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 static GLuint fixed_types[4] = {
 151    PIPE_FORMAT_R32_FIXED,
 152    PIPE_FORMAT_R32G32_FIXED,
 153    PIPE_FORMAT_R32G32B32_FIXED,
 154    PIPE_FORMAT_R32G32B32A32_FIXED
 155 };
 156
 157
 158
 159 /**
 160  * Return a PIPE_FORMAT_x for the given GL datatype and size.
 161  */
 162 static GLuint
 163 pipe_vertex_format(GLenum type, GLuint size, GLboolean normalized)
 164 {
 165    assert((type >= GL_BYTE && type <= GL_DOUBLE) ||
 166           type == GL_FIXED);
 167    assert(size >= 1);
 168    assert(size <= 4);
 169
 170    if (normalized) {
 171       switch (type) {
 172       case GL_DOUBLE: return double_types[size-1];
 173       case GL_FLOAT: return float_types[size-1];
 174       case GL_INT: return int_types_norm[size-1];
 175       case GL_SHORT: return short_types_norm[size-1];
 176       case GL_BYTE: return byte_types_norm[size-1];
 177       case GL_UNSIGNED_INT: return uint_types_norm[size-1];
 178       case GL_UNSIGNED_SHORT: return ushort_types_norm[size-1];
 179       case GL_UNSIGNED_BYTE: return ubyte_types_norm[size-1];
 180       case GL_FIXED: return fixed_types[size-1];
 181       default: assert(0); return 0;
 182       }
 183    }
 184    else {
 185       switch (type) {
 186       case GL_DOUBLE: return double_types[size-1];
 187       case GL_FLOAT: return float_types[size-1];
 188       case GL_INT: return int_types_scale[size-1];
 189       case GL_SHORT: return short_types_scale[size-1];
 190       case GL_BYTE: return byte_types_scale[size-1];
 191       case GL_UNSIGNED_INT: return uint_types_scale[size-1];
 192       case GL_UNSIGNED_SHORT: return ushort_types_scale[size-1];
 193       case GL_UNSIGNED_BYTE: return ubyte_types_scale[size-1];
 194       case GL_FIXED: return fixed_types[size-1];
 195       default: assert(0); return 0;
 196       }
 197    }
 198    return 0; /* silence compiler warning */
 199 }
 200
 201
 202 /*
 203  * If edge flags are needed, setup an bitvector of flags and call
 204  * pipe->set_edgeflags().
 205  * XXX memleak: need to free the returned pointer at some point
 206  */
 207 static void *
 208 setup_edgeflags(GLcontext *ctx, GLenum primMode, GLint start, GLint count,
 209                 const struct gl_client_array *array)
 210 {
 211    struct pipe_context *pipe = ctx->st->pipe;
 212
 213    if ((primMode == GL_TRIANGLES ||
 214         primMode == GL_QUADS ||
 215         primMode == GL_POLYGON) &&
 216        (ctx->Polygon.FrontMode != GL_FILL ||
 217         ctx->Polygon.BackMode != GL_FILL)) {
 218       /* need edge flags */
 219       GLint i;
 220       unsigned *vec;
 221       struct st_buffer_object *stobj = st_buffer_object(array->BufferObj);
 222       ubyte *map;
 223
 224       if (!stobj)
 225          return NULL;
 226
 227       vec = (unsigned *) calloc(sizeof(unsigned), (count + 31) / 32);
 228       if (!vec)
 229          return NULL;
 230
 231       map = pipe_buffer_map(pipe, stobj->buffer, PIPE_BUFFER_USAGE_CPU_READ);
 232       map = ADD_POINTERS(map, array->Ptr);
 233
 234       for (i = 0; i < count; i++) {
 235          if (*((float *) map))
 236             vec[i/32] |= 1 << (i % 32);
 237
 238          map += array->StrideB;
 239       }
 240
 241       pipe_buffer_unmap(pipe, stobj->buffer);
 242
 243       pipe->set_edgeflags(pipe, vec);
 244
 245       return vec;
 246    }
 247    else {
 248       /* edge flags not needed */
 249       pipe->set_edgeflags(pipe, NULL);
 250       return NULL;
 251    }
 252 }
 253
 254
 255
 256 /**
 257  * This function gets plugged into the VBO module and is called when
 258  * we have something to render.
 259  * Basically, translate the information into the format expected by pipe.
 260  */
 261 void
 262 st_draw_vbo(GLcontext *ctx,
 263             const struct gl_client_array **arrays,
 264             const struct _mesa_prim *prims,
 265             GLuint nr_prims,
 266             const struct _mesa_index_buffer *ib,
 267             GLuint min_index,
 268             GLuint max_index)
 269 {
 270    struct pipe_context *pipe = ctx->st->pipe;
 271    const struct st_vertex_program *vp;
 272    const struct pipe_shader_state *vs;
 273    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 274    GLuint attr;
 275    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 276
 277    /* sanity check for pointer arithmetic below */
 278    assert(sizeof(arrays[0]->Ptr[0]) == 1);
 279
 280    st_validate_state(ctx->st);
 281
 282    /* must get these after state validation! */
 283    vp = ctx->st->vp;
 284    vs = &ctx->st->vp->state;
 285
 286    /* loop over TGSI shader inputs to determine vertex buffer
 287     * and attribute info
 288     */
 289    for (attr = 0; attr < vp->num_inputs; attr++) {
 290       const GLuint mesaAttr = vp->index_to_input[attr];
 291       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 292
 293       if (bufobj && bufobj->Name) {
 294          /* Attribute data is in a VBO.
 295           * Recall that for VBOs, the gl_client_array->Ptr field is
 296           * really an offset from the start of the VBO, not a pointer.
 297           */
 298          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 299          assert(stobj->buffer);
 300
 301          vbuffer[attr].buffer = NULL;
 302          pipe_reference_buffer(pipe, &vbuffer[attr].buffer, stobj->buffer);
 303          vbuffer[attr].buffer_offset = (unsigned) arrays[0]->Ptr;/* in bytes */
 304          velements[attr].src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
 305          assert(velements[attr].src_offset <= 2048); /* 11-bit field */
 306       }
 307       else {
 308          /* attribute data is in user-space memory, not a VBO */
 309          uint bytes;
 310
 311          if (!arrays[mesaAttr]->StrideB) {
 312             bytes = arrays[mesaAttr]->Size
 313                     * _mesa_sizeof_type(arrays[mesaAttr]->Type);
 314          } else {
 315             bytes = arrays[mesaAttr]->StrideB * (max_index + 1);
 316          }
 317
 318          /* wrap user data */
 319          vbuffer[attr].buffer
 320             = pipe_user_buffer_create(pipe, (void *) arrays[mesaAttr]->Ptr,
 321                                       bytes);
 322          vbuffer[attr].buffer_offset = 0;
 323          velements[attr].src_offset = 0;
 324       }
 325
 326       /* common-case setup */
 327       vbuffer[attr].pitch = arrays[mesaAttr]->StrideB; /* in bytes */
 328       vbuffer[attr].max_index = max_index;
 329       velements[attr].vertex_buffer_index = attr;
 330       velements[attr].nr_components = arrays[mesaAttr]->Size;
 331       velements[attr].src_format
 332          = pipe_vertex_format(arrays[mesaAttr]->Type,
 333                               arrays[mesaAttr]->Size,
 334                               arrays[mesaAttr]->Normalized);
 335       assert(velements[attr].src_format);
 336    }
 337
 338    pipe->set_vertex_buffers(pipe, vp->num_inputs, vbuffer);
 339    pipe->set_vertex_elements(pipe, vp->num_inputs, velements);
 340
 341    /* do actual drawing */
 342    if (ib) {
 343       /* indexed primitive */
 344       struct gl_buffer_object *bufobj = ib->obj;
 345       struct pipe_buffer *indexBuf = NULL;
 346       unsigned indexSize, indexOffset, i;
 347
 348       switch (ib->type) {
 349       case GL_UNSIGNED_INT:
 350          indexSize = 4;
 351          break;
 352       case GL_UNSIGNED_SHORT:
 353          indexSize = 2;
 354          break;
 355       case GL_UNSIGNED_BYTE:
 356          indexSize = 1;
 357          break;
 358       default:
 359          assert(0);
 360          return;
 361       }
 362
 363       /* get/create the index buffer object */
 364       if (bufobj && bufobj->Name) {
 365          /* elements/indexes are in a real VBO */
 366          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 367          pipe_reference_buffer(pipe, &indexBuf, stobj->buffer);
 368          indexOffset = (unsigned) ib->ptr / indexSize;
 369       }
 370       else {
 371          /* element/indicies are in user space memory */
 372          indexBuf = pipe_user_buffer_create(pipe, (void *) ib->ptr,
 373                                             ib->count * indexSize);
 374          indexOffset = 0;
 375       }
 376
 377       /* draw */
 378       if (nr_prims == 1 && pipe->draw_range_elements != NULL) {
 379          i = 0;
 380
 381          /* XXX: exercise temporary path to pass min/max directly
 382           * through to driver & draw module.  These interfaces still
 383           * need a bit of work...
 384           */
 385          setup_edgeflags(ctx, prims[i].mode,
 386                          prims[i].start + indexOffset, prims[i].count,
 387                          arrays[VERT_ATTRIB_EDGEFLAG]);
 388
 389          pipe->draw_range_elements(pipe, indexBuf, indexSize,
 390                                    min_index,
 391                                    max_index,
 392                                    prims[i].mode,
 393                                    prims[i].start + indexOffset, prims[i].count);
 394       }
 395       else {
 396          for (i = 0; i < nr_prims; i++) {
 397             setup_edgeflags(ctx, prims[i].mode,
 398                             prims[i].start + indexOffset, prims[i].count,
 399                             arrays[VERT_ATTRIB_EDGEFLAG]);
 400
 401             pipe->draw_elements(pipe, indexBuf, indexSize,
 402                                 prims[i].mode,
 403                                 prims[i].start + indexOffset, prims[i].count);
 404          }
 405       }
 406
 407       pipe_reference_buffer(pipe, &indexBuf, NULL);
 408    }
 409    else {
 410       /* non-indexed */
 411       GLuint i;
 412       for (i = 0; i < nr_prims; i++) {
 413          setup_edgeflags(ctx, prims[i].mode,
 414                          prims[i].start, prims[i].count,
 415                          arrays[VERT_ATTRIB_EDGEFLAG]);
 416
 417          pipe->draw_arrays(pipe, prims[i].mode, prims[i].start, prims[i].count);
 418       }
 419    }
 420
 421    /* unreference buffers (frees wrapped user-space buffer objects) */
 422    for (attr = 0; attr < vp->num_inputs; attr++) {
 423       pipe_reference_buffer(pipe, &vbuffer[attr].buffer, NULL);
 424       assert(!vbuffer[attr].buffer);
 425    }
 426    pipe->set_vertex_buffers(pipe, vp->num_inputs, vbuffer);
 427 }
 428
 429
 430
 431 /**
 432  * Set the (private) draw module's post-transformed vertex format when in
 433  * GL_SELECT or GL_FEEDBACK mode or for glRasterPos.
 434  */
 435 static void
 436 set_feedback_vertex_format(GLcontext *ctx)
 437 {
 438 #if 0
 439    struct st_context *st = ctx->st;
 440    struct vertex_info vinfo;
 441    GLuint i;
 442
 443    memset(&vinfo, 0, sizeof(vinfo));
 444
 445    if (ctx->RenderMode == GL_SELECT) {
 446       assert(ctx->RenderMode == GL_SELECT);
 447       vinfo.num_attribs = 1;
 448       vinfo.format[0] = FORMAT_4F;
 449       vinfo.interp_mode[0] = INTERP_LINEAR;
 450    }
 451    else {
 452       /* GL_FEEDBACK, or glRasterPos */
 453       /* emit all attribs (pos, color, texcoord) as GLfloat[4] */
 454       vinfo.num_attribs = st->state.vs->cso->state.num_outputs;
 455       for (i = 0; i < vinfo.num_attribs; i++) {
 456          vinfo.format[i] = FORMAT_4F;
 457          vinfo.interp_mode[i] = INTERP_LINEAR;
 458       }
 459    }
 460
 461    draw_set_vertex_info(st->draw, &vinfo);
 462 #endif
 463 }
 464
 465
 466 /**
 467  * Called by VBO to draw arrays when in selection or feedback mode and
 468  * to implement glRasterPos.
 469  * This is very much like the normal draw_vbo() function above.
 470  * Look at code refactoring some day.
 471  * Might move this into the failover module some day.
 472  */
 473 void
 474 st_feedback_draw_vbo(GLcontext *ctx,
 475                      const struct gl_client_array **arrays,
 476                      const struct _mesa_prim *prims,
 477                      GLuint nr_prims,
 478                      const struct _mesa_index_buffer *ib,
 479                      GLuint min_index,
 480                      GLuint max_index)
 481 {
 482    struct st_context *st = ctx->st;
 483    struct pipe_context *pipe = st->pipe;
 484    struct draw_context *draw = st->draw;
 485    const struct st_vertex_program *vp;
 486    const struct pipe_shader_state *vs;
 487    struct pipe_buffer *index_buffer_handle = 0;
 488    struct pipe_vertex_buffer vbuffers[PIPE_MAX_SHADER_INPUTS];
 489    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 490    GLuint attr, i;
 491    ubyte *mapped_constants;
 492
 493    assert(draw);
 494
 495    st_validate_state(ctx->st);
 496
 497    /* must get these after state validation! */
 498    vp = ctx->st->vp;
 499    vs = &st->vp->state;
 500
 501    if (!st->vp->draw_shader) {
 502       st->vp->draw_shader = draw_create_vertex_shader(draw, vs);
 503    }
 504
 505    /*
 506     * Set up the draw module's state.
 507     *
 508     * We'd like to do this less frequently, but the normal state-update
 509     * code sends state updates to the pipe, not to our private draw module.
 510     */
 511    assert(draw);
 512    draw_set_viewport_state(draw, &st->state.viewport);
 513    draw_set_clip_state(draw, &st->state.clip);
 514    draw_set_rasterizer_state(draw, &st->state.rasterizer);
 515    draw_bind_vertex_shader(draw, st->vp->draw_shader);
 516    set_feedback_vertex_format(ctx);
 517
 518    /* loop over TGSI shader inputs to determine vertex buffer
 519     * and attribute info
 520     */
 521    for (attr = 0; attr < vp->num_inputs; attr++) {
 522       const GLuint mesaAttr = vp->index_to_input[attr];
 523       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 524       void *map;
 525
 526       if (bufobj && bufobj->Name) {
 527          /* Attribute data is in a VBO.
 528           * Recall that for VBOs, the gl_client_array->Ptr field is
 529           * really an offset from the start of the VBO, not a pointer.
 530           */
 531          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 532          assert(stobj->buffer);
 533
 534          vbuffers[attr].buffer = NULL;
 535          pipe_reference_buffer(pipe, &vbuffers[attr].buffer, stobj->buffer);
 536          vbuffers[attr].buffer_offset = (unsigned) arrays[0]->Ptr;/* in bytes */
 537          velements[attr].src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
 538       }
 539       else {
 540          /* attribute data is in user-space memory, not a VBO */
 541          uint bytes = (arrays[mesaAttr]->Size
 542                        * _mesa_sizeof_type(arrays[mesaAttr]->Type)
 543                        * (max_index + 1));
 544
 545          /* wrap user data */
 546          vbuffers[attr].buffer
 547             = pipe_user_buffer_create(pipe, (void *) arrays[mesaAttr]->Ptr,
 548                                       bytes);
 549          vbuffers[attr].buffer_offset = 0;
 550          velements[attr].src_offset = 0;
 551       }
 552
 553       /* common-case setup */
 554       vbuffers[attr].pitch = arrays[mesaAttr]->StrideB; /* in bytes */
 555       vbuffers[attr].max_index = max_index;
 556       velements[attr].vertex_buffer_index = attr;
 557       velements[attr].nr_components = arrays[mesaAttr]->Size;
 558       velements[attr].src_format = pipe_vertex_format(arrays[mesaAttr]->Type,
 559                                                arrays[mesaAttr]->Size,
 560                                                arrays[mesaAttr]->Normalized);
 561       assert(velements[attr].src_format);
 562
 563       /* tell draw about this attribute */
 564 #if 0
 565       draw_set_vertex_buffer(draw, attr, &vbuffer[attr]);
 566 #endif
 567
 568       /* map the attrib buffer */
 569       map = pipe_buffer_map(pipe, vbuffers[attr].buffer,
 570                             PIPE_BUFFER_USAGE_CPU_READ);
 571       draw_set_mapped_vertex_buffer(draw, attr, map);
 572    }
 573
 574    draw_set_vertex_buffers(draw, vp->num_inputs, vbuffers);
 575    draw_set_vertex_elements(draw, vp->num_inputs, velements);
 576
 577    if (ib) {
 578       unsigned indexSize;
 579       struct gl_buffer_object *bufobj = ib->obj;
 580       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 581       void *map;
 582
 583       index_buffer_handle = stobj->buffer;
 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       default:
 593          assert(0);
 594          return;
 595       }
 596
 597       map = pipe_buffer_map(pipe, index_buffer_handle,
 598                             PIPE_BUFFER_USAGE_CPU_READ);
 599       draw_set_mapped_element_buffer(draw, indexSize, map);
 600    }
 601    else {
 602       /* no index/element buffer */
 603       draw_set_mapped_element_buffer(draw, 0, NULL);
 604    }
 605
 606
 607    /* map constant buffers */
 608    mapped_constants = pipe_buffer_map(pipe,
 609                                       st->state.constants[PIPE_SHADER_VERTEX].buffer,
 610                                       PIPE_BUFFER_USAGE_CPU_READ);
 611    draw_set_mapped_constant_buffer(st->draw, mapped_constants,
 612                                    st->state.constants[PIPE_SHADER_VERTEX].buffer->size);
 613
 614
 615    /* draw here */
 616    for (i = 0; i < nr_prims; i++) {
 617       draw_arrays(draw, prims[i].mode, prims[i].start, prims[i].count);
 618    }
 619
 620
 621    /* unmap constant buffers */
 622    pipe_buffer_unmap(pipe, st->state.constants[PIPE_SHADER_VERTEX].buffer);
 623
 624    /*
 625     * unmap vertex/index buffers
 626     */
 627    for (i = 0; i < PIPE_MAX_ATTRIBS; i++) {
 628       if (draw->pt.vertex_buffer[i].buffer) {
 629          pipe_buffer_unmap(pipe, draw->pt.vertex_buffer[i].buffer);
 630          pipe_reference_buffer(pipe, &draw->pt.vertex_buffer[i].buffer, NULL);
 631          draw_set_mapped_vertex_buffer(draw, i, NULL);
 632       }
 633    }
 634    if (ib) {
 635       pipe_buffer_unmap(pipe, index_buffer_handle);
 636       draw_set_mapped_element_buffer(draw, 0, NULL);
 637    }
 638 }
 639
 640
 641
 642 void st_init_draw( struct st_context *st )
 643 {
 644    GLcontext *ctx = st->ctx;
 645
 646    vbo_set_draw_func(ctx, st_draw_vbo);
 647 }
 648
 649
 650 void st_destroy_draw( struct st_context *st )
 651 {
 652 }
 653
 654