src/gallium/drivers/i915/i915_prim_vbuf.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  * \file
  30  * Build post-transformation, post-clipping vertex buffers and element
  31  * lists by hooking into the end of the primitive pipeline and
  32  * manipulating the vertex_id field in the vertex headers.
  33  *
  34  * XXX: work in progress
  35  *
  36  * \author José Fonseca <jrfonseca@tungstengraphics.com>
  37  * \author Keith Whitwell <keith@tungstengraphics.com>
  38  */
  39
  40
  41 #include "draw/draw_context.h"
  42 #include "draw/draw_vbuf.h"
  43 #include "util/u_debug.h"
  44 #include "util/u_inlines.h"
  45 #include "util/u_math.h"
  46 #include "util/u_memory.h"
  47 #include "util/u_fifo.h"
  48
  49 #include "i915_context.h"
  50 #include "i915_reg.h"
  51 #include "i915_batch.h"
  52 #include "i915_state.h"
  53
  54
  55 #undef VBUF_USE_FIFO
  56 #undef VBUF_MAP_BUFFER
  57
  58 /**
  59  * Primitive renderer for i915.
  60  */
  61 struct i915_vbuf_render {
  62    struct vbuf_render base;
  63
  64    struct i915_context *i915;
  65
  66    /** Vertex size in bytes */
  67    size_t vertex_size;
  68
  69    /** Software primitive */
  70    unsigned prim;
  71
  72    /** Hardware primitive */
  73    unsigned hwprim;
  74
  75    /** Genereate a vertex list */
  76    unsigned fallback;
  77
  78    /* Stuff for the vbo */
  79    struct i915_winsys_buffer *vbo;
  80    size_t vbo_size; /**< current size of allocated buffer */
  81    size_t vbo_alloc_size; /**< minimum buffer size to allocate */
  82    size_t vbo_offset;
  83    void *vbo_ptr;
  84    size_t vbo_max_used;
  85
  86 #ifndef VBUF_MAP_BUFFER
  87    size_t map_used_start;
  88    size_t map_used_end;
  89    size_t map_size;
  90 #endif
  91
  92 #ifdef VBUF_USE_FIFO
  93    /* Stuff for the pool */
  94    struct util_fifo *pool_fifo;
  95    unsigned pool_used;
  96    unsigned pool_buffer_size;
  97    boolean pool_not_used;
  98 #endif
  99 };
 100
 101
 102 /**
 103  * Basically a cast wrapper.
 104  */
 105 static INLINE struct i915_vbuf_render *
 106 i915_vbuf_render(struct vbuf_render *render)
 107 {
 108    assert(render);
 109    return (struct i915_vbuf_render *)render;
 110 }
 111
 112 static const struct vertex_info *
 113 i915_vbuf_render_get_vertex_info(struct vbuf_render *render)
 114 {
 115    struct i915_vbuf_render *i915_render = i915_vbuf_render(render);
 116    struct i915_context *i915 = i915_render->i915;
 117
 118    if (i915->dirty) {
 119       /* make sure we have up to date vertex layout */
 120       i915_update_derived(i915);
 121    }
 122
 123    return &i915->current.vertex_info;
 124 }
 125
 126 static boolean
 127 i915_vbuf_render_reserve(struct i915_vbuf_render *i915_render, size_t size)
 128 {
 129    struct i915_context *i915 = i915_render->i915;
 130
 131    if (i915_render->vbo_size < size + i915_render->vbo_offset)
 132       return FALSE;
 133
 134    if (i915->vbo_flushed)
 135       return FALSE;
 136
 137    return TRUE;
 138 }
 139
 140 static void
 141 i915_vbuf_render_new_buf(struct i915_vbuf_render *i915_render, size_t size)
 142 {
 143    struct i915_context *i915 = i915_render->i915;
 144    struct i915_winsys *iws = i915->iws;
 145
 146    if (i915_render->vbo) {
 147 #ifdef VBUF_USE_FIFO
 148       if (i915_render->pool_not_used)
 149          iws->buffer_destroy(iws, i915_render->vbo);
 150       else
 151          u_fifo_add(i915_render->pool_fifo, i915_render->vbo);
 152       i915_render->vbo = NULL;
 153 #else
 154       iws->buffer_destroy(iws, i915_render->vbo);
 155 #endif
 156    }
 157
 158    i915->vbo_flushed = 0;
 159
 160    i915_render->vbo_size = MAX2(size, i915_render->vbo_alloc_size);
 161    i915_render->vbo_offset = 0;
 162
 163 #ifndef VBUF_MAP_BUFFER
 164    if (i915_render->vbo_size > i915_render->map_size) {
 165       i915_render->map_size = i915_render->vbo_size;
 166       FREE(i915_render->vbo_ptr);
 167       i915_render->vbo_ptr = MALLOC(i915_render->map_size);
 168    }
 169 #endif
 170
 171 #ifdef VBUF_USE_FIFO
 172    if (i915_render->vbo_size != i915_render->pool_buffer_size) {
 173       i915_render->pool_not_used = TRUE;
 174       i915_render->vbo = iws->buffer_create(iws, i915_render->vbo_size, 64,
 175             I915_NEW_VERTEX);
 176    } else {
 177       i915_render->pool_not_used = FALSE;
 178
 179       if (i915_render->pool_used >= 2) {
 180          FLUSH_BATCH(NULL);
 181          i915->vbo_flushed = 0;
 182          i915_render->pool_used = 0;
 183       }
 184       u_fifo_pop(i915_render->pool_fifo, (void**)&i915_render->vbo);
 185    }
 186 #else
 187    i915_render->vbo = iws->buffer_create(iws, i915_render->vbo_size,
 188                                          64, I915_NEW_VERTEX);
 189 #endif
 190 }
 191
 192 static boolean
 193 i915_vbuf_render_allocate_vertices(struct vbuf_render *render,
 194                                    ushort vertex_size,
 195                                    ushort nr_vertices)
 196 {
 197    struct i915_vbuf_render *i915_render = i915_vbuf_render(render);
 198    struct i915_context *i915 = i915_render->i915;
 199    size_t size = (size_t)vertex_size * (size_t)nr_vertices;
 200
 201    /* FIXME: handle failure */
 202    assert(!i915->vbo);
 203
 204    if (!i915_vbuf_render_reserve(i915_render, size)) {
 205 #ifdef VBUF_USE_FIFO
 206       /* incase we flushed reset the number of pool buffers used */
 207       if (i915->vbo_flushed)
 208          i915_render->pool_used = 0;
 209 #endif
 210       i915_vbuf_render_new_buf(i915_render, size);
 211    }
 212
 213    i915_render->vertex_size = vertex_size;
 214    i915->vbo = i915_render->vbo;
 215    i915->vbo_offset = i915_render->vbo_offset;
 216    i915->dirty |= I915_NEW_VBO;
 217
 218    if (!i915_render->vbo)
 219       return FALSE;
 220    return TRUE;
 221 }
 222
 223 static void *
 224 i915_vbuf_render_map_vertices(struct vbuf_render *render)
 225 {
 226    struct i915_vbuf_render *i915_render = i915_vbuf_render(render);
 227    struct i915_context *i915 = i915_render->i915;
 228    struct i915_winsys *iws = i915->iws;
 229
 230    if (i915->vbo_flushed)
 231       debug_printf("%s bad vbo flush occured stalling on hw\n", __FUNCTION__);
 232
 233 #ifdef VBUF_MAP_BUFFER
 234    i915_render->vbo_ptr = iws->buffer_map(iws, i915_render->vbo, TRUE);
 235    return (unsigned char *)i915_render->vbo_ptr + i915_render->vbo_offset;
 236 #else
 237    (void)iws;
 238    return (unsigned char *)i915_render->vbo_ptr;
 239 #endif
 240 }
 241
 242 static void
 243 i915_vbuf_render_unmap_vertices(struct vbuf_render *render,
 244                                 ushort min_index,
 245                                 ushort max_index)
 246 {
 247    struct i915_vbuf_render *i915_render = i915_vbuf_render(render);
 248    struct i915_context *i915 = i915_render->i915;
 249    struct i915_winsys *iws = i915->iws;
 250
 251    i915_render->vbo_max_used = MAX2(i915_render->vbo_max_used, i915_render->vertex_size * (max_index + 1));
 252 #ifdef VBUF_MAP_BUFFER
 253    iws->buffer_unmap(iws, i915_render->vbo);
 254 #else
 255    i915_render->map_used_start = i915_render->vertex_size * min_index;
 256    i915_render->map_used_end = i915_render->vertex_size * (max_index + 1);
 257    iws->buffer_write(iws, i915_render->vbo,
 258                      i915_render->map_used_start + i915_render->vbo_offset,
 259                      i915_render->map_used_end - i915_render->map_used_start,
 260                      (unsigned char *)i915_render->vbo_ptr + i915_render->map_used_start);
 261
 262 #endif
 263 }
 264
 265 static boolean
 266 i915_vbuf_render_set_primitive(struct vbuf_render *render,
 267                                unsigned prim)
 268 {
 269    struct i915_vbuf_render *i915_render = i915_vbuf_render(render);
 270    i915_render->prim = prim;
 271
 272    switch(prim) {
 273    case PIPE_PRIM_POINTS:
 274       i915_render->hwprim = PRIM3D_POINTLIST;
 275       i915_render->fallback = 0;
 276       return TRUE;
 277    case PIPE_PRIM_LINES:
 278       i915_render->hwprim = PRIM3D_LINELIST;
 279       i915_render->fallback = 0;
 280       return TRUE;
 281    case PIPE_PRIM_LINE_LOOP:
 282       i915_render->hwprim = PRIM3D_LINELIST;
 283       i915_render->fallback = PIPE_PRIM_LINE_LOOP;
 284       return TRUE;
 285    case PIPE_PRIM_LINE_STRIP:
 286       i915_render->hwprim = PRIM3D_LINESTRIP;
 287       i915_render->fallback = 0;
 288       return TRUE;
 289    case PIPE_PRIM_TRIANGLES:
 290       i915_render->hwprim = PRIM3D_TRILIST;
 291       i915_render->fallback = 0;
 292       return TRUE;
 293    case PIPE_PRIM_TRIANGLE_STRIP:
 294       i915_render->hwprim = PRIM3D_TRISTRIP;
 295       i915_render->fallback = 0;
 296       return TRUE;
 297    case PIPE_PRIM_TRIANGLE_FAN:
 298       i915_render->hwprim = PRIM3D_TRIFAN;
 299       i915_render->fallback = 0;
 300       return TRUE;
 301    case PIPE_PRIM_QUADS:
 302       i915_render->hwprim = PRIM3D_TRILIST;
 303       i915_render->fallback = PIPE_PRIM_QUADS;
 304       return TRUE;
 305    case PIPE_PRIM_QUAD_STRIP:
 306       i915_render->hwprim = PRIM3D_TRILIST;
 307       i915_render->fallback = PIPE_PRIM_QUAD_STRIP;
 308       return TRUE;
 309    case PIPE_PRIM_POLYGON:
 310       i915_render->hwprim = PRIM3D_POLY;
 311       i915_render->fallback = 0;
 312       return TRUE;
 313    default:
 314       /* FIXME: Actually, can handle a lot more just fine... */
 315       return FALSE;
 316    }
 317 }
 318
 319 /**
 320  * Used for fallbacks in draw_arrays
 321  */
 322 static void
 323 draw_arrays_generate_indices(struct vbuf_render *render,
 324                              unsigned start, uint nr,
 325                              unsigned type)
 326 {
 327    struct i915_vbuf_render *i915_render = i915_vbuf_render(render);
 328    struct i915_context *i915 = i915_render->i915;
 329    unsigned i;
 330    unsigned end = start + nr;
 331    switch(type) {
 332    case 0:
 333       for (i = start; i+1 < end; i += 2)
 334          OUT_BATCH((i+0) | (i+1) << 16);
 335       if (i < end)
 336          OUT_BATCH(i);
 337       break;
 338    case PIPE_PRIM_LINE_LOOP:
 339       if (nr >= 2) {
 340          for (i = start + 1; i < end; i++)
 341             OUT_BATCH((i-0) | (i+0) << 16);
 342          OUT_BATCH((i-0) | ( start) << 16);
 343       }
 344       break;
 345    case PIPE_PRIM_QUADS:
 346       for (i = start; i + 3 < end; i += 4) {
 347          OUT_BATCH((i+0) | (i+1) << 16);
 348          OUT_BATCH((i+3) | (i+1) << 16);
 349          OUT_BATCH((i+2) | (i+3) << 16);
 350       }
 351       break;
 352    case PIPE_PRIM_QUAD_STRIP:
 353       for (i = start; i + 3 < end; i += 2) {
 354          OUT_BATCH((i+0) | (i+1) << 16);
 355          OUT_BATCH((i+3) | (i+2) << 16);
 356          OUT_BATCH((i+0) | (i+3) << 16);
 357       }
 358       break;
 359    default:
 360       assert(0);
 361    }
 362 }
 363
 364 static unsigned
 365 draw_arrays_calc_nr_indices(uint nr, unsigned type)
 366 {
 367    switch (type) {
 368    case 0:
 369       return nr;
 370    case PIPE_PRIM_LINE_LOOP:
 371       if (nr >= 2)
 372          return nr * 2;
 373       else
 374          return 0;
 375    case PIPE_PRIM_QUADS:
 376       return (nr / 4) * 6;
 377    case PIPE_PRIM_QUAD_STRIP:
 378       return ((nr - 2) / 2) * 6;
 379    default:
 380       assert(0);
 381       return 0;
 382    }
 383 }
 384
 385 static void
 386 draw_arrays_fallback(struct vbuf_render *render,
 387                      unsigned start,
 388                      uint nr)
 389 {
 390    struct i915_vbuf_render *i915_render = i915_vbuf_render(render);
 391    struct i915_context *i915 = i915_render->i915;
 392    unsigned nr_indices;
 393
 394    if (i915->dirty)
 395       i915_update_derived(i915);
 396
 397    if (i915->hardware_dirty)
 398       i915_emit_hardware_state(i915);
 399
 400    nr_indices = draw_arrays_calc_nr_indices(nr, i915_render->fallback);
 401    if (!nr_indices)
 402       return;
 403
 404    if (!BEGIN_BATCH(1 + (nr_indices + 1)/2, 1)) {
 405       FLUSH_BATCH(NULL);
 406
 407       /* Make sure state is re-emitted after a flush:
 408        */
 409       i915_update_derived(i915);
 410       i915_emit_hardware_state(i915);
 411       i915->vbo_flushed = 1;
 412
 413       if (!BEGIN_BATCH(1 + (nr_indices + 1)/2, 1)) {
 414          assert(0);
 415          goto out;
 416       }
 417    }
 418    OUT_BATCH(_3DPRIMITIVE |
 419              PRIM_INDIRECT |
 420              i915_render->hwprim |
 421              PRIM_INDIRECT_ELTS |
 422              nr_indices);
 423
 424    draw_arrays_generate_indices(render, start, nr, i915_render->fallback);
 425
 426 out:
 427    return;
 428 }
 429
 430 static void
 431 i915_vbuf_render_draw_arrays(struct vbuf_render *render,
 432                              unsigned start,
 433                              uint nr)
 434 {
 435    struct i915_vbuf_render *i915_render = i915_vbuf_render(render);
 436    struct i915_context *i915 = i915_render->i915;
 437
 438    if (i915_render->fallback) {
 439       draw_arrays_fallback(render, start, nr);
 440       return;
 441    }
 442
 443    if (i915->dirty)
 444       i915_update_derived(i915);
 445
 446    if (i915->hardware_dirty)
 447       i915_emit_hardware_state(i915);
 448
 449    if (!BEGIN_BATCH(2, 0)) {
 450       FLUSH_BATCH(NULL);
 451
 452       /* Make sure state is re-emitted after a flush:
 453        */
 454       i915_update_derived(i915);
 455       i915_emit_hardware_state(i915);
 456       i915->vbo_flushed = 1;
 457
 458       if (!BEGIN_BATCH(2, 0)) {
 459          assert(0);
 460          goto out;
 461       }
 462    }
 463
 464    OUT_BATCH(_3DPRIMITIVE |
 465              PRIM_INDIRECT |
 466              PRIM_INDIRECT_SEQUENTIAL |
 467              i915_render->hwprim |
 468              nr);
 469    OUT_BATCH(start); /* Beginning vertex index */
 470
 471 out:
 472    return;
 473 }
 474
 475 /**
 476  * Used for normal and fallback emitting of indices
 477  * If type is zero normal operation assumed.
 478  */
 479 static void
 480 draw_generate_indices(struct vbuf_render *render,
 481                       const ushort *indices,
 482                       uint nr_indices,
 483                       unsigned type)
 484 {
 485    struct i915_vbuf_render *i915_render = i915_vbuf_render(render);
 486    struct i915_context *i915 = i915_render->i915;
 487    unsigned i;
 488
 489    switch(type) {
 490    case 0:
 491       for (i = 0; i + 1 < nr_indices; i += 2) {
 492          OUT_BATCH(indices[i] | indices[i+1] << 16);
 493       }
 494       if (i < nr_indices) {
 495          OUT_BATCH(indices[i]);
 496       }
 497       break;
 498    case PIPE_PRIM_LINE_LOOP:
 499       if (nr_indices >= 2) {
 500          for (i = 1; i < nr_indices; i++)
 501             OUT_BATCH(indices[i-1] | indices[i] << 16);
 502          OUT_BATCH(indices[i-1] | indices[0] << 16);
 503       }
 504       break;
 505    case PIPE_PRIM_QUADS:
 506       for (i = 0; i + 3 < nr_indices; i += 4) {
 507          OUT_BATCH(indices[i+0] | indices[i+1] << 16);
 508          OUT_BATCH(indices[i+3] | indices[i+1] << 16);
 509          OUT_BATCH(indices[i+2] | indices[i+3] << 16);
 510       }
 511       break;
 512    case PIPE_PRIM_QUAD_STRIP:
 513       for (i = 0; i + 3 < nr_indices; i += 2) {
 514          OUT_BATCH(indices[i+0] | indices[i+1] << 16);
 515          OUT_BATCH(indices[i+3] | indices[i+2] << 16);
 516          OUT_BATCH(indices[i+0] | indices[i+3] << 16);
 517       }
 518       break;
 519    default:
 520       assert(0);
 521       break;
 522    }
 523 }
 524
 525 static unsigned
 526 draw_calc_nr_indices(uint nr_indices, unsigned type)
 527 {
 528    switch (type) {
 529    case 0:
 530       return nr_indices;
 531    case PIPE_PRIM_LINE_LOOP:
 532       if (nr_indices >= 2)
 533          return nr_indices * 2;
 534       else
 535          return 0;
 536    case PIPE_PRIM_QUADS:
 537       return (nr_indices / 4) * 6;
 538    case PIPE_PRIM_QUAD_STRIP:
 539       return ((nr_indices - 2) / 2) * 6;
 540    default:
 541       assert(0);
 542       return 0;
 543    }
 544 }
 545
 546 static void
 547 i915_vbuf_render_draw_elements(struct vbuf_render *render,
 548                                const ushort *indices,
 549                                uint nr_indices)
 550 {
 551    struct i915_vbuf_render *i915_render = i915_vbuf_render(render);
 552    struct i915_context *i915 = i915_render->i915;
 553    unsigned save_nr_indices;
 554
 555    save_nr_indices = nr_indices;
 556
 557    nr_indices = draw_calc_nr_indices(nr_indices, i915_render->fallback);
 558    if (!nr_indices)
 559       return;
 560
 561    if (i915->dirty)
 562       i915_update_derived(i915);
 563
 564    if (i915->hardware_dirty)
 565       i915_emit_hardware_state(i915);
 566
 567    if (!BEGIN_BATCH(1 + (nr_indices + 1)/2, 1)) {
 568       FLUSH_BATCH(NULL);
 569
 570       /* Make sure state is re-emitted after a flush:
 571        */
 572       i915_update_derived(i915);
 573       i915_emit_hardware_state(i915);
 574       i915->vbo_flushed = 1;
 575
 576       if (!BEGIN_BATCH(1 + (nr_indices + 1)/2, 1)) {
 577          assert(0);
 578          goto out;
 579       }
 580    }
 581
 582    OUT_BATCH(_3DPRIMITIVE |
 583              PRIM_INDIRECT |
 584              i915_render->hwprim |
 585              PRIM_INDIRECT_ELTS |
 586              nr_indices);
 587    draw_generate_indices(render,
 588                          indices,
 589                          save_nr_indices,
 590                          i915_render->fallback);
 591
 592 out:
 593    return;
 594 }
 595
 596 static void
 597 i915_vbuf_render_release_vertices(struct vbuf_render *render)
 598 {
 599    struct i915_vbuf_render *i915_render = i915_vbuf_render(render);
 600    struct i915_context *i915 = i915_render->i915;
 601
 602    assert(i915->vbo);
 603
 604    i915_render->vbo_offset += i915_render->vbo_max_used;
 605    i915_render->vbo_max_used = 0;
 606    i915->vbo = NULL;
 607    i915->dirty |= I915_NEW_VBO;
 608 }
 609
 610 static void
 611 i915_vbuf_render_destroy(struct vbuf_render *render)
 612 {
 613    struct i915_vbuf_render *i915_render = i915_vbuf_render(render);
 614    FREE(i915_render);
 615 }
 616
 617 /**
 618  * Create a new primitive render.
 619  */
 620 static struct vbuf_render *
 621 i915_vbuf_render_create(struct i915_context *i915)
 622 {
 623    struct i915_vbuf_render *i915_render = CALLOC_STRUCT(i915_vbuf_render);
 624    struct i915_winsys *iws = i915->iws;
 625    int i;
 626
 627    i915_render->i915 = i915;
 628
 629    i915_render->base.max_vertex_buffer_bytes = 16*4096;
 630
 631    /* NOTE: it must be such that state and vertices indices fit in a single
 632     * batch buffer.
 633     */
 634    i915_render->base.max_indices = 16*1024;
 635
 636    i915_render->base.get_vertex_info = i915_vbuf_render_get_vertex_info;
 637    i915_render->base.allocate_vertices = i915_vbuf_render_allocate_vertices;
 638    i915_render->base.map_vertices = i915_vbuf_render_map_vertices;
 639    i915_render->base.unmap_vertices = i915_vbuf_render_unmap_vertices;
 640    i915_render->base.set_primitive = i915_vbuf_render_set_primitive;
 641    i915_render->base.draw_elements = i915_vbuf_render_draw_elements;
 642    i915_render->base.draw_arrays = i915_vbuf_render_draw_arrays;
 643    i915_render->base.release_vertices = i915_vbuf_render_release_vertices;
 644    i915_render->base.destroy = i915_vbuf_render_destroy;
 645
 646 #ifndef VBUF_MAP_BUFFER
 647    i915_render->map_size = 0;
 648    i915_render->map_used_start = 0;
 649    i915_render->map_used_end = 0;
 650 #endif
 651
 652    i915_render->vbo = NULL;
 653    i915_render->vbo_ptr = NULL;
 654    i915_render->vbo_size = 0;
 655    i915_render->vbo_offset = 0;
 656    i915_render->vbo_alloc_size = i915_render->base.max_vertex_buffer_bytes * 4;
 657
 658 #ifdef VBUF_USE_POOL
 659    i915_render->pool_used = FALSE;
 660    i915_render->pool_buffer_size = i915_render->vbo_alloc_size;
 661    i915_render->pool_fifo = u_fifo_create(6);
 662    for (i = 0; i < 6; i++)
 663       u_fifo_add(i915_render->pool_fifo,
 664                  iws->buffer_create(iws, i915_render->pool_buffer_size, 64,
 665                                     I915_NEW_VERTEX));
 666 #else
 667    (void)i;
 668    (void)iws;
 669 #endif
 670
 671    return &i915_render->base;
 672 }
 673
 674 /**
 675  * Create a new primitive vbuf/render stage.
 676  */
 677 struct draw_stage *i915_draw_vbuf_stage(struct i915_context *i915)
 678 {
 679    struct vbuf_render *render;
 680    struct draw_stage *stage;
 681
 682    render = i915_vbuf_render_create(i915);
 683    if(!render)
 684       return NULL;
 685
 686    stage = draw_vbuf_stage(i915->draw, render);
 687    if(!stage) {
 688       render->destroy(render);
 689       return NULL;
 690    }
 691    /** TODO JB: this shouldn't be here */
 692    draw_set_render(i915->draw, render);
 693
 694    return stage;
 695 }