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 "main/glheader.h"
  31 #include "main/context.h"
  32 #include "main/state.h"
  33 #include "main/api_validate.h"
  34 #include "main/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_batchbuffer.h"
  43 #include "intel_buffer_objects.h"
  44 #include "intel_tex.h"
  45
  46 static GLuint double_types[5] = {
  47    0,
  48    BRW_SURFACEFORMAT_R64_FLOAT,
  49    BRW_SURFACEFORMAT_R64G64_FLOAT,
  50    BRW_SURFACEFORMAT_R64G64B64_FLOAT,
  51    BRW_SURFACEFORMAT_R64G64B64A64_FLOAT
  52 };
  53
  54 static GLuint float_types[5] = {
  55    0,
  56    BRW_SURFACEFORMAT_R32_FLOAT,
  57    BRW_SURFACEFORMAT_R32G32_FLOAT,
  58    BRW_SURFACEFORMAT_R32G32B32_FLOAT,
  59    BRW_SURFACEFORMAT_R32G32B32A32_FLOAT
  60 };
  61
  62 static GLuint uint_types_norm[5] = {
  63    0,
  64    BRW_SURFACEFORMAT_R32_UNORM,
  65    BRW_SURFACEFORMAT_R32G32_UNORM,
  66    BRW_SURFACEFORMAT_R32G32B32_UNORM,
  67    BRW_SURFACEFORMAT_R32G32B32A32_UNORM
  68 };
  69
  70 static GLuint uint_types_scale[5] = {
  71    0,
  72    BRW_SURFACEFORMAT_R32_USCALED,
  73    BRW_SURFACEFORMAT_R32G32_USCALED,
  74    BRW_SURFACEFORMAT_R32G32B32_USCALED,
  75    BRW_SURFACEFORMAT_R32G32B32A32_USCALED
  76 };
  77
  78 static GLuint int_types_norm[5] = {
  79    0,
  80    BRW_SURFACEFORMAT_R32_SNORM,
  81    BRW_SURFACEFORMAT_R32G32_SNORM,
  82    BRW_SURFACEFORMAT_R32G32B32_SNORM,
  83    BRW_SURFACEFORMAT_R32G32B32A32_SNORM
  84 };
  85
  86 static GLuint int_types_scale[5] = {
  87    0,
  88    BRW_SURFACEFORMAT_R32_SSCALED,
  89    BRW_SURFACEFORMAT_R32G32_SSCALED,
  90    BRW_SURFACEFORMAT_R32G32B32_SSCALED,
  91    BRW_SURFACEFORMAT_R32G32B32A32_SSCALED
  92 };
  93
  94 static GLuint ushort_types_norm[5] = {
  95    0,
  96    BRW_SURFACEFORMAT_R16_UNORM,
  97    BRW_SURFACEFORMAT_R16G16_UNORM,
  98    BRW_SURFACEFORMAT_R16G16B16_UNORM,
  99    BRW_SURFACEFORMAT_R16G16B16A16_UNORM
 100 };
 101
 102 static GLuint ushort_types_scale[5] = {
 103    0,
 104    BRW_SURFACEFORMAT_R16_USCALED,
 105    BRW_SURFACEFORMAT_R16G16_USCALED,
 106    BRW_SURFACEFORMAT_R16G16B16_USCALED,
 107    BRW_SURFACEFORMAT_R16G16B16A16_USCALED
 108 };
 109
 110 static GLuint short_types_norm[5] = {
 111    0,
 112    BRW_SURFACEFORMAT_R16_SNORM,
 113    BRW_SURFACEFORMAT_R16G16_SNORM,
 114    BRW_SURFACEFORMAT_R16G16B16_SNORM,
 115    BRW_SURFACEFORMAT_R16G16B16A16_SNORM
 116 };
 117
 118 static GLuint short_types_scale[5] = {
 119    0,
 120    BRW_SURFACEFORMAT_R16_SSCALED,
 121    BRW_SURFACEFORMAT_R16G16_SSCALED,
 122    BRW_SURFACEFORMAT_R16G16B16_SSCALED,
 123    BRW_SURFACEFORMAT_R16G16B16A16_SSCALED
 124 };
 125
 126 static GLuint ubyte_types_norm[5] = {
 127    0,
 128    BRW_SURFACEFORMAT_R8_UNORM,
 129    BRW_SURFACEFORMAT_R8G8_UNORM,
 130    BRW_SURFACEFORMAT_R8G8B8_UNORM,
 131    BRW_SURFACEFORMAT_R8G8B8A8_UNORM
 132 };
 133
 134 static GLuint ubyte_types_scale[5] = {
 135    0,
 136    BRW_SURFACEFORMAT_R8_USCALED,
 137    BRW_SURFACEFORMAT_R8G8_USCALED,
 138    BRW_SURFACEFORMAT_R8G8B8_USCALED,
 139    BRW_SURFACEFORMAT_R8G8B8A8_USCALED
 140 };
 141
 142 static GLuint byte_types_norm[5] = {
 143    0,
 144    BRW_SURFACEFORMAT_R8_SNORM,
 145    BRW_SURFACEFORMAT_R8G8_SNORM,
 146    BRW_SURFACEFORMAT_R8G8B8_SNORM,
 147    BRW_SURFACEFORMAT_R8G8B8A8_SNORM
 148 };
 149
 150 static GLuint byte_types_scale[5] = {
 151    0,
 152    BRW_SURFACEFORMAT_R8_SSCALED,
 153    BRW_SURFACEFORMAT_R8G8_SSCALED,
 154    BRW_SURFACEFORMAT_R8G8B8_SSCALED,
 155    BRW_SURFACEFORMAT_R8G8B8A8_SSCALED
 156 };
 157
 158
 159 static GLuint get_surface_type( GLenum type, GLuint size, GLboolean normalized )
 160 {
 161    if (INTEL_DEBUG & DEBUG_VERTS)
 162       _mesa_printf("type %s size %d normalized %d\n",
 163                    _mesa_lookup_enum_by_nr(type), size, normalized);
 164
 165    if (normalized) {
 166       switch (type) {
 167       case GL_DOUBLE: return double_types[size];
 168       case GL_FLOAT: return float_types[size];
 169       case GL_INT: return int_types_norm[size];
 170       case GL_SHORT: return short_types_norm[size];
 171       case GL_BYTE: return byte_types_norm[size];
 172       case GL_UNSIGNED_INT: return uint_types_norm[size];
 173       case GL_UNSIGNED_SHORT: return ushort_types_norm[size];
 174       case GL_UNSIGNED_BYTE: return ubyte_types_norm[size];
 175       default: assert(0); return 0;
 176       }
 177    }
 178    else {
 179       switch (type) {
 180       case GL_DOUBLE: return double_types[size];
 181       case GL_FLOAT: return float_types[size];
 182       case GL_INT: return int_types_scale[size];
 183       case GL_SHORT: return short_types_scale[size];
 184       case GL_BYTE: return byte_types_scale[size];
 185       case GL_UNSIGNED_INT: return uint_types_scale[size];
 186       case GL_UNSIGNED_SHORT: return ushort_types_scale[size];
 187       case GL_UNSIGNED_BYTE: return ubyte_types_scale[size];
 188       default: assert(0); return 0;
 189       }
 190    }
 191 }
 192
 193
 194 static GLuint get_size( GLenum type )
 195 {
 196    switch (type) {
 197    case GL_DOUBLE: return sizeof(GLdouble);
 198    case GL_FLOAT: return sizeof(GLfloat);
 199    case GL_INT: return sizeof(GLint);
 200    case GL_SHORT: return sizeof(GLshort);
 201    case GL_BYTE: return sizeof(GLbyte);
 202    case GL_UNSIGNED_INT: return sizeof(GLuint);
 203    case GL_UNSIGNED_SHORT: return sizeof(GLushort);
 204    case GL_UNSIGNED_BYTE: return sizeof(GLubyte);
 205    default: return 0;
 206    }
 207 }
 208
 209 static GLuint get_index_type(GLenum type)
 210 {
 211    switch (type) {
 212    case GL_UNSIGNED_BYTE:  return BRW_INDEX_BYTE;
 213    case GL_UNSIGNED_SHORT: return BRW_INDEX_WORD;
 214    case GL_UNSIGNED_INT:   return BRW_INDEX_DWORD;
 215    default: assert(0); return 0;
 216    }
 217 }
 218
 219 static void wrap_buffers( struct brw_context *brw,
 220                           GLuint size )
 221 {
 222    if (size < BRW_UPLOAD_INIT_SIZE)
 223       size = BRW_UPLOAD_INIT_SIZE;
 224
 225    brw->vb.upload.offset = 0;
 226
 227    if (brw->vb.upload.bo != NULL)
 228       dri_bo_unreference(brw->vb.upload.bo);
 229    brw->vb.upload.bo = dri_bo_alloc(brw->intel.bufmgr, "temporary VBO",
 230                                     size, 1);
 231
 232    /* Set the internal VBO\ to no-backing-store.  We only use them as a
 233     * temporary within a brw_try_draw_prims while the lock is held.
 234     */
 235    /* DON'T DO THIS AS IF WE HAVE TO RE-ORG MEMORY WE NEED SOMEWHERE WITH
 236       FAKE TO PUSH THIS STUFF */
 237 //   if (!brw->intel.ttm)
 238 //      dri_bo_fake_disable_backing_store(brw->vb.upload.bo, NULL, NULL);
 239 }
 240
 241 static void get_space( struct brw_context *brw,
 242                        GLuint size,
 243                        dri_bo **bo_return,
 244                        GLuint *offset_return )
 245 {
 246    size = ALIGN(size, 64);
 247
 248    if (brw->vb.upload.bo == NULL ||
 249        brw->vb.upload.offset + size > brw->vb.upload.bo->size) {
 250       wrap_buffers(brw, size);
 251    }
 252
 253    assert(*bo_return == NULL);
 254    dri_bo_reference(brw->vb.upload.bo);
 255    *bo_return = brw->vb.upload.bo;
 256    *offset_return = brw->vb.upload.offset;
 257    brw->vb.upload.offset += size;
 258 }
 259
 260 static void
 261 copy_array_to_vbo_array( struct brw_context *brw,
 262                          struct brw_vertex_element *element,
 263                          GLuint dst_stride)
 264 {
 265    GLuint size = element->count * dst_stride;
 266
 267    get_space(brw, size, &element->bo, &element->offset);
 268
 269    if (element->glarray->StrideB == 0) {
 270       assert(element->count == 1);
 271       element->stride = 0;
 272    } else {
 273       element->stride = dst_stride;
 274    }
 275
 276    if (dst_stride == element->glarray->StrideB) {
 277       dri_bo_subdata(element->bo,
 278                      element->offset,
 279                      size,
 280                      element->glarray->Ptr);
 281    } else {
 282       void *data;
 283       char *dest;
 284       const char *src = element->glarray->Ptr;
 285       int i;
 286
 287       data = _mesa_malloc(dst_stride * element->count);
 288       dest = data;
 289       for (i = 0; i < element->count; i++) {
 290          memcpy(dest, src, dst_stride);
 291          src += element->glarray->StrideB;
 292          dest += dst_stride;
 293       }
 294
 295       dri_bo_subdata(element->bo,
 296                      element->offset,
 297                      size,
 298                      data);
 299       _mesa_free(data);
 300    }
 301 }
 302
 303 static void brw_prepare_vertices(struct brw_context *brw)
 304 {
 305    GLcontext *ctx = &brw->intel.ctx;
 306    struct intel_context *intel = intel_context(ctx);
 307    GLuint tmp = brw->vs.prog_data->inputs_read;
 308    GLuint i;
 309    const unsigned char *ptr = NULL;
 310    GLuint interleave = 0;
 311    unsigned int min_index = brw->vb.min_index;
 312    unsigned int max_index = brw->vb.max_index;
 313
 314    struct brw_vertex_element *enabled[VERT_ATTRIB_MAX];
 315    GLuint nr_enabled = 0;
 316
 317    struct brw_vertex_element *upload[VERT_ATTRIB_MAX];
 318    GLuint nr_uploads = 0;
 319
 320    /* First build an array of pointers to ve's in vb.inputs_read
 321     */
 322    if (0)
 323       _mesa_printf("%s %d..%d\n", __FUNCTION__, min_index, max_index);
 324
 325    /* Accumulate the list of enabled arrays. */
 326    while (tmp) {
 327       GLuint i = _mesa_ffsll(tmp)-1;
 328       struct brw_vertex_element *input = &brw->vb.inputs[i];
 329
 330       tmp &= ~(1<<i);
 331       enabled[nr_enabled++] = input;
 332    }
 333
 334    /* XXX: In the rare cases where this happens we fallback all
 335     * the way to software rasterization, although a tnl fallback
 336     * would be sufficient.  I don't know of *any* real world
 337     * cases with > 17 vertex attributes enabled, so it probably
 338     * isn't an issue at this point.
 339     */
 340    if (nr_enabled >= BRW_VEP_MAX) {
 341       intel->Fallback = 1;
 342       return;
 343    }
 344
 345    for (i = 0; i < nr_enabled; i++) {
 346       struct brw_vertex_element *input = enabled[i];
 347
 348       input->element_size = get_size(input->glarray->Type) * input->glarray->Size;
 349       input->count = input->glarray->StrideB ? max_index + 1 - min_index : 1;
 350
 351       if (input->glarray->BufferObj->Name != 0) {
 352          struct intel_buffer_object *intel_buffer =
 353             intel_buffer_object(input->glarray->BufferObj);
 354
 355          /* Named buffer object: Just reference its contents directly. */
 356          dri_bo_unreference(input->bo);
 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       } else {
 363          if (input->bo != NULL) {
 364             /* Already-uploaded vertex data is present from a previous
 365              * prepare_vertices, but we had to re-validate state due to
 366              * check_aperture failing and a new batch being produced.
 367              */
 368             continue;
 369          }
 370
 371          /* Queue the buffer object up to be uploaded in the next pass,
 372           * when we've decided if we're doing interleaved or not.
 373           */
 374          if (i == 0) {
 375             /* Position array not properly enabled:
 376              */
 377             if (input->glarray->StrideB == 0) {
 378                intel->Fallback = 1;
 379                return;
 380             }
 381
 382             interleave = input->glarray->StrideB;
 383             ptr = input->glarray->Ptr;
 384          }
 385          else if (interleave != input->glarray->StrideB ||
 386                   (const unsigned char *)input->glarray->Ptr - ptr < 0 ||
 387                   (const unsigned char *)input->glarray->Ptr - ptr > interleave)
 388          {
 389             interleave = 0;
 390          }
 391
 392          upload[nr_uploads++] = input;
 393
 394          /* We rebase drawing to start at element zero only when
 395           * varyings are not in vbos, which means we can end up
 396           * uploading non-varying arrays (stride != 0) when min_index
 397           * is zero.  This doesn't matter as the amount to upload is
 398           * the same for these arrays whether the draw call is rebased
 399           * or not - we just have to upload the one element.
 400           */
 401          assert(min_index == 0 || input->glarray->StrideB == 0);
 402       }
 403    }
 404
 405    /* Handle any arrays to be uploaded. */
 406    if (nr_uploads > 1 && interleave && interleave <= 256) {
 407       /* All uploads are interleaved, so upload the arrays together as
 408        * interleaved.  First, upload the contents and set up upload[0].
 409        */
 410       copy_array_to_vbo_array(brw, upload[0], interleave);
 411
 412       for (i = 1; i < nr_uploads; i++) {
 413          /* Then, just point upload[i] at upload[0]'s buffer. */
 414          upload[i]->stride = interleave;
 415          upload[i]->offset = upload[0]->offset +
 416             ((const unsigned char *)upload[i]->glarray->Ptr - ptr);
 417          upload[i]->bo = upload[0]->bo;
 418          dri_bo_reference(upload[i]->bo);
 419       }
 420    }
 421    else {
 422       /* Upload non-interleaved arrays */
 423       for (i = 0; i < nr_uploads; i++) {
 424           copy_array_to_vbo_array(brw, upload[i], upload[i]->element_size);
 425       }
 426    }
 427
 428    brw_prepare_query_begin(brw);
 429
 430    for (i = 0; i < nr_enabled; i++) {
 431       struct brw_vertex_element *input = enabled[i];
 432
 433       brw_add_validated_bo(brw, input->bo);
 434    }
 435 }
 436
 437 static void brw_emit_vertices(struct brw_context *brw)
 438 {
 439    GLcontext *ctx = &brw->intel.ctx;
 440    struct intel_context *intel = intel_context(ctx);
 441    GLuint tmp = brw->vs.prog_data->inputs_read;
 442    struct brw_vertex_element *enabled[VERT_ATTRIB_MAX];
 443    GLuint i;
 444    GLuint nr_enabled = 0;
 445
 446   /* Accumulate the list of enabled arrays. */
 447    while (tmp) {
 448       i = _mesa_ffsll(tmp)-1;
 449       struct brw_vertex_element *input = &brw->vb.inputs[i];
 450
 451       tmp &= ~(1<<i);
 452       enabled[nr_enabled++] = input;
 453    }
 454
 455    brw_emit_query_begin(brw);
 456
 457    /* Now emit VB and VEP state packets.
 458     *
 459     * This still defines a hardware VB for each input, even if they
 460     * are interleaved or from the same VBO.  TBD if this makes a
 461     * performance difference.
 462     */
 463    BEGIN_BATCH(1 + nr_enabled * 4, IGNORE_CLIPRECTS);
 464    OUT_BATCH((CMD_VERTEX_BUFFER << 16) |
 465              ((1 + nr_enabled * 4) - 2));
 466
 467    for (i = 0; i < nr_enabled; i++) {
 468       struct brw_vertex_element *input = enabled[i];
 469
 470       OUT_BATCH((i << BRW_VB0_INDEX_SHIFT) |
 471                 BRW_VB0_ACCESS_VERTEXDATA |
 472                 (input->stride << BRW_VB0_PITCH_SHIFT));
 473       OUT_RELOC(input->bo,
 474                 I915_GEM_DOMAIN_VERTEX, 0,
 475                 input->offset);
 476       OUT_BATCH(brw->vb.max_index);
 477       OUT_BATCH(0); /* Instance data step rate */
 478    }
 479    ADVANCE_BATCH();
 480
 481    BEGIN_BATCH(1 + nr_enabled * 2, IGNORE_CLIPRECTS);
 482    OUT_BATCH((CMD_VERTEX_ELEMENT << 16) | ((1 + nr_enabled * 2) - 2));
 483    for (i = 0; i < nr_enabled; i++) {
 484       struct brw_vertex_element *input = enabled[i];
 485       uint32_t format = get_surface_type(input->glarray->Type,
 486                                          input->glarray->Size,
 487                                          input->glarray->Normalized);
 488       uint32_t comp0 = BRW_VE1_COMPONENT_STORE_SRC;
 489       uint32_t comp1 = BRW_VE1_COMPONENT_STORE_SRC;
 490       uint32_t comp2 = BRW_VE1_COMPONENT_STORE_SRC;
 491       uint32_t comp3 = BRW_VE1_COMPONENT_STORE_SRC;
 492
 493       switch (input->glarray->Size) {
 494       case 0: comp0 = BRW_VE1_COMPONENT_STORE_0;
 495       case 1: comp1 = BRW_VE1_COMPONENT_STORE_0;
 496       case 2: comp2 = BRW_VE1_COMPONENT_STORE_0;
 497       case 3: comp3 = BRW_VE1_COMPONENT_STORE_1_FLT;
 498          break;
 499       }
 500
 501       OUT_BATCH((i << BRW_VE0_INDEX_SHIFT) |
 502                 BRW_VE0_VALID |
 503                 (format << BRW_VE0_FORMAT_SHIFT) |
 504                 (0 << BRW_VE0_SRC_OFFSET_SHIFT));
 505       OUT_BATCH((comp0 << BRW_VE1_COMPONENT_0_SHIFT) |
 506                 (comp1 << BRW_VE1_COMPONENT_1_SHIFT) |
 507                 (comp2 << BRW_VE1_COMPONENT_2_SHIFT) |
 508                 (comp3 << BRW_VE1_COMPONENT_3_SHIFT) |
 509                 ((i * 4) << BRW_VE1_DST_OFFSET_SHIFT));
 510    }
 511    ADVANCE_BATCH();
 512 }
 513
 514 const struct brw_tracked_state brw_vertices = {
 515    .dirty = {
 516       .mesa = 0,
 517       .brw = BRW_NEW_BATCH | BRW_NEW_VERTICES,
 518       .cache = 0,
 519    },
 520    .prepare = brw_prepare_vertices,
 521    .emit = brw_emit_vertices,
 522 };
 523
 524 static void brw_prepare_indices(struct brw_context *brw)
 525 {
 526    GLcontext *ctx = &brw->intel.ctx;
 527    struct intel_context *intel = &brw->intel;
 528    const struct _mesa_index_buffer *index_buffer = brw->ib.ib;
 529    GLuint ib_size;
 530    dri_bo *bo = NULL;
 531    struct gl_buffer_object *bufferobj;
 532    GLuint offset;
 533
 534    if (index_buffer == NULL)
 535       return;
 536
 537    ib_size = get_size(index_buffer->type) * index_buffer->count;
 538    bufferobj = index_buffer->obj;;
 539
 540    /* Turn into a proper VBO:
 541     */
 542    if (!bufferobj->Name) {
 543
 544       /* Get new bufferobj, offset:
 545        */
 546       get_space(brw, ib_size, &bo, &offset);
 547
 548       /* Straight upload
 549        */
 550       dri_bo_subdata(bo, offset, ib_size, index_buffer->ptr);
 551    } else {
 552       offset = (GLuint)index_buffer->ptr;
 553
 554       /* If the index buffer isn't aligned to its element size, we have to
 555        * rebase it into a temporary.
 556        */
 557        if ((get_size(index_buffer->type) - 1) & offset) {
 558            GLubyte *map = ctx->Driver.MapBuffer(ctx,
 559                                                 GL_ELEMENT_ARRAY_BUFFER_ARB,
 560                                                 GL_DYNAMIC_DRAW_ARB,
 561                                                 bufferobj);
 562            map += offset;
 563
 564            get_space(brw, ib_size, &bo, &offset);
 565
 566            dri_bo_subdata(bo, offset, ib_size, map);
 567
 568            ctx->Driver.UnmapBuffer(ctx, GL_ELEMENT_ARRAY_BUFFER_ARB, bufferobj);
 569        } else {
 570           bo = intel_bufferobj_buffer(intel, intel_buffer_object(bufferobj),
 571                                       INTEL_READ);
 572           dri_bo_reference(bo);
 573        }
 574    }
 575
 576    dri_bo_unreference(brw->ib.bo);
 577    brw->ib.bo = bo;
 578    brw->ib.offset = offset;
 579
 580    brw_add_validated_bo(brw, brw->ib.bo);
 581 }
 582
 583 static void brw_emit_indices(struct brw_context *brw)
 584 {
 585    struct intel_context *intel = &brw->intel;
 586    const struct _mesa_index_buffer *index_buffer = brw->ib.ib;
 587    GLuint ib_size;
 588
 589    if (index_buffer == NULL)
 590       return;
 591
 592    ib_size = get_size(index_buffer->type) * index_buffer->count;
 593
 594    /* Emit the indexbuffer packet:
 595     */
 596    {
 597       struct brw_indexbuffer ib;
 598
 599       memset(&ib, 0, sizeof(ib));
 600
 601       ib.header.bits.opcode = CMD_INDEX_BUFFER;
 602       ib.header.bits.length = sizeof(ib)/4 - 2;
 603       ib.header.bits.index_format = get_index_type(index_buffer->type);
 604       ib.header.bits.cut_index_enable = 0;
 605
 606
 607       BEGIN_BATCH(4, IGNORE_CLIPRECTS);
 608       OUT_BATCH( ib.header.dword );
 609       OUT_RELOC(brw->ib.bo,
 610                 I915_GEM_DOMAIN_VERTEX, 0,
 611                 brw->ib.offset);
 612       OUT_RELOC(brw->ib.bo,
 613                 I915_GEM_DOMAIN_VERTEX, 0,
 614                 brw->ib.offset + ib_size);
 615       OUT_BATCH( 0 );
 616       ADVANCE_BATCH();
 617    }
 618 }
 619
 620 const struct brw_tracked_state brw_indices = {
 621    .dirty = {
 622       .mesa = 0,
 623       .brw = BRW_NEW_BATCH | BRW_NEW_INDICES,
 624       .cache = 0,
 625    },
 626    .prepare = brw_prepare_indices,
 627    .emit = brw_emit_indices,
 628 };