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_no_error(GLenum mode)
 484 {
 485    GET_CURRENT_CONTEXT(ctx);
 486    begin_transform_feedback(ctx, mode, true);
 487 }
 488
 489
 490 void GLAPIENTRY
 491 _mesa_BeginTransformFeedback(GLenum mode)
 492 {
 493    GET_CURRENT_CONTEXT(ctx);
 494    begin_transform_feedback(ctx, mode, false);
 495 }
 496
 497
 498 static void
 499 end_transform_feedback(struct gl_context *ctx,
 500                        struct gl_transform_feedback_object *obj)
 501 {
 502    FLUSH_VERTICES(ctx, 0);
 503    ctx->NewDriverState |= ctx->DriverFlags.NewTransformFeedback;
 504
 505    assert(ctx->Driver.EndTransformFeedback);
 506    ctx->Driver.EndTransformFeedback(ctx, obj);
 507
 508    ctx->TransformFeedback.CurrentObject->Active = GL_FALSE;
 509    ctx->TransformFeedback.CurrentObject->Paused = GL_FALSE;
 510    ctx->TransformFeedback.CurrentObject->EndedAnytime = GL_TRUE;
 511 }
 512
 513
 514 void GLAPIENTRY
 515 _mesa_EndTransformFeedback_no_error(void)
 516 {
 517    GET_CURRENT_CONTEXT(ctx);
 518    end_transform_feedback(ctx, ctx->TransformFeedback.CurrentObject);
 519 }
 520
 521
 522 void GLAPIENTRY
 523 _mesa_EndTransformFeedback(void)
 524 {
 525    struct gl_transform_feedback_object *obj;
 526    GET_CURRENT_CONTEXT(ctx);
 527
 528    obj = ctx->TransformFeedback.CurrentObject;
 529
 530    if (!obj->Active) {
 531       _mesa_error(ctx, GL_INVALID_OPERATION,
 532                   "glEndTransformFeedback(not active)");
 533       return;
 534    }
 535
 536    end_transform_feedback(ctx, obj);
 537 }
 538
 539
 540 /**
 541  * Helper used by BindBufferRange() and BindBufferBase().
 542  */
 543 static void
 544 bind_buffer_range(struct gl_context *ctx,
 545                   struct gl_transform_feedback_object *obj,
 546                   GLuint index,
 547                   struct gl_buffer_object *bufObj,
 548                   GLintptr offset, GLsizeiptr size,
 549                   bool dsa)
 550 {
 551    /* Note: no need to FLUSH_VERTICES or flag NewTransformFeedback, because
 552     * transform feedback buffers can't be changed while transform feedback is
 553     * active.
 554     */
 555
 556    if (!dsa) {
 557       /* The general binding point */
 558       _mesa_reference_buffer_object(ctx,
 559                                     &ctx->TransformFeedback.CurrentBuffer,
 560                                     bufObj);
 561    }
 562
 563    /* The per-attribute binding point */
 564    _mesa_set_transform_feedback_binding(ctx, obj, index, bufObj, offset, size);
 565 }
 566
 567
 568 /**
 569  * Validate the buffer object to receive transform feedback results.  Plus,
 570  * validate the starting offset to place the results, and max size.
 571  * Called from the glBindBufferRange() and glTransformFeedbackBufferRange
 572  * functions.
 573  */
 574 bool
 575 _mesa_validate_buffer_range_xfb(struct gl_context *ctx,
 576                                 struct gl_transform_feedback_object *obj,
 577                                 GLuint index, struct gl_buffer_object *bufObj,
 578                                 GLintptr offset, GLsizeiptr size, bool dsa)
 579 {
 580    const char *gl_methd_name;
 581    if (dsa)
 582       gl_methd_name = "glTransformFeedbackBufferRange";
 583    else
 584       gl_methd_name = "glBindBufferRange";
 585
 586
 587    if (obj->Active) {
 588       _mesa_error(ctx, GL_INVALID_OPERATION, "%s(transform feedback active)",
 589                   gl_methd_name);
 590       return false;
 591    }
 592
 593    if (index >= ctx->Const.MaxTransformFeedbackBuffers) {
 594       /* OpenGL 4.5 core profile, 6.1, pdf page 82: "An INVALID_VALUE error is
 595        * generated if index is greater than or equal to the number of binding
 596        * points for transform feedback, as described in section 6.7.1."
 597        */
 598       _mesa_error(ctx, GL_INVALID_VALUE, "%s(index=%d out of bounds)",
 599                   gl_methd_name, index);
 600       return false;
 601    }
 602
 603    if (size & 0x3) {
 604       /* OpenGL 4.5 core profile, 6.7, pdf page 103: multiple of 4 */
 605       _mesa_error(ctx, GL_INVALID_VALUE, "%s(size=%d must be a multiple of "
 606                   "four)", gl_methd_name, (int) size);
 607       return false;
 608    }
 609
 610    if (offset & 0x3) {
 611       /* OpenGL 4.5 core profile, 6.7, pdf page 103: multiple of 4 */
 612       _mesa_error(ctx, GL_INVALID_VALUE, "%s(offset=%d must be a multiple "
 613                   "of four)", gl_methd_name, (int) offset);
 614       return false;
 615    }
 616
 617    if (offset < 0) {
 618       /* OpenGL 4.5 core profile, 6.1, pdf page 82: "An INVALID_VALUE error is
 619        * generated by BindBufferRange if offset is negative."
 620        *
 621        * OpenGL 4.5 core profile, 13.2, pdf page 445: "An INVALID_VALUE error
 622        * is generated by TransformFeedbackBufferRange if offset is negative."
 623        */
 624       _mesa_error(ctx, GL_INVALID_VALUE, "%s(offset=%d must be >= 0)",
 625                   gl_methd_name,
 626                   (int) offset);
 627       return false;
 628    }
 629
 630    if (size <= 0 && (dsa || bufObj != ctx->Shared->NullBufferObj)) {
 631       /* OpenGL 4.5 core profile, 6.1, pdf page 82: "An INVALID_VALUE error is
 632        * generated by BindBufferRange if buffer is non-zero and size is less
 633        * than or equal to zero."
 634        *
 635        * OpenGL 4.5 core profile, 13.2, pdf page 445: "An INVALID_VALUE error
 636        * is generated by TransformFeedbackBufferRange if size is less than or
 637        * equal to zero."
 638        */
 639       _mesa_error(ctx, GL_INVALID_VALUE, "%s(size=%d must be > 0)",
 640                   gl_methd_name, (int) size);
 641       return false;
 642    }
 643
 644    return true;
 645 }
 646
 647
 648 /**
 649  * Specify a buffer object to receive transform feedback results.
 650  * As above, but start at offset = 0.
 651  * Called from the glBindBufferBase() and glTransformFeedbackBufferBase()
 652  * functions.
 653  */
 654 void
 655 _mesa_bind_buffer_base_transform_feedback(struct gl_context *ctx,
 656                                           struct gl_transform_feedback_object *obj,
 657                                           GLuint index,
 658                                           struct gl_buffer_object *bufObj,
 659                                           bool dsa)
 660 {
 661    if (obj->Active) {
 662       _mesa_error(ctx, GL_INVALID_OPERATION,
 663                   "%s(transform feedback active)",
 664                   dsa ? "glTransformFeedbackBufferBase" : "glBindBufferBase");
 665       return;
 666    }
 667
 668    if (index >= ctx->Const.MaxTransformFeedbackBuffers) {
 669       _mesa_error(ctx, GL_INVALID_VALUE, "%s(index=%d out of bounds)",
 670                   dsa ? "glTransformFeedbackBufferBase" : "glBindBufferBase",
 671                   index);
 672       return;
 673    }
 674
 675    bind_buffer_range(ctx, obj, index, bufObj, 0, 0, dsa);
 676 }
 677
 678 /**
 679  * Wrapper around lookup_transform_feedback_object that throws
 680  * GL_INVALID_OPERATION if id is not in the hash table. After calling
 681  * _mesa_error, it returns NULL.
 682  */
 683 static struct gl_transform_feedback_object *
 684 lookup_transform_feedback_object_err(struct gl_context *ctx,
 685                                      GLuint xfb, const char* func)
 686 {
 687    struct gl_transform_feedback_object *obj;
 688
 689    obj = _mesa_lookup_transform_feedback_object(ctx, xfb);
 690    if (!obj) {
 691       _mesa_error(ctx, GL_INVALID_OPERATION,
 692                   "%s(xfb=%u: non-generated object name)", func, xfb);
 693    }
 694
 695    return obj;
 696 }
 697
 698 /**
 699  * Wrapper around _mesa_lookup_bufferobj that throws GL_INVALID_VALUE if id
 700  * is not in the hash table. Specialised version for the
 701  * transform-feedback-related functions. After calling _mesa_error, it
 702  * returns NULL.
 703  */
 704 static struct gl_buffer_object *
 705 lookup_transform_feedback_bufferobj_err(struct gl_context *ctx,
 706                                         GLuint buffer, const char* func)
 707 {
 708    struct gl_buffer_object *bufObj;
 709
 710    /* OpenGL 4.5 core profile, 13.2, pdf page 444: buffer must be zero or the
 711     * name of an existing buffer object.
 712     */
 713    if (buffer == 0) {
 714       bufObj = ctx->Shared->NullBufferObj;
 715    } else {
 716       bufObj = _mesa_lookup_bufferobj(ctx, buffer);
 717       if (!bufObj) {
 718          _mesa_error(ctx, GL_INVALID_VALUE, "%s(invalid buffer=%u)", func,
 719                      buffer);
 720       }
 721    }
 722
 723    return bufObj;
 724 }
 725
 726 void GLAPIENTRY
 727 _mesa_TransformFeedbackBufferBase(GLuint xfb, GLuint index, GLuint buffer)
 728 {
 729    GET_CURRENT_CONTEXT(ctx);
 730    struct gl_transform_feedback_object *obj;
 731    struct gl_buffer_object *bufObj;
 732
 733    obj = lookup_transform_feedback_object_err(ctx, xfb,
 734                                               "glTransformFeedbackBufferBase");
 735    if(!obj) {
 736       return;
 737    }
 738
 739    bufObj = lookup_transform_feedback_bufferobj_err(ctx, buffer,
 740                                               "glTransformFeedbackBufferBase");
 741    if(!bufObj) {
 742       return;
 743    }
 744
 745    _mesa_bind_buffer_base_transform_feedback(ctx, obj, index, bufObj, true);
 746 }
 747
 748 void GLAPIENTRY
 749 _mesa_TransformFeedbackBufferRange(GLuint xfb, GLuint index, GLuint buffer,
 750                                    GLintptr offset, GLsizeiptr size)
 751 {
 752    GET_CURRENT_CONTEXT(ctx);
 753    struct gl_transform_feedback_object *obj;
 754    struct gl_buffer_object *bufObj;
 755
 756    obj = lookup_transform_feedback_object_err(ctx, xfb,
 757                                               "glTransformFeedbackBufferRange");
 758    if(!obj) {
 759       return;
 760    }
 761
 762    bufObj = lookup_transform_feedback_bufferobj_err(ctx, buffer,
 763                                               "glTransformFeedbackBufferRange");
 764    if(!bufObj) {
 765       return;
 766    }
 767
 768    if (!_mesa_validate_buffer_range_xfb(ctx, obj, index, bufObj, offset,
 769                                         size, true))
 770       return;
 771
 772    /* The per-attribute binding point */
 773    _mesa_set_transform_feedback_binding(ctx, obj, index, bufObj, offset,
 774                                         size);
 775 }
 776
 777 /**
 778  * Specify a buffer object to receive transform feedback results, plus the
 779  * offset in the buffer to start placing results.
 780  * This function is part of GL_EXT_transform_feedback, but not GL3.
 781  */
 782 void GLAPIENTRY
 783 _mesa_BindBufferOffsetEXT(GLenum target, GLuint index, GLuint buffer,
 784                           GLintptr offset)
 785 {
 786    struct gl_transform_feedback_object *obj;
 787    struct gl_buffer_object *bufObj;
 788    GET_CURRENT_CONTEXT(ctx);
 789
 790    if (target != GL_TRANSFORM_FEEDBACK_BUFFER) {
 791       _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferOffsetEXT(target)");
 792       return;
 793    }
 794
 795    obj = ctx->TransformFeedback.CurrentObject;
 796
 797    if (obj->Active) {
 798       _mesa_error(ctx, GL_INVALID_OPERATION,
 799                   "glBindBufferOffsetEXT(transform feedback active)");
 800       return;
 801    }
 802
 803    if (index >= ctx->Const.MaxTransformFeedbackBuffers) {
 804       _mesa_error(ctx, GL_INVALID_VALUE,
 805                   "glBindBufferOffsetEXT(index=%d)", index);
 806       return;
 807    }
 808
 809    if (offset & 0x3) {
 810       /* must be multiple of four */
 811       _mesa_error(ctx, GL_INVALID_VALUE,
 812                   "glBindBufferOffsetEXT(offset=%d)", (int) offset);
 813       return;
 814    }
 815
 816    if (buffer == 0) {
 817       bufObj = ctx->Shared->NullBufferObj;
 818    } else {
 819       bufObj = _mesa_lookup_bufferobj(ctx, buffer);
 820       if (!bufObj) {
 821          _mesa_error(ctx, GL_INVALID_OPERATION,
 822                      "glBindBufferOffsetEXT(invalid buffer=%u)", buffer);
 823          return;
 824       }
 825    }
 826
 827    _mesa_bind_buffer_range_xfb(ctx, obj, index, bufObj, offset, 0);
 828 }
 829
 830
 831 /**
 832  * This function specifies the transform feedback outputs to be written
 833  * to the feedback buffer(s), and in what order.
 834  */
 835 static ALWAYS_INLINE void
 836 transform_feedback_varyings(struct gl_context *ctx,
 837                             struct gl_shader_program *shProg, GLsizei count,
 838                             const GLchar *const *varyings, GLenum bufferMode)
 839 {
 840    GLint i;
 841
 842    /* free existing varyings, if any */
 843    for (i = 0; i < (GLint) shProg->TransformFeedback.NumVarying; i++) {
 844       free(shProg->TransformFeedback.VaryingNames[i]);
 845    }
 846    free(shProg->TransformFeedback.VaryingNames);
 847
 848    /* allocate new memory for varying names */
 849    shProg->TransformFeedback.VaryingNames =
 850       malloc(count * sizeof(GLchar *));
 851
 852    if (!shProg->TransformFeedback.VaryingNames) {
 853       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glTransformFeedbackVaryings()");
 854       return;
 855    }
 856
 857    /* Save the new names and the count */
 858    for (i = 0; i < count; i++) {
 859       shProg->TransformFeedback.VaryingNames[i] = strdup(varyings[i]);
 860    }
 861    shProg->TransformFeedback.NumVarying = count;
 862
 863    shProg->TransformFeedback.BufferMode = bufferMode;
 864
 865    /* No need to invoke FLUSH_VERTICES or flag NewTransformFeedback since
 866     * the varyings won't be used until shader link time.
 867     */
 868 }
 869
 870
 871 void GLAPIENTRY
 872 _mesa_TransformFeedbackVaryings_no_error(GLuint program, GLsizei count,
 873                                          const GLchar *const *varyings,
 874                                          GLenum bufferMode)
 875 {
 876    GET_CURRENT_CONTEXT(ctx);
 877
 878    struct gl_shader_program *shProg = _mesa_lookup_shader_program(ctx, program);
 879    transform_feedback_varyings(ctx, shProg, count, varyings, bufferMode);
 880 }
 881
 882 void GLAPIENTRY
 883 _mesa_TransformFeedbackVaryings(GLuint program, GLsizei count,
 884                                 const GLchar * const *varyings,
 885                                 GLenum bufferMode)
 886 {
 887    struct gl_shader_program *shProg;
 888    GLint i;
 889    GET_CURRENT_CONTEXT(ctx);
 890
 891    /* From the ARB_transform_feedback2 specification:
 892     * "The error INVALID_OPERATION is generated by TransformFeedbackVaryings
 893     *  if the current transform feedback object is active, even if paused."
 894     */
 895    if (ctx->TransformFeedback.CurrentObject->Active) {
 896       _mesa_error(ctx, GL_INVALID_OPERATION,
 897                "glTransformFeedbackVaryings(current object is active)");
 898       return;
 899    }
 900
 901    switch (bufferMode) {
 902    case GL_INTERLEAVED_ATTRIBS:
 903       break;
 904    case GL_SEPARATE_ATTRIBS:
 905       break;
 906    default:
 907       _mesa_error(ctx, GL_INVALID_ENUM,
 908                   "glTransformFeedbackVaryings(bufferMode)");
 909       return;
 910    }
 911
 912    if (count < 0 ||
 913        (bufferMode == GL_SEPARATE_ATTRIBS &&
 914         (GLuint) count > ctx->Const.MaxTransformFeedbackBuffers)) {
 915       _mesa_error(ctx, GL_INVALID_VALUE,
 916                   "glTransformFeedbackVaryings(count=%d)", count);
 917       return;
 918    }
 919
 920    shProg = _mesa_lookup_shader_program_err(ctx, program,
 921                                             "glTransformFeedbackVaryings");
 922    if (!shProg)
 923       return;
 924
 925    if (ctx->Extensions.ARB_transform_feedback3) {
 926       if (bufferMode == GL_INTERLEAVED_ATTRIBS) {
 927          unsigned buffers = 1;
 928
 929          for (i = 0; i < count; i++) {
 930             if (strcmp(varyings[i], "gl_NextBuffer") == 0)
 931                buffers++;
 932          }
 933
 934          if (buffers > ctx->Const.MaxTransformFeedbackBuffers) {
 935             _mesa_error(ctx, GL_INVALID_OPERATION,
 936                         "glTransformFeedbackVaryings(too many gl_NextBuffer "
 937                         "occurrences)");
 938             return;
 939          }
 940       } else {
 941          for (i = 0; i < count; i++) {
 942             if (strcmp(varyings[i], "gl_NextBuffer") == 0 ||
 943                 strcmp(varyings[i], "gl_SkipComponents1") == 0 ||
 944                 strcmp(varyings[i], "gl_SkipComponents2") == 0 ||
 945                 strcmp(varyings[i], "gl_SkipComponents3") == 0 ||
 946                 strcmp(varyings[i], "gl_SkipComponents4") == 0) {
 947                _mesa_error(ctx, GL_INVALID_OPERATION,
 948                            "glTransformFeedbackVaryings(SEPARATE_ATTRIBS,"
 949                            "varying=%s)",
 950                            varyings[i]);
 951                return;
 952             }
 953          }
 954       }
 955    }
 956
 957    transform_feedback_varyings(ctx, shProg, count, varyings, bufferMode);
 958 }
 959
 960
 961 /**
 962  * Get info about the transform feedback outputs which are to be written
 963  * to the feedback buffer(s).
 964  */
 965 void GLAPIENTRY
 966 _mesa_GetTransformFeedbackVarying(GLuint program, GLuint index,
 967                                   GLsizei bufSize, GLsizei *length,
 968                                   GLsizei *size, GLenum *type, GLchar *name)
 969 {
 970    const struct gl_shader_program *shProg;
 971    struct gl_program_resource *res;
 972    GET_CURRENT_CONTEXT(ctx);
 973
 974    shProg = _mesa_lookup_shader_program_err(ctx, program,
 975                                             "glGetTransformFeedbackVarying");
 976    if (!shProg)
 977       return;
 978
 979    res = _mesa_program_resource_find_index((struct gl_shader_program *) shProg,
 980                                            GL_TRANSFORM_FEEDBACK_VARYING,
 981                                            index);
 982    if (!res) {
 983       _mesa_error(ctx, GL_INVALID_VALUE,
 984                   "glGetTransformFeedbackVarying(index=%u)", index);
 985       return;
 986    }
 987
 988    /* return the varying's name and length */
 989    _mesa_copy_string(name, bufSize, length, _mesa_program_resource_name(res));
 990
 991    /* return the datatype and value's size (in datatype units) */
 992    if (type)
 993       _mesa_program_resource_prop((struct gl_shader_program *) shProg,
 994                                   res, index, GL_TYPE, (GLint*) type,
 995                                   "glGetTransformFeedbackVarying");
 996    if (size)
 997       _mesa_program_resource_prop((struct gl_shader_program *) shProg,
 998                                   res, index, GL_ARRAY_SIZE, (GLint*) size,
 999                                   "glGetTransformFeedbackVarying");
1000 }
1001
1002
1003
1004 struct gl_transform_feedback_object *
1005 _mesa_lookup_transform_feedback_object(struct gl_context *ctx, GLuint name)
1006 {
1007    /* OpenGL 4.5 core profile, 13.2 pdf page 444: "xfb must be zero, indicating
1008     * the default transform feedback object, or the name of an existing
1009     * transform feedback object."
1010     */
1011    if (name == 0) {
1012       return ctx->TransformFeedback.DefaultObject;
1013    }
1014    else
1015       return (struct gl_transform_feedback_object *)
1016          _mesa_HashLookupLocked(ctx->TransformFeedback.Objects, name);
1017 }
1018
1019 static void
1020 create_transform_feedbacks(struct gl_context *ctx, GLsizei n, GLuint *ids,
1021                            bool dsa)
1022 {
1023    GLuint first;
1024    const char* func;
1025
1026    if (dsa)
1027       func = "glCreateTransformFeedbacks";
1028    else
1029       func = "glGenTransformFeedbacks";
1030
1031    if (n < 0) {
1032       _mesa_error(ctx, GL_INVALID_VALUE, "%s(n < 0)", func);
1033       return;
1034    }
1035
1036    if (!ids)
1037       return;
1038
1039    /* we don't need contiguous IDs, but this might be faster */
1040    first = _mesa_HashFindFreeKeyBlock(ctx->TransformFeedback.Objects, n);
1041    if (first) {
1042       GLsizei i;
1043       for (i = 0; i < n; i++) {
1044          struct gl_transform_feedback_object *obj
1045             = ctx->Driver.NewTransformFeedback(ctx, first + i);
1046          if (!obj) {
1047             _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s", func);
1048             return;
1049          }
1050          ids[i] = first + i;
1051          _mesa_HashInsertLocked(ctx->TransformFeedback.Objects, first + i,
1052                                 obj);
1053          if (dsa) {
1054             /* this is normally done at bind time in the non-dsa case */
1055             obj->EverBound = GL_TRUE;
1056          }
1057       }
1058    }
1059    else {
1060       _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s", func);
1061    }
1062 }
1063
1064 /**
1065  * Create new transform feedback objects.   Transform feedback objects
1066  * encapsulate the state related to transform feedback to allow quickly
1067  * switching state (and drawing the results, below).
1068  * Part of GL_ARB_transform_feedback2.
1069  */
1070 void GLAPIENTRY
1071 _mesa_GenTransformFeedbacks(GLsizei n, GLuint *names)
1072 {
1073    GET_CURRENT_CONTEXT(ctx);
1074
1075    /* GenTransformFeedbacks should just reserve the object names that a
1076     * subsequent call to BindTransformFeedback should actively create. For
1077     * the sake of simplicity, we reserve the names and create the objects
1078     * straight away.
1079     */
1080
1081    create_transform_feedbacks(ctx, n, names, false);
1082 }
1083
1084 /**
1085  * Create new transform feedback objects.   Transform feedback objects
1086  * encapsulate the state related to transform feedback to allow quickly
1087  * switching state (and drawing the results, below).
1088  * Part of GL_ARB_direct_state_access.
1089  */
1090 void GLAPIENTRY
1091 _mesa_CreateTransformFeedbacks(GLsizei n, GLuint *names)
1092 {
1093    GET_CURRENT_CONTEXT(ctx);
1094
1095    create_transform_feedbacks(ctx, n, names, true);
1096 }
1097
1098
1099 /**
1100  * Is the given ID a transform feedback object?
1101  * Part of GL_ARB_transform_feedback2.
1102  */
1103 GLboolean GLAPIENTRY
1104 _mesa_IsTransformFeedback(GLuint name)
1105 {
1106    struct gl_transform_feedback_object *obj;
1107    GET_CURRENT_CONTEXT(ctx);
1108
1109    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
1110
1111    if (name == 0)
1112       return GL_FALSE;
1113
1114    obj = _mesa_lookup_transform_feedback_object(ctx, name);
1115    if (obj == NULL)
1116       return GL_FALSE;
1117
1118    return obj->EverBound;
1119 }
1120
1121
1122 /**
1123  * Bind the given transform feedback object.
1124  * Part of GL_ARB_transform_feedback2.
1125  */
1126 static ALWAYS_INLINE void
1127 bind_transform_feedback(struct gl_context *ctx, GLuint name, bool no_error)
1128 {
1129    struct gl_transform_feedback_object *obj;
1130
1131    obj = _mesa_lookup_transform_feedback_object(ctx, name);
1132    if (!no_error && !obj) {
1133       _mesa_error(ctx, GL_INVALID_OPERATION,
1134                   "glBindTransformFeedback(name=%u)", name);
1135       return;
1136    }
1137
1138    reference_transform_feedback_object(&ctx->TransformFeedback.CurrentObject,
1139                                        obj);
1140 }
1141
1142
1143 void GLAPIENTRY
1144 _mesa_BindTransformFeedback_no_error(GLenum target, GLuint name)
1145 {
1146    GET_CURRENT_CONTEXT(ctx);
1147    bind_transform_feedback(ctx, name, true);
1148 }
1149
1150
1151 void GLAPIENTRY
1152 _mesa_BindTransformFeedback(GLenum target, GLuint name)
1153 {
1154    GET_CURRENT_CONTEXT(ctx);
1155
1156    if (target != GL_TRANSFORM_FEEDBACK) {
1157       _mesa_error(ctx, GL_INVALID_ENUM, "glBindTransformFeedback(target)");
1158       return;
1159    }
1160
1161    if (_mesa_is_xfb_active_and_unpaused(ctx)) {
1162       _mesa_error(ctx, GL_INVALID_OPERATION,
1163               "glBindTransformFeedback(transform is active, or not paused)");
1164       return;
1165    }
1166
1167    bind_transform_feedback(ctx, name, false);
1168 }
1169
1170
1171 /**
1172  * Delete the given transform feedback objects.
1173  * Part of GL_ARB_transform_feedback2.
1174  */
1175 void GLAPIENTRY
1176 _mesa_DeleteTransformFeedbacks(GLsizei n, const GLuint *names)
1177 {
1178    GLint i;
1179    GET_CURRENT_CONTEXT(ctx);
1180
1181    if (n < 0) {
1182       _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteTransformFeedbacks(n < 0)");
1183       return;
1184    }
1185
1186    if (!names)
1187       return;
1188
1189    for (i = 0; i < n; i++) {
1190       if (names[i] > 0) {
1191          struct gl_transform_feedback_object *obj
1192             = _mesa_lookup_transform_feedback_object(ctx, names[i]);
1193          if (obj) {
1194             if (obj->Active) {
1195                _mesa_error(ctx, GL_INVALID_OPERATION,
1196                            "glDeleteTransformFeedbacks(object %u is active)",
1197                            names[i]);
1198                return;
1199             }
1200             _mesa_HashRemoveLocked(ctx->TransformFeedback.Objects, names[i]);
1201             /* unref, but object may not be deleted until later */
1202             if (obj == ctx->TransformFeedback.CurrentObject) {
1203                reference_transform_feedback_object(
1204                      &ctx->TransformFeedback.CurrentObject,
1205                      ctx->TransformFeedback.DefaultObject);
1206             }
1207             reference_transform_feedback_object(&obj, NULL);
1208          }
1209       }
1210    }
1211 }
1212
1213
1214 /**
1215  * Pause transform feedback.
1216  * Part of GL_ARB_transform_feedback2.
1217  */
1218 static void
1219 pause_transform_feedback(struct gl_context *ctx,
1220                          struct gl_transform_feedback_object *obj)
1221 {
1222    FLUSH_VERTICES(ctx, 0);
1223    ctx->NewDriverState |= ctx->DriverFlags.NewTransformFeedback;
1224
1225    assert(ctx->Driver.PauseTransformFeedback);
1226    ctx->Driver.PauseTransformFeedback(ctx, obj);
1227
1228    obj->Paused = GL_TRUE;
1229 }
1230
1231
1232 void GLAPIENTRY
1233 _mesa_PauseTransformFeedback_no_error(void)
1234 {
1235    GET_CURRENT_CONTEXT(ctx);
1236    pause_transform_feedback(ctx, ctx->TransformFeedback.CurrentObject);
1237 }
1238
1239
1240 void GLAPIENTRY
1241 _mesa_PauseTransformFeedback(void)
1242 {
1243    struct gl_transform_feedback_object *obj;
1244    GET_CURRENT_CONTEXT(ctx);
1245
1246    obj = ctx->TransformFeedback.CurrentObject;
1247
1248    if (!_mesa_is_xfb_active_and_unpaused(ctx)) {
1249       _mesa_error(ctx, GL_INVALID_OPERATION,
1250            "glPauseTransformFeedback(feedback not active or already paused)");
1251       return;
1252    }
1253
1254    pause_transform_feedback(ctx, obj);
1255 }
1256
1257
1258 /**
1259  * Resume transform feedback.
1260  * Part of GL_ARB_transform_feedback2.
1261  */
1262 static void
1263 resume_transform_feedback(struct gl_context *ctx,
1264                           struct gl_transform_feedback_object *obj)
1265 {
1266    FLUSH_VERTICES(ctx, 0);
1267    ctx->NewDriverState |= ctx->DriverFlags.NewTransformFeedback;
1268
1269    obj->Paused = GL_FALSE;
1270
1271    assert(ctx->Driver.ResumeTransformFeedback);
1272    ctx->Driver.ResumeTransformFeedback(ctx, obj);
1273 }
1274
1275
1276 void GLAPIENTRY
1277 _mesa_ResumeTransformFeedback_no_error(void)
1278 {
1279    GET_CURRENT_CONTEXT(ctx);
1280    resume_transform_feedback(ctx, ctx->TransformFeedback.CurrentObject);
1281 }
1282
1283
1284 void GLAPIENTRY
1285 _mesa_ResumeTransformFeedback(void)
1286 {
1287    struct gl_transform_feedback_object *obj;
1288    GET_CURRENT_CONTEXT(ctx);
1289
1290    obj = ctx->TransformFeedback.CurrentObject;
1291
1292    if (!obj->Active || !obj->Paused) {
1293       _mesa_error(ctx, GL_INVALID_OPERATION,
1294                "glResumeTransformFeedback(feedback not active or not paused)");
1295       return;
1296    }
1297
1298    /* From the ARB_transform_feedback2 specification:
1299     * "The error INVALID_OPERATION is generated by ResumeTransformFeedback if
1300     *  the program object being used by the current transform feedback object
1301     *  is not active."
1302     */
1303    if (obj->program != get_xfb_source(ctx)) {
1304       _mesa_error(ctx, GL_INVALID_OPERATION,
1305                   "glResumeTransformFeedback(wrong program bound)");
1306       return;
1307    }
1308
1309    resume_transform_feedback(ctx, obj);
1310 }
1311
1312 extern void GLAPIENTRY
1313 _mesa_GetTransformFeedbackiv(GLuint xfb, GLenum pname, GLint *param)
1314 {
1315     struct gl_transform_feedback_object *obj;
1316     GET_CURRENT_CONTEXT(ctx);
1317
1318     obj = lookup_transform_feedback_object_err(ctx, xfb,
1319                                                "glGetTransformFeedbackiv");
1320     if(!obj) {
1321        return;
1322     }
1323
1324     switch(pname) {
1325     case GL_TRANSFORM_FEEDBACK_PAUSED:
1326        *param = obj->Paused;
1327        break;
1328     case GL_TRANSFORM_FEEDBACK_ACTIVE:
1329        *param = obj->Active;
1330        break;
1331     default:
1332        _mesa_error(ctx, GL_INVALID_ENUM,
1333                    "glGetTransformFeedbackiv(pname=%i)", pname);
1334     }
1335 }
1336
1337 extern void GLAPIENTRY
1338 _mesa_GetTransformFeedbacki_v(GLuint xfb, GLenum pname, GLuint index,
1339                               GLint *param)
1340 {
1341    struct gl_transform_feedback_object *obj;
1342    GET_CURRENT_CONTEXT(ctx);
1343
1344    obj = lookup_transform_feedback_object_err(ctx, xfb,
1345                                               "glGetTransformFeedbacki_v");
1346    if(!obj) {
1347       return;
1348    }
1349
1350    if (index >= ctx->Const.MaxTransformFeedbackBuffers) {
1351       _mesa_error(ctx, GL_INVALID_VALUE,
1352                   "glGetTransformFeedbacki_v(index=%i)", index);
1353       return;
1354    }
1355
1356    switch(pname) {
1357    case GL_TRANSFORM_FEEDBACK_BUFFER_BINDING:
1358       *param = obj->BufferNames[index];
1359       break;
1360    default:
1361       _mesa_error(ctx, GL_INVALID_ENUM,
1362                   "glGetTransformFeedbacki_v(pname=%i)", pname);
1363    }
1364 }
1365
1366 extern void GLAPIENTRY
1367 _mesa_GetTransformFeedbacki64_v(GLuint xfb, GLenum pname, GLuint index,
1368                                 GLint64 *param)
1369 {
1370    struct gl_transform_feedback_object *obj;
1371    GET_CURRENT_CONTEXT(ctx);
1372
1373    obj = lookup_transform_feedback_object_err(ctx, xfb,
1374                                               "glGetTransformFeedbacki64_v");
1375    if(!obj) {
1376       return;
1377    }
1378
1379    if (index >= ctx->Const.MaxTransformFeedbackBuffers) {
1380       _mesa_error(ctx, GL_INVALID_VALUE,
1381                   "glGetTransformFeedbacki64_v(index=%i)", index);
1382       return;
1383    }
1384
1385    compute_transform_feedback_buffer_sizes(obj);
1386    switch(pname) {
1387    case GL_TRANSFORM_FEEDBACK_BUFFER_START:
1388       *param = obj->Offset[index];
1389       break;
1390    case GL_TRANSFORM_FEEDBACK_BUFFER_SIZE:
1391       *param = obj->Size[index];
1392       break;
1393    default:
1394       _mesa_error(ctx, GL_INVALID_ENUM,
1395                   "glGetTransformFeedbacki64_v(pname=%i)", pname);
1396    }
1397 }