src/mesa/main/arrayobj.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  * (C) Copyright IBM Corporation 2006
   6  * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions 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 MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  22  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  23  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  24  * OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 /**
  29  * \file arrayobj.c
  30  *
  31  * Implementation of Vertex Array Objects (VAOs), from OpenGL 3.1+ /
  32  * the GL_ARB_vertex_array_object extension.
  33  *
  34  * \todo
  35  * The code in this file borrows a lot from bufferobj.c.  There's a certain
  36  * amount of cruft left over from that origin that may be unnecessary.
  37  *
  38  * \author Ian Romanick <idr@us.ibm.com>
  39  * \author Brian Paul
  40  */
  41
  42
  43 #include "glheader.h"
  44 #include "hash.h"
  45 #include "image.h"
  46 #include "imports.h"
  47 #include "context.h"
  48 #include "bufferobj.h"
  49 #include "arrayobj.h"
  50 #include "macros.h"
  51 #include "mtypes.h"
  52 #include "state.h"
  53 #include "varray.h"
  54 #include "main/dispatch.h"
  55 #include "util/bitscan.h"
  56 #include "util/u_atomic.h"
  57
  58
  59 const GLubyte
  60 _mesa_vao_attribute_map[ATTRIBUTE_MAP_MODE_MAX][VERT_ATTRIB_MAX] =
  61 {
  62    /* ATTRIBUTE_MAP_MODE_IDENTITY
  63     *
  64     * Grab vertex processing attribute VERT_ATTRIB_POS from
  65     * the VAO attribute VERT_ATTRIB_POS, and grab vertex processing
  66     * attribute VERT_ATTRIB_GENERIC0 from the VAO attribute
  67     * VERT_ATTRIB_GENERIC0.
  68     */
  69    {
  70       VERT_ATTRIB_POS,                 /* VERT_ATTRIB_POS */
  71       VERT_ATTRIB_NORMAL,              /* VERT_ATTRIB_NORMAL */
  72       VERT_ATTRIB_COLOR0,              /* VERT_ATTRIB_COLOR0 */
  73       VERT_ATTRIB_COLOR1,              /* VERT_ATTRIB_COLOR1 */
  74       VERT_ATTRIB_FOG,                 /* VERT_ATTRIB_FOG */
  75       VERT_ATTRIB_COLOR_INDEX,         /* VERT_ATTRIB_COLOR_INDEX */
  76       VERT_ATTRIB_EDGEFLAG,            /* VERT_ATTRIB_EDGEFLAG */
  77       VERT_ATTRIB_TEX0,                /* VERT_ATTRIB_TEX0 */
  78       VERT_ATTRIB_TEX1,                /* VERT_ATTRIB_TEX1 */
  79       VERT_ATTRIB_TEX2,                /* VERT_ATTRIB_TEX2 */
  80       VERT_ATTRIB_TEX3,                /* VERT_ATTRIB_TEX3 */
  81       VERT_ATTRIB_TEX4,                /* VERT_ATTRIB_TEX4 */
  82       VERT_ATTRIB_TEX5,                /* VERT_ATTRIB_TEX5 */
  83       VERT_ATTRIB_TEX6,                /* VERT_ATTRIB_TEX6 */
  84       VERT_ATTRIB_TEX7,                /* VERT_ATTRIB_TEX7 */
  85       VERT_ATTRIB_POINT_SIZE,          /* VERT_ATTRIB_POINT_SIZE */
  86       VERT_ATTRIB_GENERIC0,            /* VERT_ATTRIB_GENERIC0 */
  87       VERT_ATTRIB_GENERIC1,            /* VERT_ATTRIB_GENERIC1 */
  88       VERT_ATTRIB_GENERIC2,            /* VERT_ATTRIB_GENERIC2 */
  89       VERT_ATTRIB_GENERIC3,            /* VERT_ATTRIB_GENERIC3 */
  90       VERT_ATTRIB_GENERIC4,            /* VERT_ATTRIB_GENERIC4 */
  91       VERT_ATTRIB_GENERIC5,            /* VERT_ATTRIB_GENERIC5 */
  92       VERT_ATTRIB_GENERIC6,            /* VERT_ATTRIB_GENERIC6 */
  93       VERT_ATTRIB_GENERIC7,            /* VERT_ATTRIB_GENERIC7 */
  94       VERT_ATTRIB_GENERIC8,            /* VERT_ATTRIB_GENERIC8 */
  95       VERT_ATTRIB_GENERIC9,            /* VERT_ATTRIB_GENERIC9 */
  96       VERT_ATTRIB_GENERIC10,           /* VERT_ATTRIB_GENERIC10 */
  97       VERT_ATTRIB_GENERIC11,           /* VERT_ATTRIB_GENERIC11 */
  98       VERT_ATTRIB_GENERIC12,           /* VERT_ATTRIB_GENERIC12 */
  99       VERT_ATTRIB_GENERIC13,           /* VERT_ATTRIB_GENERIC13 */
 100       VERT_ATTRIB_GENERIC14,           /* VERT_ATTRIB_GENERIC14 */
 101       VERT_ATTRIB_GENERIC15            /* VERT_ATTRIB_GENERIC15 */
 102    },
 103
 104    /* ATTRIBUTE_MAP_MODE_POSITION
 105     *
 106     * Grab vertex processing attribute VERT_ATTRIB_POS as well as
 107     * vertex processing attribute VERT_ATTRIB_GENERIC0 from the
 108     * VAO attribute VERT_ATTRIB_POS.
 109     */
 110    {
 111       VERT_ATTRIB_POS,                 /* VERT_ATTRIB_POS */
 112       VERT_ATTRIB_NORMAL,              /* VERT_ATTRIB_NORMAL */
 113       VERT_ATTRIB_COLOR0,              /* VERT_ATTRIB_COLOR0 */
 114       VERT_ATTRIB_COLOR1,              /* VERT_ATTRIB_COLOR1 */
 115       VERT_ATTRIB_FOG,                 /* VERT_ATTRIB_FOG */
 116       VERT_ATTRIB_COLOR_INDEX,         /* VERT_ATTRIB_COLOR_INDEX */
 117       VERT_ATTRIB_EDGEFLAG,            /* VERT_ATTRIB_EDGEFLAG */
 118       VERT_ATTRIB_TEX0,                /* VERT_ATTRIB_TEX0 */
 119       VERT_ATTRIB_TEX1,                /* VERT_ATTRIB_TEX1 */
 120       VERT_ATTRIB_TEX2,                /* VERT_ATTRIB_TEX2 */
 121       VERT_ATTRIB_TEX3,                /* VERT_ATTRIB_TEX3 */
 122       VERT_ATTRIB_TEX4,                /* VERT_ATTRIB_TEX4 */
 123       VERT_ATTRIB_TEX5,                /* VERT_ATTRIB_TEX5 */
 124       VERT_ATTRIB_TEX6,                /* VERT_ATTRIB_TEX6 */
 125       VERT_ATTRIB_TEX7,                /* VERT_ATTRIB_TEX7 */
 126       VERT_ATTRIB_POINT_SIZE,          /* VERT_ATTRIB_POINT_SIZE */
 127       VERT_ATTRIB_POS,                 /* VERT_ATTRIB_GENERIC0 */
 128       VERT_ATTRIB_GENERIC1,            /* VERT_ATTRIB_GENERIC1 */
 129       VERT_ATTRIB_GENERIC2,            /* VERT_ATTRIB_GENERIC2 */
 130       VERT_ATTRIB_GENERIC3,            /* VERT_ATTRIB_GENERIC3 */
 131       VERT_ATTRIB_GENERIC4,            /* VERT_ATTRIB_GENERIC4 */
 132       VERT_ATTRIB_GENERIC5,            /* VERT_ATTRIB_GENERIC5 */
 133       VERT_ATTRIB_GENERIC6,            /* VERT_ATTRIB_GENERIC6 */
 134       VERT_ATTRIB_GENERIC7,            /* VERT_ATTRIB_GENERIC7 */
 135       VERT_ATTRIB_GENERIC8,            /* VERT_ATTRIB_GENERIC8 */
 136       VERT_ATTRIB_GENERIC9,            /* VERT_ATTRIB_GENERIC9 */
 137       VERT_ATTRIB_GENERIC10,           /* VERT_ATTRIB_GENERIC10 */
 138       VERT_ATTRIB_GENERIC11,           /* VERT_ATTRIB_GENERIC11 */
 139       VERT_ATTRIB_GENERIC12,           /* VERT_ATTRIB_GENERIC12 */
 140       VERT_ATTRIB_GENERIC13,           /* VERT_ATTRIB_GENERIC13 */
 141       VERT_ATTRIB_GENERIC14,           /* VERT_ATTRIB_GENERIC14 */
 142       VERT_ATTRIB_GENERIC15            /* VERT_ATTRIB_GENERIC15 */
 143    },
 144
 145    /* ATTRIBUTE_MAP_MODE_GENERIC0
 146     *
 147     * Grab vertex processing attribute VERT_ATTRIB_POS as well as
 148     * vertex processing attribute VERT_ATTRIB_GENERIC0 from the
 149     * VAO attribute VERT_ATTRIB_GENERIC0.
 150     */
 151    {
 152       VERT_ATTRIB_GENERIC0,            /* VERT_ATTRIB_POS */
 153       VERT_ATTRIB_NORMAL,              /* VERT_ATTRIB_NORMAL */
 154       VERT_ATTRIB_COLOR0,              /* VERT_ATTRIB_COLOR0 */
 155       VERT_ATTRIB_COLOR1,              /* VERT_ATTRIB_COLOR1 */
 156       VERT_ATTRIB_FOG,                 /* VERT_ATTRIB_FOG */
 157       VERT_ATTRIB_COLOR_INDEX,         /* VERT_ATTRIB_COLOR_INDEX */
 158       VERT_ATTRIB_EDGEFLAG,            /* VERT_ATTRIB_EDGEFLAG */
 159       VERT_ATTRIB_TEX0,                /* VERT_ATTRIB_TEX0 */
 160       VERT_ATTRIB_TEX1,                /* VERT_ATTRIB_TEX1 */
 161       VERT_ATTRIB_TEX2,                /* VERT_ATTRIB_TEX2 */
 162       VERT_ATTRIB_TEX3,                /* VERT_ATTRIB_TEX3 */
 163       VERT_ATTRIB_TEX4,                /* VERT_ATTRIB_TEX4 */
 164       VERT_ATTRIB_TEX5,                /* VERT_ATTRIB_TEX5 */
 165       VERT_ATTRIB_TEX6,                /* VERT_ATTRIB_TEX6 */
 166       VERT_ATTRIB_TEX7,                /* VERT_ATTRIB_TEX7 */
 167       VERT_ATTRIB_POINT_SIZE,          /* VERT_ATTRIB_POINT_SIZE */
 168       VERT_ATTRIB_GENERIC0,            /* VERT_ATTRIB_GENERIC0 */
 169       VERT_ATTRIB_GENERIC1,            /* VERT_ATTRIB_GENERIC1 */
 170       VERT_ATTRIB_GENERIC2,            /* VERT_ATTRIB_GENERIC2 */
 171       VERT_ATTRIB_GENERIC3,            /* VERT_ATTRIB_GENERIC3 */
 172       VERT_ATTRIB_GENERIC4,            /* VERT_ATTRIB_GENERIC4 */
 173       VERT_ATTRIB_GENERIC5,            /* VERT_ATTRIB_GENERIC5 */
 174       VERT_ATTRIB_GENERIC6,            /* VERT_ATTRIB_GENERIC6 */
 175       VERT_ATTRIB_GENERIC7,            /* VERT_ATTRIB_GENERIC7 */
 176       VERT_ATTRIB_GENERIC8,            /* VERT_ATTRIB_GENERIC8 */
 177       VERT_ATTRIB_GENERIC9,            /* VERT_ATTRIB_GENERIC9 */
 178       VERT_ATTRIB_GENERIC10,           /* VERT_ATTRIB_GENERIC10 */
 179       VERT_ATTRIB_GENERIC11,           /* VERT_ATTRIB_GENERIC11 */
 180       VERT_ATTRIB_GENERIC12,           /* VERT_ATTRIB_GENERIC12 */
 181       VERT_ATTRIB_GENERIC13,           /* VERT_ATTRIB_GENERIC13 */
 182       VERT_ATTRIB_GENERIC14,           /* VERT_ATTRIB_GENERIC14 */
 183       VERT_ATTRIB_GENERIC15            /* VERT_ATTRIB_GENERIC15 */
 184    }
 185 };
 186
 187
 188 /**
 189  * Look up the array object for the given ID.
 190  *
 191  * \returns
 192  * Either a pointer to the array object with the specified ID or \c NULL for
 193  * a non-existent ID.  The spec defines ID 0 as being technically
 194  * non-existent.
 195  */
 196
 197 struct gl_vertex_array_object *
 198 _mesa_lookup_vao(struct gl_context *ctx, GLuint id)
 199 {
 200    if (id == 0) {
 201       return NULL;
 202    } else {
 203       struct gl_vertex_array_object *vao;
 204
 205       if (ctx->Array.LastLookedUpVAO &&
 206           ctx->Array.LastLookedUpVAO->Name == id) {
 207          vao = ctx->Array.LastLookedUpVAO;
 208       } else {
 209          vao = (struct gl_vertex_array_object *)
 210             _mesa_HashLookupLocked(ctx->Array.Objects, id);
 211
 212          _mesa_reference_vao(ctx, &ctx->Array.LastLookedUpVAO, vao);
 213       }
 214
 215       return vao;
 216    }
 217 }
 218
 219
 220 /**
 221  * Looks up the array object for the given ID.
 222  *
 223  * Unlike _mesa_lookup_vao, this function generates a GL_INVALID_OPERATION
 224  * error if the array object does not exist. It also returns the default
 225  * array object when ctx is a compatibility profile context and id is zero.
 226  */
 227 struct gl_vertex_array_object *
 228 _mesa_lookup_vao_err(struct gl_context *ctx, GLuint id, const char *caller)
 229 {
 230    /* The ARB_direct_state_access specification says:
 231     *
 232     *    "<vaobj> is [compatibility profile:
 233     *     zero, indicating the default vertex array object, or]
 234     *     the name of the vertex array object."
 235     */
 236    if (id == 0) {
 237       if (ctx->API == API_OPENGL_CORE) {
 238          _mesa_error(ctx, GL_INVALID_OPERATION,
 239                      "%s(zero is not valid vaobj name in a core profile "
 240                      "context)", caller);
 241          return NULL;
 242       }
 243
 244       return ctx->Array.DefaultVAO;
 245    } else {
 246       struct gl_vertex_array_object *vao;
 247
 248       if (ctx->Array.LastLookedUpVAO &&
 249           ctx->Array.LastLookedUpVAO->Name == id) {
 250          vao = ctx->Array.LastLookedUpVAO;
 251       } else {
 252          vao = (struct gl_vertex_array_object *)
 253             _mesa_HashLookupLocked(ctx->Array.Objects, id);
 254
 255          /* The ARB_direct_state_access specification says:
 256           *
 257           *    "An INVALID_OPERATION error is generated if <vaobj> is not
 258           *     [compatibility profile: zero or] the name of an existing
 259           *     vertex array object."
 260           */
 261          if (!vao || !vao->EverBound) {
 262             _mesa_error(ctx, GL_INVALID_OPERATION,
 263                         "%s(non-existent vaobj=%u)", caller, id);
 264             return NULL;
 265          }
 266
 267          _mesa_reference_vao(ctx, &ctx->Array.LastLookedUpVAO, vao);
 268       }
 269
 270       return vao;
 271    }
 272 }
 273
 274
 275 /**
 276  * For all the vertex binding points in the array object, unbind any pointers
 277  * to any buffer objects (VBOs).
 278  * This is done just prior to array object destruction.
 279  */
 280 static void
 281 unbind_array_object_vbos(struct gl_context *ctx, struct gl_vertex_array_object *obj)
 282 {
 283    GLuint i;
 284
 285    for (i = 0; i < ARRAY_SIZE(obj->BufferBinding); i++)
 286       _mesa_reference_buffer_object(ctx, &obj->BufferBinding[i].BufferObj, NULL);
 287 }
 288
 289
 290 /**
 291  * Allocate and initialize a new vertex array object.
 292  */
 293 struct gl_vertex_array_object *
 294 _mesa_new_vao(struct gl_context *ctx, GLuint name)
 295 {
 296    struct gl_vertex_array_object *obj = CALLOC_STRUCT(gl_vertex_array_object);
 297    if (obj)
 298       _mesa_initialize_vao(ctx, obj, name);
 299    return obj;
 300 }
 301
 302
 303 /**
 304  * Delete an array object.
 305  */
 306 void
 307 _mesa_delete_vao(struct gl_context *ctx, struct gl_vertex_array_object *obj)
 308 {
 309    unbind_array_object_vbos(ctx, obj);
 310    _mesa_reference_buffer_object(ctx, &obj->IndexBufferObj, NULL);
 311    free(obj->Label);
 312    free(obj);
 313 }
 314
 315
 316 /**
 317  * Set ptr to vao w/ reference counting.
 318  * Note: this should only be called from the _mesa_reference_vao()
 319  * inline function.
 320  */
 321 void
 322 _mesa_reference_vao_(struct gl_context *ctx,
 323                      struct gl_vertex_array_object **ptr,
 324                      struct gl_vertex_array_object *vao)
 325 {
 326    assert(*ptr != vao);
 327
 328    if (*ptr) {
 329       /* Unreference the old array object */
 330       struct gl_vertex_array_object *oldObj = *ptr;
 331
 332       bool deleteFlag;
 333       if (oldObj->SharedAndImmutable) {
 334          deleteFlag = p_atomic_dec_zero(&oldObj->RefCount);
 335       } else {
 336          assert(oldObj->RefCount > 0);
 337          oldObj->RefCount--;
 338          deleteFlag = (oldObj->RefCount == 0);
 339       }
 340
 341       if (deleteFlag)
 342          _mesa_delete_vao(ctx, oldObj);
 343
 344       *ptr = NULL;
 345    }
 346    assert(!*ptr);
 347
 348    if (vao) {
 349       /* reference new array object */
 350       if (vao->SharedAndImmutable) {
 351          p_atomic_inc(&vao->RefCount);
 352       } else {
 353          assert(vao->RefCount > 0);
 354          vao->RefCount++;
 355       }
 356
 357       *ptr = vao;
 358    }
 359 }
 360
 361
 362 /**
 363  * Initialize attributes of a vertex array within a vertex array object.
 364  * \param vao  the container vertex array object
 365  * \param index  which array in the VAO to initialize
 366  * \param size  number of components (1, 2, 3 or 4) per attribute
 367  * \param type  datatype of the attribute (GL_FLOAT, GL_INT, etc).
 368  */
 369 static void
 370 init_array(struct gl_context *ctx,
 371            struct gl_vertex_array_object *vao,
 372            gl_vert_attrib index, GLint size, GLint type)
 373 {
 374    assert(index < ARRAY_SIZE(vao->VertexAttrib));
 375    struct gl_array_attributes *array = &vao->VertexAttrib[index];
 376    assert(index < ARRAY_SIZE(vao->BufferBinding));
 377    struct gl_vertex_buffer_binding *binding = &vao->BufferBinding[index];
 378
 379    array->Size = size;
 380    array->Type = type;
 381    array->Format = GL_RGBA; /* only significant for GL_EXT_vertex_array_bgra */
 382    array->Stride = 0;
 383    array->Ptr = NULL;
 384    array->RelativeOffset = 0;
 385    array->Enabled = GL_FALSE;
 386    array->Normalized = GL_FALSE;
 387    array->Integer = GL_FALSE;
 388    array->Doubles = GL_FALSE;
 389    array->_ElementSize = size * _mesa_sizeof_type(type);
 390    ASSERT_BITFIELD_SIZE(struct gl_array_attributes, BufferBindingIndex,
 391                         VERT_ATTRIB_MAX - 1);
 392    array->BufferBindingIndex = index;
 393
 394    binding->Offset = 0;
 395    binding->Stride = array->_ElementSize;
 396    binding->BufferObj = NULL;
 397    binding->_BoundArrays = BITFIELD_BIT(index);
 398
 399    /* Vertex array buffers */
 400    _mesa_reference_buffer_object(ctx, &binding->BufferObj,
 401                                  ctx->Shared->NullBufferObj);
 402 }
 403
 404
 405 /**
 406  * Initialize a gl_vertex_array_object's arrays.
 407  */
 408 void
 409 _mesa_initialize_vao(struct gl_context *ctx,
 410                      struct gl_vertex_array_object *vao,
 411                      GLuint name)
 412 {
 413    GLuint i;
 414
 415    vao->Name = name;
 416
 417    vao->RefCount = 1;
 418    vao->SharedAndImmutable = false;
 419
 420    /* Init the individual arrays */
 421    for (i = 0; i < ARRAY_SIZE(vao->VertexAttrib); i++) {
 422       switch (i) {
 423       case VERT_ATTRIB_NORMAL:
 424          init_array(ctx, vao, VERT_ATTRIB_NORMAL, 3, GL_FLOAT);
 425          break;
 426       case VERT_ATTRIB_COLOR1:
 427          init_array(ctx, vao, VERT_ATTRIB_COLOR1, 3, GL_FLOAT);
 428          break;
 429       case VERT_ATTRIB_FOG:
 430          init_array(ctx, vao, VERT_ATTRIB_FOG, 1, GL_FLOAT);
 431          break;
 432       case VERT_ATTRIB_COLOR_INDEX:
 433          init_array(ctx, vao, VERT_ATTRIB_COLOR_INDEX, 1, GL_FLOAT);
 434          break;
 435       case VERT_ATTRIB_EDGEFLAG:
 436          init_array(ctx, vao, VERT_ATTRIB_EDGEFLAG, 1, GL_BOOL);
 437          break;
 438       case VERT_ATTRIB_POINT_SIZE:
 439          init_array(ctx, vao, VERT_ATTRIB_POINT_SIZE, 1, GL_FLOAT);
 440          break;
 441       default:
 442          init_array(ctx, vao, i, 4, GL_FLOAT);
 443          break;
 444       }
 445    }
 446
 447    vao->_AttributeMapMode = ATTRIBUTE_MAP_MODE_IDENTITY;
 448
 449    _mesa_reference_buffer_object(ctx, &vao->IndexBufferObj,
 450                                  ctx->Shared->NullBufferObj);
 451 }
 452
 453
 454 /**
 455  * Updates the derived gl_vertex_arrays when a gl_array_attributes
 456  * or a gl_vertex_buffer_binding has changed.
 457  */
 458 void
 459 _mesa_update_vao_derived_arrays(struct gl_context *ctx,
 460                                 struct gl_vertex_array_object *vao)
 461 {
 462    /* Make sure we do not run into problems with shared objects */
 463    assert(!vao->SharedAndImmutable || vao->NewArrays == 0);
 464 }
 465
 466
 467 void
 468 _mesa_set_vao_immutable(struct gl_context *ctx,
 469                         struct gl_vertex_array_object *vao)
 470 {
 471    _mesa_update_vao_derived_arrays(ctx, vao);
 472    vao->NewArrays = 0;
 473    vao->SharedAndImmutable = true;
 474 }
 475
 476
 477 bool
 478 _mesa_all_varyings_in_vbos(const struct gl_vertex_array_object *vao)
 479 {
 480    /* Walk those enabled arrays that have the default vbo attached */
 481    GLbitfield mask = vao->_Enabled & ~vao->VertexAttribBufferMask;
 482
 483    while (mask) {
 484       /* Do not use u_bit_scan64 as we can walk multiple
 485        * attrib arrays at once
 486        */
 487       const int i = ffs(mask) - 1;
 488       const struct gl_array_attributes *attrib_array =
 489          &vao->VertexAttrib[i];
 490       const struct gl_vertex_buffer_binding *buffer_binding =
 491          &vao->BufferBinding[attrib_array->BufferBindingIndex];
 492
 493       /* Only enabled arrays shall appear in the _Enabled bitmask */
 494       assert(attrib_array->Enabled);
 495       /* We have already masked out vao->VertexAttribBufferMask  */
 496       assert(!_mesa_is_bufferobj(buffer_binding->BufferObj));
 497
 498       /* Bail out once we find the first non vbo with a non zero stride */
 499       if (buffer_binding->Stride != 0)
 500          return false;
 501
 502       /* Note that we cannot use the xor variant since the _BoundArray mask
 503        * may contain array attributes that are bound but not enabled.
 504        */
 505       mask &= ~buffer_binding->_BoundArrays;
 506    }
 507
 508    return true;
 509 }
 510
 511 bool
 512 _mesa_all_buffers_are_unmapped(const struct gl_vertex_array_object *vao)
 513 {
 514    /* Walk the enabled arrays that have a vbo attached */
 515    GLbitfield mask = vao->_Enabled & vao->VertexAttribBufferMask;
 516
 517    while (mask) {
 518       const int i = ffs(mask) - 1;
 519       const struct gl_array_attributes *attrib_array =
 520          &vao->VertexAttrib[i];
 521       const struct gl_vertex_buffer_binding *buffer_binding =
 522          &vao->BufferBinding[attrib_array->BufferBindingIndex];
 523
 524       /* Only enabled arrays shall appear in the _Enabled bitmask */
 525       assert(attrib_array->Enabled);
 526       /* We have already masked with vao->VertexAttribBufferMask  */
 527       assert(_mesa_is_bufferobj(buffer_binding->BufferObj));
 528
 529       /* Bail out once we find the first disallowed mapping */
 530       if (_mesa_check_disallowed_mapping(buffer_binding->BufferObj))
 531          return false;
 532
 533       /* We have handled everything that is bound to this buffer_binding. */
 534       mask &= ~buffer_binding->_BoundArrays;
 535    }
 536
 537    return true;
 538 }
 539
 540 /**********************************************************************/
 541 /* API Functions                                                      */
 542 /**********************************************************************/
 543
 544
 545 /**
 546  * ARB version of glBindVertexArray()
 547  */
 548 static ALWAYS_INLINE void
 549 bind_vertex_array(struct gl_context *ctx, GLuint id, bool no_error)
 550 {
 551    struct gl_vertex_array_object *const oldObj = ctx->Array.VAO;
 552    struct gl_vertex_array_object *newObj = NULL;
 553
 554    assert(oldObj != NULL);
 555
 556    if (oldObj->Name == id)
 557       return;   /* rebinding the same array object- no change */
 558
 559    /*
 560     * Get pointer to new array object (newObj)
 561     */
 562    if (id == 0) {
 563       /* The spec says there is no array object named 0, but we use
 564        * one internally because it simplifies things.
 565        */
 566       newObj = ctx->Array.DefaultVAO;
 567    }
 568    else {
 569       /* non-default array object */
 570       newObj = _mesa_lookup_vao(ctx, id);
 571       if (!no_error && !newObj) {
 572          _mesa_error(ctx, GL_INVALID_OPERATION,
 573                      "glBindVertexArray(non-gen name)");
 574          return;
 575       }
 576
 577       newObj->EverBound = GL_TRUE;
 578    }
 579
 580    /* The _DrawArrays pointer is pointing at the VAO being unbound and
 581     * that VAO may be in the process of being deleted. If it's not going
 582     * to be deleted, this will have no effect, because the pointer needs
 583     * to be updated by the VBO module anyway.
 584     *
 585     * Before the VBO module can update the pointer, we have to set it
 586     * to NULL for drivers not to set up arrays which are not bound,
 587     * or to prevent a crash if the VAO being unbound is going to be
 588     * deleted.
 589     */
 590    _mesa_set_drawing_arrays(ctx, NULL);
 591    _mesa_set_draw_vao(ctx, ctx->Array._EmptyVAO, 0);
 592
 593    ctx->NewState |= _NEW_ARRAY;
 594    _mesa_reference_vao(ctx, &ctx->Array.VAO, newObj);
 595 }
 596
 597
 598 void GLAPIENTRY
 599 _mesa_BindVertexArray_no_error(GLuint id)
 600 {
 601    GET_CURRENT_CONTEXT(ctx);
 602    bind_vertex_array(ctx, id, true);
 603 }
 604
 605
 606 void GLAPIENTRY
 607 _mesa_BindVertexArray(GLuint id)
 608 {
 609    GET_CURRENT_CONTEXT(ctx);
 610    bind_vertex_array(ctx, id, false);
 611 }
 612
 613
 614 /**
 615  * Delete a set of array objects.
 616  *
 617  * \param n      Number of array objects to delete.
 618  * \param ids    Array of \c n array object IDs.
 619  */
 620 static void
 621 delete_vertex_arrays(struct gl_context *ctx, GLsizei n, const GLuint *ids)
 622 {
 623    GLsizei i;
 624
 625    for (i = 0; i < n; i++) {
 626       struct gl_vertex_array_object *obj = _mesa_lookup_vao(ctx, ids[i]);
 627
 628       if (obj) {
 629          assert(obj->Name == ids[i]);
 630
 631          /* If the array object is currently bound, the spec says "the binding
 632           * for that object reverts to zero and the default vertex array
 633           * becomes current."
 634           */
 635          if (obj == ctx->Array.VAO)
 636             _mesa_BindVertexArray_no_error(0);
 637
 638          /* The ID is immediately freed for re-use */
 639          _mesa_HashRemoveLocked(ctx->Array.Objects, obj->Name);
 640
 641          if (ctx->Array.LastLookedUpVAO == obj)
 642             _mesa_reference_vao(ctx, &ctx->Array.LastLookedUpVAO, NULL);
 643          if (ctx->Array._DrawVAO == obj)
 644             _mesa_set_draw_vao(ctx, ctx->Array._EmptyVAO, 0);
 645
 646          /* Unreference the array object.
 647           * If refcount hits zero, the object will be deleted.
 648           */
 649          _mesa_reference_vao(ctx, &obj, NULL);
 650       }
 651    }
 652 }
 653
 654
 655 void GLAPIENTRY
 656 _mesa_DeleteVertexArrays_no_error(GLsizei n, const GLuint *ids)
 657 {
 658    GET_CURRENT_CONTEXT(ctx);
 659    delete_vertex_arrays(ctx, n, ids);
 660 }
 661
 662
 663 void GLAPIENTRY
 664 _mesa_DeleteVertexArrays(GLsizei n, const GLuint *ids)
 665 {
 666    GET_CURRENT_CONTEXT(ctx);
 667
 668    if (n < 0) {
 669       _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteVertexArray(n)");
 670       return;
 671    }
 672
 673    delete_vertex_arrays(ctx, n, ids);
 674 }
 675
 676
 677 /**
 678  * Generate a set of unique array object IDs and store them in \c arrays.
 679  * Helper for _mesa_GenVertexArrays() and _mesa_CreateVertexArrays()
 680  * below.
 681  *
 682  * \param n       Number of IDs to generate.
 683  * \param arrays  Array of \c n locations to store the IDs.
 684  * \param create  Indicates that the objects should also be created.
 685  * \param func    The name of the GL entry point.
 686  */
 687 static void
 688 gen_vertex_arrays(struct gl_context *ctx, GLsizei n, GLuint *arrays,
 689                   bool create, const char *func)
 690 {
 691    GLuint first;
 692    GLint i;
 693
 694    if (!arrays)
 695       return;
 696
 697    first = _mesa_HashFindFreeKeyBlock(ctx->Array.Objects, n);
 698
 699    /* For the sake of simplicity we create the array objects in both
 700     * the Gen* and Create* cases.  The only difference is the value of
 701     * EverBound, which is set to true in the Create* case.
 702     */
 703    for (i = 0; i < n; i++) {
 704       struct gl_vertex_array_object *obj;
 705       GLuint name = first + i;
 706
 707       obj = _mesa_new_vao(ctx, name);
 708       if (!obj) {
 709          _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s", func);
 710          return;
 711       }
 712       obj->EverBound = create;
 713       _mesa_HashInsertLocked(ctx->Array.Objects, obj->Name, obj);
 714       arrays[i] = first + i;
 715    }
 716 }
 717
 718
 719 static void
 720 gen_vertex_arrays_err(struct gl_context *ctx, GLsizei n, GLuint *arrays,
 721                       bool create, const char *func)
 722 {
 723    if (n < 0) {
 724       _mesa_error(ctx, GL_INVALID_VALUE, "%s(n < 0)", func);
 725       return;
 726    }
 727
 728    gen_vertex_arrays(ctx, n, arrays, create, func);
 729 }
 730
 731
 732 /**
 733  * ARB version of glGenVertexArrays()
 734  * All arrays will be required to live in VBOs.
 735  */
 736 void GLAPIENTRY
 737 _mesa_GenVertexArrays_no_error(GLsizei n, GLuint *arrays)
 738 {
 739    GET_CURRENT_CONTEXT(ctx);
 740    gen_vertex_arrays(ctx, n, arrays, false, "glGenVertexArrays");
 741 }
 742
 743
 744 void GLAPIENTRY
 745 _mesa_GenVertexArrays(GLsizei n, GLuint *arrays)
 746 {
 747    GET_CURRENT_CONTEXT(ctx);
 748    gen_vertex_arrays_err(ctx, n, arrays, false, "glGenVertexArrays");
 749 }
 750
 751
 752 /**
 753  * ARB_direct_state_access
 754  * Generates ID's and creates the array objects.
 755  */
 756 void GLAPIENTRY
 757 _mesa_CreateVertexArrays_no_error(GLsizei n, GLuint *arrays)
 758 {
 759    GET_CURRENT_CONTEXT(ctx);
 760    gen_vertex_arrays(ctx, n, arrays, true, "glCreateVertexArrays");
 761 }
 762
 763
 764 void GLAPIENTRY
 765 _mesa_CreateVertexArrays(GLsizei n, GLuint *arrays)
 766 {
 767    GET_CURRENT_CONTEXT(ctx);
 768    gen_vertex_arrays_err(ctx, n, arrays, true, "glCreateVertexArrays");
 769 }
 770
 771
 772 /**
 773  * Determine if ID is the name of an array object.
 774  *
 775  * \param id  ID of the potential array object.
 776  * \return  \c GL_TRUE if \c id is the name of a array object,
 777  *          \c GL_FALSE otherwise.
 778  */
 779 GLboolean GLAPIENTRY
 780 _mesa_IsVertexArray( GLuint id )
 781 {
 782    struct gl_vertex_array_object * obj;
 783    GET_CURRENT_CONTEXT(ctx);
 784    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 785
 786    obj = _mesa_lookup_vao(ctx, id);
 787
 788    return obj != NULL && obj->EverBound;
 789 }
 790
 791
 792 /**
 793  * Sets the element array buffer binding of a vertex array object.
 794  *
 795  * This is the ARB_direct_state_access equivalent of
 796  * glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffer).
 797  */
 798 static ALWAYS_INLINE void
 799 vertex_array_element_buffer(struct gl_context *ctx, GLuint vaobj, GLuint buffer,
 800                             bool no_error)
 801 {
 802    struct gl_vertex_array_object *vao;
 803    struct gl_buffer_object *bufObj;
 804
 805    ASSERT_OUTSIDE_BEGIN_END(ctx);
 806
 807    if (!no_error) {
 808       /* The GL_ARB_direct_state_access specification says:
 809        *
 810        *    "An INVALID_OPERATION error is generated by
 811        *     VertexArrayElementBuffer if <vaobj> is not [compatibility profile:
 812        *     zero or] the name of an existing vertex array object."
 813        */
 814       vao =_mesa_lookup_vao_err(ctx, vaobj, "glVertexArrayElementBuffer");
 815       if (!vao)
 816          return;
 817    } else {
 818       vao = _mesa_lookup_vao(ctx, vaobj);
 819    }
 820
 821    if (buffer != 0) {
 822       if (!no_error) {
 823          /* The GL_ARB_direct_state_access specification says:
 824           *
 825           *    "An INVALID_OPERATION error is generated if <buffer> is not zero
 826           *     or the name of an existing buffer object."
 827           */
 828          bufObj = _mesa_lookup_bufferobj_err(ctx, buffer,
 829                                              "glVertexArrayElementBuffer");
 830       } else {
 831          bufObj = _mesa_lookup_bufferobj(ctx, buffer);
 832       }
 833    } else {
 834       bufObj = ctx->Shared->NullBufferObj;
 835    }
 836
 837    if (bufObj)
 838       _mesa_reference_buffer_object(ctx, &vao->IndexBufferObj, bufObj);
 839 }
 840
 841
 842 void GLAPIENTRY
 843 _mesa_VertexArrayElementBuffer_no_error(GLuint vaobj, GLuint buffer)
 844 {
 845    GET_CURRENT_CONTEXT(ctx);
 846    vertex_array_element_buffer(ctx, vaobj, buffer, true);
 847 }
 848
 849
 850 void GLAPIENTRY
 851 _mesa_VertexArrayElementBuffer(GLuint vaobj, GLuint buffer)
 852 {
 853    GET_CURRENT_CONTEXT(ctx);
 854    vertex_array_element_buffer(ctx, vaobj, buffer, false);
 855 }
 856
 857
 858 void GLAPIENTRY
 859 _mesa_GetVertexArrayiv(GLuint vaobj, GLenum pname, GLint *param)
 860 {
 861    GET_CURRENT_CONTEXT(ctx);
 862    struct gl_vertex_array_object *vao;
 863
 864    ASSERT_OUTSIDE_BEGIN_END(ctx);
 865
 866    /* The GL_ARB_direct_state_access specification says:
 867     *
 868     *   "An INVALID_OPERATION error is generated if <vaobj> is not
 869     *    [compatibility profile: zero or] the name of an existing
 870     *    vertex array object."
 871     */
 872    vao =_mesa_lookup_vao_err(ctx, vaobj, "glGetVertexArrayiv");
 873    if (!vao)
 874       return;
 875
 876    /* The GL_ARB_direct_state_access specification says:
 877     *
 878     *   "An INVALID_ENUM error is generated if <pname> is not
 879     *    ELEMENT_ARRAY_BUFFER_BINDING."
 880     */
 881    if (pname != GL_ELEMENT_ARRAY_BUFFER_BINDING) {
 882       _mesa_error(ctx, GL_INVALID_ENUM,
 883                   "glGetVertexArrayiv(pname != "
 884                   "GL_ELEMENT_ARRAY_BUFFER_BINDING)");
 885       return;
 886    }
 887
 888    param[0] = vao->IndexBufferObj->Name;
 889 }