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_context.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_winsys.h"
  47 #include "pipe/p_inlines.h"
  48
  49 #include "draw/draw_private.h"
  50 #include "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  * This function gets plugged into the VBO module and is called when
 195  * we have something to render.
 196  * Basically, translate the information into the format expected by pipe.
 197  */
 198 void
 199 st_draw_vbo(GLcontext *ctx,
 200             const struct gl_client_array **arrays,
 201             const struct _mesa_prim *prims,
 202             GLuint nr_prims,
 203             const struct _mesa_index_buffer *ib,
 204             GLuint min_index,
 205             GLuint max_index)
 206 {
 207    struct pipe_context *pipe = ctx->st->pipe;
 208    struct pipe_winsys *winsys = pipe->winsys;
 209    const struct st_vertex_program *vp;
 210    const struct pipe_shader_state *vs;
 211    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 212    GLuint attr;
 213    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 214
 215    /* sanity check for pointer arithmetic below */
 216    assert(sizeof(arrays[0]->Ptr[0]) == 1);
 217
 218    st_validate_state(ctx->st);
 219
 220    /* must get these after state validation! */
 221    vp = ctx->st->vp;
 222    vs = &ctx->st->vp->state;
 223
 224    /* loop over TGSI shader inputs to determine vertex buffer
 225     * and attribute info
 226     */
 227    for (attr = 0; attr < vp->num_inputs; attr++) {
 228       const GLuint mesaAttr = vp->index_to_input[attr];
 229       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 230
 231       if (bufobj && bufobj->Name) {
 232          /* Attribute data is in a VBO.
 233           * Recall that for VBOs, the gl_client_array->Ptr field is
 234           * really an offset from the start of the VBO, not a pointer.
 235           */
 236          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 237          assert(stobj->buffer);
 238
 239          vbuffer[attr].buffer = NULL;
 240          pipe_buffer_reference(winsys, &vbuffer[attr].buffer, stobj->buffer);
 241          vbuffer[attr].buffer_offset = (unsigned) arrays[0]->Ptr;/* in bytes */
 242          velements[attr].src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
 243          assert(velements[attr].src_offset <= 2048); /* 11-bit field */
 244       }
 245       else {
 246          /* attribute data is in user-space memory, not a VBO */
 247          uint bytes;
 248
 249          if (!arrays[mesaAttr]->StrideB) {
 250             bytes = arrays[mesaAttr]->Size
 251                     * _mesa_sizeof_type(arrays[mesaAttr]->Type);
 252          } else {
 253             bytes = arrays[mesaAttr]->StrideB * (max_index + 1);
 254          }
 255
 256          /* wrap user data */
 257          vbuffer[attr].buffer
 258             = winsys->user_buffer_create(winsys,
 259                                          (void *) arrays[mesaAttr]->Ptr,
 260                                          bytes);
 261          vbuffer[attr].buffer_offset = 0;
 262          velements[attr].src_offset = 0;
 263       }
 264
 265       /* common-case setup */
 266       vbuffer[attr].pitch = arrays[mesaAttr]->StrideB; /* in bytes */
 267       vbuffer[attr].max_index = max_index;
 268       velements[attr].vertex_buffer_index = attr;
 269       velements[attr].nr_components = arrays[mesaAttr]->Size;
 270       velements[attr].src_format
 271          = pipe_vertex_format(arrays[mesaAttr]->Type,
 272                               arrays[mesaAttr]->Size,
 273                               arrays[mesaAttr]->Normalized);
 274       assert(velements[attr].src_format);
 275    }
 276
 277    pipe->set_vertex_buffers(pipe, vp->num_inputs, vbuffer);
 278    pipe->set_vertex_elements(pipe, vp->num_inputs, velements);
 279
 280
 281    /* do actual drawing */
 282    if (ib) {
 283       /* indexed primitive */
 284       struct gl_buffer_object *bufobj = ib->obj;
 285       struct pipe_buffer *indexBuf = NULL;
 286       unsigned indexSize, indexOffset, i;
 287
 288       switch (ib->type) {
 289       case GL_UNSIGNED_INT:
 290          indexSize = 4;
 291          break;
 292       case GL_UNSIGNED_SHORT:
 293          indexSize = 2;
 294          break;
 295       case GL_UNSIGNED_BYTE:
 296          indexSize = 1;
 297          break;
 298       default:
 299          assert(0);
 300          return;
 301       }
 302
 303       /* get/create the index buffer object */
 304       if (bufobj && bufobj->Name) {
 305          /* elements/indexes are in a real VBO */
 306          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 307          pipe_buffer_reference(winsys, &indexBuf, stobj->buffer);
 308          indexOffset = (unsigned) ib->ptr / indexSize;
 309       }
 310       else {
 311          /* element/indicies are in user space memory */
 312          indexBuf = winsys->user_buffer_create(winsys,
 313                                                (void *) ib->ptr,
 314                                                ib->count * indexSize);
 315          indexOffset = 0;
 316       }
 317
 318       /* draw */
 319       for (i = 0; i < nr_prims; i++) {
 320          pipe->draw_elements(pipe, indexBuf, indexSize,
 321                              prims[i].mode,
 322                              prims[i].start + indexOffset, prims[i].count);
 323       }
 324
 325       pipe_buffer_reference(winsys, &indexBuf, NULL);
 326    }
 327    else {
 328       /* non-indexed */
 329       GLuint i;
 330       for (i = 0; i < nr_prims; i++) {
 331          pipe->draw_arrays(pipe, prims[i].mode, prims[i].start, prims[i].count);
 332       }
 333    }
 334
 335    /* unreference buffers (frees wrapped user-space buffer objects) */
 336    for (attr = 0; attr < vp->num_inputs; attr++) {
 337       pipe_buffer_reference(winsys, &vbuffer[attr].buffer, NULL);
 338       assert(!vbuffer[attr].buffer);
 339    }
 340    pipe->set_vertex_buffers(pipe, vp->num_inputs, vbuffer);
 341 }
 342
 343
 344
 345 /**
 346  * Utility function for drawing simple primitives (such as quads for
 347  * glClear and glDrawPixels).  Coordinates are in screen space.
 348  * \param mode  one of PIPE_PRIM_x
 349  * \param numVertex  number of vertices
 350  * \param verts  vertex data (all attributes are float[4])
 351  * \param numAttribs  number of attributes per vertex
 352  */
 353 void
 354 st_draw_vertices(GLcontext *ctx, unsigned prim,
 355                  unsigned numVertex, float *verts,
 356                  unsigned numAttribs,
 357                  GLboolean inClipCoords)
 358 {
 359    const float width = ctx->DrawBuffer->Width;
 360    const float height = ctx->DrawBuffer->Height;
 361    const unsigned vertex_bytes = numVertex * numAttribs * 4 * sizeof(float);
 362    struct pipe_context *pipe = ctx->st->pipe;
 363    struct pipe_buffer *vbuf;
 364    struct pipe_vertex_buffer vbuffer;
 365    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 366    unsigned i;
 367
 368    assert(numAttribs > 0);
 369
 370    if (!inClipCoords) {
 371       /* convert to clip coords */
 372       for (i = 0; i < numVertex; i++) {
 373          float x = verts[i * numAttribs * 4 + 0];
 374          float y = verts[i * numAttribs * 4 + 1];
 375          x = x / width * 2.0 - 1.0;
 376          y = y / height * 2.0 - 1.0;
 377          verts[i * numAttribs * 4 + 0] = x;
 378          verts[i * numAttribs * 4 + 1] = y;
 379       }
 380    }
 381
 382    /* XXX create one-time */
 383    vbuf = pipe->winsys->buffer_create(pipe->winsys, 32,
 384                                       PIPE_BUFFER_USAGE_VERTEX, vertex_bytes);
 385    assert(vbuf);
 386
 387    memcpy(pipe->winsys->buffer_map(pipe->winsys, vbuf,
 388                                    PIPE_BUFFER_USAGE_CPU_WRITE),
 389           verts, vertex_bytes);
 390    pipe->winsys->buffer_unmap(pipe->winsys, vbuf);
 391
 392    /* tell pipe about the vertex buffer */
 393    vbuffer.buffer = vbuf;
 394    vbuffer.pitch = numAttribs * 4 * sizeof(float);  /* vertex size */
 395    vbuffer.buffer_offset = 0;
 396    pipe->set_vertex_buffers(pipe, 1, &vbuffer);
 397
 398    /* tell pipe about the vertex attributes */
 399    for (i = 0; i < numAttribs; i++) {
 400       velements[i].src_offset = i * 4 * sizeof(GLfloat);
 401       velements[i].vertex_buffer_index = 0;
 402       velements[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 403       velements[i].nr_components = 4;
 404    }
 405    pipe->set_vertex_elements(pipe, numAttribs, velements);
 406
 407    /* draw */
 408    pipe->draw_arrays(pipe, prim, 0, numVertex);
 409
 410    /* XXX: do one-time */
 411    pipe_buffer_reference(pipe->winsys, &vbuf, NULL);
 412 }
 413
 414
 415 /**
 416  * Set the (private) draw module's post-transformed vertex format when in
 417  * GL_SELECT or GL_FEEDBACK mode or for glRasterPos.
 418  */
 419 static void
 420 set_feedback_vertex_format(GLcontext *ctx)
 421 {
 422 #if 0
 423    struct st_context *st = ctx->st;
 424    struct vertex_info vinfo;
 425    GLuint i;
 426
 427    memset(&vinfo, 0, sizeof(vinfo));
 428
 429    if (ctx->RenderMode == GL_SELECT) {
 430       assert(ctx->RenderMode == GL_SELECT);
 431       vinfo.num_attribs = 1;
 432       vinfo.format[0] = FORMAT_4F;
 433       vinfo.interp_mode[0] = INTERP_LINEAR;
 434    }
 435    else {
 436       /* GL_FEEDBACK, or glRasterPos */
 437       /* emit all attribs (pos, color, texcoord) as GLfloat[4] */
 438       vinfo.num_attribs = st->state.vs->cso->state.num_outputs;
 439       for (i = 0; i < vinfo.num_attribs; i++) {
 440          vinfo.format[i] = FORMAT_4F;
 441          vinfo.interp_mode[i] = INTERP_LINEAR;
 442       }
 443    }
 444
 445    draw_set_vertex_info(st->draw, &vinfo);
 446 #endif
 447 }
 448
 449
 450 /**
 451  * Called by VBO to draw arrays when in selection or feedback mode and
 452  * to implement glRasterPos.
 453  * This is very much like the normal draw_vbo() function above.
 454  * Look at code refactoring some day.
 455  * Might move this into the failover module some day.
 456  */
 457 void
 458 st_feedback_draw_vbo(GLcontext *ctx,
 459                      const struct gl_client_array **arrays,
 460                      const struct _mesa_prim *prims,
 461                      GLuint nr_prims,
 462                      const struct _mesa_index_buffer *ib,
 463                      GLuint min_index,
 464                      GLuint max_index)
 465 {
 466    struct st_context *st = ctx->st;
 467    struct pipe_context *pipe = st->pipe;
 468    struct draw_context *draw = st->draw;
 469    struct pipe_winsys *winsys = pipe->winsys;
 470    const struct st_vertex_program *vp;
 471    const struct pipe_shader_state *vs;
 472    struct pipe_buffer *index_buffer_handle = 0;
 473    struct pipe_vertex_buffer vbuffers[PIPE_MAX_SHADER_INPUTS];
 474    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 475    GLuint attr, i;
 476    ubyte *mapped_constants;
 477
 478    assert(draw);
 479
 480    st_validate_state(ctx->st);
 481
 482    /* must get these after state validation! */
 483    vp = ctx->st->vp;
 484    vs = &st->vp->state;
 485
 486    if (!st->vp->draw_shader) {
 487       st->vp->draw_shader = draw_create_vertex_shader(draw, vs);
 488    }
 489
 490    /*
 491     * Set up the draw module's state.
 492     *
 493     * We'd like to do this less frequently, but the normal state-update
 494     * code sends state updates to the pipe, not to our private draw module.
 495     */
 496    assert(draw);
 497    draw_set_viewport_state(draw, &st->state.viewport);
 498    draw_set_clip_state(draw, &st->state.clip);
 499    draw_set_rasterizer_state(draw, &st->state.rasterizer);
 500    draw_bind_vertex_shader(draw, st->vp->draw_shader);
 501    set_feedback_vertex_format(ctx);
 502
 503    /* loop over TGSI shader inputs to determine vertex buffer
 504     * and attribute info
 505     */
 506    for (attr = 0; attr < vp->num_inputs; attr++) {
 507       const GLuint mesaAttr = vp->index_to_input[attr];
 508       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 509       void *map;
 510
 511       if (bufobj && bufobj->Name) {
 512          /* Attribute data is in a VBO.
 513           * Recall that for VBOs, the gl_client_array->Ptr field is
 514           * really an offset from the start of the VBO, not a pointer.
 515           */
 516          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 517          assert(stobj->buffer);
 518
 519          vbuffers[attr].buffer = NULL;
 520          pipe_buffer_reference(winsys, &vbuffers[attr].buffer, stobj->buffer);
 521          vbuffers[attr].buffer_offset = (unsigned) arrays[0]->Ptr;/* in bytes */
 522          velements[attr].src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
 523       }
 524       else {
 525          /* attribute data is in user-space memory, not a VBO */
 526          uint bytes = (arrays[mesaAttr]->Size
 527                        * _mesa_sizeof_type(arrays[mesaAttr]->Type)
 528                        * (max_index + 1));
 529
 530          /* wrap user data */
 531          vbuffers[attr].buffer
 532             = winsys->user_buffer_create(winsys,
 533                                          (void *) arrays[mesaAttr]->Ptr,
 534                                          bytes);
 535          vbuffers[attr].buffer_offset = 0;
 536          velements[attr].src_offset = 0;
 537       }
 538
 539       /* common-case setup */
 540       vbuffers[attr].pitch = arrays[mesaAttr]->StrideB; /* in bytes */
 541       vbuffers[attr].max_index = max_index;
 542       velements[attr].vertex_buffer_index = attr;
 543       velements[attr].nr_components = arrays[mesaAttr]->Size;
 544       velements[attr].src_format = pipe_vertex_format(arrays[mesaAttr]->Type,
 545                                                arrays[mesaAttr]->Size,
 546                                                arrays[mesaAttr]->Normalized);
 547       assert(velements[attr].src_format);
 548
 549       /* tell draw about this attribute */
 550 #if 0
 551       draw_set_vertex_buffer(draw, attr, &vbuffer[attr]);
 552 #endif
 553
 554       /* map the attrib buffer */
 555       map = pipe->winsys->buffer_map(pipe->winsys,
 556                                      vbuffers[attr].buffer,
 557                                      PIPE_BUFFER_USAGE_CPU_READ);
 558       draw_set_mapped_vertex_buffer(draw, attr, map);
 559    }
 560
 561    draw_set_vertex_buffers(draw, vp->num_inputs, vbuffers);
 562    draw_set_vertex_elements(draw, vp->num_inputs, velements);
 563
 564    if (ib) {
 565       unsigned indexSize;
 566       struct gl_buffer_object *bufobj = ib->obj;
 567       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 568       index_buffer_handle = stobj->buffer;
 569       void *map;
 570
 571       switch (ib->type) {
 572       case GL_UNSIGNED_INT:
 573          indexSize = 4;
 574          break;
 575       case GL_UNSIGNED_SHORT:
 576          indexSize = 2;
 577          break;
 578       default:
 579          assert(0);
 580          return;
 581       }
 582
 583       map = pipe->winsys->buffer_map(pipe->winsys,
 584                                      index_buffer_handle,
 585                                      PIPE_BUFFER_USAGE_CPU_READ);
 586       draw_set_mapped_element_buffer(draw, indexSize, map);
 587    }
 588    else {
 589       /* no index/element buffer */
 590       draw_set_mapped_element_buffer(draw, 0, NULL);
 591    }
 592
 593
 594    /* map constant buffers */
 595    mapped_constants = winsys->buffer_map(winsys,
 596                                st->state.constants[PIPE_SHADER_VERTEX].buffer,
 597                                PIPE_BUFFER_USAGE_CPU_READ);
 598    draw_set_mapped_constant_buffer(st->draw, mapped_constants);
 599
 600
 601    /* draw here */
 602    for (i = 0; i < nr_prims; i++) {
 603       draw_arrays(draw, prims[i].mode, prims[i].start, prims[i].count);
 604    }
 605
 606
 607    /* unmap constant buffers */
 608    winsys->buffer_unmap(winsys, st->state.constants[PIPE_SHADER_VERTEX].buffer);
 609
 610    /*
 611     * unmap vertex/index buffers
 612     */
 613    for (i = 0; i < PIPE_MAX_ATTRIBS; i++) {
 614       if (draw->vertex_buffer[i].buffer) {
 615          pipe->winsys->buffer_unmap(pipe->winsys,
 616                                     draw->vertex_buffer[i].buffer);
 617          pipe_buffer_reference(winsys, &draw->vertex_buffer[i].buffer, NULL);
 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    vbo_set_draw_func(ctx, st_draw_vbo);
 634 }
 635
 636
 637 void st_destroy_draw( struct st_context *st )
 638 {
 639 }
 640
 641