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
  36 #include "vbo/vbo.h"
  37
  38 #include "st_context.h"
  39 #include "st_atom.h"
  40 #include "st_cb_bufferobjects.h"
  41 #include "st_draw.h"
  42 #include "st_program.h"
  43
  44 #include "pipe/p_context.h"
  45 #include "pipe/p_defines.h"
  46 #include "pipe/p_inlines.h"
  47
  48 #include "draw/draw_private.h"
  49 #include "draw/draw_context.h"
  50
  51
  52 static GLuint double_types[4] = {
  53    PIPE_FORMAT_R64_FLOAT,
  54    PIPE_FORMAT_R64G64_FLOAT,
  55    PIPE_FORMAT_R64G64B64_FLOAT,
  56    PIPE_FORMAT_R64G64B64A64_FLOAT
  57 };
  58
  59 static GLuint float_types[4] = {
  60    PIPE_FORMAT_R32_FLOAT,
  61    PIPE_FORMAT_R32G32_FLOAT,
  62    PIPE_FORMAT_R32G32B32_FLOAT,
  63    PIPE_FORMAT_R32G32B32A32_FLOAT
  64 };
  65
  66 static GLuint uint_types_norm[4] = {
  67    PIPE_FORMAT_R32_UNORM,
  68    PIPE_FORMAT_R32G32_UNORM,
  69    PIPE_FORMAT_R32G32B32_UNORM,
  70    PIPE_FORMAT_R32G32B32A32_UNORM
  71 };
  72
  73 static GLuint uint_types_scale[4] = {
  74    PIPE_FORMAT_R32_USCALED,
  75    PIPE_FORMAT_R32G32_USCALED,
  76    PIPE_FORMAT_R32G32B32_USCALED,
  77    PIPE_FORMAT_R32G32B32A32_USCALED
  78 };
  79
  80 static GLuint int_types_norm[4] = {
  81    PIPE_FORMAT_R32_SNORM,
  82    PIPE_FORMAT_R32G32_SNORM,
  83    PIPE_FORMAT_R32G32B32_SNORM,
  84    PIPE_FORMAT_R32G32B32A32_SNORM
  85 };
  86
  87 static GLuint int_types_scale[4] = {
  88    PIPE_FORMAT_R32_SSCALED,
  89    PIPE_FORMAT_R32G32_SSCALED,
  90    PIPE_FORMAT_R32G32B32_SSCALED,
  91    PIPE_FORMAT_R32G32B32A32_SSCALED
  92 };
  93
  94 static GLuint ushort_types_norm[4] = {
  95    PIPE_FORMAT_R16_UNORM,
  96    PIPE_FORMAT_R16G16_UNORM,
  97    PIPE_FORMAT_R16G16B16_UNORM,
  98    PIPE_FORMAT_R16G16B16A16_UNORM
  99 };
 100
 101 static GLuint ushort_types_scale[4] = {
 102    PIPE_FORMAT_R16_USCALED,
 103    PIPE_FORMAT_R16G16_USCALED,
 104    PIPE_FORMAT_R16G16B16_USCALED,
 105    PIPE_FORMAT_R16G16B16A16_USCALED
 106 };
 107
 108 static GLuint short_types_norm[4] = {
 109    PIPE_FORMAT_R16_SNORM,
 110    PIPE_FORMAT_R16G16_SNORM,
 111    PIPE_FORMAT_R16G16B16_SNORM,
 112    PIPE_FORMAT_R16G16B16A16_SNORM
 113 };
 114
 115 static GLuint short_types_scale[4] = {
 116    PIPE_FORMAT_R16_SSCALED,
 117    PIPE_FORMAT_R16G16_SSCALED,
 118    PIPE_FORMAT_R16G16B16_SSCALED,
 119    PIPE_FORMAT_R16G16B16A16_SSCALED
 120 };
 121
 122 static GLuint ubyte_types_norm[4] = {
 123    PIPE_FORMAT_R8_UNORM,
 124    PIPE_FORMAT_R8G8_UNORM,
 125    PIPE_FORMAT_R8G8B8_UNORM,
 126    PIPE_FORMAT_R8G8B8A8_UNORM
 127 };
 128
 129 static GLuint ubyte_types_scale[4] = {
 130    PIPE_FORMAT_R8_USCALED,
 131    PIPE_FORMAT_R8G8_USCALED,
 132    PIPE_FORMAT_R8G8B8_USCALED,
 133    PIPE_FORMAT_R8G8B8A8_USCALED
 134 };
 135
 136 static GLuint byte_types_norm[4] = {
 137    PIPE_FORMAT_R8_SNORM,
 138    PIPE_FORMAT_R8G8_SNORM,
 139    PIPE_FORMAT_R8G8B8_SNORM,
 140    PIPE_FORMAT_R8G8B8A8_SNORM
 141 };
 142
 143 static GLuint byte_types_scale[4] = {
 144    PIPE_FORMAT_R8_SSCALED,
 145    PIPE_FORMAT_R8G8_SSCALED,
 146    PIPE_FORMAT_R8G8B8_SSCALED,
 147    PIPE_FORMAT_R8G8B8A8_SSCALED
 148 };
 149
 150
 151 /**
 152  * Return a PIPE_FORMAT_x for the given GL datatype and size.
 153  */
 154 static GLuint
 155 pipe_vertex_format(GLenum type, GLuint size, GLboolean normalized)
 156 {
 157    assert(type >= GL_BYTE);
 158    assert(type <= GL_DOUBLE);
 159    assert(size >= 1);
 160    assert(size <= 4);
 161
 162    if (normalized) {
 163       switch (type) {
 164       case GL_DOUBLE: return double_types[size-1];
 165       case GL_FLOAT: return float_types[size-1];
 166       case GL_INT: return int_types_norm[size-1];
 167       case GL_SHORT: return short_types_norm[size-1];
 168       case GL_BYTE: return byte_types_norm[size-1];
 169       case GL_UNSIGNED_INT: return uint_types_norm[size-1];
 170       case GL_UNSIGNED_SHORT: return ushort_types_norm[size-1];
 171       case GL_UNSIGNED_BYTE: return ubyte_types_norm[size-1];
 172       default: assert(0); return 0;
 173       }
 174    }
 175    else {
 176       switch (type) {
 177       case GL_DOUBLE: return double_types[size-1];
 178       case GL_FLOAT: return float_types[size-1];
 179       case GL_INT: return int_types_scale[size-1];
 180       case GL_SHORT: return short_types_scale[size-1];
 181       case GL_BYTE: return byte_types_scale[size-1];
 182       case GL_UNSIGNED_INT: return uint_types_scale[size-1];
 183       case GL_UNSIGNED_SHORT: return ushort_types_scale[size-1];
 184       case GL_UNSIGNED_BYTE: return ubyte_types_scale[size-1];
 185       default: assert(0); return 0;
 186       }
 187    }
 188    return 0; /* silence compiler warning */
 189 }
 190
 191
 192 /*
 193  * If edge flags are needed, setup an bitvector of flags and call
 194  * pipe->set_edgeflags().
 195  * XXX memleak: need to free the returned pointer at some point
 196  */
 197 static void *
 198 setup_edgeflags(GLcontext *ctx, GLenum primMode, GLint start, GLint count,
 199                 const struct gl_client_array *array)
 200 {
 201    struct pipe_context *pipe = ctx->st->pipe;
 202
 203    if ((primMode == GL_TRIANGLES ||
 204         primMode == GL_QUADS ||
 205         primMode == GL_POLYGON) &&
 206        (ctx->Polygon.FrontMode != GL_FILL ||
 207         ctx->Polygon.BackMode != GL_FILL)) {
 208       /* need edge flags */
 209       GLuint i;
 210       unsigned *vec;
 211       struct st_buffer_object *stobj = st_buffer_object(array->BufferObj);
 212       ubyte *map;
 213
 214       if (!stobj)
 215          return NULL;
 216
 217       vec = (unsigned *) calloc(sizeof(unsigned), (count + 31) / 32);
 218       if (!vec)
 219          return NULL;
 220
 221       map = pipe_buffer_map(pipe, stobj->buffer, PIPE_BUFFER_USAGE_CPU_READ);
 222       map = ADD_POINTERS(map, array->Ptr);
 223
 224       for (i = 0; i < count; i++) {
 225          if (*((float *) map))
 226             vec[i/32] |= 1 << (i % 32);
 227
 228          map += array->StrideB;
 229       }
 230
 231       pipe_buffer_unmap(pipe, stobj->buffer);
 232
 233       pipe->set_edgeflags(pipe, vec);
 234
 235       return vec;
 236    }
 237    else {
 238       /* edge flags not needed */
 239       pipe->set_edgeflags(pipe, NULL);
 240       return NULL;
 241    }
 242 }
 243
 244
 245
 246 /**
 247  * This function gets plugged into the VBO module and is called when
 248  * we have something to render.
 249  * Basically, translate the information into the format expected by pipe.
 250  */
 251 void
 252 st_draw_vbo(GLcontext *ctx,
 253             const struct gl_client_array **arrays,
 254             const struct _mesa_prim *prims,
 255             GLuint nr_prims,
 256             const struct _mesa_index_buffer *ib,
 257             GLuint min_index,
 258             GLuint max_index)
 259 {
 260    struct pipe_context *pipe = ctx->st->pipe;
 261    const struct st_vertex_program *vp;
 262    const struct pipe_shader_state *vs;
 263    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 264    GLuint attr;
 265    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 266
 267    /* sanity check for pointer arithmetic below */
 268    assert(sizeof(arrays[0]->Ptr[0]) == 1);
 269
 270    st_validate_state(ctx->st);
 271
 272    /* must get these after state validation! */
 273    vp = ctx->st->vp;
 274    vs = &ctx->st->vp->state;
 275
 276    /* loop over TGSI shader inputs to determine vertex buffer
 277     * and attribute info
 278     */
 279    for (attr = 0; attr < vp->num_inputs; attr++) {
 280       const GLuint mesaAttr = vp->index_to_input[attr];
 281       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 282
 283       if (bufobj && bufobj->Name) {
 284          /* Attribute data is in a VBO.
 285           * Recall that for VBOs, the gl_client_array->Ptr field is
 286           * really an offset from the start of the VBO, not a pointer.
 287           */
 288          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 289          assert(stobj->buffer);
 290
 291          vbuffer[attr].buffer = NULL;
 292          pipe_reference_buffer(pipe, &vbuffer[attr].buffer, stobj->buffer);
 293          vbuffer[attr].buffer_offset = (unsigned) arrays[0]->Ptr;/* in bytes */
 294          velements[attr].src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
 295          assert(velements[attr].src_offset <= 2048); /* 11-bit field */
 296       }
 297       else {
 298          /* attribute data is in user-space memory, not a VBO */
 299          uint bytes;
 300
 301          if (!arrays[mesaAttr]->StrideB) {
 302             bytes = arrays[mesaAttr]->Size
 303                     * _mesa_sizeof_type(arrays[mesaAttr]->Type);
 304          } else {
 305             bytes = arrays[mesaAttr]->StrideB * (max_index + 1);
 306          }
 307
 308          /* wrap user data */
 309          vbuffer[attr].buffer
 310             = pipe_user_buffer_create(pipe, (void *) arrays[mesaAttr]->Ptr,
 311                                       bytes);
 312          vbuffer[attr].buffer_offset = 0;
 313          velements[attr].src_offset = 0;
 314       }
 315
 316       /* common-case setup */
 317       vbuffer[attr].pitch = arrays[mesaAttr]->StrideB; /* in bytes */
 318       vbuffer[attr].max_index = max_index;
 319       velements[attr].vertex_buffer_index = attr;
 320       velements[attr].nr_components = arrays[mesaAttr]->Size;
 321       velements[attr].src_format
 322          = pipe_vertex_format(arrays[mesaAttr]->Type,
 323                               arrays[mesaAttr]->Size,
 324                               arrays[mesaAttr]->Normalized);
 325       assert(velements[attr].src_format);
 326    }
 327
 328    pipe->set_vertex_buffers(pipe, vp->num_inputs, vbuffer);
 329    pipe->set_vertex_elements(pipe, vp->num_inputs, velements);
 330
 331    /* do actual drawing */
 332    if (ib) {
 333       /* indexed primitive */
 334       struct gl_buffer_object *bufobj = ib->obj;
 335       struct pipe_buffer *indexBuf = NULL;
 336       unsigned indexSize, indexOffset, i;
 337
 338       switch (ib->type) {
 339       case GL_UNSIGNED_INT:
 340          indexSize = 4;
 341          break;
 342       case GL_UNSIGNED_SHORT:
 343          indexSize = 2;
 344          break;
 345       case GL_UNSIGNED_BYTE:
 346          indexSize = 1;
 347          break;
 348       default:
 349          assert(0);
 350          return;
 351       }
 352
 353       /* get/create the index buffer object */
 354       if (bufobj && bufobj->Name) {
 355          /* elements/indexes are in a real VBO */
 356          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 357          pipe_reference_buffer(pipe, &indexBuf, stobj->buffer);
 358          indexOffset = (unsigned) ib->ptr / indexSize;
 359       }
 360       else {
 361          /* element/indicies are in user space memory */
 362          indexBuf = pipe_user_buffer_create(pipe, (void *) ib->ptr,
 363                                             ib->count * indexSize);
 364          indexOffset = 0;
 365       }
 366
 367       /* draw */
 368       for (i = 0; i < nr_prims; i++) {
 369          setup_edgeflags(ctx, prims[i].mode,
 370                          prims[i].start + indexOffset, prims[i].count,
 371                          arrays[VERT_ATTRIB_EDGEFLAG]);
 372
 373          pipe->draw_elements(pipe, indexBuf, indexSize,
 374                              prims[i].mode,
 375                              prims[i].start + indexOffset, prims[i].count);
 376       }
 377
 378       pipe_reference_buffer(pipe, &indexBuf, NULL);
 379    }
 380    else {
 381       /* non-indexed */
 382       GLuint i;
 383       for (i = 0; i < nr_prims; i++) {
 384          setup_edgeflags(ctx, prims[i].mode,
 385                          prims[i].start, prims[i].count,
 386                          arrays[VERT_ATTRIB_EDGEFLAG]);
 387
 388          pipe->draw_arrays(pipe, prims[i].mode, prims[i].start, prims[i].count);
 389       }
 390    }
 391
 392    /* unreference buffers (frees wrapped user-space buffer objects) */
 393    for (attr = 0; attr < vp->num_inputs; attr++) {
 394       pipe_reference_buffer(pipe, &vbuffer[attr].buffer, NULL);
 395       assert(!vbuffer[attr].buffer);
 396    }
 397    pipe->set_vertex_buffers(pipe, vp->num_inputs, vbuffer);
 398 }
 399
 400
 401
 402 /**
 403  * Set the (private) draw module's post-transformed vertex format when in
 404  * GL_SELECT or GL_FEEDBACK mode or for glRasterPos.
 405  */
 406 static void
 407 set_feedback_vertex_format(GLcontext *ctx)
 408 {
 409 #if 0
 410    struct st_context *st = ctx->st;
 411    struct vertex_info vinfo;
 412    GLuint i;
 413
 414    memset(&vinfo, 0, sizeof(vinfo));
 415
 416    if (ctx->RenderMode == GL_SELECT) {
 417       assert(ctx->RenderMode == GL_SELECT);
 418       vinfo.num_attribs = 1;
 419       vinfo.format[0] = FORMAT_4F;
 420       vinfo.interp_mode[0] = INTERP_LINEAR;
 421    }
 422    else {
 423       /* GL_FEEDBACK, or glRasterPos */
 424       /* emit all attribs (pos, color, texcoord) as GLfloat[4] */
 425       vinfo.num_attribs = st->state.vs->cso->state.num_outputs;
 426       for (i = 0; i < vinfo.num_attribs; i++) {
 427          vinfo.format[i] = FORMAT_4F;
 428          vinfo.interp_mode[i] = INTERP_LINEAR;
 429       }
 430    }
 431
 432    draw_set_vertex_info(st->draw, &vinfo);
 433 #endif
 434 }
 435
 436
 437 /**
 438  * Called by VBO to draw arrays when in selection or feedback mode and
 439  * to implement glRasterPos.
 440  * This is very much like the normal draw_vbo() function above.
 441  * Look at code refactoring some day.
 442  * Might move this into the failover module some day.
 443  */
 444 void
 445 st_feedback_draw_vbo(GLcontext *ctx,
 446                      const struct gl_client_array **arrays,
 447                      const struct _mesa_prim *prims,
 448                      GLuint nr_prims,
 449                      const struct _mesa_index_buffer *ib,
 450                      GLuint min_index,
 451                      GLuint max_index)
 452 {
 453    struct st_context *st = ctx->st;
 454    struct pipe_context *pipe = st->pipe;
 455    struct draw_context *draw = st->draw;
 456    const struct st_vertex_program *vp;
 457    const struct pipe_shader_state *vs;
 458    struct pipe_buffer *index_buffer_handle = 0;
 459    struct pipe_vertex_buffer vbuffers[PIPE_MAX_SHADER_INPUTS];
 460    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 461    GLuint attr, i;
 462    ubyte *mapped_constants;
 463
 464    assert(draw);
 465
 466    st_validate_state(ctx->st);
 467
 468    /* must get these after state validation! */
 469    vp = ctx->st->vp;
 470    vs = &st->vp->state;
 471
 472    if (!st->vp->draw_shader) {
 473       st->vp->draw_shader = draw_create_vertex_shader(draw, vs);
 474    }
 475
 476    /*
 477     * Set up the draw module's state.
 478     *
 479     * We'd like to do this less frequently, but the normal state-update
 480     * code sends state updates to the pipe, not to our private draw module.
 481     */
 482    assert(draw);
 483    draw_set_viewport_state(draw, &st->state.viewport);
 484    draw_set_clip_state(draw, &st->state.clip);
 485    draw_set_rasterizer_state(draw, &st->state.rasterizer);
 486    draw_bind_vertex_shader(draw, st->vp->draw_shader);
 487    set_feedback_vertex_format(ctx);
 488
 489    /* loop over TGSI shader inputs to determine vertex buffer
 490     * and attribute info
 491     */
 492    for (attr = 0; attr < vp->num_inputs; attr++) {
 493       const GLuint mesaAttr = vp->index_to_input[attr];
 494       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 495       void *map;
 496
 497       if (bufobj && bufobj->Name) {
 498          /* Attribute data is in a VBO.
 499           * Recall that for VBOs, the gl_client_array->Ptr field is
 500           * really an offset from the start of the VBO, not a pointer.
 501           */
 502          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 503          assert(stobj->buffer);
 504
 505          vbuffers[attr].buffer = NULL;
 506          pipe_reference_buffer(pipe, &vbuffers[attr].buffer, stobj->buffer);
 507          vbuffers[attr].buffer_offset = (unsigned) arrays[0]->Ptr;/* in bytes */
 508          velements[attr].src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
 509       }
 510       else {
 511          /* attribute data is in user-space memory, not a VBO */
 512          uint bytes = (arrays[mesaAttr]->Size
 513                        * _mesa_sizeof_type(arrays[mesaAttr]->Type)
 514                        * (max_index + 1));
 515
 516          /* wrap user data */
 517          vbuffers[attr].buffer
 518             = pipe_user_buffer_create(pipe, (void *) arrays[mesaAttr]->Ptr,
 519                                       bytes);
 520          vbuffers[attr].buffer_offset = 0;
 521          velements[attr].src_offset = 0;
 522       }
 523
 524       /* common-case setup */
 525       vbuffers[attr].pitch = arrays[mesaAttr]->StrideB; /* in bytes */
 526       vbuffers[attr].max_index = max_index;
 527       velements[attr].vertex_buffer_index = attr;
 528       velements[attr].nr_components = arrays[mesaAttr]->Size;
 529       velements[attr].src_format = pipe_vertex_format(arrays[mesaAttr]->Type,
 530                                                arrays[mesaAttr]->Size,
 531                                                arrays[mesaAttr]->Normalized);
 532       assert(velements[attr].src_format);
 533
 534       /* tell draw about this attribute */
 535 #if 0
 536       draw_set_vertex_buffer(draw, attr, &vbuffer[attr]);
 537 #endif
 538
 539       /* map the attrib buffer */
 540       map = pipe_buffer_map(pipe, vbuffers[attr].buffer,
 541                             PIPE_BUFFER_USAGE_CPU_READ);
 542       draw_set_mapped_vertex_buffer(draw, attr, map);
 543    }
 544
 545    draw_set_vertex_buffers(draw, vp->num_inputs, vbuffers);
 546    draw_set_vertex_elements(draw, vp->num_inputs, velements);
 547
 548    if (ib) {
 549       unsigned indexSize;
 550       struct gl_buffer_object *bufobj = ib->obj;
 551       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 552       void *map;
 553
 554       index_buffer_handle = stobj->buffer;
 555
 556       switch (ib->type) {
 557       case GL_UNSIGNED_INT:
 558          indexSize = 4;
 559          break;
 560       case GL_UNSIGNED_SHORT:
 561          indexSize = 2;
 562          break;
 563       default:
 564          assert(0);
 565          return;
 566       }
 567
 568       map = pipe_buffer_map(pipe, index_buffer_handle,
 569                             PIPE_BUFFER_USAGE_CPU_READ);
 570       draw_set_mapped_element_buffer(draw, indexSize, map);
 571    }
 572    else {
 573       /* no index/element buffer */
 574       draw_set_mapped_element_buffer(draw, 0, NULL);
 575    }
 576
 577
 578    /* map constant buffers */
 579    mapped_constants = pipe_buffer_map(pipe,
 580                                st->state.constants[PIPE_SHADER_VERTEX].buffer,
 581                                PIPE_BUFFER_USAGE_CPU_READ);
 582    draw_set_mapped_constant_buffer(st->draw, mapped_constants);
 583
 584
 585    /* draw here */
 586    for (i = 0; i < nr_prims; i++) {
 587       draw_arrays(draw, prims[i].mode, prims[i].start, prims[i].count);
 588    }
 589
 590
 591    /* unmap constant buffers */
 592    pipe_buffer_unmap(pipe, st->state.constants[PIPE_SHADER_VERTEX].buffer);
 593
 594    /*
 595     * unmap vertex/index buffers
 596     */
 597    for (i = 0; i < PIPE_MAX_ATTRIBS; i++) {
 598       if (draw->pt.vertex_buffer[i].buffer) {
 599          pipe_buffer_unmap(pipe, draw->pt.vertex_buffer[i].buffer);
 600          pipe_reference_buffer(pipe, &draw->pt.vertex_buffer[i].buffer, NULL);
 601          draw_set_mapped_vertex_buffer(draw, i, NULL);
 602       }
 603    }
 604    if (ib) {
 605       pipe_buffer_unmap(pipe, index_buffer_handle);
 606       draw_set_mapped_element_buffer(draw, 0, NULL);
 607    }
 608 }
 609
 610
 611
 612 void st_init_draw( struct st_context *st )
 613 {
 614    GLcontext *ctx = st->ctx;
 615
 616    vbo_set_draw_func(ctx, st_draw_vbo);
 617 }
 618
 619
 620 void st_destroy_draw( struct st_context *st )
 621 {
 622 }
 623
 624