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 "pipe/p_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  * If edge flags are needed, setup an bitvector of flags and call
 222  * pipe->set_edgeflags().
 223  * XXX memleak: need to free the returned pointer at some point
 224  */
 225 static void *
 226 setup_edgeflags(GLcontext *ctx, GLenum primMode, GLint start, GLint count,
 227                 const struct gl_client_array *array)
 228 {
 229    struct pipe_context *pipe = ctx->st->pipe;
 230
 231    if ((primMode == GL_TRIANGLES ||
 232         primMode == GL_QUADS ||
 233         primMode == GL_POLYGON) &&
 234        (ctx->Polygon.FrontMode != GL_FILL ||
 235         ctx->Polygon.BackMode != GL_FILL)) {
 236       /* need edge flags */
 237       GLint i;
 238       unsigned *vec;
 239       struct st_buffer_object *stobj = st_buffer_object(array->BufferObj);
 240       ubyte *map;
 241
 242       if (!stobj || stobj->Base.Name == 0) {
 243          /* edge flags are not in a VBO */
 244          return NULL;
 245       }
 246
 247       vec = (unsigned *) _mesa_calloc(sizeof(unsigned) * ((count + 31) / 32));
 248       if (!vec)
 249          return NULL;
 250
 251       map = pipe_buffer_map(pipe->screen, stobj->buffer, PIPE_BUFFER_USAGE_CPU_READ);
 252       map = ADD_POINTERS(map, array->Ptr);
 253
 254       for (i = 0; i < count; i++) {
 255          if (*((float *) map))
 256             vec[i/32] |= 1 << (i % 32);
 257
 258          map += array->StrideB;
 259       }
 260
 261       pipe_buffer_unmap(pipe->screen, stobj->buffer);
 262
 263       pipe->set_edgeflags(pipe, vec);
 264
 265       return vec;
 266    }
 267    else {
 268       /* edge flags not needed */
 269       pipe->set_edgeflags(pipe, NULL);
 270       return NULL;
 271    }
 272 }
 273
 274
 275 /**
 276  * Examine the active arrays to determine if we have interleaved
 277  * vertex arrays all living in one VBO, or all living in user space.
 278  * \param userSpace  returns whether the arrays are in user space.
 279  */
 280 static GLboolean
 281 is_interleaved_arrays(const struct st_vertex_program *vp,
 282                       const struct gl_client_array **arrays,
 283                       GLboolean *userSpace)
 284 {
 285    GLuint attr;
 286    const struct gl_buffer_object *firstBufObj = NULL;
 287    GLint firstStride = -1;
 288    GLuint num_client_arrays = 0;
 289    const GLubyte *client_addr = NULL;
 290
 291    for (attr = 0; attr < vp->num_inputs; attr++) {
 292       const GLuint mesaAttr = vp->index_to_input[attr];
 293       const struct gl_buffer_object *bufObj = arrays[mesaAttr]->BufferObj;
 294       const GLsizei stride = arrays[mesaAttr]->StrideB; /* in bytes */
 295
 296       if (firstStride < 0) {
 297          firstStride = stride;
 298       }
 299       else if (firstStride != stride) {
 300          return GL_FALSE;
 301       }
 302
 303       if (!bufObj || !bufObj->Name) {
 304          num_client_arrays++;
 305          /* Try to detect if the client-space arrays are
 306           * "close" to each other.
 307           */
 308          if (!client_addr) {
 309             client_addr = arrays[mesaAttr]->Ptr;
 310          }
 311          else if (abs(arrays[mesaAttr]->Ptr - client_addr) > firstStride) {
 312             /* arrays start too far apart */
 313             return GL_FALSE;
 314          }
 315       }
 316       else if (!firstBufObj) {
 317          firstBufObj = bufObj;
 318       }
 319       else if (bufObj != firstBufObj) {
 320          return GL_FALSE;
 321       }
 322    }
 323
 324    *userSpace = (num_client_arrays == vp->num_inputs);
 325    /* printf("user space: %d (%d %d)\n", (int) *userSpace,num_client_arrays,vp->num_inputs); */
 326
 327    return GL_TRUE;
 328 }
 329
 330
 331 /**
 332  * Compute the memory range occupied by the arrays.
 333  */
 334 static void
 335 get_arrays_bounds(const struct st_vertex_program *vp,
 336                        const struct gl_client_array **arrays,
 337                        GLuint max_index,
 338                        const GLubyte **low, const GLubyte **high)
 339 {
 340    const GLubyte *low_addr = NULL;
 341    const GLubyte *high_addr = NULL;
 342    GLuint attr;
 343
 344    for (attr = 0; attr < vp->num_inputs; attr++) {
 345       const GLuint mesaAttr = vp->index_to_input[attr];
 346       const GLint stride = arrays[mesaAttr]->StrideB;
 347       const GLubyte *start = arrays[mesaAttr]->Ptr;
 348       const unsigned sz = (arrays[mesaAttr]->Size *
 349                            _mesa_sizeof_type(arrays[mesaAttr]->Type));
 350       const GLubyte *end = start + (max_index * stride) + sz;
 351
 352       if (attr == 0) {
 353          low_addr = start;
 354          high_addr = end;
 355       }
 356       else {
 357          low_addr = MIN2(low_addr, start);
 358          high_addr = MAX2(high_addr, end);
 359       }
 360    }
 361
 362    *low = low_addr;
 363    *high = high_addr;
 364 }
 365
 366
 367 /**
 368  * Set up for drawing interleaved arrays that all live in one VBO
 369  * or all live in user space.
 370  * \param vbuffer  returns vertex buffer info
 371  * \param velements  returns vertex element info
 372  */
 373 static void
 374 setup_interleaved_attribs(GLcontext *ctx,
 375                           const struct st_vertex_program *vp,
 376                           const struct gl_client_array **arrays,
 377                           GLuint max_index,
 378                           GLboolean userSpace,
 379                           struct pipe_vertex_buffer *vbuffer,
 380                           struct pipe_vertex_element velements[])
 381 {
 382    struct pipe_context *pipe = ctx->st->pipe;
 383    GLuint attr;
 384    const GLubyte *offset0 = NULL;
 385
 386    for (attr = 0; attr < vp->num_inputs; attr++) {
 387       const GLuint mesaAttr = vp->index_to_input[attr];
 388       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 389       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 390       GLsizei stride = arrays[mesaAttr]->StrideB;
 391
 392       /*printf("stobj %u = %p\n", attr, (void*)stobj);*/
 393
 394       if (attr == 0) {
 395          const GLubyte *low, *high;
 396
 397          get_arrays_bounds(vp, arrays, max_index, &low, &high);
 398          /*printf("buffer range: %p %p  %d\n", low, high, high-low);*/
 399
 400          offset0 = low;
 401          if (userSpace) {
 402             vbuffer->buffer =
 403                pipe_user_buffer_create(pipe->screen, (void *) low, high - low);
 404             vbuffer->buffer_offset = 0;
 405          }
 406          else {
 407             vbuffer->buffer = NULL;
 408             pipe_buffer_reference(&vbuffer->buffer, stobj->buffer);
 409             vbuffer->buffer_offset = pointer_to_offset(low);
 410          }
 411          vbuffer->stride = stride; /* in bytes */
 412          vbuffer->max_index = max_index;
 413       }
 414
 415       velements[attr].src_offset =
 416          (unsigned) (arrays[mesaAttr]->Ptr - offset0);
 417       velements[attr].vertex_buffer_index = 0;
 418       velements[attr].nr_components = arrays[mesaAttr]->Size;
 419       velements[attr].src_format =
 420          st_pipe_vertex_format(arrays[mesaAttr]->Type,
 421                                arrays[mesaAttr]->Size,
 422                                arrays[mesaAttr]->Format,
 423                                arrays[mesaAttr]->Normalized);
 424       assert(velements[attr].src_format);
 425    }
 426 }
 427
 428
 429 /**
 430  * Set up a separate pipe_vertex_buffer and pipe_vertex_element for each
 431  * vertex attribute.
 432  * \param vbuffer  returns vertex buffer info
 433  * \param velements  returns vertex element info
 434  */
 435 static void
 436 setup_non_interleaved_attribs(GLcontext *ctx,
 437                               const struct st_vertex_program *vp,
 438                               const struct gl_client_array **arrays,
 439                               GLuint max_index,
 440                               GLboolean *userSpace,
 441                               struct pipe_vertex_buffer vbuffer[],
 442                               struct pipe_vertex_element velements[])
 443 {
 444    struct pipe_context *pipe = ctx->st->pipe;
 445    GLuint attr;
 446
 447    for (attr = 0; attr < vp->num_inputs; attr++) {
 448       const GLuint mesaAttr = vp->index_to_input[attr];
 449       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 450       GLsizei stride = arrays[mesaAttr]->StrideB;
 451
 452       *userSpace = GL_FALSE;
 453
 454       if (bufobj && bufobj->Name) {
 455          /* Attribute data is in a VBO.
 456           * Recall that for VBOs, the gl_client_array->Ptr field is
 457           * really an offset from the start of the VBO, not a pointer.
 458           */
 459          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 460          assert(stobj->buffer);
 461          /*printf("stobj %u = %p\n", attr, (void*) stobj);*/
 462
 463          vbuffer[attr].buffer = NULL;
 464          pipe_buffer_reference(&vbuffer[attr].buffer, stobj->buffer);
 465          vbuffer[attr].buffer_offset = pointer_to_offset(arrays[mesaAttr]->Ptr);
 466          velements[attr].src_offset = 0;
 467       }
 468       else {
 469          /* attribute data is in user-space memory, not a VBO */
 470          uint bytes;
 471          /*printf("user-space array %d stride %d\n", attr, stride);*/
 472
 473          *userSpace = GL_TRUE;
 474
 475          /* wrap user data */
 476          if (arrays[mesaAttr]->Ptr) {
 477             /* user's vertex array */
 478             if (arrays[mesaAttr]->StrideB) {
 479                bytes = arrays[mesaAttr]->StrideB * (max_index + 1);
 480             }
 481             else {
 482                bytes = arrays[mesaAttr]->Size
 483                   * _mesa_sizeof_type(arrays[mesaAttr]->Type);
 484             }
 485             vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
 486                            (void *) arrays[mesaAttr]->Ptr, bytes);
 487          }
 488          else {
 489             /* no array, use ctx->Current.Attrib[] value */
 490             bytes = sizeof(ctx->Current.Attrib[0]);
 491             vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
 492                            (void *) ctx->Current.Attrib[mesaAttr], bytes);
 493             stride = 0;
 494          }
 495
 496          vbuffer[attr].buffer_offset = 0;
 497          velements[attr].src_offset = 0;
 498       }
 499
 500       assert(velements[attr].src_offset <= 2048); /* 11-bit field */
 501
 502       /* common-case setup */
 503       vbuffer[attr].stride = stride; /* in bytes */
 504       vbuffer[attr].max_index = max_index;
 505       velements[attr].vertex_buffer_index = attr;
 506       velements[attr].nr_components = arrays[mesaAttr]->Size;
 507       velements[attr].src_format
 508          = st_pipe_vertex_format(arrays[mesaAttr]->Type,
 509                                  arrays[mesaAttr]->Size,
 510                                  arrays[mesaAttr]->Format,
 511                                  arrays[mesaAttr]->Normalized);
 512       assert(velements[attr].src_format);
 513    }
 514 }
 515
 516
 517
 518 /**
 519  * Prior to drawing, check that any uniforms referenced by the
 520  * current shader have been set.  If a uniform has not been set,
 521  * issue a warning.
 522  */
 523 static void
 524 check_uniforms(GLcontext *ctx)
 525 {
 526    const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
 527    if (shProg && shProg->LinkStatus) {
 528       GLuint i;
 529       for (i = 0; i < shProg->Uniforms->NumUniforms; i++) {
 530          const struct gl_uniform *u = &shProg->Uniforms->Uniforms[i];
 531          if (!u->Initialized) {
 532             _mesa_warning(ctx,
 533                           "Using shader with uninitialized uniform: %s",
 534                           u->Name);
 535          }
 536       }
 537    }
 538 }
 539
 540
 541 /**
 542  * This function gets plugged into the VBO module and is called when
 543  * we have something to render.
 544  * Basically, translate the information into the format expected by gallium.
 545  */
 546 void
 547 st_draw_vbo(GLcontext *ctx,
 548             const struct gl_client_array **arrays,
 549             const struct _mesa_prim *prims,
 550             GLuint nr_prims,
 551             const struct _mesa_index_buffer *ib,
 552             GLboolean index_bounds_valid,
 553             GLuint min_index,
 554             GLuint max_index)
 555 {
 556    struct pipe_context *pipe = ctx->st->pipe;
 557    const struct st_vertex_program *vp;
 558    const struct pipe_shader_state *vs;
 559    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 560    GLuint attr;
 561    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 562    unsigned num_vbuffers, num_velements;
 563    GLboolean userSpace = GL_FALSE;
 564
 565    /* Gallium probably doesn't want this in some cases. */
 566    if (!index_bounds_valid)
 567       vbo_get_minmax_index(ctx, prims, ib, &min_index, &max_index);
 568
 569    /* sanity check for pointer arithmetic below */
 570    assert(sizeof(arrays[0]->Ptr[0]) == 1);
 571
 572    st_validate_state(ctx->st);
 573
 574    /* must get these after state validation! */
 575    vp = ctx->st->vp;
 576    vs = &ctx->st->vp->state;
 577
 578 #if 0
 579    if (MESA_VERBOSE & VERBOSE_GLSL) {
 580       check_uniforms(ctx);
 581    }
 582 #else
 583    (void) check_uniforms;
 584 #endif
 585
 586    /*
 587     * Setup the vbuffer[] and velements[] arrays.
 588     */
 589    if (is_interleaved_arrays(vp, arrays, &userSpace)) {
 590       /*printf("Draw interleaved\n");*/
 591       setup_interleaved_attribs(ctx, vp, arrays, max_index, userSpace,
 592                                 vbuffer, velements);
 593       num_vbuffers = 1;
 594       num_velements = vp->num_inputs;
 595       if (num_velements == 0)
 596          num_vbuffers = 0;
 597    }
 598    else {
 599       /*printf("Draw non-interleaved\n");*/
 600       setup_non_interleaved_attribs(ctx, vp, arrays, max_index,
 601                                     &userSpace, vbuffer, velements);
 602       num_vbuffers = vp->num_inputs;
 603       num_velements = vp->num_inputs;
 604    }
 605
 606 #if 0
 607    {
 608       GLuint i;
 609       for (i = 0; i < num_vbuffers; i++) {
 610          printf("buffers[%d].stride = %u\n", i, vbuffer[i].stride);
 611          printf("buffers[%d].max_index = %u\n", i, vbuffer[i].max_index);
 612          printf("buffers[%d].buffer_offset = %u\n", i, vbuffer[i].buffer_offset);
 613          printf("buffers[%d].buffer = %p\n", i, (void*) vbuffer[i].buffer);
 614       }
 615       for (i = 0; i < num_velements; i++) {
 616          printf("vlements[%d].vbuffer_index = %u\n", i, velements[i].vertex_buffer_index);
 617          printf("vlements[%d].src_offset = %u\n", i, velements[i].src_offset);
 618          printf("vlements[%d].nr_comps = %u\n", i, velements[i].nr_components);
 619          printf("vlements[%d].format = %s\n", i, pf_name(velements[i].src_format));
 620       }
 621    }
 622 #endif
 623
 624    pipe->set_vertex_buffers(pipe, num_vbuffers, vbuffer);
 625    pipe->set_vertex_elements(pipe, num_velements, velements);
 626
 627    if (num_vbuffers == 0 || num_velements == 0)
 628       return;
 629
 630    /* do actual drawing */
 631    if (ib) {
 632       /* indexed primitive */
 633       struct gl_buffer_object *bufobj = ib->obj;
 634       struct pipe_buffer *indexBuf = NULL;
 635       unsigned indexSize, indexOffset, i;
 636
 637       switch (ib->type) {
 638       case GL_UNSIGNED_INT:
 639          indexSize = 4;
 640          break;
 641       case GL_UNSIGNED_SHORT:
 642          indexSize = 2;
 643          break;
 644       case GL_UNSIGNED_BYTE:
 645          indexSize = 1;
 646          break;
 647       default:
 648          assert(0);
 649          return;
 650       }
 651
 652       /* get/create the index buffer object */
 653       if (bufobj && bufobj->Name) {
 654          /* elements/indexes are in a real VBO */
 655          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 656          pipe_buffer_reference(&indexBuf, stobj->buffer);
 657          indexOffset = pointer_to_offset(ib->ptr) / indexSize;
 658       }
 659       else {
 660          /* element/indicies are in user space memory */
 661          indexBuf = pipe_user_buffer_create(pipe->screen, (void *) ib->ptr,
 662                                             ib->count * indexSize);
 663          indexOffset = 0;
 664       }
 665
 666       /* draw */
 667       if (nr_prims == 1 && pipe->draw_range_elements != NULL) {
 668          i = 0;
 669
 670          /* XXX: exercise temporary path to pass min/max directly
 671           * through to driver & draw module.  These interfaces still
 672           * need a bit of work...
 673           */
 674          setup_edgeflags(ctx, prims[i].mode,
 675                          prims[i].start + indexOffset, prims[i].count,
 676                          arrays[VERT_ATTRIB_EDGEFLAG]);
 677
 678          pipe->draw_range_elements(pipe, indexBuf, indexSize,
 679                                    min_index,
 680                                    max_index,
 681                                    prims[i].mode,
 682                                    prims[i].start + indexOffset, prims[i].count);
 683       }
 684       else {
 685          for (i = 0; i < nr_prims; i++) {
 686             setup_edgeflags(ctx, prims[i].mode,
 687                             prims[i].start + indexOffset, prims[i].count,
 688                             arrays[VERT_ATTRIB_EDGEFLAG]);
 689
 690             pipe->draw_elements(pipe, indexBuf, indexSize,
 691                                 prims[i].mode,
 692                                 prims[i].start + indexOffset, prims[i].count);
 693          }
 694       }
 695
 696       pipe_buffer_reference(&indexBuf, NULL);
 697    }
 698    else {
 699       /* non-indexed */
 700       GLuint i;
 701       for (i = 0; i < nr_prims; i++) {
 702          setup_edgeflags(ctx, prims[i].mode,
 703                          prims[i].start, prims[i].count,
 704                          arrays[VERT_ATTRIB_EDGEFLAG]);
 705
 706          pipe->draw_arrays(pipe, prims[i].mode, prims[i].start, prims[i].count);
 707       }
 708    }
 709
 710    /* unreference buffers (frees wrapped user-space buffer objects) */
 711    for (attr = 0; attr < num_vbuffers; attr++) {
 712       pipe_buffer_reference(&vbuffer[attr].buffer, NULL);
 713       assert(!vbuffer[attr].buffer);
 714    }
 715
 716    if (userSpace)
 717    {
 718       pipe->set_vertex_buffers(pipe, 0, NULL);
 719    }
 720 }
 721
 722
 723 void st_init_draw( struct st_context *st )
 724 {
 725    GLcontext *ctx = st->ctx;
 726
 727    vbo_set_draw_func(ctx, st_draw_vbo);
 728 }
 729
 730
 731 void st_destroy_draw( struct st_context *st )
 732 {
 733 }
 734
 735