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   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   */
  32
  33 #include "main/imports.h"
  34 #include "main/image.h"
  35 #include "main/macros.h"
  36 #include "shader/prog_uniform.h"
  37
  38 #include "vbo/vbo.h"
  39
  40 #include "st_context.h"
  41 #include "st_atom.h"
  42 #include "st_cb_bufferobjects.h"
  43 #include "st_draw.h"
  44 #include "st_program.h"
  45
  46 #include "pipe/p_context.h"
  47 #include "pipe/p_defines.h"
  48 #include "pipe/p_inlines.h"
  49
  50
  51 static GLuint double_types[4] = {
  52    PIPE_FORMAT_R64_FLOAT,
  53    PIPE_FORMAT_R64G64_FLOAT,
  54    PIPE_FORMAT_R64G64B64_FLOAT,
  55    PIPE_FORMAT_R64G64B64A64_FLOAT
  56 };
  57
  58 static GLuint float_types[4] = {
  59    PIPE_FORMAT_R32_FLOAT,
  60    PIPE_FORMAT_R32G32_FLOAT,
  61    PIPE_FORMAT_R32G32B32_FLOAT,
  62    PIPE_FORMAT_R32G32B32A32_FLOAT
  63 };
  64
  65 static GLuint uint_types_norm[4] = {
  66    PIPE_FORMAT_R32_UNORM,
  67    PIPE_FORMAT_R32G32_UNORM,
  68    PIPE_FORMAT_R32G32B32_UNORM,
  69    PIPE_FORMAT_R32G32B32A32_UNORM
  70 };
  71
  72 static GLuint uint_types_scale[4] = {
  73    PIPE_FORMAT_R32_USCALED,
  74    PIPE_FORMAT_R32G32_USCALED,
  75    PIPE_FORMAT_R32G32B32_USCALED,
  76    PIPE_FORMAT_R32G32B32A32_USCALED
  77 };
  78
  79 static GLuint int_types_norm[4] = {
  80    PIPE_FORMAT_R32_SNORM,
  81    PIPE_FORMAT_R32G32_SNORM,
  82    PIPE_FORMAT_R32G32B32_SNORM,
  83    PIPE_FORMAT_R32G32B32A32_SNORM
  84 };
  85
  86 static GLuint int_types_scale[4] = {
  87    PIPE_FORMAT_R32_SSCALED,
  88    PIPE_FORMAT_R32G32_SSCALED,
  89    PIPE_FORMAT_R32G32B32_SSCALED,
  90    PIPE_FORMAT_R32G32B32A32_SSCALED
  91 };
  92
  93 static GLuint ushort_types_norm[4] = {
  94    PIPE_FORMAT_R16_UNORM,
  95    PIPE_FORMAT_R16G16_UNORM,
  96    PIPE_FORMAT_R16G16B16_UNORM,
  97    PIPE_FORMAT_R16G16B16A16_UNORM
  98 };
  99
 100 static GLuint ushort_types_scale[4] = {
 101    PIPE_FORMAT_R16_USCALED,
 102    PIPE_FORMAT_R16G16_USCALED,
 103    PIPE_FORMAT_R16G16B16_USCALED,
 104    PIPE_FORMAT_R16G16B16A16_USCALED
 105 };
 106
 107 static GLuint short_types_norm[4] = {
 108    PIPE_FORMAT_R16_SNORM,
 109    PIPE_FORMAT_R16G16_SNORM,
 110    PIPE_FORMAT_R16G16B16_SNORM,
 111    PIPE_FORMAT_R16G16B16A16_SNORM
 112 };
 113
 114 static GLuint short_types_scale[4] = {
 115    PIPE_FORMAT_R16_SSCALED,
 116    PIPE_FORMAT_R16G16_SSCALED,
 117    PIPE_FORMAT_R16G16B16_SSCALED,
 118    PIPE_FORMAT_R16G16B16A16_SSCALED
 119 };
 120
 121 static GLuint ubyte_types_norm[4] = {
 122    PIPE_FORMAT_R8_UNORM,
 123    PIPE_FORMAT_R8G8_UNORM,
 124    PIPE_FORMAT_R8G8B8_UNORM,
 125    PIPE_FORMAT_R8G8B8A8_UNORM
 126 };
 127
 128 static GLuint ubyte_types_scale[4] = {
 129    PIPE_FORMAT_R8_USCALED,
 130    PIPE_FORMAT_R8G8_USCALED,
 131    PIPE_FORMAT_R8G8B8_USCALED,
 132    PIPE_FORMAT_R8G8B8A8_USCALED
 133 };
 134
 135 static GLuint byte_types_norm[4] = {
 136    PIPE_FORMAT_R8_SNORM,
 137    PIPE_FORMAT_R8G8_SNORM,
 138    PIPE_FORMAT_R8G8B8_SNORM,
 139    PIPE_FORMAT_R8G8B8A8_SNORM
 140 };
 141
 142 static GLuint byte_types_scale[4] = {
 143    PIPE_FORMAT_R8_SSCALED,
 144    PIPE_FORMAT_R8G8_SSCALED,
 145    PIPE_FORMAT_R8G8B8_SSCALED,
 146    PIPE_FORMAT_R8G8B8A8_SSCALED
 147 };
 148
 149 static GLuint fixed_types[4] = {
 150    PIPE_FORMAT_R32_FIXED,
 151    PIPE_FORMAT_R32G32_FIXED,
 152    PIPE_FORMAT_R32G32B32_FIXED,
 153    PIPE_FORMAT_R32G32B32A32_FIXED
 154 };
 155
 156
 157
 158 /**
 159  * Return a PIPE_FORMAT_x for the given GL datatype and size.
 160  */
 161 GLuint
 162 st_pipe_vertex_format(GLenum type, GLuint size, GLboolean normalized)
 163 {
 164    assert((type >= GL_BYTE && type <= GL_DOUBLE) ||
 165           type == GL_FIXED);
 166    assert(size >= 1);
 167    assert(size <= 4);
 168
 169    if (normalized) {
 170       switch (type) {
 171       case GL_DOUBLE: return double_types[size-1];
 172       case GL_FLOAT: return float_types[size-1];
 173       case GL_INT: return int_types_norm[size-1];
 174       case GL_SHORT: return short_types_norm[size-1];
 175       case GL_BYTE: return byte_types_norm[size-1];
 176       case GL_UNSIGNED_INT: return uint_types_norm[size-1];
 177       case GL_UNSIGNED_SHORT: return ushort_types_norm[size-1];
 178       case GL_UNSIGNED_BYTE: return ubyte_types_norm[size-1];
 179       case GL_FIXED: return fixed_types[size-1];
 180       default: assert(0); return 0;
 181       }
 182    }
 183    else {
 184       switch (type) {
 185       case GL_DOUBLE: return double_types[size-1];
 186       case GL_FLOAT: return float_types[size-1];
 187       case GL_INT: return int_types_scale[size-1];
 188       case GL_SHORT: return short_types_scale[size-1];
 189       case GL_BYTE: return byte_types_scale[size-1];
 190       case GL_UNSIGNED_INT: return uint_types_scale[size-1];
 191       case GL_UNSIGNED_SHORT: return ushort_types_scale[size-1];
 192       case GL_UNSIGNED_BYTE: return ubyte_types_scale[size-1];
 193       case GL_FIXED: return fixed_types[size-1];
 194       default: assert(0); return 0;
 195       }
 196    }
 197    return 0; /* silence compiler warning */
 198 }
 199
 200
 201 /*
 202  * If edge flags are needed, setup an bitvector of flags and call
 203  * pipe->set_edgeflags().
 204  * XXX memleak: need to free the returned pointer at some point
 205  */
 206 static void *
 207 setup_edgeflags(GLcontext *ctx, GLenum primMode, GLint start, GLint count,
 208                 const struct gl_client_array *array)
 209 {
 210    struct pipe_context *pipe = ctx->st->pipe;
 211
 212    if ((primMode == GL_TRIANGLES ||
 213         primMode == GL_QUADS ||
 214         primMode == GL_POLYGON) &&
 215        (ctx->Polygon.FrontMode != GL_FILL ||
 216         ctx->Polygon.BackMode != GL_FILL)) {
 217       /* need edge flags */
 218       GLint i;
 219       unsigned *vec;
 220       struct st_buffer_object *stobj = st_buffer_object(array->BufferObj);
 221       ubyte *map;
 222
 223       if (!stobj)
 224          return NULL;
 225
 226       vec = (unsigned *) calloc(sizeof(unsigned), (count + 31) / 32);
 227       if (!vec)
 228          return NULL;
 229
 230       map = pipe_buffer_map(pipe->screen, stobj->buffer, PIPE_BUFFER_USAGE_CPU_READ);
 231       map = ADD_POINTERS(map, array->Ptr);
 232
 233       for (i = 0; i < count; i++) {
 234          if (*((float *) map))
 235             vec[i/32] |= 1 << (i % 32);
 236
 237          map += array->StrideB;
 238       }
 239
 240       pipe_buffer_unmap(pipe->screen, stobj->buffer);
 241
 242       pipe->set_edgeflags(pipe, vec);
 243
 244       return vec;
 245    }
 246    else {
 247       /* edge flags not needed */
 248       pipe->set_edgeflags(pipe, NULL);
 249       return NULL;
 250    }
 251 }
 252
 253
 254 /**
 255  * Examine the active arrays to determine if we have interleaved
 256  * vertex arrays all living in one VBO, or all living in user space.
 257  * \param userSpace  returns whether the arrays are in user space.
 258  */
 259 static GLboolean
 260 is_interleaved_arrays(const struct st_vertex_program *vp,
 261                       const struct gl_client_array **arrays,
 262                       GLboolean *userSpace)
 263 {
 264    GLuint attr;
 265    const struct gl_buffer_object *firstBufObj = NULL;
 266    GLint firstStride = -1;
 267    GLuint num_client_arrays = 0;
 268    const GLubyte *client_addr = NULL;
 269
 270    for (attr = 0; attr < vp->num_inputs; attr++) {
 271       const GLuint mesaAttr = vp->index_to_input[attr];
 272       const struct gl_buffer_object *bufObj = arrays[mesaAttr]->BufferObj;
 273       const GLsizei stride = arrays[mesaAttr]->StrideB; /* in bytes */
 274
 275       if (firstStride < 0) {
 276          firstStride = stride;
 277       }
 278       else if (firstStride != stride) {
 279          return GL_FALSE;
 280       }
 281
 282       if (!bufObj || !bufObj->Name) {
 283          num_client_arrays++;
 284          /* Try to detect if the client-space arrays are
 285           * "close" to each other.
 286           */
 287          if (!client_addr) {
 288             client_addr = arrays[mesaAttr]->Ptr;
 289          }
 290          else if (abs(arrays[mesaAttr]->Ptr - client_addr) > firstStride) {
 291             /* arrays start too far apart */
 292             return GL_FALSE;
 293          }
 294       }
 295       else if (!firstBufObj) {
 296          firstBufObj = bufObj;
 297       }
 298       else if (bufObj != firstBufObj) {
 299          return GL_FALSE;
 300       }
 301    }
 302
 303    *userSpace = (num_client_arrays == vp->num_inputs);
 304    /* printf("user space: %d (%d %d)\n", (int) *userSpace,num_client_arrays,vp->num_inputs); */
 305
 306    return GL_TRUE;
 307 }
 308
 309
 310 /**
 311  * Compute the memory range occupied by the arrays.
 312  */
 313 static void
 314 get_arrays_bounds(const struct st_vertex_program *vp,
 315                        const struct gl_client_array **arrays,
 316                        GLuint max_index,
 317                        const GLubyte **low, const GLubyte **high)
 318 {
 319    const GLubyte *low_addr = NULL;
 320    GLuint attr;
 321    GLint stride;
 322
 323    for (attr = 0; attr < vp->num_inputs; attr++) {
 324       const GLuint mesaAttr = vp->index_to_input[attr];
 325       const GLubyte *start = arrays[mesaAttr]->Ptr;
 326       stride = arrays[mesaAttr]->StrideB;
 327       if (attr == 0) {
 328          low_addr = start;
 329       }
 330       else {
 331          low_addr = MIN2(low_addr, start);
 332       }
 333    }
 334
 335    *low = low_addr;
 336    *high = low_addr + (max_index + 1) * stride;
 337 }
 338
 339
 340 /**
 341  * Set up for drawing interleaved arrays that all live in one VBO
 342  * or all live in user space.
 343  * \param vbuffer  returns vertex buffer info
 344  * \param velements  returns vertex element info
 345  */
 346 static void
 347 setup_interleaved_attribs(GLcontext *ctx,
 348                           const struct st_vertex_program *vp,
 349                           const struct gl_client_array **arrays,
 350                           GLuint max_index,
 351                           GLboolean userSpace,
 352                           struct pipe_vertex_buffer *vbuffer,
 353                           struct pipe_vertex_element velements[])
 354 {
 355    struct pipe_context *pipe = ctx->st->pipe;
 356    GLuint attr;
 357    const GLubyte *offset0;
 358
 359    for (attr = 0; attr < vp->num_inputs; attr++) {
 360       const GLuint mesaAttr = vp->index_to_input[attr];
 361       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 362       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 363       GLsizei stride = arrays[mesaAttr]->StrideB;
 364
 365       /*printf("stobj %u = %p\n", attr, (void*)stobj);*/
 366
 367       if (attr == 0) {
 368          const GLubyte *low, *high;
 369
 370          get_arrays_bounds(vp, arrays, max_index, &low, &high);
 371          /*printf("buffer range: %p %p  %d\n", low, high, high-low);*/
 372
 373          offset0 = low;
 374          if (userSpace) {
 375             vbuffer->buffer =
 376                pipe_user_buffer_create(pipe->screen, (void *) low, high - low);
 377             vbuffer->buffer_offset = 0;
 378          }
 379          else {
 380             vbuffer->buffer = NULL;
 381             pipe_buffer_reference(pipe->screen, &vbuffer->buffer, stobj->buffer);
 382             vbuffer->buffer_offset = (unsigned) low;
 383          }
 384          vbuffer->stride = stride; /* in bytes */
 385          vbuffer->max_index = max_index;
 386       }
 387
 388       velements[attr].src_offset =
 389          (unsigned) (arrays[mesaAttr]->Ptr - offset0);
 390       velements[attr].vertex_buffer_index = 0;
 391       velements[attr].nr_components = arrays[mesaAttr]->Size;
 392       velements[attr].src_format =
 393          st_pipe_vertex_format(arrays[mesaAttr]->Type,
 394                                arrays[mesaAttr]->Size,
 395                                arrays[mesaAttr]->Normalized);
 396       assert(velements[attr].src_format);
 397    }
 398 }
 399
 400
 401 /**
 402  * Set up a separate pipe_vertex_buffer and pipe_vertex_element for each
 403  * vertex attribute.
 404  * \param vbuffer  returns vertex buffer info
 405  * \param velements  returns vertex element info
 406  */
 407 static void
 408 setup_non_interleaved_attribs(GLcontext *ctx,
 409                               const struct st_vertex_program *vp,
 410                               const struct gl_client_array **arrays,
 411                               GLuint max_index,
 412                               GLboolean *userSpace,
 413                               struct pipe_vertex_buffer vbuffer[],
 414                               struct pipe_vertex_element velements[])
 415 {
 416    struct pipe_context *pipe = ctx->st->pipe;
 417    GLuint attr;
 418
 419    for (attr = 0; attr < vp->num_inputs; attr++) {
 420       const GLuint mesaAttr = vp->index_to_input[attr];
 421       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 422       GLsizei stride = arrays[mesaAttr]->StrideB;
 423
 424       *userSpace = GL_FALSE;
 425
 426       if (bufobj && bufobj->Name) {
 427          /* Attribute data is in a VBO.
 428           * Recall that for VBOs, the gl_client_array->Ptr field is
 429           * really an offset from the start of the VBO, not a pointer.
 430           */
 431          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 432          assert(stobj->buffer);
 433          /*printf("stobj %u = %p\n", attr, (void*) stobj);*/
 434
 435          vbuffer[attr].buffer = NULL;
 436          pipe_buffer_reference(pipe->screen, &vbuffer[attr].buffer, stobj->buffer);
 437          vbuffer[attr].buffer_offset = (unsigned) arrays[mesaAttr]->Ptr;
 438          velements[attr].src_offset = 0;
 439       }
 440       else {
 441          /* attribute data is in user-space memory, not a VBO */
 442          uint bytes;
 443          /*printf("user-space array %d stride %d\n", attr, stride);*/
 444
 445          *userSpace = GL_TRUE;
 446
 447          /* wrap user data */
 448          if (arrays[mesaAttr]->Ptr) {
 449             /* user's vertex array */
 450             if (arrays[mesaAttr]->StrideB) {
 451                bytes = arrays[mesaAttr]->StrideB * (max_index + 1);
 452             }
 453             else {
 454                bytes = arrays[mesaAttr]->Size
 455                   * _mesa_sizeof_type(arrays[mesaAttr]->Type);
 456             }
 457             vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
 458                            (void *) arrays[mesaAttr]->Ptr, bytes);
 459          }
 460          else {
 461             /* no array, use ctx->Current.Attrib[] value */
 462             bytes = sizeof(ctx->Current.Attrib[0]);
 463             vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
 464                            (void *) ctx->Current.Attrib[mesaAttr], bytes);
 465             stride = 0;
 466          }
 467
 468          vbuffer[attr].buffer_offset = 0;
 469          velements[attr].src_offset = 0;
 470       }
 471
 472       assert(velements[attr].src_offset <= 2048); /* 11-bit field */
 473
 474       /* common-case setup */
 475       vbuffer[attr].stride = stride; /* in bytes */
 476       vbuffer[attr].max_index = max_index;
 477       velements[attr].vertex_buffer_index = attr;
 478       velements[attr].nr_components = arrays[mesaAttr]->Size;
 479       velements[attr].src_format
 480          = st_pipe_vertex_format(arrays[mesaAttr]->Type,
 481                                  arrays[mesaAttr]->Size,
 482                                  arrays[mesaAttr]->Normalized);
 483       assert(velements[attr].src_format);
 484    }
 485 }
 486
 487
 488
 489 /**
 490  * Prior to drawing, check that any uniforms referenced by the
 491  * current shader have been set.  If a uniform has not been set,
 492  * issue a warning.
 493  */
 494 static void
 495 check_uniforms(GLcontext *ctx)
 496 {
 497    const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
 498    if (shProg && shProg->LinkStatus) {
 499       GLuint i;
 500       for (i = 0; i < shProg->Uniforms->NumUniforms; i++) {
 501          const struct gl_uniform *u = &shProg->Uniforms->Uniforms[i];
 502          if (!u->Initialized) {
 503             _mesa_warning(ctx,
 504                           "Using shader with uninitialized uniform: %s",
 505                           u->Name);
 506          }
 507       }
 508    }
 509 }
 510
 511
 512 /**
 513  * This function gets plugged into the VBO module and is called when
 514  * we have something to render.
 515  * Basically, translate the information into the format expected by gallium.
 516  */
 517 void
 518 st_draw_vbo(GLcontext *ctx,
 519             const struct gl_client_array **arrays,
 520             const struct _mesa_prim *prims,
 521             GLuint nr_prims,
 522             const struct _mesa_index_buffer *ib,
 523             GLuint min_index,
 524             GLuint max_index)
 525 {
 526    struct pipe_context *pipe = ctx->st->pipe;
 527    const struct st_vertex_program *vp;
 528    const struct pipe_shader_state *vs;
 529    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 530    GLuint attr;
 531    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 532    unsigned num_vbuffers, num_velements;
 533    GLboolean userSpace;
 534
 535    /* sanity check for pointer arithmetic below */
 536    assert(sizeof(arrays[0]->Ptr[0]) == 1);
 537
 538    st_validate_state(ctx->st);
 539
 540    /* must get these after state validation! */
 541    vp = ctx->st->vp;
 542    vs = &ctx->st->vp->state;
 543
 544 #if 0
 545    if (MESA_VERBOSE & VERBOSE_GLSL) {
 546       check_uniforms(ctx);
 547    }
 548 #endif
 549
 550    /*
 551     * Setup the vbuffer[] and velements[] arrays.
 552     */
 553    if (is_interleaved_arrays(vp, arrays, &userSpace)) {
 554       /*printf("Draw interleaved\n");*/
 555       setup_interleaved_attribs(ctx, vp, arrays, max_index, userSpace,
 556                                 vbuffer, velements);
 557       num_vbuffers = 1;
 558       num_velements = vp->num_inputs;
 559       if (num_velements == 0)
 560          num_vbuffers = 0;
 561    }
 562    else {
 563       /*printf("Draw non-interleaved\n");*/
 564       setup_non_interleaved_attribs(ctx, vp, arrays, max_index,
 565                                     &userSpace, vbuffer, velements);
 566       num_vbuffers = vp->num_inputs;
 567       num_velements = vp->num_inputs;
 568    }
 569
 570 #if 0
 571    {
 572       GLuint i;
 573       for (i = 0; i < num_vbuffers; i++) {
 574          printf("buffers[%d].stride = %u\n", i, vbuffer[i].stride);
 575          printf("buffers[%d].max_index = %u\n", i, vbuffer[i].max_index);
 576          printf("buffers[%d].buffer_offset = %u\n", i, vbuffer[i].buffer_offset);
 577          printf("buffers[%d].buffer = %p\n", i, (void*) vbuffer[i].buffer);
 578       }
 579       for (i = 0; i < num_velements; i++) {
 580          printf("vlements[%d].vbuffer_index = %u\n", i, velements[i].vertex_buffer_index);
 581          printf("vlements[%d].src_offset = %u\n", i, velements[i].src_offset);
 582          printf("vlements[%d].nr_comps = %u\n", i, velements[i].nr_components);
 583          printf("vlements[%d].format = %s\n", i, pf_name(velements[i].src_format));
 584       }
 585    }
 586 #endif
 587
 588    pipe->set_vertex_buffers(pipe, num_vbuffers, vbuffer);
 589    pipe->set_vertex_elements(pipe, num_velements, velements);
 590
 591    if (num_vbuffers == 0 || num_velements == 0)
 592       return;
 593
 594    /* do actual drawing */
 595    if (ib) {
 596       /* indexed primitive */
 597       struct gl_buffer_object *bufobj = ib->obj;
 598       struct pipe_buffer *indexBuf = NULL;
 599       unsigned indexSize, indexOffset, i;
 600
 601       switch (ib->type) {
 602       case GL_UNSIGNED_INT:
 603          indexSize = 4;
 604          break;
 605       case GL_UNSIGNED_SHORT:
 606          indexSize = 2;
 607          break;
 608       case GL_UNSIGNED_BYTE:
 609          indexSize = 1;
 610          break;
 611       default:
 612          assert(0);
 613          return;
 614       }
 615
 616       /* get/create the index buffer object */
 617       if (bufobj && bufobj->Name) {
 618          /* elements/indexes are in a real VBO */
 619          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 620          pipe_buffer_reference(pipe->screen, &indexBuf, stobj->buffer);
 621          indexOffset = (unsigned) ib->ptr / indexSize;
 622       }
 623       else {
 624          /* element/indicies are in user space memory */
 625          indexBuf = pipe_user_buffer_create(pipe->screen, (void *) ib->ptr,
 626                                             ib->count * indexSize);
 627          indexOffset = 0;
 628       }
 629
 630       /* draw */
 631       if (nr_prims == 1 && pipe->draw_range_elements != NULL) {
 632          i = 0;
 633
 634          /* XXX: exercise temporary path to pass min/max directly
 635           * through to driver & draw module.  These interfaces still
 636           * need a bit of work...
 637           */
 638          setup_edgeflags(ctx, prims[i].mode,
 639                          prims[i].start + indexOffset, prims[i].count,
 640                          arrays[VERT_ATTRIB_EDGEFLAG]);
 641
 642          pipe->draw_range_elements(pipe, indexBuf, indexSize,
 643                                    min_index,
 644                                    max_index,
 645                                    prims[i].mode,
 646                                    prims[i].start + indexOffset, prims[i].count);
 647       }
 648       else {
 649          for (i = 0; i < nr_prims; i++) {
 650             setup_edgeflags(ctx, prims[i].mode,
 651                             prims[i].start + indexOffset, prims[i].count,
 652                             arrays[VERT_ATTRIB_EDGEFLAG]);
 653
 654             pipe->draw_elements(pipe, indexBuf, indexSize,
 655                                 prims[i].mode,
 656                                 prims[i].start + indexOffset, prims[i].count);
 657          }
 658       }
 659
 660       pipe_buffer_reference(pipe->screen, &indexBuf, NULL);
 661    }
 662    else {
 663       /* non-indexed */
 664       GLuint i;
 665       for (i = 0; i < nr_prims; i++) {
 666          setup_edgeflags(ctx, prims[i].mode,
 667                          prims[i].start, prims[i].count,
 668                          arrays[VERT_ATTRIB_EDGEFLAG]);
 669
 670          pipe->draw_arrays(pipe, prims[i].mode, prims[i].start, prims[i].count);
 671       }
 672    }
 673
 674    /* unreference buffers (frees wrapped user-space buffer objects) */
 675    for (attr = 0; attr < num_vbuffers; attr++) {
 676       pipe_buffer_reference(pipe->screen, &vbuffer[attr].buffer, NULL);
 677       assert(!vbuffer[attr].buffer);
 678    }
 679
 680    if (userSpace)
 681    {
 682       pipe->set_vertex_buffers(pipe, 0, NULL);
 683    }
 684 }
 685
 686
 687 void st_init_draw( struct st_context *st )
 688 {
 689    GLcontext *ctx = st->ctx;
 690
 691    vbo_set_draw_func(ctx, st_draw_vbo);
 692 }
 693
 694
 695 void st_destroy_draw( struct st_context *st )
 696 {
 697 }
 698
 699