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
  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    }
 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 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 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 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 setup_context *setup,
 243                            const struct pipe_framebuffer_state *fb )
 244 {
 245    struct lp_scene *scene = lp_setup_get_current_scene(setup);
 246
 247    LP_DBG(DEBUG_SETUP, "%s\n", __FUNCTION__);
 248
 249    set_scene_state( setup, SETUP_FLUSHED );
 250
 251    /* re-get scene pointer, may have a new scene after flushing */
 252    scene = lp_setup_get_current_scene(setup);
 253
 254    util_copy_framebuffer_state(&setup->fb, fb);
 255
 256    lp_scene_set_framebuffer_size(scene, setup->fb.width, setup->fb.height);
 257 }
 258
 259
 260 void
 261 lp_setup_clear( struct setup_context *setup,
 262                 const float *color,
 263                 double depth,
 264                 unsigned stencil,
 265                 unsigned flags )
 266 {
 267    struct lp_scene *scene = lp_setup_get_current_scene(setup);
 268    unsigned i;
 269
 270    LP_DBG(DEBUG_SETUP, "%s state %d\n", __FUNCTION__, setup->state);
 271
 272
 273    if (flags & PIPE_CLEAR_COLOR) {
 274       for (i = 0; i < 4; ++i)
 275          setup->clear.color.clear_color[i] = float_to_ubyte(color[i]);
 276    }
 277
 278    if (flags & PIPE_CLEAR_DEPTHSTENCIL) {
 279       setup->clear.zstencil.clear_zstencil =
 280          util_pack_z_stencil(setup->fb.zsbuf->format,
 281                              depth,
 282                              stencil);
 283    }
 284
 285    if (setup->state == SETUP_ACTIVE) {
 286       /* Add the clear to existing scene.  In the unusual case where
 287        * both color and depth-stencil are being cleared when there's
 288        * already been some rendering, we could discard the currently
 289        * binned scene and start again, but I don't see that as being
 290        * a common usage.
 291        */
 292       if (flags & PIPE_CLEAR_COLOR)
 293          lp_scene_bin_everywhere( scene,
 294                                   lp_rast_clear_color,
 295                                   setup->clear.color );
 296
 297       if (setup->clear.flags & PIPE_CLEAR_DEPTHSTENCIL)
 298          lp_scene_bin_everywhere( scene,
 299                                   lp_rast_clear_zstencil,
 300                                   setup->clear.zstencil );
 301    }
 302    else {
 303       /* Put ourselves into the 'pre-clear' state, specifically to try
 304        * and accumulate multiple clears to color and depth_stencil
 305        * buffers which the app or state-tracker might issue
 306        * separately.
 307        */
 308       set_scene_state( setup, SETUP_CLEARED );
 309
 310       setup->clear.flags |= flags;
 311    }
 312 }
 313
 314
 315 /**
 316  * Emit a fence.
 317  */
 318 struct pipe_fence_handle *
 319 lp_setup_fence( struct setup_context *setup )
 320 {
 321    struct lp_scene *scene = lp_setup_get_current_scene(setup);
 322    const unsigned rank = lp_scene_get_num_bins( scene ); /* xxx */
 323    struct lp_fence *fence = lp_fence_create(rank);
 324
 325    LP_DBG(DEBUG_SETUP, "%s rank %u\n", __FUNCTION__, rank);
 326
 327    set_scene_state( setup, SETUP_ACTIVE );
 328
 329    /* insert the fence into all command bins */
 330    lp_scene_bin_everywhere( scene,
 331                             lp_rast_fence,
 332                             lp_rast_arg_fence(fence) );
 333
 334    return (struct pipe_fence_handle *) fence;
 335 }
 336
 337
 338 void
 339 lp_setup_set_triangle_state( struct setup_context *setup,
 340                              unsigned cull_mode,
 341                              boolean ccw_is_frontface,
 342                              boolean scissor )
 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    setup->scissor_test = scissor;
 350 }
 351
 352
 353
 354 void
 355 lp_setup_set_fs_inputs( struct 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 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 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 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 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 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 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 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 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->stride = lp_tex->stride[0];
 475          if(!lp_tex->dt)
 476             jit_tex->data = lp_tex->data;
 477          else
 478             /* FIXME: map the rendertarget */
 479             assert(0);
 480
 481          /* the scene references this texture */
 482          {
 483             struct lp_scene *scene = lp_setup_get_current_scene(setup);
 484             lp_scene_texture_reference(scene, tex);
 485          }
 486       }
 487    }
 488
 489    setup->dirty |= LP_SETUP_NEW_FS;
 490 }
 491
 492
 493 /**
 494  * Is the given texture referenced by any scene?
 495  * Note: we have to check all scenes including any scenes currently
 496  * being rendered and the current scene being built.
 497  */
 498 unsigned
 499 lp_setup_is_texture_referenced( const struct setup_context *setup,
 500                                 const struct pipe_texture *texture )
 501 {
 502    unsigned i;
 503
 504    /* check the render targets */
 505    for (i = 0; i < setup->fb.nr_cbufs; i++) {
 506       if (setup->fb.cbufs[i]->texture == texture)
 507          return PIPE_REFERENCED_FOR_READ | PIPE_REFERENCED_FOR_WRITE;
 508    }
 509    if (setup->fb.zsbuf && setup->fb.zsbuf->texture == texture) {
 510       return PIPE_REFERENCED_FOR_READ | PIPE_REFERENCED_FOR_WRITE;
 511    }
 512
 513    /* check textures referenced by the scene */
 514    for (i = 0; i < Elements(setup->scenes); i++) {
 515       if (lp_scene_is_texture_referenced(setup->scenes[i], texture)) {
 516          return PIPE_REFERENCED_FOR_READ;
 517       }
 518    }
 519
 520    return PIPE_UNREFERENCED;
 521 }
 522
 523
 524 /**
 525  * Called by vbuf code when we're about to draw something.
 526  */
 527 void
 528 lp_setup_update_state( struct setup_context *setup )
 529 {
 530    struct lp_scene *scene = lp_setup_get_current_scene(setup);
 531
 532    LP_DBG(DEBUG_SETUP, "%s\n", __FUNCTION__);
 533
 534    assert(setup->fs.current.jit_function);
 535
 536    if(setup->dirty & LP_SETUP_NEW_BLEND_COLOR) {
 537       uint8_t *stored;
 538       unsigned i, j;
 539
 540       stored = lp_scene_alloc_aligned(scene, 4 * 16, 16);
 541
 542       /* smear each blend color component across 16 ubyte elements */
 543       for (i = 0; i < 4; ++i) {
 544          uint8_t c = float_to_ubyte(setup->blend_color.current.color[i]);
 545          for (j = 0; j < 16; ++j)
 546             stored[i*16 + j] = c;
 547       }
 548
 549       setup->blend_color.stored = stored;
 550
 551       setup->fs.current.jit_context.blend_color = setup->blend_color.stored;
 552       setup->dirty |= LP_SETUP_NEW_FS;
 553    }
 554
 555    if (setup->dirty & LP_SETUP_NEW_SCISSOR) {
 556       float *stored;
 557
 558       stored = lp_scene_alloc_aligned(scene, 4 * sizeof(int32_t), 16);
 559
 560       stored[0] = (float) setup->scissor.current.minx;
 561       stored[1] = (float) setup->scissor.current.miny;
 562       stored[2] = (float) setup->scissor.current.maxx;
 563       stored[3] = (float) setup->scissor.current.maxy;
 564
 565       setup->scissor.stored = stored;
 566
 567       setup->fs.current.jit_context.scissor_xmin = stored[0];
 568       setup->fs.current.jit_context.scissor_ymin = stored[1];
 569       setup->fs.current.jit_context.scissor_xmax = stored[2];
 570       setup->fs.current.jit_context.scissor_ymax = stored[3];
 571
 572       setup->dirty |= LP_SETUP_NEW_FS;
 573    }
 574
 575    if(setup->dirty & LP_SETUP_NEW_CONSTANTS) {
 576       struct pipe_buffer *buffer = setup->constants.current;
 577
 578       if(buffer) {
 579          unsigned current_size = buffer->size;
 580          const void *current_data = llvmpipe_buffer(buffer)->data;
 581
 582          /* TODO: copy only the actually used constants? */
 583
 584          if(setup->constants.stored_size != current_size ||
 585             !setup->constants.stored_data ||
 586             memcmp(setup->constants.stored_data,
 587                    current_data,
 588                    current_size) != 0) {
 589             void *stored;
 590
 591             stored = lp_scene_alloc(scene, current_size);
 592             if(stored) {
 593                memcpy(stored,
 594                       current_data,
 595                       current_size);
 596                setup->constants.stored_size = current_size;
 597                setup->constants.stored_data = stored;
 598             }
 599          }
 600       }
 601       else {
 602          setup->constants.stored_size = 0;
 603          setup->constants.stored_data = NULL;
 604       }
 605
 606       setup->fs.current.jit_context.constants = setup->constants.stored_data;
 607       setup->dirty |= LP_SETUP_NEW_FS;
 608    }
 609
 610
 611    if(setup->dirty & LP_SETUP_NEW_FS) {
 612       if(!setup->fs.stored ||
 613          memcmp(setup->fs.stored,
 614                 &setup->fs.current,
 615                 sizeof setup->fs.current) != 0) {
 616          /* The fs state that's been stored in the scene is different from
 617           * the new, current state.  So allocate a new lp_rast_state object
 618           * and append it to the bin's setup data buffer.
 619           */
 620          struct lp_rast_state *stored =
 621             (struct lp_rast_state *) lp_scene_alloc(scene, sizeof *stored);
 622          if(stored) {
 623             memcpy(stored,
 624                    &setup->fs.current,
 625                    sizeof setup->fs.current);
 626             setup->fs.stored = stored;
 627
 628             /* put the state-set command into all bins */
 629             lp_scene_bin_state_command( scene,
 630                                         lp_rast_set_state,
 631                                         lp_rast_arg_state(setup->fs.stored) );
 632          }
 633       }
 634    }
 635
 636    setup->dirty = 0;
 637
 638    assert(setup->fs.stored);
 639 }
 640
 641
 642
 643 /* Only caller is lp_setup_vbuf_destroy()
 644  */
 645 void
 646 lp_setup_destroy( struct setup_context *setup )
 647 {
 648    reset_context( setup );
 649
 650    pipe_buffer_reference(&setup->constants.current, NULL);
 651
 652    /* free the scenes in the 'empty' queue */
 653    while (1) {
 654       struct lp_scene *scene = lp_scene_dequeue(setup->empty_scenes, FALSE);
 655       if (!scene)
 656          break;
 657       lp_scene_destroy(scene);
 658    }
 659
 660    lp_rast_destroy( setup->rast );
 661
 662    FREE( setup );
 663 }
 664
 665
 666 /**
 667  * Create a new primitive tiling engine.  Plug it into the backend of
 668  * the draw module.  Currently also creates a rasterizer to use with
 669  * it.
 670  */
 671 struct setup_context *
 672 lp_setup_create( struct pipe_screen *screen,
 673                  struct draw_context *draw )
 674 {
 675    unsigned i;
 676    struct setup_context *setup = CALLOC_STRUCT(setup_context);
 677
 678    if (!setup)
 679       return NULL;
 680
 681    lp_setup_init_vbuf(setup);
 682
 683    setup->empty_scenes = lp_scene_queue_create();
 684    if (!setup->empty_scenes)
 685       goto fail;
 686
 687    setup->rast = lp_rast_create( screen, setup->empty_scenes );
 688    if (!setup->rast)
 689       goto fail;
 690
 691    setup->vbuf = draw_vbuf_stage(draw, &setup->base);
 692    if (!setup->vbuf)
 693       goto fail;
 694
 695    draw_set_rasterize_stage(draw, setup->vbuf);
 696    draw_set_render(draw, &setup->base);
 697
 698    /* create some empty scenes */
 699    for (i = 0; i < MAX_SCENES; i++) {
 700       setup->scenes[i] = lp_scene_create();
 701       lp_scene_enqueue(setup->empty_scenes, setup->scenes[i]);
 702    }
 703
 704    setup->triangle = first_triangle;
 705    setup->line     = first_line;
 706    setup->point    = first_point;
 707
 708    setup->dirty = ~0;
 709
 710    return setup;
 711
 712 fail:
 713    if (setup->rast)
 714       lp_rast_destroy( setup->rast );
 715
 716    if (setup->vbuf)
 717       ;
 718
 719    if (setup->empty_scenes)
 720       lp_scene_queue_destroy(setup->empty_scenes);
 721
 722    FREE(setup);
 723    return NULL;
 724 }
 725