src/mesa/main/transformfeedback.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 2010  VMware, Inc.  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 "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /*
  27  * Transform feedback support.
  28  *
  29  * Authors:
  30  *   Brian Paul
  31  */
  32
  33
  34 #include "buffers.h"
  35 #include "context.h"
  36 #include "hash.h"
  37 #include "macros.h"
  38 #include "mtypes.h"
  39 #include "transformfeedback.h"
  40 #include "shaderapi.h"
  41 #include "shaderobj.h"
  42 #include "main/dispatch.h"
  43
  44 #include "program/prog_parameter.h"
  45
  46 struct using_program_tuple
  47 {
  48    struct gl_program *prog;
  49    bool found;
  50 };
  51
  52 static void
  53 active_xfb_object_references_program(GLuint key, void *data, void *user_data)
  54 {
  55    struct using_program_tuple *callback_data = user_data;
  56    struct gl_transform_feedback_object *obj = data;
  57    if (obj->Active && obj->program == callback_data->prog)
  58       callback_data->found = true;
  59 }
  60
  61 /**
  62  * Return true if any active transform feedback object is using a program.
  63  */
  64 bool
  65 _mesa_transform_feedback_is_using_program(struct gl_context *ctx,
  66                                           struct gl_shader_program *shProg)
  67 {
  68    if (!shProg->last_vert_prog)
  69       return false;
  70
  71    struct using_program_tuple callback_data;
  72    callback_data.found = false;
  73    callback_data.prog = shProg->last_vert_prog;
  74
  75    _mesa_HashWalkLocked(ctx->TransformFeedback.Objects,
  76                         active_xfb_object_references_program, &callback_data);
  77
  78    /* Also check DefaultObject, as it's not in the Objects hash table. */
  79    active_xfb_object_references_program(0, ctx->TransformFeedback.DefaultObject,
  80                                         &callback_data);
  81
  82    return callback_data.found;
  83 }
  84
  85 /**
  86  * Do reference counting of transform feedback buffers.
  87  */
  88 static void
  89 reference_transform_feedback_object(struct gl_transform_feedback_object **ptr,
  90                                     struct gl_transform_feedback_object *obj)
  91 {
  92    if (*ptr == obj)
  93       return;
  94
  95    if (*ptr) {
  96       /* Unreference the old object */
  97       struct gl_transform_feedback_object *oldObj = *ptr;
  98
  99       assert(oldObj->RefCount > 0);
 100       oldObj->RefCount--;
 101
 102       if (oldObj->RefCount == 0) {
 103          GET_CURRENT_CONTEXT(ctx);
 104          if (ctx)
 105             ctx->Driver.DeleteTransformFeedback(ctx, oldObj);
 106       }
 107
 108       *ptr = NULL;
 109    }
 110    assert(!*ptr);
 111
 112    if (obj) {
 113       assert(obj->RefCount > 0);
 114
 115       /* reference new object */
 116       obj->RefCount++;
 117       obj->EverBound = GL_TRUE;
 118       *ptr = obj;
 119    }
 120 }
 121
 122
 123 /**
 124  * Per-context init for transform feedback.
 125  */
 126 void
 127 _mesa_init_transform_feedback(struct gl_context *ctx)
 128 {
 129    /* core mesa expects this, even a dummy one, to be available */
 130    assert(ctx->Driver.NewTransformFeedback);
 131
 132    ctx->TransformFeedback.DefaultObject =
 133       ctx->Driver.NewTransformFeedback(ctx, 0);
 134
 135    assert(ctx->TransformFeedback.DefaultObject->RefCount == 1);
 136
 137    reference_transform_feedback_object(&ctx->TransformFeedback.CurrentObject,
 138                                        ctx->TransformFeedback.DefaultObject);
 139
 140    assert(ctx->TransformFeedback.DefaultObject->RefCount == 2);
 141
 142    ctx->TransformFeedback.Objects = _mesa_NewHashTable();
 143
 144    _mesa_reference_buffer_object(ctx,
 145                                  &ctx->TransformFeedback.CurrentBuffer,
 146                                  ctx->Shared->NullBufferObj);
 147 }
 148
 149
 150
 151 /**
 152  * Callback for _mesa_HashDeleteAll().
 153  */
 154 static void
 155 delete_cb(GLuint key, void *data, void *userData)
 156 {
 157    struct gl_context *ctx = (struct gl_context *) userData;
 158    struct gl_transform_feedback_object *obj =
 159       (struct gl_transform_feedback_object *) data;
 160
 161    ctx->Driver.DeleteTransformFeedback(ctx, obj);
 162 }
 163
 164
 165 /**
 166  * Per-context free/clean-up for transform feedback.
 167  */
 168 void
 169 _mesa_free_transform_feedback(struct gl_context *ctx)
 170 {
 171    /* core mesa expects this, even a dummy one, to be available */
 172    assert(ctx->Driver.NewTransformFeedback);
 173
 174    _mesa_reference_buffer_object(ctx,
 175                                  &ctx->TransformFeedback.CurrentBuffer,
 176                                  NULL);
 177
 178    /* Delete all feedback objects */
 179    _mesa_HashDeleteAll(ctx->TransformFeedback.Objects, delete_cb, ctx);
 180    _mesa_DeleteHashTable(ctx->TransformFeedback.Objects);
 181
 182    /* Delete the default feedback object */
 183    assert(ctx->Driver.DeleteTransformFeedback);
 184    ctx->Driver.DeleteTransformFeedback(ctx,
 185                                        ctx->TransformFeedback.DefaultObject);
 186
 187    ctx->TransformFeedback.CurrentObject = NULL;
 188 }
 189
 190
 191 /** Initialize the fields of a gl_transform_feedback_object. */
 192 void
 193 _mesa_init_transform_feedback_object(struct gl_transform_feedback_object *obj,
 194                                      GLuint name)
 195 {
 196    obj->Name = name;
 197    obj->RefCount = 1;
 198    obj->EverBound = GL_FALSE;
 199 }
 200
 201
 202 /** Default fallback for ctx->Driver.NewTransformFeedback() */
 203 static struct gl_transform_feedback_object *
 204 new_transform_feedback_fallback(struct gl_context *ctx, GLuint name)
 205 {
 206    struct gl_transform_feedback_object *obj;
 207
 208    obj = CALLOC_STRUCT(gl_transform_feedback_object);
 209    if (!obj)
 210       return NULL;
 211
 212    _mesa_init_transform_feedback_object(obj, name);
 213    return obj;
 214 }
 215
 216 /** Default fallback for ctx->Driver.DeleteTransformFeedback() */
 217 static void
 218 delete_transform_feedback_fallback(struct gl_context *ctx,
 219                                    struct gl_transform_feedback_object *obj)
 220 {
 221    GLuint i;
 222
 223    for (i = 0; i < ARRAY_SIZE(obj->Buffers); i++) {
 224       _mesa_reference_buffer_object(ctx, &obj->Buffers[i], NULL);
 225    }
 226
 227    free(obj->Label);
 228    free(obj);
 229 }
 230
 231
 232 /** Default fallback for ctx->Driver.BeginTransformFeedback() */
 233 static void
 234 begin_transform_feedback_fallback(struct gl_context *ctx, GLenum mode,
 235                                   struct gl_transform_feedback_object *obj)
 236 {
 237    /* nop */
 238 }
 239
 240 /** Default fallback for ctx->Driver.EndTransformFeedback() */
 241 static void
 242 end_transform_feedback_fallback(struct gl_context *ctx,
 243                                 struct gl_transform_feedback_object *obj)
 244 {
 245    /* nop */
 246 }
 247
 248 /** Default fallback for ctx->Driver.PauseTransformFeedback() */
 249 static void
 250 pause_transform_feedback_fallback(struct gl_context *ctx,
 251                                   struct gl_transform_feedback_object *obj)
 252 {
 253    /* nop */
 254 }
 255
 256 /** Default fallback for ctx->Driver.ResumeTransformFeedback() */
 257 static void
 258 resume_transform_feedback_fallback(struct gl_context *ctx,
 259                                    struct gl_transform_feedback_object *obj)
 260 {
 261    /* nop */
 262 }
 263
 264
 265 /**
 266  * Plug in default device driver functions for transform feedback.
 267  * Most drivers will override some/all of these.
 268  */
 269 void
 270 _mesa_init_transform_feedback_functions(struct dd_function_table *driver)
 271 {
 272    driver->NewTransformFeedback = new_transform_feedback_fallback;
 273    driver->DeleteTransformFeedback = delete_transform_feedback_fallback;
 274    driver->BeginTransformFeedback = begin_transform_feedback_fallback;
 275    driver->EndTransformFeedback = end_transform_feedback_fallback;
 276    driver->PauseTransformFeedback = pause_transform_feedback_fallback;
 277    driver->ResumeTransformFeedback = resume_transform_feedback_fallback;
 278 }
 279
 280
 281 /**
 282  * Fill in the correct Size value for each buffer in \c obj.
 283  *
 284  * From the GL 4.3 spec, section 6.1.1 ("Binding Buffer Objects to Indexed
 285  * Targets"):
 286  *
 287  *   BindBufferBase binds the entire buffer, even when the size of the buffer
 288  *   is changed after the binding is established. It is equivalent to calling
 289  *   BindBufferRange with offset zero, while size is determined by the size of
 290  *   the bound buffer at the time the binding is used.
 291  *
 292  *   Regardless of the size specified with BindBufferRange, or indirectly with
 293  *   BindBufferBase, the GL will never read or write beyond the end of a bound
 294  *   buffer. In some cases this constraint may result in visibly different
 295  *   behavior when a buffer overflow would otherwise result, such as described
 296  *   for transform feedback operations in section 13.2.2.
 297  */
 298 static void
 299 compute_transform_feedback_buffer_sizes(
 300       struct gl_transform_feedback_object *obj)
 301 {
 302    unsigned i = 0;
 303    for (i = 0; i < MAX_FEEDBACK_BUFFERS; ++i) {
 304       GLintptr offset = obj->Offset[i];
 305       GLsizeiptr buffer_size
 306          = obj->Buffers[i] == NULL ? 0 : obj->Buffers[i]->Size;
 307       GLsizeiptr available_space
 308          = buffer_size <= offset ? 0 : buffer_size - offset;
 309       GLsizeiptr computed_size;
 310       if (obj->RequestedSize[i] == 0) {
 311          /* No size was specified at the time the buffer was bound, so allow
 312           * writing to all available space in the buffer.
 313           */
 314          computed_size = available_space;
 315       } else {
 316          /* A size was specified at the time the buffer was bound, however
 317           * it's possible that the buffer has shrunk since then.  So only
 318           * allow writing to the minimum of the specified size and the space
 319           * available.
 320           */
 321          computed_size = MIN2(available_space, obj->RequestedSize[i]);
 322       }
 323
 324       /* Legal sizes must be multiples of four, so round down if necessary. */
 325       obj->Size[i] = computed_size & ~0x3;
 326    }
 327 }
 328
 329
 330 /**
 331  * Compute the maximum number of vertices that can be written to the currently
 332  * enabled transform feedback buffers without overflowing any of them.
 333  */
 334 unsigned
 335 _mesa_compute_max_transform_feedback_vertices(struct gl_context *ctx,
 336       const struct gl_transform_feedback_object *obj,
 337       const struct gl_transform_feedback_info *info)
 338 {
 339    unsigned max_index = 0xffffffff;
 340    unsigned i;
 341
 342    for (i = 0; i < ctx->Const.MaxTransformFeedbackBuffers; i++) {
 343       if ((info->ActiveBuffers >> i) & 1) {
 344          unsigned stride = info->Buffers[i].Stride;
 345          unsigned max_for_this_buffer;
 346
 347          /* Skip any inactive buffers, which have a stride of 0. */
 348          if (stride == 0)
 349             continue;
 350
 351          max_for_this_buffer = obj->Size[i] / (4 * stride);
 352          max_index = MIN2(max_index, max_for_this_buffer);
 353       }
 354    }
 355
 356    return max_index;
 357 }
 358
 359
 360 /**
 361  ** Begin API functions
 362  **/
 363
 364
 365 /**
 366  * Figure out which stage of the pipeline is the source of transform feedback
 367  * data given the current context state, and return its gl_program.
 368  *
 369  * If no active program can generate transform feedback data (i.e. no vertex
 370  * shader is active), returns NULL.
 371  */
 372 static struct gl_program *
 373 get_xfb_source(struct gl_context *ctx)
 374 {
 375    int i;
 376    for (i = MESA_SHADER_GEOMETRY; i >= MESA_SHADER_VERTEX; i--) {
 377       if (ctx->_Shader->CurrentProgram[i] != NULL)
 378          return ctx->_Shader->CurrentProgram[i];
 379    }
 380    return NULL;
 381 }
 382
 383
 384 static ALWAYS_INLINE void
 385 begin_transform_feedback(struct gl_context *ctx, GLenum mode, bool no_error)
 386 {
 387    struct gl_transform_feedback_object *obj;
 388    struct gl_transform_feedback_info *info = NULL;
 389    struct gl_program *source;
 390    GLuint i;
 391    unsigned vertices_per_prim;
 392
 393    obj = ctx->TransformFeedback.CurrentObject;
 394
 395    /* Figure out what pipeline stage is the source of data for transform
 396     * feedback.
 397     */
 398    source = get_xfb_source(ctx);
 399    if (!no_error && source == NULL) {
 400       _mesa_error(ctx, GL_INVALID_OPERATION,
 401                   "glBeginTransformFeedback(no program active)");
 402       return;
 403    }
 404
 405    info = source->sh.LinkedTransformFeedback;
 406
 407    if (!no_error && info->NumOutputs == 0) {
 408       _mesa_error(ctx, GL_INVALID_OPERATION,
 409                   "glBeginTransformFeedback(no varyings to record)");
 410       return;
 411    }
 412
 413    switch (mode) {
 414    case GL_POINTS:
 415       vertices_per_prim = 1;
 416       break;
 417    case GL_LINES:
 418       vertices_per_prim = 2;
 419       break;
 420    case GL_TRIANGLES:
 421       vertices_per_prim = 3;
 422       break;
 423    default:
 424       if (!no_error) {
 425          _mesa_error(ctx, GL_INVALID_ENUM, "glBeginTransformFeedback(mode)");
 426          return;
 427       } else {
 428          /* Stop compiler warnings */
 429          unreachable("Error in API use when using KHR_no_error");
 430       }
 431    }
 432
 433    if (!no_error) {
 434       if (obj->Active) {
 435          _mesa_error(ctx, GL_INVALID_OPERATION,
 436                      "glBeginTransformFeedback(already active)");
 437          return;
 438       }
 439
 440       for (i = 0; i < ctx->Const.MaxTransformFeedbackBuffers; i++) {
 441          if ((info->ActiveBuffers >> i) & 1) {
 442             if (obj->BufferNames[i] == 0) {
 443                _mesa_error(ctx, GL_INVALID_OPERATION,
 444                            "glBeginTransformFeedback(binding point %d does not "
 445                            "have a buffer object bound)", i);
 446                return;
 447             }
 448          }
 449       }
 450    }
 451
 452    FLUSH_VERTICES(ctx, 0);
 453    ctx->NewDriverState |= ctx->DriverFlags.NewTransformFeedback;
 454
 455    obj->Active = GL_TRUE;
 456    ctx->TransformFeedback.Mode = mode;
 457
 458    compute_transform_feedback_buffer_sizes(obj);
 459
 460    if (_mesa_is_gles3(ctx)) {
 461       /* In GLES3, we are required to track the usage of the transform
 462        * feedback buffer and report INVALID_OPERATION if a draw call tries to
 463        * exceed it.  So compute the maximum number of vertices that we can
 464        * write without overflowing any of the buffers currently being used for
 465        * feedback.
 466        */
 467       unsigned max_vertices
 468          = _mesa_compute_max_transform_feedback_vertices(ctx, obj, info);
 469       obj->GlesRemainingPrims = max_vertices / vertices_per_prim;
 470    }
 471
 472    if (obj->program != source) {
 473       ctx->NewDriverState |= ctx->DriverFlags.NewTransformFeedbackProg;
 474       obj->program = source;
 475    }
 476
 477    assert(ctx->Driver.BeginTransformFeedback);
 478    ctx->Driver.BeginTransformFeedback(ctx, mode, obj);
 479 }
 480
 481
 482 void GLAPIENTRY
 483 _mesa_BeginTransformFeedback(GLenum mode)
 484 {
 485    GET_CURRENT_CONTEXT(ctx);
 486    begin_transform_feedback(ctx, mode, false);
 487 }
 488
 489
 490 void GLAPIENTRY
 491 _mesa_EndTransformFeedback(void)
 492 {
 493    struct gl_transform_feedback_object *obj;
 494    GET_CURRENT_CONTEXT(ctx);
 495
 496    obj = ctx->TransformFeedback.CurrentObject;
 497
 498    if (!obj->Active) {
 499       _mesa_error(ctx, GL_INVALID_OPERATION,
 500                   "glEndTransformFeedback(not active)");
 501       return;
 502    }
 503
 504    FLUSH_VERTICES(ctx, 0);
 505    ctx->NewDriverState |= ctx->DriverFlags.NewTransformFeedback;
 506
 507    assert(ctx->Driver.EndTransformFeedback);
 508    ctx->Driver.EndTransformFeedback(ctx, obj);
 509
 510    ctx->TransformFeedback.CurrentObject->Active = GL_FALSE;
 511    ctx->TransformFeedback.CurrentObject->Paused = GL_FALSE;
 512    ctx->TransformFeedback.CurrentObject->EndedAnytime = GL_TRUE;
 513 }
 514
 515
 516 /**
 517  * Helper used by BindBufferRange() and BindBufferBase().
 518  */
 519 static void
 520 bind_buffer_range(struct gl_context *ctx,
 521                   struct gl_transform_feedback_object *obj,
 522                   GLuint index,
 523                   struct gl_buffer_object *bufObj,
 524                   GLintptr offset, GLsizeiptr size,
 525                   bool dsa)
 526 {
 527    /* Note: no need to FLUSH_VERTICES or flag NewTransformFeedback, because
 528     * transform feedback buffers can't be changed while transform feedback is
 529     * active.
 530     */
 531
 532    if (!dsa) {
 533       /* The general binding point */
 534       _mesa_reference_buffer_object(ctx,
 535                                     &ctx->TransformFeedback.CurrentBuffer,
 536                                     bufObj);
 537    }
 538
 539    /* The per-attribute binding point */
 540    _mesa_set_transform_feedback_binding(ctx, obj, index, bufObj, offset, size);
 541 }
 542
 543
 544 /**
 545  * Validate the buffer object to receive transform feedback results.  Plus,
 546  * validate the starting offset to place the results, and max size.
 547  * Called from the glBindBufferRange() and glTransformFeedbackBufferRange
 548  * functions.
 549  */
 550 bool
 551 _mesa_validate_buffer_range_xfb(struct gl_context *ctx,
 552                                 struct gl_transform_feedback_object *obj,
 553                                 GLuint index, struct gl_buffer_object *bufObj,
 554                                 GLintptr offset, GLsizeiptr size, bool dsa)
 555 {
 556    const char *gl_methd_name;
 557    if (dsa)
 558       gl_methd_name = "glTransformFeedbackBufferRange";
 559    else
 560       gl_methd_name = "glBindBufferRange";
 561
 562
 563    if (obj->Active) {
 564       _mesa_error(ctx, GL_INVALID_OPERATION, "%s(transform feedback active)",
 565                   gl_methd_name);
 566       return false;
 567    }
 568
 569    if (index >= ctx->Const.MaxTransformFeedbackBuffers) {
 570       /* OpenGL 4.5 core profile, 6.1, pdf page 82: "An INVALID_VALUE error is
 571        * generated if index is greater than or equal to the number of binding
 572        * points for transform feedback, as described in section 6.7.1."
 573        */
 574       _mesa_error(ctx, GL_INVALID_VALUE, "%s(index=%d out of bounds)",
 575                   gl_methd_name, index);
 576       return false;
 577    }
 578
 579    if (size & 0x3) {
 580       /* OpenGL 4.5 core profile, 6.7, pdf page 103: multiple of 4 */
 581       _mesa_error(ctx, GL_INVALID_VALUE, "%s(size=%d must be a multiple of "
 582                   "four)", gl_methd_name, (int) size);
 583       return false;
 584    }
 585
 586    if (offset & 0x3) {
 587       /* OpenGL 4.5 core profile, 6.7, pdf page 103: multiple of 4 */
 588       _mesa_error(ctx, GL_INVALID_VALUE, "%s(offset=%d must be a multiple "
 589                   "of four)", gl_methd_name, (int) offset);
 590       return false;
 591    }
 592
 593    if (offset < 0) {
 594       /* OpenGL 4.5 core profile, 6.1, pdf page 82: "An INVALID_VALUE error is
 595        * generated by BindBufferRange if offset is negative."
 596        *
 597        * OpenGL 4.5 core profile, 13.2, pdf page 445: "An INVALID_VALUE error
 598        * is generated by TransformFeedbackBufferRange if offset is negative."
 599        */
 600       _mesa_error(ctx, GL_INVALID_VALUE, "%s(offset=%d must be >= 0)",
 601                   gl_methd_name,
 602                   (int) offset);
 603       return false;
 604    }
 605
 606    if (size <= 0 && (dsa || bufObj != ctx->Shared->NullBufferObj)) {
 607       /* OpenGL 4.5 core profile, 6.1, pdf page 82: "An INVALID_VALUE error is
 608        * generated by BindBufferRange if buffer is non-zero and size is less
 609        * than or equal to zero."
 610        *
 611        * OpenGL 4.5 core profile, 13.2, pdf page 445: "An INVALID_VALUE error
 612        * is generated by TransformFeedbackBufferRange if size is less than or
 613        * equal to zero."
 614        */
 615       _mesa_error(ctx, GL_INVALID_VALUE, "%s(size=%d must be > 0)",
 616                   gl_methd_name, (int) size);
 617       return false;
 618    }
 619
 620    return true;
 621 }
 622
 623
 624 /**
 625  * Specify a buffer object to receive transform feedback results.
 626  * As above, but start at offset = 0.
 627  * Called from the glBindBufferBase() and glTransformFeedbackBufferBase()
 628  * functions.
 629  */
 630 void
 631 _mesa_bind_buffer_base_transform_feedback(struct gl_context *ctx,
 632                                           struct gl_transform_feedback_object *obj,
 633                                           GLuint index,
 634                                           struct gl_buffer_object *bufObj,
 635                                           bool dsa)
 636 {
 637    if (obj->Active) {
 638       _mesa_error(ctx, GL_INVALID_OPERATION,
 639                   "%s(transform feedback active)",
 640                   dsa ? "glTransformFeedbackBufferBase" : "glBindBufferBase");
 641       return;
 642    }
 643
 644    if (index >= ctx->Const.MaxTransformFeedbackBuffers) {
 645       _mesa_error(ctx, GL_INVALID_VALUE, "%s(index=%d out of bounds)",
 646                   dsa ? "glTransformFeedbackBufferBase" : "glBindBufferBase",
 647                   index);
 648       return;
 649    }
 650
 651    bind_buffer_range(ctx, obj, index, bufObj, 0, 0, dsa);
 652 }
 653
 654 /**
 655  * Wrapper around lookup_transform_feedback_object that throws
 656  * GL_INVALID_OPERATION if id is not in the hash table. After calling
 657  * _mesa_error, it returns NULL.
 658  */
 659 static struct gl_transform_feedback_object *
 660 lookup_transform_feedback_object_err(struct gl_context *ctx,
 661                                      GLuint xfb, const char* func)
 662 {
 663    struct gl_transform_feedback_object *obj;
 664
 665    obj = _mesa_lookup_transform_feedback_object(ctx, xfb);
 666    if (!obj) {
 667       _mesa_error(ctx, GL_INVALID_OPERATION,
 668                   "%s(xfb=%u: non-generated object name)", func, xfb);
 669    }
 670
 671    return obj;
 672 }
 673
 674 /**
 675  * Wrapper around _mesa_lookup_bufferobj that throws GL_INVALID_VALUE if id
 676  * is not in the hash table. Specialised version for the
 677  * transform-feedback-related functions. After calling _mesa_error, it
 678  * returns NULL.
 679  */
 680 static struct gl_buffer_object *
 681 lookup_transform_feedback_bufferobj_err(struct gl_context *ctx,
 682                                         GLuint buffer, const char* func)
 683 {
 684    struct gl_buffer_object *bufObj;
 685
 686    /* OpenGL 4.5 core profile, 13.2, pdf page 444: buffer must be zero or the
 687     * name of an existing buffer object.
 688     */
 689    if (buffer == 0) {
 690       bufObj = ctx->Shared->NullBufferObj;
 691    } else {
 692       bufObj = _mesa_lookup_bufferobj(ctx, buffer);
 693       if (!bufObj) {
 694          _mesa_error(ctx, GL_INVALID_VALUE, "%s(invalid buffer=%u)", func,
 695                      buffer);
 696       }
 697    }
 698
 699    return bufObj;
 700 }
 701
 702 void GLAPIENTRY
 703 _mesa_TransformFeedbackBufferBase(GLuint xfb, GLuint index, GLuint buffer)
 704 {
 705    GET_CURRENT_CONTEXT(ctx);
 706    struct gl_transform_feedback_object *obj;
 707    struct gl_buffer_object *bufObj;
 708
 709    obj = lookup_transform_feedback_object_err(ctx, xfb,
 710                                               "glTransformFeedbackBufferBase");
 711    if(!obj) {
 712       return;
 713    }
 714
 715    bufObj = lookup_transform_feedback_bufferobj_err(ctx, buffer,
 716                                               "glTransformFeedbackBufferBase");
 717    if(!bufObj) {
 718       return;
 719    }
 720
 721    _mesa_bind_buffer_base_transform_feedback(ctx, obj, index, bufObj, true);
 722 }
 723
 724 void GLAPIENTRY
 725 _mesa_TransformFeedbackBufferRange(GLuint xfb, GLuint index, GLuint buffer,
 726                                    GLintptr offset, GLsizeiptr size)
 727 {
 728    GET_CURRENT_CONTEXT(ctx);
 729    struct gl_transform_feedback_object *obj;
 730    struct gl_buffer_object *bufObj;
 731
 732    obj = lookup_transform_feedback_object_err(ctx, xfb,
 733                                               "glTransformFeedbackBufferRange");
 734    if(!obj) {
 735       return;
 736    }
 737
 738    bufObj = lookup_transform_feedback_bufferobj_err(ctx, buffer,
 739                                               "glTransformFeedbackBufferRange");
 740    if(!bufObj) {
 741       return;
 742    }
 743
 744    if (!_mesa_validate_buffer_range_xfb(ctx, obj, index, bufObj, offset,
 745                                         size, true))
 746       return;
 747
 748    /* The per-attribute binding point */
 749    _mesa_set_transform_feedback_binding(ctx, obj, index, bufObj, offset,
 750                                         size);
 751 }
 752
 753 /**
 754  * Specify a buffer object to receive transform feedback results, plus the
 755  * offset in the buffer to start placing results.
 756  * This function is part of GL_EXT_transform_feedback, but not GL3.
 757  */
 758 void GLAPIENTRY
 759 _mesa_BindBufferOffsetEXT(GLenum target, GLuint index, GLuint buffer,
 760                           GLintptr offset)
 761 {
 762    struct gl_transform_feedback_object *obj;
 763    struct gl_buffer_object *bufObj;
 764    GET_CURRENT_CONTEXT(ctx);
 765
 766    if (target != GL_TRANSFORM_FEEDBACK_BUFFER) {
 767       _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferOffsetEXT(target)");
 768       return;
 769    }
 770
 771    obj = ctx->TransformFeedback.CurrentObject;
 772
 773    if (obj->Active) {
 774       _mesa_error(ctx, GL_INVALID_OPERATION,
 775                   "glBindBufferOffsetEXT(transform feedback active)");
 776       return;
 777    }
 778
 779    if (index >= ctx->Const.MaxTransformFeedbackBuffers) {
 780       _mesa_error(ctx, GL_INVALID_VALUE,
 781                   "glBindBufferOffsetEXT(index=%d)", index);
 782       return;
 783    }
 784
 785    if (offset & 0x3) {
 786       /* must be multiple of four */
 787       _mesa_error(ctx, GL_INVALID_VALUE,
 788                   "glBindBufferOffsetEXT(offset=%d)", (int) offset);
 789       return;
 790    }
 791
 792    if (buffer == 0) {
 793       bufObj = ctx->Shared->NullBufferObj;
 794    } else {
 795       bufObj = _mesa_lookup_bufferobj(ctx, buffer);
 796       if (!bufObj) {
 797          _mesa_error(ctx, GL_INVALID_OPERATION,
 798                      "glBindBufferOffsetEXT(invalid buffer=%u)", buffer);
 799          return;
 800       }
 801    }
 802
 803    _mesa_bind_buffer_range_xfb(ctx, obj, index, bufObj, offset, 0);
 804 }
 805
 806
 807 /**
 808  * This function specifies the transform feedback outputs to be written
 809  * to the feedback buffer(s), and in what order.
 810  */
 811 void GLAPIENTRY
 812 _mesa_TransformFeedbackVaryings(GLuint program, GLsizei count,
 813                                 const GLchar * const *varyings,
 814                                 GLenum bufferMode)
 815 {
 816    struct gl_shader_program *shProg;
 817    GLint i;
 818    GET_CURRENT_CONTEXT(ctx);
 819
 820    /* From the ARB_transform_feedback2 specification:
 821     * "The error INVALID_OPERATION is generated by TransformFeedbackVaryings
 822     *  if the current transform feedback object is active, even if paused."
 823     */
 824    if (ctx->TransformFeedback.CurrentObject->Active) {
 825       _mesa_error(ctx, GL_INVALID_OPERATION,
 826                "glTransformFeedbackVaryings(current object is active)");
 827       return;
 828    }
 829
 830    switch (bufferMode) {
 831    case GL_INTERLEAVED_ATTRIBS:
 832       break;
 833    case GL_SEPARATE_ATTRIBS:
 834       break;
 835    default:
 836       _mesa_error(ctx, GL_INVALID_ENUM,
 837                   "glTransformFeedbackVaryings(bufferMode)");
 838       return;
 839    }
 840
 841    if (count < 0 ||
 842        (bufferMode == GL_SEPARATE_ATTRIBS &&
 843         (GLuint) count > ctx->Const.MaxTransformFeedbackBuffers)) {
 844       _mesa_error(ctx, GL_INVALID_VALUE,
 845                   "glTransformFeedbackVaryings(count=%d)", count);
 846       return;
 847    }
 848
 849    shProg = _mesa_lookup_shader_program_err(ctx, program,
 850                                             "glTransformFeedbackVaryings");
 851    if (!shProg)
 852       return;
 853
 854    if (ctx->Extensions.ARB_transform_feedback3) {
 855       if (bufferMode == GL_INTERLEAVED_ATTRIBS) {
 856          unsigned buffers = 1;
 857
 858          for (i = 0; i < count; i++) {
 859             if (strcmp(varyings[i], "gl_NextBuffer") == 0)
 860                buffers++;
 861          }
 862
 863          if (buffers > ctx->Const.MaxTransformFeedbackBuffers) {
 864             _mesa_error(ctx, GL_INVALID_OPERATION,
 865                         "glTransformFeedbackVaryings(too many gl_NextBuffer "
 866                         "occurrences)");
 867             return;
 868          }
 869       } else {
 870          for (i = 0; i < count; i++) {
 871             if (strcmp(varyings[i], "gl_NextBuffer") == 0 ||
 872                 strcmp(varyings[i], "gl_SkipComponents1") == 0 ||
 873                 strcmp(varyings[i], "gl_SkipComponents2") == 0 ||
 874                 strcmp(varyings[i], "gl_SkipComponents3") == 0 ||
 875                 strcmp(varyings[i], "gl_SkipComponents4") == 0) {
 876                _mesa_error(ctx, GL_INVALID_OPERATION,
 877                            "glTransformFeedbackVaryings(SEPARATE_ATTRIBS,"
 878                            "varying=%s)",
 879                            varyings[i]);
 880                return;
 881             }
 882          }
 883       }
 884    }
 885
 886    /* free existing varyings, if any */
 887    for (i = 0; i < (GLint) shProg->TransformFeedback.NumVarying; i++) {
 888       free(shProg->TransformFeedback.VaryingNames[i]);
 889    }
 890    free(shProg->TransformFeedback.VaryingNames);
 891
 892    /* allocate new memory for varying names */
 893    shProg->TransformFeedback.VaryingNames =
 894       malloc(count * sizeof(GLchar *));
 895
 896    if (!shProg->TransformFeedback.VaryingNames) {
 897       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glTransformFeedbackVaryings()");
 898       return;
 899    }
 900
 901    /* Save the new names and the count */
 902    for (i = 0; i < count; i++) {
 903       shProg->TransformFeedback.VaryingNames[i] = strdup(varyings[i]);
 904    }
 905    shProg->TransformFeedback.NumVarying = count;
 906
 907    shProg->TransformFeedback.BufferMode = bufferMode;
 908
 909    /* No need to invoke FLUSH_VERTICES or flag NewTransformFeedback since
 910     * the varyings won't be used until shader link time.
 911     */
 912 }
 913
 914
 915 /**
 916  * Get info about the transform feedback outputs which are to be written
 917  * to the feedback buffer(s).
 918  */
 919 void GLAPIENTRY
 920 _mesa_GetTransformFeedbackVarying(GLuint program, GLuint index,
 921                                   GLsizei bufSize, GLsizei *length,
 922                                   GLsizei *size, GLenum *type, GLchar *name)
 923 {
 924    const struct gl_shader_program *shProg;
 925    struct gl_program_resource *res;
 926    GET_CURRENT_CONTEXT(ctx);
 927
 928    shProg = _mesa_lookup_shader_program_err(ctx, program,
 929                                             "glGetTransformFeedbackVarying");
 930    if (!shProg)
 931       return;
 932
 933    res = _mesa_program_resource_find_index((struct gl_shader_program *) shProg,
 934                                            GL_TRANSFORM_FEEDBACK_VARYING,
 935                                            index);
 936    if (!res) {
 937       _mesa_error(ctx, GL_INVALID_VALUE,
 938                   "glGetTransformFeedbackVarying(index=%u)", index);
 939       return;
 940    }
 941
 942    /* return the varying's name and length */
 943    _mesa_copy_string(name, bufSize, length, _mesa_program_resource_name(res));
 944
 945    /* return the datatype and value's size (in datatype units) */
 946    if (type)
 947       _mesa_program_resource_prop((struct gl_shader_program *) shProg,
 948                                   res, index, GL_TYPE, (GLint*) type,
 949                                   "glGetTransformFeedbackVarying");
 950    if (size)
 951       _mesa_program_resource_prop((struct gl_shader_program *) shProg,
 952                                   res, index, GL_ARRAY_SIZE, (GLint*) size,
 953                                   "glGetTransformFeedbackVarying");
 954 }
 955
 956
 957
 958 struct gl_transform_feedback_object *
 959 _mesa_lookup_transform_feedback_object(struct gl_context *ctx, GLuint name)
 960 {
 961    /* OpenGL 4.5 core profile, 13.2 pdf page 444: "xfb must be zero, indicating
 962     * the default transform feedback object, or the name of an existing
 963     * transform feedback object."
 964     */
 965    if (name == 0) {
 966       return ctx->TransformFeedback.DefaultObject;
 967    }
 968    else
 969       return (struct gl_transform_feedback_object *)
 970          _mesa_HashLookupLocked(ctx->TransformFeedback.Objects, name);
 971 }
 972
 973 static void
 974 create_transform_feedbacks(struct gl_context *ctx, GLsizei n, GLuint *ids,
 975                            bool dsa)
 976 {
 977    GLuint first;
 978    const char* func;
 979
 980    if (dsa)
 981       func = "glCreateTransformFeedbacks";
 982    else
 983       func = "glGenTransformFeedbacks";
 984
 985    if (n < 0) {
 986       _mesa_error(ctx, GL_INVALID_VALUE, "%s(n < 0)", func);
 987       return;
 988    }
 989
 990    if (!ids)
 991       return;
 992
 993    /* we don't need contiguous IDs, but this might be faster */
 994    first = _mesa_HashFindFreeKeyBlock(ctx->TransformFeedback.Objects, n);
 995    if (first) {
 996       GLsizei i;
 997       for (i = 0; i < n; i++) {
 998          struct gl_transform_feedback_object *obj
 999             = ctx->Driver.NewTransformFeedback(ctx, first + i);
1000          if (!obj) {
1001             _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s", func);
1002             return;
1003          }
1004          ids[i] = first + i;
1005          _mesa_HashInsertLocked(ctx->TransformFeedback.Objects, first + i,
1006                                 obj);
1007          if (dsa) {
1008             /* this is normally done at bind time in the non-dsa case */
1009             obj->EverBound = GL_TRUE;
1010          }
1011       }
1012    }
1013    else {
1014       _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s", func);
1015    }
1016 }
1017
1018 /**
1019  * Create new transform feedback objects.   Transform feedback objects
1020  * encapsulate the state related to transform feedback to allow quickly
1021  * switching state (and drawing the results, below).
1022  * Part of GL_ARB_transform_feedback2.
1023  */
1024 void GLAPIENTRY
1025 _mesa_GenTransformFeedbacks(GLsizei n, GLuint *names)
1026 {
1027    GET_CURRENT_CONTEXT(ctx);
1028
1029    /* GenTransformFeedbacks should just reserve the object names that a
1030     * subsequent call to BindTransformFeedback should actively create. For
1031     * the sake of simplicity, we reserve the names and create the objects
1032     * straight away.
1033     */
1034
1035    create_transform_feedbacks(ctx, n, names, false);
1036 }
1037
1038 /**
1039  * Create new transform feedback objects.   Transform feedback objects
1040  * encapsulate the state related to transform feedback to allow quickly
1041  * switching state (and drawing the results, below).
1042  * Part of GL_ARB_direct_state_access.
1043  */
1044 void GLAPIENTRY
1045 _mesa_CreateTransformFeedbacks(GLsizei n, GLuint *names)
1046 {
1047    GET_CURRENT_CONTEXT(ctx);
1048
1049    create_transform_feedbacks(ctx, n, names, true);
1050 }
1051
1052
1053 /**
1054  * Is the given ID a transform feedback object?
1055  * Part of GL_ARB_transform_feedback2.
1056  */
1057 GLboolean GLAPIENTRY
1058 _mesa_IsTransformFeedback(GLuint name)
1059 {
1060    struct gl_transform_feedback_object *obj;
1061    GET_CURRENT_CONTEXT(ctx);
1062
1063    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
1064
1065    if (name == 0)
1066       return GL_FALSE;
1067
1068    obj = _mesa_lookup_transform_feedback_object(ctx, name);
1069    if (obj == NULL)
1070       return GL_FALSE;
1071
1072    return obj->EverBound;
1073 }
1074
1075
1076 /**
1077  * Bind the given transform feedback object.
1078  * Part of GL_ARB_transform_feedback2.
1079  */
1080 static ALWAYS_INLINE void
1081 bind_transform_feedback(struct gl_context *ctx, GLuint name, bool no_error)
1082 {
1083    struct gl_transform_feedback_object *obj;
1084
1085    obj = _mesa_lookup_transform_feedback_object(ctx, name);
1086    if (!no_error && !obj) {
1087       _mesa_error(ctx, GL_INVALID_OPERATION,
1088                   "glBindTransformFeedback(name=%u)", name);
1089       return;
1090    }
1091
1092    reference_transform_feedback_object(&ctx->TransformFeedback.CurrentObject,
1093                                        obj);
1094 }
1095
1096
1097 void GLAPIENTRY
1098 _mesa_BindTransformFeedback_no_error(GLenum target, GLuint name)
1099 {
1100    GET_CURRENT_CONTEXT(ctx);
1101    bind_transform_feedback(ctx, name, true);
1102 }
1103
1104
1105 void GLAPIENTRY
1106 _mesa_BindTransformFeedback(GLenum target, GLuint name)
1107 {
1108    GET_CURRENT_CONTEXT(ctx);
1109
1110    if (target != GL_TRANSFORM_FEEDBACK) {
1111       _mesa_error(ctx, GL_INVALID_ENUM, "glBindTransformFeedback(target)");
1112       return;
1113    }
1114
1115    if (_mesa_is_xfb_active_and_unpaused(ctx)) {
1116       _mesa_error(ctx, GL_INVALID_OPERATION,
1117               "glBindTransformFeedback(transform is active, or not paused)");
1118       return;
1119    }
1120
1121    bind_transform_feedback(ctx, name, false);
1122 }
1123
1124
1125 /**
1126  * Delete the given transform feedback objects.
1127  * Part of GL_ARB_transform_feedback2.
1128  */
1129 void GLAPIENTRY
1130 _mesa_DeleteTransformFeedbacks(GLsizei n, const GLuint *names)
1131 {
1132    GLint i;
1133    GET_CURRENT_CONTEXT(ctx);
1134
1135    if (n < 0) {
1136       _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteTransformFeedbacks(n < 0)");
1137       return;
1138    }
1139
1140    if (!names)
1141       return;
1142
1143    for (i = 0; i < n; i++) {
1144       if (names[i] > 0) {
1145          struct gl_transform_feedback_object *obj
1146             = _mesa_lookup_transform_feedback_object(ctx, names[i]);
1147          if (obj) {
1148             if (obj->Active) {
1149                _mesa_error(ctx, GL_INVALID_OPERATION,
1150                            "glDeleteTransformFeedbacks(object %u is active)",
1151                            names[i]);
1152                return;
1153             }
1154             _mesa_HashRemoveLocked(ctx->TransformFeedback.Objects, names[i]);
1155             /* unref, but object may not be deleted until later */
1156             if (obj == ctx->TransformFeedback.CurrentObject) {
1157                reference_transform_feedback_object(
1158                      &ctx->TransformFeedback.CurrentObject,
1159                      ctx->TransformFeedback.DefaultObject);
1160             }
1161             reference_transform_feedback_object(&obj, NULL);
1162          }
1163       }
1164    }
1165 }
1166
1167
1168 /**
1169  * Pause transform feedback.
1170  * Part of GL_ARB_transform_feedback2.
1171  */
1172 void GLAPIENTRY
1173 _mesa_PauseTransformFeedback(void)
1174 {
1175    struct gl_transform_feedback_object *obj;
1176    GET_CURRENT_CONTEXT(ctx);
1177
1178    obj = ctx->TransformFeedback.CurrentObject;
1179
1180    if (!_mesa_is_xfb_active_and_unpaused(ctx)) {
1181       _mesa_error(ctx, GL_INVALID_OPERATION,
1182            "glPauseTransformFeedback(feedback not active or already paused)");
1183       return;
1184    }
1185
1186    FLUSH_VERTICES(ctx, 0);
1187    ctx->NewDriverState |= ctx->DriverFlags.NewTransformFeedback;
1188
1189    assert(ctx->Driver.PauseTransformFeedback);
1190    ctx->Driver.PauseTransformFeedback(ctx, obj);
1191
1192    obj->Paused = GL_TRUE;
1193 }
1194
1195
1196 /**
1197  * Resume transform feedback.
1198  * Part of GL_ARB_transform_feedback2.
1199  */
1200 void GLAPIENTRY
1201 _mesa_ResumeTransformFeedback(void)
1202 {
1203    struct gl_transform_feedback_object *obj;
1204    GET_CURRENT_CONTEXT(ctx);
1205
1206    obj = ctx->TransformFeedback.CurrentObject;
1207
1208    if (!obj->Active || !obj->Paused) {
1209       _mesa_error(ctx, GL_INVALID_OPERATION,
1210                "glResumeTransformFeedback(feedback not active or not paused)");
1211       return;
1212    }
1213
1214    /* From the ARB_transform_feedback2 specification:
1215     * "The error INVALID_OPERATION is generated by ResumeTransformFeedback if
1216     *  the program object being used by the current transform feedback object
1217     *  is not active."
1218     */
1219    if (obj->program != get_xfb_source(ctx)) {
1220       _mesa_error(ctx, GL_INVALID_OPERATION,
1221                   "glResumeTransformFeedback(wrong program bound)");
1222       return;
1223    }
1224
1225    FLUSH_VERTICES(ctx, 0);
1226    ctx->NewDriverState |= ctx->DriverFlags.NewTransformFeedback;
1227
1228    obj->Paused = GL_FALSE;
1229
1230    assert(ctx->Driver.ResumeTransformFeedback);
1231    ctx->Driver.ResumeTransformFeedback(ctx, obj);
1232 }
1233
1234 extern void GLAPIENTRY
1235 _mesa_GetTransformFeedbackiv(GLuint xfb, GLenum pname, GLint *param)
1236 {
1237     struct gl_transform_feedback_object *obj;
1238     GET_CURRENT_CONTEXT(ctx);
1239
1240     obj = lookup_transform_feedback_object_err(ctx, xfb,
1241                                                "glGetTransformFeedbackiv");
1242     if(!obj) {
1243        return;
1244     }
1245
1246     switch(pname) {
1247     case GL_TRANSFORM_FEEDBACK_PAUSED:
1248        *param = obj->Paused;
1249        break;
1250     case GL_TRANSFORM_FEEDBACK_ACTIVE:
1251        *param = obj->Active;
1252        break;
1253     default:
1254        _mesa_error(ctx, GL_INVALID_ENUM,
1255                    "glGetTransformFeedbackiv(pname=%i)", pname);
1256     }
1257 }
1258
1259 extern void GLAPIENTRY
1260 _mesa_GetTransformFeedbacki_v(GLuint xfb, GLenum pname, GLuint index,
1261                               GLint *param)
1262 {
1263    struct gl_transform_feedback_object *obj;
1264    GET_CURRENT_CONTEXT(ctx);
1265
1266    obj = lookup_transform_feedback_object_err(ctx, xfb,
1267                                               "glGetTransformFeedbacki_v");
1268    if(!obj) {
1269       return;
1270    }
1271
1272    if (index >= ctx->Const.MaxTransformFeedbackBuffers) {
1273       _mesa_error(ctx, GL_INVALID_VALUE,
1274                   "glGetTransformFeedbacki_v(index=%i)", index);
1275       return;
1276    }
1277
1278    switch(pname) {
1279    case GL_TRANSFORM_FEEDBACK_BUFFER_BINDING:
1280       *param = obj->BufferNames[index];
1281       break;
1282    default:
1283       _mesa_error(ctx, GL_INVALID_ENUM,
1284                   "glGetTransformFeedbacki_v(pname=%i)", pname);
1285    }
1286 }
1287
1288 extern void GLAPIENTRY
1289 _mesa_GetTransformFeedbacki64_v(GLuint xfb, GLenum pname, GLuint index,
1290                                 GLint64 *param)
1291 {
1292    struct gl_transform_feedback_object *obj;
1293    GET_CURRENT_CONTEXT(ctx);
1294
1295    obj = lookup_transform_feedback_object_err(ctx, xfb,
1296                                               "glGetTransformFeedbacki64_v");
1297    if(!obj) {
1298       return;
1299    }
1300
1301    if (index >= ctx->Const.MaxTransformFeedbackBuffers) {
1302       _mesa_error(ctx, GL_INVALID_VALUE,
1303                   "glGetTransformFeedbacki64_v(index=%i)", index);
1304       return;
1305    }
1306
1307    compute_transform_feedback_buffer_sizes(obj);
1308    switch(pname) {
1309    case GL_TRANSFORM_FEEDBACK_BUFFER_START:
1310       *param = obj->Offset[index];
1311       break;
1312    case GL_TRANSFORM_FEEDBACK_BUFFER_SIZE:
1313       *param = obj->Size[index];
1314       break;
1315    default:
1316       _mesa_error(ctx, GL_INVALID_ENUM,
1317                   "glGetTransformFeedbacki64_v(pname=%i)", pname);
1318    }
1319 }