src/mesa/state_tracker/st_cb_bufferobjects.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   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 VMWARE 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 /**
  30  * Functions for pixel buffer objects and vertex/element buffer objects.
  31  */
  32
  33
  34 #include <inttypes.h>  /* for PRId64 macro */
  35
  36 #include "main/errors.h"
  37 #include "main/imports.h"
  38 #include "main/mtypes.h"
  39 #include "main/arrayobj.h"
  40 #include "main/bufferobj.h"
  41
  42 #include "st_context.h"
  43 #include "st_cb_bufferobjects.h"
  44 #include "st_cb_memoryobjects.h"
  45 #include "st_debug.h"
  46 #include "st_util.h"
  47
  48 #include "pipe/p_context.h"
  49 #include "pipe/p_defines.h"
  50 #include "util/u_inlines.h"
  51
  52
  53 /**
  54  * There is some duplication between mesa's bufferobjects and our
  55  * bufmgr buffers.  Both have an integer handle and a hashtable to
  56  * lookup an opaque structure.  It would be nice if the handles and
  57  * internal structure where somehow shared.
  58  */
  59 static struct gl_buffer_object *
  60 st_bufferobj_alloc(struct gl_context *ctx, GLuint name)
  61 {
  62    struct st_buffer_object *st_obj = ST_CALLOC_STRUCT(st_buffer_object);
  63
  64    if (!st_obj)
  65       return NULL;
  66
  67    _mesa_initialize_buffer_object(ctx, &st_obj->Base, name);
  68
  69    return &st_obj->Base;
  70 }
  71
  72
  73
  74 /**
  75  * Deallocate/free a vertex/pixel buffer object.
  76  * Called via glDeleteBuffersARB().
  77  */
  78 static void
  79 st_bufferobj_free(struct gl_context *ctx, struct gl_buffer_object *obj)
  80 {
  81    struct st_buffer_object *st_obj = st_buffer_object(obj);
  82
  83    assert(obj->RefCount == 0);
  84    _mesa_buffer_unmap_all_mappings(ctx, obj);
  85
  86    if (st_obj->buffer)
  87       pipe_resource_reference(&st_obj->buffer, NULL);
  88
  89    _mesa_delete_buffer_object(ctx, obj);
  90 }
  91
  92
  93
  94 /**
  95  * Replace data in a subrange of buffer object.  If the data range
  96  * specified by size + offset extends beyond the end of the buffer or
  97  * if data is NULL, no copy is performed.
  98  * Called via glBufferSubDataARB().
  99  */
 100 static void
 101 st_bufferobj_subdata(struct gl_context *ctx,
 102                      GLintptrARB offset,
 103                      GLsizeiptrARB size,
 104                      const void * data, struct gl_buffer_object *obj)
 105 {
 106    struct st_buffer_object *st_obj = st_buffer_object(obj);
 107
 108    /* we may be called from VBO code, so double-check params here */
 109    assert(offset >= 0);
 110    assert(size >= 0);
 111    assert(offset + size <= obj->Size);
 112
 113    if (!size)
 114       return;
 115
 116    /*
 117     * According to ARB_vertex_buffer_object specification, if data is null,
 118     * then the contents of the buffer object's data store is undefined. We just
 119     * ignore, and leave it unchanged.
 120     */
 121    if (!data)
 122       return;
 123
 124    if (!st_obj->buffer) {
 125       /* we probably ran out of memory during buffer allocation */
 126       return;
 127    }
 128
 129    /* Now that transfers are per-context, we don't have to figure out
 130     * flushing here.  Usually drivers won't need to flush in this case
 131     * even if the buffer is currently referenced by hardware - they
 132     * just queue the upload as dma rather than mapping the underlying
 133     * buffer directly.
 134     *
 135     * If the buffer is mapped, suppress implicit buffer range invalidation
 136     * by using PIPE_TRANSFER_MAP_DIRECTLY.
 137     */
 138    struct pipe_context *pipe = st_context(ctx)->pipe;
 139
 140    pipe->buffer_subdata(pipe, st_obj->buffer,
 141                         _mesa_bufferobj_mapped(obj, MAP_USER) ?
 142                            PIPE_TRANSFER_MAP_DIRECTLY : 0,
 143                         offset, size, data);
 144 }
 145
 146
 147 /**
 148  * Called via glGetBufferSubDataARB().
 149  */
 150 static void
 151 st_bufferobj_get_subdata(struct gl_context *ctx,
 152                          GLintptrARB offset,
 153                          GLsizeiptrARB size,
 154                          void * data, struct gl_buffer_object *obj)
 155 {
 156    struct st_buffer_object *st_obj = st_buffer_object(obj);
 157
 158    /* we may be called from VBO code, so double-check params here */
 159    assert(offset >= 0);
 160    assert(size >= 0);
 161    assert(offset + size <= obj->Size);
 162
 163    if (!size)
 164       return;
 165
 166    if (!st_obj->buffer) {
 167       /* we probably ran out of memory during buffer allocation */
 168       return;
 169    }
 170
 171    pipe_buffer_read(st_context(ctx)->pipe, st_obj->buffer,
 172                     offset, size, data);
 173 }
 174
 175
 176 /**
 177  * Return bitmask of PIPE_BIND_x flags corresponding a GL buffer target.
 178  */
 179 static unsigned
 180 buffer_target_to_bind_flags(GLenum target)
 181 {
 182    switch (target) {
 183    case GL_PIXEL_PACK_BUFFER_ARB:
 184    case GL_PIXEL_UNPACK_BUFFER_ARB:
 185       return PIPE_BIND_RENDER_TARGET | PIPE_BIND_SAMPLER_VIEW;
 186    case GL_ARRAY_BUFFER_ARB:
 187       return PIPE_BIND_VERTEX_BUFFER;
 188    case GL_ELEMENT_ARRAY_BUFFER_ARB:
 189       return PIPE_BIND_INDEX_BUFFER;
 190    case GL_TEXTURE_BUFFER:
 191       return PIPE_BIND_SAMPLER_VIEW;
 192    case GL_TRANSFORM_FEEDBACK_BUFFER:
 193       return PIPE_BIND_STREAM_OUTPUT;
 194    case GL_UNIFORM_BUFFER:
 195       return PIPE_BIND_CONSTANT_BUFFER;
 196    case GL_DRAW_INDIRECT_BUFFER:
 197    case GL_PARAMETER_BUFFER_ARB:
 198       return PIPE_BIND_COMMAND_ARGS_BUFFER;
 199    case GL_ATOMIC_COUNTER_BUFFER:
 200    case GL_SHADER_STORAGE_BUFFER:
 201       return PIPE_BIND_SHADER_BUFFER;
 202    case GL_QUERY_BUFFER:
 203       return PIPE_BIND_QUERY_BUFFER;
 204    default:
 205       return 0;
 206    }
 207 }
 208
 209
 210 /**
 211  * Return bitmask of PIPE_RESOURCE_x flags corresponding to GL_MAP_x flags.
 212  */
 213 static unsigned
 214 storage_flags_to_buffer_flags(GLbitfield storageFlags)
 215 {
 216    unsigned flags = 0;
 217    if (storageFlags & GL_MAP_PERSISTENT_BIT)
 218       flags |= PIPE_RESOURCE_FLAG_MAP_PERSISTENT;
 219    if (storageFlags & GL_MAP_COHERENT_BIT)
 220       flags |= PIPE_RESOURCE_FLAG_MAP_COHERENT;
 221    if (storageFlags & GL_SPARSE_STORAGE_BIT_ARB)
 222       flags |= PIPE_RESOURCE_FLAG_SPARSE;
 223    return flags;
 224 }
 225
 226
 227 /**
 228  * From a buffer object's target, immutability flag, storage flags and
 229  * usage hint, return a pipe_resource_usage value (PIPE_USAGE_DYNAMIC,
 230  * STREAM, etc).
 231  */
 232 static enum pipe_resource_usage
 233 buffer_usage(GLenum target, GLboolean immutable,
 234              GLbitfield storageFlags, GLenum usage)
 235 {
 236    if (immutable) {
 237       /* BufferStorage */
 238       if (storageFlags & GL_CLIENT_STORAGE_BIT) {
 239          if (storageFlags & GL_MAP_READ_BIT)
 240             return PIPE_USAGE_STAGING;
 241          else
 242             return PIPE_USAGE_STREAM;
 243       } else {
 244          return PIPE_USAGE_DEFAULT;
 245       }
 246    }
 247    else {
 248       /* BufferData */
 249       switch (usage) {
 250       case GL_DYNAMIC_DRAW:
 251       case GL_DYNAMIC_COPY:
 252          return PIPE_USAGE_DYNAMIC;
 253       case GL_STREAM_DRAW:
 254       case GL_STREAM_COPY:
 255          /* XXX: Remove this test and fall-through when we have PBO unpacking
 256           * acceleration. Right now, PBO unpacking is done by the CPU, so we
 257           * have to make sure CPU reads are fast.
 258           */
 259          if (target != GL_PIXEL_UNPACK_BUFFER_ARB) {
 260             return PIPE_USAGE_STREAM;
 261          }
 262          /* fall through */
 263       case GL_STATIC_READ:
 264       case GL_DYNAMIC_READ:
 265       case GL_STREAM_READ:
 266          return PIPE_USAGE_STAGING;
 267       case GL_STATIC_DRAW:
 268       case GL_STATIC_COPY:
 269       default:
 270          return PIPE_USAGE_DEFAULT;
 271       }
 272    }
 273 }
 274
 275
 276 static ALWAYS_INLINE GLboolean
 277 bufferobj_data(struct gl_context *ctx,
 278                GLenum target,
 279                GLsizeiptrARB size,
 280                const void *data,
 281                struct gl_memory_object *memObj,
 282                GLuint64 offset,
 283                GLenum usage,
 284                GLbitfield storageFlags,
 285                struct gl_buffer_object *obj)
 286 {
 287    struct st_context *st = st_context(ctx);
 288    struct pipe_context *pipe = st->pipe;
 289    struct pipe_screen *screen = pipe->screen;
 290    struct st_buffer_object *st_obj = st_buffer_object(obj);
 291    struct st_memory_object *st_mem_obj = st_memory_object(memObj);
 292    bool is_mapped = _mesa_bufferobj_mapped(obj, MAP_USER);
 293
 294    if (target != GL_EXTERNAL_VIRTUAL_MEMORY_BUFFER_AMD &&
 295        size && st_obj->buffer &&
 296        st_obj->Base.Size == size &&
 297        st_obj->Base.Usage == usage &&
 298        st_obj->Base.StorageFlags == storageFlags) {
 299       if (data) {
 300          /* Just discard the old contents and write new data.
 301           * This should be the same as creating a new buffer, but we avoid
 302           * a lot of validation in Mesa.
 303           *
 304           * If the buffer is mapped, we can't discard it.
 305           *
 306           * PIPE_TRANSFER_MAP_DIRECTLY supresses implicit buffer range
 307           * invalidation.
 308           */
 309          pipe->buffer_subdata(pipe, st_obj->buffer,
 310                               is_mapped ? PIPE_TRANSFER_MAP_DIRECTLY :
 311                                           PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE,
 312                               0, size, data);
 313          return GL_TRUE;
 314       } else if (is_mapped) {
 315          return GL_TRUE; /* can't reallocate, nothing to do */
 316       } else if (screen->get_param(screen, PIPE_CAP_INVALIDATE_BUFFER)) {
 317          pipe->invalidate_resource(pipe, st_obj->buffer);
 318          return GL_TRUE;
 319       }
 320    }
 321
 322    st_obj->Base.Size = size;
 323    st_obj->Base.Usage = usage;
 324    st_obj->Base.StorageFlags = storageFlags;
 325
 326    pipe_resource_reference( &st_obj->buffer, NULL );
 327
 328    const unsigned bindings = buffer_target_to_bind_flags(target);
 329
 330    if (ST_DEBUG & DEBUG_BUFFER) {
 331       debug_printf("Create buffer size %" PRId64 " bind 0x%x\n",
 332                    (int64_t) size, bindings);
 333    }
 334
 335    if (size != 0) {
 336       struct pipe_resource buffer;
 337
 338       memset(&buffer, 0, sizeof buffer);
 339       buffer.target = PIPE_BUFFER;
 340       buffer.format = PIPE_FORMAT_R8_UNORM; /* want TYPELESS or similar */
 341       buffer.bind = bindings;
 342       buffer.usage =
 343          buffer_usage(target, st_obj->Base.Immutable, storageFlags, usage);
 344       buffer.flags = storage_flags_to_buffer_flags(storageFlags);
 345       buffer.width0 = size;
 346       buffer.height0 = 1;
 347       buffer.depth0 = 1;
 348       buffer.array_size = 1;
 349
 350       if (st_mem_obj) {
 351          st_obj->buffer = screen->resource_from_memobj(screen, &buffer,
 352                                                        st_mem_obj->memory,
 353                                                        offset);
 354       }
 355       else if (target == GL_EXTERNAL_VIRTUAL_MEMORY_BUFFER_AMD) {
 356          st_obj->buffer =
 357             screen->resource_from_user_memory(screen, &buffer, (void*)data);
 358       }
 359       else {
 360          st_obj->buffer = screen->resource_create(screen, &buffer);
 361
 362          if (st_obj->buffer && data)
 363             pipe_buffer_write(pipe, st_obj->buffer, 0, size, data);
 364       }
 365
 366       if (!st_obj->buffer) {
 367          /* out of memory */
 368          st_obj->Base.Size = 0;
 369          return GL_FALSE;
 370       }
 371    }
 372
 373    /* The current buffer may be bound, so we have to revalidate all atoms that
 374     * might be using it.
 375     */
 376    if (st_obj->Base.UsageHistory & USAGE_ARRAY_BUFFER)
 377       ctx->NewDriverState |= ST_NEW_VERTEX_ARRAYS;
 378    /* if (st_obj->Base.UsageHistory & USAGE_ELEMENT_ARRAY_BUFFER) */
 379    /*    ctx->NewDriverState |= TODO: Handle indices as gallium state; */
 380    if (st_obj->Base.UsageHistory & USAGE_UNIFORM_BUFFER)
 381       ctx->NewDriverState |= ST_NEW_UNIFORM_BUFFER;
 382    if (st_obj->Base.UsageHistory & USAGE_SHADER_STORAGE_BUFFER)
 383       ctx->NewDriverState |= ST_NEW_STORAGE_BUFFER;
 384    if (st_obj->Base.UsageHistory & USAGE_TEXTURE_BUFFER)
 385       ctx->NewDriverState |= ST_NEW_SAMPLER_VIEWS | ST_NEW_IMAGE_UNITS;
 386    if (st_obj->Base.UsageHistory & USAGE_ATOMIC_COUNTER_BUFFER)
 387       ctx->NewDriverState |= ctx->DriverFlags.NewAtomicBuffer;
 388
 389    return GL_TRUE;
 390 }
 391
 392 /**
 393  * Allocate space for and store data in a buffer object.  Any data that was
 394  * previously stored in the buffer object is lost.  If data is NULL,
 395  * memory will be allocated, but no copy will occur.
 396  * Called via ctx->Driver.BufferData().
 397  * \return GL_TRUE for success, GL_FALSE if out of memory
 398  */
 399 static GLboolean
 400 st_bufferobj_data(struct gl_context *ctx,
 401                   GLenum target,
 402                   GLsizeiptrARB size,
 403                   const void *data,
 404                   GLenum usage,
 405                   GLbitfield storageFlags,
 406                   struct gl_buffer_object *obj)
 407 {
 408    return bufferobj_data(ctx, target, size, data, NULL, 0, usage, storageFlags, obj);
 409 }
 410
 411 static GLboolean
 412 st_bufferobj_data_mem(struct gl_context *ctx,
 413                       GLenum target,
 414                       GLsizeiptrARB size,
 415                       struct gl_memory_object *memObj,
 416                       GLuint64 offset,
 417                       GLenum usage,
 418                       struct gl_buffer_object *bufObj)
 419 {
 420    return bufferobj_data(ctx, target, size, NULL, memObj, offset, usage, 0, bufObj);
 421 }
 422
 423 /**
 424  * Called via glInvalidateBuffer(Sub)Data.
 425  */
 426 static void
 427 st_bufferobj_invalidate(struct gl_context *ctx,
 428                         struct gl_buffer_object *obj,
 429                         GLintptr offset,
 430                         GLsizeiptr size)
 431 {
 432    struct st_context *st = st_context(ctx);
 433    struct pipe_context *pipe = st->pipe;
 434    struct st_buffer_object *st_obj = st_buffer_object(obj);
 435
 436    /* We ignore partial invalidates. */
 437    if (offset != 0 || size != obj->Size)
 438       return;
 439
 440    /* If the buffer is mapped, we can't invalidate it. */
 441    if (!st_obj->buffer || _mesa_bufferobj_mapped(obj, MAP_USER))
 442       return;
 443
 444    pipe->invalidate_resource(pipe, st_obj->buffer);
 445 }
 446
 447
 448 /**
 449  * Convert GLbitfield of GL_MAP_x flags to gallium pipe_transfer_usage flags.
 450  * \param wholeBuffer  is the whole buffer being mapped?
 451  */
 452 enum pipe_transfer_usage
 453 st_access_flags_to_transfer_flags(GLbitfield access, bool wholeBuffer)
 454 {
 455    enum pipe_transfer_usage flags = 0;
 456
 457    if (access & GL_MAP_WRITE_BIT)
 458       flags |= PIPE_TRANSFER_WRITE;
 459
 460    if (access & GL_MAP_READ_BIT)
 461       flags |= PIPE_TRANSFER_READ;
 462
 463    if (access & GL_MAP_FLUSH_EXPLICIT_BIT)
 464       flags |= PIPE_TRANSFER_FLUSH_EXPLICIT;
 465
 466    if (access & GL_MAP_INVALIDATE_BUFFER_BIT) {
 467       flags |= PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE;
 468    }
 469    else if (access & GL_MAP_INVALIDATE_RANGE_BIT) {
 470       if (wholeBuffer)
 471          flags |= PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE;
 472       else
 473          flags |= PIPE_TRANSFER_DISCARD_RANGE;
 474    }
 475
 476    if (access & GL_MAP_UNSYNCHRONIZED_BIT)
 477       flags |= PIPE_TRANSFER_UNSYNCHRONIZED;
 478
 479    if (access & GL_MAP_PERSISTENT_BIT)
 480       flags |= PIPE_TRANSFER_PERSISTENT;
 481
 482    if (access & GL_MAP_COHERENT_BIT)
 483       flags |= PIPE_TRANSFER_COHERENT;
 484
 485    /* ... other flags ...
 486    */
 487
 488    if (access & MESA_MAP_NOWAIT_BIT)
 489       flags |= PIPE_TRANSFER_DONTBLOCK;
 490
 491    return flags;
 492 }
 493
 494
 495 /**
 496  * Called via glMapBufferRange().
 497  */
 498 static void *
 499 st_bufferobj_map_range(struct gl_context *ctx,
 500                        GLintptr offset, GLsizeiptr length, GLbitfield access,
 501                        struct gl_buffer_object *obj,
 502                        gl_map_buffer_index index)
 503 {
 504    struct pipe_context *pipe = st_context(ctx)->pipe;
 505    struct st_buffer_object *st_obj = st_buffer_object(obj);
 506
 507    assert(offset >= 0);
 508    assert(length >= 0);
 509    assert(offset < obj->Size);
 510    assert(offset + length <= obj->Size);
 511
 512    const enum pipe_transfer_usage transfer_flags =
 513       st_access_flags_to_transfer_flags(access,
 514                                         offset == 0 && length == obj->Size);
 515
 516    obj->Mappings[index].Pointer = pipe_buffer_map_range(pipe,
 517                                                         st_obj->buffer,
 518                                                         offset, length,
 519                                                         transfer_flags,
 520                                                         &st_obj->transfer[index]);
 521    if (obj->Mappings[index].Pointer) {
 522       obj->Mappings[index].Offset = offset;
 523       obj->Mappings[index].Length = length;
 524       obj->Mappings[index].AccessFlags = access;
 525    }
 526    else {
 527       st_obj->transfer[index] = NULL;
 528    }
 529
 530    return obj->Mappings[index].Pointer;
 531 }
 532
 533
 534 static void
 535 st_bufferobj_flush_mapped_range(struct gl_context *ctx,
 536                                 GLintptr offset, GLsizeiptr length,
 537                                 struct gl_buffer_object *obj,
 538                                 gl_map_buffer_index index)
 539 {
 540    struct pipe_context *pipe = st_context(ctx)->pipe;
 541    struct st_buffer_object *st_obj = st_buffer_object(obj);
 542
 543    /* Subrange is relative to mapped range */
 544    assert(offset >= 0);
 545    assert(length >= 0);
 546    assert(offset + length <= obj->Mappings[index].Length);
 547    assert(obj->Mappings[index].Pointer);
 548
 549    if (!length)
 550       return;
 551
 552    pipe_buffer_flush_mapped_range(pipe, st_obj->transfer[index],
 553                                   obj->Mappings[index].Offset + offset,
 554                                   length);
 555 }
 556
 557
 558 /**
 559  * Called via glUnmapBufferARB().
 560  */
 561 static GLboolean
 562 st_bufferobj_unmap(struct gl_context *ctx, struct gl_buffer_object *obj,
 563                    gl_map_buffer_index index)
 564 {
 565    struct pipe_context *pipe = st_context(ctx)->pipe;
 566    struct st_buffer_object *st_obj = st_buffer_object(obj);
 567
 568    if (obj->Mappings[index].Length)
 569       pipe_buffer_unmap(pipe, st_obj->transfer[index]);
 570
 571    st_obj->transfer[index] = NULL;
 572    obj->Mappings[index].Pointer = NULL;
 573    obj->Mappings[index].Offset = 0;
 574    obj->Mappings[index].Length = 0;
 575    return GL_TRUE;
 576 }
 577
 578
 579 /**
 580  * Called via glCopyBufferSubData().
 581  */
 582 static void
 583 st_copy_buffer_subdata(struct gl_context *ctx,
 584                        struct gl_buffer_object *src,
 585                        struct gl_buffer_object *dst,
 586                        GLintptr readOffset, GLintptr writeOffset,
 587                        GLsizeiptr size)
 588 {
 589    struct pipe_context *pipe = st_context(ctx)->pipe;
 590    struct st_buffer_object *srcObj = st_buffer_object(src);
 591    struct st_buffer_object *dstObj = st_buffer_object(dst);
 592    struct pipe_box box;
 593
 594    if (!size)
 595       return;
 596
 597    /* buffer should not already be mapped */
 598    assert(!_mesa_check_disallowed_mapping(src));
 599    assert(!_mesa_check_disallowed_mapping(dst));
 600
 601    u_box_1d(readOffset, size, &box);
 602
 603    pipe->resource_copy_region(pipe, dstObj->buffer, 0, writeOffset, 0, 0,
 604                               srcObj->buffer, 0, &box);
 605 }
 606
 607 /**
 608  * Called via glClearBufferSubData().
 609  */
 610 static void
 611 st_clear_buffer_subdata(struct gl_context *ctx,
 612                         GLintptr offset, GLsizeiptr size,
 613                         const void *clearValue,
 614                         GLsizeiptr clearValueSize,
 615                         struct gl_buffer_object *bufObj)
 616 {
 617    struct pipe_context *pipe = st_context(ctx)->pipe;
 618    struct st_buffer_object *buf = st_buffer_object(bufObj);
 619    static const char zeros[16] = {0};
 620
 621    if (!pipe->clear_buffer) {
 622       _mesa_ClearBufferSubData_sw(ctx, offset, size,
 623                                   clearValue, clearValueSize, bufObj);
 624       return;
 625    }
 626
 627    if (!clearValue)
 628       clearValue = zeros;
 629
 630    pipe->clear_buffer(pipe, buf->buffer, offset, size,
 631                       clearValue, clearValueSize);
 632 }
 633
 634 static void
 635 st_bufferobj_page_commitment(struct gl_context *ctx,
 636                              struct gl_buffer_object *bufferObj,
 637                              GLintptr offset, GLsizeiptr size,
 638                              GLboolean commit)
 639 {
 640    struct pipe_context *pipe = st_context(ctx)->pipe;
 641    struct st_buffer_object *buf = st_buffer_object(bufferObj);
 642    struct pipe_box box;
 643
 644    u_box_1d(offset, size, &box);
 645
 646    if (!pipe->resource_commit(pipe, buf->buffer, 0, &box, commit)) {
 647       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBufferPageCommitmentARB(out of memory)");
 648       return;
 649    }
 650 }
 651
 652 void
 653 st_init_bufferobject_functions(struct pipe_screen *screen,
 654                                struct dd_function_table *functions)
 655 {
 656    functions->NewBufferObject = st_bufferobj_alloc;
 657    functions->DeleteBuffer = st_bufferobj_free;
 658    functions->BufferData = st_bufferobj_data;
 659    functions->BufferDataMem = st_bufferobj_data_mem;
 660    functions->BufferSubData = st_bufferobj_subdata;
 661    functions->GetBufferSubData = st_bufferobj_get_subdata;
 662    functions->MapBufferRange = st_bufferobj_map_range;
 663    functions->FlushMappedBufferRange = st_bufferobj_flush_mapped_range;
 664    functions->UnmapBuffer = st_bufferobj_unmap;
 665    functions->CopyBufferSubData = st_copy_buffer_subdata;
 666    functions->ClearBufferSubData = st_clear_buffer_subdata;
 667    functions->BufferPageCommitment = st_bufferobj_page_commitment;
 668
 669    if (screen->get_param(screen, PIPE_CAP_INVALIDATE_BUFFER))
 670       functions->InvalidateBufferSubData = st_bufferobj_invalidate;
 671 }