src/mesa/state_tracker/st_draw.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * 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
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /*
  29  * This file implements the st_draw_vbo() function which is called from
  30  * Mesa's VBO module.  All point/line/triangle rendering is done through
  31  * this function whether the user called glBegin/End, glDrawArrays,
  32  * glDrawElements, glEvalMesh, or glCalList, etc.
  33  *
  34  * We basically convert the VBO's vertex attribute/array information into
  35  * Gallium vertex state, bind the vertex buffer objects and call
  36  * pipe->draw_elements(), pipe->draw_range_elements() or pipe->draw_arrays().
  37  *
  38  * Authors:
  39  *   Keith Whitwell <keith@tungstengraphics.com>
  40  */
  41
  42
  43 #include "main/imports.h"
  44 #include "main/image.h"
  45 #include "main/macros.h"
  46 #include "shader/prog_uniform.h"
  47
  48 #include "vbo/vbo.h"
  49
  50 #include "st_context.h"
  51 #include "st_atom.h"
  52 #include "st_cb_bufferobjects.h"
  53 #include "st_draw.h"
  54 #include "st_program.h"
  55
  56 #include "pipe/p_context.h"
  57 #include "pipe/p_defines.h"
  58 #include "pipe/p_inlines.h"
  59
  60
  61 static GLuint double_types[4] = {
  62    PIPE_FORMAT_R64_FLOAT,
  63    PIPE_FORMAT_R64G64_FLOAT,
  64    PIPE_FORMAT_R64G64B64_FLOAT,
  65    PIPE_FORMAT_R64G64B64A64_FLOAT
  66 };
  67
  68 static GLuint float_types[4] = {
  69    PIPE_FORMAT_R32_FLOAT,
  70    PIPE_FORMAT_R32G32_FLOAT,
  71    PIPE_FORMAT_R32G32B32_FLOAT,
  72    PIPE_FORMAT_R32G32B32A32_FLOAT
  73 };
  74
  75 static GLuint uint_types_norm[4] = {
  76    PIPE_FORMAT_R32_UNORM,
  77    PIPE_FORMAT_R32G32_UNORM,
  78    PIPE_FORMAT_R32G32B32_UNORM,
  79    PIPE_FORMAT_R32G32B32A32_UNORM
  80 };
  81
  82 static GLuint uint_types_scale[4] = {
  83    PIPE_FORMAT_R32_USCALED,
  84    PIPE_FORMAT_R32G32_USCALED,
  85    PIPE_FORMAT_R32G32B32_USCALED,
  86    PIPE_FORMAT_R32G32B32A32_USCALED
  87 };
  88
  89 static GLuint int_types_norm[4] = {
  90    PIPE_FORMAT_R32_SNORM,
  91    PIPE_FORMAT_R32G32_SNORM,
  92    PIPE_FORMAT_R32G32B32_SNORM,
  93    PIPE_FORMAT_R32G32B32A32_SNORM
  94 };
  95
  96 static GLuint int_types_scale[4] = {
  97    PIPE_FORMAT_R32_SSCALED,
  98    PIPE_FORMAT_R32G32_SSCALED,
  99    PIPE_FORMAT_R32G32B32_SSCALED,
 100    PIPE_FORMAT_R32G32B32A32_SSCALED
 101 };
 102
 103 static GLuint ushort_types_norm[4] = {
 104    PIPE_FORMAT_R16_UNORM,
 105    PIPE_FORMAT_R16G16_UNORM,
 106    PIPE_FORMAT_R16G16B16_UNORM,
 107    PIPE_FORMAT_R16G16B16A16_UNORM
 108 };
 109
 110 static GLuint ushort_types_scale[4] = {
 111    PIPE_FORMAT_R16_USCALED,
 112    PIPE_FORMAT_R16G16_USCALED,
 113    PIPE_FORMAT_R16G16B16_USCALED,
 114    PIPE_FORMAT_R16G16B16A16_USCALED
 115 };
 116
 117 static GLuint short_types_norm[4] = {
 118    PIPE_FORMAT_R16_SNORM,
 119    PIPE_FORMAT_R16G16_SNORM,
 120    PIPE_FORMAT_R16G16B16_SNORM,
 121    PIPE_FORMAT_R16G16B16A16_SNORM
 122 };
 123
 124 static GLuint short_types_scale[4] = {
 125    PIPE_FORMAT_R16_SSCALED,
 126    PIPE_FORMAT_R16G16_SSCALED,
 127    PIPE_FORMAT_R16G16B16_SSCALED,
 128    PIPE_FORMAT_R16G16B16A16_SSCALED
 129 };
 130
 131 static GLuint ubyte_types_norm[4] = {
 132    PIPE_FORMAT_R8_UNORM,
 133    PIPE_FORMAT_R8G8_UNORM,
 134    PIPE_FORMAT_R8G8B8_UNORM,
 135    PIPE_FORMAT_R8G8B8A8_UNORM
 136 };
 137
 138 static GLuint ubyte_types_scale[4] = {
 139    PIPE_FORMAT_R8_USCALED,
 140    PIPE_FORMAT_R8G8_USCALED,
 141    PIPE_FORMAT_R8G8B8_USCALED,
 142    PIPE_FORMAT_R8G8B8A8_USCALED
 143 };
 144
 145 static GLuint byte_types_norm[4] = {
 146    PIPE_FORMAT_R8_SNORM,
 147    PIPE_FORMAT_R8G8_SNORM,
 148    PIPE_FORMAT_R8G8B8_SNORM,
 149    PIPE_FORMAT_R8G8B8A8_SNORM
 150 };
 151
 152 static GLuint byte_types_scale[4] = {
 153    PIPE_FORMAT_R8_SSCALED,
 154    PIPE_FORMAT_R8G8_SSCALED,
 155    PIPE_FORMAT_R8G8B8_SSCALED,
 156    PIPE_FORMAT_R8G8B8A8_SSCALED
 157 };
 158
 159 static GLuint fixed_types[4] = {
 160    PIPE_FORMAT_R32_FIXED,
 161    PIPE_FORMAT_R32G32_FIXED,
 162    PIPE_FORMAT_R32G32B32_FIXED,
 163    PIPE_FORMAT_R32G32B32A32_FIXED
 164 };
 165
 166
 167
 168 /**
 169  * Return a PIPE_FORMAT_x for the given GL datatype and size.
 170  */
 171 GLuint
 172 st_pipe_vertex_format(GLenum type, GLuint size, GLenum format,
 173                       GLboolean normalized)
 174 {
 175    assert((type >= GL_BYTE && type <= GL_DOUBLE) ||
 176           type == GL_FIXED);
 177    assert(size >= 1);
 178    assert(size <= 4);
 179    assert(format == GL_RGBA || format == GL_BGRA);
 180
 181    if (format == GL_BGRA) {
 182       /* this is an odd-ball case */
 183       assert(type == GL_UNSIGNED_BYTE);
 184       assert(normalized);
 185       return PIPE_FORMAT_B8G8R8A8_UNORM;
 186    }
 187
 188    if (normalized) {
 189       switch (type) {
 190       case GL_DOUBLE: return double_types[size-1];
 191       case GL_FLOAT: return float_types[size-1];
 192       case GL_INT: return int_types_norm[size-1];
 193       case GL_SHORT: return short_types_norm[size-1];
 194       case GL_BYTE: return byte_types_norm[size-1];
 195       case GL_UNSIGNED_INT: return uint_types_norm[size-1];
 196       case GL_UNSIGNED_SHORT: return ushort_types_norm[size-1];
 197       case GL_UNSIGNED_BYTE: return ubyte_types_norm[size-1];
 198       case GL_FIXED: return fixed_types[size-1];
 199       default: assert(0); return 0;
 200       }
 201    }
 202    else {
 203       switch (type) {
 204       case GL_DOUBLE: return double_types[size-1];
 205       case GL_FLOAT: return float_types[size-1];
 206       case GL_INT: return int_types_scale[size-1];
 207       case GL_SHORT: return short_types_scale[size-1];
 208       case GL_BYTE: return byte_types_scale[size-1];
 209       case GL_UNSIGNED_INT: return uint_types_scale[size-1];
 210       case GL_UNSIGNED_SHORT: return ushort_types_scale[size-1];
 211       case GL_UNSIGNED_BYTE: return ubyte_types_scale[size-1];
 212       case GL_FIXED: return fixed_types[size-1];
 213       default: assert(0); return 0;
 214       }
 215    }
 216    return 0; /* silence compiler warning */
 217 }
 218
 219
 220
 221
 222
 223 /**
 224  * Examine the active arrays to determine if we have interleaved
 225  * vertex arrays all living in one VBO, or all living in user space.
 226  * \param userSpace  returns whether the arrays are in user space.
 227  */
 228 static GLboolean
 229 is_interleaved_arrays(const struct st_vertex_program *vp,
 230                       const struct st_vp_varient *vpv,
 231                       const struct gl_client_array **arrays,
 232                       GLboolean *userSpace)
 233 {
 234    GLuint attr;
 235    const struct gl_buffer_object *firstBufObj = NULL;
 236    GLint firstStride = -1;
 237    GLuint num_client_arrays = 0;
 238    const GLubyte *client_addr = NULL;
 239
 240    for (attr = 0; attr < vpv->num_inputs; attr++) {
 241       const GLuint mesaAttr = vp->index_to_input[attr];
 242       const struct gl_buffer_object *bufObj = arrays[mesaAttr]->BufferObj;
 243       const GLsizei stride = arrays[mesaAttr]->StrideB; /* in bytes */
 244
 245       if (firstStride < 0) {
 246          firstStride = stride;
 247       }
 248       else if (firstStride != stride) {
 249          return GL_FALSE;
 250       }
 251
 252       if (!bufObj || !bufObj->Name) {
 253          num_client_arrays++;
 254          /* Try to detect if the client-space arrays are
 255           * "close" to each other.
 256           */
 257          if (!client_addr) {
 258             client_addr = arrays[mesaAttr]->Ptr;
 259          }
 260          else if (abs(arrays[mesaAttr]->Ptr - client_addr) > firstStride) {
 261             /* arrays start too far apart */
 262             return GL_FALSE;
 263          }
 264       }
 265       else if (!firstBufObj) {
 266          firstBufObj = bufObj;
 267       }
 268       else if (bufObj != firstBufObj) {
 269          return GL_FALSE;
 270       }
 271    }
 272
 273    *userSpace = (num_client_arrays == vpv->num_inputs);
 274    /* printf("user space: %d (%d %d)\n", (int) *userSpace,num_client_arrays,vp->num_inputs); */
 275
 276    return GL_TRUE;
 277 }
 278
 279
 280 /**
 281  * Compute the memory range occupied by the arrays.
 282  */
 283 static void
 284 get_arrays_bounds(const struct st_vertex_program *vp,
 285                   const struct st_vp_varient *vpv,
 286                   const struct gl_client_array **arrays,
 287                   GLuint max_index,
 288                   const GLubyte **low, const GLubyte **high)
 289 {
 290    const GLubyte *low_addr = NULL;
 291    const GLubyte *high_addr = NULL;
 292    GLuint attr;
 293
 294    for (attr = 0; attr < vpv->num_inputs; attr++) {
 295       const GLuint mesaAttr = vp->index_to_input[attr];
 296       const GLint stride = arrays[mesaAttr]->StrideB;
 297       const GLubyte *start = arrays[mesaAttr]->Ptr;
 298       const unsigned sz = (arrays[mesaAttr]->Size *
 299                            _mesa_sizeof_type(arrays[mesaAttr]->Type));
 300       const GLubyte *end = start + (max_index * stride) + sz;
 301
 302       if (attr == 0) {
 303          low_addr = start;
 304          high_addr = end;
 305       }
 306       else {
 307          low_addr = MIN2(low_addr, start);
 308          high_addr = MAX2(high_addr, end);
 309       }
 310    }
 311
 312    *low = low_addr;
 313    *high = high_addr;
 314 }
 315
 316
 317 /**
 318  * Set up for drawing interleaved arrays that all live in one VBO
 319  * or all live in user space.
 320  * \param vbuffer  returns vertex buffer info
 321  * \param velements  returns vertex element info
 322  */
 323 static void
 324 setup_interleaved_attribs(GLcontext *ctx,
 325                           const struct st_vertex_program *vp,
 326                           const struct st_vp_varient *vpv,
 327                           const struct gl_client_array **arrays,
 328                           GLuint max_index,
 329                           GLboolean userSpace,
 330                           struct pipe_vertex_buffer *vbuffer,
 331                           struct pipe_vertex_element velements[])
 332 {
 333    struct pipe_context *pipe = ctx->st->pipe;
 334    GLuint attr;
 335    const GLubyte *offset0;
 336
 337    for (attr = 0; attr < vpv->num_inputs; attr++) {
 338       const GLuint mesaAttr = vp->index_to_input[attr];
 339       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 340       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 341       GLsizei stride = arrays[mesaAttr]->StrideB;
 342
 343       /*printf("stobj %u = %p\n", attr, (void*)stobj);*/
 344
 345       if (attr == 0) {
 346          const GLubyte *low, *high;
 347
 348          get_arrays_bounds(vp, vpv, arrays, max_index, &low, &high);
 349          /*printf("buffer range: %p %p  %d\n", low, high, high-low);*/
 350
 351          offset0 = low;
 352          if (userSpace) {
 353             vbuffer->buffer =
 354                pipe_user_buffer_create(pipe->screen, (void *) low, high - low);
 355             vbuffer->buffer_offset = 0;
 356          }
 357          else {
 358             vbuffer->buffer = NULL;
 359             pipe_buffer_reference(&vbuffer->buffer, stobj->buffer);
 360             vbuffer->buffer_offset = pointer_to_offset(low);
 361          }
 362          vbuffer->stride = stride; /* in bytes */
 363          vbuffer->max_index = max_index;
 364       }
 365
 366       velements[attr].src_offset =
 367          (unsigned) (arrays[mesaAttr]->Ptr - offset0);
 368       velements[attr].vertex_buffer_index = 0;
 369       velements[attr].nr_components = arrays[mesaAttr]->Size;
 370       velements[attr].src_format =
 371          st_pipe_vertex_format(arrays[mesaAttr]->Type,
 372                                arrays[mesaAttr]->Size,
 373                                arrays[mesaAttr]->Format,
 374                                arrays[mesaAttr]->Normalized);
 375       assert(velements[attr].src_format);
 376    }
 377 }
 378
 379
 380 /**
 381  * Set up a separate pipe_vertex_buffer and pipe_vertex_element for each
 382  * vertex attribute.
 383  * \param vbuffer  returns vertex buffer info
 384  * \param velements  returns vertex element info
 385  */
 386 static void
 387 setup_non_interleaved_attribs(GLcontext *ctx,
 388                               const struct st_vertex_program *vp,
 389                               const struct st_vp_varient *vpv,
 390                               const struct gl_client_array **arrays,
 391                               GLuint max_index,
 392                               GLboolean *userSpace,
 393                               struct pipe_vertex_buffer vbuffer[],
 394                               struct pipe_vertex_element velements[])
 395 {
 396    struct pipe_context *pipe = ctx->st->pipe;
 397    GLuint attr;
 398
 399    for (attr = 0; attr < vpv->num_inputs; attr++) {
 400       const GLuint mesaAttr = vp->index_to_input[attr];
 401       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 402       GLsizei stride = arrays[mesaAttr]->StrideB;
 403
 404       *userSpace = GL_FALSE;
 405
 406       if (bufobj && bufobj->Name) {
 407          /* Attribute data is in a VBO.
 408           * Recall that for VBOs, the gl_client_array->Ptr field is
 409           * really an offset from the start of the VBO, not a pointer.
 410           */
 411          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 412          assert(stobj->buffer);
 413          /*printf("stobj %u = %p\n", attr, (void*) stobj);*/
 414
 415          vbuffer[attr].buffer = NULL;
 416          pipe_buffer_reference(&vbuffer[attr].buffer, stobj->buffer);
 417          vbuffer[attr].buffer_offset = pointer_to_offset(arrays[mesaAttr]->Ptr);
 418          velements[attr].src_offset = 0;
 419       }
 420       else {
 421          /* attribute data is in user-space memory, not a VBO */
 422          uint bytes;
 423          /*printf("user-space array %d stride %d\n", attr, stride);*/
 424
 425          *userSpace = GL_TRUE;
 426
 427          /* wrap user data */
 428          if (arrays[mesaAttr]->Ptr) {
 429             /* user's vertex array */
 430             if (arrays[mesaAttr]->StrideB) {
 431                bytes = arrays[mesaAttr]->StrideB * (max_index + 1);
 432             }
 433             else {
 434                bytes = arrays[mesaAttr]->Size
 435                   * _mesa_sizeof_type(arrays[mesaAttr]->Type);
 436             }
 437             vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
 438                            (void *) arrays[mesaAttr]->Ptr, bytes);
 439          }
 440          else {
 441             /* no array, use ctx->Current.Attrib[] value */
 442             bytes = sizeof(ctx->Current.Attrib[0]);
 443             vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
 444                            (void *) ctx->Current.Attrib[mesaAttr], bytes);
 445             stride = 0;
 446          }
 447
 448          vbuffer[attr].buffer_offset = 0;
 449          velements[attr].src_offset = 0;
 450       }
 451
 452       assert(velements[attr].src_offset <= 2048); /* 11-bit field */
 453
 454       /* common-case setup */
 455       vbuffer[attr].stride = stride; /* in bytes */
 456       vbuffer[attr].max_index = max_index;
 457       velements[attr].vertex_buffer_index = attr;
 458       velements[attr].nr_components = arrays[mesaAttr]->Size;
 459       velements[attr].src_format
 460          = st_pipe_vertex_format(arrays[mesaAttr]->Type,
 461                                  arrays[mesaAttr]->Size,
 462                                  arrays[mesaAttr]->Format,
 463                                  arrays[mesaAttr]->Normalized);
 464       assert(velements[attr].src_format);
 465    }
 466 }
 467
 468
 469
 470 /**
 471  * Prior to drawing, check that any uniforms referenced by the
 472  * current shader have been set.  If a uniform has not been set,
 473  * issue a warning.
 474  */
 475 static void
 476 check_uniforms(GLcontext *ctx)
 477 {
 478    const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
 479    if (shProg && shProg->LinkStatus) {
 480       GLuint i;
 481       for (i = 0; i < shProg->Uniforms->NumUniforms; i++) {
 482          const struct gl_uniform *u = &shProg->Uniforms->Uniforms[i];
 483          if (!u->Initialized) {
 484             _mesa_warning(ctx,
 485                           "Using shader with uninitialized uniform: %s",
 486                           u->Name);
 487          }
 488       }
 489    }
 490 }
 491
 492
 493 /**
 494  * This function gets plugged into the VBO module and is called when
 495  * we have something to render.
 496  * Basically, translate the information into the format expected by gallium.
 497  */
 498 void
 499 st_draw_vbo(GLcontext *ctx,
 500             const struct gl_client_array **arrays,
 501             const struct _mesa_prim *prims,
 502             GLuint nr_prims,
 503             const struct _mesa_index_buffer *ib,
 504             GLboolean index_bounds_valid,
 505             GLuint min_index,
 506             GLuint max_index)
 507 {
 508    struct pipe_context *pipe = ctx->st->pipe;
 509    const struct st_vertex_program *vp;
 510    const struct st_vp_varient *vpv;
 511    const struct pipe_shader_state *vs;
 512    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 513    GLuint attr;
 514    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 515    unsigned num_vbuffers, num_velements;
 516    GLboolean userSpace;
 517    GLboolean vertDataEdgeFlags;
 518
 519    /* Gallium probably doesn't want this in some cases. */
 520    if (!index_bounds_valid)
 521       vbo_get_minmax_index(ctx, prims, ib, &min_index, &max_index);
 522
 523    /* sanity check for pointer arithmetic below */
 524    assert(sizeof(arrays[0]->Ptr[0]) == 1);
 525
 526    vertDataEdgeFlags = arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj &&
 527                        arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj->Name;
 528    if (vertDataEdgeFlags != ctx->st->vertdata_edgeflags) {
 529       ctx->st->vertdata_edgeflags = vertDataEdgeFlags;
 530       ctx->st->dirty.st |= ST_NEW_EDGEFLAGS_DATA;
 531    }
 532
 533    st_validate_state(ctx->st);
 534
 535    /* must get these after state validation! */
 536    vp = ctx->st->vp;
 537    vpv = ctx->st->vp_varient;
 538    vs = &vpv->state;
 539
 540 #if 0
 541    if (MESA_VERBOSE & VERBOSE_GLSL) {
 542       check_uniforms(ctx);
 543    }
 544 #else
 545    (void) check_uniforms;
 546 #endif
 547
 548    /*
 549     * Setup the vbuffer[] and velements[] arrays.
 550     */
 551    if (is_interleaved_arrays(vp, vpv, arrays, &userSpace)) {
 552       /*printf("Draw interleaved\n");*/
 553       setup_interleaved_attribs(ctx, vp, vpv, arrays, max_index, userSpace,
 554                                 vbuffer, velements);
 555       num_vbuffers = 1;
 556       num_velements = vpv->num_inputs;
 557       if (num_velements == 0)
 558          num_vbuffers = 0;
 559    }
 560    else {
 561       /*printf("Draw non-interleaved\n");*/
 562       setup_non_interleaved_attribs(ctx, vp, vpv, arrays, max_index,
 563                                     &userSpace, vbuffer, velements);
 564       num_vbuffers = vpv->num_inputs;
 565       num_velements = vpv->num_inputs;
 566    }
 567
 568 #if 0
 569    {
 570       GLuint i;
 571       for (i = 0; i < num_vbuffers; i++) {
 572          printf("buffers[%d].stride = %u\n", i, vbuffer[i].stride);
 573          printf("buffers[%d].max_index = %u\n", i, vbuffer[i].max_index);
 574          printf("buffers[%d].buffer_offset = %u\n", i, vbuffer[i].buffer_offset);
 575          printf("buffers[%d].buffer = %p\n", i, (void*) vbuffer[i].buffer);
 576       }
 577       for (i = 0; i < num_velements; i++) {
 578          printf("vlements[%d].vbuffer_index = %u\n", i, velements[i].vertex_buffer_index);
 579          printf("vlements[%d].src_offset = %u\n", i, velements[i].src_offset);
 580          printf("vlements[%d].nr_comps = %u\n", i, velements[i].nr_components);
 581          printf("vlements[%d].format = %s\n", i, pf_name(velements[i].src_format));
 582       }
 583    }
 584 #endif
 585
 586    pipe->set_vertex_buffers(pipe, num_vbuffers, vbuffer);
 587    pipe->set_vertex_elements(pipe, num_velements, velements);
 588
 589    if (num_vbuffers == 0 || num_velements == 0)
 590       return;
 591
 592    /* do actual drawing */
 593    if (ib) {
 594       /* indexed primitive */
 595       struct gl_buffer_object *bufobj = ib->obj;
 596       struct pipe_buffer *indexBuf = NULL;
 597       unsigned indexSize, indexOffset, i;
 598
 599       switch (ib->type) {
 600       case GL_UNSIGNED_INT:
 601          indexSize = 4;
 602          break;
 603       case GL_UNSIGNED_SHORT:
 604          indexSize = 2;
 605          break;
 606       case GL_UNSIGNED_BYTE:
 607          indexSize = 1;
 608          break;
 609       default:
 610          assert(0);
 611          return;
 612       }
 613
 614       /* get/create the index buffer object */
 615       if (bufobj && bufobj->Name) {
 616          /* elements/indexes are in a real VBO */
 617          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 618          pipe_buffer_reference(&indexBuf, stobj->buffer);
 619          indexOffset = pointer_to_offset(ib->ptr) / indexSize;
 620       }
 621       else {
 622          /* element/indicies are in user space memory */
 623          indexBuf = pipe_user_buffer_create(pipe->screen, (void *) ib->ptr,
 624                                             ib->count * indexSize);
 625          indexOffset = 0;
 626       }
 627
 628       /* draw */
 629       if (nr_prims == 1 && pipe->draw_range_elements != NULL) {
 630          i = 0;
 631
 632          /* XXX: exercise temporary path to pass min/max directly
 633           * through to driver & draw module.  These interfaces still
 634           * need a bit of work...
 635           */
 636          pipe->draw_range_elements(pipe, indexBuf, indexSize,
 637                                    min_index,
 638                                    max_index,
 639                                    prims[i].mode,
 640                                    prims[i].start + indexOffset, prims[i].count);
 641       }
 642       else {
 643          for (i = 0; i < nr_prims; i++) {
 644             pipe->draw_elements(pipe, indexBuf, indexSize,
 645                                 prims[i].mode,
 646                                 prims[i].start + indexOffset, prims[i].count);
 647          }
 648       }
 649
 650       pipe_buffer_reference(&indexBuf, NULL);
 651    }
 652    else {
 653       /* non-indexed */
 654       GLuint i;
 655       for (i = 0; i < nr_prims; i++) {
 656          pipe->draw_arrays(pipe, prims[i].mode, prims[i].start, prims[i].count);
 657       }
 658    }
 659
 660    /* unreference buffers (frees wrapped user-space buffer objects) */
 661    for (attr = 0; attr < num_vbuffers; attr++) {
 662       pipe_buffer_reference(&vbuffer[attr].buffer, NULL);
 663       assert(!vbuffer[attr].buffer);
 664    }
 665
 666    if (userSpace)
 667    {
 668       pipe->set_vertex_buffers(pipe, 0, NULL);
 669    }
 670 }
 671
 672
 673 void st_init_draw( struct st_context *st )
 674 {
 675    GLcontext *ctx = st->ctx;
 676
 677    vbo_set_draw_func(ctx, st_draw_vbo);
 678 }
 679
 680
 681 void st_destroy_draw( struct st_context *st )
 682 {
 683 }
 684
 685