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
  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       /* These are often read by the CPU, so enable CPU caches. */
 249       if (target == GL_PIXEL_PACK_BUFFER ||
 250           target == GL_PIXEL_UNPACK_BUFFER)
 251          return PIPE_USAGE_STAGING;
 252
 253       /* BufferData */
 254       switch (usage) {
 255       case GL_DYNAMIC_DRAW:
 256       case GL_DYNAMIC_COPY:
 257          return PIPE_USAGE_DYNAMIC;
 258       case GL_STREAM_DRAW:
 259       case GL_STREAM_COPY:
 260          return PIPE_USAGE_STREAM;
 261       case GL_STATIC_READ:
 262       case GL_DYNAMIC_READ:
 263       case GL_STREAM_READ:
 264          return PIPE_USAGE_STAGING;
 265       case GL_STATIC_DRAW:
 266       case GL_STATIC_COPY:
 267       default:
 268          return PIPE_USAGE_DEFAULT;
 269       }
 270    }
 271 }
 272
 273
 274 static ALWAYS_INLINE GLboolean
 275 bufferobj_data(struct gl_context *ctx,
 276                GLenum target,
 277                GLsizeiptrARB size,
 278                const void *data,
 279                struct gl_memory_object *memObj,
 280                GLuint64 offset,
 281                GLenum usage,
 282                GLbitfield storageFlags,
 283                struct gl_buffer_object *obj)
 284 {
 285    struct st_context *st = st_context(ctx);
 286    struct pipe_context *pipe = st->pipe;
 287    struct pipe_screen *screen = pipe->screen;
 288    struct st_buffer_object *st_obj = st_buffer_object(obj);
 289    struct st_memory_object *st_mem_obj = st_memory_object(memObj);
 290    bool is_mapped = _mesa_bufferobj_mapped(obj, MAP_USER);
 291
 292    if (size > UINT32_MAX || offset > UINT32_MAX) {
 293       /* pipe_resource.width0 is 32 bits only and increasing it
 294        * to 64 bits doesn't make much sense since hw support
 295        * for > 4GB resources is limited.
 296        */
 297       st_obj->Base.Size = 0;
 298       return GL_FALSE;
 299    }
 300
 301    if (target != GL_EXTERNAL_VIRTUAL_MEMORY_BUFFER_AMD &&
 302        size && st_obj->buffer &&
 303        st_obj->Base.Size == size &&
 304        st_obj->Base.Usage == usage &&
 305        st_obj->Base.StorageFlags == storageFlags) {
 306       if (data) {
 307          /* Just discard the old contents and write new data.
 308           * This should be the same as creating a new buffer, but we avoid
 309           * a lot of validation in Mesa.
 310           *
 311           * If the buffer is mapped, we can't discard it.
 312           *
 313           * PIPE_TRANSFER_MAP_DIRECTLY supresses implicit buffer range
 314           * invalidation.
 315           */
 316          pipe->buffer_subdata(pipe, st_obj->buffer,
 317                               is_mapped ? PIPE_TRANSFER_MAP_DIRECTLY :
 318                                           PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE,
 319                               0, size, data);
 320          return GL_TRUE;
 321       } else if (is_mapped) {
 322          return GL_TRUE; /* can't reallocate, nothing to do */
 323       } else if (screen->get_param(screen, PIPE_CAP_INVALIDATE_BUFFER)) {
 324          pipe->invalidate_resource(pipe, st_obj->buffer);
 325          return GL_TRUE;
 326       }
 327    }
 328
 329    st_obj->Base.Size = size;
 330    st_obj->Base.Usage = usage;
 331    st_obj->Base.StorageFlags = storageFlags;
 332
 333    pipe_resource_reference( &st_obj->buffer, NULL );
 334
 335    const unsigned bindings = buffer_target_to_bind_flags(target);
 336
 337    if (ST_DEBUG & DEBUG_BUFFER) {
 338       debug_printf("Create buffer size %" PRId64 " bind 0x%x\n",
 339                    (int64_t) size, bindings);
 340    }
 341
 342    if (size != 0) {
 343       struct pipe_resource buffer;
 344
 345       memset(&buffer, 0, sizeof buffer);
 346       buffer.target = PIPE_BUFFER;
 347       buffer.format = PIPE_FORMAT_R8_UNORM; /* want TYPELESS or similar */
 348       buffer.bind = bindings;
 349       buffer.usage =
 350          buffer_usage(target, st_obj->Base.Immutable, storageFlags, usage);
 351       buffer.flags = storage_flags_to_buffer_flags(storageFlags);
 352       buffer.width0 = size;
 353       buffer.height0 = 1;
 354       buffer.depth0 = 1;
 355       buffer.array_size = 1;
 356
 357       if (st_mem_obj) {
 358          st_obj->buffer = screen->resource_from_memobj(screen, &buffer,
 359                                                        st_mem_obj->memory,
 360                                                        offset);
 361       }
 362       else if (target == GL_EXTERNAL_VIRTUAL_MEMORY_BUFFER_AMD) {
 363          st_obj->buffer =
 364             screen->resource_from_user_memory(screen, &buffer, (void*)data);
 365       }
 366       else {
 367          st_obj->buffer = screen->resource_create(screen, &buffer);
 368
 369          if (st_obj->buffer && data)
 370             pipe_buffer_write(pipe, st_obj->buffer, 0, size, data);
 371       }
 372
 373       if (!st_obj->buffer) {
 374          /* out of memory */
 375          st_obj->Base.Size = 0;
 376          return GL_FALSE;
 377       }
 378    }
 379
 380    /* The current buffer may be bound, so we have to revalidate all atoms that
 381     * might be using it.
 382     */
 383    if (st_obj->Base.UsageHistory & USAGE_ARRAY_BUFFER)
 384       ctx->NewDriverState |= ST_NEW_VERTEX_ARRAYS;
 385    /* if (st_obj->Base.UsageHistory & USAGE_ELEMENT_ARRAY_BUFFER) */
 386    /*    ctx->NewDriverState |= TODO: Handle indices as gallium state; */
 387    if (st_obj->Base.UsageHistory & USAGE_UNIFORM_BUFFER)
 388       ctx->NewDriverState |= ST_NEW_UNIFORM_BUFFER;
 389    if (st_obj->Base.UsageHistory & USAGE_SHADER_STORAGE_BUFFER)
 390       ctx->NewDriverState |= ST_NEW_STORAGE_BUFFER;
 391    if (st_obj->Base.UsageHistory & USAGE_TEXTURE_BUFFER)
 392       ctx->NewDriverState |= ST_NEW_SAMPLER_VIEWS | ST_NEW_IMAGE_UNITS;
 393    if (st_obj->Base.UsageHistory & USAGE_ATOMIC_COUNTER_BUFFER)
 394       ctx->NewDriverState |= ctx->DriverFlags.NewAtomicBuffer;
 395
 396    return GL_TRUE;
 397 }
 398
 399 /**
 400  * Allocate space for and store data in a buffer object.  Any data that was
 401  * previously stored in the buffer object is lost.  If data is NULL,
 402  * memory will be allocated, but no copy will occur.
 403  * Called via ctx->Driver.BufferData().
 404  * \return GL_TRUE for success, GL_FALSE if out of memory
 405  */
 406 static GLboolean
 407 st_bufferobj_data(struct gl_context *ctx,
 408                   GLenum target,
 409                   GLsizeiptrARB size,
 410                   const void *data,
 411                   GLenum usage,
 412                   GLbitfield storageFlags,
 413                   struct gl_buffer_object *obj)
 414 {
 415    return bufferobj_data(ctx, target, size, data, NULL, 0, usage, storageFlags, obj);
 416 }
 417
 418 static GLboolean
 419 st_bufferobj_data_mem(struct gl_context *ctx,
 420                       GLenum target,
 421                       GLsizeiptrARB size,
 422                       struct gl_memory_object *memObj,
 423                       GLuint64 offset,
 424                       GLenum usage,
 425                       struct gl_buffer_object *bufObj)
 426 {
 427    return bufferobj_data(ctx, target, size, NULL, memObj, offset, usage, 0, bufObj);
 428 }
 429
 430 /**
 431  * Called via glInvalidateBuffer(Sub)Data.
 432  */
 433 static void
 434 st_bufferobj_invalidate(struct gl_context *ctx,
 435                         struct gl_buffer_object *obj,
 436                         GLintptr offset,
 437                         GLsizeiptr size)
 438 {
 439    struct st_context *st = st_context(ctx);
 440    struct pipe_context *pipe = st->pipe;
 441    struct st_buffer_object *st_obj = st_buffer_object(obj);
 442
 443    /* We ignore partial invalidates. */
 444    if (offset != 0 || size != obj->Size)
 445       return;
 446
 447    /* If the buffer is mapped, we can't invalidate it. */
 448    if (!st_obj->buffer || _mesa_bufferobj_mapped(obj, MAP_USER))
 449       return;
 450
 451    pipe->invalidate_resource(pipe, st_obj->buffer);
 452 }
 453
 454
 455 /**
 456  * Convert GLbitfield of GL_MAP_x flags to gallium pipe_transfer_usage flags.
 457  * \param wholeBuffer  is the whole buffer being mapped?
 458  */
 459 enum pipe_transfer_usage
 460 st_access_flags_to_transfer_flags(GLbitfield access, bool wholeBuffer)
 461 {
 462    enum pipe_transfer_usage flags = 0;
 463
 464    if (access & GL_MAP_WRITE_BIT)
 465       flags |= PIPE_TRANSFER_WRITE;
 466
 467    if (access & GL_MAP_READ_BIT)
 468       flags |= PIPE_TRANSFER_READ;
 469
 470    if (access & GL_MAP_FLUSH_EXPLICIT_BIT)
 471       flags |= PIPE_TRANSFER_FLUSH_EXPLICIT;
 472
 473    if (access & GL_MAP_INVALIDATE_BUFFER_BIT) {
 474       flags |= PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE;
 475    }
 476    else if (access & GL_MAP_INVALIDATE_RANGE_BIT) {
 477       if (wholeBuffer)
 478          flags |= PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE;
 479       else
 480          flags |= PIPE_TRANSFER_DISCARD_RANGE;
 481    }
 482
 483    if (access & GL_MAP_UNSYNCHRONIZED_BIT)
 484       flags |= PIPE_TRANSFER_UNSYNCHRONIZED;
 485
 486    if (access & GL_MAP_PERSISTENT_BIT)
 487       flags |= PIPE_TRANSFER_PERSISTENT;
 488
 489    if (access & GL_MAP_COHERENT_BIT)
 490       flags |= PIPE_TRANSFER_COHERENT;
 491
 492    /* ... other flags ...
 493    */
 494
 495    if (access & MESA_MAP_NOWAIT_BIT)
 496       flags |= PIPE_TRANSFER_DONTBLOCK;
 497    if (access & MESA_MAP_THREAD_SAFE_BIT)
 498       flags |= PIPE_TRANSFER_THREAD_SAFE;
 499
 500    return flags;
 501 }
 502
 503
 504 /**
 505  * Called via glMapBufferRange().
 506  */
 507 static void *
 508 st_bufferobj_map_range(struct gl_context *ctx,
 509                        GLintptr offset, GLsizeiptr length, GLbitfield access,
 510                        struct gl_buffer_object *obj,
 511                        gl_map_buffer_index index)
 512 {
 513    struct pipe_context *pipe = st_context(ctx)->pipe;
 514    struct st_buffer_object *st_obj = st_buffer_object(obj);
 515
 516    assert(offset >= 0);
 517    assert(length >= 0);
 518    assert(offset < obj->Size);
 519    assert(offset + length <= obj->Size);
 520
 521    const enum pipe_transfer_usage transfer_flags =
 522       st_access_flags_to_transfer_flags(access,
 523                                         offset == 0 && length == obj->Size);
 524
 525    obj->Mappings[index].Pointer = pipe_buffer_map_range(pipe,
 526                                                         st_obj->buffer,
 527                                                         offset, length,
 528                                                         transfer_flags,
 529                                                         &st_obj->transfer[index]);
 530    if (obj->Mappings[index].Pointer) {
 531       obj->Mappings[index].Offset = offset;
 532       obj->Mappings[index].Length = length;
 533       obj->Mappings[index].AccessFlags = access;
 534    }
 535    else {
 536       st_obj->transfer[index] = NULL;
 537    }
 538
 539    return obj->Mappings[index].Pointer;
 540 }
 541
 542
 543 static void
 544 st_bufferobj_flush_mapped_range(struct gl_context *ctx,
 545                                 GLintptr offset, GLsizeiptr length,
 546                                 struct gl_buffer_object *obj,
 547                                 gl_map_buffer_index index)
 548 {
 549    struct pipe_context *pipe = st_context(ctx)->pipe;
 550    struct st_buffer_object *st_obj = st_buffer_object(obj);
 551
 552    /* Subrange is relative to mapped range */
 553    assert(offset >= 0);
 554    assert(length >= 0);
 555    assert(offset + length <= obj->Mappings[index].Length);
 556    assert(obj->Mappings[index].Pointer);
 557
 558    if (!length)
 559       return;
 560
 561    pipe_buffer_flush_mapped_range(pipe, st_obj->transfer[index],
 562                                   obj->Mappings[index].Offset + offset,
 563                                   length);
 564 }
 565
 566
 567 /**
 568  * Called via glUnmapBufferARB().
 569  */
 570 static GLboolean
 571 st_bufferobj_unmap(struct gl_context *ctx, struct gl_buffer_object *obj,
 572                    gl_map_buffer_index index)
 573 {
 574    struct pipe_context *pipe = st_context(ctx)->pipe;
 575    struct st_buffer_object *st_obj = st_buffer_object(obj);
 576
 577    if (obj->Mappings[index].Length)
 578       pipe_buffer_unmap(pipe, st_obj->transfer[index]);
 579
 580    st_obj->transfer[index] = NULL;
 581    obj->Mappings[index].Pointer = NULL;
 582    obj->Mappings[index].Offset = 0;
 583    obj->Mappings[index].Length = 0;
 584    return GL_TRUE;
 585 }
 586
 587
 588 /**
 589  * Called via glCopyBufferSubData().
 590  */
 591 static void
 592 st_copy_buffer_subdata(struct gl_context *ctx,
 593                        struct gl_buffer_object *src,
 594                        struct gl_buffer_object *dst,
 595                        GLintptr readOffset, GLintptr writeOffset,
 596                        GLsizeiptr size)
 597 {
 598    struct pipe_context *pipe = st_context(ctx)->pipe;
 599    struct st_buffer_object *srcObj = st_buffer_object(src);
 600    struct st_buffer_object *dstObj = st_buffer_object(dst);
 601    struct pipe_box box;
 602
 603    if (!size)
 604       return;
 605
 606    /* buffer should not already be mapped */
 607    assert(!_mesa_check_disallowed_mapping(src));
 608    /* dst can be mapped, just not the same range as the target range */
 609
 610    u_box_1d(readOffset, size, &box);
 611
 612    pipe->resource_copy_region(pipe, dstObj->buffer, 0, writeOffset, 0, 0,
 613                               srcObj->buffer, 0, &box);
 614 }
 615
 616 /**
 617  * Called via glClearBufferSubData().
 618  */
 619 static void
 620 st_clear_buffer_subdata(struct gl_context *ctx,
 621                         GLintptr offset, GLsizeiptr size,
 622                         const void *clearValue,
 623                         GLsizeiptr clearValueSize,
 624                         struct gl_buffer_object *bufObj)
 625 {
 626    struct pipe_context *pipe = st_context(ctx)->pipe;
 627    struct st_buffer_object *buf = st_buffer_object(bufObj);
 628    static const char zeros[16] = {0};
 629
 630    if (!pipe->clear_buffer) {
 631       _mesa_ClearBufferSubData_sw(ctx, offset, size,
 632                                   clearValue, clearValueSize, bufObj);
 633       return;
 634    }
 635
 636    if (!clearValue)
 637       clearValue = zeros;
 638
 639    pipe->clear_buffer(pipe, buf->buffer, offset, size,
 640                       clearValue, clearValueSize);
 641 }
 642
 643 static void
 644 st_bufferobj_page_commitment(struct gl_context *ctx,
 645                              struct gl_buffer_object *bufferObj,
 646                              GLintptr offset, GLsizeiptr size,
 647                              GLboolean commit)
 648 {
 649    struct pipe_context *pipe = st_context(ctx)->pipe;
 650    struct st_buffer_object *buf = st_buffer_object(bufferObj);
 651    struct pipe_box box;
 652
 653    u_box_1d(offset, size, &box);
 654
 655    if (!pipe->resource_commit(pipe, buf->buffer, 0, &box, commit)) {
 656       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBufferPageCommitmentARB(out of memory)");
 657       return;
 658    }
 659 }
 660
 661 void
 662 st_init_bufferobject_functions(struct pipe_screen *screen,
 663                                struct dd_function_table *functions)
 664 {
 665    functions->NewBufferObject = st_bufferobj_alloc;
 666    functions->DeleteBuffer = st_bufferobj_free;
 667    functions->BufferData = st_bufferobj_data;
 668    functions->BufferDataMem = st_bufferobj_data_mem;
 669    functions->BufferSubData = st_bufferobj_subdata;
 670    functions->GetBufferSubData = st_bufferobj_get_subdata;
 671    functions->MapBufferRange = st_bufferobj_map_range;
 672    functions->FlushMappedBufferRange = st_bufferobj_flush_mapped_range;
 673    functions->UnmapBuffer = st_bufferobj_unmap;
 674    functions->CopyBufferSubData = st_copy_buffer_subdata;
 675    functions->ClearBufferSubData = st_clear_buffer_subdata;
 676    functions->BufferPageCommitment = st_bufferobj_page_commitment;
 677
 678    if (screen->get_param(screen, PIPE_CAP_INVALIDATE_BUFFER))
 679       functions->InvalidateBufferSubData = st_bufferobj_invalidate;
 680 }