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