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 "main/mfeatures.h"
  47 #include "program/prog_uniform.h"
  48
  49 #include "vbo/vbo.h"
  50
  51 #include "st_context.h"
  52 #include "st_atom.h"
  53 #include "st_cb_bufferobjects.h"
  54 #include "st_draw.h"
  55 #include "st_program.h"
  56
  57 #include "pipe/p_context.h"
  58 #include "pipe/p_defines.h"
  59 #include "util/u_inlines.h"
  60 #include "util/u_format.h"
  61 #include "util/u_prim.h"
  62 #include "util/u_draw_quad.h"
  63 #include "draw/draw_context.h"
  64 #include "cso_cache/cso_context.h"
  65
  66
  67 static GLuint double_types[4] = {
  68    PIPE_FORMAT_R64_FLOAT,
  69    PIPE_FORMAT_R64G64_FLOAT,
  70    PIPE_FORMAT_R64G64B64_FLOAT,
  71    PIPE_FORMAT_R64G64B64A64_FLOAT
  72 };
  73
  74 static GLuint float_types[4] = {
  75    PIPE_FORMAT_R32_FLOAT,
  76    PIPE_FORMAT_R32G32_FLOAT,
  77    PIPE_FORMAT_R32G32B32_FLOAT,
  78    PIPE_FORMAT_R32G32B32A32_FLOAT
  79 };
  80
  81 static GLuint half_float_types[4] = {
  82    PIPE_FORMAT_R16_FLOAT,
  83    PIPE_FORMAT_R16G16_FLOAT,
  84    PIPE_FORMAT_R16G16B16_FLOAT,
  85    PIPE_FORMAT_R16G16B16A16_FLOAT
  86 };
  87
  88 static GLuint uint_types_norm[4] = {
  89    PIPE_FORMAT_R32_UNORM,
  90    PIPE_FORMAT_R32G32_UNORM,
  91    PIPE_FORMAT_R32G32B32_UNORM,
  92    PIPE_FORMAT_R32G32B32A32_UNORM
  93 };
  94
  95 static GLuint uint_types_scale[4] = {
  96    PIPE_FORMAT_R32_USCALED,
  97    PIPE_FORMAT_R32G32_USCALED,
  98    PIPE_FORMAT_R32G32B32_USCALED,
  99    PIPE_FORMAT_R32G32B32A32_USCALED
 100 };
 101
 102 static GLuint int_types_norm[4] = {
 103    PIPE_FORMAT_R32_SNORM,
 104    PIPE_FORMAT_R32G32_SNORM,
 105    PIPE_FORMAT_R32G32B32_SNORM,
 106    PIPE_FORMAT_R32G32B32A32_SNORM
 107 };
 108
 109 static GLuint int_types_scale[4] = {
 110    PIPE_FORMAT_R32_SSCALED,
 111    PIPE_FORMAT_R32G32_SSCALED,
 112    PIPE_FORMAT_R32G32B32_SSCALED,
 113    PIPE_FORMAT_R32G32B32A32_SSCALED
 114 };
 115
 116 static GLuint ushort_types_norm[4] = {
 117    PIPE_FORMAT_R16_UNORM,
 118    PIPE_FORMAT_R16G16_UNORM,
 119    PIPE_FORMAT_R16G16B16_UNORM,
 120    PIPE_FORMAT_R16G16B16A16_UNORM
 121 };
 122
 123 static GLuint ushort_types_scale[4] = {
 124    PIPE_FORMAT_R16_USCALED,
 125    PIPE_FORMAT_R16G16_USCALED,
 126    PIPE_FORMAT_R16G16B16_USCALED,
 127    PIPE_FORMAT_R16G16B16A16_USCALED
 128 };
 129
 130 static GLuint short_types_norm[4] = {
 131    PIPE_FORMAT_R16_SNORM,
 132    PIPE_FORMAT_R16G16_SNORM,
 133    PIPE_FORMAT_R16G16B16_SNORM,
 134    PIPE_FORMAT_R16G16B16A16_SNORM
 135 };
 136
 137 static GLuint short_types_scale[4] = {
 138    PIPE_FORMAT_R16_SSCALED,
 139    PIPE_FORMAT_R16G16_SSCALED,
 140    PIPE_FORMAT_R16G16B16_SSCALED,
 141    PIPE_FORMAT_R16G16B16A16_SSCALED
 142 };
 143
 144 static GLuint ubyte_types_norm[4] = {
 145    PIPE_FORMAT_R8_UNORM,
 146    PIPE_FORMAT_R8G8_UNORM,
 147    PIPE_FORMAT_R8G8B8_UNORM,
 148    PIPE_FORMAT_R8G8B8A8_UNORM
 149 };
 150
 151 static GLuint ubyte_types_scale[4] = {
 152    PIPE_FORMAT_R8_USCALED,
 153    PIPE_FORMAT_R8G8_USCALED,
 154    PIPE_FORMAT_R8G8B8_USCALED,
 155    PIPE_FORMAT_R8G8B8A8_USCALED
 156 };
 157
 158 static GLuint byte_types_norm[4] = {
 159    PIPE_FORMAT_R8_SNORM,
 160    PIPE_FORMAT_R8G8_SNORM,
 161    PIPE_FORMAT_R8G8B8_SNORM,
 162    PIPE_FORMAT_R8G8B8A8_SNORM
 163 };
 164
 165 static GLuint byte_types_scale[4] = {
 166    PIPE_FORMAT_R8_SSCALED,
 167    PIPE_FORMAT_R8G8_SSCALED,
 168    PIPE_FORMAT_R8G8B8_SSCALED,
 169    PIPE_FORMAT_R8G8B8A8_SSCALED
 170 };
 171
 172 static GLuint fixed_types[4] = {
 173    PIPE_FORMAT_R32_FIXED,
 174    PIPE_FORMAT_R32G32_FIXED,
 175    PIPE_FORMAT_R32G32B32_FIXED,
 176    PIPE_FORMAT_R32G32B32A32_FIXED
 177 };
 178
 179
 180
 181 /**
 182  * Return a PIPE_FORMAT_x for the given GL datatype and size.
 183  */
 184 enum pipe_format
 185 st_pipe_vertex_format(GLenum type, GLuint size, GLenum format,
 186                       GLboolean normalized)
 187 {
 188    assert((type >= GL_BYTE && type <= GL_DOUBLE) ||
 189           type == GL_FIXED || type == GL_HALF_FLOAT);
 190    assert(size >= 1);
 191    assert(size <= 4);
 192    assert(format == GL_RGBA || format == GL_BGRA);
 193
 194    if (format == GL_BGRA) {
 195       /* this is an odd-ball case */
 196       assert(type == GL_UNSIGNED_BYTE);
 197       assert(normalized);
 198       return PIPE_FORMAT_B8G8R8A8_UNORM;
 199    }
 200
 201    if (normalized) {
 202       switch (type) {
 203       case GL_DOUBLE: return double_types[size-1];
 204       case GL_FLOAT: return float_types[size-1];
 205       case GL_HALF_FLOAT: return half_float_types[size-1];
 206       case GL_INT: return int_types_norm[size-1];
 207       case GL_SHORT: return short_types_norm[size-1];
 208       case GL_BYTE: return byte_types_norm[size-1];
 209       case GL_UNSIGNED_INT: return uint_types_norm[size-1];
 210       case GL_UNSIGNED_SHORT: return ushort_types_norm[size-1];
 211       case GL_UNSIGNED_BYTE: return ubyte_types_norm[size-1];
 212       case GL_FIXED: return fixed_types[size-1];
 213       default: assert(0); return 0;
 214       }
 215    }
 216    else {
 217       switch (type) {
 218       case GL_DOUBLE: return double_types[size-1];
 219       case GL_FLOAT: return float_types[size-1];
 220       case GL_HALF_FLOAT: return half_float_types[size-1];
 221       case GL_INT: return int_types_scale[size-1];
 222       case GL_SHORT: return short_types_scale[size-1];
 223       case GL_BYTE: return byte_types_scale[size-1];
 224       case GL_UNSIGNED_INT: return uint_types_scale[size-1];
 225       case GL_UNSIGNED_SHORT: return ushort_types_scale[size-1];
 226       case GL_UNSIGNED_BYTE: return ubyte_types_scale[size-1];
 227       case GL_FIXED: return fixed_types[size-1];
 228       default: assert(0); return 0;
 229       }
 230    }
 231    return PIPE_FORMAT_NONE; /* silence compiler warning */
 232 }
 233
 234
 235
 236 /**
 237  * Examine the active arrays to determine if we have interleaved
 238  * vertex arrays all living in one VBO, or all living in user space.
 239  * \param userSpace  returns whether the arrays are 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 *client_addr = NULL;
 250    GLboolean user_memory;
 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 (firstStride < 0) {
 259          firstStride = stride;
 260          user_memory = !bufObj || !bufObj->Name;
 261       }
 262       else if (firstStride != stride) {
 263          return GL_FALSE;
 264       }
 265
 266       if (!bufObj || !bufObj->Name) {
 267          /* Try to detect if the client-space arrays are
 268           * "close" to each other.
 269           */
 270          if (!user_memory) {
 271             return GL_FALSE;
 272          }
 273          if (!client_addr) {
 274             client_addr = array->Ptr;
 275          }
 276          else if (abs(array->Ptr - client_addr) > firstStride) {
 277             /* arrays start too far apart */
 278             return GL_FALSE;
 279          }
 280       }
 281       else if (!firstBufObj) {
 282          if (user_memory) {
 283             return GL_FALSE;
 284          }
 285          firstBufObj = bufObj;
 286       }
 287       else if (bufObj != firstBufObj) {
 288          return GL_FALSE;
 289       }
 290    }
 291
 292    return GL_TRUE;
 293 }
 294
 295
 296 /**
 297  * Set up for drawing interleaved arrays that all live in one VBO
 298  * or all live in user space.
 299  * \param vbuffer  returns vertex buffer info
 300  * \param velements  returns vertex element info
 301  */
 302 static void
 303 setup_interleaved_attribs(struct gl_context *ctx,
 304                           const struct st_vertex_program *vp,
 305                           const struct st_vp_variant *vpv,
 306                           const struct gl_client_array **arrays,
 307                           struct pipe_vertex_buffer *vbuffer,
 308                           struct pipe_vertex_element velements[],
 309                           unsigned max_index,
 310                           unsigned num_instances)
 311 {
 312    struct st_context *st = st_context(ctx);
 313    struct pipe_context *pipe = st->pipe;
 314    GLuint attr;
 315    const GLubyte *low_addr = NULL;
 316
 317    /* Find the lowest address of the arrays we're drawing */
 318    if (vpv->num_inputs) {
 319       low_addr = arrays[vp->index_to_input[0]]->Ptr;
 320
 321       for (attr = 1; attr < vpv->num_inputs; attr++) {
 322          const GLubyte *start = arrays[vp->index_to_input[attr]]->Ptr;
 323          low_addr = MIN2(low_addr, start);
 324       }
 325    }
 326
 327    for (attr = 0; attr < vpv->num_inputs; attr++) {
 328       const GLuint mesaAttr = vp->index_to_input[attr];
 329       const struct gl_client_array *array = arrays[mesaAttr];
 330       struct gl_buffer_object *bufobj = array->BufferObj;
 331       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 332       unsigned src_offset = (unsigned) (array->Ptr - low_addr);
 333       GLuint element_size = array->_ElementSize;
 334       GLsizei stride = array->StrideB;
 335
 336       assert(element_size == array->Size * _mesa_sizeof_type(array->Type));
 337
 338       if (attr == 0) {
 339          if (bufobj && bufobj->Name) {
 340             vbuffer->buffer = NULL;
 341             pipe_resource_reference(&vbuffer->buffer, stobj->buffer);
 342             vbuffer->buffer_offset = pointer_to_offset(low_addr);
 343          }
 344          else {
 345             uint divisor = array->InstanceDivisor;
 346             uint last_index = divisor ? num_instances / divisor : max_index;
 347             uint bytes = src_offset + stride * last_index + element_size;
 348
 349             vbuffer->buffer = pipe_user_buffer_create(pipe->screen,
 350                                                       (void*) low_addr,
 351                                                       bytes,
 352                                                       PIPE_BIND_VERTEX_BUFFER);
 353             vbuffer->buffer_offset = 0;
 354
 355             /* Track user vertex buffers. */
 356             pipe_resource_reference(&st->user_attrib[0].buffer, vbuffer->buffer);
 357             st->user_attrib[0].element_size = element_size;
 358             st->user_attrib[0].stride = stride;
 359             st->num_user_attribs = 1;
 360          }
 361          vbuffer->stride = stride; /* in bytes */
 362       }
 363
 364       velements[attr].src_offset = src_offset;
 365       velements[attr].instance_divisor = array->InstanceDivisor;
 366       velements[attr].vertex_buffer_index = 0;
 367       velements[attr].src_format = st_pipe_vertex_format(array->Type,
 368                                                          array->Size,
 369                                                          array->Format,
 370                                                          array->Normalized);
 371       assert(velements[attr].src_format);
 372    }
 373 }
 374
 375
 376 /**
 377  * Set up a separate pipe_vertex_buffer and pipe_vertex_element for each
 378  * vertex attribute.
 379  * \param vbuffer  returns vertex buffer info
 380  * \param velements  returns vertex element info
 381  */
 382 static void
 383 setup_non_interleaved_attribs(struct gl_context *ctx,
 384                               const struct st_vertex_program *vp,
 385                               const struct st_vp_variant *vpv,
 386                               const struct gl_client_array **arrays,
 387                               struct pipe_vertex_buffer vbuffer[],
 388                               struct pipe_vertex_element velements[],
 389                               unsigned max_index,
 390                               unsigned num_instances)
 391 {
 392    struct st_context *st = st_context(ctx);
 393    struct pipe_context *pipe = st->pipe;
 394    GLuint attr;
 395
 396    for (attr = 0; attr < vpv->num_inputs; attr++) {
 397       const GLuint mesaAttr = vp->index_to_input[attr];
 398       const struct gl_client_array *array = arrays[mesaAttr];
 399       struct gl_buffer_object *bufobj = array->BufferObj;
 400       GLuint element_size = array->_ElementSize;
 401       GLsizei stride = array->StrideB;
 402
 403       assert(element_size == array->Size * _mesa_sizeof_type(array->Type));
 404
 405       if (bufobj && bufobj->Name) {
 406          /* Attribute data is in a VBO.
 407           * Recall that for VBOs, the gl_client_array->Ptr field is
 408           * really an offset from the start of the VBO, not a pointer.
 409           */
 410          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 411          assert(stobj->buffer);
 412
 413          vbuffer[attr].buffer = NULL;
 414          pipe_resource_reference(&vbuffer[attr].buffer, stobj->buffer);
 415          vbuffer[attr].buffer_offset = pointer_to_offset(array->Ptr);
 416       }
 417       else {
 418          /* wrap user data */
 419          uint bytes;
 420          void *ptr;
 421
 422          if (array->Ptr) {
 423             uint divisor = array->InstanceDivisor;
 424             uint last_index = divisor ? num_instances / divisor : max_index;
 425
 426             bytes = stride * last_index + element_size;
 427
 428             ptr = (void *) array->Ptr;
 429          }
 430          else {
 431             /* no array, use ctx->Current.Attrib[] value */
 432             bytes = element_size = sizeof(ctx->Current.Attrib[0]);
 433             ptr = (void *) ctx->Current.Attrib[mesaAttr];
 434             stride = 0;
 435          }
 436
 437          assert(ptr);
 438          assert(bytes);
 439
 440          vbuffer[attr].buffer =
 441             pipe_user_buffer_create(pipe->screen, ptr, bytes,
 442                                     PIPE_BIND_VERTEX_BUFFER);
 443
 444          vbuffer[attr].buffer_offset = 0;
 445
 446          /* Track user vertex buffers. */
 447          pipe_resource_reference(&st->user_attrib[attr].buffer, vbuffer[attr].buffer);
 448          st->user_attrib[attr].element_size = element_size;
 449          st->user_attrib[attr].stride = stride;
 450          st->num_user_attribs = MAX2(st->num_user_attribs, attr + 1);
 451       }
 452
 453       /* common-case setup */
 454       vbuffer[attr].stride = stride; /* in bytes */
 455
 456       velements[attr].src_offset = 0;
 457       velements[attr].instance_divisor = array->InstanceDivisor;
 458       velements[attr].vertex_buffer_index = attr;
 459       velements[attr].src_format = st_pipe_vertex_format(array->Type,
 460                                                          array->Size,
 461                                                          array->Format,
 462                                                          array->Normalized);
 463       assert(velements[attr].src_format);
 464    }
 465 }
 466
 467
 468 static void
 469 setup_index_buffer(struct gl_context *ctx,
 470                    const struct _mesa_index_buffer *ib,
 471                    struct pipe_index_buffer *ibuffer)
 472 {
 473    struct st_context *st = st_context(ctx);
 474    struct pipe_context *pipe = st->pipe;
 475
 476    memset(ibuffer, 0, sizeof(*ibuffer));
 477    if (ib) {
 478       struct gl_buffer_object *bufobj = ib->obj;
 479
 480       switch (ib->type) {
 481       case GL_UNSIGNED_INT:
 482          ibuffer->index_size = 4;
 483          break;
 484       case GL_UNSIGNED_SHORT:
 485          ibuffer->index_size = 2;
 486          break;
 487       case GL_UNSIGNED_BYTE:
 488          ibuffer->index_size = 1;
 489          break;
 490       default:
 491          assert(0);
 492          return;
 493       }
 494
 495       /* get/create the index buffer object */
 496       if (bufobj && bufobj->Name) {
 497          /* elements/indexes are in a real VBO */
 498          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 499          pipe_resource_reference(&ibuffer->buffer, stobj->buffer);
 500          ibuffer->offset = pointer_to_offset(ib->ptr);
 501       }
 502       else {
 503          /* element/indicies are in user space memory */
 504          ibuffer->buffer =
 505             pipe_user_buffer_create(pipe->screen, (void *) ib->ptr,
 506                                     ib->count * ibuffer->index_size,
 507                                     PIPE_BIND_INDEX_BUFFER);
 508       }
 509    }
 510 }
 511
 512 /**
 513  * Prior to drawing, check that any uniforms referenced by the
 514  * current shader have been set.  If a uniform has not been set,
 515  * issue a warning.
 516  */
 517 static void
 518 check_uniforms(struct gl_context *ctx)
 519 {
 520    struct gl_shader_program *shProg[3] = {
 521       ctx->Shader.CurrentVertexProgram,
 522       ctx->Shader.CurrentGeometryProgram,
 523       ctx->Shader.CurrentFragmentProgram,
 524    };
 525    unsigned j;
 526
 527    for (j = 0; j < 3; j++) {
 528       unsigned i;
 529
 530       if (shProg[j] == NULL || !shProg[j]->LinkStatus)
 531          continue;
 532
 533       for (i = 0; i < shProg[j]->Uniforms->NumUniforms; i++) {
 534          const struct gl_uniform *u = &shProg[j]->Uniforms->Uniforms[i];
 535          if (!u->Initialized) {
 536             _mesa_warning(ctx,
 537                           "Using shader with uninitialized uniform: %s",
 538                           u->Name);
 539          }
 540       }
 541    }
 542 }
 543
 544
 545 /**
 546  * Translate OpenGL primtive type (GL_POINTS, GL_TRIANGLE_STRIP, etc) to
 547  * the corresponding Gallium type.
 548  */
 549 static unsigned
 550 translate_prim(const struct gl_context *ctx, unsigned prim)
 551 {
 552    /* GL prims should match Gallium prims, spot-check a few */
 553    assert(GL_POINTS == PIPE_PRIM_POINTS);
 554    assert(GL_QUADS == PIPE_PRIM_QUADS);
 555    assert(GL_TRIANGLE_STRIP_ADJACENCY == PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY);
 556
 557    /* Avoid quadstrips if it's easy to do so:
 558     * Note: it's imporant to do the correct trimming if we change the prim type!
 559     * We do that wherever this function is called.
 560     */
 561    if (prim == GL_QUAD_STRIP &&
 562        ctx->Light.ShadeModel != GL_FLAT &&
 563        ctx->Polygon.FrontMode == GL_FILL &&
 564        ctx->Polygon.BackMode == GL_FILL)
 565       prim = GL_TRIANGLE_STRIP;
 566
 567    return prim;
 568 }
 569
 570
 571 static void
 572 st_validate_varrays(struct gl_context *ctx,
 573                     const struct gl_client_array **arrays,
 574                     unsigned max_index,
 575                     unsigned num_instances)
 576 {
 577    struct st_context *st = st_context(ctx);
 578    const struct st_vertex_program *vp;
 579    const struct st_vp_variant *vpv;
 580    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 581    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 582    unsigned num_vbuffers, num_velements;
 583    GLuint attr;
 584    unsigned i;
 585
 586    /* must get these after state validation! */
 587    vp = st->vp;
 588    vpv = st->vp_variant;
 589
 590    memset(velements, 0, sizeof(struct pipe_vertex_element) * vpv->num_inputs);
 591
 592    /* Unreference any user vertex buffers. */
 593    for (i = 0; i < st->num_user_attribs; i++) {
 594       pipe_resource_reference(&st->user_attrib[i].buffer, NULL);
 595    }
 596    st->num_user_attribs = 0;
 597
 598    /*
 599     * Setup the vbuffer[] and velements[] arrays.
 600     */
 601    if (is_interleaved_arrays(vp, vpv, arrays)) {
 602       setup_interleaved_attribs(ctx, vp, vpv, arrays, vbuffer, velements,
 603                                 max_index, num_instances);
 604
 605       num_vbuffers = 1;
 606       num_velements = vpv->num_inputs;
 607       if (num_velements == 0)
 608          num_vbuffers = 0;
 609    }
 610    else {
 611       setup_non_interleaved_attribs(ctx, vp, vpv, arrays,
 612                                     vbuffer, velements, max_index,
 613                                     num_instances);
 614       num_vbuffers = vpv->num_inputs;
 615       num_velements = vpv->num_inputs;
 616    }
 617
 618    cso_set_vertex_buffers(st->cso_context, num_vbuffers, vbuffer);
 619    cso_set_vertex_elements(st->cso_context, num_velements, velements);
 620
 621    /* unreference buffers (frees wrapped user-space buffer objects)
 622     * This is OK, because the pipe driver should reference buffers by itself
 623     * in set_vertex_buffers. */
 624    for (attr = 0; attr < num_vbuffers; attr++) {
 625       pipe_resource_reference(&vbuffer[attr].buffer, NULL);
 626       assert(!vbuffer[attr].buffer);
 627    }
 628 }
 629
 630
 631 /**
 632  * This function gets plugged into the VBO module and is called when
 633  * we have something to render.
 634  * Basically, translate the information into the format expected by gallium.
 635  */
 636 void
 637 st_draw_vbo(struct gl_context *ctx,
 638             const struct gl_client_array **arrays,
 639             const struct _mesa_prim *prims,
 640             GLuint nr_prims,
 641             const struct _mesa_index_buffer *ib,
 642             GLboolean index_bounds_valid,
 643             GLuint min_index,
 644             GLuint max_index)
 645 {
 646    struct st_context *st = st_context(ctx);
 647    struct pipe_context *pipe = st->pipe;
 648    struct pipe_index_buffer ibuffer;
 649    struct pipe_draw_info info;
 650    unsigned i, num_instances = 1;
 651    GLboolean new_array =
 652          st->dirty.st && (st->dirty.mesa & (_NEW_ARRAY | _NEW_PROGRAM)) != 0;
 653
 654    /* Mesa core state should have been validated already */
 655    assert(ctx->NewState == 0x0);
 656
 657    if (ib) {
 658       /* Gallium probably doesn't want this in some cases. */
 659       if (!index_bounds_valid)
 660          if (!vbo_all_varyings_in_vbos(arrays))
 661             vbo_get_minmax_index(ctx, prims, ib, &min_index, &max_index);
 662
 663       for (i = 0; i < nr_prims; i++) {
 664          num_instances = MAX2(num_instances, prims[i].num_instances);
 665       }
 666    }
 667    else {
 668       /* Get min/max index for non-indexed drawing. */
 669       min_index = ~0;
 670       max_index = 0;
 671
 672       for (i = 0; i < nr_prims; i++) {
 673          min_index = MIN2(min_index, prims[i].start);
 674          max_index = MAX2(max_index, prims[i].start + prims[i].count - 1);
 675          num_instances = MAX2(num_instances, prims[i].num_instances);
 676       }
 677    }
 678
 679    /* Validate state. */
 680    if (st->dirty.st) {
 681       GLboolean vertDataEdgeFlags;
 682
 683       /* sanity check for pointer arithmetic below */
 684       assert(sizeof(arrays[0]->Ptr[0]) == 1);
 685
 686       vertDataEdgeFlags = arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj &&
 687                           arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj->Name;
 688       if (vertDataEdgeFlags != st->vertdata_edgeflags) {
 689          st->vertdata_edgeflags = vertDataEdgeFlags;
 690          st->dirty.st |= ST_NEW_EDGEFLAGS_DATA;
 691       }
 692
 693       st_validate_state(st);
 694
 695       if (new_array) {
 696          st_validate_varrays(ctx, arrays, max_index, num_instances);
 697       }
 698
 699 #if 0
 700       if (MESA_VERBOSE & VERBOSE_GLSL) {
 701          check_uniforms(ctx);
 702       }
 703 #else
 704       (void) check_uniforms;
 705 #endif
 706    }
 707
 708    /* Notify the driver that the content of user buffers may have been
 709     * changed. */
 710    assert(max_index >= min_index);
 711    if (!new_array && st->num_user_attribs) {
 712       for (i = 0; i < st->num_user_attribs; i++) {
 713          if (st->user_attrib[i].buffer) {
 714             unsigned element_size = st->user_attrib[i].element_size;
 715             unsigned stride = st->user_attrib[i].stride;
 716             unsigned min_offset = min_index * stride;
 717             unsigned max_offset = max_index * stride + element_size;
 718
 719             assert(max_offset > min_offset);
 720
 721             pipe->redefine_user_buffer(pipe, st->user_attrib[i].buffer,
 722                                        min_offset,
 723                                        max_offset - min_offset);
 724          }
 725       }
 726    }
 727
 728    setup_index_buffer(ctx, ib, &ibuffer);
 729    pipe->set_index_buffer(pipe, &ibuffer);
 730
 731    util_draw_init_info(&info);
 732    if (ib) {
 733       info.indexed = TRUE;
 734       if (min_index != ~0 && max_index != ~0) {
 735          info.min_index = min_index;
 736          info.max_index = max_index;
 737       }
 738    }
 739
 740    info.primitive_restart = st->ctx->Array.PrimitiveRestart;
 741    info.restart_index = st->ctx->Array.RestartIndex;
 742
 743    /* do actual drawing */
 744    for (i = 0; i < nr_prims; i++) {
 745       info.mode = translate_prim( ctx, prims[i].mode );
 746       info.start = prims[i].start;
 747       info.count = prims[i].count;
 748       info.instance_count = prims[i].num_instances;
 749       info.index_bias = prims[i].basevertex;
 750       if (!ib) {
 751          info.min_index = info.start;
 752          info.max_index = info.start + info.count - 1;
 753       }
 754
 755       if (u_trim_pipe_prim(info.mode, &info.count))
 756          pipe->draw_vbo(pipe, &info);
 757    }
 758
 759    pipe_resource_reference(&ibuffer.buffer, NULL);
 760 }
 761
 762
 763 void
 764 st_init_draw(struct st_context *st)
 765 {
 766    struct gl_context *ctx = st->ctx;
 767
 768    vbo_set_draw_func(ctx, st_draw_vbo);
 769
 770 #if FEATURE_feedback || FEATURE_rastpos
 771    st->draw = draw_create(st->pipe); /* for selection/feedback */
 772
 773    /* Disable draw options that might convert points/lines to tris, etc.
 774     * as that would foul-up feedback/selection mode.
 775     */
 776    draw_wide_line_threshold(st->draw, 1000.0f);
 777    draw_wide_point_threshold(st->draw, 1000.0f);
 778    draw_enable_line_stipple(st->draw, FALSE);
 779    draw_enable_point_sprites(st->draw, FALSE);
 780 #endif
 781 }
 782
 783
 784 void
 785 st_destroy_draw(struct st_context *st)
 786 {
 787 #if FEATURE_feedback || FEATURE_rastpos
 788    draw_destroy(st->draw);
 789 #endif
 790 }