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