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 #include "util/u_format.h"
  60
  61
  62 static GLuint double_types[4] = {
  63    PIPE_FORMAT_R64_FLOAT,
  64    PIPE_FORMAT_R64G64_FLOAT,
  65    PIPE_FORMAT_R64G64B64_FLOAT,
  66    PIPE_FORMAT_R64G64B64A64_FLOAT
  67 };
  68
  69 static GLuint float_types[4] = {
  70    PIPE_FORMAT_R32_FLOAT,
  71    PIPE_FORMAT_R32G32_FLOAT,
  72    PIPE_FORMAT_R32G32B32_FLOAT,
  73    PIPE_FORMAT_R32G32B32A32_FLOAT
  74 };
  75
  76 static GLuint uint_types_norm[4] = {
  77    PIPE_FORMAT_R32_UNORM,
  78    PIPE_FORMAT_R32G32_UNORM,
  79    PIPE_FORMAT_R32G32B32_UNORM,
  80    PIPE_FORMAT_R32G32B32A32_UNORM
  81 };
  82
  83 static GLuint uint_types_scale[4] = {
  84    PIPE_FORMAT_R32_USCALED,
  85    PIPE_FORMAT_R32G32_USCALED,
  86    PIPE_FORMAT_R32G32B32_USCALED,
  87    PIPE_FORMAT_R32G32B32A32_USCALED
  88 };
  89
  90 static GLuint int_types_norm[4] = {
  91    PIPE_FORMAT_R32_SNORM,
  92    PIPE_FORMAT_R32G32_SNORM,
  93    PIPE_FORMAT_R32G32B32_SNORM,
  94    PIPE_FORMAT_R32G32B32A32_SNORM
  95 };
  96
  97 static GLuint int_types_scale[4] = {
  98    PIPE_FORMAT_R32_SSCALED,
  99    PIPE_FORMAT_R32G32_SSCALED,
 100    PIPE_FORMAT_R32G32B32_SSCALED,
 101    PIPE_FORMAT_R32G32B32A32_SSCALED
 102 };
 103
 104 static GLuint ushort_types_norm[4] = {
 105    PIPE_FORMAT_R16_UNORM,
 106    PIPE_FORMAT_R16G16_UNORM,
 107    PIPE_FORMAT_R16G16B16_UNORM,
 108    PIPE_FORMAT_R16G16B16A16_UNORM
 109 };
 110
 111 static GLuint ushort_types_scale[4] = {
 112    PIPE_FORMAT_R16_USCALED,
 113    PIPE_FORMAT_R16G16_USCALED,
 114    PIPE_FORMAT_R16G16B16_USCALED,
 115    PIPE_FORMAT_R16G16B16A16_USCALED
 116 };
 117
 118 static GLuint short_types_norm[4] = {
 119    PIPE_FORMAT_R16_SNORM,
 120    PIPE_FORMAT_R16G16_SNORM,
 121    PIPE_FORMAT_R16G16B16_SNORM,
 122    PIPE_FORMAT_R16G16B16A16_SNORM
 123 };
 124
 125 static GLuint short_types_scale[4] = {
 126    PIPE_FORMAT_R16_SSCALED,
 127    PIPE_FORMAT_R16G16_SSCALED,
 128    PIPE_FORMAT_R16G16B16_SSCALED,
 129    PIPE_FORMAT_R16G16B16A16_SSCALED
 130 };
 131
 132 static GLuint ubyte_types_norm[4] = {
 133    PIPE_FORMAT_R8_UNORM,
 134    PIPE_FORMAT_R8G8_UNORM,
 135    PIPE_FORMAT_R8G8B8_UNORM,
 136    PIPE_FORMAT_R8G8B8A8_UNORM
 137 };
 138
 139 static GLuint ubyte_types_scale[4] = {
 140    PIPE_FORMAT_R8_USCALED,
 141    PIPE_FORMAT_R8G8_USCALED,
 142    PIPE_FORMAT_R8G8B8_USCALED,
 143    PIPE_FORMAT_R8G8B8A8_USCALED
 144 };
 145
 146 static GLuint byte_types_norm[4] = {
 147    PIPE_FORMAT_R8_SNORM,
 148    PIPE_FORMAT_R8G8_SNORM,
 149    PIPE_FORMAT_R8G8B8_SNORM,
 150    PIPE_FORMAT_R8G8B8A8_SNORM
 151 };
 152
 153 static GLuint byte_types_scale[4] = {
 154    PIPE_FORMAT_R8_SSCALED,
 155    PIPE_FORMAT_R8G8_SSCALED,
 156    PIPE_FORMAT_R8G8B8_SSCALED,
 157    PIPE_FORMAT_R8G8B8A8_SSCALED
 158 };
 159
 160 static GLuint fixed_types[4] = {
 161    PIPE_FORMAT_R32_FIXED,
 162    PIPE_FORMAT_R32G32_FIXED,
 163    PIPE_FORMAT_R32G32B32_FIXED,
 164    PIPE_FORMAT_R32G32B32A32_FIXED
 165 };
 166
 167
 168
 169 /**
 170  * Return a PIPE_FORMAT_x for the given GL datatype and size.
 171  */
 172 GLuint
 173 st_pipe_vertex_format(GLenum type, GLuint size, GLenum format,
 174                       GLboolean normalized)
 175 {
 176    assert((type >= GL_BYTE && type <= GL_DOUBLE) ||
 177           type == GL_FIXED);
 178    assert(size >= 1);
 179    assert(size <= 4);
 180    assert(format == GL_RGBA || format == GL_BGRA);
 181
 182    if (format == GL_BGRA) {
 183       /* this is an odd-ball case */
 184       assert(type == GL_UNSIGNED_BYTE);
 185       assert(normalized);
 186       return PIPE_FORMAT_A8R8G8B8_UNORM;
 187    }
 188
 189    if (normalized) {
 190       switch (type) {
 191       case GL_DOUBLE: return double_types[size-1];
 192       case GL_FLOAT: return float_types[size-1];
 193       case GL_INT: return int_types_norm[size-1];
 194       case GL_SHORT: return short_types_norm[size-1];
 195       case GL_BYTE: return byte_types_norm[size-1];
 196       case GL_UNSIGNED_INT: return uint_types_norm[size-1];
 197       case GL_UNSIGNED_SHORT: return ushort_types_norm[size-1];
 198       case GL_UNSIGNED_BYTE: return ubyte_types_norm[size-1];
 199       case GL_FIXED: return fixed_types[size-1];
 200       default: assert(0); return 0;
 201       }
 202    }
 203    else {
 204       switch (type) {
 205       case GL_DOUBLE: return double_types[size-1];
 206       case GL_FLOAT: return float_types[size-1];
 207       case GL_INT: return int_types_scale[size-1];
 208       case GL_SHORT: return short_types_scale[size-1];
 209       case GL_BYTE: return byte_types_scale[size-1];
 210       case GL_UNSIGNED_INT: return uint_types_scale[size-1];
 211       case GL_UNSIGNED_SHORT: return ushort_types_scale[size-1];
 212       case GL_UNSIGNED_BYTE: return ubyte_types_scale[size-1];
 213       case GL_FIXED: return fixed_types[size-1];
 214       default: assert(0); return 0;
 215       }
 216    }
 217    return 0; /* silence compiler warning */
 218 }
 219
 220
 221
 222
 223
 224 /**
 225  * Examine the active arrays to determine if we have interleaved
 226  * vertex arrays all living in one VBO, or all living in user space.
 227  * \param userSpace  returns whether the arrays are in user space.
 228  */
 229 static GLboolean
 230 is_interleaved_arrays(const struct st_vertex_program *vp,
 231                       const struct st_vp_varient *vpv,
 232                       const struct gl_client_array **arrays,
 233                       GLboolean *userSpace)
 234 {
 235    GLuint attr;
 236    const struct gl_buffer_object *firstBufObj = NULL;
 237    GLint firstStride = -1;
 238    GLuint num_client_arrays = 0;
 239    const GLubyte *client_addr = NULL;
 240
 241    for (attr = 0; attr < vpv->num_inputs; attr++) {
 242       const GLuint mesaAttr = vp->index_to_input[attr];
 243       const struct gl_buffer_object *bufObj = arrays[mesaAttr]->BufferObj;
 244       const GLsizei stride = arrays[mesaAttr]->StrideB; /* in bytes */
 245
 246       if (firstStride < 0) {
 247          firstStride = stride;
 248       }
 249       else if (firstStride != stride) {
 250          return GL_FALSE;
 251       }
 252
 253       if (!bufObj || !bufObj->Name) {
 254          num_client_arrays++;
 255          /* Try to detect if the client-space arrays are
 256           * "close" to each other.
 257           */
 258          if (!client_addr) {
 259             client_addr = arrays[mesaAttr]->Ptr;
 260          }
 261          else if (abs(arrays[mesaAttr]->Ptr - client_addr) > firstStride) {
 262             /* arrays start too far apart */
 263             return GL_FALSE;
 264          }
 265       }
 266       else if (!firstBufObj) {
 267          firstBufObj = bufObj;
 268       }
 269       else if (bufObj != firstBufObj) {
 270          return GL_FALSE;
 271       }
 272    }
 273
 274    *userSpace = (num_client_arrays == vpv->num_inputs);
 275    /* printf("user space: %d (%d %d)\n", (int) *userSpace,num_client_arrays,vp->num_inputs); */
 276
 277    return GL_TRUE;
 278 }
 279
 280
 281 /**
 282  * Compute the memory range occupied by the arrays.
 283  */
 284 static void
 285 get_arrays_bounds(const struct st_vertex_program *vp,
 286                   const struct st_vp_varient *vpv,
 287                   const struct gl_client_array **arrays,
 288                   GLuint max_index,
 289                   const GLubyte **low, const GLubyte **high)
 290 {
 291    const GLubyte *low_addr = NULL;
 292    const GLubyte *high_addr = NULL;
 293    GLuint attr;
 294
 295    for (attr = 0; attr < vpv->num_inputs; attr++) {
 296       const GLuint mesaAttr = vp->index_to_input[attr];
 297       const GLint stride = arrays[mesaAttr]->StrideB;
 298       const GLubyte *start = arrays[mesaAttr]->Ptr;
 299       const unsigned sz = (arrays[mesaAttr]->Size *
 300                            _mesa_sizeof_type(arrays[mesaAttr]->Type));
 301       const GLubyte *end = start + (max_index * stride) + sz;
 302
 303       if (attr == 0) {
 304          low_addr = start;
 305          high_addr = end;
 306       }
 307       else {
 308          low_addr = MIN2(low_addr, start);
 309          high_addr = MAX2(high_addr, end);
 310       }
 311    }
 312
 313    *low = low_addr;
 314    *high = high_addr;
 315 }
 316
 317
 318 /**
 319  * Set up for drawing interleaved arrays that all live in one VBO
 320  * or all live in user space.
 321  * \param vbuffer  returns vertex buffer info
 322  * \param velements  returns vertex element info
 323  */
 324 static void
 325 setup_interleaved_attribs(GLcontext *ctx,
 326                           const struct st_vertex_program *vp,
 327                           const struct st_vp_varient *vpv,
 328                           const struct gl_client_array **arrays,
 329                           GLuint max_index,
 330                           GLboolean userSpace,
 331                           struct pipe_vertex_buffer *vbuffer,
 332                           struct pipe_vertex_element velements[])
 333 {
 334    struct pipe_context *pipe = ctx->st->pipe;
 335    GLuint attr;
 336    const GLubyte *offset0 = NULL;
 337
 338    for (attr = 0; attr < vpv->num_inputs; attr++) {
 339       const GLuint mesaAttr = vp->index_to_input[attr];
 340       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 341       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 342       GLsizei stride = arrays[mesaAttr]->StrideB;
 343
 344       /*printf("stobj %u = %p\n", attr, (void*)stobj);*/
 345
 346       if (attr == 0) {
 347          const GLubyte *low, *high;
 348
 349          get_arrays_bounds(vp, vpv, arrays, max_index, &low, &high);
 350          /*printf("buffer range: %p %p  %d\n", low, high, high-low);*/
 351
 352          offset0 = low;
 353          if (userSpace) {
 354             vbuffer->buffer =
 355                pipe_user_buffer_create(pipe->screen, (void *) low, high - low);
 356             vbuffer->buffer_offset = 0;
 357          }
 358          else {
 359             vbuffer->buffer = NULL;
 360             pipe_buffer_reference(&vbuffer->buffer, stobj->buffer);
 361             vbuffer->buffer_offset = pointer_to_offset(low);
 362          }
 363          vbuffer->stride = stride; /* in bytes */
 364          vbuffer->max_index = max_index;
 365       }
 366
 367       velements[attr].src_offset =
 368          (unsigned) (arrays[mesaAttr]->Ptr - offset0);
 369       velements[attr].instance_divisor = 0;
 370       velements[attr].vertex_buffer_index = 0;
 371       velements[attr].nr_components = arrays[mesaAttr]->Size;
 372       velements[attr].src_format =
 373          st_pipe_vertex_format(arrays[mesaAttr]->Type,
 374                                arrays[mesaAttr]->Size,
 375                                arrays[mesaAttr]->Format,
 376                                arrays[mesaAttr]->Normalized);
 377       assert(velements[attr].src_format);
 378    }
 379 }
 380
 381
 382 /**
 383  * Set up a separate pipe_vertex_buffer and pipe_vertex_element for each
 384  * vertex attribute.
 385  * \param vbuffer  returns vertex buffer info
 386  * \param velements  returns vertex element info
 387  */
 388 static void
 389 setup_non_interleaved_attribs(GLcontext *ctx,
 390                               const struct st_vertex_program *vp,
 391                               const struct st_vp_varient *vpv,
 392                               const struct gl_client_array **arrays,
 393                               GLuint max_index,
 394                               GLboolean *userSpace,
 395                               struct pipe_vertex_buffer vbuffer[],
 396                               struct pipe_vertex_element velements[])
 397 {
 398    struct pipe_context *pipe = ctx->st->pipe;
 399    GLuint attr;
 400
 401    for (attr = 0; attr < vpv->num_inputs; attr++) {
 402       const GLuint mesaAttr = vp->index_to_input[attr];
 403       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 404       GLsizei stride = arrays[mesaAttr]->StrideB;
 405
 406       *userSpace = GL_FALSE;
 407
 408       if (bufobj && bufobj->Name) {
 409          /* Attribute data is in a VBO.
 410           * Recall that for VBOs, the gl_client_array->Ptr field is
 411           * really an offset from the start of the VBO, not a pointer.
 412           */
 413          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 414          assert(stobj->buffer);
 415          /*printf("stobj %u = %p\n", attr, (void*) stobj);*/
 416
 417          vbuffer[attr].buffer = NULL;
 418          pipe_buffer_reference(&vbuffer[attr].buffer, stobj->buffer);
 419          vbuffer[attr].buffer_offset = pointer_to_offset(arrays[mesaAttr]->Ptr);
 420          velements[attr].src_offset = 0;
 421       }
 422       else {
 423          /* attribute data is in user-space memory, not a VBO */
 424          uint bytes;
 425          /*printf("user-space array %d stride %d\n", attr, stride);*/
 426
 427          *userSpace = GL_TRUE;
 428
 429          /* wrap user data */
 430          if (arrays[mesaAttr]->Ptr) {
 431             /* user's vertex array */
 432             if (arrays[mesaAttr]->StrideB) {
 433                bytes = arrays[mesaAttr]->StrideB * (max_index + 1);
 434             }
 435             else {
 436                bytes = arrays[mesaAttr]->Size
 437                   * _mesa_sizeof_type(arrays[mesaAttr]->Type);
 438             }
 439             vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
 440                            (void *) arrays[mesaAttr]->Ptr, bytes);
 441          }
 442          else {
 443             /* no array, use ctx->Current.Attrib[] value */
 444             bytes = sizeof(ctx->Current.Attrib[0]);
 445             vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
 446                            (void *) ctx->Current.Attrib[mesaAttr], bytes);
 447             stride = 0;
 448          }
 449
 450          vbuffer[attr].buffer_offset = 0;
 451          velements[attr].src_offset = 0;
 452       }
 453
 454       assert(velements[attr].src_offset <= 2048); /* 11-bit field */
 455
 456       /* common-case setup */
 457       vbuffer[attr].stride = stride; /* in bytes */
 458       vbuffer[attr].max_index = max_index;
 459       velements[attr].instance_divisor = 0;
 460       velements[attr].vertex_buffer_index = attr;
 461       velements[attr].nr_components = arrays[mesaAttr]->Size;
 462       velements[attr].src_format
 463          = st_pipe_vertex_format(arrays[mesaAttr]->Type,
 464                                  arrays[mesaAttr]->Size,
 465                                  arrays[mesaAttr]->Format,
 466                                  arrays[mesaAttr]->Normalized);
 467       assert(velements[attr].src_format);
 468    }
 469 }
 470
 471
 472
 473 /**
 474  * Prior to drawing, check that any uniforms referenced by the
 475  * current shader have been set.  If a uniform has not been set,
 476  * issue a warning.
 477  */
 478 static void
 479 check_uniforms(GLcontext *ctx)
 480 {
 481    const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
 482    if (shProg && shProg->LinkStatus) {
 483       GLuint i;
 484       for (i = 0; i < shProg->Uniforms->NumUniforms; i++) {
 485          const struct gl_uniform *u = &shProg->Uniforms->Uniforms[i];
 486          if (!u->Initialized) {
 487             _mesa_warning(ctx,
 488                           "Using shader with uninitialized uniform: %s",
 489                           u->Name);
 490          }
 491       }
 492    }
 493 }
 494
 495
 496 static unsigned translate_prim( GLcontext *ctx,
 497                                 unsigned prim )
 498 {
 499    /* Avoid quadstrips if it's easy to do so:
 500     */
 501    if (prim == GL_QUAD_STRIP &&
 502        ctx->Light.ShadeModel != GL_FLAT &&
 503        ctx->Polygon.FrontMode == GL_FILL &&
 504        ctx->Polygon.BackMode == GL_FILL)
 505       prim = GL_TRIANGLE_STRIP;
 506
 507    return prim;
 508 }
 509
 510 /**
 511  * This function gets plugged into the VBO module and is called when
 512  * we have something to render.
 513  * Basically, translate the information into the format expected by gallium.
 514  */
 515 void
 516 st_draw_vbo(GLcontext *ctx,
 517             const struct gl_client_array **arrays,
 518             const struct _mesa_prim *prims,
 519             GLuint nr_prims,
 520             const struct _mesa_index_buffer *ib,
 521             GLboolean index_bounds_valid,
 522             GLuint min_index,
 523             GLuint max_index)
 524 {
 525    struct pipe_context *pipe = ctx->st->pipe;
 526    const struct st_vertex_program *vp;
 527    const struct st_vp_varient *vpv;
 528    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 529    GLuint attr;
 530    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 531    unsigned num_vbuffers, num_velements;
 532    GLboolean userSpace = GL_FALSE;
 533    GLboolean vertDataEdgeFlags;
 534
 535    /* Mesa core state should have been validated already */
 536    assert(ctx->NewState == 0x0);
 537
 538    /* Gallium probably doesn't want this in some cases. */
 539    if (!index_bounds_valid)
 540       if (!vbo_all_varyings_in_vbos(arrays))
 541          vbo_get_minmax_index(ctx, prims, ib, &min_index, &max_index);
 542
 543    /* sanity check for pointer arithmetic below */
 544    assert(sizeof(arrays[0]->Ptr[0]) == 1);
 545
 546    vertDataEdgeFlags = arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj &&
 547                        arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj->Name;
 548    if (vertDataEdgeFlags != ctx->st->vertdata_edgeflags) {
 549       ctx->st->vertdata_edgeflags = vertDataEdgeFlags;
 550       ctx->st->dirty.st |= ST_NEW_EDGEFLAGS_DATA;
 551    }
 552
 553    st_validate_state(ctx->st);
 554
 555    /* must get these after state validation! */
 556    vp = ctx->st->vp;
 557    vpv = ctx->st->vp_varient;
 558
 559 #if 0
 560    if (MESA_VERBOSE & VERBOSE_GLSL) {
 561       check_uniforms(ctx);
 562    }
 563 #else
 564    (void) check_uniforms;
 565 #endif
 566
 567    /*
 568     * Setup the vbuffer[] and velements[] arrays.
 569     */
 570    if (is_interleaved_arrays(vp, vpv, arrays, &userSpace)) {
 571       /*printf("Draw interleaved\n");*/
 572       setup_interleaved_attribs(ctx, vp, vpv, arrays, max_index, userSpace,
 573                                 vbuffer, velements);
 574       num_vbuffers = 1;
 575       num_velements = vpv->num_inputs;
 576       if (num_velements == 0)
 577          num_vbuffers = 0;
 578    }
 579    else {
 580       /*printf("Draw non-interleaved\n");*/
 581       setup_non_interleaved_attribs(ctx, vp, vpv, arrays, max_index,
 582                                     &userSpace, vbuffer, velements);
 583       num_vbuffers = vpv->num_inputs;
 584       num_velements = vpv->num_inputs;
 585    }
 586
 587 #if 0
 588    {
 589       GLuint i;
 590       for (i = 0; i < num_vbuffers; i++) {
 591          printf("buffers[%d].stride = %u\n", i, vbuffer[i].stride);
 592          printf("buffers[%d].max_index = %u\n", i, vbuffer[i].max_index);
 593          printf("buffers[%d].buffer_offset = %u\n", i, vbuffer[i].buffer_offset);
 594          printf("buffers[%d].buffer = %p\n", i, (void*) vbuffer[i].buffer);
 595       }
 596       for (i = 0; i < num_velements; i++) {
 597          printf("vlements[%d].vbuffer_index = %u\n", i, velements[i].vertex_buffer_index);
 598          printf("vlements[%d].src_offset = %u\n", i, velements[i].src_offset);
 599          printf("vlements[%d].nr_comps = %u\n", i, velements[i].nr_components);
 600          printf("vlements[%d].format = %s\n", i, util_format_name(velements[i].src_format));
 601       }
 602    }
 603 #endif
 604
 605    pipe->set_vertex_buffers(pipe, num_vbuffers, vbuffer);
 606    pipe->set_vertex_elements(pipe, num_velements, velements);
 607
 608    if (num_vbuffers == 0 || num_velements == 0)
 609       return;
 610
 611    /* do actual drawing */
 612    if (ib) {
 613       /* indexed primitive */
 614       struct gl_buffer_object *bufobj = ib->obj;
 615       struct pipe_buffer *indexBuf = NULL;
 616       unsigned indexSize, indexOffset, i;
 617       unsigned prim;
 618
 619       switch (ib->type) {
 620       case GL_UNSIGNED_INT:
 621          indexSize = 4;
 622          break;
 623       case GL_UNSIGNED_SHORT:
 624          indexSize = 2;
 625          break;
 626       case GL_UNSIGNED_BYTE:
 627          indexSize = 1;
 628          break;
 629       default:
 630          assert(0);
 631          return;
 632       }
 633
 634       /* get/create the index buffer object */
 635       if (bufobj && bufobj->Name) {
 636          /* elements/indexes are in a real VBO */
 637          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 638          pipe_buffer_reference(&indexBuf, stobj->buffer);
 639          indexOffset = pointer_to_offset(ib->ptr) / indexSize;
 640       }
 641       else {
 642          /* element/indicies are in user space memory */
 643          indexBuf = pipe_user_buffer_create(pipe->screen, (void *) ib->ptr,
 644                                             ib->count * indexSize);
 645          indexOffset = 0;
 646       }
 647
 648       /* draw */
 649       if (pipe->draw_range_elements && min_index != ~0 && max_index != ~0) {
 650          /* XXX: exercise temporary path to pass min/max directly
 651           * through to driver & draw module.  These interfaces still
 652           * need a bit of work...
 653           */
 654          for (i = 0; i < nr_prims; i++) {
 655             prim = translate_prim( ctx, prims[i].mode );
 656
 657             pipe->draw_range_elements(pipe, indexBuf, indexSize,
 658                                       min_index, max_index, prim,
 659                                       prims[i].start + indexOffset, prims[i].count);
 660          }
 661       }
 662       else {
 663          for (i = 0; i < nr_prims; i++) {
 664             prim = translate_prim( ctx, prims[i].mode );
 665
 666             pipe->draw_elements(pipe, indexBuf, indexSize,
 667                                 prim,
 668                                 prims[i].start + indexOffset, prims[i].count);
 669          }
 670       }
 671
 672       pipe_buffer_reference(&indexBuf, NULL);
 673    }
 674    else {
 675       /* non-indexed */
 676       GLuint i;
 677       GLuint prim;
 678
 679       for (i = 0; i < nr_prims; i++) {
 680          prim = translate_prim( ctx, prims[i].mode );
 681
 682          pipe->draw_arrays(pipe, prim, prims[i].start, prims[i].count);
 683       }
 684    }
 685
 686    /* unreference buffers (frees wrapped user-space buffer objects) */
 687    for (attr = 0; attr < num_vbuffers; attr++) {
 688       pipe_buffer_reference(&vbuffer[attr].buffer, NULL);
 689       assert(!vbuffer[attr].buffer);
 690    }
 691
 692    if (userSpace)
 693    {
 694       pipe->set_vertex_buffers(pipe, 0, NULL);
 695    }
 696 }
 697
 698
 699 void st_init_draw( struct st_context *st )
 700 {
 701    GLcontext *ctx = st->ctx;
 702
 703    vbo_set_draw_func(ctx, st_draw_vbo);
 704 }
 705
 706
 707 void st_destroy_draw( struct st_context *st )
 708 {
 709 }
 710
 711