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
  46
  47 struct brw_array_state {
  48    union header_union header;
  49
  50    struct {
  51       union {
  52          struct {
  53             GLuint pitch:11;
  54             GLuint pad:15;
  55             GLuint access_type:1;
  56             GLuint vb_index:5;
  57          } bits;
  58          GLuint dword;
  59       } vb0;
  60
  61       dri_bo *buffer;
  62       GLuint offset;
  63
  64       GLuint max_index;
  65       GLuint instance_data_step_rate;
  66
  67    } vb[BRW_VBP_MAX];
  68 };
  69
  70
  71 static dri_bo *array_buffer( struct intel_context *intel,
  72                              const struct gl_client_array *array )
  73 {
  74    return intel_bufferobj_buffer(intel, intel_buffer_object(array->BufferObj),
  75                                  INTEL_WRITE_PART);
  76 }
  77
  78 static GLuint double_types[5] = {
  79    0,
  80    BRW_SURFACEFORMAT_R64_FLOAT,
  81    BRW_SURFACEFORMAT_R64G64_FLOAT,
  82    BRW_SURFACEFORMAT_R64G64B64_FLOAT,
  83    BRW_SURFACEFORMAT_R64G64B64A64_FLOAT
  84 };
  85
  86 static GLuint float_types[5] = {
  87    0,
  88    BRW_SURFACEFORMAT_R32_FLOAT,
  89    BRW_SURFACEFORMAT_R32G32_FLOAT,
  90    BRW_SURFACEFORMAT_R32G32B32_FLOAT,
  91    BRW_SURFACEFORMAT_R32G32B32A32_FLOAT
  92 };
  93
  94 static GLuint uint_types_norm[5] = {
  95    0,
  96    BRW_SURFACEFORMAT_R32_UNORM,
  97    BRW_SURFACEFORMAT_R32G32_UNORM,
  98    BRW_SURFACEFORMAT_R32G32B32_UNORM,
  99    BRW_SURFACEFORMAT_R32G32B32A32_UNORM
 100 };
 101
 102 static GLuint uint_types_scale[5] = {
 103    0,
 104    BRW_SURFACEFORMAT_R32_USCALED,
 105    BRW_SURFACEFORMAT_R32G32_USCALED,
 106    BRW_SURFACEFORMAT_R32G32B32_USCALED,
 107    BRW_SURFACEFORMAT_R32G32B32A32_USCALED
 108 };
 109
 110 static GLuint int_types_norm[5] = {
 111    0,
 112    BRW_SURFACEFORMAT_R32_SNORM,
 113    BRW_SURFACEFORMAT_R32G32_SNORM,
 114    BRW_SURFACEFORMAT_R32G32B32_SNORM,
 115    BRW_SURFACEFORMAT_R32G32B32A32_SNORM
 116 };
 117
 118 static GLuint int_types_scale[5] = {
 119    0,
 120    BRW_SURFACEFORMAT_R32_SSCALED,
 121    BRW_SURFACEFORMAT_R32G32_SSCALED,
 122    BRW_SURFACEFORMAT_R32G32B32_SSCALED,
 123    BRW_SURFACEFORMAT_R32G32B32A32_SSCALED
 124 };
 125
 126 static GLuint ushort_types_norm[5] = {
 127    0,
 128    BRW_SURFACEFORMAT_R16_UNORM,
 129    BRW_SURFACEFORMAT_R16G16_UNORM,
 130    BRW_SURFACEFORMAT_R16G16B16_UNORM,
 131    BRW_SURFACEFORMAT_R16G16B16A16_UNORM
 132 };
 133
 134 static GLuint ushort_types_scale[5] = {
 135    0,
 136    BRW_SURFACEFORMAT_R16_USCALED,
 137    BRW_SURFACEFORMAT_R16G16_USCALED,
 138    BRW_SURFACEFORMAT_R16G16B16_USCALED,
 139    BRW_SURFACEFORMAT_R16G16B16A16_USCALED
 140 };
 141
 142 static GLuint short_types_norm[5] = {
 143    0,
 144    BRW_SURFACEFORMAT_R16_SNORM,
 145    BRW_SURFACEFORMAT_R16G16_SNORM,
 146    BRW_SURFACEFORMAT_R16G16B16_SNORM,
 147    BRW_SURFACEFORMAT_R16G16B16A16_SNORM
 148 };
 149
 150 static GLuint short_types_scale[5] = {
 151    0,
 152    BRW_SURFACEFORMAT_R16_SSCALED,
 153    BRW_SURFACEFORMAT_R16G16_SSCALED,
 154    BRW_SURFACEFORMAT_R16G16B16_SSCALED,
 155    BRW_SURFACEFORMAT_R16G16B16A16_SSCALED
 156 };
 157
 158 static GLuint ubyte_types_norm[5] = {
 159    0,
 160    BRW_SURFACEFORMAT_R8_UNORM,
 161    BRW_SURFACEFORMAT_R8G8_UNORM,
 162    BRW_SURFACEFORMAT_R8G8B8_UNORM,
 163    BRW_SURFACEFORMAT_R8G8B8A8_UNORM
 164 };
 165
 166 static GLuint ubyte_types_scale[5] = {
 167    0,
 168    BRW_SURFACEFORMAT_R8_USCALED,
 169    BRW_SURFACEFORMAT_R8G8_USCALED,
 170    BRW_SURFACEFORMAT_R8G8B8_USCALED,
 171    BRW_SURFACEFORMAT_R8G8B8A8_USCALED
 172 };
 173
 174 static GLuint byte_types_norm[5] = {
 175    0,
 176    BRW_SURFACEFORMAT_R8_SNORM,
 177    BRW_SURFACEFORMAT_R8G8_SNORM,
 178    BRW_SURFACEFORMAT_R8G8B8_SNORM,
 179    BRW_SURFACEFORMAT_R8G8B8A8_SNORM
 180 };
 181
 182 static GLuint byte_types_scale[5] = {
 183    0,
 184    BRW_SURFACEFORMAT_R8_SSCALED,
 185    BRW_SURFACEFORMAT_R8G8_SSCALED,
 186    BRW_SURFACEFORMAT_R8G8B8_SSCALED,
 187    BRW_SURFACEFORMAT_R8G8B8A8_SSCALED
 188 };
 189
 190
 191 static GLuint get_surface_type( GLenum type, GLuint size, GLboolean normalized )
 192 {
 193    if (INTEL_DEBUG & DEBUG_VERTS)
 194       _mesa_printf("type %s size %d normalized %d\n",
 195                    _mesa_lookup_enum_by_nr(type), size, normalized);
 196
 197    if (normalized) {
 198       switch (type) {
 199       case GL_DOUBLE: return double_types[size];
 200       case GL_FLOAT: return float_types[size];
 201       case GL_INT: return int_types_norm[size];
 202       case GL_SHORT: return short_types_norm[size];
 203       case GL_BYTE: return byte_types_norm[size];
 204       case GL_UNSIGNED_INT: return uint_types_norm[size];
 205       case GL_UNSIGNED_SHORT: return ushort_types_norm[size];
 206       case GL_UNSIGNED_BYTE: return ubyte_types_norm[size];
 207       default: assert(0); return 0;
 208       }
 209    }
 210    else {
 211       switch (type) {
 212       case GL_DOUBLE: return double_types[size];
 213       case GL_FLOAT: return float_types[size];
 214       case GL_INT: return int_types_scale[size];
 215       case GL_SHORT: return short_types_scale[size];
 216       case GL_BYTE: return byte_types_scale[size];
 217       case GL_UNSIGNED_INT: return uint_types_scale[size];
 218       case GL_UNSIGNED_SHORT: return ushort_types_scale[size];
 219       case GL_UNSIGNED_BYTE: return ubyte_types_scale[size];
 220       default: assert(0); return 0;
 221       }
 222    }
 223 }
 224
 225
 226 static GLuint get_size( GLenum type )
 227 {
 228    switch (type) {
 229    case GL_DOUBLE: return sizeof(GLdouble);
 230    case GL_FLOAT: return sizeof(GLfloat);
 231    case GL_INT: return sizeof(GLint);
 232    case GL_SHORT: return sizeof(GLshort);
 233    case GL_BYTE: return sizeof(GLbyte);
 234    case GL_UNSIGNED_INT: return sizeof(GLuint);
 235    case GL_UNSIGNED_SHORT: return sizeof(GLushort);
 236    case GL_UNSIGNED_BYTE: return sizeof(GLubyte);
 237    default: return 0;
 238    }
 239 }
 240
 241 static GLuint get_index_type(GLenum type)
 242 {
 243    switch (type) {
 244    case GL_UNSIGNED_BYTE:  return BRW_INDEX_BYTE;
 245    case GL_UNSIGNED_SHORT: return BRW_INDEX_WORD;
 246    case GL_UNSIGNED_INT:   return BRW_INDEX_DWORD;
 247    default: assert(0); return 0;
 248    }
 249 }
 250
 251 static void copy_strided_array( GLubyte *dest,
 252                                 const GLubyte *src,
 253                                 GLuint size,
 254                                 GLuint stride,
 255                                 GLuint count )
 256 {
 257    if (size == stride)
 258       memcpy(dest, src, count * size);
 259    else {
 260       GLuint i,j;
 261
 262       for (i = 0; i < count; i++) {
 263          for (j = 0; j < size; j++)
 264             *dest++ = *src++;
 265          src += (stride - size);
 266       }
 267    }
 268 }
 269
 270 static void wrap_buffers( struct brw_context *brw,
 271                           GLuint size )
 272 {
 273    GLcontext *ctx = &brw->intel.ctx;
 274
 275    if (size < BRW_UPLOAD_INIT_SIZE)
 276       size = BRW_UPLOAD_INIT_SIZE;
 277
 278    brw->vb.upload.buf++;
 279    brw->vb.upload.buf %= BRW_NR_UPLOAD_BUFS;
 280    brw->vb.upload.offset = 0;
 281
 282    ctx->Driver.BufferData(ctx,
 283                           GL_ARRAY_BUFFER_ARB,
 284                           size,
 285                           NULL,
 286                           GL_DYNAMIC_DRAW_ARB,
 287                           brw->vb.upload.vbo[brw->vb.upload.buf]);
 288 }
 289
 290 static void get_space( struct brw_context *brw,
 291                        GLuint size,
 292                        struct gl_buffer_object **vbo_return,
 293                        GLuint *offset_return )
 294 {
 295    size = ALIGN(size, 64);
 296
 297    if (brw->vb.upload.offset + size > BRW_UPLOAD_INIT_SIZE)
 298       wrap_buffers(brw, size);
 299
 300    *vbo_return = brw->vb.upload.vbo[brw->vb.upload.buf];
 301    *offset_return = brw->vb.upload.offset;
 302
 303    brw->vb.upload.offset += size;
 304 }
 305
 306
 307
 308 static struct gl_client_array *
 309 copy_array_to_vbo_array( struct brw_context *brw,
 310                          GLuint i,
 311                          const struct gl_client_array *array,
 312                          GLuint element_size,
 313                          GLuint count)
 314 {
 315    GLcontext *ctx = &brw->intel.ctx;
 316    struct gl_client_array *vbo_array = &brw->vb.vbo_array[i];
 317    GLuint size = count * element_size;
 318    struct gl_buffer_object *vbo;
 319    GLuint offset;
 320    GLuint new_stride;
 321
 322    get_space(brw, size, &vbo, &offset);
 323
 324    if (array->StrideB == 0) {
 325       assert(count == 1);
 326       new_stride = 0;
 327    }
 328    else
 329       new_stride = element_size;
 330
 331    vbo_array->Size = array->Size;
 332    vbo_array->Type = array->Type;
 333    vbo_array->Stride = new_stride;
 334    vbo_array->StrideB = new_stride;
 335    vbo_array->Ptr = (const void *)offset;
 336    vbo_array->Enabled = 1;
 337    vbo_array->Normalized = array->Normalized;
 338    vbo_array->_MaxElement = array->_MaxElement; /* ? */
 339    vbo_array->BufferObj = vbo;
 340
 341    {
 342       GLubyte *map = ctx->Driver.MapBuffer(ctx,
 343                                            GL_ARRAY_BUFFER_ARB,
 344                                            GL_DYNAMIC_DRAW_ARB,
 345                                            vbo);
 346
 347       map += offset;
 348
 349       copy_strided_array( map,
 350                           array->Ptr,
 351                           element_size,
 352                           array->StrideB,
 353                           count);
 354
 355       ctx->Driver.UnmapBuffer(ctx, GL_ARRAY_BUFFER_ARB, vbo_array->BufferObj);
 356    }
 357
 358    return vbo_array;
 359 }
 360
 361
 362
 363 static struct gl_client_array *
 364 interleaved_vbo_array( struct brw_context *brw,
 365                        GLuint i,
 366                        const struct gl_client_array *uploaded_array,
 367                        const struct gl_client_array *array,
 368                        const char *ptr)
 369 {
 370    struct gl_client_array *vbo_array = &brw->vb.vbo_array[i];
 371
 372    vbo_array->Size = array->Size;
 373    vbo_array->Type = array->Type;
 374    vbo_array->Stride = array->Stride;
 375    vbo_array->StrideB = array->StrideB;
 376    vbo_array->Ptr = (const void *)((const char *)uploaded_array->Ptr +
 377                                    ((const char *)array->Ptr - ptr));
 378    vbo_array->Enabled = 1;
 379    vbo_array->Normalized = array->Normalized;
 380    vbo_array->_MaxElement = array->_MaxElement;
 381    vbo_array->BufferObj = uploaded_array->BufferObj;
 382
 383    return vbo_array;
 384 }
 385
 386
 387 GLboolean brw_upload_vertices( struct brw_context *brw,
 388                                GLuint min_index,
 389                                GLuint max_index )
 390 {
 391    GLcontext *ctx = &brw->intel.ctx;
 392    struct intel_context *intel = intel_context(ctx);
 393    GLuint tmp = brw->vs.prog_data->inputs_read;
 394    struct brw_vertex_element_packet vep;
 395    struct brw_array_state vbp;
 396    GLuint i;
 397    const void *ptr = NULL;
 398    GLuint interleave = 0;
 399
 400    struct brw_vertex_element *enabled[VERT_ATTRIB_MAX];
 401    GLuint nr_enabled = 0;
 402
 403    struct brw_vertex_element *upload[VERT_ATTRIB_MAX];
 404    GLuint nr_uploads = 0;
 405
 406
 407    memset(&vbp, 0, sizeof(vbp));
 408    memset(&vep, 0, sizeof(vep));
 409
 410    /* First build an array of pointers to ve's in vb.inputs_read
 411     */
 412    if (0)
 413       _mesa_printf("%s %d..%d\n", __FUNCTION__, min_index, max_index);
 414
 415    while (tmp) {
 416       GLuint i = _mesa_ffsll(tmp)-1;
 417       struct brw_vertex_element *input = &brw->vb.inputs[i];
 418
 419       tmp &= ~(1<<i);
 420       enabled[nr_enabled++] = input;
 421
 422       input->index = i;
 423       input->element_size = get_size(input->glarray->Type) * input->glarray->Size;
 424       input->count = input->glarray->StrideB ? max_index + 1 - min_index : 1;
 425
 426       if (!input->glarray->BufferObj->Name) {
 427          if (i == 0) {
 428             /* Position array not properly enabled:
 429              */
 430             if (input->glarray->StrideB == 0)
 431                return GL_FALSE;
 432
 433             interleave = input->glarray->StrideB;
 434             ptr = input->glarray->Ptr;
 435          }
 436          else if (interleave != input->glarray->StrideB ||
 437                   (const char *)input->glarray->Ptr - (const char *)ptr < 0 ||
 438                   (const char *)input->glarray->Ptr - (const char *)ptr > interleave) {
 439             interleave = 0;
 440          }
 441
 442          upload[nr_uploads++] = input;
 443
 444          /* We rebase drawing to start at element zero only when
 445           * varyings are not in vbos, which means we can end up
 446           * uploading non-varying arrays (stride != 0) when min_index
 447           * is zero.  This doesn't matter as the amount to upload is
 448           * the same for these arrays whether the draw call is rebased
 449           * or not - we just have to upload the one element.
 450           */
 451          assert(min_index == 0 || input->glarray->StrideB == 0);
 452       }
 453    }
 454
 455    /* Upload interleaved arrays if all uploads are interleaved
 456     */
 457    if (nr_uploads > 1 &&
 458        interleave &&
 459        interleave <= 256) {
 460       struct brw_vertex_element *input0 = upload[0];
 461
 462       input0->glarray = copy_array_to_vbo_array(brw, 0,
 463                                                 input0->glarray,
 464                                                 interleave,
 465                                                 input0->count);
 466
 467       for (i = 1; i < nr_uploads; i++) {
 468          upload[i]->glarray = interleaved_vbo_array(brw,
 469                                                     i,
 470                                                     input0->glarray,
 471                                                     upload[i]->glarray,
 472                                                     ptr);
 473       }
 474    }
 475    else {
 476       for (i = 0; i < nr_uploads; i++) {
 477          struct brw_vertex_element *input = upload[i];
 478
 479          input->glarray = copy_array_to_vbo_array(brw, i,
 480                                                   input->glarray,
 481                                                   input->element_size,
 482                                                   input->count);
 483
 484       }
 485    }
 486
 487    /* XXX: In the rare cases where this happens we fallback all
 488     * the way to software rasterization, although a tnl fallback
 489     * would be sufficient.  I don't know of *any* real world
 490     * cases with > 17 vertex attributes enabled, so it probably
 491     * isn't an issue at this point.
 492     */
 493    if (nr_enabled >= BRW_VEP_MAX)
 494          return GL_FALSE;
 495
 496    /* This still defines a hardware VB for each input, even if they
 497     * are interleaved or from the same VBO.  TBD if this makes a
 498     * performance difference.
 499     */
 500    for (i = 0; i < nr_enabled; i++) {
 501       struct brw_vertex_element *input = enabled[i];
 502
 503       input->vep = &vep.ve[i];
 504       input->vep->ve0.src_format = get_surface_type(input->glarray->Type,
 505                                                     input->glarray->Size,
 506                                                     input->glarray->Normalized);
 507       input->vep->ve0.valid = 1;
 508       input->vep->ve1.dst_offset = (i) * 4;
 509       input->vep->ve1.vfcomponent3 = BRW_VFCOMPONENT_STORE_SRC;
 510       input->vep->ve1.vfcomponent2 = BRW_VFCOMPONENT_STORE_SRC;
 511       input->vep->ve1.vfcomponent1 = BRW_VFCOMPONENT_STORE_SRC;
 512       input->vep->ve1.vfcomponent0 = BRW_VFCOMPONENT_STORE_SRC;
 513
 514       switch (input->glarray->Size) {
 515       case 0: input->vep->ve1.vfcomponent0 = BRW_VFCOMPONENT_STORE_0;
 516       case 1: input->vep->ve1.vfcomponent1 = BRW_VFCOMPONENT_STORE_0;
 517       case 2: input->vep->ve1.vfcomponent2 = BRW_VFCOMPONENT_STORE_0;
 518       case 3: input->vep->ve1.vfcomponent3 = BRW_VFCOMPONENT_STORE_1_FLT;
 519          break;
 520       }
 521
 522       input->vep->ve0.vertex_buffer_index = i;
 523       input->vep->ve0.src_offset = 0;
 524
 525       vbp.vb[i].vb0.bits.pitch = input->glarray->StrideB;
 526       vbp.vb[i].vb0.bits.pad = 0;
 527       vbp.vb[i].vb0.bits.access_type = BRW_VERTEXBUFFER_ACCESS_VERTEXDATA;
 528       vbp.vb[i].vb0.bits.vb_index = i;
 529       vbp.vb[i].offset = (GLuint)input->glarray->Ptr;
 530       vbp.vb[i].buffer = array_buffer(intel, input->glarray);
 531       vbp.vb[i].max_index = max_index;
 532    }
 533
 534
 535
 536    /* Now emit VB and VEP state packets:
 537     */
 538    vbp.header.bits.length = (1 + nr_enabled * 4) - 2;
 539    vbp.header.bits.opcode = CMD_VERTEX_BUFFER;
 540
 541    BEGIN_BATCH(vbp.header.bits.length+2, 0);
 542    OUT_BATCH( vbp.header.dword );
 543
 544    for (i = 0; i < nr_enabled; i++) {
 545       OUT_BATCH( vbp.vb[i].vb0.dword );
 546       OUT_RELOC( vbp.vb[i].buffer, DRM_BO_FLAG_MEM_TT | DRM_BO_FLAG_READ,
 547                  vbp.vb[i].offset);
 548       OUT_BATCH( vbp.vb[i].max_index );
 549       OUT_BATCH( vbp.vb[i].instance_data_step_rate );
 550    }
 551    ADVANCE_BATCH();
 552
 553    vep.header.length = (1 + nr_enabled * sizeof(vep.ve[0])/4) - 2;
 554    vep.header.opcode = CMD_VERTEX_ELEMENT;
 555    brw_cached_batch_struct(brw, &vep, 4 + nr_enabled * sizeof(vep.ve[0]));
 556
 557    return GL_TRUE;
 558 }
 559
 560 void brw_upload_indices( struct brw_context *brw,
 561                          const struct _mesa_index_buffer *index_buffer )
 562 {
 563    GLcontext *ctx = &brw->intel.ctx;
 564    struct intel_context *intel = &brw->intel;
 565    GLuint ib_size = get_size(index_buffer->type) * index_buffer->count;
 566    struct gl_buffer_object *bufferobj = index_buffer->obj;
 567    GLuint offset = (GLuint)index_buffer->ptr;
 568
 569    /* Turn into a proper VBO:
 570     */
 571    if (!bufferobj->Name) {
 572
 573       /* Get new bufferobj, offset:
 574        */
 575       get_space(brw, ib_size, &bufferobj, &offset);
 576
 577       /* Straight upload
 578        */
 579       ctx->Driver.BufferSubData( ctx,
 580                                  GL_ELEMENT_ARRAY_BUFFER_ARB,
 581                                  offset,
 582                                  ib_size,
 583                                  index_buffer->ptr,
 584                                  bufferobj);
 585    } else {
 586        if (((1 << get_index_type(index_buffer->type)) - 1) & offset) {
 587            struct gl_buffer_object *vbo;
 588            GLuint voffset;
 589            GLubyte *map = ctx->Driver.MapBuffer(ctx,
 590                                                 GL_ELEMENT_ARRAY_BUFFER_ARB,
 591                                                 GL_DYNAMIC_DRAW_ARB,
 592                                                 bufferobj);
 593            map += offset;
 594            get_space(brw, ib_size, &vbo, &voffset);
 595
 596            ctx->Driver.BufferSubData(ctx,
 597                                      GL_ELEMENT_ARRAY_BUFFER_ARB,
 598                                      voffset,
 599                                      ib_size,
 600                                      map,
 601                                      vbo);
 602            ctx->Driver.UnmapBuffer(ctx, GL_ELEMENT_ARRAY_BUFFER_ARB, bufferobj);
 603
 604            bufferobj = vbo;
 605            offset = voffset;
 606        }
 607    }
 608
 609    /* Emit the indexbuffer packet:
 610     */
 611    {
 612       struct brw_indexbuffer ib;
 613       dri_bo *buffer = intel_bufferobj_buffer(intel,
 614                                               intel_buffer_object(bufferobj),
 615                                               INTEL_READ);
 616
 617       memset(&ib, 0, sizeof(ib));
 618
 619       ib.header.bits.opcode = CMD_INDEX_BUFFER;
 620       ib.header.bits.length = sizeof(ib)/4 - 2;
 621       ib.header.bits.index_format = get_index_type(index_buffer->type);
 622       ib.header.bits.cut_index_enable = 0;
 623
 624
 625       BEGIN_BATCH(4, 0);
 626       OUT_BATCH( ib.header.dword );
 627       OUT_RELOC( buffer, DRM_BO_FLAG_MEM_TT | DRM_BO_FLAG_READ, offset);
 628       OUT_RELOC( buffer, DRM_BO_FLAG_MEM_TT | DRM_BO_FLAG_READ,
 629                  offset + ib_size);
 630       OUT_BATCH( 0 );
 631       ADVANCE_BATCH();
 632    }
 633 }