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  * This file implements the st_draw_vbo() function which is called from
  30  * Mesa's VBO module.  All point/line/triangle rendering is done through
  31  * this function whether the user called glBegin/End, glDrawArrays,
  32  * glDrawElements, glEvalMesh, or glCalList, etc.
  33  *
  34  * We basically convert the VBO's vertex attribute/array information into
  35  * Gallium vertex state, bind the vertex buffer objects and call
  36  * pipe->draw_elements(), pipe->draw_range_elements() or pipe->draw_arrays().
  37  *
  38  * Authors:
  39  *   Keith Whitwell <keith@tungstengraphics.com>
  40  */
  41
  42
  43 #include "main/imports.h"
  44 #include "main/image.h"
  45 #include "main/macros.h"
  46 #include "shader/prog_uniform.h"
  47
  48 #include "vbo/vbo.h"
  49
  50 #include "st_context.h"
  51 #include "st_atom.h"
  52 #include "st_cb_bufferobjects.h"
  53 #include "st_draw.h"
  54 #include "st_program.h"
  55
  56 #include "pipe/p_context.h"
  57 #include "pipe/p_defines.h"
  58 #include "util/u_inlines.h"
  59
  60
  61 static GLuint double_types[4] = {
  62    PIPE_FORMAT_R64_FLOAT,
  63    PIPE_FORMAT_R64G64_FLOAT,
  64    PIPE_FORMAT_R64G64B64_FLOAT,
  65    PIPE_FORMAT_R64G64B64A64_FLOAT
  66 };
  67
  68 static GLuint float_types[4] = {
  69    PIPE_FORMAT_R32_FLOAT,
  70    PIPE_FORMAT_R32G32_FLOAT,
  71    PIPE_FORMAT_R32G32B32_FLOAT,
  72    PIPE_FORMAT_R32G32B32A32_FLOAT
  73 };
  74
  75 static GLuint uint_types_norm[4] = {
  76    PIPE_FORMAT_R32_UNORM,
  77    PIPE_FORMAT_R32G32_UNORM,
  78    PIPE_FORMAT_R32G32B32_UNORM,
  79    PIPE_FORMAT_R32G32B32A32_UNORM
  80 };
  81
  82 static GLuint uint_types_scale[4] = {
  83    PIPE_FORMAT_R32_USCALED,
  84    PIPE_FORMAT_R32G32_USCALED,
  85    PIPE_FORMAT_R32G32B32_USCALED,
  86    PIPE_FORMAT_R32G32B32A32_USCALED
  87 };
  88
  89 static GLuint int_types_norm[4] = {
  90    PIPE_FORMAT_R32_SNORM,
  91    PIPE_FORMAT_R32G32_SNORM,
  92    PIPE_FORMAT_R32G32B32_SNORM,
  93    PIPE_FORMAT_R32G32B32A32_SNORM
  94 };
  95
  96 static GLuint int_types_scale[4] = {
  97    PIPE_FORMAT_R32_SSCALED,
  98    PIPE_FORMAT_R32G32_SSCALED,
  99    PIPE_FORMAT_R32G32B32_SSCALED,
 100    PIPE_FORMAT_R32G32B32A32_SSCALED
 101 };
 102
 103 static GLuint ushort_types_norm[4] = {
 104    PIPE_FORMAT_R16_UNORM,
 105    PIPE_FORMAT_R16G16_UNORM,
 106    PIPE_FORMAT_R16G16B16_UNORM,
 107    PIPE_FORMAT_R16G16B16A16_UNORM
 108 };
 109
 110 static GLuint ushort_types_scale[4] = {
 111    PIPE_FORMAT_R16_USCALED,
 112    PIPE_FORMAT_R16G16_USCALED,
 113    PIPE_FORMAT_R16G16B16_USCALED,
 114    PIPE_FORMAT_R16G16B16A16_USCALED
 115 };
 116
 117 static GLuint short_types_norm[4] = {
 118    PIPE_FORMAT_R16_SNORM,
 119    PIPE_FORMAT_R16G16_SNORM,
 120    PIPE_FORMAT_R16G16B16_SNORM,
 121    PIPE_FORMAT_R16G16B16A16_SNORM
 122 };
 123
 124 static GLuint short_types_scale[4] = {
 125    PIPE_FORMAT_R16_SSCALED,
 126    PIPE_FORMAT_R16G16_SSCALED,
 127    PIPE_FORMAT_R16G16B16_SSCALED,
 128    PIPE_FORMAT_R16G16B16A16_SSCALED
 129 };
 130
 131 static GLuint ubyte_types_norm[4] = {
 132    PIPE_FORMAT_R8_UNORM,
 133    PIPE_FORMAT_R8G8_UNORM,
 134    PIPE_FORMAT_R8G8B8_UNORM,
 135    PIPE_FORMAT_R8G8B8A8_UNORM
 136 };
 137
 138 static GLuint ubyte_types_scale[4] = {
 139    PIPE_FORMAT_R8_USCALED,
 140    PIPE_FORMAT_R8G8_USCALED,
 141    PIPE_FORMAT_R8G8B8_USCALED,
 142    PIPE_FORMAT_R8G8B8A8_USCALED
 143 };
 144
 145 static GLuint byte_types_norm[4] = {
 146    PIPE_FORMAT_R8_SNORM,
 147    PIPE_FORMAT_R8G8_SNORM,
 148    PIPE_FORMAT_R8G8B8_SNORM,
 149    PIPE_FORMAT_R8G8B8A8_SNORM
 150 };
 151
 152 static GLuint byte_types_scale[4] = {
 153    PIPE_FORMAT_R8_SSCALED,
 154    PIPE_FORMAT_R8G8_SSCALED,
 155    PIPE_FORMAT_R8G8B8_SSCALED,
 156    PIPE_FORMAT_R8G8B8A8_SSCALED
 157 };
 158
 159 static GLuint fixed_types[4] = {
 160    PIPE_FORMAT_R32_FIXED,
 161    PIPE_FORMAT_R32G32_FIXED,
 162    PIPE_FORMAT_R32G32B32_FIXED,
 163    PIPE_FORMAT_R32G32B32A32_FIXED
 164 };
 165
 166
 167
 168 /**
 169  * Return a PIPE_FORMAT_x for the given GL datatype and size.
 170  */
 171 GLuint
 172 st_pipe_vertex_format(GLenum type, GLuint size, GLenum format,
 173                       GLboolean normalized)
 174 {
 175    assert((type >= GL_BYTE && type <= GL_DOUBLE) ||
 176           type == GL_FIXED);
 177    assert(size >= 1);
 178    assert(size <= 4);
 179    assert(format == GL_RGBA || format == GL_BGRA);
 180
 181    if (format == GL_BGRA) {
 182       /* this is an odd-ball case */
 183       assert(type == GL_UNSIGNED_BYTE);
 184       assert(normalized);
 185       return PIPE_FORMAT_B8G8R8A8_UNORM;
 186    }
 187
 188    if (normalized) {
 189       switch (type) {
 190       case GL_DOUBLE: return double_types[size-1];
 191       case GL_FLOAT: return float_types[size-1];
 192       case GL_INT: return int_types_norm[size-1];
 193       case GL_SHORT: return short_types_norm[size-1];
 194       case GL_BYTE: return byte_types_norm[size-1];
 195       case GL_UNSIGNED_INT: return uint_types_norm[size-1];
 196       case GL_UNSIGNED_SHORT: return ushort_types_norm[size-1];
 197       case GL_UNSIGNED_BYTE: return ubyte_types_norm[size-1];
 198       case GL_FIXED: return fixed_types[size-1];
 199       default: assert(0); return 0;
 200       }
 201    }
 202    else {
 203       switch (type) {
 204       case GL_DOUBLE: return double_types[size-1];
 205       case GL_FLOAT: return float_types[size-1];
 206       case GL_INT: return int_types_scale[size-1];
 207       case GL_SHORT: return short_types_scale[size-1];
 208       case GL_BYTE: return byte_types_scale[size-1];
 209       case GL_UNSIGNED_INT: return uint_types_scale[size-1];
 210       case GL_UNSIGNED_SHORT: return ushort_types_scale[size-1];
 211       case GL_UNSIGNED_BYTE: return ubyte_types_scale[size-1];
 212       case GL_FIXED: return fixed_types[size-1];
 213       default: assert(0); return 0;
 214       }
 215    }
 216    return 0; /* silence compiler warning */
 217 }
 218
 219
 220
 221
 222
 223 /**
 224  * Examine the active arrays to determine if we have interleaved
 225  * vertex arrays all living in one VBO, or all living in user space.
 226  * \param userSpace  returns whether the arrays are in user space.
 227  */
 228 static GLboolean
 229 is_interleaved_arrays(const struct st_vertex_program *vp,
 230                       const struct st_vp_varient *vpv,
 231                       const struct gl_client_array **arrays,
 232                       GLboolean *userSpace)
 233 {
 234    GLuint attr;
 235    const struct gl_buffer_object *firstBufObj = NULL;
 236    GLint firstStride = -1;
 237    GLuint num_client_arrays = 0;
 238    const GLubyte *client_addr = NULL;
 239
 240    for (attr = 0; attr < vpv->num_inputs; attr++) {
 241       const GLuint mesaAttr = vp->index_to_input[attr];
 242       const struct gl_buffer_object *bufObj = arrays[mesaAttr]->BufferObj;
 243       const GLsizei stride = arrays[mesaAttr]->StrideB; /* in bytes */
 244
 245       if (firstStride < 0) {
 246          firstStride = stride;
 247       }
 248       else if (firstStride != stride) {
 249          return GL_FALSE;
 250       }
 251
 252       if (!bufObj || !bufObj->Name) {
 253          num_client_arrays++;
 254          /* Try to detect if the client-space arrays are
 255           * "close" to each other.
 256           */
 257          if (!client_addr) {
 258             client_addr = arrays[mesaAttr]->Ptr;
 259          }
 260          else if (abs(arrays[mesaAttr]->Ptr - client_addr) > firstStride) {
 261             /* arrays start too far apart */
 262             return GL_FALSE;
 263          }
 264       }
 265       else if (!firstBufObj) {
 266          firstBufObj = bufObj;
 267       }
 268       else if (bufObj != firstBufObj) {
 269          return GL_FALSE;
 270       }
 271    }
 272
 273    *userSpace = (num_client_arrays == vpv->num_inputs);
 274    /* printf("user space: %d (%d %d)\n", (int) *userSpace,num_client_arrays,vp->num_inputs); */
 275
 276    return GL_TRUE;
 277 }
 278
 279
 280 /**
 281  * Compute the memory range occupied by the arrays.
 282  */
 283 static void
 284 get_arrays_bounds(const struct st_vertex_program *vp,
 285                   const struct st_vp_varient *vpv,
 286                   const struct gl_client_array **arrays,
 287                   GLuint max_index,
 288                   const GLubyte **low, const GLubyte **high)
 289 {
 290    const GLubyte *low_addr = NULL;
 291    const GLubyte *high_addr = NULL;
 292    GLuint attr;
 293
 294    for (attr = 0; attr < vpv->num_inputs; attr++) {
 295       const GLuint mesaAttr = vp->index_to_input[attr];
 296       const GLint stride = arrays[mesaAttr]->StrideB;
 297       const GLubyte *start = arrays[mesaAttr]->Ptr;
 298       const unsigned sz = (arrays[mesaAttr]->Size *
 299                            _mesa_sizeof_type(arrays[mesaAttr]->Type));
 300       const GLubyte *end = start + (max_index * stride) + sz;
 301
 302       if (attr == 0) {
 303          low_addr = start;
 304          high_addr = end;
 305       }
 306       else {
 307          low_addr = MIN2(low_addr, start);
 308          high_addr = MAX2(high_addr, end);
 309       }
 310    }
 311
 312    *low = low_addr;
 313    *high = high_addr;
 314 }
 315
 316
 317 /**
 318  * Set up for drawing interleaved arrays that all live in one VBO
 319  * or all live in user space.
 320  * \param vbuffer  returns vertex buffer info
 321  * \param velements  returns vertex element info
 322  */
 323 static void
 324 setup_interleaved_attribs(GLcontext *ctx,
 325                           const struct st_vertex_program *vp,
 326                           const struct st_vp_varient *vpv,
 327                           const struct gl_client_array **arrays,
 328                           GLuint max_index,
 329                           GLboolean userSpace,
 330                           struct pipe_vertex_buffer *vbuffer,
 331                           struct pipe_vertex_element velements[])
 332 {
 333    struct pipe_context *pipe = ctx->st->pipe;
 334    GLuint attr;
 335    const GLubyte *offset0 = NULL;
 336
 337    for (attr = 0; attr < vpv->num_inputs; attr++) {
 338       const GLuint mesaAttr = vp->index_to_input[attr];
 339       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 340       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 341       GLsizei stride = arrays[mesaAttr]->StrideB;
 342
 343       /*printf("stobj %u = %p\n", attr, (void*)stobj);*/
 344
 345       if (attr == 0) {
 346          const GLubyte *low, *high;
 347
 348          get_arrays_bounds(vp, vpv, arrays, max_index, &low, &high);
 349          /*printf("buffer range: %p %p  %d\n", low, high, high-low);*/
 350
 351          offset0 = low;
 352          if (userSpace) {
 353             vbuffer->buffer =
 354                pipe_user_buffer_create(pipe->screen, (void *) low, high - low);
 355             vbuffer->buffer_offset = 0;
 356          }
 357          else {
 358             vbuffer->buffer = NULL;
 359             pipe_buffer_reference(&vbuffer->buffer, stobj->buffer);
 360             vbuffer->buffer_offset = pointer_to_offset(low);
 361          }
 362          vbuffer->stride = stride; /* in bytes */
 363          vbuffer->max_index = max_index;
 364       }
 365
 366       velements[attr].src_offset =
 367          (unsigned) (arrays[mesaAttr]->Ptr - offset0);
 368       velements[attr].instance_divisor = 0;
 369       velements[attr].vertex_buffer_index = 0;
 370       velements[attr].nr_components = arrays[mesaAttr]->Size;
 371       velements[attr].src_format =
 372          st_pipe_vertex_format(arrays[mesaAttr]->Type,
 373                                arrays[mesaAttr]->Size,
 374                                arrays[mesaAttr]->Format,
 375                                arrays[mesaAttr]->Normalized);
 376       assert(velements[attr].src_format);
 377    }
 378 }
 379
 380
 381 /**
 382  * Set up a separate pipe_vertex_buffer and pipe_vertex_element for each
 383  * vertex attribute.
 384  * \param vbuffer  returns vertex buffer info
 385  * \param velements  returns vertex element info
 386  */
 387 static void
 388 setup_non_interleaved_attribs(GLcontext *ctx,
 389                               const struct st_vertex_program *vp,
 390                               const struct st_vp_varient *vpv,
 391                               const struct gl_client_array **arrays,
 392                               GLuint max_index,
 393                               GLboolean *userSpace,
 394                               struct pipe_vertex_buffer vbuffer[],
 395                               struct pipe_vertex_element velements[])
 396 {
 397    struct pipe_context *pipe = ctx->st->pipe;
 398    GLuint attr;
 399
 400    for (attr = 0; attr < vpv->num_inputs; attr++) {
 401       const GLuint mesaAttr = vp->index_to_input[attr];
 402       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 403       GLsizei stride = arrays[mesaAttr]->StrideB;
 404
 405       *userSpace = GL_FALSE;
 406
 407       if (bufobj && bufobj->Name) {
 408          /* Attribute data is in a VBO.
 409           * Recall that for VBOs, the gl_client_array->Ptr field is
 410           * really an offset from the start of the VBO, not a pointer.
 411           */
 412          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 413          assert(stobj->buffer);
 414          /*printf("stobj %u = %p\n", attr, (void*) stobj);*/
 415
 416          vbuffer[attr].buffer = NULL;
 417          pipe_buffer_reference(&vbuffer[attr].buffer, stobj->buffer);
 418          vbuffer[attr].buffer_offset = pointer_to_offset(arrays[mesaAttr]->Ptr);
 419          velements[attr].src_offset = 0;
 420       }
 421       else {
 422          /* attribute data is in user-space memory, not a VBO */
 423          uint bytes;
 424          /*printf("user-space array %d stride %d\n", attr, stride);*/
 425
 426          *userSpace = GL_TRUE;
 427
 428          /* wrap user data */
 429          if (arrays[mesaAttr]->Ptr) {
 430             /* user's vertex array */
 431             if (arrays[mesaAttr]->StrideB) {
 432                bytes = arrays[mesaAttr]->StrideB * (max_index + 1);
 433             }
 434             else {
 435                bytes = arrays[mesaAttr]->Size
 436                   * _mesa_sizeof_type(arrays[mesaAttr]->Type);
 437             }
 438             vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
 439                            (void *) arrays[mesaAttr]->Ptr, bytes);
 440          }
 441          else {
 442             /* no array, use ctx->Current.Attrib[] value */
 443             bytes = sizeof(ctx->Current.Attrib[0]);
 444             vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
 445                            (void *) ctx->Current.Attrib[mesaAttr], bytes);
 446             stride = 0;
 447          }
 448
 449          vbuffer[attr].buffer_offset = 0;
 450          velements[attr].src_offset = 0;
 451       }
 452
 453       assert(velements[attr].src_offset <= 2048); /* 11-bit field */
 454
 455       /* common-case setup */
 456       vbuffer[attr].stride = stride; /* in bytes */
 457       vbuffer[attr].max_index = max_index;
 458       velements[attr].instance_divisor = 0;
 459       velements[attr].vertex_buffer_index = attr;
 460       velements[attr].nr_components = arrays[mesaAttr]->Size;
 461       velements[attr].src_format
 462          = st_pipe_vertex_format(arrays[mesaAttr]->Type,
 463                                  arrays[mesaAttr]->Size,
 464                                  arrays[mesaAttr]->Format,
 465                                  arrays[mesaAttr]->Normalized);
 466       assert(velements[attr].src_format);
 467    }
 468 }
 469
 470
 471
 472 /**
 473  * Prior to drawing, check that any uniforms referenced by the
 474  * current shader have been set.  If a uniform has not been set,
 475  * issue a warning.
 476  */
 477 static void
 478 check_uniforms(GLcontext *ctx)
 479 {
 480    const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
 481    if (shProg && shProg->LinkStatus) {
 482       GLuint i;
 483       for (i = 0; i < shProg->Uniforms->NumUniforms; i++) {
 484          const struct gl_uniform *u = &shProg->Uniforms->Uniforms[i];
 485          if (!u->Initialized) {
 486             _mesa_warning(ctx,
 487                           "Using shader with uninitialized uniform: %s",
 488                           u->Name);
 489          }
 490       }
 491    }
 492 }
 493
 494
 495 static unsigned translate_prim( GLcontext *ctx,
 496                                 unsigned prim )
 497 {
 498    /* Avoid quadstrips if it's easy to do so:
 499     */
 500    if (prim == GL_QUAD_STRIP &&
 501        ctx->Light.ShadeModel != GL_FLAT &&
 502        ctx->Polygon.FrontMode == GL_FILL &&
 503        ctx->Polygon.BackMode == GL_FILL)
 504       prim = GL_TRIANGLE_STRIP;
 505
 506    return prim;
 507 }
 508
 509 /**
 510  * This function gets plugged into the VBO module and is called when
 511  * we have something to render.
 512  * Basically, translate the information into the format expected by gallium.
 513  */
 514 void
 515 st_draw_vbo(GLcontext *ctx,
 516             const struct gl_client_array **arrays,
 517             const struct _mesa_prim *prims,
 518             GLuint nr_prims,
 519             const struct _mesa_index_buffer *ib,
 520             GLboolean index_bounds_valid,
 521             GLuint min_index,
 522             GLuint max_index)
 523 {
 524    struct pipe_context *pipe = ctx->st->pipe;
 525    const struct st_vertex_program *vp;
 526    const struct st_vp_varient *vpv;
 527    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 528    GLuint attr;
 529    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 530    unsigned num_vbuffers, num_velements;
 531    GLboolean userSpace = GL_FALSE;
 532    GLboolean vertDataEdgeFlags;
 533
 534    /* Mesa core state should have been validated already */
 535    assert(ctx->NewState == 0x0);
 536
 537    /* Gallium probably doesn't want this in some cases. */
 538    if (!index_bounds_valid)
 539       if (!vbo_all_varyings_in_vbos(arrays))
 540          vbo_get_minmax_index(ctx, prims, ib, &min_index, &max_index);
 541
 542    /* sanity check for pointer arithmetic below */
 543    assert(sizeof(arrays[0]->Ptr[0]) == 1);
 544
 545    vertDataEdgeFlags = arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj &&
 546                        arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj->Name;
 547    if (vertDataEdgeFlags != ctx->st->vertdata_edgeflags) {
 548       ctx->st->vertdata_edgeflags = vertDataEdgeFlags;
 549       ctx->st->dirty.st |= ST_NEW_EDGEFLAGS_DATA;
 550    }
 551
 552    st_validate_state(ctx->st);
 553
 554    /* must get these after state validation! */
 555    vp = ctx->st->vp;
 556    vpv = ctx->st->vp_varient;
 557
 558 #if 0
 559    if (MESA_VERBOSE & VERBOSE_GLSL) {
 560       check_uniforms(ctx);
 561    }
 562 #else
 563    (void) check_uniforms;
 564 #endif
 565
 566    /*
 567     * Setup the vbuffer[] and velements[] arrays.
 568     */
 569    if (is_interleaved_arrays(vp, vpv, arrays, &userSpace)) {
 570       /*printf("Draw interleaved\n");*/
 571       setup_interleaved_attribs(ctx, vp, vpv, arrays, max_index, userSpace,
 572                                 vbuffer, velements);
 573       num_vbuffers = 1;
 574       num_velements = vpv->num_inputs;
 575       if (num_velements == 0)
 576          num_vbuffers = 0;
 577    }
 578    else {
 579       /*printf("Draw non-interleaved\n");*/
 580       setup_non_interleaved_attribs(ctx, vp, vpv, arrays, max_index,
 581                                     &userSpace, vbuffer, velements);
 582       num_vbuffers = vpv->num_inputs;
 583       num_velements = vpv->num_inputs;
 584    }
 585
 586 #if 0
 587    {
 588       GLuint i;
 589       for (i = 0; i < num_vbuffers; i++) {
 590          printf("buffers[%d].stride = %u\n", i, vbuffer[i].stride);
 591          printf("buffers[%d].max_index = %u\n", i, vbuffer[i].max_index);
 592          printf("buffers[%d].buffer_offset = %u\n", i, vbuffer[i].buffer_offset);
 593          printf("buffers[%d].buffer = %p\n", i, (void*) vbuffer[i].buffer);
 594       }
 595       for (i = 0; i < num_velements; i++) {
 596          printf("vlements[%d].vbuffer_index = %u\n", i, velements[i].vertex_buffer_index);
 597          printf("vlements[%d].src_offset = %u\n", i, velements[i].src_offset);
 598          printf("vlements[%d].nr_comps = %u\n", i, velements[i].nr_components);
 599          printf("vlements[%d].format = %s\n", i, pf_name(velements[i].src_format));
 600       }
 601    }
 602 #endif
 603
 604    pipe->set_vertex_buffers(pipe, num_vbuffers, vbuffer);
 605    pipe->set_vertex_elements(pipe, num_velements, velements);
 606
 607    if (num_vbuffers == 0 || num_velements == 0)
 608       return;
 609
 610    /* do actual drawing */
 611    if (ib) {
 612       /* indexed primitive */
 613       struct gl_buffer_object *bufobj = ib->obj;
 614       struct pipe_buffer *indexBuf = NULL;
 615       unsigned indexSize, indexOffset, i;
 616       unsigned prim;
 617
 618       switch (ib->type) {
 619       case GL_UNSIGNED_INT:
 620          indexSize = 4;
 621          break;
 622       case GL_UNSIGNED_SHORT:
 623          indexSize = 2;
 624          break;
 625       case GL_UNSIGNED_BYTE:
 626          indexSize = 1;
 627          break;
 628       default:
 629          assert(0);
 630          return;
 631       }
 632
 633       /* get/create the index buffer object */
 634       if (bufobj && bufobj->Name) {
 635          /* elements/indexes are in a real VBO */
 636          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 637          pipe_buffer_reference(&indexBuf, stobj->buffer);
 638          indexOffset = pointer_to_offset(ib->ptr) / indexSize;
 639       }
 640       else {
 641          /* element/indicies are in user space memory */
 642          indexBuf = pipe_user_buffer_create(pipe->screen, (void *) ib->ptr,
 643                                             ib->count * indexSize);
 644          indexOffset = 0;
 645       }
 646
 647       /* draw */
 648       if (nr_prims == 1 && pipe->draw_range_elements != NULL) {
 649          i = 0;
 650
 651          /* XXX: exercise temporary path to pass min/max directly
 652           * through to driver & draw module.  These interfaces still
 653           * need a bit of work...
 654           */
 655          prim = translate_prim( ctx, prims[i].mode );
 656
 657          pipe->draw_range_elements(pipe, indexBuf, indexSize,
 658                                    min_index,
 659                                    max_index,
 660                                    prim,
 661                                    prims[i].start + indexOffset, prims[i].count);
 662       }
 663       else {
 664          for (i = 0; i < nr_prims; i++) {
 665             prim = translate_prim( ctx, prims[i].mode );
 666
 667             pipe->draw_elements(pipe, indexBuf, indexSize,
 668                                 prim,
 669                                 prims[i].start + indexOffset, prims[i].count);
 670          }
 671       }
 672
 673       pipe_buffer_reference(&indexBuf, NULL);
 674    }
 675    else {
 676       /* non-indexed */
 677       GLuint i;
 678       GLuint prim;
 679
 680       for (i = 0; i < nr_prims; i++) {
 681          prim = translate_prim( ctx, prims[i].mode );
 682
 683          pipe->draw_arrays(pipe, prim, prims[i].start, prims[i].count);
 684       }
 685    }
 686
 687    /* unreference buffers (frees wrapped user-space buffer objects) */
 688    for (attr = 0; attr < num_vbuffers; attr++) {
 689       pipe_buffer_reference(&vbuffer[attr].buffer, NULL);
 690       assert(!vbuffer[attr].buffer);
 691    }
 692
 693    if (userSpace)
 694    {
 695       pipe->set_vertex_buffers(pipe, 0, NULL);
 696    }
 697 }
 698
 699
 700 void st_init_draw( struct st_context *st )
 701 {
 702    GLcontext *ctx = st->ctx;
 703
 704    vbo_set_draw_func(ctx, st_draw_vbo);
 705 }
 706
 707
 708 void st_destroy_draw( struct st_context *st )
 709 {
 710 }
 711
 712