_scene(setup);
 138
 139    lp_scene_rasterize(scene,
 140                       setup->rast,
 141                       write_depth);
 142
 143    reset_context( setup );
 144
 145    LP_DBG(DEBUG_SETUP, "%s done \n", __FUNCTION__);
 146 }
 147
 148
 149
 150 static void
 151 begin_binning( struct lp_setup_context *setup )
 152 {
 153    struct lp_scene *scene = lp_setup_get_current_scene(setup);
 154
 155    LP_DBG(DEBUG_SETUP, "%s color: %s depth: %s\n", __FUNCTION__,
 156           (setup->clear.flags & PIPE_CLEAR_COLOR) ? "clear": "load",
 157           (setup->clear.flags & PIPE_CLEAR_DEPTHSTENCIL) ? "clear": "load");
 158
 159    if (setup->fb.nr_cbufs) {
 160       if (setup->clear.flags & PIPE_CLEAR_COLOR)
 161          lp_scene_bin_everywhere( scene,
 162                                   lp_rast_clear_color,
 163                                   setup->clear.color );
 164       else
 165          lp_scene_bin_everywhere( scene,
 166                                   lp_rast_load_color,
 167                                   lp_rast_arg_null() );
 168    }
 169
 170    if (setup->fb.zsbuf) {
 171       if (setup->clear.flags & PIPE_CLEAR_DEPTHSTENCIL)
 172          lp_scene_bin_everywhere( scene,
 173                                   lp_rast_clear_zstencil,
 174                                   setup->clear.zstencil );
 175    }
 176
 177    LP_DBG(DEBUG_SETUP, "%s done\n", __FUNCTION__);
 178 }
 179
 180
 181 /* This basically bins and then flushes any outstanding full-screen
 182  * clears.
 183  *
 184  * TODO: fast path for fullscreen clears and no triangles.
 185  */
 186 static void
 187 execute_clears( struct lp_setup_context *setup )
 188 {
 189    LP_DBG(DEBUG_SETUP, "%s\n", __FUNCTION__);
 190
 191    begin_binning( setup );
 192    lp_setup_rasterize_scene( setup, TRUE );
 193 }
 194
 195
 196 static void
 197 set_scene_state( struct lp_setup_context *setup,
 198            unsigned new_state )
 199 {
 200    unsigned old_state = setup->state;
 201
 202    if (old_state == new_state)
 203       return;
 204
 205    LP_DBG(DEBUG_SETUP, "%s old %d new %d\n", __FUNCTION__, old_state, new_state);
 206
 207    switch (new_state) {
 208    case SETUP_ACTIVE:
 209       begin_binning( setup );
 210       break;
 211
 212    case SETUP_CLEARED:
 213       if (old_state == SETUP_ACTIVE) {
 214          assert(0);
 215          return;
 216       }
 217       break;
 218
 219    case SETUP_FLUSHED:
 220       if (old_state == SETUP_CLEARED)
 221          execute_clears( setup );
 222       else
 223          lp_setup_rasterize_scene( setup, TRUE );
 224       break;
 225    }
 226
 227    setup->state = new_state;
 228 }
 229
 230
 231 void
 232 lp_setup_flush( struct lp_setup_context *setup,
 233                 unsigned flags )
 234 {
 235    LP_DBG(DEBUG_SETUP, "%s\n", __FUNCTION__);
 236
 237    set_scene_state( setup, SETUP_FLUSHED );
 238 }
 239
 240
 241 void
 242 lp_setup_bind_framebuffer( struct lp_setup_context *setup,
 243                            const struct pipe_framebuffer_state *fb )
 244 {
 245    LP_DBG(DEBUG_SETUP, "%s\n", __FUNCTION__);
 246
 247    /* Flush any old scene.
 248     */
 249    set_scene_state( setup, SETUP_FLUSHED );
 250
 251    /* Set new state.  This will be picked up later when we next need a
 252     * scene.
 253     */
 254    util_copy_framebuffer_state(&setup->fb, fb);
 255 }
 256
 257
 258 void
 259 lp_setup_clear( struct lp_setup_context *setup,
 260                 const float *color,
 261                 double depth,
 262                 unsigned stencil,
 263                 unsigned flags )
 264 {
 265    struct lp_scene *scene = lp_setup_get_current_scene(setup);
 266    unsigned i;
 267
 268    LP_DBG(DEBUG_SETUP, "%s state %d\n", __FUNCTION__, setup->state);
 269
 270
 271    if (flags & PIPE_CLEAR_COLOR) {
 272       for (i = 0; i < 4; ++i)
 273          setup->clear.color.clear_color[i] = float_to_ubyte(color[i]);
 274    }
 275
 276    if (flags & PIPE_CLEAR_DEPTHSTENCIL) {
 277       setup->clear.zstencil.clear_zstencil =
 278          util_pack_z_stencil(setup->fb.zsbuf->format,
 279                              depth,
 280                              stencil);
 281    }
 282
 283    if (setup->state == SETUP_ACTIVE) {
 284       /* Add the clear to existing scene.  In the unusual case where
 285        * both color and depth-stencil are being cleared when there's
 286        * already been some rendering, we could discard the currently
 287        * binned scene and start again, but I don't see that as being
 288        * a common usage.
 289        */
 290       if (flags & PIPE_CLEAR_COLOR)
 291          lp_scene_bin_everywhere( scene,
 292                                   lp_rast_clear_color,
 293                                   setup->clear.color );
 294
 295       if (setup->clear.flags & PIPE_CLEAR_DEPTHSTENCIL)
 296          lp_scene_bin_everywhere( scene,
 297                                   lp_rast_clear_zstencil,
 298                                   setup->clear.zstencil );
 299    }
 300    else {
 301       /* Put ourselves into the 'pre-clear' state, specifically to try
 302        * and accumulate multiple clears to color and depth_stencil
 303        * buffers which the app or state-tracker might issue
 304        * separately.
 305        */
 306       set_scene_state( setup, SETUP_CLEARED );
 307
 308       setup->clear.flags |= flags;
 309    }
 310 }
 311
 312
 313 /**
 314  * Emit a fence.
 315  */
 316 struct pipe_fence_handle *
 317 lp_setup_fence( struct lp_setup_context *setup )
 318 {
 319    struct lp_scene *scene = lp_setup_get_current_scene(setup);
 320    const unsigned rank = lp_scene_get_num_bins( scene ); /* xxx */
 321    struct lp_fence *fence = lp_fence_create(rank);
 322
 323    LP_DBG(DEBUG_SETUP, "%s rank %u\n", __FUNCTION__, rank);
 324
 325    set_scene_state( setup, SETUP_ACTIVE );
 326
 327    /* insert the fence into all command bins */
 328    lp_scene_bin_everywhere( scene,
 329                             lp_rast_fence,
 330                             lp_rast_arg_fence(fence) );
 331
 332    return (struct pipe_fence_handle *) fence;
 333 }
 334
 335
 336 void
 337 lp_setup_set_triangle_state( struct lp_setup_context *setup,
 338                              unsigned cull_mode,
 339                              boolean ccw_is_frontface,
 340                              boolean scissor,
 341                              boolean gl_rasterization_rules)
 342 {
 343    LP_DBG(DEBUG_SETUP, "%s\n", __FUNCTION__);
 344
 345    setup->ccw_is_frontface = ccw_is_frontface;
 346    setup->cullmode = cull_mode;
 347    setup->triangle = first_triangle;
 348    setup->scissor_test = scissor;
 349    setup->pixel_offset = gl_rasterization_rules ? 0.5f : 0.0f;
 350 }
 351
 352
 353
 354 void
 355 lp_setup_set_fs_inputs( struct lp_setup_context *setup,
 356                         const struct lp_shader_input *input,
 357                         unsigned nr )
 358 {
 359    LP_DBG(DEBUG_SETUP, "%s %p %u\n", __FUNCTION__, (void *) input, nr);
 360
 361    memcpy( setup->fs.input, input, nr * sizeof input[0] );
 362    setup->fs.nr_inputs = nr;
 363 }
 364
 365 void
 366 lp_setup_set_fs_functions( struct lp_setup_context *setup,
 367                            lp_jit_frag_func jit_function0,
 368                            lp_jit_frag_func jit_function1,
 369                            boolean opaque )
 370 {
 371    LP_DBG(DEBUG_SETUP, "%s %p\n", __FUNCTION__, (void *) jit_function0);
 372    /* FIXME: reference count */
 373
 374    setup->fs.current.jit_function[0] = jit_function0;
 375    setup->fs.current.jit_function[1] = jit_function1;
 376    setup->fs.current.opaque = opaque;
 377    setup->dirty |= LP_SETUP_NEW_FS;
 378 }
 379
 380 void
 381 lp_setup_set_fs_constants(struct lp_setup_context *setup,
 382                           struct pipe_buffer *buffer)
 383 {
 384    LP_DBG(DEBUG_SETUP, "%s %p\n", __FUNCTION__, (void *) buffer);
 385
 386    pipe_buffer_reference(&setup->constants.current, buffer);
 387
 388    setup->dirty |= LP_SETUP_NEW_CONSTANTS;
 389 }
 390
 391
 392 void
 393 lp_setup_set_alpha_ref_value( struct lp_setup_context *setup,
 394                               float alpha_ref_value )
 395 {
 396    LP_DBG(DEBUG_SETUP, "%s %f\n", __FUNCTION__, alpha_ref_value);
 397
 398    if(setup->fs.current.jit_context.alpha_ref_value != alpha_ref_value) {
 399       setup->fs.current.jit_context.alpha_ref_value = alpha_ref_value;
 400       setup->dirty |= LP_SETUP_NEW_FS;
 401    }
 402 }
 403
 404 void
 405 lp_setup_set_blend_color( struct lp_setup_context *setup,
 406                           const struct pipe_blend_color *blend_color )
 407 {
 408    LP_DBG(DEBUG_SETUP, "%s\n", __FUNCTION__);
 409
 410    assert(blend_color);
 411
 412    if(memcmp(&setup->blend_color.current, blend_color, sizeof *blend_color) != 0) {
 413       memcpy(&setup->blend_color.current, blend_color, sizeof *blend_color);
 414       setup->dirty |= LP_SETUP_NEW_BLEND_COLOR;
 415    }
 416 }
 417
 418
 419 void
 420 lp_setup_set_scissor( struct lp_setup_context *setup,
 421                       const struct pipe_scissor_state *scissor )
 422 {
 423    LP_DBG(DEBUG_SETUP, "%s\n", __FUNCTION__);
 424
 425    assert(scissor);
 426
 427    if (memcmp(&setup->scissor.current, scissor, sizeof(*scissor)) != 0) {
 428       setup->scissor.current = *scissor; /* struct copy */
 429       setup->dirty |= LP_SETUP_NEW_SCISSOR;
 430    }
 431 }
 432
 433
 434 void
 435 lp_setup_set_flatshade_first( struct lp_setup_context *setup,
 436                               boolean flatshade_first )
 437 {
 438    setup->flatshade_first = flatshade_first;
 439 }
 440
 441
 442 void
 443 lp_setup_set_vertex_info( struct lp_setup_context *setup,
 444                           struct vertex_info *vertex_info )
 445 {
 446    /* XXX: just silently holding onto the pointer:
 447     */
 448    setup->vertex_info = vertex_info;
 449 }
 450
 451
 452 /**
 453  * Called during state validation when LP_NEW_TEXTURE is set.
 454  */
 455 void
 456 lp_setup_set_sampler_textures( struct lp_setup_context *setup,
 457                                unsigned num, struct pipe_texture **texture)
 458 {
 459    unsigned i;
 460
 461    LP_DBG(DEBUG_SETUP, "%s\n", __FUNCTION__);
 462
 463    assert(num <= PIPE_MAX_SAMPLERS);
 464
 465    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 466       struct pipe_texture *tex = i < num ? texture[i] : NULL;
 467
 468       if(tex) {
 469          struct llvmpipe_texture *lp_tex = llvmpipe_texture(tex);
 470          struct lp_jit_texture *jit_tex;
 471          jit_tex = &setup->fs.current.jit_context.textures[i];
 472          jit_tex->width = tex->width0;
 473          jit_tex->height = tex->height0;
 474          jit_tex->depth = tex->depth0;
 475          jit_tex->last_level = tex->last_level;
 476          if (!lp_tex->dt) {
 477             /* regular texture - setup array of mipmap level pointers */
 478             int j;
 479             for (j = 0; j <= tex->last_level; j++) {
 480                jit_tex->data[j] =
 481                   (ubyte *) lp_tex->data + lp_tex->level_offset[j];
 482                jit_tex->row_stride[j] = lp_tex->stride[j];
 483             }
 484          }
 485          else {
 486             /* display target texture/surface */
 487             /*
 488              * XXX: Where should this be unmapped?
 489              */
 490
 491             struct llvmpipe_screen *screen = llvmpipe_screen(tex->screen);
 492             struct sw_winsys *winsys = screen->winsys;
 493             jit_tex->data[0] = winsys->displaytarget_map(winsys, lp_tex->dt,
 494                                                       PIPE_BUFFER_USAGE_CPU_READ);
 495             jit_tex->row_stride[0] = lp_tex->stride[0];
 496             assert(jit_tex->data[0]);
 497          }
 498
 499          /* the scene references this texture */
 500          {
 501             struct lp_scene *scene = lp_setup_get_current_scene(setup);
 502             lp_scene_texture_reference(scene, tex);
 503          }
 504       }
 505    }
 506
 507    setup->dirty |= LP_SETUP_NEW_FS;
 508 }
 509
 510
 511 /**
 512  * Is the given texture referenced by any scene?
 513  * Note: we have to check all scenes including any scenes currently
 514  * being rendered and the current scene being built.
 515  */
 516 unsigned
 517 lp_setup_is_texture_referenced( const struct lp_setup_context *setup,
 518                                 const struct pipe_texture *texture )
 519 {
 520    unsigned i;
 521
 522    /* check the render targets */
 523    for (i = 0; i < setup->fb.nr_cbufs; i++) {
 524       if (setup->fb.cbufs[i]->texture == texture)
 525          return PIPE_REFERENCED_FOR_READ | PIPE_REFERENCED_FOR_WRITE;
 526    }
 527    if (setup->fb.zsbuf && setup->fb.zsbuf->texture == texture) {
 528       return PIPE_REFERENCED_FOR_READ | PIPE_REFERENCED_FOR_WRITE;
 529    }
 530
 531    /* check textures referenced by the scene */
 532    for (i = 0; i < Elements(setup->scenes); i++) {
 533       if (lp_scene_is_texture_referenced(setup->scenes[i], texture)) {
 534          return PIPE_REFERENCED_FOR_READ;
 535       }
 536    }
 537
 538    return PIPE_UNREFERENCED;
 539 }
 540
 541
 542 /**
 543  * Called by vbuf code when we're about to draw something.
 544  */
 545 void
 546 lp_setup_update_state( struct lp_setup_context *setup )
 547 {
 548    struct lp_scene *scene = lp_setup_get_current_scene(setup);
 549
 550    LP_DBG(DEBUG_SETUP, "%s\n", __FUNCTION__);
 551
 552    assert(setup->fs.current.jit_function);
 553
 554    if(setup->dirty & LP_SETUP_NEW_BLEND_COLOR) {
 555       uint8_t *stored;
 556       unsigned i, j;
 557
 558       stored = lp_scene_alloc_aligned(scene, 4 * 16, 16);
 559
 560       /* smear each blend color component across 16 ubyte elements */
 561       for (i = 0; i < 4; ++i) {
 562          uint8_t c = float_to_ubyte(setup->blend_color.current.color[i]);
 563          for (j = 0; j < 16; ++j)
 564             stored[i*16 + j] = c;
 565       }
 566
 567       setup->blend_color.stored = stored;
 568
 569       setup->fs.current.jit_context.blend_color = setup->blend_color.stored;
 570       setup->dirty |= LP_SETUP_NEW_FS;
 571    }
 572
 573    if (setup->dirty & LP_SETUP_NEW_SCISSOR) {
 574       float *stored;
 575
 576       stored = lp_scene_alloc_aligned(scene, 4 * sizeof(int32_t), 16);
 577
 578       stored[0] = (float) setup->scissor.current.minx;
 579       stored[1] = (float) setup->scissor.current.miny;
 580       stored[2] = (float) setup->scissor.current.maxx;
 581       stored[3] = (float) setup->scissor.current.maxy;
 582
 583       setup->scissor.stored = stored;
 584
 585       setup->fs.current.jit_context.scissor_xmin = stored[0];
 586       setup->fs.current.jit_context.scissor_ymin = stored[1];
 587       setup->fs.current.jit_context.scissor_xmax = stored[2];
 588       setup->fs.current.jit_context.scissor_ymax = stored[3];
 589
 590       setup->dirty |= LP_SETUP_NEW_FS;
 591    }
 592
 593    if(setup->dirty & LP_SETUP_NEW_CONSTANTS) {
 594       struct pipe_buffer *buffer = setup->constants.current;
 595
 596       if(buffer) {
 597          unsigned current_size = buffer->size;
 598          const void *current_data = llvmpipe_buffer(buffer)->data;
 599
 600          /* TODO: copy only the actually used constants? */
 601
 602          if(setup->constants.stored_size != current_size ||
 603             !setup->constants.stored_data ||
 604             memcmp(setup->constants.stored_data,
 605                    current_data,
 606                    current_size) != 0) {
 607             void *stored;
 608
 609             stored = lp_scene_alloc(scene, current_size);
 610             if(stored) {
 611                memcpy(stored,
 612                       current_data,
 613                       current_size);
 614                setup->constants.stored_size = current_size;
 615                setup->constants.stored_data = stored;
 616             }
 617          }
 618       }
 619       else {
 620          setup->constants.stored_size = 0;
 621          setup->constants.stored_data = NULL;
 622       }
 623
 624       setup->fs.current.jit_context.constants = setup->constants.stored_data;
 625       setup->dirty |= LP_SETUP_NEW_FS;
 626    }
 627
 628
 629    if(setup->dirty & LP_SETUP_NEW_FS) {
 630       if(!setup->fs.stored ||
 631          memcmp(setup->fs.stored,
 632                 &setup->fs.current,
 633                 sizeof setup->fs.current) != 0) {
 634          /* The fs state that's been stored in the scene is different from
 635           * the new, current state.  So allocate a new lp_rast_state object
 636           * and append it to the bin's setup data buffer.
 637           */
 638          struct lp_rast_state *stored =
 639             (struct lp_rast_state *) lp_scene_alloc(scene, sizeof *stored);
 640          if(stored) {
 641             memcpy(stored,
 642                    &setup->fs.current,
 643                    sizeof setup->fs.current);
 644             setup->fs.stored = stored;
 645
 646             /* put the state-set command into all bins */
 647             lp_scene_bin_state_command( scene,
 648                                         lp_rast_set_state,
 649                                         lp_rast_arg_state(setup->fs.stored) );
 650          }
 651       }
 652    }
 653
 654    setup->dirty = 0;
 655
 656    assert(setup->fs.stored);
 657 }
 658
 659
 660
 661 /* Only caller is lp_setup_vbuf_destroy()
 662  */
 663 void
 664 lp_setup_destroy( struct lp_setup_context *setup )
 665 {
 666    reset_context( setup );
 667
 668    pipe_buffer_reference(&setup->constants.current, NULL);
 669
 670    /* free the scenes in the 'empty' queue */
 671    while (1) {
 672       struct lp_scene *scene = lp_scene_dequeue(setup->empty_scenes, FALSE);
 673       if (!scene)
 674          break;
 675       lp_scene_destroy(scene);
 676    }
 677
 678    lp_rast_destroy( setup->rast );
 679
 680    FREE( setup );
 681 }
 682
 683
 684 /**
 685  * Create a new primitive tiling engine.  Plug it into the backend of
 686  * the draw module.  Currently also creates a rasterizer to use with
 687  * it.
 688  */
 689 struct lp_setup_context *
 690 lp_setup_create( struct pipe_context *pipe,
 691                  struct draw_context *draw )
 692 {
 693    unsigned i;
 694    struct lp_setup_context *setup = CALLOC_STRUCT(lp_setup_context);
 695
 696    if (!setup)
 697       return NULL;
 698
 699    lp_setup_init_vbuf(setup);
 700
 701    setup->empty_scenes = lp_scene_queue_create();
 702    if (!setup->empty_scenes)
 703       goto fail;
 704
 705    /* XXX: move this to the screen and share between contexts:
 706     */
 707    setup->rast = lp_rast_create();
 708    if (!setup->rast)
 709       goto fail;
 710
 711    setup->vbuf = draw_vbuf_stage(draw, &setup->base);
 712    if (!setup->vbuf)
 713       goto fail;
 714
 715    draw_set_rasterize_stage(draw, setup->vbuf);
 716    draw_set_render(draw, &setup->base);
 717
 718    /* create some empty scenes */
 719    for (i = 0; i < MAX_SCENES; i++) {
 720       setup->scenes[i] = lp_scene_create( pipe, setup->empty_scenes );
 721
 722       lp_scene_enqueue(setup->empty_scenes, setup->scenes[i]);
 723    }
 724
 725    setup->triangle = first_triangle;
 726    setup->line     = first_line;
 727    setup->point    = first_point;
 728
 729    setup->dirty = ~0;
 730
 731    return setup;
 732
 733 fail:
 734    if (setup->rast)
 735       lp_rast_destroy( setup->rast );
 736
 737    if (setup->vbuf)
 738       ;
 739
 740    if (setup->empty_scenes)
 741       lp_scene_queue_destroy(setup->empty_scenes);
 742
 743    FREE(setup);
 744    return NULL;
 745 }
 746