src/mesa/main/arrayobj.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.6
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  * (C) Copyright IBM Corporation 2006
   7  * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL OR IBM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  23  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
  24  * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  25  * SOFTWARE.
  26  */
  27
  28
  29 /**
  30  * \file arrayobj.c
  31  * Functions for the GL_APPLE_vertex_array_object extension.
  32  *
  33  * \todo
  34  * The code in this file borrows a lot from bufferobj.c.  There's a certain
  35  * amount of cruft left over from that origin that may be unnecessary.
  36  *
  37  * \author Ian Romanick <idr@us.ibm.com>
  38  * \author Brian Paul
  39  */
  40
  41
  42 #include "glheader.h"
  43 #include "hash.h"
  44 #include "image.h"
  45 #include "imports.h"
  46 #include "context.h"
  47 #include "mfeatures.h"
  48 #if FEATURE_ARB_vertex_buffer_object
  49 #include "bufferobj.h"
  50 #endif
  51 #include "arrayobj.h"
  52 #include "macros.h"
  53 #include "mtypes.h"
  54 #include "varray.h"
  55 #include "main/dispatch.h"
  56
  57
  58 /**
  59  * Look up the array object for the given ID.
  60  *
  61  * \returns
  62  * Either a pointer to the array object with the specified ID or \c NULL for
  63  * a non-existent ID.  The spec defines ID 0 as being technically
  64  * non-existent.
  65  */
  66
  67 static inline struct gl_array_object *
  68 lookup_arrayobj(struct gl_context *ctx, GLuint id)
  69 {
  70    if (id == 0)
  71       return NULL;
  72    else
  73       return (struct gl_array_object *)
  74          _mesa_HashLookup(ctx->Array.Objects, id);
  75 }
  76
  77
  78 /**
  79  * For all the vertex arrays in the array object, unbind any pointers
  80  * to any buffer objects (VBOs).
  81  * This is done just prior to array object destruction.
  82  */
  83 static void
  84 unbind_array_object_vbos(struct gl_context *ctx, struct gl_array_object *obj)
  85 {
  86    GLuint i;
  87
  88    _mesa_reference_buffer_object(ctx, &obj->Vertex.BufferObj, NULL);
  89    _mesa_reference_buffer_object(ctx, &obj->Weight.BufferObj, NULL);
  90    _mesa_reference_buffer_object(ctx, &obj->Normal.BufferObj, NULL);
  91    _mesa_reference_buffer_object(ctx, &obj->Color.BufferObj, NULL);
  92    _mesa_reference_buffer_object(ctx, &obj->SecondaryColor.BufferObj, NULL);
  93    _mesa_reference_buffer_object(ctx, &obj->FogCoord.BufferObj, NULL);
  94    _mesa_reference_buffer_object(ctx, &obj->Index.BufferObj, NULL);
  95    _mesa_reference_buffer_object(ctx, &obj->EdgeFlag.BufferObj, NULL);
  96
  97    for (i = 0; i < Elements(obj->TexCoord); i++)
  98       _mesa_reference_buffer_object(ctx, &obj->TexCoord[i].BufferObj, NULL);
  99
 100    for (i = 0; i < Elements(obj->VertexAttrib); i++)
 101       _mesa_reference_buffer_object(ctx, &obj->VertexAttrib[i].BufferObj,NULL);
 102
 103 #if FEATURE_point_size_array
 104    _mesa_reference_buffer_object(ctx, &obj->PointSize.BufferObj, NULL);
 105 #endif
 106 }
 107
 108
 109 /**
 110  * Allocate and initialize a new vertex array object.
 111  *
 112  * This function is intended to be called via
 113  * \c dd_function_table::NewArrayObject.
 114  */
 115 struct gl_array_object *
 116 _mesa_new_array_object( struct gl_context *ctx, GLuint name )
 117 {
 118    struct gl_array_object *obj = CALLOC_STRUCT(gl_array_object);
 119    if (obj)
 120       _mesa_initialize_array_object(ctx, obj, name);
 121    return obj;
 122 }
 123
 124
 125 /**
 126  * Delete an array object.
 127  *
 128  * This function is intended to be called via
 129  * \c dd_function_table::DeleteArrayObject.
 130  */
 131 void
 132 _mesa_delete_array_object( struct gl_context *ctx, struct gl_array_object *obj )
 133 {
 134    (void) ctx;
 135    unbind_array_object_vbos(ctx, obj);
 136    _glthread_DESTROY_MUTEX(obj->Mutex);
 137    free(obj);
 138 }
 139
 140
 141 /**
 142  * Set ptr to arrayObj w/ reference counting.
 143  */
 144 void
 145 _mesa_reference_array_object(struct gl_context *ctx,
 146                              struct gl_array_object **ptr,
 147                              struct gl_array_object *arrayObj)
 148 {
 149    if (*ptr == arrayObj)
 150       return;
 151
 152    if (*ptr) {
 153       /* Unreference the old array object */
 154       GLboolean deleteFlag = GL_FALSE;
 155       struct gl_array_object *oldObj = *ptr;
 156
 157       _glthread_LOCK_MUTEX(oldObj->Mutex);
 158       ASSERT(oldObj->RefCount > 0);
 159       oldObj->RefCount--;
 160 #if 0
 161       printf("ArrayObj %p %d DECR to %d\n",
 162              (void *) oldObj, oldObj->Name, oldObj->RefCount);
 163 #endif
 164       deleteFlag = (oldObj->RefCount == 0);
 165       _glthread_UNLOCK_MUTEX(oldObj->Mutex);
 166
 167       if (deleteFlag) {
 168          ASSERT(ctx->Driver.DeleteArrayObject);
 169          ctx->Driver.DeleteArrayObject(ctx, oldObj);
 170       }
 171
 172       *ptr = NULL;
 173    }
 174    ASSERT(!*ptr);
 175
 176    if (arrayObj) {
 177       /* reference new array object */
 178       _glthread_LOCK_MUTEX(arrayObj->Mutex);
 179       if (arrayObj->RefCount == 0) {
 180          /* this array's being deleted (look just above) */
 181          /* Not sure this can every really happen.  Warn if it does. */
 182          _mesa_problem(NULL, "referencing deleted array object");
 183          *ptr = NULL;
 184       }
 185       else {
 186          arrayObj->RefCount++;
 187 #if 0
 188          printf("ArrayObj %p %d INCR to %d\n",
 189                 (void *) arrayObj, arrayObj->Name, arrayObj->RefCount);
 190 #endif
 191          *ptr = arrayObj;
 192       }
 193       _glthread_UNLOCK_MUTEX(arrayObj->Mutex);
 194    }
 195 }
 196
 197
 198
 199 static void
 200 init_array(struct gl_context *ctx,
 201            struct gl_client_array *array, GLint size, GLint type)
 202 {
 203    array->Size = size;
 204    array->Type = type;
 205    array->Format = GL_RGBA; /* only significant for GL_EXT_vertex_array_bgra */
 206    array->Stride = 0;
 207    array->StrideB = 0;
 208    array->Ptr = NULL;
 209    array->Enabled = GL_FALSE;
 210    array->Normalized = GL_FALSE;
 211    array->Integer = GL_FALSE;
 212    array->_ElementSize = size * _mesa_sizeof_type(type);
 213 #if FEATURE_ARB_vertex_buffer_object
 214    /* Vertex array buffers */
 215    _mesa_reference_buffer_object(ctx, &array->BufferObj,
 216                                  ctx->Shared->NullBufferObj);
 217 #endif
 218 }
 219
 220
 221 /**
 222  * Initialize a gl_array_object's arrays.
 223  */
 224 void
 225 _mesa_initialize_array_object( struct gl_context *ctx,
 226                                struct gl_array_object *obj,
 227                                GLuint name )
 228 {
 229    GLuint i;
 230
 231    obj->Name = name;
 232
 233    _glthread_INIT_MUTEX(obj->Mutex);
 234    obj->RefCount = 1;
 235
 236    /* Init the individual arrays */
 237    init_array(ctx, &obj->Vertex, 4, GL_FLOAT);
 238    init_array(ctx, &obj->Weight, 1, GL_FLOAT);
 239    init_array(ctx, &obj->Normal, 3, GL_FLOAT);
 240    init_array(ctx, &obj->Color, 4, GL_FLOAT);
 241    init_array(ctx, &obj->SecondaryColor, 3, GL_FLOAT);
 242    init_array(ctx, &obj->FogCoord, 1, GL_FLOAT);
 243    init_array(ctx, &obj->Index, 1, GL_FLOAT);
 244    for (i = 0; i < Elements(obj->TexCoord); i++) {
 245       init_array(ctx, &obj->TexCoord[i], 4, GL_FLOAT);
 246    }
 247    init_array(ctx, &obj->EdgeFlag, 1, GL_BOOL);
 248    for (i = 0; i < Elements(obj->VertexAttrib); i++) {
 249       init_array(ctx, &obj->VertexAttrib[i], 4, GL_FLOAT);
 250    }
 251
 252 #if FEATURE_point_size_array
 253    init_array(ctx, &obj->PointSize, 1, GL_FLOAT);
 254 #endif
 255 }
 256
 257
 258 /**
 259  * Add the given array object to the array object pool.
 260  */
 261 static void
 262 save_array_object( struct gl_context *ctx, struct gl_array_object *obj )
 263 {
 264    if (obj->Name > 0) {
 265       /* insert into hash table */
 266       _mesa_HashInsert(ctx->Array.Objects, obj->Name, obj);
 267    }
 268 }
 269
 270
 271 /**
 272  * Remove the given array object from the array object pool.
 273  * Do not deallocate the array object though.
 274  */
 275 static void
 276 remove_array_object( struct gl_context *ctx, struct gl_array_object *obj )
 277 {
 278    if (obj->Name > 0) {
 279       /* remove from hash table */
 280       _mesa_HashRemove(ctx->Array.Objects, obj->Name);
 281    }
 282 }
 283
 284
 285
 286 /**
 287  * Helper for update_arrays().
 288  * \return  min(current min, array->_MaxElement).
 289  */
 290 static GLuint
 291 update_min(GLuint min, struct gl_client_array *array)
 292 {
 293    if (array->Enabled) {
 294       _mesa_update_array_max_element(array);
 295       return MIN2(min, array->_MaxElement);
 296    }
 297    else
 298       return min;
 299 }
 300
 301
 302 /**
 303  * Examine vertex arrays to update the gl_array_object::_MaxElement field.
 304  */
 305 void
 306 _mesa_update_array_object_max_element(struct gl_context *ctx,
 307                                       struct gl_array_object *arrayObj)
 308 {
 309    GLuint i, min = ~0;
 310
 311    min = update_min(min, &arrayObj->Vertex);
 312    min = update_min(min, &arrayObj->Weight);
 313    min = update_min(min, &arrayObj->Normal);
 314    min = update_min(min, &arrayObj->Color);
 315    min = update_min(min, &arrayObj->SecondaryColor);
 316    min = update_min(min, &arrayObj->FogCoord);
 317    min = update_min(min, &arrayObj->Index);
 318    min = update_min(min, &arrayObj->EdgeFlag);
 319 #if FEATURE_point_size_array
 320    min = update_min(min, &arrayObj->PointSize);
 321 #endif
 322    for (i = 0; i < ctx->Const.MaxTextureCoordUnits; i++)
 323       min = update_min(min, &arrayObj->TexCoord[i]);
 324    for (i = 0; i < Elements(arrayObj->VertexAttrib); i++)
 325       min = update_min(min, &arrayObj->VertexAttrib[i]);
 326
 327    /* _MaxElement is one past the last legal array element */
 328    arrayObj->_MaxElement = min;
 329 }
 330
 331
 332 /**********************************************************************/
 333 /* API Functions                                                      */
 334 /**********************************************************************/
 335
 336
 337 /**
 338  * Helper for _mesa_BindVertexArray() and _mesa_BindVertexArrayAPPLE().
 339  * \param genRequired  specifies behavour when id was not generated with
 340  *                     glGenVertexArrays().
 341  */
 342 static void
 343 bind_vertex_array(struct gl_context *ctx, GLuint id, GLboolean genRequired)
 344 {
 345    struct gl_array_object * const oldObj = ctx->Array.ArrayObj;
 346    struct gl_array_object *newObj = NULL;
 347    ASSERT_OUTSIDE_BEGIN_END(ctx);
 348
 349    ASSERT(oldObj != NULL);
 350
 351    if ( oldObj->Name == id )
 352       return;   /* rebinding the same array object- no change */
 353
 354    /*
 355     * Get pointer to new array object (newObj)
 356     */
 357    if (id == 0) {
 358       /* The spec says there is no array object named 0, but we use
 359        * one internally because it simplifies things.
 360        */
 361       newObj = ctx->Array.DefaultArrayObj;
 362    }
 363    else {
 364       /* non-default array object */
 365       newObj = lookup_arrayobj(ctx, id);
 366       if (!newObj) {
 367          if (genRequired) {
 368             _mesa_error(ctx, GL_INVALID_OPERATION, "glBindVertexArray(id)");
 369             return;
 370          }
 371
 372          /* For APPLE version, generate a new array object now */
 373          newObj = (*ctx->Driver.NewArrayObject)(ctx, id);
 374          if (!newObj) {
 375             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindVertexArrayAPPLE");
 376             return;
 377          }
 378          save_array_object(ctx, newObj);
 379       }
 380    }
 381
 382    ctx->NewState |= _NEW_ARRAY;
 383    ctx->Array.NewState |= _NEW_ARRAY_ALL;
 384    _mesa_reference_array_object(ctx, &ctx->Array.ArrayObj, newObj);
 385
 386    /* Pass BindVertexArray call to device driver */
 387    if (ctx->Driver.BindArrayObject && newObj)
 388       ctx->Driver.BindArrayObject(ctx, newObj);
 389 }
 390
 391
 392 /**
 393  * ARB version of glBindVertexArray()
 394  * This function behaves differently from glBindVertexArrayAPPLE() in
 395  * that this function requires all ids to have been previously generated
 396  * by glGenVertexArrays[APPLE]().
 397  */
 398 void GLAPIENTRY
 399 _mesa_BindVertexArray( GLuint id )
 400 {
 401    GET_CURRENT_CONTEXT(ctx);
 402    bind_vertex_array(ctx, id, GL_TRUE);
 403 }
 404
 405
 406 /**
 407  * Bind a new array.
 408  *
 409  * \todo
 410  * The binding could be done more efficiently by comparing the non-NULL
 411  * pointers in the old and new objects.  The only arrays that are "dirty" are
 412  * the ones that are non-NULL in either object.
 413  */
 414 void GLAPIENTRY
 415 _mesa_BindVertexArrayAPPLE( GLuint id )
 416 {
 417    GET_CURRENT_CONTEXT(ctx);
 418    bind_vertex_array(ctx, id, GL_FALSE);
 419 }
 420
 421
 422 /**
 423  * Delete a set of array objects.
 424  *
 425  * \param n      Number of array objects to delete.
 426  * \param ids    Array of \c n array object IDs.
 427  */
 428 void GLAPIENTRY
 429 _mesa_DeleteVertexArraysAPPLE(GLsizei n, const GLuint *ids)
 430 {
 431    GET_CURRENT_CONTEXT(ctx);
 432    GLsizei i;
 433    ASSERT_OUTSIDE_BEGIN_END(ctx);
 434
 435    if (n < 0) {
 436       _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteVertexArrayAPPLE(n)");
 437       return;
 438    }
 439
 440    for (i = 0; i < n; i++) {
 441       struct gl_array_object *obj = lookup_arrayobj(ctx, ids[i]);
 442
 443       if ( obj != NULL ) {
 444          ASSERT( obj->Name == ids[i] );
 445
 446          /* If the array object is currently bound, the spec says "the binding
 447           * for that object reverts to zero and the default vertex array
 448           * becomes current."
 449           */
 450          if ( obj == ctx->Array.ArrayObj ) {
 451             CALL_BindVertexArrayAPPLE( ctx->Exec, (0) );
 452          }
 453
 454          /* The ID is immediately freed for re-use */
 455          remove_array_object(ctx, obj);
 456
 457          /* Unreference the array object.
 458           * If refcount hits zero, the object will be deleted.
 459           */
 460          _mesa_reference_array_object(ctx, &obj, NULL);
 461       }
 462    }
 463 }
 464
 465
 466 /**
 467  * Generate a set of unique array object IDs and store them in \c arrays.
 468  * Helper for _mesa_GenVertexArrays[APPLE]() functions below.
 469  * \param n       Number of IDs to generate.
 470  * \param arrays  Array of \c n locations to store the IDs.
 471  * \param vboOnly Will arrays have to reside in VBOs?
 472  */
 473 static void
 474 gen_vertex_arrays(struct gl_context *ctx, GLsizei n, GLuint *arrays,
 475                   GLboolean vboOnly)
 476 {
 477    GLuint first;
 478    GLint i;
 479    ASSERT_OUTSIDE_BEGIN_END(ctx);
 480
 481    if (n < 0) {
 482       _mesa_error(ctx, GL_INVALID_VALUE, "glGenVertexArraysAPPLE");
 483       return;
 484    }
 485
 486    if (!arrays) {
 487       return;
 488    }
 489
 490    first = _mesa_HashFindFreeKeyBlock(ctx->Array.Objects, n);
 491
 492    /* Allocate new, empty array objects and return identifiers */
 493    for (i = 0; i < n; i++) {
 494       struct gl_array_object *obj;
 495       GLuint name = first + i;
 496
 497       obj = (*ctx->Driver.NewArrayObject)( ctx, name );
 498       if (!obj) {
 499          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGenVertexArraysAPPLE");
 500          return;
 501       }
 502       obj->VBOonly = vboOnly;
 503       save_array_object(ctx, obj);
 504       arrays[i] = first + i;
 505    }
 506 }
 507
 508
 509 /**
 510  * ARB version of glGenVertexArrays()
 511  * All arrays will be required to live in VBOs.
 512  */
 513 void GLAPIENTRY
 514 _mesa_GenVertexArrays(GLsizei n, GLuint *arrays)
 515 {
 516    GET_CURRENT_CONTEXT(ctx);
 517    gen_vertex_arrays(ctx, n, arrays, GL_TRUE);
 518 }
 519
 520
 521 /**
 522  * APPLE version of glGenVertexArraysAPPLE()
 523  * Arrays may live in VBOs or ordinary memory.
 524  */
 525 void GLAPIENTRY
 526 _mesa_GenVertexArraysAPPLE(GLsizei n, GLuint *arrays)
 527 {
 528    GET_CURRENT_CONTEXT(ctx);
 529    gen_vertex_arrays(ctx, n, arrays, GL_FALSE);
 530 }
 531
 532
 533 /**
 534  * Determine if ID is the name of an array object.
 535  *
 536  * \param id  ID of the potential array object.
 537  * \return  \c GL_TRUE if \c id is the name of a array object,
 538  *          \c GL_FALSE otherwise.
 539  */
 540 GLboolean GLAPIENTRY
 541 _mesa_IsVertexArrayAPPLE( GLuint id )
 542 {
 543    struct gl_array_object * obj;
 544    GET_CURRENT_CONTEXT(ctx);
 545    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 546
 547    if (id == 0)
 548       return GL_FALSE;
 549
 550    obj = lookup_arrayobj(ctx, id);
 551
 552    return (obj != NULL) ? GL_TRUE : GL_FALSE;
 553 }