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    /* XXX don't hardcode magic 32 here */
 203    st->default_attrib_buffer = pipe->winsys->buffer_create( pipe->winsys, 32, 0, 0 );
 204 }
 205
 206
 207 static void
 208 destroy_default_attribs_buffer(struct st_context *st)
 209 {
 210    struct pipe_context *pipe = st->pipe;
 211    pipe->winsys->buffer_reference(pipe->winsys,
 212                                   &st->default_attrib_buffer, NULL);
 213 }
 214
 215
 216 /**
 217  * This function gets plugged into the VBO module and is called when
 218  * we have something to render.
 219  * Basically, translate the information into the format expected by pipe.
 220  */
 221 void
 222 st_draw_vbo(GLcontext *ctx,
 223             const struct gl_client_array **arrays,
 224             const struct _mesa_prim *prims,
 225             GLuint nr_prims,
 226             const struct _mesa_index_buffer *ib,
 227             GLuint min_index,
 228             GLuint max_index)
 229 {
 230    struct pipe_context *pipe = ctx->st->pipe;
 231    struct pipe_winsys *winsys = pipe->winsys;
 232    const struct st_vertex_program *vp;
 233    const struct pipe_shader_state *vs;
 234    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 235    GLuint attr;
 236
 237    /* sanity check for pointer arithmetic below */
 238    assert(sizeof(arrays[0]->Ptr[0]) == 1);
 239
 240    st_validate_state(ctx->st);
 241
 242    /* must get these after state validation! */
 243    vp = ctx->st->vp;
 244    vs = &ctx->st->state.vs->state;
 245
 246    /* loop over TGSI shader inputs to determine vertex buffer
 247     * and attribute info
 248     */
 249    for (attr = 0; attr < vs->num_inputs; attr++) {
 250       const GLuint mesaAttr = vp->index_to_input[attr];
 251       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 252       struct pipe_vertex_element velement;
 253
 254       if (bufobj && bufobj->Name) {
 255          /* Attribute data is in a VBO.
 256           * Recall that for VBOs, the gl_client_array->Ptr field is
 257           * really an offset from the start of the VBO, not a pointer.
 258           */
 259          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 260          assert(stobj->buffer);
 261
 262          vbuffer[attr].buffer = NULL;
 263          winsys->buffer_reference(winsys, &vbuffer[attr].buffer, stobj->buffer);
 264          vbuffer[attr].buffer_offset = (unsigned) arrays[0]->Ptr;/* in bytes */
 265          velement.src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
 266          assert(velement.src_offset <= 2048); /* 11-bit field */
 267       }
 268       else {
 269          /* attribute data is in user-space memory, not a VBO */
 270          uint bytes;
 271
 272          if (!arrays[mesaAttr]->StrideB) {
 273             bytes = arrays[mesaAttr]->Size
 274                     * _mesa_sizeof_type(arrays[mesaAttr]->Type);
 275          } else {
 276             bytes = arrays[mesaAttr]->StrideB * (max_index + 1);
 277          }
 278
 279          /* wrap user data */
 280          vbuffer[attr].buffer
 281             = winsys->user_buffer_create(winsys,
 282                                          (void *) arrays[mesaAttr]->Ptr,
 283                                          bytes);
 284          vbuffer[attr].buffer_offset = 0;
 285          velement.src_offset = 0;
 286       }
 287
 288       /* common-case setup */
 289       vbuffer[attr].pitch = arrays[mesaAttr]->StrideB; /* in bytes */
 290       vbuffer[attr].max_index = 0;  /* need this? */
 291       velement.vertex_buffer_index = attr;
 292       velement.nr_components = arrays[mesaAttr]->Size;
 293       velement.src_format = pipe_vertex_format(arrays[mesaAttr]->Type,
 294                                                arrays[mesaAttr]->Size,
 295                                                arrays[mesaAttr]->Normalized);
 296       assert(velement.src_format);
 297
 298       /* tell pipe about this attribute */
 299       pipe->set_vertex_buffer(pipe, attr, &vbuffer[attr]);
 300       pipe->set_vertex_element(pipe, attr, &velement);
 301    }
 302
 303
 304    /* do actual drawing */
 305    if (ib) {
 306       /* indexed primitive */
 307       struct gl_buffer_object *bufobj = ib->obj;
 308       struct pipe_buffer_handle *indexBuf = NULL;
 309       unsigned indexSize, indexOffset, i;
 310
 311       switch (ib->type) {
 312       case GL_UNSIGNED_INT:
 313          indexSize = 4;
 314          break;
 315       case GL_UNSIGNED_SHORT:
 316          indexSize = 2;
 317          break;
 318       case GL_UNSIGNED_BYTE:
 319          indexSize = 1;
 320          break;
 321       default:
 322          assert(0);
 323       }
 324
 325       /* get/create the index buffer object */
 326       if (bufobj && bufobj->Name) {
 327          /* elements/indexes are in a real VBO */
 328          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 329          winsys->buffer_reference(winsys, &indexBuf, stobj->buffer);
 330          indexOffset = (unsigned) ib->ptr / indexSize;
 331       }
 332       else {
 333          /* element/indicies are in user space memory */
 334          indexBuf = winsys->user_buffer_create(winsys,
 335                                                (void *) ib->ptr,
 336                                                ib->count * indexSize);
 337          indexOffset = 0;
 338       }
 339
 340       /* draw */
 341       for (i = 0; i < nr_prims; i++) {
 342          pipe->draw_elements(pipe, indexBuf, indexSize,
 343                              prims[i].mode,
 344                              prims[i].start + indexOffset, prims[i].count);
 345       }
 346
 347       winsys->buffer_reference(winsys, &indexBuf, NULL);
 348    }
 349    else {
 350       /* non-indexed */
 351       GLuint i;
 352       for (i = 0; i < nr_prims; i++) {
 353          pipe->draw_arrays(pipe, prims[i].mode, prims[i].start, prims[i].count);
 354       }
 355    }
 356
 357    /* unreference buffers (frees wrapped user-space buffer objects) */
 358    for (attr = 0; attr < vs->num_inputs; attr++) {
 359       winsys->buffer_reference(winsys, &vbuffer[attr].buffer, NULL);
 360       assert(!vbuffer[attr].buffer);
 361       pipe->set_vertex_buffer(pipe, attr, &vbuffer[attr]);
 362    }
 363 }
 364
 365
 366
 367 /**
 368  * Utility function for drawing simple primitives (such as quads for
 369  * glClear and glDrawPixels).  Coordinates are in screen space.
 370  * \param mode  one of PIPE_PRIM_x
 371  * \param numVertex  number of vertices
 372  * \param verts  vertex data (all attributes are float[4])
 373  * \param numAttribs  number of attributes per vertex
 374  */
 375 void
 376 st_draw_vertices(GLcontext *ctx, unsigned prim,
 377                  unsigned numVertex, float *verts,
 378                  unsigned numAttribs)
 379 {
 380    const float width = ctx->DrawBuffer->Width;
 381    const float height = ctx->DrawBuffer->Height;
 382    const unsigned vertex_bytes = numVertex * numAttribs * 4 * sizeof(float);
 383    struct pipe_context *pipe = ctx->st->pipe;
 384    struct pipe_buffer_handle *vbuf;
 385    struct pipe_vertex_buffer vbuffer;
 386    struct pipe_vertex_element velement;
 387    unsigned i;
 388
 389    assert(numAttribs > 0);
 390
 391    /* convert to clip coords */
 392    for (i = 0; i < numVertex; i++) {
 393       float x = verts[i * numAttribs * 4 + 0];
 394       float y = verts[i * numAttribs * 4 + 1];
 395       x = x / width * 2.0 - 1.0;
 396       y = y / height * 2.0 - 1.0;
 397       verts[i * numAttribs * 4 + 0] = x;
 398       verts[i * numAttribs * 4 + 1] = y;
 399    }
 400
 401    /* XXX create one-time */
 402    vbuf = pipe->winsys->buffer_create(pipe->winsys, 32, 0, 0);
 403    pipe->winsys->buffer_data(pipe->winsys, vbuf,
 404                              vertex_bytes, verts,
 405                              PIPE_BUFFER_USAGE_VERTEX);
 406
 407    /* tell pipe about the vertex buffer */
 408    vbuffer.buffer = vbuf;
 409    vbuffer.pitch = numAttribs * 4 * sizeof(float);  /* vertex size */
 410    vbuffer.buffer_offset = 0;
 411    pipe->set_vertex_buffer(pipe, 0, &vbuffer);
 412
 413    /* tell pipe about the vertex attributes */
 414    for (i = 0; i < numAttribs; i++) {
 415       velement.src_offset = i * 4 * sizeof(GLfloat);
 416       velement.vertex_buffer_index = 0;
 417       velement.src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 418       velement.nr_components = 4;
 419       pipe->set_vertex_element(pipe, i, &velement);
 420    }
 421
 422    /* draw */
 423    pipe->draw_arrays(pipe, prim, 0, numVertex);
 424
 425    /* XXX: do one-time */
 426    pipe->winsys->buffer_reference(pipe->winsys, &vbuf, NULL);
 427 }
 428
 429
 430 /**
 431  * Set the (private) draw module's post-transformed vertex format when in
 432  * GL_SELECT or GL_FEEDBACK mode or for glRasterPos.
 433  */
 434 static void
 435 set_feedback_vertex_format(GLcontext *ctx)
 436 {
 437    struct st_context *st = ctx->st;
 438    struct vertex_info vinfo;
 439    GLuint i;
 440
 441    if (ctx->RenderMode == GL_SELECT) {
 442       assert(ctx->RenderMode == GL_SELECT);
 443       vinfo.num_attribs = 1;
 444       vinfo.format[0] = FORMAT_4F;
 445       vinfo.interp_mode[0] = INTERP_NONE;
 446    }
 447    else {
 448       /* GL_FEEDBACK, or glRasterPos */
 449       /* emit all attribs (pos, color, texcoord) as GLfloat[4] */
 450       vinfo.num_attribs = st->state.vs->state.num_outputs;
 451       for (i = 0; i < vinfo.num_attribs; i++) {
 452          vinfo.format[i] = FORMAT_4F;
 453          vinfo.interp_mode[i] = INTERP_LINEAR;
 454       }
 455    }
 456
 457    draw_set_vertex_info(st->draw, &vinfo);
 458 }
 459
 460
 461 /**
 462  * Called by VBO to draw arrays when in selection or feedback mode and
 463  * to implement glRasterPos.
 464  * This is very much like the normal draw_vbo() function above.
 465  * Look at code refactoring some day.
 466  * Might move this into the failover module some day.
 467  */
 468 void
 469 st_feedback_draw_vbo(GLcontext *ctx,
 470                      const struct gl_client_array **arrays,
 471                      const struct _mesa_prim *prims,
 472                      GLuint nr_prims,
 473                      const struct _mesa_index_buffer *ib,
 474                      GLuint min_index,
 475                      GLuint max_index)
 476 {
 477    struct st_context *st = ctx->st;
 478    struct pipe_context *pipe = st->pipe;
 479    struct draw_context *draw = st->draw;
 480    struct pipe_winsys *winsys = pipe->winsys;
 481    const struct st_vertex_program *vp;
 482    const struct pipe_shader_state *vs;
 483    struct pipe_buffer_handle *index_buffer_handle = 0;
 484    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 485    GLuint attr, i;
 486    ubyte *mapped_constants;
 487
 488    assert(draw);
 489
 490    st_validate_state(ctx->st);
 491
 492    /* must get these after state validation! */
 493    vp = ctx->st->vp;
 494    vs = &ctx->st->state.vs->state;
 495
 496    /*
 497     * Set up the draw module's state.
 498     *
 499     * We'd like to do this less frequently, but the normal state-update
 500     * code sends state updates to the pipe, not to our private draw module.
 501     */
 502    assert(draw);
 503    draw_set_viewport_state(draw, &st->state.viewport);
 504    draw_set_clip_state(draw, &st->state.clip);
 505    draw_set_rasterizer_state(draw, &st->state.rasterizer->state);
 506    draw_bind_vertex_shader(draw, st->state.vs->data);
 507    set_feedback_vertex_format(ctx);
 508
 509    /* loop over TGSI shader inputs to determine vertex buffer
 510     * and attribute info
 511     */
 512    for (attr = 0; attr < vs->num_inputs; attr++) {
 513       const GLuint mesaAttr = vp->index_to_input[attr];
 514       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 515       struct pipe_vertex_element velement;
 516       void *map;
 517
 518       if (bufobj && bufobj->Name) {
 519          /* Attribute data is in a VBO.
 520           * Recall that for VBOs, the gl_client_array->Ptr field is
 521           * really an offset from the start of the VBO, not a pointer.
 522           */
 523          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 524          assert(stobj->buffer);
 525
 526          vbuffer[attr].buffer = NULL;
 527          winsys->buffer_reference(winsys, &vbuffer[attr].buffer, stobj->buffer);
 528          vbuffer[attr].buffer_offset = (unsigned) arrays[0]->Ptr;/* in bytes */
 529          velement.src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
 530       }
 531       else {
 532          /* attribute data is in user-space memory, not a VBO */
 533          uint bytes = (arrays[mesaAttr]->Size
 534                        * _mesa_sizeof_type(arrays[mesaAttr]->Type)
 535                        * (max_index + 1));
 536
 537          /* wrap user data */
 538          vbuffer[attr].buffer
 539             = winsys->user_buffer_create(winsys,
 540                                          (void *) arrays[mesaAttr]->Ptr,
 541                                          bytes);
 542          vbuffer[attr].buffer_offset = 0;
 543          velement.src_offset = 0;
 544       }
 545
 546       /* common-case setup */
 547       vbuffer[attr].pitch = arrays[mesaAttr]->StrideB; /* in bytes */
 548       vbuffer[attr].max_index = 0;  /* need this? */
 549       velement.vertex_buffer_index = attr;
 550       velement.nr_components = arrays[mesaAttr]->Size;
 551       velement.src_format = pipe_vertex_format(arrays[mesaAttr]->Type,
 552                                                arrays[mesaAttr]->Size,
 553                                                arrays[mesaAttr]->Normalized);
 554       assert(velement.src_format);
 555
 556       /* tell draw about this attribute */
 557       draw_set_vertex_buffer(draw, attr, &vbuffer[attr]);
 558       draw_set_vertex_element(draw, attr, &velement);
 559
 560       /* map the attrib buffer */
 561       map = pipe->winsys->buffer_map(pipe->winsys,
 562                                      vbuffer[attr].buffer,
 563                                      PIPE_BUFFER_FLAG_READ);
 564       draw_set_mapped_vertex_buffer(draw, attr, map);
 565    }
 566
 567    if (ib) {
 568       unsigned indexSize;
 569       struct gl_buffer_object *bufobj = ib->obj;
 570       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 571       index_buffer_handle = stobj->buffer;
 572       void *map;
 573
 574       switch (ib->type) {
 575       case GL_UNSIGNED_INT:
 576          indexSize = 4;
 577          break;
 578       case GL_UNSIGNED_SHORT:
 579          indexSize = 2;
 580          break;
 581       default:
 582          assert(0);
 583       }
 584
 585       map = pipe->winsys->buffer_map(pipe->winsys,
 586                                      index_buffer_handle,
 587                                      PIPE_BUFFER_FLAG_READ);
 588       draw_set_mapped_element_buffer(draw, indexSize, map);
 589    }
 590    else {
 591       /* no index/element buffer */
 592       draw_set_mapped_element_buffer(draw, 0, NULL);
 593    }
 594
 595
 596    /* map constant buffers */
 597    mapped_constants = winsys->buffer_map(winsys,
 598                                st->state.constants[PIPE_SHADER_VERTEX].buffer,
 599                                PIPE_BUFFER_FLAG_READ);
 600    draw_set_mapped_constant_buffer(st->draw, mapped_constants);
 601
 602
 603    /* draw here */
 604    for (i = 0; i < nr_prims; i++) {
 605       draw_arrays(draw, prims[i].mode, prims[i].start, prims[i].count);
 606    }
 607
 608
 609    /* unmap constant buffers */
 610    winsys->buffer_unmap(winsys, st->state.constants[PIPE_SHADER_VERTEX].buffer);
 611
 612    /*
 613     * unmap vertex/index buffers
 614     */
 615    for (i = 0; i < PIPE_ATTRIB_MAX; i++) {
 616       if (draw->vertex_buffer[i].buffer) {
 617          pipe->winsys->buffer_unmap(pipe->winsys,
 618                                     draw->vertex_buffer[i].buffer);
 619          draw_set_mapped_vertex_buffer(draw, i, NULL);
 620       }
 621    }
 622    if (ib) {
 623       pipe->winsys->buffer_unmap(pipe->winsys, index_buffer_handle);
 624       draw_set_mapped_element_buffer(draw, 0, NULL);
 625    }
 626 }
 627
 628
 629
 630 void st_init_draw( struct st_context *st )
 631 {
 632    GLcontext *ctx = st->ctx;
 633
 634    /* actually, not used here, but elsewhere */
 635    create_default_attribs_buffer(st);
 636
 637    vbo_set_draw_func(ctx, st_draw_vbo);
 638 }
 639
 640
 641 void st_destroy_draw( struct st_context *st )
 642 {
 643    destroy_default_attribs_buffer(st);
 644 }
 645
 646