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
  61       /* wait for a free/empty scene
  62        */
  63       setup->scene = lp_scene_dequeue(setup->empty_scenes, TRUE);
  64
  65       if(0)lp_scene_reset( setup->scene ); /* XXX temporary? */
  66
  67       lp_scene_set_framebuffer_size(setup->scene,
  68                                     setup->fb.width,
  69                                     setup->fb.height);
  70    }
  71    return setup->scene;
  72 }
  73
  74
  75 static void
  76 first_triangle( struct setup_context *setup,
  77                 const float (*v0)[4],
  78                 const float (*v1)[4],
  79                 const float (*v2)[4])
  80 {
  81    set_scene_state( setup, SETUP_ACTIVE );
  82    lp_setup_choose_triangle( setup );
  83    setup->triangle( setup, v0, v1, v2 );
  84 }
  85
  86 static void
  87 first_line( struct setup_context *setup,
  88             const float (*v0)[4],
  89             const float (*v1)[4])
  90 {
  91    set_scene_state( setup, SETUP_ACTIVE );
  92    lp_setup_choose_line( setup );
  93    setup->line( setup, v0, v1 );
  94 }
  95
  96 static void
  97 first_point( struct setup_context *setup,
  98              const float (*v0)[4])
  99 {
 100    set_scene_state( setup, SETUP_ACTIVE );
 101    lp_setup_choose_point( setup );
 102    setup->point( setup, v0 );
 103 }
 104
 105 static void reset_context( struct setup_context *setup )
 106 {
 107    LP_DBG(DEBUG_SETUP, "%s\n", __FUNCTION__);
 108
 109    /* Reset derived state */
 110    setup->constants.stored_size = 0;
 111    setup->constants.stored_data = NULL;
 112    setup->fs.stored = NULL;
 113    setup->dirty = ~0;
 114
 115    /* no current bin */
 116    setup->scene = NULL;
 117
 118    /* Reset some state:
 119     */
 120    setup->clear.flags = 0;
 121
 122    /* Have an explicit "start-binning" call and get rid of this
 123     * pointer twiddling?
 124     */
 125    setup->line = first_line;
 126    setup->point = first_point;
 127    setup->triangle = first_triangle;
 128 }
 129
 130
 131 /** Rasterize all scene's bins */
 132 static void
 133 lp_setup_rasterize_scene( struct setup_context *setup,
 134                          boolean write_depth )
 135 {
 136    struct lp_scene *scene = lp_setup_get_current_scene(setup);
 137
 138    lp_rasterize_scene(setup->rast,
 139                       scene,
 140                       &setup->fb,
 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 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       else
 176          lp_scene_bin_everywhere( scene,
 177                                   lp_rast_load_zstencil,
 178                                   lp_rast_arg_null() );
 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    scene = lp_setup_get_current_scene(setup);
 257
 258    util_copy_framebuffer_state(&setup->fb, fb);
 259
 260    lp_scene_set_framebuffer_size(scene, setup->fb.width, setup->fb.height);
 261 }
 262
 263
 264 void
 265 lp_setup_clear( struct setup_context *setup,
 266                 const float *color,
 267                 double depth,
 268                 unsigned stencil,
 269                 unsigned flags )
 270 {
 271    struct lp_scene *scene = lp_setup_get_current_scene(setup);
 272    unsigned i;
 273
 274    LP_DBG(DEBUG_SETUP, "%s state %d\n", __FUNCTION__, setup->state);
 275
 276
 277    if (flags & PIPE_CLEAR_COLOR) {
 278       for (i = 0; i < 4; ++i)
 279          setup->clear.color.clear_color[i] = float_to_ubyte(color[i]);
 280    }
 281
 282    if (flags & PIPE_CLEAR_DEPTHSTENCIL) {
 283       setup->clear.zstencil.clear_zstencil =
 284          util_pack_z_stencil(setup->fb.zsbuf->format,
 285                              depth,
 286                              stencil);
 287    }
 288
 289    if (setup->state == SETUP_ACTIVE) {
 290       /* Add the clear to existing scene.  In the unusual case where
 291        * both color and depth-stencil are being cleared when there's
 292        * already been some rendering, we could discard the currently
 293        * binned scene and start again, but I don't see that as being
 294        * a common usage.
 295        */
 296       if (flags & PIPE_CLEAR_COLOR)
 297          lp_scene_bin_everywhere( scene,
 298                                   lp_rast_clear_color,
 299                                   setup->clear.color );
 300
 301       if (setup->clear.flags & PIPE_CLEAR_DEPTHSTENCIL)
 302          lp_scene_bin_everywhere( scene,
 303                                   lp_rast_clear_zstencil,
 304                                   setup->clear.zstencil );
 305    }
 306    else {
 307       /* Put ourselves into the 'pre-clear' state, specifically to try
 308        * and accumulate multiple clears to color and depth_stencil
 309        * buffers which the app or state-tracker might issue
 310        * separately.
 311        */
 312       set_scene_state( setup, SETUP_CLEARED );
 313
 314       setup->clear.flags |= flags;
 315    }
 316 }
 317
 318
 319 /**
 320  * Emit a fence.
 321  */
 322 struct pipe_fence_handle *
 323 lp_setup_fence( struct setup_context *setup )
 324 {
 325    struct lp_scene *scene = lp_setup_get_current_scene(setup);
 326    const unsigned rank = lp_scene_get_num_bins( scene ); /* xxx */
 327    struct lp_fence *fence = lp_fence_create(rank);
 328
 329    LP_DBG(DEBUG_SETUP, "%s rank %u\n", __FUNCTION__, rank);
 330
 331    set_scene_state( setup, SETUP_ACTIVE );
 332
 333    /* insert the fence into all command bins */
 334    lp_scene_bin_everywhere( scene,
 335                             lp_rast_fence,
 336                             lp_rast_arg_fence(fence) );
 337
 338    return (struct pipe_fence_handle *) fence;
 339 }
 340
 341
 342 void
 343 lp_setup_set_triangle_state( struct setup_context *setup,
 344                              unsigned cull_mode,
 345                              boolean ccw_is_frontface,
 346                              boolean scissor )
 347 {
 348    LP_DBG(DEBUG_SETUP, "%s\n", __FUNCTION__);
 349
 350    setup->ccw_is_frontface = ccw_is_frontface;
 351    setup->cullmode = cull_mode;
 352    setup->triangle = first_triangle;
 353    setup->scissor_test = scissor;
 354 }
 355
 356
 357
 358 void
 359 lp_setup_set_fs_inputs( struct setup_context *setup,
 360                         const struct lp_shader_input *input,
 361                         unsigned nr )
 362 {
 363    LP_DBG(DEBUG_SETUP, "%s %p %u\n", __FUNCTION__, (void *) input, nr);
 364
 365    memcpy( setup->fs.input, input, nr * sizeof input[0] );
 366    setup->fs.nr_inputs = nr;
 367 }
 368
 369 void
 370 lp_setup_set_fs_functions( struct setup_context *setup,
 371                            lp_jit_frag_func jit_function0,
 372                            lp_jit_frag_func jit_function1,
 373                            boolean opaque )
 374 {
 375    LP_DBG(DEBUG_SETUP, "%s %p\n", __FUNCTION__, (void *) jit_function0);
 376    /* FIXME: reference count */
 377
 378    setup->fs.current.jit_function[0] = jit_function0;
 379    setup->fs.current.jit_function[1] = jit_function1;
 380    setup->fs.current.opaque = opaque;
 381    setup->dirty |= LP_SETUP_NEW_FS;
 382 }
 383
 384 void
 385 lp_setup_set_fs_constants(struct setup_context *setup,
 386                           struct pipe_buffer *buffer)
 387 {
 388    LP_DBG(DEBUG_SETUP, "%s %p\n", __FUNCTION__, (void *) buffer);
 389
 390    pipe_buffer_reference(&setup->constants.current, buffer);
 391
 392    setup->dirty |= LP_SETUP_NEW_CONSTANTS;
 393 }
 394
 395
 396 void
 397 lp_setup_set_alpha_ref_value( struct setup_context *setup,
 398                               float alpha_ref_value )
 399 {
 400    LP_DBG(DEBUG_SETUP, "%s %f\n", __FUNCTION__, alpha_ref_value);
 401
 402    if(setup->fs.current.jit_context.alpha_ref_value != alpha_ref_value) {
 403       setup->fs.current.jit_context.alpha_ref_value = alpha_ref_value;
 404       setup->dirty |= LP_SETUP_NEW_FS;
 405    }
 406 }
 407
 408 void
 409 lp_setup_set_blend_color( struct setup_context *setup,
 410                           const struct pipe_blend_color *blend_color )
 411 {
 412    LP_DBG(DEBUG_SETUP, "%s\n", __FUNCTION__);
 413
 414    assert(blend_color);
 415
 416    if(memcmp(&setup->blend_color.current, blend_color, sizeof *blend_color) != 0) {
 417       memcpy(&setup->blend_color.current, blend_color, sizeof *blend_color);
 418       setup->dirty |= LP_SETUP_NEW_BLEND_COLOR;
 419    }
 420 }
 421
 422
 423 void
 424 lp_setup_set_scissor( struct setup_context *setup,
 425                       const struct pipe_scissor_state *scissor )
 426 {
 427    LP_DBG(DEBUG_SETUP, "%s\n", __FUNCTION__);
 428
 429    assert(scissor);
 430
 431    if (memcmp(&setup->scissor.current, scissor, sizeof(*scissor)) != 0) {
 432       setup->scissor.current = *scissor; /* struct copy */
 433       setup->dirty |= LP_SETUP_NEW_SCISSOR;
 434    }
 435 }
 436
 437
 438 void
 439 lp_setup_set_flatshade_first( struct setup_context *setup,
 440                               boolean flatshade_first )
 441 {
 442    setup->flatshade_first = flatshade_first;
 443 }
 444
 445
 446 void
 447 lp_setup_set_vertex_info( struct setup_context *setup,
 448                           struct vertex_info *vertex_info )
 449 {
 450    /* XXX: just silently holding onto the pointer:
 451     */
 452    setup->vertex_info = vertex_info;
 453 }
 454
 455
 456 /**
 457  * Called during state validation when LP_NEW_TEXTURE is set.
 458  */
 459 void
 460 lp_setup_set_sampler_textures( struct setup_context *setup,
 461                                unsigned num, struct pipe_texture **texture)
 462 {
 463    unsigned i;
 464
 465    LP_DBG(DEBUG_SETUP, "%s\n", __FUNCTION__);
 466
 467    assert(num <= PIPE_MAX_SAMPLERS);
 468
 469    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 470       struct pipe_texture *tex = i < num ? texture[i] : NULL;
 471
 472       if(tex) {
 473          struct llvmpipe_texture *lp_tex = llvmpipe_texture(tex);
 474          struct lp_jit_texture *jit_tex;
 475          jit_tex = &setup->fs.current.jit_context.textures[i];
 476          jit_tex->width = tex->width0;
 477          jit_tex->height = tex->height0;
 478          jit_tex->stride = lp_tex->stride[0];
 479          if(!lp_tex->dt)
 480             jit_tex->data = lp_tex->data;
 481          else
 482             /* FIXME: map the rendertarget */
 483             assert(0);
 484
 485          /* the scene references this texture */
 486          {
 487             struct lp_scene *scene = lp_setup_get_current_scene(setup);
 488             lp_scene_texture_reference(scene, tex);
 489          }
 490       }
 491    }
 492
 493    setup->dirty |= LP_SETUP_NEW_FS;
 494 }
 495
 496
 497 /**
 498  * Is the given texture referenced by any scene?
 499  * Note: we have to check all scenes including any scenes currently
 500  * being rendered and the current scene being built.
 501  */
 502 unsigned
 503 lp_setup_is_texture_referenced( const struct setup_context *setup,
 504                                 const struct pipe_texture *texture )
 505 {
 506    unsigned i;
 507
 508    /* check the render targets */
 509    for (i = 0; i < setup->fb.nr_cbufs; i++) {
 510       if (setup->fb.cbufs[i]->texture == texture)
 511          return PIPE_REFERENCED_FOR_READ | PIPE_REFERENCED_FOR_WRITE;
 512    }
 513    if (setup->fb.zsbuf && setup->fb.zsbuf->texture == texture) {
 514       return PIPE_REFERENCED_FOR_READ | PIPE_REFERENCED_FOR_WRITE;
 515    }
 516
 517    /* check textures referenced by the scene */
 518    for (i = 0; i < Elements(setup->scenes); i++) {
 519       if (lp_scene_is_textured_referenced(setup->scenes[i], texture)) {
 520          return PIPE_REFERENCED_FOR_READ;
 521       }
 522    }
 523
 524    return PIPE_UNREFERENCED;
 525 }
 526
 527
 528 /**
 529  * Called by vbuf code when we're about to draw something.
 530  */
 531 void
 532 lp_setup_update_state( struct setup_context *setup )
 533 {
 534    struct lp_scene *scene = lp_setup_get_current_scene(setup);
 535
 536    LP_DBG(DEBUG_SETUP, "%s\n", __FUNCTION__);
 537
 538    assert(setup->fs.current.jit_function);
 539
 540    if(setup->dirty & LP_SETUP_NEW_BLEND_COLOR) {
 541       uint8_t *stored;
 542       unsigned i, j;
 543
 544       stored = lp_scene_alloc_aligned(scene, 4 * 16, 16);
 545
 546       /* smear each blend color component across 16 ubyte elements */
 547       for (i = 0; i < 4; ++i) {
 548          uint8_t c = float_to_ubyte(setup->blend_color.current.color[i]);
 549          for (j = 0; j < 16; ++j)
 550             stored[i*16 + j] = c;
 551       }
 552
 553       setup->blend_color.stored = stored;
 554
 555       setup->fs.current.jit_context.blend_color = setup->blend_color.stored;
 556       setup->dirty |= LP_SETUP_NEW_FS;
 557    }
 558
 559    if (setup->dirty & LP_SETUP_NEW_SCISSOR) {
 560       float *stored;
 561
 562       stored = lp_scene_alloc_aligned(scene, 4 * sizeof(int32_t), 16);
 563
 564       stored[0] = (float) setup->scissor.current.minx;
 565       stored[1] = (float) setup->scissor.current.miny;
 566       stored[2] = (float) setup->scissor.current.maxx;
 567       stored[3] = (float) setup->scissor.current.maxy;
 568
 569       setup->scissor.stored = stored;
 570
 571       setup->fs.current.jit_context.scissor_xmin = stored[0];
 572       setup->fs.current.jit_context.scissor_ymin = stored[1];
 573       setup->fs.current.jit_context.scissor_xmax = stored[2];
 574       setup->fs.current.jit_context.scissor_ymax = stored[3];
 575
 576       setup->dirty |= LP_SETUP_NEW_FS;
 577    }
 578
 579    if(setup->dirty & LP_SETUP_NEW_CONSTANTS) {
 580       struct pipe_buffer *buffer = setup->constants.current;
 581
 582       if(buffer) {
 583          unsigned current_size = buffer->size;
 584          const void *current_data = llvmpipe_buffer(buffer)->data;
 585
 586          /* TODO: copy only the actually used constants? */
 587
 588          if(setup->constants.stored_size != current_size ||
 589             !setup->constants.stored_data ||
 590             memcmp(setup->constants.stored_data,
 591                    current_data,
 592                    current_size) != 0) {
 593             void *stored;
 594
 595             stored = lp_scene_alloc(scene, current_size);
 596             if(stored) {
 597                memcpy(stored,
 598                       current_data,
 599                       current_size);
 600                setup->constants.stored_size = current_size;
 601                setup->constants.stored_data = stored;
 602             }
 603          }
 604       }
 605       else {
 606          setup->constants.stored_size = 0;
 607          setup->constants.stored_data = NULL;
 608       }
 609
 610       setup->fs.current.jit_context.constants = setup->constants.stored_data;
 611       setup->dirty |= LP_SETUP_NEW_FS;
 612    }
 613
 614
 615    if(setup->dirty & LP_SETUP_NEW_FS) {
 616       if(!setup->fs.stored ||
 617          memcmp(setup->fs.stored,
 618                 &setup->fs.current,
 619                 sizeof setup->fs.current) != 0) {
 620          /* The fs state that's been stored in the scene is different from
 621           * the new, current state.  So allocate a new lp_rast_state object
 622           * and append it to the bin's setup data buffer.
 623           */
 624          struct lp_rast_state *stored =
 625             (struct lp_rast_state *) lp_scene_alloc(scene, sizeof *stored);
 626          if(stored) {
 627             memcpy(stored,
 628                    &setup->fs.current,
 629                    sizeof setup->fs.current);
 630             setup->fs.stored = stored;
 631
 632             /* put the state-set command into all bins */
 633             lp_scene_bin_state_command( scene,
 634                                         lp_rast_set_state,
 635                                         lp_rast_arg_state(setup->fs.stored) );
 636          }
 637       }
 638    }
 639
 640    setup->dirty = 0;
 641
 642    assert(setup->fs.stored);
 643 }
 644
 645
 646
 647 /* Only caller is lp_setup_vbuf_destroy()
 648  */
 649 void
 650 lp_setup_destroy( struct setup_context *setup )
 651 {
 652    reset_context( setup );
 653
 654    pipe_buffer_reference(&setup->constants.current, NULL);
 655
 656    /* free the scenes in the 'empty' queue */
 657    while (1) {
 658       struct lp_scene *scene = lp_scene_dequeue(setup->empty_scenes, FALSE);
 659       if (!scene)
 660          break;
 661       lp_scene_destroy(scene);
 662    }
 663
 664    lp_rast_destroy( setup->rast );
 665
 666    FREE( setup );
 667 }
 668
 669
 670 /**
 671  * Create a new primitive tiling engine.  Plug it into the backend of
 672  * the draw module.  Currently also creates a rasterizer to use with
 673  * it.
 674  */
 675 struct setup_context *
 676 lp_setup_create( struct pipe_screen *screen,
 677                  struct draw_context *draw )
 678 {
 679    unsigned i;
 680    struct setup_context *setup = CALLOC_STRUCT(setup_context);
 681
 682    if (!setup)
 683       return NULL;
 684
 685    lp_setup_init_vbuf(setup);
 686
 687    setup->empty_scenes = lp_scene_queue_create();
 688    if (!setup->empty_scenes)
 689       goto fail;
 690
 691    setup->rast = lp_rast_create( screen, setup->empty_scenes );
 692    if (!setup->rast)
 693       goto fail;
 694
 695    setup->vbuf = draw_vbuf_stage(draw, &setup->base);
 696    if (!setup->vbuf)
 697       goto fail;
 698
 699    draw_set_rasterize_stage(draw, setup->vbuf);
 700    draw_set_render(draw, &setup->base);
 701
 702    /* create some empty scenes */
 703    for (i = 0; i < MAX_SCENES; i++) {
 704       setup->scenes[i] = lp_scene_create();
 705       lp_scene_enqueue(setup->empty_scenes, setup->scenes[i]);
 706    }
 707
 708    setup->triangle = first_triangle;
 709    setup->line     = first_line;
 710    setup->point    = first_point;
 711
 712    setup->dirty = ~0;
 713
 714    return setup;
 715
 716 fail:
 717    if (setup->rast)
 718       lp_rast_destroy( setup->rast );
 719
 720    if (setup->vbuf)
 721       ;
 722
 723    if (setup->empty_scenes)
 724       lp_scene_queue_destroy(setup->empty_scenes);
 725
 726    FREE(setup);
 727    return NULL;
 728 }
 729