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 "util/u_inlines.h"
  59 #include "util/u_format.h"
  60 #include "cso_cache/cso_context.h"
  61
  62
  63 static GLuint double_types[4] = {
  64    PIPE_FORMAT_R64_FLOAT,
  65    PIPE_FORMAT_R64G64_FLOAT,
  66    PIPE_FORMAT_R64G64B64_FLOAT,
  67    PIPE_FORMAT_R64G64B64A64_FLOAT
  68 };
  69
  70 static GLuint float_types[4] = {
  71    PIPE_FORMAT_R32_FLOAT,
  72    PIPE_FORMAT_R32G32_FLOAT,
  73    PIPE_FORMAT_R32G32B32_FLOAT,
  74    PIPE_FORMAT_R32G32B32A32_FLOAT
  75 };
  76
  77 static GLuint uint_types_norm[4] = {
  78    PIPE_FORMAT_R32_UNORM,
  79    PIPE_FORMAT_R32G32_UNORM,
  80    PIPE_FORMAT_R32G32B32_UNORM,
  81    PIPE_FORMAT_R32G32B32A32_UNORM
  82 };
  83
  84 static GLuint uint_types_scale[4] = {
  85    PIPE_FORMAT_R32_USCALED,
  86    PIPE_FORMAT_R32G32_USCALED,
  87    PIPE_FORMAT_R32G32B32_USCALED,
  88    PIPE_FORMAT_R32G32B32A32_USCALED
  89 };
  90
  91 static GLuint int_types_norm[4] = {
  92    PIPE_FORMAT_R32_SNORM,
  93    PIPE_FORMAT_R32G32_SNORM,
  94    PIPE_FORMAT_R32G32B32_SNORM,
  95    PIPE_FORMAT_R32G32B32A32_SNORM
  96 };
  97
  98 static GLuint int_types_scale[4] = {
  99    PIPE_FORMAT_R32_SSCALED,
 100    PIPE_FORMAT_R32G32_SSCALED,
 101    PIPE_FORMAT_R32G32B32_SSCALED,
 102    PIPE_FORMAT_R32G32B32A32_SSCALED
 103 };
 104
 105 static GLuint ushort_types_norm[4] = {
 106    PIPE_FORMAT_R16_UNORM,
 107    PIPE_FORMAT_R16G16_UNORM,
 108    PIPE_FORMAT_R16G16B16_UNORM,
 109    PIPE_FORMAT_R16G16B16A16_UNORM
 110 };
 111
 112 static GLuint ushort_types_scale[4] = {
 113    PIPE_FORMAT_R16_USCALED,
 114    PIPE_FORMAT_R16G16_USCALED,
 115    PIPE_FORMAT_R16G16B16_USCALED,
 116    PIPE_FORMAT_R16G16B16A16_USCALED
 117 };
 118
 119 static GLuint short_types_norm[4] = {
 120    PIPE_FORMAT_R16_SNORM,
 121    PIPE_FORMAT_R16G16_SNORM,
 122    PIPE_FORMAT_R16G16B16_SNORM,
 123    PIPE_FORMAT_R16G16B16A16_SNORM
 124 };
 125
 126 static GLuint short_types_scale[4] = {
 127    PIPE_FORMAT_R16_SSCALED,
 128    PIPE_FORMAT_R16G16_SSCALED,
 129    PIPE_FORMAT_R16G16B16_SSCALED,
 130    PIPE_FORMAT_R16G16B16A16_SSCALED
 131 };
 132
 133 static GLuint ubyte_types_norm[4] = {
 134    PIPE_FORMAT_R8_UNORM,
 135    PIPE_FORMAT_R8G8_UNORM,
 136    PIPE_FORMAT_R8G8B8_UNORM,
 137    PIPE_FORMAT_R8G8B8A8_UNORM
 138 };
 139
 140 static GLuint ubyte_types_scale[4] = {
 141    PIPE_FORMAT_R8_USCALED,
 142    PIPE_FORMAT_R8G8_USCALED,
 143    PIPE_FORMAT_R8G8B8_USCALED,
 144    PIPE_FORMAT_R8G8B8A8_USCALED
 145 };
 146
 147 static GLuint byte_types_norm[4] = {
 148    PIPE_FORMAT_R8_SNORM,
 149    PIPE_FORMAT_R8G8_SNORM,
 150    PIPE_FORMAT_R8G8B8_SNORM,
 151    PIPE_FORMAT_R8G8B8A8_SNORM
 152 };
 153
 154 static GLuint byte_types_scale[4] = {
 155    PIPE_FORMAT_R8_SSCALED,
 156    PIPE_FORMAT_R8G8_SSCALED,
 157    PIPE_FORMAT_R8G8B8_SSCALED,
 158    PIPE_FORMAT_R8G8B8A8_SSCALED
 159 };
 160
 161 static GLuint fixed_types[4] = {
 162    PIPE_FORMAT_R32_FIXED,
 163    PIPE_FORMAT_R32G32_FIXED,
 164    PIPE_FORMAT_R32G32B32_FIXED,
 165    PIPE_FORMAT_R32G32B32A32_FIXED
 166 };
 167
 168
 169
 170 /**
 171  * Return a PIPE_FORMAT_x for the given GL datatype and size.
 172  */
 173 GLuint
 174 st_pipe_vertex_format(GLenum type, GLuint size, GLenum format,
 175                       GLboolean normalized)
 176 {
 177    assert((type >= GL_BYTE && type <= GL_DOUBLE) ||
 178           type == GL_FIXED);
 179    assert(size >= 1);
 180    assert(size <= 4);
 181    assert(format == GL_RGBA || format == GL_BGRA);
 182
 183    if (format == GL_BGRA) {
 184       /* this is an odd-ball case */
 185       assert(type == GL_UNSIGNED_BYTE);
 186       assert(normalized);
 187       return PIPE_FORMAT_A8R8G8B8_UNORM;
 188    }
 189
 190    if (normalized) {
 191       switch (type) {
 192       case GL_DOUBLE: return double_types[size-1];
 193       case GL_FLOAT: return float_types[size-1];
 194       case GL_INT: return int_types_norm[size-1];
 195       case GL_SHORT: return short_types_norm[size-1];
 196       case GL_BYTE: return byte_types_norm[size-1];
 197       case GL_UNSIGNED_INT: return uint_types_norm[size-1];
 198       case GL_UNSIGNED_SHORT: return ushort_types_norm[size-1];
 199       case GL_UNSIGNED_BYTE: return ubyte_types_norm[size-1];
 200       case GL_FIXED: return fixed_types[size-1];
 201       default: assert(0); return 0;
 202       }
 203    }
 204    else {
 205       switch (type) {
 206       case GL_DOUBLE: return double_types[size-1];
 207       case GL_FLOAT: return float_types[size-1];
 208       case GL_INT: return int_types_scale[size-1];
 209       case GL_SHORT: return short_types_scale[size-1];
 210       case GL_BYTE: return byte_types_scale[size-1];
 211       case GL_UNSIGNED_INT: return uint_types_scale[size-1];
 212       case GL_UNSIGNED_SHORT: return ushort_types_scale[size-1];
 213       case GL_UNSIGNED_BYTE: return ubyte_types_scale[size-1];
 214       case GL_FIXED: return fixed_types[size-1];
 215       default: assert(0); return 0;
 216       }
 217    }
 218    return 0; /* silence compiler warning */
 219 }
 220
 221
 222
 223
 224
 225 /**
 226  * Examine the active arrays to determine if we have interleaved
 227  * vertex arrays all living in one VBO, or all living in user space.
 228  * \param userSpace  returns whether the arrays are in user space.
 229  */
 230 static GLboolean
 231 is_interleaved_arrays(const struct st_vertex_program *vp,
 232                       const struct st_vp_varient *vpv,
 233                       const struct gl_client_array **arrays,
 234                       GLboolean *userSpace)
 235 {
 236    GLuint attr;
 237    const struct gl_buffer_object *firstBufObj = NULL;
 238    GLint firstStride = -1;
 239    GLuint num_client_arrays = 0;
 240    const GLubyte *client_addr = NULL;
 241
 242    for (attr = 0; attr < vpv->num_inputs; attr++) {
 243       const GLuint mesaAttr = vp->index_to_input[attr];
 244       const struct gl_buffer_object *bufObj = arrays[mesaAttr]->BufferObj;
 245       const GLsizei stride = arrays[mesaAttr]->StrideB; /* in bytes */
 246
 247       if (firstStride < 0) {
 248          firstStride = stride;
 249       }
 250       else if (firstStride != stride) {
 251          return GL_FALSE;
 252       }
 253
 254       if (!bufObj || !bufObj->Name) {
 255          num_client_arrays++;
 256          /* Try to detect if the client-space arrays are
 257           * "close" to each other.
 258           */
 259          if (!client_addr) {
 260             client_addr = arrays[mesaAttr]->Ptr;
 261          }
 262          else if (abs(arrays[mesaAttr]->Ptr - client_addr) > firstStride) {
 263             /* arrays start too far apart */
 264             return GL_FALSE;
 265          }
 266       }
 267       else if (!firstBufObj) {
 268          firstBufObj = bufObj;
 269       }
 270       else if (bufObj != firstBufObj) {
 271          return GL_FALSE;
 272       }
 273    }
 274
 275    *userSpace = (num_client_arrays == vpv->num_inputs);
 276    /* printf("user space: %d (%d %d)\n", (int) *userSpace,num_client_arrays,vp->num_inputs); */
 277
 278    return GL_TRUE;
 279 }
 280
 281
 282 /**
 283  * Compute the memory range occupied by the arrays.
 284  */
 285 static void
 286 get_arrays_bounds(const struct st_vertex_program *vp,
 287                   const struct st_vp_varient *vpv,
 288                   const struct gl_client_array **arrays,
 289                   GLuint max_index,
 290                   const GLubyte **low, const GLubyte **high)
 291 {
 292    const GLubyte *low_addr = NULL;
 293    const GLubyte *high_addr = NULL;
 294    GLuint attr;
 295
 296    for (attr = 0; attr < vpv->num_inputs; attr++) {
 297       const GLuint mesaAttr = vp->index_to_input[attr];
 298       const GLint stride = arrays[mesaAttr]->StrideB;
 299       const GLubyte *start = arrays[mesaAttr]->Ptr;
 300       const unsigned sz = (arrays[mesaAttr]->Size *
 301                            _mesa_sizeof_type(arrays[mesaAttr]->Type));
 302       const GLubyte *end = start + (max_index * stride) + sz;
 303
 304       if (attr == 0) {
 305          low_addr = start;
 306          high_addr = end;
 307       }
 308       else {
 309          low_addr = MIN2(low_addr, start);
 310          high_addr = MAX2(high_addr, end);
 311       }
 312    }
 313
 314    *low = low_addr;
 315    *high = high_addr;
 316 }
 317
 318
 319 /**
 320  * Set up for drawing interleaved arrays that all live in one VBO
 321  * or all live in user space.
 322  * \param vbuffer  returns vertex buffer info
 323  * \param velements  returns vertex element info
 324  */
 325 static void
 326 setup_interleaved_attribs(GLcontext *ctx,
 327                           const struct st_vertex_program *vp,
 328                           const struct st_vp_varient *vpv,
 329                           const struct gl_client_array **arrays,
 330                           GLuint max_index,
 331                           GLboolean userSpace,
 332                           struct pipe_vertex_buffer *vbuffer,
 333                           struct pipe_vertex_element velements[])
 334 {
 335    struct pipe_context *pipe = ctx->st->pipe;
 336    GLuint attr;
 337    const GLubyte *offset0 = NULL;
 338
 339    for (attr = 0; attr < vpv->num_inputs; attr++) {
 340       const GLuint mesaAttr = vp->index_to_input[attr];
 341       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 342       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 343       GLsizei stride = arrays[mesaAttr]->StrideB;
 344
 345       /*printf("stobj %u = %p\n", attr, (void*)stobj);*/
 346
 347       if (attr == 0) {
 348          const GLubyte *low, *high;
 349
 350          get_arrays_bounds(vp, vpv, arrays, max_index, &low, &high);
 351          /*printf("buffer range: %p %p  %d\n", low, high, high-low);*/
 352
 353          offset0 = low;
 354          if (userSpace) {
 355             vbuffer->buffer =
 356                pipe_user_buffer_create(pipe->screen, (void *) low, high - low);
 357             vbuffer->buffer_offset = 0;
 358          }
 359          else {
 360             vbuffer->buffer = NULL;
 361             pipe_buffer_reference(&vbuffer->buffer, stobj->buffer);
 362             vbuffer->buffer_offset = pointer_to_offset(low);
 363          }
 364          vbuffer->stride = stride; /* in bytes */
 365          vbuffer->max_index = max_index;
 366       }
 367
 368       velements[attr].src_offset =
 369          (unsigned) (arrays[mesaAttr]->Ptr - offset0);
 370       velements[attr].instance_divisor = 0;
 371       velements[attr].vertex_buffer_index = 0;
 372       velements[attr].src_format =
 373          st_pipe_vertex_format(arrays[mesaAttr]->Type,
 374                                arrays[mesaAttr]->Size,
 375                                arrays[mesaAttr]->Format,
 376                                arrays[mesaAttr]->Normalized);
 377       assert(velements[attr].src_format);
 378    }
 379 }
 380
 381
 382 /**
 383  * Set up a separate pipe_vertex_buffer and pipe_vertex_element for each
 384  * vertex attribute.
 385  * \param vbuffer  returns vertex buffer info
 386  * \param velements  returns vertex element info
 387  */
 388 static void
 389 setup_non_interleaved_attribs(GLcontext *ctx,
 390                               const struct st_vertex_program *vp,
 391                               const struct st_vp_varient *vpv,
 392                               const struct gl_client_array **arrays,
 393                               GLuint max_index,
 394                               GLboolean *userSpace,
 395                               struct pipe_vertex_buffer vbuffer[],
 396                               struct pipe_vertex_element velements[])
 397 {
 398    struct pipe_context *pipe = ctx->st->pipe;
 399    GLuint attr;
 400
 401    for (attr = 0; attr < vpv->num_inputs; attr++) {
 402       const GLuint mesaAttr = vp->index_to_input[attr];
 403       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 404       GLsizei stride = arrays[mesaAttr]->StrideB;
 405
 406       *userSpace = GL_FALSE;
 407
 408       if (bufobj && bufobj->Name) {
 409          /* Attribute data is in a VBO.
 410           * Recall that for VBOs, the gl_client_array->Ptr field is
 411           * really an offset from the start of the VBO, not a pointer.
 412           */
 413          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 414          assert(stobj->buffer);
 415          /*printf("stobj %u = %p\n", attr, (void*) stobj);*/
 416
 417          vbuffer[attr].buffer = NULL;
 418          pipe_buffer_reference(&vbuffer[attr].buffer, stobj->buffer);
 419          vbuffer[attr].buffer_offset = pointer_to_offset(arrays[mesaAttr]->Ptr);
 420          velements[attr].src_offset = 0;
 421       }
 422       else {
 423          /* attribute data is in user-space memory, not a VBO */
 424          uint bytes;
 425          /*printf("user-space array %d stride %d\n", attr, stride);*/
 426
 427          *userSpace = GL_TRUE;
 428
 429          /* wrap user data */
 430          if (arrays[mesaAttr]->Ptr) {
 431             /* user's vertex array */
 432             if (arrays[mesaAttr]->StrideB) {
 433                bytes = arrays[mesaAttr]->StrideB * (max_index + 1);
 434             }
 435             else {
 436                bytes = arrays[mesaAttr]->Size
 437                   * _mesa_sizeof_type(arrays[mesaAttr]->Type);
 438             }
 439             vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
 440                            (void *) arrays[mesaAttr]->Ptr, bytes);
 441          }
 442          else {
 443             /* no array, use ctx->Current.Attrib[] value */
 444             bytes = sizeof(ctx->Current.Attrib[0]);
 445             vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
 446                            (void *) ctx->Current.Attrib[mesaAttr], bytes);
 447             stride = 0;
 448          }
 449
 450          vbuffer[attr].buffer_offset = 0;
 451          velements[attr].src_offset = 0;
 452       }
 453
 454       assert(velements[attr].src_offset <= 2048); /* 11-bit field */
 455
 456       /* common-case setup */
 457       vbuffer[attr].stride = stride; /* in bytes */
 458       vbuffer[attr].max_index = max_index;
 459       velements[attr].instance_divisor = 0;
 460       velements[attr].vertex_buffer_index = attr;
 461       velements[attr].src_format
 462          = st_pipe_vertex_format(arrays[mesaAttr]->Type,
 463                                  arrays[mesaAttr]->Size,
 464                                  arrays[mesaAttr]->Format,
 465                                  arrays[mesaAttr]->Normalized);
 466       assert(velements[attr].src_format);
 467    }
 468 }
 469
 470
 471
 472 /**
 473  * Prior to drawing, check that any uniforms referenced by the
 474  * current shader have been set.  If a uniform has not been set,
 475  * issue a warning.
 476  */
 477 static void
 478 check_uniforms(GLcontext *ctx)
 479 {
 480    const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
 481    if (shProg && shProg->LinkStatus) {
 482       GLuint i;
 483       for (i = 0; i < shProg->Uniforms->NumUniforms; i++) {
 484          const struct gl_uniform *u = &shProg->Uniforms->Uniforms[i];
 485          if (!u->Initialized) {
 486             _mesa_warning(ctx,
 487                           "Using shader with uninitialized uniform: %s",
 488                           u->Name);
 489          }
 490       }
 491    }
 492 }
 493
 494
 495 static unsigned translate_prim( GLcontext *ctx,
 496                                 unsigned prim )
 497 {
 498    /* Avoid quadstrips if it's easy to do so:
 499     */
 500    if (prim == GL_QUAD_STRIP &&
 501        ctx->Light.ShadeModel != GL_FLAT &&
 502        ctx->Polygon.FrontMode == GL_FILL &&
 503        ctx->Polygon.BackMode == GL_FILL)
 504       prim = GL_TRIANGLE_STRIP;
 505
 506    return prim;
 507 }
 508
 509 /**
 510  * This function gets plugged into the VBO module and is called when
 511  * we have something to render.
 512  * Basically, translate the information into the format expected by gallium.
 513  */
 514 void
 515 st_draw_vbo(GLcontext *ctx,
 516             const struct gl_client_array **arrays,
 517             const struct _mesa_prim *prims,
 518             GLuint nr_prims,
 519             const struct _mesa_index_buffer *ib,
 520             GLboolean index_bounds_valid,
 521             GLuint min_index,
 522             GLuint max_index)
 523 {
 524    struct pipe_context *pipe = ctx->st->pipe;
 525    const struct st_vertex_program *vp;
 526    const struct st_vp_varient *vpv;
 527    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 528    GLuint attr;
 529    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 530    unsigned num_vbuffers, num_velements;
 531    GLboolean userSpace = GL_FALSE;
 532    GLboolean vertDataEdgeFlags;
 533
 534    /* Mesa core state should have been validated already */
 535    assert(ctx->NewState == 0x0);
 536
 537    /* Gallium probably doesn't want this in some cases. */
 538    if (!index_bounds_valid)
 539       if (!vbo_all_varyings_in_vbos(arrays))
 540          vbo_get_minmax_index(ctx, prims, ib, &min_index, &max_index);
 541
 542    /* sanity check for pointer arithmetic below */
 543    assert(sizeof(arrays[0]->Ptr[0]) == 1);
 544
 545    vertDataEdgeFlags = arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj &&
 546                        arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj->Name;
 547    if (vertDataEdgeFlags != ctx->st->vertdata_edgeflags) {
 548       ctx->st->vertdata_edgeflags = vertDataEdgeFlags;
 549       ctx->st->dirty.st |= ST_NEW_EDGEFLAGS_DATA;
 550    }
 551
 552    st_validate_state(ctx->st);
 553
 554    /* must get these after state validation! */
 555    vp = ctx->st->vp;
 556    vpv = ctx->st->vp_varient;
 557
 558 #if 0
 559    if (MESA_VERBOSE & VERBOSE_GLSL) {
 560       check_uniforms(ctx);
 561    }
 562 #else
 563    (void) check_uniforms;
 564 #endif
 565
 566    /*
 567     * Setup the vbuffer[] and velements[] arrays.
 568     */
 569    if (is_interleaved_arrays(vp, vpv, arrays, &userSpace)) {
 570       /*printf("Draw interleaved\n");*/
 571       setup_interleaved_attribs(ctx, vp, vpv, arrays, max_index, userSpace,
 572                                 vbuffer, velements);
 573       num_vbuffers = 1;
 574       num_velements = vpv->num_inputs;
 575       if (num_velements == 0)
 576          num_vbuffers = 0;
 577    }
 578    else {
 579       /*printf("Draw non-interleaved\n");*/
 580       setup_non_interleaved_attribs(ctx, vp, vpv, arrays, max_index,
 581                                     &userSpace, vbuffer, velements);
 582       num_vbuffers = vpv->num_inputs;
 583       num_velements = vpv->num_inputs;
 584    }
 585
 586 #if 0
 587    {
 588       GLuint i;
 589       for (i = 0; i < num_vbuffers; i++) {
 590          printf("buffers[%d].stride = %u\n", i, vbuffer[i].stride);
 591          printf("buffers[%d].max_index = %u\n", i, vbuffer[i].max_index);
 592          printf("buffers[%d].buffer_offset = %u\n", i, vbuffer[i].buffer_offset);
 593          printf("buffers[%d].buffer = %p\n", i, (void*) vbuffer[i].buffer);
 594       }
 595       for (i = 0; i < num_velements; i++) {
 596          printf("vlements[%d].vbuffer_index = %u\n", i, velements[i].vertex_buffer_index);
 597          printf("vlements[%d].src_offset = %u\n", i, velements[i].src_offset);
 598          printf("vlements[%d].format = %s\n", i, util_format_name(velements[i].src_format));
 599       }
 600    }
 601 #endif
 602
 603    pipe->set_vertex_buffers(pipe, num_vbuffers, vbuffer);
 604    cso_set_vertex_elements(ctx->st->cso_context, num_velements, velements);
 605
 606    if (num_vbuffers == 0 || num_velements == 0)
 607       return;
 608
 609    /* do actual drawing */
 610    if (ib) {
 611       /* indexed primitive */
 612       struct gl_buffer_object *bufobj = ib->obj;
 613       struct pipe_buffer *indexBuf = NULL;
 614       unsigned indexSize, indexOffset, i;
 615       unsigned prim;
 616
 617       switch (ib->type) {
 618       case GL_UNSIGNED_INT:
 619          indexSize = 4;
 620          break;
 621       case GL_UNSIGNED_SHORT:
 622          indexSize = 2;
 623          break;
 624       case GL_UNSIGNED_BYTE:
 625          indexSize = 1;
 626          break;
 627       default:
 628          assert(0);
 629          return;
 630       }
 631
 632       /* get/create the index buffer object */
 633       if (bufobj && bufobj->Name) {
 634          /* elements/indexes are in a real VBO */
 635          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 636          pipe_buffer_reference(&indexBuf, stobj->buffer);
 637          indexOffset = pointer_to_offset(ib->ptr) / indexSize;
 638       }
 639       else {
 640          /* element/indicies are in user space memory */
 641          indexBuf = pipe_user_buffer_create(pipe->screen, (void *) ib->ptr,
 642                                             ib->count * indexSize);
 643          indexOffset = 0;
 644       }
 645
 646       /* draw */
 647       if (pipe->draw_range_elements && min_index != ~0 && max_index != ~0) {
 648          /* XXX: exercise temporary path to pass min/max directly
 649           * through to driver & draw module.  These interfaces still
 650           * need a bit of work...
 651           */
 652          for (i = 0; i < nr_prims; i++) {
 653             prim = translate_prim( ctx, prims[i].mode );
 654
 655             pipe->draw_range_elements(pipe, indexBuf, indexSize,
 656                                       min_index, max_index, prim,
 657                                       prims[i].start + indexOffset, prims[i].count);
 658          }
 659       }
 660       else {
 661          for (i = 0; i < nr_prims; i++) {
 662             prim = translate_prim( ctx, prims[i].mode );
 663
 664             pipe->draw_elements(pipe, indexBuf, indexSize,
 665                                 prim,
 666                                 prims[i].start + indexOffset, prims[i].count);
 667          }
 668       }
 669
 670       pipe_buffer_reference(&indexBuf, NULL);
 671    }
 672    else {
 673       /* non-indexed */
 674       GLuint i;
 675       GLuint prim;
 676
 677       for (i = 0; i < nr_prims; i++) {
 678          prim = translate_prim( ctx, prims[i].mode );
 679
 680          pipe->draw_arrays(pipe, prim, prims[i].start, prims[i].count);
 681       }
 682    }
 683
 684    /* unreference buffers (frees wrapped user-space buffer objects) */
 685    for (attr = 0; attr < num_vbuffers; attr++) {
 686       pipe_buffer_reference(&vbuffer[attr].buffer, NULL);
 687       assert(!vbuffer[attr].buffer);
 688    }
 689
 690    if (userSpace)
 691    {
 692       pipe->set_vertex_buffers(pipe, 0, NULL);
 693    }
 694 }
 695
 696
 697 void st_init_draw( struct st_context *st )
 698 {
 699    GLcontext *ctx = st->ctx;
 700
 701    vbo_set_draw_func(ctx, st_draw_vbo);
 702 }
 703
 704
 705 void st_destroy_draw( struct st_context *st )
 706 {
 707 }
 708
 709