src/mesa/drivers/dri/i965/brw_draw_upload.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 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 #include <stdlib.h>
  29
  30 #include "glheader.h"
  31 #include "context.h"
  32 #include "state.h"
  33 #include "api_validate.h"
  34 #include "enums.h"
  35
  36 #include "brw_draw.h"
  37 #include "brw_defines.h"
  38 #include "brw_context.h"
  39 #include "brw_state.h"
  40 #include "brw_fallback.h"
  41
  42 #include "intel_ioctl.h"
  43 #include "intel_batchbuffer.h"
  44 #include "intel_buffer_objects.h"
  45 #include "intel_tex.h"
  46
  47 static GLuint double_types[5] = {
  48    0,
  49    BRW_SURFACEFORMAT_R64_FLOAT,
  50    BRW_SURFACEFORMAT_R64G64_FLOAT,
  51    BRW_SURFACEFORMAT_R64G64B64_FLOAT,
  52    BRW_SURFACEFORMAT_R64G64B64A64_FLOAT
  53 };
  54
  55 static GLuint float_types[5] = {
  56    0,
  57    BRW_SURFACEFORMAT_R32_FLOAT,
  58    BRW_SURFACEFORMAT_R32G32_FLOAT,
  59    BRW_SURFACEFORMAT_R32G32B32_FLOAT,
  60    BRW_SURFACEFORMAT_R32G32B32A32_FLOAT
  61 };
  62
  63 static GLuint uint_types_norm[5] = {
  64    0,
  65    BRW_SURFACEFORMAT_R32_UNORM,
  66    BRW_SURFACEFORMAT_R32G32_UNORM,
  67    BRW_SURFACEFORMAT_R32G32B32_UNORM,
  68    BRW_SURFACEFORMAT_R32G32B32A32_UNORM
  69 };
  70
  71 static GLuint uint_types_scale[5] = {
  72    0,
  73    BRW_SURFACEFORMAT_R32_USCALED,
  74    BRW_SURFACEFORMAT_R32G32_USCALED,
  75    BRW_SURFACEFORMAT_R32G32B32_USCALED,
  76    BRW_SURFACEFORMAT_R32G32B32A32_USCALED
  77 };
  78
  79 static GLuint int_types_norm[5] = {
  80    0,
  81    BRW_SURFACEFORMAT_R32_SNORM,
  82    BRW_SURFACEFORMAT_R32G32_SNORM,
  83    BRW_SURFACEFORMAT_R32G32B32_SNORM,
  84    BRW_SURFACEFORMAT_R32G32B32A32_SNORM
  85 };
  86
  87 static GLuint int_types_scale[5] = {
  88    0,
  89    BRW_SURFACEFORMAT_R32_SSCALED,
  90    BRW_SURFACEFORMAT_R32G32_SSCALED,
  91    BRW_SURFACEFORMAT_R32G32B32_SSCALED,
  92    BRW_SURFACEFORMAT_R32G32B32A32_SSCALED
  93 };
  94
  95 static GLuint ushort_types_norm[5] = {
  96    0,
  97    BRW_SURFACEFORMAT_R16_UNORM,
  98    BRW_SURFACEFORMAT_R16G16_UNORM,
  99    BRW_SURFACEFORMAT_R16G16B16_UNORM,
 100    BRW_SURFACEFORMAT_R16G16B16A16_UNORM
 101 };
 102
 103 static GLuint ushort_types_scale[5] = {
 104    0,
 105    BRW_SURFACEFORMAT_R16_USCALED,
 106    BRW_SURFACEFORMAT_R16G16_USCALED,
 107    BRW_SURFACEFORMAT_R16G16B16_USCALED,
 108    BRW_SURFACEFORMAT_R16G16B16A16_USCALED
 109 };
 110
 111 static GLuint short_types_norm[5] = {
 112    0,
 113    BRW_SURFACEFORMAT_R16_SNORM,
 114    BRW_SURFACEFORMAT_R16G16_SNORM,
 115    BRW_SURFACEFORMAT_R16G16B16_SNORM,
 116    BRW_SURFACEFORMAT_R16G16B16A16_SNORM
 117 };
 118
 119 static GLuint short_types_scale[5] = {
 120    0,
 121    BRW_SURFACEFORMAT_R16_SSCALED,
 122    BRW_SURFACEFORMAT_R16G16_SSCALED,
 123    BRW_SURFACEFORMAT_R16G16B16_SSCALED,
 124    BRW_SURFACEFORMAT_R16G16B16A16_SSCALED
 125 };
 126
 127 static GLuint ubyte_types_norm[5] = {
 128    0,
 129    BRW_SURFACEFORMAT_R8_UNORM,
 130    BRW_SURFACEFORMAT_R8G8_UNORM,
 131    BRW_SURFACEFORMAT_R8G8B8_UNORM,
 132    BRW_SURFACEFORMAT_R8G8B8A8_UNORM
 133 };
 134
 135 static GLuint ubyte_types_scale[5] = {
 136    0,
 137    BRW_SURFACEFORMAT_R8_USCALED,
 138    BRW_SURFACEFORMAT_R8G8_USCALED,
 139    BRW_SURFACEFORMAT_R8G8B8_USCALED,
 140    BRW_SURFACEFORMAT_R8G8B8A8_USCALED
 141 };
 142
 143 static GLuint byte_types_norm[5] = {
 144    0,
 145    BRW_SURFACEFORMAT_R8_SNORM,
 146    BRW_SURFACEFORMAT_R8G8_SNORM,
 147    BRW_SURFACEFORMAT_R8G8B8_SNORM,
 148    BRW_SURFACEFORMAT_R8G8B8A8_SNORM
 149 };
 150
 151 static GLuint byte_types_scale[5] = {
 152    0,
 153    BRW_SURFACEFORMAT_R8_SSCALED,
 154    BRW_SURFACEFORMAT_R8G8_SSCALED,
 155    BRW_SURFACEFORMAT_R8G8B8_SSCALED,
 156    BRW_SURFACEFORMAT_R8G8B8A8_SSCALED
 157 };
 158
 159
 160 static GLuint get_surface_type( GLenum type, GLuint size, GLboolean normalized )
 161 {
 162    if (INTEL_DEBUG & DEBUG_VERTS)
 163       _mesa_printf("type %s size %d normalized %d\n",
 164                    _mesa_lookup_enum_by_nr(type), size, normalized);
 165
 166    if (normalized) {
 167       switch (type) {
 168       case GL_DOUBLE: return double_types[size];
 169       case GL_FLOAT: return float_types[size];
 170       case GL_INT: return int_types_norm[size];
 171       case GL_SHORT: return short_types_norm[size];
 172       case GL_BYTE: return byte_types_norm[size];
 173       case GL_UNSIGNED_INT: return uint_types_norm[size];
 174       case GL_UNSIGNED_SHORT: return ushort_types_norm[size];
 175       case GL_UNSIGNED_BYTE: return ubyte_types_norm[size];
 176       default: assert(0); return 0;
 177       }
 178    }
 179    else {
 180       switch (type) {
 181       case GL_DOUBLE: return double_types[size];
 182       case GL_FLOAT: return float_types[size];
 183       case GL_INT: return int_types_scale[size];
 184       case GL_SHORT: return short_types_scale[size];
 185       case GL_BYTE: return byte_types_scale[size];
 186       case GL_UNSIGNED_INT: return uint_types_scale[size];
 187       case GL_UNSIGNED_SHORT: return ushort_types_scale[size];
 188       case GL_UNSIGNED_BYTE: return ubyte_types_scale[size];
 189       default: assert(0); return 0;
 190       }
 191    }
 192 }
 193
 194
 195 static GLuint get_size( GLenum type )
 196 {
 197    switch (type) {
 198    case GL_DOUBLE: return sizeof(GLdouble);
 199    case GL_FLOAT: return sizeof(GLfloat);
 200    case GL_INT: return sizeof(GLint);
 201    case GL_SHORT: return sizeof(GLshort);
 202    case GL_BYTE: return sizeof(GLbyte);
 203    case GL_UNSIGNED_INT: return sizeof(GLuint);
 204    case GL_UNSIGNED_SHORT: return sizeof(GLushort);
 205    case GL_UNSIGNED_BYTE: return sizeof(GLubyte);
 206    default: return 0;
 207    }
 208 }
 209
 210 static GLuint get_index_type(GLenum type)
 211 {
 212    switch (type) {
 213    case GL_UNSIGNED_BYTE:  return BRW_INDEX_BYTE;
 214    case GL_UNSIGNED_SHORT: return BRW_INDEX_WORD;
 215    case GL_UNSIGNED_INT:   return BRW_INDEX_DWORD;
 216    default: assert(0); return 0;
 217    }
 218 }
 219
 220 static void copy_strided_array( GLubyte *dest,
 221                                 const GLubyte *src,
 222                                 GLuint size,
 223                                 GLuint stride,
 224                                 GLuint count )
 225 {
 226    if (size == stride)
 227       memcpy(dest, src, count * size);
 228    else {
 229       GLuint i;
 230
 231       for (i = 0; i < count; i++) {
 232          memcpy(dest, src, size);
 233          src += stride;
 234          dest += size;
 235       }
 236    }
 237 }
 238
 239 static void wrap_buffers( struct brw_context *brw,
 240                           GLuint size )
 241 {
 242    if (size < BRW_UPLOAD_INIT_SIZE)
 243       size = BRW_UPLOAD_INIT_SIZE;
 244
 245    brw->vb.upload.offset = 0;
 246
 247    if (brw->vb.upload.bo != NULL)
 248       dri_bo_unreference(brw->vb.upload.bo);
 249    brw->vb.upload.bo = dri_bo_alloc(brw->intel.bufmgr, "temporary VBO",
 250                                     size, 1);
 251
 252    /* Set the internal VBO\ to no-backing-store.  We only use them as a
 253     * temporary within a brw_try_draw_prims while the lock is held.
 254     */
 255    /* DON'T DO THIS AS IF WE HAVE TO RE-ORG MEMORY WE NEED SOMEWHERE WITH
 256       FAKE TO PUSH THIS STUFF */
 257 //   if (!brw->intel.ttm)
 258 //      dri_bo_fake_disable_backing_store(brw->vb.upload.bo, NULL, NULL);
 259 }
 260
 261 static void get_space( struct brw_context *brw,
 262                        GLuint size,
 263                        dri_bo **bo_return,
 264                        GLuint *offset_return )
 265 {
 266    size = ALIGN(size, 64);
 267
 268    if (brw->vb.upload.bo == NULL ||
 269        brw->vb.upload.offset + size > brw->vb.upload.bo->size) {
 270       wrap_buffers(brw, size);
 271    }
 272
 273    dri_bo_reference(brw->vb.upload.bo);
 274    *bo_return = brw->vb.upload.bo;
 275    *offset_return = brw->vb.upload.offset;
 276
 277    brw->vb.upload.offset += size;
 278 }
 279
 280 static void
 281 copy_array_to_vbo_array( struct brw_context *brw,
 282                          struct brw_vertex_element *element,
 283                          GLuint dst_stride)
 284 {
 285    GLuint size = element->count * dst_stride;
 286
 287    get_space(brw, size, &element->bo, &element->offset);
 288
 289    if (element->glarray->StrideB == 0) {
 290       assert(element->count == 1);
 291       element->stride = 0;
 292    } else {
 293       element->stride = dst_stride;
 294    }
 295
 296    dri_bo_map(element->bo, GL_TRUE);
 297    copy_strided_array((unsigned char *)element->bo->virtual + element->offset,
 298                        element->glarray->Ptr,
 299                        dst_stride,
 300                        element->glarray->StrideB,
 301                        element->count);
 302    dri_bo_unmap(element->bo);
 303 }
 304
 305 int brw_prepare_vertices( struct brw_context *brw,
 306                                GLuint min_index,
 307                                GLuint max_index )
 308 {
 309    GLcontext *ctx = &brw->intel.ctx;
 310    struct intel_context *intel = intel_context(ctx);
 311    GLuint tmp = brw->vs.prog_data->inputs_read;
 312    GLuint i;
 313    const unsigned char *ptr = NULL;
 314    GLuint interleave = 0;
 315    int ret = 0;
 316
 317    struct brw_vertex_element *enabled[VERT_ATTRIB_MAX];
 318    GLuint nr_enabled = 0;
 319
 320    struct brw_vertex_element *upload[VERT_ATTRIB_MAX];
 321    GLuint nr_uploads = 0;
 322
 323    /* First build an array of pointers to ve's in vb.inputs_read
 324     */
 325    if (0)
 326       _mesa_printf("%s %d..%d\n", __FUNCTION__, min_index, max_index);
 327
 328    /* Accumulate the list of enabled arrays. */
 329    while (tmp) {
 330       GLuint i = _mesa_ffsll(tmp)-1;
 331       struct brw_vertex_element *input = &brw->vb.inputs[i];
 332
 333       tmp &= ~(1<<i);
 334       enabled[nr_enabled++] = input;
 335    }
 336
 337    /* XXX: In the rare cases where this happens we fallback all
 338     * the way to software rasterization, although a tnl fallback
 339     * would be sufficient.  I don't know of *any* real world
 340     * cases with > 17 vertex attributes enabled, so it probably
 341     * isn't an issue at this point.
 342     */
 343    if (nr_enabled >= BRW_VEP_MAX)
 344        return -1;
 345
 346    for (i = 0; i < nr_enabled; i++) {
 347       struct brw_vertex_element *input = enabled[i];
 348
 349       input->element_size = get_size(input->glarray->Type) * input->glarray->Size;
 350       input->count = input->glarray->StrideB ? max_index + 1 - min_index : 1;
 351
 352       if (input->glarray->BufferObj->Name != 0) {
 353          struct intel_buffer_object *intel_buffer =
 354             intel_buffer_object(input->glarray->BufferObj);
 355
 356          /* Named buffer object: Just reference its contents directly. */
 357          input->bo = intel_bufferobj_buffer(intel, intel_buffer,
 358                                             INTEL_READ);
 359          dri_bo_reference(input->bo);
 360          input->offset = (unsigned long)input->glarray->Ptr;
 361          input->stride = input->glarray->StrideB;
 362
 363          ret |= dri_bufmgr_check_aperture_space(input->bo);
 364       } else {
 365          /* Queue the buffer object up to be uploaded in the next pass,
 366           * when we've decided if we're doing interleaved or not.
 367           */
 368          if (i == 0) {
 369             /* Position array not properly enabled:
 370              */
 371             if (input->glarray->StrideB == 0)
 372               return -1;
 373
 374             interleave = input->glarray->StrideB;
 375             ptr = input->glarray->Ptr;
 376          }
 377          else if (interleave != input->glarray->StrideB ||
 378                   (const unsigned char *)input->glarray->Ptr - ptr < 0 ||
 379                   (const unsigned char *)input->glarray->Ptr - ptr > interleave)
 380          {
 381             interleave = 0;
 382          }
 383
 384          upload[nr_uploads++] = input;
 385
 386          /* We rebase drawing to start at element zero only when
 387           * varyings are not in vbos, which means we can end up
 388           * uploading non-varying arrays (stride != 0) when min_index
 389           * is zero.  This doesn't matter as the amount to upload is
 390           * the same for these arrays whether the draw call is rebased
 391           * or not - we just have to upload the one element.
 392           */
 393          assert(min_index == 0 || input->glarray->StrideB == 0);
 394       }
 395    }
 396
 397    /* Handle any arrays to be uploaded. */
 398    if (nr_uploads > 1 && interleave && interleave <= 256) {
 399       /* All uploads are interleaved, so upload the arrays together as
 400        * interleaved.  First, upload the contents and set up upload[0].
 401        */
 402       copy_array_to_vbo_array(brw, upload[0], interleave);
 403
 404       ret |= dri_bufmgr_check_aperture_space(upload[0]->bo);
 405       for (i = 1; i < nr_uploads; i++) {
 406          /* Then, just point upload[i] at upload[0]'s buffer. */
 407          upload[i]->stride = interleave;
 408          upload[i]->offset = upload[0]->offset +
 409             ((const unsigned char *)upload[i]->glarray->Ptr - ptr);
 410          upload[i]->bo = upload[0]->bo;
 411          dri_bo_reference(upload[i]->bo);
 412       }
 413    }
 414    else {
 415       /* Upload non-interleaved arrays */
 416       for (i = 0; i < nr_uploads; i++) {
 417           copy_array_to_vbo_array(brw, upload[i], upload[i]->element_size);
 418           if (upload[i]->bo) {
 419               ret |= dri_bufmgr_check_aperture_space(upload[i]->bo);
 420           }
 421       }
 422    }
 423
 424
 425    if (ret)
 426      return 1;
 427
 428
 429    return 0;
 430 }
 431
 432 void brw_emit_vertices( struct brw_context *brw,
 433                         GLuint min_index,
 434                         GLuint max_index )
 435 {
 436    GLcontext *ctx = &brw->intel.ctx;
 437    struct intel_context *intel = intel_context(ctx);
 438    GLuint tmp = brw->vs.prog_data->inputs_read;
 439    struct brw_vertex_element *enabled[VERT_ATTRIB_MAX];
 440    GLuint i;
 441    GLuint nr_enabled = 0;
 442
 443   /* Accumulate the list of enabled arrays. */
 444    while (tmp) {
 445       i = _mesa_ffsll(tmp)-1;
 446       struct brw_vertex_element *input = &brw->vb.inputs[i];
 447
 448       tmp &= ~(1<<i);
 449       enabled[nr_enabled++] = input;
 450    }
 451
 452
 453    /* Now emit VB and VEP state packets.
 454     *
 455     * This still defines a hardware VB for each input, even if they
 456     * are interleaved or from the same VBO.  TBD if this makes a
 457     * performance difference.
 458     */
 459    BEGIN_BATCH(1 + nr_enabled * 4, IGNORE_CLIPRECTS);
 460    OUT_BATCH((CMD_VERTEX_BUFFER << 16) |
 461              ((1 + nr_enabled * 4) - 2));
 462
 463    for (i = 0; i < nr_enabled; i++) {
 464       struct brw_vertex_element *input = enabled[i];
 465
 466       OUT_BATCH((i << BRW_VB0_INDEX_SHIFT) |
 467                 BRW_VB0_ACCESS_VERTEXDATA |
 468                 (input->stride << BRW_VB0_PITCH_SHIFT));
 469       OUT_RELOC(input->bo,
 470                 DRM_GEM_DOMAIN_I915_VERTEX, 0,
 471                 input->offset);
 472       OUT_BATCH(max_index);
 473       OUT_BATCH(0); /* Instance data step rate */
 474
 475       /* Unreference the buffer so it can get freed, now that we won't
 476        * touch it any more.
 477        */
 478       dri_bo_unreference(input->bo);
 479       input->bo = NULL;
 480    }
 481    ADVANCE_BATCH();
 482
 483    BEGIN_BATCH(1 + nr_enabled * 2, IGNORE_CLIPRECTS);
 484    OUT_BATCH((CMD_VERTEX_ELEMENT << 16) | ((1 + nr_enabled * 2) - 2));
 485    for (i = 0; i < nr_enabled; i++) {
 486       struct brw_vertex_element *input = enabled[i];
 487       uint32_t format = get_surface_type(input->glarray->Type,
 488                                          input->glarray->Size,
 489                                          input->glarray->Normalized);
 490       uint32_t comp0 = BRW_VE1_COMPONENT_STORE_SRC;
 491       uint32_t comp1 = BRW_VE1_COMPONENT_STORE_SRC;
 492       uint32_t comp2 = BRW_VE1_COMPONENT_STORE_SRC;
 493       uint32_t comp3 = BRW_VE1_COMPONENT_STORE_SRC;
 494
 495       switch (input->glarray->Size) {
 496       case 0: comp0 = BRW_VE1_COMPONENT_STORE_0;
 497       case 1: comp1 = BRW_VE1_COMPONENT_STORE_0;
 498       case 2: comp2 = BRW_VE1_COMPONENT_STORE_0;
 499       case 3: comp3 = BRW_VE1_COMPONENT_STORE_1_FLT;
 500          break;
 501       }
 502
 503       OUT_BATCH((i << BRW_VE0_INDEX_SHIFT) |
 504                 BRW_VE0_VALID |
 505                 (format << BRW_VE0_FORMAT_SHIFT) |
 506                 (0 << BRW_VE0_SRC_OFFSET_SHIFT));
 507       OUT_BATCH((comp0 << BRW_VE1_COMPONENT_0_SHIFT) |
 508                 (comp1 << BRW_VE1_COMPONENT_1_SHIFT) |
 509                 (comp2 << BRW_VE1_COMPONENT_2_SHIFT) |
 510                 (comp3 << BRW_VE1_COMPONENT_3_SHIFT) |
 511                 ((i * 4) << BRW_VE1_DST_OFFSET_SHIFT));
 512    }
 513    ADVANCE_BATCH();
 514 }
 515
 516 int brw_prepare_indices( struct brw_context *brw,
 517                          const struct _mesa_index_buffer *index_buffer,
 518                          dri_bo **bo_return,
 519                          GLuint *offset_return)
 520 {
 521    GLcontext *ctx = &brw->intel.ctx;
 522    struct intel_context *intel = &brw->intel;
 523    GLuint ib_size = get_size(index_buffer->type) * index_buffer->count;
 524    dri_bo *bo;
 525    struct gl_buffer_object *bufferobj = index_buffer->obj;
 526    GLuint offset = (GLuint)index_buffer->ptr;
 527    int ret;
 528
 529    /* Turn into a proper VBO:
 530     */
 531    if (!bufferobj->Name) {
 532
 533       /* Get new bufferobj, offset:
 534        */
 535       get_space(brw, ib_size, &bo, &offset);
 536
 537       /* Straight upload
 538        */
 539       dri_bo_subdata(bo, offset, ib_size, index_buffer->ptr);
 540    } else {
 541       /* If the index buffer isn't aligned to its element size, we have to
 542        * rebase it into a temporary.
 543        */
 544        if ((get_size(index_buffer->type) - 1) & offset) {
 545            GLubyte *map = ctx->Driver.MapBuffer(ctx,
 546                                                 GL_ELEMENT_ARRAY_BUFFER_ARB,
 547                                                 GL_DYNAMIC_DRAW_ARB,
 548                                                 bufferobj);
 549            map += offset;
 550
 551            get_space(brw, ib_size, &bo, &offset);
 552
 553            dri_bo_subdata(bo, offset, ib_size, map);
 554
 555            ctx->Driver.UnmapBuffer(ctx, GL_ELEMENT_ARRAY_BUFFER_ARB, bufferobj);
 556        } else {
 557           bo = intel_bufferobj_buffer(intel, intel_buffer_object(bufferobj),
 558                                       INTEL_READ);
 559           dri_bo_reference(bo);
 560        }
 561    }
 562
 563    *bo_return = bo;
 564    *offset_return = offset;
 565    ret = dri_bufmgr_check_aperture_space(bo);
 566    return ret;
 567 }
 568
 569 void brw_emit_indices(struct brw_context *brw,
 570                       const struct _mesa_index_buffer *index_buffer,
 571                       dri_bo *bo,
 572                       GLuint offset)
 573 {
 574    struct intel_context *intel = &brw->intel;
 575    GLuint ib_size = get_size(index_buffer->type) * index_buffer->count;
 576    /* Emit the indexbuffer packet:
 577     */
 578    {
 579       struct brw_indexbuffer ib;
 580
 581       memset(&ib, 0, sizeof(ib));
 582
 583       ib.header.bits.opcode = CMD_INDEX_BUFFER;
 584       ib.header.bits.length = sizeof(ib)/4 - 2;
 585       ib.header.bits.index_format = get_index_type(index_buffer->type);
 586       ib.header.bits.cut_index_enable = 0;
 587
 588
 589       BEGIN_BATCH(4, IGNORE_CLIPRECTS);
 590       OUT_BATCH( ib.header.dword );
 591       OUT_RELOC( bo,
 592                  DRM_GEM_DOMAIN_I915_VERTEX, 0,
 593                  offset);
 594       OUT_RELOC( bo,
 595                  DRM_GEM_DOMAIN_I915_VERTEX, 0,
 596                  offset + ib_size);
 597       OUT_BATCH( 0 );
 598       ADVANCE_BATCH();
 599
 600       dri_bo_unreference(bo);
 601    }
 602 }
 603