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_atom.h"
  39 #include "st_cache.h"
  40 #include "st_context.h"
  41 #include "st_cb_bufferobjects.h"
  42 #include "st_draw.h"
  43 #include "st_program.h"
  44
  45 #include "pipe/p_context.h"
  46 #include "pipe/p_defines.h"
  47 #include "pipe/p_winsys.h"
  48
  49 #include "pipe/draw/draw_private.h"
  50 #include "pipe/draw/draw_context.h"
  51
  52
  53 static GLuint double_types[4] = {
  54    PIPE_FORMAT_R64_FLOAT,
  55    PIPE_FORMAT_R64G64_FLOAT,
  56    PIPE_FORMAT_R64G64B64_FLOAT,
  57    PIPE_FORMAT_R64G64B64A64_FLOAT
  58 };
  59
  60 static GLuint float_types[4] = {
  61    PIPE_FORMAT_R32_FLOAT,
  62    PIPE_FORMAT_R32G32_FLOAT,
  63    PIPE_FORMAT_R32G32B32_FLOAT,
  64    PIPE_FORMAT_R32G32B32A32_FLOAT
  65 };
  66
  67 static GLuint uint_types_norm[4] = {
  68    PIPE_FORMAT_R32_UNORM,
  69    PIPE_FORMAT_R32G32_UNORM,
  70    PIPE_FORMAT_R32G32B32_UNORM,
  71    PIPE_FORMAT_R32G32B32A32_UNORM
  72 };
  73
  74 static GLuint uint_types_scale[4] = {
  75    PIPE_FORMAT_R32_USCALED,
  76    PIPE_FORMAT_R32G32_USCALED,
  77    PIPE_FORMAT_R32G32B32_USCALED,
  78    PIPE_FORMAT_R32G32B32A32_USCALED
  79 };
  80
  81 static GLuint int_types_norm[4] = {
  82    PIPE_FORMAT_R32_SNORM,
  83    PIPE_FORMAT_R32G32_SNORM,
  84    PIPE_FORMAT_R32G32B32_SNORM,
  85    PIPE_FORMAT_R32G32B32A32_SNORM
  86 };
  87
  88 static GLuint int_types_scale[4] = {
  89    PIPE_FORMAT_R32_SSCALED,
  90    PIPE_FORMAT_R32G32_SSCALED,
  91    PIPE_FORMAT_R32G32B32_SSCALED,
  92    PIPE_FORMAT_R32G32B32A32_SSCALED
  93 };
  94
  95 static GLuint ushort_types_norm[4] = {
  96    PIPE_FORMAT_R16_UNORM,
  97    PIPE_FORMAT_R16G16_UNORM,
  98    PIPE_FORMAT_R16G16B16_UNORM,
  99    PIPE_FORMAT_R16G16B16A16_UNORM
 100 };
 101
 102 static GLuint ushort_types_scale[4] = {
 103    PIPE_FORMAT_R16_USCALED,
 104    PIPE_FORMAT_R16G16_USCALED,
 105    PIPE_FORMAT_R16G16B16_USCALED,
 106    PIPE_FORMAT_R16G16B16A16_USCALED
 107 };
 108
 109 static GLuint short_types_norm[4] = {
 110    PIPE_FORMAT_R16_SNORM,
 111    PIPE_FORMAT_R16G16_SNORM,
 112    PIPE_FORMAT_R16G16B16_SNORM,
 113    PIPE_FORMAT_R16G16B16A16_SNORM
 114 };
 115
 116 static GLuint short_types_scale[4] = {
 117    PIPE_FORMAT_R16_SSCALED,
 118    PIPE_FORMAT_R16G16_SSCALED,
 119    PIPE_FORMAT_R16G16B16_SSCALED,
 120    PIPE_FORMAT_R16G16B16A16_SSCALED
 121 };
 122
 123 static GLuint ubyte_types_norm[4] = {
 124    PIPE_FORMAT_R8_UNORM,
 125    PIPE_FORMAT_R8G8_UNORM,
 126    PIPE_FORMAT_R8G8B8_UNORM,
 127    PIPE_FORMAT_R8G8B8A8_UNORM
 128 };
 129
 130 static GLuint ubyte_types_scale[4] = {
 131    PIPE_FORMAT_R8_USCALED,
 132    PIPE_FORMAT_R8G8_USCALED,
 133    PIPE_FORMAT_R8G8B8_USCALED,
 134    PIPE_FORMAT_R8G8B8A8_USCALED
 135 };
 136
 137 static GLuint byte_types_norm[4] = {
 138    PIPE_FORMAT_R8_SNORM,
 139    PIPE_FORMAT_R8G8_SNORM,
 140    PIPE_FORMAT_R8G8B8_SNORM,
 141    PIPE_FORMAT_R8G8B8A8_SNORM
 142 };
 143
 144 static GLuint byte_types_scale[4] = {
 145    PIPE_FORMAT_R8_SSCALED,
 146    PIPE_FORMAT_R8G8_SSCALED,
 147    PIPE_FORMAT_R8G8B8_SSCALED,
 148    PIPE_FORMAT_R8G8B8A8_SSCALED
 149 };
 150
 151
 152 /**
 153  * Return a PIPE_FORMAT_x for the given GL datatype and size.
 154  */
 155 static GLuint
 156 pipe_vertex_format(GLenum type, GLuint size, GLboolean normalized)
 157 {
 158    assert(type >= GL_BYTE);
 159    assert(type <= GL_DOUBLE);
 160    assert(size >= 1);
 161    assert(size <= 4);
 162
 163    if (normalized) {
 164       switch (type) {
 165       case GL_DOUBLE: return double_types[size-1];
 166       case GL_FLOAT: return float_types[size-1];
 167       case GL_INT: return int_types_norm[size-1];
 168       case GL_SHORT: return short_types_norm[size-1];
 169       case GL_BYTE: return byte_types_norm[size-1];
 170       case GL_UNSIGNED_INT: return uint_types_norm[size-1];
 171       case GL_UNSIGNED_SHORT: return ushort_types_norm[size-1];
 172       case GL_UNSIGNED_BYTE: return ubyte_types_norm[size-1];
 173       default: assert(0); return 0;
 174       }
 175    }
 176    else {
 177       switch (type) {
 178       case GL_DOUBLE: return double_types[size-1];
 179       case GL_FLOAT: return float_types[size-1];
 180       case GL_INT: return int_types_scale[size-1];
 181       case GL_SHORT: return short_types_scale[size-1];
 182       case GL_BYTE: return byte_types_scale[size-1];
 183       case GL_UNSIGNED_INT: return uint_types_scale[size-1];
 184       case GL_UNSIGNED_SHORT: return ushort_types_scale[size-1];
 185       case GL_UNSIGNED_BYTE: return ubyte_types_scale[size-1];
 186       default: assert(0); return 0;
 187       }
 188    }
 189    return 0; /* silence compiler warning */
 190 }
 191
 192
 193 /**
 194  * The default attribute buffer is basically a copy of the
 195  * ctx->Current.Attrib[] array.  It's used when the vertex program
 196  * references an attribute for which we don't have a VBO/array.
 197  */
 198 static void
 199 create_default_attribs_buffer(struct st_context *st)
 200 {
 201    struct pipe_context *pipe = st->pipe;
 202    st->default_attrib_buffer = pipe->winsys->buffer_create( pipe->winsys, 32, 0, 0 );
 203 }
 204
 205
 206 static void
 207 destroy_default_attribs_buffer(struct st_context *st)
 208 {
 209    struct pipe_context *pipe = st->pipe;
 210    pipe->winsys->buffer_reference(pipe->winsys,
 211                                   &st->default_attrib_buffer, NULL);
 212 }
 213
 214
 215 /**
 216  * This function gets plugged into the VBO module and is called when
 217  * we have something to render.
 218  * Basically, translate the information into the format expected by pipe.
 219  */
 220 void
 221 st_draw_vbo(GLcontext *ctx,
 222             const struct gl_client_array **arrays,
 223             const struct _mesa_prim *prims,
 224             GLuint nr_prims,
 225             const struct _mesa_index_buffer *ib,
 226             GLuint min_index,
 227             GLuint max_index)
 228 {
 229    struct pipe_context *pipe = ctx->st->pipe;
 230    struct pipe_winsys *winsys = pipe->winsys;
 231    const struct st_vertex_program *vp;
 232    const struct pipe_shader_state *vs;
 233    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 234    GLuint attr;
 235
 236    /* sanity check for pointer arithmetic below */
 237    assert(sizeof(arrays[0]->Ptr[0]) == 1);
 238
 239    st_validate_state(ctx->st);
 240
 241    /* must get these after state validation! */
 242    vp = ctx->st->vp;
 243    vs = &ctx->st->state.vs->state;
 244
 245    /* loop over TGSI shader inputs to determine vertex buffer
 246     * and attribute info
 247     */
 248    for (attr = 0; attr < vs->num_inputs; attr++) {
 249       const GLuint mesaAttr = vp->index_to_input[attr];
 250       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 251       struct pipe_vertex_element velement;
 252
 253       if (bufobj && bufobj->Name) {
 254          /* Attribute data is in a VBO.
 255           * Recall that for VBOs, the gl_client_array->Ptr field is
 256           * really an offset from the start of the VBO, not a pointer.
 257           */
 258          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 259          assert(stobj->buffer);
 260
 261          vbuffer[attr].buffer = NULL;
 262          winsys->buffer_reference(winsys, &vbuffer[attr].buffer, stobj->buffer);
 263          vbuffer[attr].buffer_offset = (unsigned) arrays[0]->Ptr;/* in bytes */
 264          velement.src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
 265          assert(velement.src_offset <= 2048); /* 11-bit field */
 266       }
 267       else {
 268          /* attribute data is in user-space memory, not a VBO */
 269          uint bytes;
 270
 271          if (!arrays[mesaAttr]->StrideB) {
 272             bytes = arrays[mesaAttr]->Size
 273                     * _mesa_sizeof_type(arrays[mesaAttr]->Type);
 274          } else {
 275             bytes = arrays[mesaAttr]->StrideB * (max_index + 1);
 276          }
 277
 278          /* wrap user data */
 279          vbuffer[attr].buffer
 280             = winsys->user_buffer_create(winsys,
 281                                          (void *) arrays[mesaAttr]->Ptr,
 282                                          bytes);
 283          vbuffer[attr].buffer_offset = 0;
 284          velement.src_offset = 0;
 285       }
 286
 287       /* common-case setup */
 288       vbuffer[attr].pitch = arrays[mesaAttr]->StrideB; /* in bytes */
 289       vbuffer[attr].max_index = 0;  /* need this? */
 290       velement.vertex_buffer_index = attr;
 291       velement.dst_offset = 0; /* need this? */
 292       velement.src_format = pipe_vertex_format(arrays[mesaAttr]->Type,
 293                                                arrays[mesaAttr]->Size,
 294                                                arrays[mesaAttr]->Normalized);
 295       assert(velement.src_format);
 296
 297       /* tell pipe about this attribute */
 298       pipe->set_vertex_buffer(pipe, attr, &vbuffer[attr]);
 299       pipe->set_vertex_element(pipe, attr, &velement);
 300    }
 301
 302
 303    /* do actual drawing */
 304    if (ib) {
 305       /* indexed primitive */
 306       struct gl_buffer_object *bufobj = ib->obj;
 307       struct pipe_buffer_handle *indexBuf = NULL;
 308       unsigned indexSize, indexOffset, i;
 309
 310       switch (ib->type) {
 311       case GL_UNSIGNED_INT:
 312          indexSize = 4;
 313          break;
 314       case GL_UNSIGNED_SHORT:
 315          indexSize = 2;
 316          break;
 317       case GL_UNSIGNED_BYTE:
 318          indexSize = 1;
 319          break;
 320       default:
 321          assert(0);
 322       }
 323
 324       /* get/create the index buffer object */
 325       if (bufobj && bufobj->Name) {
 326          /* elements/indexes are in a real VBO */
 327          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 328          winsys->buffer_reference(winsys, &indexBuf, stobj->buffer);
 329          indexOffset = (unsigned) ib->ptr / indexSize;
 330       }
 331       else {
 332          /* element/indicies are in user space memory */
 333          indexBuf = winsys->user_buffer_create(winsys,
 334                                                (void *) ib->ptr,
 335                                                ib->count * indexSize);
 336          indexOffset = 0;
 337       }
 338
 339       /* draw */
 340       for (i = 0; i < nr_prims; i++) {
 341          pipe->draw_elements(pipe, indexBuf, indexSize,
 342                              prims[i].mode,
 343                              prims[i].start + indexOffset, prims[i].count);
 344       }
 345
 346       winsys->buffer_reference(winsys, &indexBuf, NULL);
 347    }
 348    else {
 349       /* non-indexed */
 350       GLuint i;
 351       for (i = 0; i < nr_prims; i++) {
 352          pipe->draw_arrays(pipe, prims[i].mode, prims[i].start, prims[i].count);
 353       }
 354    }
 355
 356    /* unreference buffers (frees wrapped user-space buffer objects) */
 357    for (attr = 0; attr < vs->num_inputs; attr++) {
 358       winsys->buffer_reference(winsys, &vbuffer[attr].buffer, NULL);
 359       assert(!vbuffer[attr].buffer);
 360       pipe->set_vertex_buffer(pipe, attr, &vbuffer[attr]);
 361    }
 362 }
 363
 364
 365
 366 /**
 367  * Utility function for drawing simple primitives (such as quads for
 368  * glClear and glDrawPixels).  Coordinates are in screen space.
 369  * \param mode  one of PIPE_PRIM_x
 370  * \param numVertex  number of vertices
 371  * \param verts  vertex data (all attributes are float[4])
 372  * \param numAttribs  number of attributes per vertex
 373  */
 374 void
 375 st_draw_vertices(GLcontext *ctx, unsigned prim,
 376                  unsigned numVertex, float *verts,
 377                  unsigned numAttribs)
 378 {
 379    const float width = ctx->DrawBuffer->Width;
 380    const float height = ctx->DrawBuffer->Height;
 381    const unsigned vertex_bytes = numVertex * numAttribs * 4 * sizeof(float);
 382    struct pipe_context *pipe = ctx->st->pipe;
 383    struct pipe_buffer_handle *vbuf;
 384    struct pipe_vertex_buffer vbuffer;
 385    struct pipe_vertex_element velement;
 386    unsigned i;
 387
 388    assert(numAttribs > 0);
 389
 390    /* convert to clip coords */
 391    for (i = 0; i < numVertex; i++) {
 392       float x = verts[i * numAttribs * 4 + 0];
 393       float y = verts[i * numAttribs * 4 + 1];
 394       x = x / width * 2.0 - 1.0;
 395       y = y / height * 2.0 - 1.0;
 396       verts[i * numAttribs * 4 + 0] = x;
 397       verts[i * numAttribs * 4 + 1] = y;
 398    }
 399
 400    /* XXX create one-time */
 401    vbuf = pipe->winsys->buffer_create(pipe->winsys, 32, 0, 0);
 402    pipe->winsys->buffer_data(pipe->winsys, vbuf,
 403                              vertex_bytes, verts,
 404                              PIPE_BUFFER_USAGE_VERTEX);
 405
 406    /* tell pipe about the vertex buffer */
 407    vbuffer.buffer = vbuf;
 408    vbuffer.pitch = numAttribs * 4 * sizeof(float);  /* vertex size */
 409    vbuffer.buffer_offset = 0;
 410    pipe->set_vertex_buffer(pipe, 0, &vbuffer);
 411
 412    /* tell pipe about the vertex attributes */
 413    for (i = 0; i < numAttribs; i++) {
 414       velement.src_offset = i * 4 * sizeof(GLfloat);
 415       velement.vertex_buffer_index = 0;
 416       velement.src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 417       velement.dst_offset = 0;
 418       pipe->set_vertex_element(pipe, i, &velement);
 419    }
 420
 421    /* draw */
 422    pipe->draw_arrays(pipe, prim, 0, numVertex);
 423
 424    /* XXX: do one-time */
 425    pipe->winsys->buffer_reference(pipe->winsys, &vbuf, NULL);
 426 }
 427
 428
 429 /**
 430  * Set the (private) draw module's post-transformed vertex format when in
 431  * GL_SELECT or GL_FEEDBACK mode or for glRasterPos.
 432  */
 433 static void
 434 set_feedback_vertex_format(GLcontext *ctx)
 435 {
 436    struct st_context *st = ctx->st;
 437    struct vertex_info vinfo;
 438    GLuint i;
 439
 440    if (ctx->RenderMode == GL_SELECT) {
 441       assert(ctx->RenderMode == GL_SELECT);
 442       vinfo.num_attribs = 1;
 443       vinfo.format[0] = FORMAT_4F;
 444       vinfo.interp_mode[0] = INTERP_NONE;
 445    }
 446    else {
 447       /* GL_FEEDBACK, or glRasterPos */
 448       /* emit all attribs (pos, color, texcoord) as GLfloat[4] */
 449       vinfo.num_attribs = st->state.vs->state.num_outputs;
 450       for (i = 0; i < vinfo.num_attribs; i++) {
 451          vinfo.format[i] = FORMAT_4F;
 452          vinfo.interp_mode[i] = INTERP_LINEAR;
 453       }
 454    }
 455
 456    draw_set_vertex_info(st->draw, &vinfo);
 457 }
 458
 459
 460 /**
 461  * Called by VBO to draw arrays when in selection or feedback mode and
 462  * to implement glRasterPos.
 463  * This is very much like the normal draw_vbo() function above.
 464  * Look at code refactoring some day.
 465  * Might move this into the failover module some day.
 466  */
 467 void
 468 st_feedback_draw_vbo(GLcontext *ctx,
 469                      const struct gl_client_array **arrays,
 470                      const struct _mesa_prim *prims,
 471                      GLuint nr_prims,
 472                      const struct _mesa_index_buffer *ib,
 473                      GLuint min_index,
 474                      GLuint max_index)
 475 {
 476    struct st_context *st = ctx->st;
 477    struct pipe_context *pipe = st->pipe;
 478    struct draw_context *draw = st->draw;
 479    struct pipe_winsys *winsys = pipe->winsys;
 480    const struct st_vertex_program *vp;
 481    const struct pipe_shader_state *vs;
 482    struct pipe_buffer_handle *index_buffer_handle = 0;
 483    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 484    GLuint attr, i;
 485    ubyte *mapped_constants;
 486
 487    assert(draw);
 488
 489    st_validate_state(ctx->st);
 490
 491    /* must get these after state validation! */
 492    vp = ctx->st->vp;
 493    vs = &ctx->st->state.vs->state;
 494
 495    /*
 496     * Set up the draw module's state.
 497     *
 498     * We'd like to do this less frequently, but the normal state-update
 499     * code sends state updates to the pipe, not to our private draw module.
 500     */
 501    assert(draw);
 502    draw_set_viewport_state(draw, &st->state.viewport);
 503    draw_set_clip_state(draw, &st->state.clip);
 504    draw_set_rasterizer_state(draw, &st->state.rasterizer->state);
 505    draw_bind_vertex_shader(draw, st->state.vs->data);
 506    set_feedback_vertex_format(ctx);
 507
 508    /* loop over TGSI shader inputs to determine vertex buffer
 509     * and attribute info
 510     */
 511    for (attr = 0; attr < vs->num_inputs; attr++) {
 512       const GLuint mesaAttr = vp->index_to_input[attr];
 513       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 514       struct pipe_vertex_element velement;
 515       void *map;
 516
 517       if (bufobj && bufobj->Name) {
 518          /* Attribute data is in a VBO.
 519           * Recall that for VBOs, the gl_client_array->Ptr field is
 520           * really an offset from the start of the VBO, not a pointer.
 521           */
 522          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 523          assert(stobj->buffer);
 524
 525          vbuffer[attr].buffer = NULL;
 526          winsys->buffer_reference(winsys, &vbuffer[attr].buffer, stobj->buffer);
 527          vbuffer[attr].buffer_offset = (unsigned) arrays[0]->Ptr;/* in bytes */
 528          velement.src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
 529       }
 530       else {
 531          /* attribute data is in user-space memory, not a VBO */
 532          uint bytes = (arrays[mesaAttr]->Size
 533                        * _mesa_sizeof_type(arrays[mesaAttr]->Type)
 534                        * (max_index + 1));
 535
 536          /* wrap user data */
 537          vbuffer[attr].buffer
 538             = winsys->user_buffer_create(winsys,
 539                                          (void *) arrays[mesaAttr]->Ptr,
 540                                          bytes);
 541          vbuffer[attr].buffer_offset = 0;
 542          velement.src_offset = 0;
 543       }
 544
 545       /* common-case setup */
 546       vbuffer[attr].pitch = arrays[mesaAttr]->StrideB; /* in bytes */
 547       vbuffer[attr].max_index = 0;  /* need this? */
 548       velement.vertex_buffer_index = attr;
 549       velement.dst_offset = 0; /* need this? */
 550       velement.src_format = pipe_vertex_format(arrays[mesaAttr]->Type,
 551                                                arrays[mesaAttr]->Size,
 552                                                arrays[mesaAttr]->Normalized);
 553       assert(velement.src_format);
 554
 555       /* tell draw about this attribute */
 556       draw_set_vertex_buffer(draw, attr, &vbuffer[attr]);
 557       draw_set_vertex_element(draw, attr, &velement);
 558
 559       /* map the attrib buffer */
 560       map = pipe->winsys->buffer_map(pipe->winsys,
 561                                      vbuffer[attr].buffer,
 562                                      PIPE_BUFFER_FLAG_READ);
 563       draw_set_mapped_vertex_buffer(draw, attr, map);
 564    }
 565
 566    if (ib) {
 567       unsigned indexSize;
 568       struct gl_buffer_object *bufobj = ib->obj;
 569       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 570       index_buffer_handle = stobj->buffer;
 571       void *map;
 572
 573       switch (ib->type) {
 574       case GL_UNSIGNED_INT:
 575          indexSize = 4;
 576          break;
 577       case GL_UNSIGNED_SHORT:
 578          indexSize = 2;
 579          break;
 580       default:
 581          assert(0);
 582       }
 583
 584       map = pipe->winsys->buffer_map(pipe->winsys,
 585                                      index_buffer_handle,
 586                                      PIPE_BUFFER_FLAG_READ);
 587       draw_set_mapped_element_buffer(draw, indexSize, map);
 588    }
 589    else {
 590       /* no index/element buffer */
 591       draw_set_mapped_element_buffer(draw, 0, NULL);
 592    }
 593
 594
 595    /* map constant buffers */
 596    mapped_constants = winsys->buffer_map(winsys,
 597                                st->state.constants[PIPE_SHADER_VERTEX].buffer,
 598                                PIPE_BUFFER_FLAG_READ);
 599    draw_set_mapped_constant_buffer(st->draw, mapped_constants);
 600
 601
 602    /* draw here */
 603    for (i = 0; i < nr_prims; i++) {
 604       draw_arrays(draw, prims[i].mode, prims[i].start, prims[i].count);
 605    }
 606
 607
 608    /* unmap constant buffers */
 609    winsys->buffer_unmap(winsys, st->state.constants[PIPE_SHADER_VERTEX].buffer);
 610
 611    /*
 612     * unmap vertex/index buffers
 613     */
 614    for (i = 0; i < PIPE_ATTRIB_MAX; i++) {
 615       if (draw->vertex_buffer[i].buffer) {
 616          pipe->winsys->buffer_unmap(pipe->winsys,
 617                                     draw->vertex_buffer[i].buffer);
 618          draw_set_mapped_vertex_buffer(draw, i, NULL);
 619       }
 620    }
 621    if (ib) {
 622       pipe->winsys->buffer_unmap(pipe->winsys, index_buffer_handle);
 623       draw_set_mapped_element_buffer(draw, 0, NULL);
 624    }
 625 }
 626
 627
 628
 629 void st_init_draw( struct st_context *st )
 630 {
 631    GLcontext *ctx = st->ctx;
 632
 633    /* actually, not used here, but elsewhere */
 634    create_default_attribs_buffer(st);
 635
 636    vbo_set_draw_func(ctx, st_draw_vbo);
 637 }
 638
 639
 640 void st_destroy_draw( struct st_context *st )
 641 {
 642    destroy_default_attribs_buffer(st);
 643 }
 644
 645