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 "util/bitscan.h"
  55 #include "util/u_atomic.h"
  56
  57
  58 const GLubyte
  59 _mesa_vao_attribute_map[ATTRIBUTE_MAP_MODE_MAX][VERT_ATTRIB_MAX] =
  60 {
  61    /* ATTRIBUTE_MAP_MODE_IDENTITY
  62     *
  63     * Grab vertex processing attribute VERT_ATTRIB_POS from
  64     * the VAO attribute VERT_ATTRIB_POS, and grab vertex processing
  65     * attribute VERT_ATTRIB_GENERIC0 from the VAO attribute
  66     * VERT_ATTRIB_GENERIC0.
  67     */
  68    {
  69       VERT_ATTRIB_POS,                 /* VERT_ATTRIB_POS */
  70       VERT_ATTRIB_NORMAL,              /* VERT_ATTRIB_NORMAL */
  71       VERT_ATTRIB_COLOR0,              /* VERT_ATTRIB_COLOR0 */
  72       VERT_ATTRIB_COLOR1,              /* VERT_ATTRIB_COLOR1 */
  73       VERT_ATTRIB_FOG,                 /* VERT_ATTRIB_FOG */
  74       VERT_ATTRIB_COLOR_INDEX,         /* VERT_ATTRIB_COLOR_INDEX */
  75       VERT_ATTRIB_EDGEFLAG,            /* VERT_ATTRIB_EDGEFLAG */
  76       VERT_ATTRIB_TEX0,                /* VERT_ATTRIB_TEX0 */
  77       VERT_ATTRIB_TEX1,                /* VERT_ATTRIB_TEX1 */
  78       VERT_ATTRIB_TEX2,                /* VERT_ATTRIB_TEX2 */
  79       VERT_ATTRIB_TEX3,                /* VERT_ATTRIB_TEX3 */
  80       VERT_ATTRIB_TEX4,                /* VERT_ATTRIB_TEX4 */
  81       VERT_ATTRIB_TEX5,                /* VERT_ATTRIB_TEX5 */
  82       VERT_ATTRIB_TEX6,                /* VERT_ATTRIB_TEX6 */
  83       VERT_ATTRIB_TEX7,                /* VERT_ATTRIB_TEX7 */
  84       VERT_ATTRIB_POINT_SIZE,          /* VERT_ATTRIB_POINT_SIZE */
  85       VERT_ATTRIB_GENERIC0,            /* VERT_ATTRIB_GENERIC0 */
  86       VERT_ATTRIB_GENERIC1,            /* VERT_ATTRIB_GENERIC1 */
  87       VERT_ATTRIB_GENERIC2,            /* VERT_ATTRIB_GENERIC2 */
  88       VERT_ATTRIB_GENERIC3,            /* VERT_ATTRIB_GENERIC3 */
  89       VERT_ATTRIB_GENERIC4,            /* VERT_ATTRIB_GENERIC4 */
  90       VERT_ATTRIB_GENERIC5,            /* VERT_ATTRIB_GENERIC5 */
  91       VERT_ATTRIB_GENERIC6,            /* VERT_ATTRIB_GENERIC6 */
  92       VERT_ATTRIB_GENERIC7,            /* VERT_ATTRIB_GENERIC7 */
  93       VERT_ATTRIB_GENERIC8,            /* VERT_ATTRIB_GENERIC8 */
  94       VERT_ATTRIB_GENERIC9,            /* VERT_ATTRIB_GENERIC9 */
  95       VERT_ATTRIB_GENERIC10,           /* VERT_ATTRIB_GENERIC10 */
  96       VERT_ATTRIB_GENERIC11,           /* VERT_ATTRIB_GENERIC11 */
  97       VERT_ATTRIB_GENERIC12,           /* VERT_ATTRIB_GENERIC12 */
  98       VERT_ATTRIB_GENERIC13,           /* VERT_ATTRIB_GENERIC13 */
  99       VERT_ATTRIB_GENERIC14,           /* VERT_ATTRIB_GENERIC14 */
 100       VERT_ATTRIB_GENERIC15            /* VERT_ATTRIB_GENERIC15 */
 101    },
 102
 103    /* ATTRIBUTE_MAP_MODE_POSITION
 104     *
 105     * Grab vertex processing attribute VERT_ATTRIB_POS as well as
 106     * vertex processing attribute VERT_ATTRIB_GENERIC0 from the
 107     * VAO attribute VERT_ATTRIB_POS.
 108     */
 109    {
 110       VERT_ATTRIB_POS,                 /* VERT_ATTRIB_POS */
 111       VERT_ATTRIB_NORMAL,              /* VERT_ATTRIB_NORMAL */
 112       VERT_ATTRIB_COLOR0,              /* VERT_ATTRIB_COLOR0 */
 113       VERT_ATTRIB_COLOR1,              /* VERT_ATTRIB_COLOR1 */
 114       VERT_ATTRIB_FOG,                 /* VERT_ATTRIB_FOG */
 115       VERT_ATTRIB_COLOR_INDEX,         /* VERT_ATTRIB_COLOR_INDEX */
 116       VERT_ATTRIB_EDGEFLAG,            /* VERT_ATTRIB_EDGEFLAG */
 117       VERT_ATTRIB_TEX0,                /* VERT_ATTRIB_TEX0 */
 118       VERT_ATTRIB_TEX1,                /* VERT_ATTRIB_TEX1 */
 119       VERT_ATTRIB_TEX2,                /* VERT_ATTRIB_TEX2 */
 120       VERT_ATTRIB_TEX3,                /* VERT_ATTRIB_TEX3 */
 121       VERT_ATTRIB_TEX4,                /* VERT_ATTRIB_TEX4 */
 122       VERT_ATTRIB_TEX5,                /* VERT_ATTRIB_TEX5 */
 123       VERT_ATTRIB_TEX6,                /* VERT_ATTRIB_TEX6 */
 124       VERT_ATTRIB_TEX7,                /* VERT_ATTRIB_TEX7 */
 125       VERT_ATTRIB_POINT_SIZE,          /* VERT_ATTRIB_POINT_SIZE */
 126       VERT_ATTRIB_POS,                 /* VERT_ATTRIB_GENERIC0 */
 127       VERT_ATTRIB_GENERIC1,            /* VERT_ATTRIB_GENERIC1 */
 128       VERT_ATTRIB_GENERIC2,            /* VERT_ATTRIB_GENERIC2 */
 129       VERT_ATTRIB_GENERIC3,            /* VERT_ATTRIB_GENERIC3 */
 130       VERT_ATTRIB_GENERIC4,            /* VERT_ATTRIB_GENERIC4 */
 131       VERT_ATTRIB_GENERIC5,            /* VERT_ATTRIB_GENERIC5 */
 132       VERT_ATTRIB_GENERIC6,            /* VERT_ATTRIB_GENERIC6 */
 133       VERT_ATTRIB_GENERIC7,            /* VERT_ATTRIB_GENERIC7 */
 134       VERT_ATTRIB_GENERIC8,            /* VERT_ATTRIB_GENERIC8 */
 135       VERT_ATTRIB_GENERIC9,            /* VERT_ATTRIB_GENERIC9 */
 136       VERT_ATTRIB_GENERIC10,           /* VERT_ATTRIB_GENERIC10 */
 137       VERT_ATTRIB_GENERIC11,           /* VERT_ATTRIB_GENERIC11 */
 138       VERT_ATTRIB_GENERIC12,           /* VERT_ATTRIB_GENERIC12 */
 139       VERT_ATTRIB_GENERIC13,           /* VERT_ATTRIB_GENERIC13 */
 140       VERT_ATTRIB_GENERIC14,           /* VERT_ATTRIB_GENERIC14 */
 141       VERT_ATTRIB_GENERIC15            /* VERT_ATTRIB_GENERIC15 */
 142    },
 143
 144    /* ATTRIBUTE_MAP_MODE_GENERIC0
 145     *
 146     * Grab vertex processing attribute VERT_ATTRIB_POS as well as
 147     * vertex processing attribute VERT_ATTRIB_GENERIC0 from the
 148     * VAO attribute VERT_ATTRIB_GENERIC0.
 149     */
 150    {
 151       VERT_ATTRIB_GENERIC0,            /* VERT_ATTRIB_POS */
 152       VERT_ATTRIB_NORMAL,              /* VERT_ATTRIB_NORMAL */
 153       VERT_ATTRIB_COLOR0,              /* VERT_ATTRIB_COLOR0 */
 154       VERT_ATTRIB_COLOR1,              /* VERT_ATTRIB_COLOR1 */
 155       VERT_ATTRIB_FOG,                 /* VERT_ATTRIB_FOG */
 156       VERT_ATTRIB_COLOR_INDEX,         /* VERT_ATTRIB_COLOR_INDEX */
 157       VERT_ATTRIB_EDGEFLAG,            /* VERT_ATTRIB_EDGEFLAG */
 158       VERT_ATTRIB_TEX0,                /* VERT_ATTRIB_TEX0 */
 159       VERT_ATTRIB_TEX1,                /* VERT_ATTRIB_TEX1 */
 160       VERT_ATTRIB_TEX2,                /* VERT_ATTRIB_TEX2 */
 161       VERT_ATTRIB_TEX3,                /* VERT_ATTRIB_TEX3 */
 162       VERT_ATTRIB_TEX4,                /* VERT_ATTRIB_TEX4 */
 163       VERT_ATTRIB_TEX5,                /* VERT_ATTRIB_TEX5 */
 164       VERT_ATTRIB_TEX6,                /* VERT_ATTRIB_TEX6 */
 165       VERT_ATTRIB_TEX7,                /* VERT_ATTRIB_TEX7 */
 166       VERT_ATTRIB_POINT_SIZE,          /* VERT_ATTRIB_POINT_SIZE */
 167       VERT_ATTRIB_GENERIC0,            /* VERT_ATTRIB_GENERIC0 */
 168       VERT_ATTRIB_GENERIC1,            /* VERT_ATTRIB_GENERIC1 */
 169       VERT_ATTRIB_GENERIC2,            /* VERT_ATTRIB_GENERIC2 */
 170       VERT_ATTRIB_GENERIC3,            /* VERT_ATTRIB_GENERIC3 */
 171       VERT_ATTRIB_GENERIC4,            /* VERT_ATTRIB_GENERIC4 */
 172       VERT_ATTRIB_GENERIC5,            /* VERT_ATTRIB_GENERIC5 */
 173       VERT_ATTRIB_GENERIC6,            /* VERT_ATTRIB_GENERIC6 */
 174       VERT_ATTRIB_GENERIC7,            /* VERT_ATTRIB_GENERIC7 */
 175       VERT_ATTRIB_GENERIC8,            /* VERT_ATTRIB_GENERIC8 */
 176       VERT_ATTRIB_GENERIC9,            /* VERT_ATTRIB_GENERIC9 */
 177       VERT_ATTRIB_GENERIC10,           /* VERT_ATTRIB_GENERIC10 */
 178       VERT_ATTRIB_GENERIC11,           /* VERT_ATTRIB_GENERIC11 */
 179       VERT_ATTRIB_GENERIC12,           /* VERT_ATTRIB_GENERIC12 */
 180       VERT_ATTRIB_GENERIC13,           /* VERT_ATTRIB_GENERIC13 */
 181       VERT_ATTRIB_GENERIC14,           /* VERT_ATTRIB_GENERIC14 */
 182       VERT_ATTRIB_GENERIC15            /* VERT_ATTRIB_GENERIC15 */
 183    }
 184 };
 185
 186
 187 /**
 188  * Look up the array object for the given ID.
 189  *
 190  * \returns
 191  * Either a pointer to the array object with the specified ID or \c NULL for
 192  * a non-existent ID.  The spec defines ID 0 as being technically
 193  * non-existent.
 194  */
 195
 196 struct gl_vertex_array_object *
 197 _mesa_lookup_vao(struct gl_context *ctx, GLuint id)
 198 {
 199    if (id == 0) {
 200       return NULL;
 201    } else {
 202       struct gl_vertex_array_object *vao;
 203
 204       if (ctx->Array.LastLookedUpVAO &&
 205           ctx->Array.LastLookedUpVAO->Name == id) {
 206          vao = ctx->Array.LastLookedUpVAO;
 207       } else {
 208          vao = (struct gl_vertex_array_object *)
 209             _mesa_HashLookupLocked(ctx->Array.Objects, id);
 210
 211          _mesa_reference_vao(ctx, &ctx->Array.LastLookedUpVAO, vao);
 212       }
 213
 214       return vao;
 215    }
 216 }
 217
 218
 219 /**
 220  * Looks up the array object for the given ID.
 221  *
 222  * Unlike _mesa_lookup_vao, this function generates a GL_INVALID_OPERATION
 223  * error if the array object does not exist. It also returns the default
 224  * array object when ctx is a compatibility profile context and id is zero.
 225  */
 226 struct gl_vertex_array_object *
 227 _mesa_lookup_vao_err(struct gl_context *ctx, GLuint id, const char *caller)
 228 {
 229    /* The ARB_direct_state_access specification says:
 230     *
 231     *    "<vaobj> is [compatibility profile:
 232     *     zero, indicating the default vertex array object, or]
 233     *     the name of the vertex array object."
 234     */
 235    if (id == 0) {
 236       if (ctx->API == API_OPENGL_CORE) {
 237          _mesa_error(ctx, GL_INVALID_OPERATION,
 238                      "%s(zero is not valid vaobj name in a core profile "
 239                      "context)", caller);
 240          return NULL;
 241       }
 242
 243       return ctx->Array.DefaultVAO;
 244    } else {
 245       struct gl_vertex_array_object *vao;
 246
 247       if (ctx->Array.LastLookedUpVAO &&
 248           ctx->Array.LastLookedUpVAO->Name == id) {
 249          vao = ctx->Array.LastLookedUpVAO;
 250       } else {
 251          vao = (struct gl_vertex_array_object *)
 252             _mesa_HashLookupLocked(ctx->Array.Objects, id);
 253
 254          /* The ARB_direct_state_access specification says:
 255           *
 256           *    "An INVALID_OPERATION error is generated if <vaobj> is not
 257           *     [compatibility profile: zero or] the name of an existing
 258           *     vertex array object."
 259           */
 260          if (!vao || !vao->EverBound) {
 261             _mesa_error(ctx, GL_INVALID_OPERATION,
 262                         "%s(non-existent vaobj=%u)", caller, id);
 263             return NULL;
 264          }
 265
 266          _mesa_reference_vao(ctx, &ctx->Array.LastLookedUpVAO, vao);
 267       }
 268
 269       return vao;
 270    }
 271 }
 272
 273
 274 /**
 275  * For all the vertex binding points in the array object, unbind any pointers
 276  * to any buffer objects (VBOs).
 277  * This is done just prior to array object destruction.
 278  */
 279 static void
 280 unbind_array_object_vbos(struct gl_context *ctx, struct gl_vertex_array_object *obj)
 281 {
 282    GLuint i;
 283
 284    for (i = 0; i < ARRAY_SIZE(obj->BufferBinding); i++)
 285       _mesa_reference_buffer_object(ctx, &obj->BufferBinding[i].BufferObj, NULL);
 286 }
 287
 288
 289 /**
 290  * Allocate and initialize a new vertex array object.
 291  */
 292 struct gl_vertex_array_object *
 293 _mesa_new_vao(struct gl_context *ctx, GLuint name)
 294 {
 295    struct gl_vertex_array_object *obj = CALLOC_STRUCT(gl_vertex_array_object);
 296    if (obj)
 297       _mesa_initialize_vao(ctx, obj, name);
 298    return obj;
 299 }
 300
 301
 302 /**
 303  * Delete an array object.
 304  */
 305 void
 306 _mesa_delete_vao(struct gl_context *ctx, struct gl_vertex_array_object *obj)
 307 {
 308    unbind_array_object_vbos(ctx, obj);
 309    _mesa_reference_buffer_object(ctx, &obj->IndexBufferObj, NULL);
 310    free(obj->Label);
 311    free(obj);
 312 }
 313
 314
 315 /**
 316  * Set ptr to vao w/ reference counting.
 317  * Note: this should only be called from the _mesa_reference_vao()
 318  * inline function.
 319  */
 320 void
 321 _mesa_reference_vao_(struct gl_context *ctx,
 322                      struct gl_vertex_array_object **ptr,
 323                      struct gl_vertex_array_object *vao)
 324 {
 325    assert(*ptr != vao);
 326
 327    if (*ptr) {
 328       /* Unreference the old array object */
 329       struct gl_vertex_array_object *oldObj = *ptr;
 330
 331       bool deleteFlag;
 332       if (oldObj->SharedAndImmutable) {
 333          deleteFlag = p_atomic_dec_zero(&oldObj->RefCount);
 334       } else {
 335          assert(oldObj->RefCount > 0);
 336          oldObj->RefCount--;
 337          deleteFlag = (oldObj->RefCount == 0);
 338       }
 339
 340       if (deleteFlag)
 341          _mesa_delete_vao(ctx, oldObj);
 342
 343       *ptr = NULL;
 344    }
 345    assert(!*ptr);
 346
 347    if (vao) {
 348       /* reference new array object */
 349       if (vao->SharedAndImmutable) {
 350          p_atomic_inc(&vao->RefCount);
 351       } else {
 352          assert(vao->RefCount > 0);
 353          vao->RefCount++;
 354       }
 355
 356       *ptr = vao;
 357    }
 358 }
 359
 360
 361 /**
 362  * Initialize attributes of a vertex array within a vertex array object.
 363  * \param vao  the container vertex array object
 364  * \param index  which array in the VAO to initialize
 365  * \param size  number of components (1, 2, 3 or 4) per attribute
 366  * \param type  datatype of the attribute (GL_FLOAT, GL_INT, etc).
 367  */
 368 static void
 369 init_array(struct gl_context *ctx,
 370            struct gl_vertex_array_object *vao,
 371            gl_vert_attrib index, GLint size, GLint type)
 372 {
 373    assert(index < ARRAY_SIZE(vao->VertexAttrib));
 374    struct gl_array_attributes *array = &vao->VertexAttrib[index];
 375    assert(index < ARRAY_SIZE(vao->BufferBinding));
 376    struct gl_vertex_buffer_binding *binding = &vao->BufferBinding[index];
 377
 378    array->Size = size;
 379    array->Type = type;
 380    array->Format = GL_RGBA; /* only significant for GL_EXT_vertex_array_bgra */
 381    array->Stride = 0;
 382    array->Ptr = NULL;
 383    array->RelativeOffset = 0;
 384    array->Enabled = GL_FALSE;
 385    array->Normalized = GL_FALSE;
 386    array->Integer = GL_FALSE;
 387    array->Doubles = GL_FALSE;
 388    array->_ElementSize = size * _mesa_sizeof_type(type);
 389    ASSERT_BITFIELD_SIZE(struct gl_array_attributes, BufferBindingIndex,
 390                         VERT_ATTRIB_MAX - 1);
 391    array->BufferBindingIndex = index;
 392
 393    binding->Offset = 0;
 394    binding->Stride = array->_ElementSize;
 395    binding->BufferObj = NULL;
 396    binding->_BoundArrays = BITFIELD_BIT(index);
 397
 398    /* Vertex array buffers */
 399    _mesa_reference_buffer_object(ctx, &binding->BufferObj,
 400                                  ctx->Shared->NullBufferObj);
 401 }
 402
 403
 404 /**
 405  * Initialize a gl_vertex_array_object's arrays.
 406  */
 407 void
 408 _mesa_initialize_vao(struct gl_context *ctx,
 409                      struct gl_vertex_array_object *vao,
 410                      GLuint name)
 411 {
 412    GLuint i;
 413
 414    vao->Name = name;
 415
 416    vao->RefCount = 1;
 417    vao->SharedAndImmutable = false;
 418
 419    /* Init the individual arrays */
 420    for (i = 0; i < ARRAY_SIZE(vao->VertexAttrib); i++) {
 421       switch (i) {
 422       case VERT_ATTRIB_NORMAL:
 423          init_array(ctx, vao, VERT_ATTRIB_NORMAL, 3, GL_FLOAT);
 424          break;
 425       case VERT_ATTRIB_COLOR1:
 426          init_array(ctx, vao, VERT_ATTRIB_COLOR1, 3, GL_FLOAT);
 427          break;
 428       case VERT_ATTRIB_FOG:
 429          init_array(ctx, vao, VERT_ATTRIB_FOG, 1, GL_FLOAT);
 430          break;
 431       case VERT_ATTRIB_COLOR_INDEX:
 432          init_array(ctx, vao, VERT_ATTRIB_COLOR_INDEX, 1, GL_FLOAT);
 433          break;
 434       case VERT_ATTRIB_EDGEFLAG:
 435          init_array(ctx, vao, VERT_ATTRIB_EDGEFLAG, 1, GL_BOOL);
 436          break;
 437       case VERT_ATTRIB_POINT_SIZE:
 438          init_array(ctx, vao, VERT_ATTRIB_POINT_SIZE, 1, GL_FLOAT);
 439          break;
 440       default:
 441          init_array(ctx, vao, i, 4, GL_FLOAT);
 442          break;
 443       }
 444    }
 445
 446    vao->_AttributeMapMode = ATTRIBUTE_MAP_MODE_IDENTITY;
 447
 448    _mesa_reference_buffer_object(ctx, &vao->IndexBufferObj,
 449                                  ctx->Shared->NullBufferObj);
 450 }
 451
 452
 453 /**
 454  * Updates the derived gl_vertex_arrays when a gl_array_attributes
 455  * or a gl_vertex_buffer_binding has changed.
 456  */
 457 void
 458 _mesa_update_vao_derived_arrays(struct gl_context *ctx,
 459                                 struct gl_vertex_array_object *vao)
 460 {
 461    /* Make sure we do not run into problems with shared objects */
 462    assert(!vao->SharedAndImmutable || vao->NewArrays == 0);
 463
 464    /*
 465     * Stay tuned, the next series scans for duplicate bindings in this
 466     * function. So that drivers can easily know the minimum unique set
 467     * of bindings.
 468     */
 469 }
 470
 471
 472 void
 473 _mesa_set_vao_immutable(struct gl_context *ctx,
 474                         struct gl_vertex_array_object *vao)
 475 {
 476    _mesa_update_vao_derived_arrays(ctx, vao);
 477    vao->NewArrays = 0;
 478    vao->SharedAndImmutable = true;
 479 }
 480
 481
 482 bool
 483 _mesa_all_varyings_in_vbos(const struct gl_vertex_array_object *vao)
 484 {
 485    /* Walk those enabled arrays that have the default vbo attached */
 486    GLbitfield mask = vao->_Enabled & ~vao->VertexAttribBufferMask;
 487
 488    while (mask) {
 489       /* Do not use u_bit_scan64 as we can walk multiple
 490        * attrib arrays at once
 491        */
 492       const int i = ffs(mask) - 1;
 493       const struct gl_array_attributes *attrib_array =
 494          &vao->VertexAttrib[i];
 495       const struct gl_vertex_buffer_binding *buffer_binding =
 496          &vao->BufferBinding[attrib_array->BufferBindingIndex];
 497
 498       /* Only enabled arrays shall appear in the _Enabled bitmask */
 499       assert(attrib_array->Enabled);
 500       /* We have already masked out vao->VertexAttribBufferMask  */
 501       assert(!_mesa_is_bufferobj(buffer_binding->BufferObj));
 502
 503       /* Bail out once we find the first non vbo with a non zero stride */
 504       if (buffer_binding->Stride != 0)
 505          return false;
 506
 507       /* Note that we cannot use the xor variant since the _BoundArray mask
 508        * may contain array attributes that are bound but not enabled.
 509        */
 510       mask &= ~buffer_binding->_BoundArrays;
 511    }
 512
 513    return true;
 514 }
 515
 516 bool
 517 _mesa_all_buffers_are_unmapped(const struct gl_vertex_array_object *vao)
 518 {
 519    /* Walk the enabled arrays that have a vbo attached */
 520    GLbitfield mask = vao->_Enabled & vao->VertexAttribBufferMask;
 521
 522    while (mask) {
 523       const int i = ffs(mask) - 1;
 524       const struct gl_array_attributes *attrib_array =
 525          &vao->VertexAttrib[i];
 526       const struct gl_vertex_buffer_binding *buffer_binding =
 527          &vao->BufferBinding[attrib_array->BufferBindingIndex];
 528
 529       /* Only enabled arrays shall appear in the _Enabled bitmask */
 530       assert(attrib_array->Enabled);
 531       /* We have already masked with vao->VertexAttribBufferMask  */
 532       assert(_mesa_is_bufferobj(buffer_binding->BufferObj));
 533
 534       /* Bail out once we find the first disallowed mapping */
 535       if (_mesa_check_disallowed_mapping(buffer_binding->BufferObj))
 536          return false;
 537
 538       /* We have handled everything that is bound to this buffer_binding. */
 539       mask &= ~buffer_binding->_BoundArrays;
 540    }
 541
 542    return true;
 543 }
 544
 545 /**********************************************************************/
 546 /* API Functions                                                      */
 547 /**********************************************************************/
 548
 549
 550 /**
 551  * ARB version of glBindVertexArray()
 552  */
 553 static ALWAYS_INLINE void
 554 bind_vertex_array(struct gl_context *ctx, GLuint id, bool no_error)
 555 {
 556    struct gl_vertex_array_object *const oldObj = ctx->Array.VAO;
 557    struct gl_vertex_array_object *newObj = NULL;
 558
 559    assert(oldObj != NULL);
 560
 561    if (oldObj->Name == id)
 562       return;   /* rebinding the same array object- no change */
 563
 564    /*
 565     * Get pointer to new array object (newObj)
 566     */
 567    if (id == 0) {
 568       /* The spec says there is no array object named 0, but we use
 569        * one internally because it simplifies things.
 570        */
 571       newObj = ctx->Array.DefaultVAO;
 572    }
 573    else {
 574       /* non-default array object */
 575       newObj = _mesa_lookup_vao(ctx, id);
 576       if (!no_error && !newObj) {
 577          _mesa_error(ctx, GL_INVALID_OPERATION,
 578                      "glBindVertexArray(non-gen name)");
 579          return;
 580       }
 581
 582       newObj->EverBound = GL_TRUE;
 583    }
 584
 585    /* The _DrawArrays pointer is pointing at the VAO being unbound and
 586     * that VAO may be in the process of being deleted. If it's not going
 587     * to be deleted, this will have no effect, because the pointer needs
 588     * to be updated by the VBO module anyway.
 589     *
 590     * Before the VBO module can update the pointer, we have to set it
 591     * to NULL for drivers not to set up arrays which are not bound,
 592     * or to prevent a crash if the VAO being unbound is going to be
 593     * deleted.
 594     */
 595    _mesa_set_drawing_arrays(ctx, NULL);
 596    _mesa_set_draw_vao(ctx, ctx->Array._EmptyVAO, 0);
 597
 598    ctx->NewState |= _NEW_ARRAY;
 599    _mesa_reference_vao(ctx, &ctx->Array.VAO, newObj);
 600 }
 601
 602
 603 void GLAPIENTRY
 604 _mesa_BindVertexArray_no_error(GLuint id)
 605 {
 606    GET_CURRENT_CONTEXT(ctx);
 607    bind_vertex_array(ctx, id, true);
 608 }
 609
 610
 611 void GLAPIENTRY
 612 _mesa_BindVertexArray(GLuint id)
 613 {
 614    GET_CURRENT_CONTEXT(ctx);
 615    bind_vertex_array(ctx, id, false);
 616 }
 617
 618
 619 /**
 620  * Delete a set of array objects.
 621  *
 622  * \param n      Number of array objects to delete.
 623  * \param ids    Array of \c n array object IDs.
 624  */
 625 static void
 626 delete_vertex_arrays(struct gl_context *ctx, GLsizei n, const GLuint *ids)
 627 {
 628    GLsizei i;
 629
 630    for (i = 0; i < n; i++) {
 631       struct gl_vertex_array_object *obj = _mesa_lookup_vao(ctx, ids[i]);
 632
 633       if (obj) {
 634          assert(obj->Name == ids[i]);
 635
 636          /* If the array object is currently bound, the spec says "the binding
 637           * for that object reverts to zero and the default vertex array
 638           * becomes current."
 639           */
 640          if (obj == ctx->Array.VAO)
 641             _mesa_BindVertexArray_no_error(0);
 642
 643          /* The ID is immediately freed for re-use */
 644          _mesa_HashRemoveLocked(ctx->Array.Objects, obj->Name);
 645
 646          if (ctx->Array.LastLookedUpVAO == obj)
 647             _mesa_reference_vao(ctx, &ctx->Array.LastLookedUpVAO, NULL);
 648          if (ctx->Array._DrawVAO == obj)
 649             _mesa_set_draw_vao(ctx, ctx->Array._EmptyVAO, 0);
 650
 651          /* Unreference the array object.
 652           * If refcount hits zero, the object will be deleted.
 653           */
 654          _mesa_reference_vao(ctx, &obj, NULL);
 655       }
 656    }
 657 }
 658
 659
 660 void GLAPIENTRY
 661 _mesa_DeleteVertexArrays_no_error(GLsizei n, const GLuint *ids)
 662 {
 663    GET_CURRENT_CONTEXT(ctx);
 664    delete_vertex_arrays(ctx, n, ids);
 665 }
 666
 667
 668 void GLAPIENTRY
 669 _mesa_DeleteVertexArrays(GLsizei n, const GLuint *ids)
 670 {
 671    GET_CURRENT_CONTEXT(ctx);
 672
 673    if (n < 0) {
 674       _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteVertexArray(n)");
 675       return;
 676    }
 677
 678    delete_vertex_arrays(ctx, n, ids);
 679 }
 680
 681
 682 /**
 683  * Generate a set of unique array object IDs and store them in \c arrays.
 684  * Helper for _mesa_GenVertexArrays() and _mesa_CreateVertexArrays()
 685  * below.
 686  *
 687  * \param n       Number of IDs to generate.
 688  * \param arrays  Array of \c n locations to store the IDs.
 689  * \param create  Indicates that the objects should also be created.
 690  * \param func    The name of the GL entry point.
 691  */
 692 static void
 693 gen_vertex_arrays(struct gl_context *ctx, GLsizei n, GLuint *arrays,
 694                   bool create, const char *func)
 695 {
 696    GLuint first;
 697    GLint i;
 698
 699    if (!arrays)
 700       return;
 701
 702    first = _mesa_HashFindFreeKeyBlock(ctx->Array.Objects, n);
 703
 704    /* For the sake of simplicity we create the array objects in both
 705     * the Gen* and Create* cases.  The only difference is the value of
 706     * EverBound, which is set to true in the Create* case.
 707     */
 708    for (i = 0; i < n; i++) {
 709       struct gl_vertex_array_object *obj;
 710       GLuint name = first + i;
 711
 712       obj = _mesa_new_vao(ctx, name);
 713       if (!obj) {
 714          _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s", func);
 715          return;
 716       }
 717       obj->EverBound = create;
 718       _mesa_HashInsertLocked(ctx->Array.Objects, obj->Name, obj);
 719       arrays[i] = first + i;
 720    }
 721 }
 722
 723
 724 static void
 725 gen_vertex_arrays_err(struct gl_context *ctx, GLsizei n, GLuint *arrays,
 726                       bool create, const char *func)
 727 {
 728    if (n < 0) {
 729       _mesa_error(ctx, GL_INVALID_VALUE, "%s(n < 0)", func);
 730       return;
 731    }
 732
 733    gen_vertex_arrays(ctx, n, arrays, create, func);
 734 }
 735
 736
 737 /**
 738  * ARB version of glGenVertexArrays()
 739  * All arrays will be required to live in VBOs.
 740  */
 741 void GLAPIENTRY
 742 _mesa_GenVertexArrays_no_error(GLsizei n, GLuint *arrays)
 743 {
 744    GET_CURRENT_CONTEXT(ctx);
 745    gen_vertex_arrays(ctx, n, arrays, false, "glGenVertexArrays");
 746 }
 747
 748
 749 void GLAPIENTRY
 750 _mesa_GenVertexArrays(GLsizei n, GLuint *arrays)
 751 {
 752    GET_CURRENT_CONTEXT(ctx);
 753    gen_vertex_arrays_err(ctx, n, arrays, false, "glGenVertexArrays");
 754 }
 755
 756
 757 /**
 758  * ARB_direct_state_access
 759  * Generates ID's and creates the array objects.
 760  */
 761 void GLAPIENTRY
 762 _mesa_CreateVertexArrays_no_error(GLsizei n, GLuint *arrays)
 763 {
 764    GET_CURRENT_CONTEXT(ctx);
 765    gen_vertex_arrays(ctx, n, arrays, true, "glCreateVertexArrays");
 766 }
 767
 768
 769 void GLAPIENTRY
 770 _mesa_CreateVertexArrays(GLsizei n, GLuint *arrays)
 771 {
 772    GET_CURRENT_CONTEXT(ctx);
 773    gen_vertex_arrays_err(ctx, n, arrays, true, "glCreateVertexArrays");
 774 }
 775
 776
 777 /**
 778  * Determine if ID is the name of an array object.
 779  *
 780  * \param id  ID of the potential array object.
 781  * \return  \c GL_TRUE if \c id is the name of a array object,
 782  *          \c GL_FALSE otherwise.
 783  */
 784 GLboolean GLAPIENTRY
 785 _mesa_IsVertexArray( GLuint id )
 786 {
 787    struct gl_vertex_array_object * obj;
 788    GET_CURRENT_CONTEXT(ctx);
 789    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 790
 791    obj = _mesa_lookup_vao(ctx, id);
 792
 793    return obj != NULL && obj->EverBound;
 794 }
 795
 796
 797 /**
 798  * Sets the element array buffer binding of a vertex array object.
 799  *
 800  * This is the ARB_direct_state_access equivalent of
 801  * glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffer).
 802  */
 803 static ALWAYS_INLINE void
 804 vertex_array_element_buffer(struct gl_context *ctx, GLuint vaobj, GLuint buffer,
 805                             bool no_error)
 806 {
 807    struct gl_vertex_array_object *vao;
 808    struct gl_buffer_object *bufObj;
 809
 810    ASSERT_OUTSIDE_BEGIN_END(ctx);
 811
 812    if (!no_error) {
 813       /* The GL_ARB_direct_state_access specification says:
 814        *
 815        *    "An INVALID_OPERATION error is generated by
 816        *     VertexArrayElementBuffer if <vaobj> is not [compatibility profile:
 817        *     zero or] the name of an existing vertex array object."
 818        */
 819       vao =_mesa_lookup_vao_err(ctx, vaobj, "glVertexArrayElementBuffer");
 820       if (!vao)
 821          return;
 822    } else {
 823       vao = _mesa_lookup_vao(ctx, vaobj);
 824    }
 825
 826    if (buffer != 0) {
 827       if (!no_error) {
 828          /* The GL_ARB_direct_state_access specification says:
 829           *
 830           *    "An INVALID_OPERATION error is generated if <buffer> is not zero
 831           *     or the name of an existing buffer object."
 832           */
 833          bufObj = _mesa_lookup_bufferobj_err(ctx, buffer,
 834                                              "glVertexArrayElementBuffer");
 835       } else {
 836          bufObj = _mesa_lookup_bufferobj(ctx, buffer);
 837       }
 838    } else {
 839       bufObj = ctx->Shared->NullBufferObj;
 840    }
 841
 842    if (bufObj)
 843       _mesa_reference_buffer_object(ctx, &vao->IndexBufferObj, bufObj);
 844 }
 845
 846
 847 void GLAPIENTRY
 848 _mesa_VertexArrayElementBuffer_no_error(GLuint vaobj, GLuint buffer)
 849 {
 850    GET_CURRENT_CONTEXT(ctx);
 851    vertex_array_element_buffer(ctx, vaobj, buffer, true);
 852 }
 853
 854
 855 void GLAPIENTRY
 856 _mesa_VertexArrayElementBuffer(GLuint vaobj, GLuint buffer)
 857 {
 858    GET_CURRENT_CONTEXT(ctx);
 859    vertex_array_element_buffer(ctx, vaobj, buffer, false);
 860 }
 861
 862
 863 void GLAPIENTRY
 864 _mesa_GetVertexArrayiv(GLuint vaobj, GLenum pname, GLint *param)
 865 {
 866    GET_CURRENT_CONTEXT(ctx);
 867    struct gl_vertex_array_object *vao;
 868
 869    ASSERT_OUTSIDE_BEGIN_END(ctx);
 870
 871    /* The GL_ARB_direct_state_access specification says:
 872     *
 873     *   "An INVALID_OPERATION error is generated if <vaobj> is not
 874     *    [compatibility profile: zero or] the name of an existing
 875     *    vertex array object."
 876     */
 877    vao =_mesa_lookup_vao_err(ctx, vaobj, "glGetVertexArrayiv");
 878    if (!vao)
 879       return;
 880
 881    /* The GL_ARB_direct_state_access specification says:
 882     *
 883     *   "An INVALID_ENUM error is generated if <pname> is not
 884     *    ELEMENT_ARRAY_BUFFER_BINDING."
 885     */
 886    if (pname != GL_ELEMENT_ARRAY_BUFFER_BINDING) {
 887       _mesa_error(ctx, GL_INVALID_ENUM,
 888                   "glGetVertexArrayiv(pname != "
 889                   "GL_ELEMENT_ARRAY_BUFFER_BINDING)");
 890       return;
 891    }
 892
 893    param[0] = vao->IndexBufferObj->Name;
 894 }