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 gl_client_array **arrays,
 231                       GLboolean *userSpace)
 232 {
 233    GLuint attr;
 234    const struct gl_buffer_object *firstBufObj = NULL;
 235    GLint firstStride = -1;
 236    GLuint num_client_arrays = 0;
 237    const GLubyte *client_addr = NULL;
 238
 239    for (attr = 0; attr < vp->num_inputs; attr++) {
 240       const GLuint mesaAttr = vp->index_to_input[attr];
 241       const struct gl_buffer_object *bufObj = arrays[mesaAttr]->BufferObj;
 242       const GLsizei stride = arrays[mesaAttr]->StrideB; /* in bytes */
 243
 244       if (firstStride < 0) {
 245          firstStride = stride;
 246       }
 247       else if (firstStride != stride) {
 248          return GL_FALSE;
 249       }
 250
 251       if (!bufObj || !bufObj->Name) {
 252          num_client_arrays++;
 253          /* Try to detect if the client-space arrays are
 254           * "close" to each other.
 255           */
 256          if (!client_addr) {
 257             client_addr = arrays[mesaAttr]->Ptr;
 258          }
 259          else if (abs(arrays[mesaAttr]->Ptr - client_addr) > firstStride) {
 260             /* arrays start too far apart */
 261             return GL_FALSE;
 262          }
 263       }
 264       else if (!firstBufObj) {
 265          firstBufObj = bufObj;
 266       }
 267       else if (bufObj != firstBufObj) {
 268          return GL_FALSE;
 269       }
 270    }
 271
 272    *userSpace = (num_client_arrays == vp->num_inputs);
 273    /* printf("user space: %d (%d %d)\n", (int) *userSpace,num_client_arrays,vp->num_inputs); */
 274
 275    return GL_TRUE;
 276 }
 277
 278
 279 /**
 280  * Compute the memory range occupied by the arrays.
 281  */
 282 static void
 283 get_arrays_bounds(const struct st_vertex_program *vp,
 284                        const struct gl_client_array **arrays,
 285                        GLuint max_index,
 286                        const GLubyte **low, const GLubyte **high)
 287 {
 288    const GLubyte *low_addr = NULL;
 289    const GLubyte *high_addr = NULL;
 290    GLuint attr;
 291
 292    for (attr = 0; attr < vp->num_inputs; attr++) {
 293       const GLuint mesaAttr = vp->index_to_input[attr];
 294       const GLint stride = arrays[mesaAttr]->StrideB;
 295       const GLubyte *start = arrays[mesaAttr]->Ptr;
 296       const unsigned sz = (arrays[mesaAttr]->Size *
 297                            _mesa_sizeof_type(arrays[mesaAttr]->Type));
 298       const GLubyte *end = start + (max_index * stride) + sz;
 299
 300       if (attr == 0) {
 301          low_addr = start;
 302          high_addr = end;
 303       }
 304       else {
 305          low_addr = MIN2(low_addr, start);
 306          high_addr = MAX2(high_addr, end);
 307       }
 308    }
 309
 310    *low = low_addr;
 311    *high = high_addr;
 312 }
 313
 314
 315 /**
 316  * Set up for drawing interleaved arrays that all live in one VBO
 317  * or all live in user space.
 318  * \param vbuffer  returns vertex buffer info
 319  * \param velements  returns vertex element info
 320  */
 321 static void
 322 setup_interleaved_attribs(GLcontext *ctx,
 323                           const struct st_vertex_program *vp,
 324                           const struct gl_client_array **arrays,
 325                           GLuint max_index,
 326                           GLboolean userSpace,
 327                           struct pipe_vertex_buffer *vbuffer,
 328                           struct pipe_vertex_element velements[])
 329 {
 330    struct pipe_context *pipe = ctx->st->pipe;
 331    GLuint attr;
 332    const GLubyte *offset0;
 333
 334    for (attr = 0; attr < vp->num_inputs; attr++) {
 335       const GLuint mesaAttr = vp->index_to_input[attr];
 336       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 337       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 338       GLsizei stride = arrays[mesaAttr]->StrideB;
 339
 340       /*printf("stobj %u = %p\n", attr, (void*)stobj);*/
 341
 342       if (attr == 0) {
 343          const GLubyte *low, *high;
 344
 345          get_arrays_bounds(vp, arrays, max_index, &low, &high);
 346          /*printf("buffer range: %p %p  %d\n", low, high, high-low);*/
 347
 348          offset0 = low;
 349          if (userSpace) {
 350             vbuffer->buffer =
 351                pipe_user_buffer_create(pipe->screen, (void *) low, high - low);
 352             vbuffer->buffer_offset = 0;
 353          }
 354          else {
 355             vbuffer->buffer = NULL;
 356             pipe_buffer_reference(&vbuffer->buffer, stobj->buffer);
 357             vbuffer->buffer_offset = pointer_to_offset(low);
 358          }
 359          vbuffer->stride = stride; /* in bytes */
 360          vbuffer->max_index = max_index;
 361       }
 362
 363       velements[attr].src_offset =
 364          (unsigned) (arrays[mesaAttr]->Ptr - offset0);
 365       velements[attr].vertex_buffer_index = 0;
 366       velements[attr].nr_components = arrays[mesaAttr]->Size;
 367       velements[attr].src_format =
 368          st_pipe_vertex_format(arrays[mesaAttr]->Type,
 369                                arrays[mesaAttr]->Size,
 370                                arrays[mesaAttr]->Format,
 371                                arrays[mesaAttr]->Normalized);
 372       assert(velements[attr].src_format);
 373    }
 374 }
 375
 376
 377 /**
 378  * Set up a separate pipe_vertex_buffer and pipe_vertex_element for each
 379  * vertex attribute.
 380  * \param vbuffer  returns vertex buffer info
 381  * \param velements  returns vertex element info
 382  */
 383 static void
 384 setup_non_interleaved_attribs(GLcontext *ctx,
 385                               const struct st_vertex_program *vp,
 386                               const struct gl_client_array **arrays,
 387                               GLuint max_index,
 388                               GLboolean *userSpace,
 389                               struct pipe_vertex_buffer vbuffer[],
 390                               struct pipe_vertex_element velements[])
 391 {
 392    struct pipe_context *pipe = ctx->st->pipe;
 393    GLuint attr;
 394
 395    for (attr = 0; attr < vp->num_inputs; attr++) {
 396       const GLuint mesaAttr = vp->index_to_input[attr];
 397       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 398       GLsizei stride = arrays[mesaAttr]->StrideB;
 399
 400       *userSpace = GL_FALSE;
 401
 402       if (bufobj && bufobj->Name) {
 403          /* Attribute data is in a VBO.
 404           * Recall that for VBOs, the gl_client_array->Ptr field is
 405           * really an offset from the start of the VBO, not a pointer.
 406           */
 407          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 408          assert(stobj->buffer);
 409          /*printf("stobj %u = %p\n", attr, (void*) stobj);*/
 410
 411          vbuffer[attr].buffer = NULL;
 412          pipe_buffer_reference(&vbuffer[attr].buffer, stobj->buffer);
 413          vbuffer[attr].buffer_offset = pointer_to_offset(arrays[mesaAttr]->Ptr);
 414          velements[attr].src_offset = 0;
 415       }
 416       else {
 417          /* attribute data is in user-space memory, not a VBO */
 418          uint bytes;
 419          /*printf("user-space array %d stride %d\n", attr, stride);*/
 420
 421          *userSpace = GL_TRUE;
 422
 423          /* wrap user data */
 424          if (arrays[mesaAttr]->Ptr) {
 425             /* user's vertex array */
 426             if (arrays[mesaAttr]->StrideB) {
 427                bytes = arrays[mesaAttr]->StrideB * (max_index + 1);
 428             }
 429             else {
 430                bytes = arrays[mesaAttr]->Size
 431                   * _mesa_sizeof_type(arrays[mesaAttr]->Type);
 432             }
 433             vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
 434                            (void *) arrays[mesaAttr]->Ptr, bytes);
 435          }
 436          else {
 437             /* no array, use ctx->Current.Attrib[] value */
 438             bytes = sizeof(ctx->Current.Attrib[0]);
 439             vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
 440                            (void *) ctx->Current.Attrib[mesaAttr], bytes);
 441             stride = 0;
 442          }
 443
 444          vbuffer[attr].buffer_offset = 0;
 445          velements[attr].src_offset = 0;
 446       }
 447
 448       assert(velements[attr].src_offset <= 2048); /* 11-bit field */
 449
 450       /* common-case setup */
 451       vbuffer[attr].stride = stride; /* in bytes */
 452       vbuffer[attr].max_index = max_index;
 453       velements[attr].vertex_buffer_index = attr;
 454       velements[attr].nr_components = arrays[mesaAttr]->Size;
 455       velements[attr].src_format
 456          = st_pipe_vertex_format(arrays[mesaAttr]->Type,
 457                                  arrays[mesaAttr]->Size,
 458                                  arrays[mesaAttr]->Format,
 459                                  arrays[mesaAttr]->Normalized);
 460       assert(velements[attr].src_format);
 461    }
 462 }
 463
 464
 465
 466 /**
 467  * Prior to drawing, check that any uniforms referenced by the
 468  * current shader have been set.  If a uniform has not been set,
 469  * issue a warning.
 470  */
 471 static void
 472 check_uniforms(GLcontext *ctx)
 473 {
 474    const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
 475    if (shProg && shProg->LinkStatus) {
 476       GLuint i;
 477       for (i = 0; i < shProg->Uniforms->NumUniforms; i++) {
 478          const struct gl_uniform *u = &shProg->Uniforms->Uniforms[i];
 479          if (!u->Initialized) {
 480             _mesa_warning(ctx,
 481                           "Using shader with uninitialized uniform: %s",
 482                           u->Name);
 483          }
 484       }
 485    }
 486 }
 487
 488
 489 /**
 490  * This function gets plugged into the VBO module and is called when
 491  * we have something to render.
 492  * Basically, translate the information into the format expected by gallium.
 493  */
 494 void
 495 st_draw_vbo(GLcontext *ctx,
 496             const struct gl_client_array **arrays,
 497             const struct _mesa_prim *prims,
 498             GLuint nr_prims,
 499             const struct _mesa_index_buffer *ib,
 500             GLboolean index_bounds_valid,
 501             GLuint min_index,
 502             GLuint max_index)
 503 {
 504    struct pipe_context *pipe = ctx->st->pipe;
 505    const struct st_vertex_program *vp;
 506    const struct pipe_shader_state *vs;
 507    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 508    GLuint attr;
 509    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 510    unsigned num_vbuffers, num_velements;
 511    GLboolean userSpace;
 512
 513    /* Gallium probably doesn't want this in some cases. */
 514    if (!index_bounds_valid)
 515       vbo_get_minmax_index(ctx, prims, ib, &min_index, &max_index);
 516
 517    /* sanity check for pointer arithmetic below */
 518    assert(sizeof(arrays[0]->Ptr[0]) == 1);
 519
 520    st_validate_state(ctx->st);
 521
 522    /* must get these after state validation! */
 523    vp = ctx->st->vp;
 524    vs = &ctx->st->vp_varient->state;
 525
 526 #if 0
 527    if (MESA_VERBOSE & VERBOSE_GLSL) {
 528       check_uniforms(ctx);
 529    }
 530 #else
 531    (void) check_uniforms;
 532 #endif
 533
 534    /*
 535     * Setup the vbuffer[] and velements[] arrays.
 536     */
 537    if (is_interleaved_arrays(vp, arrays, &userSpace)) {
 538       /*printf("Draw interleaved\n");*/
 539       setup_interleaved_attribs(ctx, vp, arrays, max_index, userSpace,
 540                                 vbuffer, velements);
 541       num_vbuffers = 1;
 542       num_velements = vp->num_inputs;
 543       if (num_velements == 0)
 544          num_vbuffers = 0;
 545    }
 546    else {
 547       /*printf("Draw non-interleaved\n");*/
 548       setup_non_interleaved_attribs(ctx, vp, arrays, max_index,
 549                                     &userSpace, vbuffer, velements);
 550       num_vbuffers = vp->num_inputs;
 551       num_velements = vp->num_inputs;
 552    }
 553
 554 #if 0
 555    {
 556       GLuint i;
 557       for (i = 0; i < num_vbuffers; i++) {
 558          printf("buffers[%d].stride = %u\n", i, vbuffer[i].stride);
 559          printf("buffers[%d].max_index = %u\n", i, vbuffer[i].max_index);
 560          printf("buffers[%d].buffer_offset = %u\n", i, vbuffer[i].buffer_offset);
 561          printf("buffers[%d].buffer = %p\n", i, (void*) vbuffer[i].buffer);
 562       }
 563       for (i = 0; i < num_velements; i++) {
 564          printf("vlements[%d].vbuffer_index = %u\n", i, velements[i].vertex_buffer_index);
 565          printf("vlements[%d].src_offset = %u\n", i, velements[i].src_offset);
 566          printf("vlements[%d].nr_comps = %u\n", i, velements[i].nr_components);
 567          printf("vlements[%d].format = %s\n", i, pf_name(velements[i].src_format));
 568       }
 569    }
 570 #endif
 571
 572    pipe->set_vertex_buffers(pipe, num_vbuffers, vbuffer);
 573    pipe->set_vertex_elements(pipe, num_velements, velements);
 574
 575    if (num_vbuffers == 0 || num_velements == 0)
 576       return;
 577
 578    /* do actual drawing */
 579    if (ib) {
 580       /* indexed primitive */
 581       struct gl_buffer_object *bufobj = ib->obj;
 582       struct pipe_buffer *indexBuf = NULL;
 583       unsigned indexSize, indexOffset, i;
 584
 585       switch (ib->type) {
 586       case GL_UNSIGNED_INT:
 587          indexSize = 4;
 588          break;
 589       case GL_UNSIGNED_SHORT:
 590          indexSize = 2;
 591          break;
 592       case GL_UNSIGNED_BYTE:
 593          indexSize = 1;
 594          break;
 595       default:
 596          assert(0);
 597          return;
 598       }
 599
 600       /* get/create the index buffer object */
 601       if (bufobj && bufobj->Name) {
 602          /* elements/indexes are in a real VBO */
 603          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 604          pipe_buffer_reference(&indexBuf, stobj->buffer);
 605          indexOffset = pointer_to_offset(ib->ptr) / indexSize;
 606       }
 607       else {
 608          /* element/indicies are in user space memory */
 609          indexBuf = pipe_user_buffer_create(pipe->screen, (void *) ib->ptr,
 610                                             ib->count * indexSize);
 611          indexOffset = 0;
 612       }
 613
 614       /* draw */
 615       if (nr_prims == 1 && pipe->draw_range_elements != NULL) {
 616          i = 0;
 617
 618          /* XXX: exercise temporary path to pass min/max directly
 619           * through to driver & draw module.  These interfaces still
 620           * need a bit of work...
 621           */
 622          pipe->draw_range_elements(pipe, indexBuf, indexSize,
 623                                    min_index,
 624                                    max_index,
 625                                    prims[i].mode,
 626                                    prims[i].start + indexOffset, prims[i].count);
 627       }
 628       else {
 629          for (i = 0; i < nr_prims; i++) {
 630             pipe->draw_elements(pipe, indexBuf, indexSize,
 631                                 prims[i].mode,
 632                                 prims[i].start + indexOffset, prims[i].count);
 633          }
 634       }
 635
 636       pipe_buffer_reference(&indexBuf, NULL);
 637    }
 638    else {
 639       /* non-indexed */
 640       GLuint i;
 641       for (i = 0; i < nr_prims; i++) {
 642          pipe->draw_arrays(pipe, prims[i].mode, prims[i].start, prims[i].count);
 643       }
 644    }
 645
 646    /* unreference buffers (frees wrapped user-space buffer objects) */
 647    for (attr = 0; attr < num_vbuffers; attr++) {
 648       pipe_buffer_reference(&vbuffer[attr].buffer, NULL);
 649       assert(!vbuffer[attr].buffer);
 650    }
 651
 652    if (userSpace)
 653    {
 654       pipe->set_vertex_buffers(pipe, 0, NULL);
 655    }
 656 }
 657
 658
 659 void st_init_draw( struct st_context *st )
 660 {
 661    GLcontext *ctx = st->ctx;
 662
 663    vbo_set_draw_func(ctx, st_draw_vbo);
 664 }
 665
 666
 667 void st_destroy_draw( struct st_context *st )
 668 {
 669 }
 670
 671