src/mesa/tnl/t_draw.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2007  Brian Paul   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  * Authors:
  25  *    Keith Whitwell <keithw@vmware.com>
  26  */
  27
  28 #include <stdio.h>
  29
  30 #include "main/glheader.h"
  31 #include "main/arrayobj.h"
  32 #include "main/bufferobj.h"
  33 #include "main/condrender.h"
  34 #include "main/context.h"
  35 #include "main/imports.h"
  36 #include "main/mtypes.h"
  37 #include "main/macros.h"
  38 #include "main/enums.h"
  39 #include "main/varray.h"
  40 #include "util/half_float.h"
  41
  42 #include "t_context.h"
  43 #include "t_rebase.h"
  44 #include "tnl.h"
  45
  46
  47
  48 static GLubyte *get_space(struct gl_context *ctx, GLuint bytes)
  49 {
  50    TNLcontext *tnl = TNL_CONTEXT(ctx);
  51    GLubyte *space = malloc(bytes);
  52
  53    tnl->block[tnl->nr_blocks++] = space;
  54    return space;
  55 }
  56
  57
  58 static void free_space(struct gl_context *ctx)
  59 {
  60    TNLcontext *tnl = TNL_CONTEXT(ctx);
  61    GLuint i;
  62    for (i = 0; i < tnl->nr_blocks; i++)
  63       free(tnl->block[i]);
  64    tnl->nr_blocks = 0;
  65 }
  66
  67
  68 /* Convert the incoming array to GLfloats.  Understands the
  69  * array->Normalized flag and selects the correct conversion method.
  70  */
  71 #define CONVERT( TYPE, MACRO ) do {             \
  72    GLuint i, j;                                 \
  73    if (attrib->Normalized) {                    \
  74       for (i = 0; i < count; i++) {             \
  75          const TYPE *in = (TYPE *)ptr;          \
  76          for (j = 0; j < sz; j++) {             \
  77             *fptr++ = MACRO(*in);               \
  78             in++;                               \
  79          }                                      \
  80          ptr += binding->Stride;                \
  81       }                                         \
  82    } else {                                     \
  83       for (i = 0; i < count; i++) {             \
  84          const TYPE *in = (TYPE *)ptr;          \
  85          for (j = 0; j < sz; j++) {             \
  86             *fptr++ = (GLfloat)(*in);           \
  87             in++;                               \
  88          }                                      \
  89          ptr += binding->Stride;                \
  90       }                                         \
  91    }                                            \
  92 } while (0)
  93
  94
  95 /**
  96  * Convert array of BGRA/GLubyte[4] values to RGBA/float[4]
  97  * \param ptr  input/ubyte array
  98  * \param fptr  output/float array
  99  */
 100 static void
 101 convert_bgra_to_float(const struct gl_vertex_buffer_binding *binding,
 102                       const struct gl_array_attributes *attrib,
 103                       const GLubyte *ptr, GLfloat *fptr,
 104                       GLuint count )
 105 {
 106    GLuint i;
 107    assert(attrib->Normalized);
 108    assert(attrib->Size == 4);
 109    for (i = 0; i < count; i++) {
 110       const GLubyte *in = (GLubyte *) ptr;  /* in is in BGRA order */
 111       *fptr++ = UBYTE_TO_FLOAT(in[2]);  /* red */
 112       *fptr++ = UBYTE_TO_FLOAT(in[1]);  /* green */
 113       *fptr++ = UBYTE_TO_FLOAT(in[0]);  /* blue */
 114       *fptr++ = UBYTE_TO_FLOAT(in[3]);  /* alpha */
 115       ptr += binding->Stride;
 116    }
 117 }
 118
 119 static void
 120 convert_half_to_float(const struct gl_vertex_buffer_binding *binding,
 121                       const struct gl_array_attributes *attrib,
 122                       const GLubyte *ptr, GLfloat *fptr,
 123                       GLuint count, GLuint sz)
 124 {
 125    GLuint i, j;
 126
 127    for (i = 0; i < count; i++) {
 128       GLhalfARB *in = (GLhalfARB *)ptr;
 129
 130       for (j = 0; j < sz; j++) {
 131          *fptr++ = _mesa_half_to_float(in[j]);
 132       }
 133       ptr += binding->Stride;
 134    }
 135 }
 136
 137 /**
 138  * \brief Convert fixed-point to floating-point.
 139  *
 140  * In OpenGL, a fixed-point number is a "signed 2's complement 16.16 scaled
 141  * integer" (Table 2.2 of the OpenGL ES 2.0 spec).
 142  *
 143  * If the buffer has the \c normalized flag set, the formula
 144  *     \code normalize(x) := (2*x + 1) / (2^16 - 1) \endcode
 145  * is used to map the fixed-point numbers into the range [-1, 1].
 146  */
 147 static void
 148 convert_fixed_to_float(const struct gl_vertex_buffer_binding *binding,
 149                        const struct gl_array_attributes *attrib,
 150                        const GLubyte *ptr, GLfloat *fptr,
 151                        GLuint count)
 152 {
 153    GLuint i;
 154    GLint j;
 155    const GLint size = attrib->Size;
 156
 157    if (attrib->Normalized) {
 158       for (i = 0; i < count; ++i) {
 159          const GLfixed *in = (GLfixed *) ptr;
 160          for (j = 0; j < size; ++j) {
 161             *fptr++ = (GLfloat) (2 * in[j] + 1) / (GLfloat) ((1 << 16) - 1);
 162          }
 163          ptr += binding->Stride;
 164       }
 165    } else {
 166       for (i = 0; i < count; ++i) {
 167          const GLfixed *in = (GLfixed *) ptr;
 168          for (j = 0; j < size; ++j) {
 169             *fptr++ = in[j] / (GLfloat) (1 << 16);
 170          }
 171          ptr += binding->Stride;
 172       }
 173    }
 174 }
 175
 176 /* Adjust pointer to point at first requested element, convert to
 177  * floating point, populate VB->AttribPtr[].
 178  */
 179 static void _tnl_import_array( struct gl_context *ctx,
 180                                GLuint attr,
 181                                GLuint count,
 182                                const struct gl_vertex_buffer_binding *binding,
 183                                const struct gl_array_attributes *attrib,
 184                                const GLubyte *ptr )
 185 {
 186    TNLcontext *tnl = TNL_CONTEXT(ctx);
 187    struct vertex_buffer *VB = &tnl->vb;
 188    GLuint stride = binding->Stride;
 189
 190    if (attrib->Type != GL_FLOAT) {
 191       const GLuint sz = attrib->Size;
 192       GLubyte *buf = get_space(ctx, count * sz * sizeof(GLfloat));
 193       GLfloat *fptr = (GLfloat *)buf;
 194
 195       switch (attrib->Type) {
 196       case GL_BYTE:
 197          CONVERT(GLbyte, BYTE_TO_FLOAT);
 198          break;
 199       case GL_UNSIGNED_BYTE:
 200          if (attrib->Format == GL_BGRA) {
 201             /* See GL_EXT_vertex_array_bgra */
 202             convert_bgra_to_float(binding, attrib, ptr, fptr, count);
 203          }
 204          else {
 205             CONVERT(GLubyte, UBYTE_TO_FLOAT);
 206          }
 207          break;
 208       case GL_SHORT:
 209          CONVERT(GLshort, SHORT_TO_FLOAT);
 210          break;
 211       case GL_UNSIGNED_SHORT:
 212          CONVERT(GLushort, USHORT_TO_FLOAT);
 213          break;
 214       case GL_INT:
 215          CONVERT(GLint, INT_TO_FLOAT);
 216          break;
 217       case GL_UNSIGNED_INT:
 218          CONVERT(GLuint, UINT_TO_FLOAT);
 219          break;
 220       case GL_DOUBLE:
 221          CONVERT(GLdouble, (GLfloat));
 222          break;
 223       case GL_HALF_FLOAT:
 224          convert_half_to_float(binding, attrib, ptr, fptr, count, sz);
 225          break;
 226       case GL_FIXED:
 227          convert_fixed_to_float(binding, attrib, ptr, fptr, count);
 228          break;
 229       default:
 230          assert(0);
 231          break;
 232       }
 233
 234       ptr = buf;
 235       stride = sz * sizeof(GLfloat);
 236    }
 237
 238    VB->AttribPtr[attr] = &tnl->tmp_inputs[attr];
 239    VB->AttribPtr[attr]->data = (GLfloat (*)[4])ptr;
 240    VB->AttribPtr[attr]->start = (GLfloat *)ptr;
 241    VB->AttribPtr[attr]->count = count;
 242    VB->AttribPtr[attr]->stride = stride;
 243    VB->AttribPtr[attr]->size = attrib->Size;
 244
 245    /* This should die, but so should the whole GLvector4f concept:
 246     */
 247    VB->AttribPtr[attr]->flags = (((1<<attrib->Size)-1) |
 248                                    VEC_NOT_WRITEABLE |
 249                                    (stride == 4*sizeof(GLfloat) ? 0 : VEC_BAD_STRIDE));
 250
 251    VB->AttribPtr[attr]->storage = NULL;
 252 }
 253
 254 #define CLIPVERTS  ((6 + MAX_CLIP_PLANES) * 2)
 255
 256
 257 static GLboolean *_tnl_import_edgeflag( struct gl_context *ctx,
 258                                         const GLvector4f *input,
 259                                         GLuint count)
 260 {
 261    const GLubyte *ptr = (const GLubyte *)input->data;
 262    const GLuint stride = input->stride;
 263    GLboolean *space = (GLboolean *)get_space(ctx, count + CLIPVERTS);
 264    GLboolean *bptr = space;
 265    GLuint i;
 266
 267    for (i = 0; i < count; i++) {
 268       *bptr++ = ((GLfloat *)ptr)[0] == 1.0F;
 269       ptr += stride;
 270    }
 271
 272    return space;
 273 }
 274
 275
 276 static void bind_inputs( struct gl_context *ctx,
 277                          const struct tnl_vertex_array *inputs,
 278                          GLint count,
 279                          struct gl_buffer_object **bo,
 280                          GLuint *nr_bo )
 281 {
 282    TNLcontext *tnl = TNL_CONTEXT(ctx);
 283    struct vertex_buffer *VB = &tnl->vb;
 284    GLuint i;
 285
 286    /* Map all the VBOs
 287     */
 288    for (i = 0; i < VERT_ATTRIB_MAX; i++) {
 289       const struct tnl_vertex_array *array = &inputs[i];
 290       const struct gl_vertex_buffer_binding *binding = array->BufferBinding;
 291       const struct gl_array_attributes *attrib = array->VertexAttrib;
 292       const void *ptr;
 293
 294       if (_mesa_is_bufferobj(binding->BufferObj)) {
 295          if (!binding->BufferObj->Mappings[MAP_INTERNAL].Pointer) {
 296             bo[*nr_bo] = binding->BufferObj;
 297             (*nr_bo)++;
 298             ctx->Driver.MapBufferRange(ctx, 0, binding->BufferObj->Size,
 299                                        GL_MAP_READ_BIT,
 300                                        binding->BufferObj,
 301                                        MAP_INTERNAL);
 302
 303             assert(binding->BufferObj->Mappings[MAP_INTERNAL].Pointer);
 304          }
 305
 306          ptr = ADD_POINTERS(binding->BufferObj->Mappings[MAP_INTERNAL].Pointer,
 307                             binding->Offset + attrib->RelativeOffset);
 308       }
 309       else
 310          ptr = attrib->Ptr;
 311
 312       /* Just make sure the array is floating point, otherwise convert to
 313        * temporary storage.
 314        *
 315        * XXX: remove the GLvector4f type at some stage and just use
 316        * client arrays.
 317        */
 318       _tnl_import_array(ctx, i, count, binding, attrib, ptr);
 319    }
 320
 321    /* We process only the vertices between min & max index:
 322     */
 323    VB->Count = count;
 324
 325    /* These should perhaps be part of _TNL_ATTRIB_* */
 326    VB->BackfaceColorPtr = NULL;
 327    VB->BackfaceIndexPtr = NULL;
 328    VB->BackfaceSecondaryColorPtr = NULL;
 329
 330    /* Clipping and drawing code still requires this to be a packed
 331     * array of ubytes which can be written into.  TODO: Fix and
 332     * remove.
 333     */
 334    if (ctx->Polygon.FrontMode != GL_FILL ||
 335        ctx->Polygon.BackMode != GL_FILL)
 336    {
 337       VB->EdgeFlag = _tnl_import_edgeflag( ctx,
 338                                            VB->AttribPtr[_TNL_ATTRIB_EDGEFLAG],
 339                                            VB->Count );
 340    }
 341    else {
 342       /* the data previously pointed to by EdgeFlag may have been freed */
 343       VB->EdgeFlag = NULL;
 344    }
 345 }
 346
 347
 348 /* Translate indices to GLuints and store in VB->Elts.
 349  */
 350 static void bind_indices( struct gl_context *ctx,
 351                           const struct _mesa_index_buffer *ib,
 352                           struct gl_buffer_object **bo,
 353                           GLuint *nr_bo)
 354 {
 355    TNLcontext *tnl = TNL_CONTEXT(ctx);
 356    struct vertex_buffer *VB = &tnl->vb;
 357    GLuint i;
 358    const void *ptr;
 359
 360    if (!ib) {
 361       VB->Elts = NULL;
 362       return;
 363    }
 364
 365    if (_mesa_is_bufferobj(ib->obj) &&
 366        !_mesa_bufferobj_mapped(ib->obj, MAP_INTERNAL)) {
 367       /* if the buffer object isn't mapped yet, map it now */
 368       bo[*nr_bo] = ib->obj;
 369       (*nr_bo)++;
 370       ptr = ctx->Driver.MapBufferRange(ctx, (GLsizeiptr) ib->ptr,
 371                                        ib->count * ib->index_size,
 372                                        GL_MAP_READ_BIT, ib->obj,
 373                                        MAP_INTERNAL);
 374       assert(ib->obj->Mappings[MAP_INTERNAL].Pointer);
 375    } else {
 376       /* user-space elements, or buffer already mapped */
 377       ptr = ADD_POINTERS(ib->obj->Mappings[MAP_INTERNAL].Pointer, ib->ptr);
 378    }
 379
 380    if (ib->index_size == 4 && VB->Primitive[0].basevertex == 0) {
 381       VB->Elts = (GLuint *) ptr;
 382    }
 383    else {
 384       GLuint *elts = (GLuint *)get_space(ctx, ib->count * sizeof(GLuint));
 385       VB->Elts = elts;
 386
 387       if (ib->index_size == 4) {
 388          const GLuint *in = (GLuint *)ptr;
 389          for (i = 0; i < ib->count; i++)
 390             *elts++ = (GLuint)(*in++) + VB->Primitive[0].basevertex;
 391       }
 392       else if (ib->index_size == 2) {
 393          const GLushort *in = (GLushort *)ptr;
 394          for (i = 0; i < ib->count; i++)
 395             *elts++ = (GLuint)(*in++) + VB->Primitive[0].basevertex;
 396       }
 397       else {
 398          const GLubyte *in = (GLubyte *)ptr;
 399          for (i = 0; i < ib->count; i++)
 400             *elts++ = (GLuint)(*in++) + VB->Primitive[0].basevertex;
 401       }
 402    }
 403 }
 404
 405 static void bind_prims( struct gl_context *ctx,
 406                         const struct _mesa_prim *prim,
 407                         GLuint nr_prims )
 408 {
 409    TNLcontext *tnl = TNL_CONTEXT(ctx);
 410    struct vertex_buffer *VB = &tnl->vb;
 411
 412    VB->Primitive = prim;
 413    VB->PrimitiveCount = nr_prims;
 414 }
 415
 416 static void unmap_vbos( struct gl_context *ctx,
 417                         struct gl_buffer_object **bo,
 418                         GLuint nr_bo )
 419 {
 420    GLuint i;
 421    for (i = 0; i < nr_bo; i++) {
 422       ctx->Driver.UnmapBuffer(ctx, bo[i], MAP_INTERNAL);
 423    }
 424 }
 425
 426
 427 /* This is the main workhorse doing all the rendering work.
 428  */
 429 void _tnl_draw_prims(struct gl_context *ctx,
 430                      const struct tnl_vertex_array *arrays,
 431                          const struct _mesa_prim *prim,
 432                          GLuint nr_prims,
 433                          const struct _mesa_index_buffer *ib,
 434                          GLboolean index_bounds_valid,
 435                          GLuint min_index,
 436                          GLuint max_index,
 437                          struct gl_transform_feedback_object *tfb_vertcount,
 438                          unsigned stream,
 439                          struct gl_buffer_object *indirect)
 440 {
 441    TNLcontext *tnl = TNL_CONTEXT(ctx);
 442    const GLuint TEST_SPLIT = 0;
 443    const GLint max = TEST_SPLIT ? 8 : tnl->vb.Size - MAX_CLIPPED_VERTICES;
 444    GLint max_basevertex = prim->basevertex;
 445    GLuint i;
 446
 447    if (!index_bounds_valid)
 448       vbo_get_minmax_indices(ctx, prim, ib, &min_index, &max_index, nr_prims);
 449
 450    /* Mesa core state should have been validated already */
 451    assert(ctx->NewState == 0x0);
 452
 453    if (!_mesa_check_conditional_render(ctx))
 454       return; /* don't draw */
 455
 456    for (i = 1; i < nr_prims; i++)
 457       max_basevertex = MAX2(max_basevertex, prim[i].basevertex);
 458
 459    if (0)
 460    {
 461       printf("%s %d..%d\n", __func__, min_index, max_index);
 462       for (i = 0; i < nr_prims; i++)
 463          printf("prim %d: %s start %d count %d\n", i,
 464                 _mesa_enum_to_string(prim[i].mode),
 465                 prim[i].start,
 466                 prim[i].count);
 467    }
 468
 469    if (min_index) {
 470       /* We always translate away calls with min_index != 0.
 471        */
 472       t_rebase_prims( ctx, arrays, prim, nr_prims, ib,
 473                       min_index, max_index,
 474                       _tnl_draw_prims );
 475       return;
 476    }
 477    else if ((GLint)max_index + max_basevertex > max) {
 478       /* The software TNL pipeline has a fixed amount of storage for
 479        * vertices and it is necessary to split incoming drawing commands
 480        * if they exceed that limit.
 481        */
 482       struct split_limits limits;
 483       limits.max_verts = max;
 484       limits.max_vb_size = ~0;
 485       limits.max_indices = ~0;
 486
 487       /* This will split the buffers one way or another and
 488        * recursively call back into this function.
 489        */
 490       _tnl_split_prims( ctx, arrays, prim, nr_prims, ib,
 491                         0, max_index + prim->basevertex,
 492                         _tnl_draw_prims,
 493                         &limits );
 494    }
 495    else {
 496       /* May need to map a vertex buffer object for every attribute plus
 497        * one for the index buffer.
 498        */
 499       struct gl_buffer_object *bo[VERT_ATTRIB_MAX + 1];
 500       GLuint nr_bo = 0;
 501       GLuint inst;
 502
 503       for (i = 0; i < nr_prims;) {
 504          GLuint this_nr_prims;
 505
 506          /* Our SW TNL pipeline doesn't handle basevertex yet, so bind_indices
 507           * will rebase the elements to the basevertex, and we'll only
 508           * emit strings of prims with the same basevertex in one draw call.
 509           */
 510          for (this_nr_prims = 1; i + this_nr_prims < nr_prims;
 511               this_nr_prims++) {
 512             if (prim[i].basevertex != prim[i + this_nr_prims].basevertex)
 513                break;
 514          }
 515
 516          assert(prim[i].num_instances > 0);
 517
 518          /* Binding inputs may imply mapping some vertex buffer objects.
 519           * They will need to be unmapped below.
 520           */
 521          for (inst = 0; inst < prim[i].num_instances; inst++) {
 522
 523             bind_prims(ctx, &prim[i], this_nr_prims);
 524             bind_inputs(ctx, arrays, max_index + prim[i].basevertex + 1,
 525                         bo, &nr_bo);
 526             bind_indices(ctx, ib, bo, &nr_bo);
 527
 528             tnl->CurInstance = inst;
 529             TNL_CONTEXT(ctx)->Driver.RunPipeline(ctx);
 530
 531             unmap_vbos(ctx, bo, nr_bo);
 532             free_space(ctx);
 533          }
 534
 535          i += this_nr_prims;
 536       }
 537    }
 538 }
 539
 540
 541 void
 542 _tnl_init_inputs(struct tnl_inputs *inputs)
 543 {
 544    inputs->current = 0;
 545    inputs->vertex_processing_mode = VP_MODE_FF;
 546 }
 547
 548
 549 /**
 550  * Update the tnl_inputs's arrays to point to the vao->_VertexArray arrays
 551  * according to the 'enable' bitmask.
 552  * \param enable  bitfield of VERT_BIT_x flags.
 553  */
 554 static inline void
 555 update_vao_inputs(struct gl_context *ctx,
 556                   struct tnl_inputs *inputs, GLbitfield enable)
 557 {
 558    const struct gl_vertex_array_object *vao = ctx->Array._DrawVAO;
 559
 560    /* Make sure we process only arrays enabled in the VAO */
 561    assert((enable & ~_mesa_get_vao_vp_inputs(vao)) == 0);
 562
 563    /* Fill in the client arrays from the VAO */
 564    const struct gl_vertex_buffer_binding *bindings = &vao->BufferBinding[0];
 565    while (enable) {
 566       const int attr = u_bit_scan(&enable);
 567       struct tnl_vertex_array *input = &inputs->inputs[attr];
 568       const struct gl_array_attributes *attrib;
 569       attrib = _mesa_draw_array_attrib(vao, attr);
 570       input->VertexAttrib = attrib;
 571       input->BufferBinding = &bindings[attrib->BufferBindingIndex];
 572    }
 573 }
 574
 575
 576 /**
 577  * Update the tnl_inputs's arrays to point to the vbo->currval arrays
 578  * according to the 'current' bitmask.
 579  * \param current  bitfield of VERT_BIT_x flags.
 580  */
 581 static inline void
 582 update_current_inputs(struct gl_context *ctx,
 583                       struct tnl_inputs *inputs, GLbitfield current)
 584 {
 585    gl_vertex_processing_mode mode = ctx->VertexProgram._VPMode;
 586
 587    /* All previously non current array pointers need update. */
 588    GLbitfield mask = current & ~inputs->current;
 589    /* On mode change, the slots aliasing with materials need update too */
 590    if (mode != inputs->vertex_processing_mode)
 591       mask |= current & VERT_BIT_MAT_ALL;
 592
 593    while (mask) {
 594       const int attr = u_bit_scan(&mask);
 595       struct tnl_vertex_array *input = &inputs->inputs[attr];
 596       input->VertexAttrib = _vbo_current_attrib(ctx, attr);
 597       input->BufferBinding = _vbo_current_binding(ctx);
 598    }
 599
 600    inputs->current = current;
 601    inputs->vertex_processing_mode = mode;
 602 }
 603
 604
 605 /**
 606  * Update the tnl_inputs's arrays to point to the vao->_VertexArray and
 607  * vbo->currval arrays according to Array._DrawVAO and
 608  * Array._DrawVAOEnableAttribs.
 609  */
 610 void
 611 _tnl_update_inputs(struct gl_context *ctx, struct tnl_inputs *inputs)
 612 {
 613    const GLbitfield enable = ctx->Array._DrawVAOEnabledAttribs;
 614
 615    /* Update array input pointers */
 616    update_vao_inputs(ctx, inputs, enable);
 617
 618    /* The rest must be current inputs. */
 619    update_current_inputs(ctx, inputs, ~enable & VERT_BIT_ALL);
 620 }
 621
 622
 623 const struct tnl_vertex_array*
 624 _tnl_bind_inputs( struct gl_context *ctx )
 625 {
 626    TNLcontext *tnl = TNL_CONTEXT(ctx);
 627    _tnl_update_inputs(ctx, &tnl->draw_arrays);
 628    return tnl->draw_arrays.inputs;
 629 }
 630
 631
 632 /* This is the main entrypoint into the slimmed-down software tnl
 633  * module.  In a regular swtnl driver, this can be plugged straight
 634  * into the ctx->Driver.Draw() callback.
 635  */
 636 void
 637 _tnl_draw(struct gl_context *ctx,
 638           const struct _mesa_prim *prim, GLuint nr_prims,
 639           const struct _mesa_index_buffer *ib,
 640           GLboolean index_bounds_valid, GLuint min_index, GLuint max_index,
 641           struct gl_transform_feedback_object *tfb_vertcount,
 642           unsigned stream, struct gl_buffer_object *indirect)
 643 {
 644    /* Update TNLcontext::draw_arrays and return that pointer.
 645     */
 646    const struct tnl_vertex_array* arrays = _tnl_bind_inputs(ctx);
 647
 648    _tnl_draw_prims(ctx, arrays, prim, nr_prims, ib,
 649                    index_bounds_valid, min_index, max_index,
 650                    tfb_vertcount, stream, indirect);
 651 }
 652
 653
 654 void
 655 _tnl_init_driver_draw_function(struct dd_function_table *functions)
 656 {
 657    functions->Draw = _tnl_draw;
 658 }