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/bufferobj.h"
  46 #include "main/macros.h"
  47 #include "main/mfeatures.h"
  48 #include "program/prog_uniform.h"
  49
  50 #include "vbo/vbo.h"
  51
  52 #include "st_context.h"
  53 #include "st_atom.h"
  54 #include "st_cb_bufferobjects.h"
  55 #include "st_draw.h"
  56 #include "st_program.h"
  57
  58 #include "pipe/p_context.h"
  59 #include "pipe/p_defines.h"
  60 #include "util/u_inlines.h"
  61 #include "util/u_format.h"
  62 #include "util/u_prim.h"
  63 #include "util/u_draw_quad.h"
  64 #include "draw/draw_context.h"
  65 #include "cso_cache/cso_context.h"
  66
  67
  68 static GLuint double_types[4] = {
  69    PIPE_FORMAT_R64_FLOAT,
  70    PIPE_FORMAT_R64G64_FLOAT,
  71    PIPE_FORMAT_R64G64B64_FLOAT,
  72    PIPE_FORMAT_R64G64B64A64_FLOAT
  73 };
  74
  75 static GLuint float_types[4] = {
  76    PIPE_FORMAT_R32_FLOAT,
  77    PIPE_FORMAT_R32G32_FLOAT,
  78    PIPE_FORMAT_R32G32B32_FLOAT,
  79    PIPE_FORMAT_R32G32B32A32_FLOAT
  80 };
  81
  82 static GLuint half_float_types[4] = {
  83    PIPE_FORMAT_R16_FLOAT,
  84    PIPE_FORMAT_R16G16_FLOAT,
  85    PIPE_FORMAT_R16G16B16_FLOAT,
  86    PIPE_FORMAT_R16G16B16A16_FLOAT
  87 };
  88
  89 static GLuint uint_types_norm[4] = {
  90    PIPE_FORMAT_R32_UNORM,
  91    PIPE_FORMAT_R32G32_UNORM,
  92    PIPE_FORMAT_R32G32B32_UNORM,
  93    PIPE_FORMAT_R32G32B32A32_UNORM
  94 };
  95
  96 static GLuint uint_types_scale[4] = {
  97    PIPE_FORMAT_R32_USCALED,
  98    PIPE_FORMAT_R32G32_USCALED,
  99    PIPE_FORMAT_R32G32B32_USCALED,
 100    PIPE_FORMAT_R32G32B32A32_USCALED
 101 };
 102
 103 static GLuint int_types_norm[4] = {
 104    PIPE_FORMAT_R32_SNORM,
 105    PIPE_FORMAT_R32G32_SNORM,
 106    PIPE_FORMAT_R32G32B32_SNORM,
 107    PIPE_FORMAT_R32G32B32A32_SNORM
 108 };
 109
 110 static GLuint int_types_scale[4] = {
 111    PIPE_FORMAT_R32_SSCALED,
 112    PIPE_FORMAT_R32G32_SSCALED,
 113    PIPE_FORMAT_R32G32B32_SSCALED,
 114    PIPE_FORMAT_R32G32B32A32_SSCALED
 115 };
 116
 117 static GLuint ushort_types_norm[4] = {
 118    PIPE_FORMAT_R16_UNORM,
 119    PIPE_FORMAT_R16G16_UNORM,
 120    PIPE_FORMAT_R16G16B16_UNORM,
 121    PIPE_FORMAT_R16G16B16A16_UNORM
 122 };
 123
 124 static GLuint ushort_types_scale[4] = {
 125    PIPE_FORMAT_R16_USCALED,
 126    PIPE_FORMAT_R16G16_USCALED,
 127    PIPE_FORMAT_R16G16B16_USCALED,
 128    PIPE_FORMAT_R16G16B16A16_USCALED
 129 };
 130
 131 static GLuint short_types_norm[4] = {
 132    PIPE_FORMAT_R16_SNORM,
 133    PIPE_FORMAT_R16G16_SNORM,
 134    PIPE_FORMAT_R16G16B16_SNORM,
 135    PIPE_FORMAT_R16G16B16A16_SNORM
 136 };
 137
 138 static GLuint short_types_scale[4] = {
 139    PIPE_FORMAT_R16_SSCALED,
 140    PIPE_FORMAT_R16G16_SSCALED,
 141    PIPE_FORMAT_R16G16B16_SSCALED,
 142    PIPE_FORMAT_R16G16B16A16_SSCALED
 143 };
 144
 145 static GLuint ubyte_types_norm[4] = {
 146    PIPE_FORMAT_R8_UNORM,
 147    PIPE_FORMAT_R8G8_UNORM,
 148    PIPE_FORMAT_R8G8B8_UNORM,
 149    PIPE_FORMAT_R8G8B8A8_UNORM
 150 };
 151
 152 static GLuint ubyte_types_scale[4] = {
 153    PIPE_FORMAT_R8_USCALED,
 154    PIPE_FORMAT_R8G8_USCALED,
 155    PIPE_FORMAT_R8G8B8_USCALED,
 156    PIPE_FORMAT_R8G8B8A8_USCALED
 157 };
 158
 159 static GLuint byte_types_norm[4] = {
 160    PIPE_FORMAT_R8_SNORM,
 161    PIPE_FORMAT_R8G8_SNORM,
 162    PIPE_FORMAT_R8G8B8_SNORM,
 163    PIPE_FORMAT_R8G8B8A8_SNORM
 164 };
 165
 166 static GLuint byte_types_scale[4] = {
 167    PIPE_FORMAT_R8_SSCALED,
 168    PIPE_FORMAT_R8G8_SSCALED,
 169    PIPE_FORMAT_R8G8B8_SSCALED,
 170    PIPE_FORMAT_R8G8B8A8_SSCALED
 171 };
 172
 173 static GLuint fixed_types[4] = {
 174    PIPE_FORMAT_R32_FIXED,
 175    PIPE_FORMAT_R32G32_FIXED,
 176    PIPE_FORMAT_R32G32B32_FIXED,
 177    PIPE_FORMAT_R32G32B32A32_FIXED
 178 };
 179
 180
 181
 182 /**
 183  * Return a PIPE_FORMAT_x for the given GL datatype and size.
 184  */
 185 enum pipe_format
 186 st_pipe_vertex_format(GLenum type, GLuint size, GLenum format,
 187                       GLboolean normalized)
 188 {
 189    assert((type >= GL_BYTE && type <= GL_DOUBLE) ||
 190           type == GL_FIXED || type == GL_HALF_FLOAT);
 191    assert(size >= 1);
 192    assert(size <= 4);
 193    assert(format == GL_RGBA || format == GL_BGRA);
 194
 195    if (format == GL_BGRA) {
 196       /* this is an odd-ball case */
 197       assert(type == GL_UNSIGNED_BYTE);
 198       assert(normalized);
 199       return PIPE_FORMAT_B8G8R8A8_UNORM;
 200    }
 201
 202    if (normalized) {
 203       switch (type) {
 204       case GL_DOUBLE: return double_types[size-1];
 205       case GL_FLOAT: return float_types[size-1];
 206       case GL_HALF_FLOAT: return half_float_types[size-1];
 207       case GL_INT: return int_types_norm[size-1];
 208       case GL_SHORT: return short_types_norm[size-1];
 209       case GL_BYTE: return byte_types_norm[size-1];
 210       case GL_UNSIGNED_INT: return uint_types_norm[size-1];
 211       case GL_UNSIGNED_SHORT: return ushort_types_norm[size-1];
 212       case GL_UNSIGNED_BYTE: return ubyte_types_norm[size-1];
 213       case GL_FIXED: return fixed_types[size-1];
 214       default: assert(0); return 0;
 215       }
 216    }
 217    else {
 218       switch (type) {
 219       case GL_DOUBLE: return double_types[size-1];
 220       case GL_FLOAT: return float_types[size-1];
 221       case GL_HALF_FLOAT: return half_float_types[size-1];
 222       case GL_INT: return int_types_scale[size-1];
 223       case GL_SHORT: return short_types_scale[size-1];
 224       case GL_BYTE: return byte_types_scale[size-1];
 225       case GL_UNSIGNED_INT: return uint_types_scale[size-1];
 226       case GL_UNSIGNED_SHORT: return ushort_types_scale[size-1];
 227       case GL_UNSIGNED_BYTE: return ubyte_types_scale[size-1];
 228       case GL_FIXED: return fixed_types[size-1];
 229       default: assert(0); return 0;
 230       }
 231    }
 232    return PIPE_FORMAT_NONE; /* silence compiler warning */
 233 }
 234
 235
 236
 237 /**
 238  * Examine the active arrays to determine if we have interleaved
 239  * vertex arrays all living in one VBO, or all living in user space.
 240  */
 241 static GLboolean
 242 is_interleaved_arrays(const struct st_vertex_program *vp,
 243                       const struct st_vp_variant *vpv,
 244                       const struct gl_client_array **arrays)
 245 {
 246    GLuint attr;
 247    const struct gl_buffer_object *firstBufObj = NULL;
 248    GLint firstStride = -1;
 249    const GLubyte *firstPtr = NULL;
 250    GLboolean userSpaceBuffer = GL_FALSE;
 251
 252    for (attr = 0; attr < vpv->num_inputs; attr++) {
 253       const GLuint mesaAttr = vp->index_to_input[attr];
 254       const struct gl_client_array *array = arrays[mesaAttr];
 255       const struct gl_buffer_object *bufObj = array->BufferObj;
 256       const GLsizei stride = array->StrideB; /* in bytes */
 257
 258       if (attr == 0) {
 259          /* save info about the first array */
 260          firstStride = stride;
 261          firstPtr = array->Ptr;
 262          firstBufObj = bufObj;
 263          userSpaceBuffer = !bufObj || !bufObj->Name;
 264       }
 265       else {
 266          /* check if other arrays interleave with the first, in same buffer */
 267          if (stride != firstStride)
 268             return GL_FALSE; /* strides don't match */
 269
 270          if (bufObj != firstBufObj)
 271             return GL_FALSE; /* arrays in different VBOs */
 272
 273          if (abs(array->Ptr - firstPtr) > firstStride)
 274             return GL_FALSE; /* arrays start too far apart */
 275
 276          if ((!bufObj || !_mesa_is_bufferobj(bufObj)) != userSpaceBuffer)
 277             return GL_FALSE; /* mix of VBO and user-space arrays */
 278       }
 279    }
 280
 281    return GL_TRUE;
 282 }
 283
 284
 285 /**
 286  * Set up for drawing interleaved arrays that all live in one VBO
 287  * or all live in user space.
 288  * \param vbuffer  returns vertex buffer info
 289  * \param velements  returns vertex element info
 290  */
 291 static void
 292 setup_interleaved_attribs(struct gl_context *ctx,
 293                           const struct st_vertex_program *vp,
 294                           const struct st_vp_variant *vpv,
 295                           const struct gl_client_array **arrays,
 296                           struct pipe_vertex_buffer *vbuffer,
 297                           struct pipe_vertex_element velements[],
 298                           unsigned max_index,
 299                           unsigned num_instances)
 300 {
 301    struct st_context *st = st_context(ctx);
 302    struct pipe_context *pipe = st->pipe;
 303    GLuint attr;
 304    const GLubyte *low_addr = NULL;
 305
 306    /* Find the lowest address of the arrays we're drawing */
 307    if (vpv->num_inputs) {
 308       low_addr = arrays[vp->index_to_input[0]]->Ptr;
 309
 310       for (attr = 1; attr < vpv->num_inputs; attr++) {
 311          const GLubyte *start = arrays[vp->index_to_input[attr]]->Ptr;
 312          low_addr = MIN2(low_addr, start);
 313       }
 314    }
 315
 316    for (attr = 0; attr < vpv->num_inputs; attr++) {
 317       const GLuint mesaAttr = vp->index_to_input[attr];
 318       const struct gl_client_array *array = arrays[mesaAttr];
 319       struct gl_buffer_object *bufobj = array->BufferObj;
 320       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 321       unsigned src_offset = (unsigned) (array->Ptr - low_addr);
 322       GLuint element_size = array->_ElementSize;
 323       GLsizei stride = array->StrideB;
 324
 325       assert(element_size == array->Size * _mesa_sizeof_type(array->Type));
 326
 327       if (attr == 0) {
 328          if (bufobj && _mesa_is_bufferobj(bufobj)) {
 329             vbuffer->buffer = NULL;
 330             pipe_resource_reference(&vbuffer->buffer, stobj->buffer);
 331             vbuffer->buffer_offset = pointer_to_offset(low_addr);
 332          }
 333          else {
 334             uint divisor = array->InstanceDivisor;
 335             uint last_index = divisor ? num_instances / divisor : max_index;
 336             uint bytes = src_offset + stride * last_index + element_size;
 337
 338             vbuffer->buffer = pipe_user_buffer_create(pipe->screen,
 339                                                       (void*) low_addr,
 340                                                       bytes,
 341                                                       PIPE_BIND_VERTEX_BUFFER);
 342             vbuffer->buffer_offset = 0;
 343
 344             /* Track user vertex buffers. */
 345             pipe_resource_reference(&st->user_attrib[0].buffer, vbuffer->buffer);
 346             st->user_attrib[0].element_size = element_size;
 347             st->user_attrib[0].stride = stride;
 348             st->num_user_attribs = 1;
 349          }
 350          vbuffer->stride = stride; /* in bytes */
 351       }
 352
 353       velements[attr].src_offset = src_offset;
 354       velements[attr].instance_divisor = array->InstanceDivisor;
 355       velements[attr].vertex_buffer_index = 0;
 356       velements[attr].src_format = st_pipe_vertex_format(array->Type,
 357                                                          array->Size,
 358                                                          array->Format,
 359                                                          array->Normalized);
 360       assert(velements[attr].src_format);
 361    }
 362 }
 363
 364
 365 /**
 366  * Set up a separate pipe_vertex_buffer and pipe_vertex_element for each
 367  * vertex attribute.
 368  * \param vbuffer  returns vertex buffer info
 369  * \param velements  returns vertex element info
 370  */
 371 static void
 372 setup_non_interleaved_attribs(struct gl_context *ctx,
 373                               const struct st_vertex_program *vp,
 374                               const struct st_vp_variant *vpv,
 375                               const struct gl_client_array **arrays,
 376                               struct pipe_vertex_buffer vbuffer[],
 377                               struct pipe_vertex_element velements[],
 378                               unsigned max_index,
 379                               unsigned num_instances)
 380 {
 381    struct st_context *st = st_context(ctx);
 382    struct pipe_context *pipe = st->pipe;
 383    GLuint attr;
 384
 385    for (attr = 0; attr < vpv->num_inputs; attr++) {
 386       const GLuint mesaAttr = vp->index_to_input[attr];
 387       const struct gl_client_array *array = arrays[mesaAttr];
 388       struct gl_buffer_object *bufobj = array->BufferObj;
 389       GLuint element_size = array->_ElementSize;
 390       GLsizei stride = array->StrideB;
 391
 392       assert(element_size == array->Size * _mesa_sizeof_type(array->Type));
 393
 394       if (bufobj && _mesa_is_bufferobj(bufobj)) {
 395          /* Attribute data is in a VBO.
 396           * Recall that for VBOs, the gl_client_array->Ptr field is
 397           * really an offset from the start of the VBO, not a pointer.
 398           */
 399          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 400          assert(stobj->buffer);
 401
 402          vbuffer[attr].buffer = NULL;
 403          pipe_resource_reference(&vbuffer[attr].buffer, stobj->buffer);
 404          vbuffer[attr].buffer_offset = pointer_to_offset(array->Ptr);
 405       }
 406       else {
 407          /* wrap user data */
 408          uint bytes;
 409          void *ptr;
 410
 411          if (array->Ptr) {
 412             uint divisor = array->InstanceDivisor;
 413             uint last_index = divisor ? num_instances / divisor : max_index;
 414
 415             bytes = stride * last_index + element_size;
 416
 417             ptr = (void *) array->Ptr;
 418          }
 419          else {
 420             /* no array, use ctx->Current.Attrib[] value */
 421             bytes = element_size = sizeof(ctx->Current.Attrib[0]);
 422             ptr = (void *) ctx->Current.Attrib[mesaAttr];
 423             stride = 0;
 424          }
 425
 426          assert(ptr);
 427          assert(bytes);
 428
 429          vbuffer[attr].buffer =
 430             pipe_user_buffer_create(pipe->screen, ptr, bytes,
 431                                     PIPE_BIND_VERTEX_BUFFER);
 432
 433          vbuffer[attr].buffer_offset = 0;
 434
 435          /* Track user vertex buffers. */
 436          pipe_resource_reference(&st->user_attrib[attr].buffer, vbuffer[attr].buffer);
 437          st->user_attrib[attr].element_size = element_size;
 438          st->user_attrib[attr].stride = stride;
 439          st->num_user_attribs = MAX2(st->num_user_attribs, attr + 1);
 440       }
 441
 442       /* common-case setup */
 443       vbuffer[attr].stride = stride; /* in bytes */
 444
 445       velements[attr].src_offset = 0;
 446       velements[attr].instance_divisor = array->InstanceDivisor;
 447       velements[attr].vertex_buffer_index = attr;
 448       velements[attr].src_format = st_pipe_vertex_format(array->Type,
 449                                                          array->Size,
 450                                                          array->Format,
 451                                                          array->Normalized);
 452       assert(velements[attr].src_format);
 453    }
 454 }
 455
 456
 457 static void
 458 setup_index_buffer(struct gl_context *ctx,
 459                    const struct _mesa_index_buffer *ib,
 460                    struct pipe_index_buffer *ibuffer)
 461 {
 462    struct st_context *st = st_context(ctx);
 463    struct pipe_context *pipe = st->pipe;
 464
 465    memset(ibuffer, 0, sizeof(*ibuffer));
 466    if (ib) {
 467       struct gl_buffer_object *bufobj = ib->obj;
 468
 469       switch (ib->type) {
 470       case GL_UNSIGNED_INT:
 471          ibuffer->index_size = 4;
 472          break;
 473       case GL_UNSIGNED_SHORT:
 474          ibuffer->index_size = 2;
 475          break;
 476       case GL_UNSIGNED_BYTE:
 477          ibuffer->index_size = 1;
 478          break;
 479       default:
 480          assert(0);
 481          return;
 482       }
 483
 484       /* get/create the index buffer object */
 485       if (bufobj && _mesa_is_bufferobj(bufobj)) {
 486          /* elements/indexes are in a real VBO */
 487          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 488          pipe_resource_reference(&ibuffer->buffer, stobj->buffer);
 489          ibuffer->offset = pointer_to_offset(ib->ptr);
 490       }
 491       else {
 492          /* element/indicies are in user space memory */
 493          ibuffer->buffer =
 494             pipe_user_buffer_create(pipe->screen, (void *) ib->ptr,
 495                                     ib->count * ibuffer->index_size,
 496                                     PIPE_BIND_INDEX_BUFFER);
 497       }
 498    }
 499 }
 500
 501 /**
 502  * Prior to drawing, check that any uniforms referenced by the
 503  * current shader have been set.  If a uniform has not been set,
 504  * issue a warning.
 505  */
 506 static void
 507 check_uniforms(struct gl_context *ctx)
 508 {
 509    struct gl_shader_program *shProg[3] = {
 510       ctx->Shader.CurrentVertexProgram,
 511       ctx->Shader.CurrentGeometryProgram,
 512       ctx->Shader.CurrentFragmentProgram,
 513    };
 514    unsigned j;
 515
 516    for (j = 0; j < 3; j++) {
 517       unsigned i;
 518
 519       if (shProg[j] == NULL || !shProg[j]->LinkStatus)
 520          continue;
 521
 522       for (i = 0; i < shProg[j]->Uniforms->NumUniforms; i++) {
 523          const struct gl_uniform *u = &shProg[j]->Uniforms->Uniforms[i];
 524          if (!u->Initialized) {
 525             _mesa_warning(ctx,
 526                           "Using shader with uninitialized uniform: %s",
 527                           u->Name);
 528          }
 529       }
 530    }
 531 }
 532
 533
 534 /**
 535  * Translate OpenGL primtive type (GL_POINTS, GL_TRIANGLE_STRIP, etc) to
 536  * the corresponding Gallium type.
 537  */
 538 static unsigned
 539 translate_prim(const struct gl_context *ctx, unsigned prim)
 540 {
 541    /* GL prims should match Gallium prims, spot-check a few */
 542    assert(GL_POINTS == PIPE_PRIM_POINTS);
 543    assert(GL_QUADS == PIPE_PRIM_QUADS);
 544    assert(GL_TRIANGLE_STRIP_ADJACENCY == PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY);
 545
 546    /* Avoid quadstrips if it's easy to do so:
 547     * Note: it's imporant to do the correct trimming if we change the prim type!
 548     * We do that wherever this function is called.
 549     */
 550    if (prim == GL_QUAD_STRIP &&
 551        ctx->Light.ShadeModel != GL_FLAT &&
 552        ctx->Polygon.FrontMode == GL_FILL &&
 553        ctx->Polygon.BackMode == GL_FILL)
 554       prim = GL_TRIANGLE_STRIP;
 555
 556    return prim;
 557 }
 558
 559
 560 static void
 561 st_validate_varrays(struct gl_context *ctx,
 562                     const struct gl_client_array **arrays,
 563                     unsigned max_index,
 564                     unsigned num_instances)
 565 {
 566    struct st_context *st = st_context(ctx);
 567    const struct st_vertex_program *vp;
 568    const struct st_vp_variant *vpv;
 569    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 570    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 571    unsigned num_vbuffers, num_velements;
 572    GLuint attr;
 573    unsigned i;
 574
 575    /* must get these after state validation! */
 576    vp = st->vp;
 577    vpv = st->vp_variant;
 578
 579    memset(velements, 0, sizeof(struct pipe_vertex_element) * vpv->num_inputs);
 580
 581    /* Unreference any user vertex buffers. */
 582    for (i = 0; i < st->num_user_attribs; i++) {
 583       pipe_resource_reference(&st->user_attrib[i].buffer, NULL);
 584    }
 585    st->num_user_attribs = 0;
 586
 587    /*
 588     * Setup the vbuffer[] and velements[] arrays.
 589     */
 590    if (is_interleaved_arrays(vp, vpv, arrays)) {
 591       setup_interleaved_attribs(ctx, vp, vpv, arrays, vbuffer, velements,
 592                                 max_index, num_instances);
 593
 594       num_vbuffers = 1;
 595       num_velements = vpv->num_inputs;
 596       if (num_velements == 0)
 597          num_vbuffers = 0;
 598    }
 599    else {
 600       setup_non_interleaved_attribs(ctx, vp, vpv, arrays,
 601                                     vbuffer, velements, max_index,
 602                                     num_instances);
 603       num_vbuffers = vpv->num_inputs;
 604       num_velements = vpv->num_inputs;
 605    }
 606
 607    cso_set_vertex_buffers(st->cso_context, num_vbuffers, vbuffer);
 608    cso_set_vertex_elements(st->cso_context, num_velements, velements);
 609
 610    /* unreference buffers (frees wrapped user-space buffer objects)
 611     * This is OK, because the pipe driver should reference buffers by itself
 612     * in set_vertex_buffers. */
 613    for (attr = 0; attr < num_vbuffers; attr++) {
 614       pipe_resource_reference(&vbuffer[attr].buffer, NULL);
 615       assert(!vbuffer[attr].buffer);
 616    }
 617 }
 618
 619
 620 /**
 621  * This function gets plugged into the VBO module and is called when
 622  * we have something to render.
 623  * Basically, translate the information into the format expected by gallium.
 624  */
 625 void
 626 st_draw_vbo(struct gl_context *ctx,
 627             const struct gl_client_array **arrays,
 628             const struct _mesa_prim *prims,
 629             GLuint nr_prims,
 630             const struct _mesa_index_buffer *ib,
 631             GLboolean index_bounds_valid,
 632             GLuint min_index,
 633             GLuint max_index)
 634 {
 635    struct st_context *st = st_context(ctx);
 636    struct pipe_context *pipe = st->pipe;
 637    struct pipe_index_buffer ibuffer;
 638    struct pipe_draw_info info;
 639    unsigned i, num_instances = 1;
 640    GLboolean new_array =
 641       st->dirty.st &&
 642       (st->dirty.mesa & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT)) != 0;
 643
 644    /* Mesa core state should have been validated already */
 645    assert(ctx->NewState == 0x0);
 646
 647    if (ib) {
 648       /* Gallium probably doesn't want this in some cases. */
 649       if (!index_bounds_valid)
 650          if (!vbo_all_varyings_in_vbos(arrays))
 651             vbo_get_minmax_index(ctx, prims, ib, &min_index, &max_index);
 652
 653       for (i = 0; i < nr_prims; i++) {
 654          num_instances = MAX2(num_instances, prims[i].num_instances);
 655       }
 656    }
 657    else {
 658       /* Get min/max index for non-indexed drawing. */
 659       min_index = ~0;
 660       max_index = 0;
 661
 662       for (i = 0; i < nr_prims; i++) {
 663          min_index = MIN2(min_index, prims[i].start);
 664          max_index = MAX2(max_index, prims[i].start + prims[i].count - 1);
 665          num_instances = MAX2(num_instances, prims[i].num_instances);
 666       }
 667    }
 668
 669    /* Validate state. */
 670    if (st->dirty.st) {
 671       GLboolean vertDataEdgeFlags;
 672
 673       /* sanity check for pointer arithmetic below */
 674       assert(sizeof(arrays[0]->Ptr[0]) == 1);
 675
 676       vertDataEdgeFlags = arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj &&
 677                           arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj->Name;
 678       if (vertDataEdgeFlags != st->vertdata_edgeflags) {
 679          st->vertdata_edgeflags = vertDataEdgeFlags;
 680          st->dirty.st |= ST_NEW_EDGEFLAGS_DATA;
 681       }
 682
 683       st_validate_state(st);
 684
 685       if (new_array) {
 686          st_validate_varrays(ctx, arrays, max_index, num_instances);
 687       }
 688
 689 #if 0
 690       if (MESA_VERBOSE & VERBOSE_GLSL) {
 691          check_uniforms(ctx);
 692       }
 693 #else
 694       (void) check_uniforms;
 695 #endif
 696    }
 697
 698    /* Notify the driver that the content of user buffers may have been
 699     * changed. */
 700    assert(max_index >= min_index);
 701    if (!new_array && st->num_user_attribs) {
 702       for (i = 0; i < st->num_user_attribs; i++) {
 703          if (st->user_attrib[i].buffer) {
 704             unsigned element_size = st->user_attrib[i].element_size;
 705             unsigned stride = st->user_attrib[i].stride;
 706             unsigned min_offset = min_index * stride;
 707             unsigned max_offset = max_index * stride + element_size;
 708
 709             assert(max_offset > min_offset);
 710
 711             pipe->redefine_user_buffer(pipe, st->user_attrib[i].buffer,
 712                                        min_offset,
 713                                        max_offset - min_offset);
 714          }
 715       }
 716    }
 717
 718    setup_index_buffer(ctx, ib, &ibuffer);
 719    pipe->set_index_buffer(pipe, &ibuffer);
 720
 721    util_draw_init_info(&info);
 722    if (ib) {
 723       info.indexed = TRUE;
 724       if (min_index != ~0 && max_index != ~0) {
 725          info.min_index = min_index;
 726          info.max_index = max_index;
 727       }
 728    }
 729
 730    info.primitive_restart = st->ctx->Array.PrimitiveRestart;
 731    info.restart_index = st->ctx->Array.RestartIndex;
 732
 733    /* do actual drawing */
 734    for (i = 0; i < nr_prims; i++) {
 735       info.mode = translate_prim( ctx, prims[i].mode );
 736       info.start = prims[i].start;
 737       info.count = prims[i].count;
 738       info.instance_count = prims[i].num_instances;
 739       info.index_bias = prims[i].basevertex;
 740       if (!ib) {
 741          info.min_index = info.start;
 742          info.max_index = info.start + info.count - 1;
 743       }
 744
 745       if (u_trim_pipe_prim(info.mode, &info.count))
 746          pipe->draw_vbo(pipe, &info);
 747    }
 748
 749    pipe_resource_reference(&ibuffer.buffer, NULL);
 750 }
 751
 752
 753 void
 754 st_init_draw(struct st_context *st)
 755 {
 756    struct gl_context *ctx = st->ctx;
 757
 758    vbo_set_draw_func(ctx, st_draw_vbo);
 759
 760 #if FEATURE_feedback || FEATURE_rastpos
 761    st->draw = draw_create(st->pipe); /* for selection/feedback */
 762
 763    /* Disable draw options that might convert points/lines to tris, etc.
 764     * as that would foul-up feedback/selection mode.
 765     */
 766    draw_wide_line_threshold(st->draw, 1000.0f);
 767    draw_wide_point_threshold(st->draw, 1000.0f);
 768    draw_enable_line_stipple(st->draw, FALSE);
 769    draw_enable_point_sprites(st->draw, FALSE);
 770 #endif
 771 }
 772
 773
 774 void
 775 st_destroy_draw(struct st_context *st)
 776 {
 777 #if FEATURE_feedback || FEATURE_rastpos
 778    draw_destroy(st->draw);
 779 #endif
 780 }