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