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, GLenum format,
 163                       GLboolean normalized)
 164 {
 165    assert((type >= GL_BYTE && type <= GL_DOUBLE) ||
 166           type == GL_FIXED);
 167    assert(size >= 1);
 168    assert(size <= 4);
 169    assert(format == GL_RGBA || format == GL_BGRA);
 170
 171    if (format == GL_BGRA) {
 172       /* this is an odd-ball case */
 173       assert(type == GL_UNSIGNED_BYTE);
 174       assert(normalized);
 175       return PIPE_FORMAT_B8G8R8A8_UNORM;
 176    }
 177
 178    if (normalized) {
 179       switch (type) {
 180       case GL_DOUBLE: return double_types[size-1];
 181       case GL_FLOAT: return float_types[size-1];
 182       case GL_INT: return int_types_norm[size-1];
 183       case GL_SHORT: return short_types_norm[size-1];
 184       case GL_BYTE: return byte_types_norm[size-1];
 185       case GL_UNSIGNED_INT: return uint_types_norm[size-1];
 186       case GL_UNSIGNED_SHORT: return ushort_types_norm[size-1];
 187       case GL_UNSIGNED_BYTE: return ubyte_types_norm[size-1];
 188       case GL_FIXED: return fixed_types[size-1];
 189       default: assert(0); return 0;
 190       }
 191    }
 192    else {
 193       switch (type) {
 194       case GL_DOUBLE: return double_types[size-1];
 195       case GL_FLOAT: return float_types[size-1];
 196       case GL_INT: return int_types_scale[size-1];
 197       case GL_SHORT: return short_types_scale[size-1];
 198       case GL_BYTE: return byte_types_scale[size-1];
 199       case GL_UNSIGNED_INT: return uint_types_scale[size-1];
 200       case GL_UNSIGNED_SHORT: return ushort_types_scale[size-1];
 201       case GL_UNSIGNED_BYTE: return ubyte_types_scale[size-1];
 202       case GL_FIXED: return fixed_types[size-1];
 203       default: assert(0); return 0;
 204       }
 205    }
 206    return 0; /* silence compiler warning */
 207 }
 208
 209
 210 /*
 211  * If edge flags are needed, setup an bitvector of flags and call
 212  * pipe->set_edgeflags().
 213  * XXX memleak: need to free the returned pointer at some point
 214  */
 215 static void *
 216 setup_edgeflags(GLcontext *ctx, GLenum primMode, GLint start, GLint count,
 217                 const struct gl_client_array *array)
 218 {
 219    struct pipe_context *pipe = ctx->st->pipe;
 220
 221    if ((primMode == GL_TRIANGLES ||
 222         primMode == GL_QUADS ||
 223         primMode == GL_POLYGON) &&
 224        (ctx->Polygon.FrontMode != GL_FILL ||
 225         ctx->Polygon.BackMode != GL_FILL)) {
 226       /* need edge flags */
 227       GLint i;
 228       unsigned *vec;
 229       struct st_buffer_object *stobj = st_buffer_object(array->BufferObj);
 230       ubyte *map;
 231
 232       if (!stobj)
 233          return NULL;
 234
 235       vec = (unsigned *) _mesa_calloc(sizeof(unsigned) * ((count + 31) / 32));
 236       if (!vec)
 237          return NULL;
 238
 239       map = pipe_buffer_map(pipe->screen, stobj->buffer, PIPE_BUFFER_USAGE_CPU_READ);
 240       map = ADD_POINTERS(map, array->Ptr);
 241
 242       for (i = 0; i < count; i++) {
 243          if (*((float *) map))
 244             vec[i/32] |= 1 << (i % 32);
 245
 246          map += array->StrideB;
 247       }
 248
 249       pipe_buffer_unmap(pipe->screen, stobj->buffer);
 250
 251       pipe->set_edgeflags(pipe, vec);
 252
 253       return vec;
 254    }
 255    else {
 256       /* edge flags not needed */
 257       pipe->set_edgeflags(pipe, NULL);
 258       return NULL;
 259    }
 260 }
 261
 262
 263 /**
 264  * Examine the active arrays to determine if we have interleaved
 265  * vertex arrays all living in one VBO, or all living in user space.
 266  * \param userSpace  returns whether the arrays are in user space.
 267  */
 268 static GLboolean
 269 is_interleaved_arrays(const struct st_vertex_program *vp,
 270                       const struct gl_client_array **arrays,
 271                       GLboolean *userSpace)
 272 {
 273    GLuint attr;
 274    const struct gl_buffer_object *firstBufObj = NULL;
 275    GLint firstStride = -1;
 276    GLuint num_client_arrays = 0;
 277    const GLubyte *client_addr = NULL;
 278
 279    for (attr = 0; attr < vp->num_inputs; attr++) {
 280       const GLuint mesaAttr = vp->index_to_input[attr];
 281       const struct gl_buffer_object *bufObj = arrays[mesaAttr]->BufferObj;
 282       const GLsizei stride = arrays[mesaAttr]->StrideB; /* in bytes */
 283
 284       if (firstStride < 0) {
 285          firstStride = stride;
 286       }
 287       else if (firstStride != stride) {
 288          return GL_FALSE;
 289       }
 290
 291       if (!bufObj || !bufObj->Name) {
 292          num_client_arrays++;
 293          /* Try to detect if the client-space arrays are
 294           * "close" to each other.
 295           */
 296          if (!client_addr) {
 297             client_addr = arrays[mesaAttr]->Ptr;
 298          }
 299          else if (abs(arrays[mesaAttr]->Ptr - client_addr) > firstStride) {
 300             /* arrays start too far apart */
 301             return GL_FALSE;
 302          }
 303       }
 304       else if (!firstBufObj) {
 305          firstBufObj = bufObj;
 306       }
 307       else if (bufObj != firstBufObj) {
 308          return GL_FALSE;
 309       }
 310    }
 311
 312    *userSpace = (num_client_arrays == vp->num_inputs);
 313    /* printf("user space: %d (%d %d)\n", (int) *userSpace,num_client_arrays,vp->num_inputs); */
 314
 315    return GL_TRUE;
 316 }
 317
 318
 319 /**
 320  * Compute the memory range occupied by the arrays.
 321  */
 322 static void
 323 get_arrays_bounds(const struct st_vertex_program *vp,
 324                        const struct gl_client_array **arrays,
 325                        GLuint max_index,
 326                        const GLubyte **low, const GLubyte **high)
 327 {
 328    const GLubyte *low_addr = NULL;
 329    GLuint attr;
 330    GLint stride;
 331
 332    for (attr = 0; attr < vp->num_inputs; attr++) {
 333       const GLuint mesaAttr = vp->index_to_input[attr];
 334       const GLubyte *start = arrays[mesaAttr]->Ptr;
 335       stride = arrays[mesaAttr]->StrideB;
 336       if (attr == 0) {
 337          low_addr = start;
 338       }
 339       else {
 340          low_addr = MIN2(low_addr, start);
 341       }
 342    }
 343
 344    *low = low_addr;
 345    *high = low_addr + (max_index + 1) * stride;
 346 }
 347
 348
 349 /**
 350  * Set up for drawing interleaved arrays that all live in one VBO
 351  * or all live in user space.
 352  * \param vbuffer  returns vertex buffer info
 353  * \param velements  returns vertex element info
 354  */
 355 static void
 356 setup_interleaved_attribs(GLcontext *ctx,
 357                           const struct st_vertex_program *vp,
 358                           const struct gl_client_array **arrays,
 359                           GLuint max_index,
 360                           GLboolean userSpace,
 361                           struct pipe_vertex_buffer *vbuffer,
 362                           struct pipe_vertex_element velements[])
 363 {
 364    struct pipe_context *pipe = ctx->st->pipe;
 365    GLuint attr;
 366    const GLubyte *offset0;
 367
 368    for (attr = 0; attr < vp->num_inputs; attr++) {
 369       const GLuint mesaAttr = vp->index_to_input[attr];
 370       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 371       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 372       GLsizei stride = arrays[mesaAttr]->StrideB;
 373
 374       /*printf("stobj %u = %p\n", attr, (void*)stobj);*/
 375
 376       if (attr == 0) {
 377          const GLubyte *low, *high;
 378
 379          get_arrays_bounds(vp, arrays, max_index, &low, &high);
 380          /*printf("buffer range: %p %p  %d\n", low, high, high-low);*/
 381
 382          offset0 = low;
 383          if (userSpace) {
 384             vbuffer->buffer =
 385                pipe_user_buffer_create(pipe->screen, (void *) low, high - low);
 386             vbuffer->buffer_offset = 0;
 387          }
 388          else {
 389             vbuffer->buffer = NULL;
 390             pipe_buffer_reference(&vbuffer->buffer, stobj->buffer);
 391             vbuffer->buffer_offset = pointer_to_offset(low);
 392          }
 393          vbuffer->stride = stride; /* in bytes */
 394          vbuffer->max_index = max_index;
 395       }
 396
 397       velements[attr].src_offset =
 398          (unsigned) (arrays[mesaAttr]->Ptr - offset0);
 399       velements[attr].vertex_buffer_index = 0;
 400       velements[attr].nr_components = arrays[mesaAttr]->Size;
 401       velements[attr].src_format =
 402          st_pipe_vertex_format(arrays[mesaAttr]->Type,
 403                                arrays[mesaAttr]->Size,
 404                                arrays[mesaAttr]->Format,
 405                                arrays[mesaAttr]->Normalized);
 406       assert(velements[attr].src_format);
 407    }
 408 }
 409
 410
 411 /**
 412  * Set up a separate pipe_vertex_buffer and pipe_vertex_element for each
 413  * vertex attribute.
 414  * \param vbuffer  returns vertex buffer info
 415  * \param velements  returns vertex element info
 416  */
 417 static void
 418 setup_non_interleaved_attribs(GLcontext *ctx,
 419                               const struct st_vertex_program *vp,
 420                               const struct gl_client_array **arrays,
 421                               GLuint max_index,
 422                               GLboolean *userSpace,
 423                               struct pipe_vertex_buffer vbuffer[],
 424                               struct pipe_vertex_element velements[])
 425 {
 426    struct pipe_context *pipe = ctx->st->pipe;
 427    GLuint attr;
 428
 429    for (attr = 0; attr < vp->num_inputs; attr++) {
 430       const GLuint mesaAttr = vp->index_to_input[attr];
 431       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 432       GLsizei stride = arrays[mesaAttr]->StrideB;
 433
 434       *userSpace = GL_FALSE;
 435
 436       if (bufobj && bufobj->Name) {
 437          /* Attribute data is in a VBO.
 438           * Recall that for VBOs, the gl_client_array->Ptr field is
 439           * really an offset from the start of the VBO, not a pointer.
 440           */
 441          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 442          assert(stobj->buffer);
 443          /*printf("stobj %u = %p\n", attr, (void*) stobj);*/
 444
 445          vbuffer[attr].buffer = NULL;
 446          pipe_buffer_reference(&vbuffer[attr].buffer, stobj->buffer);
 447          vbuffer[attr].buffer_offset = pointer_to_offset(arrays[mesaAttr]->Ptr);
 448          velements[attr].src_offset = 0;
 449       }
 450       else {
 451          /* attribute data is in user-space memory, not a VBO */
 452          uint bytes;
 453          /*printf("user-space array %d stride %d\n", attr, stride);*/
 454
 455          *userSpace = GL_TRUE;
 456
 457          /* wrap user data */
 458          if (arrays[mesaAttr]->Ptr) {
 459             /* user's vertex array */
 460             if (arrays[mesaAttr]->StrideB) {
 461                bytes = arrays[mesaAttr]->StrideB * (max_index + 1);
 462             }
 463             else {
 464                bytes = arrays[mesaAttr]->Size
 465                   * _mesa_sizeof_type(arrays[mesaAttr]->Type);
 466             }
 467             vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
 468                            (void *) arrays[mesaAttr]->Ptr, bytes);
 469          }
 470          else {
 471             /* no array, use ctx->Current.Attrib[] value */
 472             bytes = sizeof(ctx->Current.Attrib[0]);
 473             vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
 474                            (void *) ctx->Current.Attrib[mesaAttr], bytes);
 475             stride = 0;
 476          }
 477
 478          vbuffer[attr].buffer_offset = 0;
 479          velements[attr].src_offset = 0;
 480       }
 481
 482       assert(velements[attr].src_offset <= 2048); /* 11-bit field */
 483
 484       /* common-case setup */
 485       vbuffer[attr].stride = stride; /* in bytes */
 486       vbuffer[attr].max_index = max_index;
 487       velements[attr].vertex_buffer_index = attr;
 488       velements[attr].nr_components = arrays[mesaAttr]->Size;
 489       velements[attr].src_format
 490          = st_pipe_vertex_format(arrays[mesaAttr]->Type,
 491                                  arrays[mesaAttr]->Size,
 492                                  arrays[mesaAttr]->Format,
 493                                  arrays[mesaAttr]->Normalized);
 494       assert(velements[attr].src_format);
 495    }
 496 }
 497
 498
 499
 500 /**
 501  * Prior to drawing, check that any uniforms referenced by the
 502  * current shader have been set.  If a uniform has not been set,
 503  * issue a warning.
 504  */
 505 static void
 506 check_uniforms(GLcontext *ctx)
 507 {
 508    const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
 509    if (shProg && shProg->LinkStatus) {
 510       GLuint i;
 511       for (i = 0; i < shProg->Uniforms->NumUniforms; i++) {
 512          const struct gl_uniform *u = &shProg->Uniforms->Uniforms[i];
 513          if (!u->Initialized) {
 514             _mesa_warning(ctx,
 515                           "Using shader with uninitialized uniform: %s",
 516                           u->Name);
 517          }
 518       }
 519    }
 520 }
 521
 522
 523 /**
 524  * This function gets plugged into the VBO module and is called when
 525  * we have something to render.
 526  * Basically, translate the information into the format expected by gallium.
 527  */
 528 void
 529 st_draw_vbo(GLcontext *ctx,
 530             const struct gl_client_array **arrays,
 531             const struct _mesa_prim *prims,
 532             GLuint nr_prims,
 533             const struct _mesa_index_buffer *ib,
 534             GLuint min_index,
 535             GLuint max_index)
 536 {
 537    struct pipe_context *pipe = ctx->st->pipe;
 538    const struct st_vertex_program *vp;
 539    const struct pipe_shader_state *vs;
 540    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 541    GLuint attr;
 542    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 543    unsigned num_vbuffers, num_velements;
 544    GLboolean userSpace;
 545
 546    /* sanity check for pointer arithmetic below */
 547    assert(sizeof(arrays[0]->Ptr[0]) == 1);
 548
 549    st_validate_state(ctx->st);
 550
 551    /* must get these after state validation! */
 552    vp = ctx->st->vp;
 553    vs = &ctx->st->vp->state;
 554
 555 #if 0
 556    if (MESA_VERBOSE & VERBOSE_GLSL) {
 557       check_uniforms(ctx);
 558    }
 559 #else
 560    (void) check_uniforms;
 561 #endif
 562
 563    /*
 564     * Setup the vbuffer[] and velements[] arrays.
 565     */
 566    if (is_interleaved_arrays(vp, arrays, &userSpace)) {
 567       /*printf("Draw interleaved\n");*/
 568       setup_interleaved_attribs(ctx, vp, arrays, max_index, userSpace,
 569                                 vbuffer, velements);
 570       num_vbuffers = 1;
 571       num_velements = vp->num_inputs;
 572       if (num_velements == 0)
 573          num_vbuffers = 0;
 574    }
 575    else {
 576       /*printf("Draw non-interleaved\n");*/
 577       setup_non_interleaved_attribs(ctx, vp, arrays, max_index,
 578                                     &userSpace, vbuffer, velements);
 579       num_vbuffers = vp->num_inputs;
 580       num_velements = vp->num_inputs;
 581    }
 582
 583 #if 0
 584    {
 585       GLuint i;
 586       for (i = 0; i < num_vbuffers; i++) {
 587          printf("buffers[%d].stride = %u\n", i, vbuffer[i].stride);
 588          printf("buffers[%d].max_index = %u\n", i, vbuffer[i].max_index);
 589          printf("buffers[%d].buffer_offset = %u\n", i, vbuffer[i].buffer_offset);
 590          printf("buffers[%d].buffer = %p\n", i, (void*) vbuffer[i].buffer);
 591       }
 592       for (i = 0; i < num_velements; i++) {
 593          printf("vlements[%d].vbuffer_index = %u\n", i, velements[i].vertex_buffer_index);
 594          printf("vlements[%d].src_offset = %u\n", i, velements[i].src_offset);
 595          printf("vlements[%d].nr_comps = %u\n", i, velements[i].nr_components);
 596          printf("vlements[%d].format = %s\n", i, pf_name(velements[i].src_format));
 597       }
 598    }
 599 #endif
 600
 601    pipe->set_vertex_buffers(pipe, num_vbuffers, vbuffer);
 602    pipe->set_vertex_elements(pipe, num_velements, velements);
 603
 604    if (num_vbuffers == 0 || num_velements == 0)
 605       return;
 606
 607    /* do actual drawing */
 608    if (ib) {
 609       /* indexed primitive */
 610       struct gl_buffer_object *bufobj = ib->obj;
 611       struct pipe_buffer *indexBuf = NULL;
 612       unsigned indexSize, indexOffset, i;
 613
 614       switch (ib->type) {
 615       case GL_UNSIGNED_INT:
 616          indexSize = 4;
 617          break;
 618       case GL_UNSIGNED_SHORT:
 619          indexSize = 2;
 620          break;
 621       case GL_UNSIGNED_BYTE:
 622          indexSize = 1;
 623          break;
 624       default:
 625          assert(0);
 626          return;
 627       }
 628
 629       /* get/create the index buffer object */
 630       if (bufobj && bufobj->Name) {
 631          /* elements/indexes are in a real VBO */
 632          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 633          pipe_buffer_reference(&indexBuf, stobj->buffer);
 634          indexOffset = pointer_to_offset(ib->ptr) / indexSize;
 635       }
 636       else {
 637          /* element/indicies are in user space memory */
 638          indexBuf = pipe_user_buffer_create(pipe->screen, (void *) ib->ptr,
 639                                             ib->count * indexSize);
 640          indexOffset = 0;
 641       }
 642
 643       /* draw */
 644       if (nr_prims == 1 && pipe->draw_range_elements != NULL) {
 645          i = 0;
 646
 647          /* XXX: exercise temporary path to pass min/max directly
 648           * through to driver & draw module.  These interfaces still
 649           * need a bit of work...
 650           */
 651          setup_edgeflags(ctx, prims[i].mode,
 652                          prims[i].start + indexOffset, prims[i].count,
 653                          arrays[VERT_ATTRIB_EDGEFLAG]);
 654
 655          pipe->draw_range_elements(pipe, indexBuf, indexSize,
 656                                    min_index,
 657                                    max_index,
 658                                    prims[i].mode,
 659                                    prims[i].start + indexOffset, prims[i].count);
 660       }
 661       else {
 662          for (i = 0; i < nr_prims; i++) {
 663             setup_edgeflags(ctx, prims[i].mode,
 664                             prims[i].start + indexOffset, prims[i].count,
 665                             arrays[VERT_ATTRIB_EDGEFLAG]);
 666
 667             pipe->draw_elements(pipe, indexBuf, indexSize,
 668                                 prims[i].mode,
 669                                 prims[i].start + indexOffset, prims[i].count);
 670          }
 671       }
 672
 673       pipe_buffer_reference(&indexBuf, NULL);
 674    }
 675    else {
 676       /* non-indexed */
 677       GLuint i;
 678       for (i = 0; i < nr_prims; i++) {
 679          setup_edgeflags(ctx, prims[i].mode,
 680                          prims[i].start, prims[i].count,
 681                          arrays[VERT_ATTRIB_EDGEFLAG]);
 682
 683          pipe->draw_arrays(pipe, prims[i].mode, prims[i].start, prims[i].count);
 684       }
 685    }
 686
 687    /* unreference buffers (frees wrapped user-space buffer objects) */
 688    for (attr = 0; attr < num_vbuffers; attr++) {
 689       pipe_buffer_reference(&vbuffer[attr].buffer, NULL);
 690       assert(!vbuffer[attr].buffer);
 691    }
 692
 693    if (userSpace)
 694    {
 695       pipe->set_vertex_buffers(pipe, 0, NULL);
 696    }
 697 }
 698
 699
 700 void st_init_draw( struct st_context *st )
 701 {
 702    GLcontext *ctx = st->ctx;
 703
 704    vbo_set_draw_func(ctx, st_draw_vbo);
 705 }
 706
 707
 708 void st_destroy_draw( struct st_context *st )
 709 {
 710 }
 711
 712