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  * \param userSpace  returns whether the arrays are in user space.
 241  */
 242 static GLboolean
 243 is_interleaved_arrays(const struct st_vertex_program *vp,
 244                       const struct st_vp_variant *vpv,
 245                       const struct gl_client_array **arrays)
 246 {
 247    GLuint attr;
 248    const struct gl_buffer_object *firstBufObj = NULL;
 249    GLint firstStride = -1;
 250    const GLubyte *client_addr = NULL;
 251    GLboolean user_memory = GL_FALSE;
 252
 253    for (attr = 0; attr < vpv->num_inputs; attr++) {
 254       const GLuint mesaAttr = vp->index_to_input[attr];
 255       const struct gl_client_array *array = arrays[mesaAttr];
 256       const struct gl_buffer_object *bufObj = array->BufferObj;
 257       const GLsizei stride = array->StrideB; /* in bytes */
 258
 259       if (firstStride < 0) {
 260          firstStride = stride;
 261          user_memory = !bufObj || !bufObj->Name;
 262       }
 263       else if (firstStride != stride) {
 264          return GL_FALSE;
 265       }
 266
 267       if (!bufObj || !bufObj->Name) {
 268          /* Try to detect if the client-space arrays are
 269           * "close" to each other.
 270           */
 271          if (!user_memory) {
 272             return GL_FALSE;
 273          }
 274          if (!client_addr) {
 275             client_addr = array->Ptr;
 276          }
 277          else if (abs(array->Ptr - client_addr) > firstStride) {
 278             /* arrays start too far apart */
 279             return GL_FALSE;
 280          }
 281       }
 282       else if (!firstBufObj) {
 283          if (user_memory) {
 284             return GL_FALSE;
 285          }
 286          firstBufObj = bufObj;
 287       }
 288       else if (bufObj != firstBufObj) {
 289          return GL_FALSE;
 290       }
 291    }
 292
 293    return GL_TRUE;
 294 }
 295
 296
 297 /**
 298  * Set up for drawing interleaved arrays that all live in one VBO
 299  * or all live in user space.
 300  * \param vbuffer  returns vertex buffer info
 301  * \param velements  returns vertex element info
 302  */
 303 static void
 304 setup_interleaved_attribs(struct gl_context *ctx,
 305                           const struct st_vertex_program *vp,
 306                           const struct st_vp_variant *vpv,
 307                           const struct gl_client_array **arrays,
 308                           struct pipe_vertex_buffer *vbuffer,
 309                           struct pipe_vertex_element velements[],
 310                           unsigned max_index,
 311                           unsigned num_instances)
 312 {
 313    struct st_context *st = st_context(ctx);
 314    struct pipe_context *pipe = st->pipe;
 315    GLuint attr;
 316    const GLubyte *low_addr = NULL;
 317
 318    /* Find the lowest address of the arrays we're drawing */
 319    if (vpv->num_inputs) {
 320       low_addr = arrays[vp->index_to_input[0]]->Ptr;
 321
 322       for (attr = 1; attr < vpv->num_inputs; attr++) {
 323          const GLubyte *start = arrays[vp->index_to_input[attr]]->Ptr;
 324          low_addr = MIN2(low_addr, start);
 325       }
 326    }
 327
 328    for (attr = 0; attr < vpv->num_inputs; attr++) {
 329       const GLuint mesaAttr = vp->index_to_input[attr];
 330       const struct gl_client_array *array = arrays[mesaAttr];
 331       struct gl_buffer_object *bufobj = array->BufferObj;
 332       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 333       unsigned src_offset = (unsigned) (array->Ptr - low_addr);
 334       GLuint element_size = array->_ElementSize;
 335       GLsizei stride = array->StrideB;
 336
 337       assert(element_size == array->Size * _mesa_sizeof_type(array->Type));
 338
 339       if (attr == 0) {
 340          if (bufobj && _mesa_is_bufferobj(bufobj)) {
 341             vbuffer->buffer = NULL;
 342             pipe_resource_reference(&vbuffer->buffer, stobj->buffer);
 343             vbuffer->buffer_offset = pointer_to_offset(low_addr);
 344          }
 345          else {
 346             uint divisor = array->InstanceDivisor;
 347             uint last_index = divisor ? num_instances / divisor : max_index;
 348             uint bytes = src_offset + stride * last_index + element_size;
 349
 350             vbuffer->buffer = pipe_user_buffer_create(pipe->screen,
 351                                                       (void*) low_addr,
 352                                                       bytes,
 353                                                       PIPE_BIND_VERTEX_BUFFER);
 354             vbuffer->buffer_offset = 0;
 355
 356             /* Track user vertex buffers. */
 357             pipe_resource_reference(&st->user_attrib[0].buffer, vbuffer->buffer);
 358             st->user_attrib[0].element_size = element_size;
 359             st->user_attrib[0].stride = stride;
 360             st->num_user_attribs = 1;
 361          }
 362          vbuffer->stride = stride; /* in bytes */
 363       }
 364
 365       velements[attr].src_offset = src_offset;
 366       velements[attr].instance_divisor = array->InstanceDivisor;
 367       velements[attr].vertex_buffer_index = 0;
 368       velements[attr].src_format = st_pipe_vertex_format(array->Type,
 369                                                          array->Size,
 370                                                          array->Format,
 371                                                          array->Normalized);
 372       assert(velements[attr].src_format);
 373    }
 374 }
 375
 376
 377 /**
 378  * Set up a separate pipe_vertex_buffer and pipe_vertex_element for each
 379  * vertex attribute.
 380  * \param vbuffer  returns vertex buffer info
 381  * \param velements  returns vertex element info
 382  */
 383 static void
 384 setup_non_interleaved_attribs(struct gl_context *ctx,
 385                               const struct st_vertex_program *vp,
 386                               const struct st_vp_variant *vpv,
 387                               const struct gl_client_array **arrays,
 388                               struct pipe_vertex_buffer vbuffer[],
 389                               struct pipe_vertex_element velements[],
 390                               unsigned max_index,
 391                               unsigned num_instances)
 392 {
 393    struct st_context *st = st_context(ctx);
 394    struct pipe_context *pipe = st->pipe;
 395    GLuint attr;
 396
 397    for (attr = 0; attr < vpv->num_inputs; attr++) {
 398       const GLuint mesaAttr = vp->index_to_input[attr];
 399       const struct gl_client_array *array = arrays[mesaAttr];
 400       struct gl_buffer_object *bufobj = array->BufferObj;
 401       GLuint element_size = array->_ElementSize;
 402       GLsizei stride = array->StrideB;
 403
 404       assert(element_size == array->Size * _mesa_sizeof_type(array->Type));
 405
 406       if (bufobj && _mesa_is_bufferobj(bufobj)) {
 407          /* Attribute data is in a VBO.
 408           * Recall that for VBOs, the gl_client_array->Ptr field is
 409           * really an offset from the start of the VBO, not a pointer.
 410           */
 411          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 412          assert(stobj->buffer);
 413
 414          vbuffer[attr].buffer = NULL;
 415          pipe_resource_reference(&vbuffer[attr].buffer, stobj->buffer);
 416          vbuffer[attr].buffer_offset = pointer_to_offset(array->Ptr);
 417       }
 418       else {
 419          /* wrap user data */
 420          uint bytes;
 421          void *ptr;
 422
 423          if (array->Ptr) {
 424             uint divisor = array->InstanceDivisor;
 425             uint last_index = divisor ? num_instances / divisor : max_index;
 426
 427             bytes = stride * last_index + element_size;
 428
 429             ptr = (void *) array->Ptr;
 430          }
 431          else {
 432             /* no array, use ctx->Current.Attrib[] value */
 433             bytes = element_size = sizeof(ctx->Current.Attrib[0]);
 434             ptr = (void *) ctx->Current.Attrib[mesaAttr];
 435             stride = 0;
 436          }
 437
 438          assert(ptr);
 439          assert(bytes);
 440
 441          vbuffer[attr].buffer =
 442             pipe_user_buffer_create(pipe->screen, ptr, bytes,
 443                                     PIPE_BIND_VERTEX_BUFFER);
 444
 445          vbuffer[attr].buffer_offset = 0;
 446
 447          /* Track user vertex buffers. */
 448          pipe_resource_reference(&st->user_attrib[attr].buffer, vbuffer[attr].buffer);
 449          st->user_attrib[attr].element_size = element_size;
 450          st->user_attrib[attr].stride = stride;
 451          st->num_user_attribs = MAX2(st->num_user_attribs, attr + 1);
 452       }
 453
 454       /* common-case setup */
 455       vbuffer[attr].stride = stride; /* in bytes */
 456
 457       velements[attr].src_offset = 0;
 458       velements[attr].instance_divisor = array->InstanceDivisor;
 459       velements[attr].vertex_buffer_index = attr;
 460       velements[attr].src_format = st_pipe_vertex_format(array->Type,
 461                                                          array->Size,
 462                                                          array->Format,
 463                                                          array->Normalized);
 464       assert(velements[attr].src_format);
 465    }
 466 }
 467
 468
 469 static void
 470 setup_index_buffer(struct gl_context *ctx,
 471                    const struct _mesa_index_buffer *ib,
 472                    struct pipe_index_buffer *ibuffer)
 473 {
 474    struct st_context *st = st_context(ctx);
 475    struct pipe_context *pipe = st->pipe;
 476
 477    memset(ibuffer, 0, sizeof(*ibuffer));
 478    if (ib) {
 479       struct gl_buffer_object *bufobj = ib->obj;
 480
 481       switch (ib->type) {
 482       case GL_UNSIGNED_INT:
 483          ibuffer->index_size = 4;
 484          break;
 485       case GL_UNSIGNED_SHORT:
 486          ibuffer->index_size = 2;
 487          break;
 488       case GL_UNSIGNED_BYTE:
 489          ibuffer->index_size = 1;
 490          break;
 491       default:
 492          assert(0);
 493          return;
 494       }
 495
 496       /* get/create the index buffer object */
 497       if (bufobj && _mesa_is_bufferobj(bufobj)) {
 498          /* elements/indexes are in a real VBO */
 499          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 500          pipe_resource_reference(&ibuffer->buffer, stobj->buffer);
 501          ibuffer->offset = pointer_to_offset(ib->ptr);
 502       }
 503       else {
 504          /* element/indicies are in user space memory */
 505          ibuffer->buffer =
 506             pipe_user_buffer_create(pipe->screen, (void *) ib->ptr,
 507                                     ib->count * ibuffer->index_size,
 508                                     PIPE_BIND_INDEX_BUFFER);
 509       }
 510    }
 511 }
 512
 513 /**
 514  * Prior to drawing, check that any uniforms referenced by the
 515  * current shader have been set.  If a uniform has not been set,
 516  * issue a warning.
 517  */
 518 static void
 519 check_uniforms(struct gl_context *ctx)
 520 {
 521    struct gl_shader_program *shProg[3] = {
 522       ctx->Shader.CurrentVertexProgram,
 523       ctx->Shader.CurrentGeometryProgram,
 524       ctx->Shader.CurrentFragmentProgram,
 525    };
 526    unsigned j;
 527
 528    for (j = 0; j < 3; j++) {
 529       unsigned i;
 530
 531       if (shProg[j] == NULL || !shProg[j]->LinkStatus)
 532          continue;
 533
 534       for (i = 0; i < shProg[j]->Uniforms->NumUniforms; i++) {
 535          const struct gl_uniform *u = &shProg[j]->Uniforms->Uniforms[i];
 536          if (!u->Initialized) {
 537             _mesa_warning(ctx,
 538                           "Using shader with uninitialized uniform: %s",
 539                           u->Name);
 540          }
 541       }
 542    }
 543 }
 544
 545
 546 /**
 547  * Translate OpenGL primtive type (GL_POINTS, GL_TRIANGLE_STRIP, etc) to
 548  * the corresponding Gallium type.
 549  */
 550 static unsigned
 551 translate_prim(const struct gl_context *ctx, unsigned prim)
 552 {
 553    /* GL prims should match Gallium prims, spot-check a few */
 554    assert(GL_POINTS == PIPE_PRIM_POINTS);
 555    assert(GL_QUADS == PIPE_PRIM_QUADS);
 556    assert(GL_TRIANGLE_STRIP_ADJACENCY == PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY);
 557
 558    /* Avoid quadstrips if it's easy to do so:
 559     * Note: it's imporant to do the correct trimming if we change the prim type!
 560     * We do that wherever this function is called.
 561     */
 562    if (prim == GL_QUAD_STRIP &&
 563        ctx->Light.ShadeModel != GL_FLAT &&
 564        ctx->Polygon.FrontMode == GL_FILL &&
 565        ctx->Polygon.BackMode == GL_FILL)
 566       prim = GL_TRIANGLE_STRIP;
 567
 568    return prim;
 569 }
 570
 571
 572 static void
 573 st_validate_varrays(struct gl_context *ctx,
 574                     const struct gl_client_array **arrays,
 575                     unsigned max_index,
 576                     unsigned num_instances)
 577 {
 578    struct st_context *st = st_context(ctx);
 579    const struct st_vertex_program *vp;
 580    const struct st_vp_variant *vpv;
 581    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 582    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 583    unsigned num_vbuffers, num_velements;
 584    GLuint attr;
 585    unsigned i;
 586
 587    /* must get these after state validation! */
 588    vp = st->vp;
 589    vpv = st->vp_variant;
 590
 591    memset(velements, 0, sizeof(struct pipe_vertex_element) * vpv->num_inputs);
 592
 593    /* Unreference any user vertex buffers. */
 594    for (i = 0; i < st->num_user_attribs; i++) {
 595       pipe_resource_reference(&st->user_attrib[i].buffer, NULL);
 596    }
 597    st->num_user_attribs = 0;
 598
 599    /*
 600     * Setup the vbuffer[] and velements[] arrays.
 601     */
 602    if (is_interleaved_arrays(vp, vpv, arrays)) {
 603       setup_interleaved_attribs(ctx, vp, vpv, arrays, vbuffer, velements,
 604                                 max_index, num_instances);
 605
 606       num_vbuffers = 1;
 607       num_velements = vpv->num_inputs;
 608       if (num_velements == 0)
 609          num_vbuffers = 0;
 610    }
 611    else {
 612       setup_non_interleaved_attribs(ctx, vp, vpv, arrays,
 613                                     vbuffer, velements, max_index,
 614                                     num_instances);
 615       num_vbuffers = vpv->num_inputs;
 616       num_velements = vpv->num_inputs;
 617    }
 618
 619    cso_set_vertex_buffers(st->cso_context, num_vbuffers, vbuffer);
 620    cso_set_vertex_elements(st->cso_context, num_velements, velements);
 621
 622    /* unreference buffers (frees wrapped user-space buffer objects)
 623     * This is OK, because the pipe driver should reference buffers by itself
 624     * in set_vertex_buffers. */
 625    for (attr = 0; attr < num_vbuffers; attr++) {
 626       pipe_resource_reference(&vbuffer[attr].buffer, NULL);
 627       assert(!vbuffer[attr].buffer);
 628    }
 629 }
 630
 631
 632 /**
 633  * This function gets plugged into the VBO module and is called when
 634  * we have something to render.
 635  * Basically, translate the information into the format expected by gallium.
 636  */
 637 void
 638 st_draw_vbo(struct gl_context *ctx,
 639             const struct gl_client_array **arrays,
 640             const struct _mesa_prim *prims,
 641             GLuint nr_prims,
 642             const struct _mesa_index_buffer *ib,
 643             GLboolean index_bounds_valid,
 644             GLuint min_index,
 645             GLuint max_index)
 646 {
 647    struct st_context *st = st_context(ctx);
 648    struct pipe_context *pipe = st->pipe;
 649    struct pipe_index_buffer ibuffer;
 650    struct pipe_draw_info info;
 651    unsigned i, num_instances = 1;
 652    GLboolean new_array =
 653       st->dirty.st &&
 654       (st->dirty.mesa & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT)) != 0;
 655
 656    /* Mesa core state should have been validated already */
 657    assert(ctx->NewState == 0x0);
 658
 659    if (ib) {
 660       /* Gallium probably doesn't want this in some cases. */
 661       if (!index_bounds_valid)
 662          if (!vbo_all_varyings_in_vbos(arrays))
 663             vbo_get_minmax_index(ctx, prims, ib, &min_index, &max_index);
 664
 665       for (i = 0; i < nr_prims; i++) {
 666          num_instances = MAX2(num_instances, prims[i].num_instances);
 667       }
 668    }
 669    else {
 670       /* Get min/max index for non-indexed drawing. */
 671       min_index = ~0;
 672       max_index = 0;
 673
 674       for (i = 0; i < nr_prims; i++) {
 675          min_index = MIN2(min_index, prims[i].start);
 676          max_index = MAX2(max_index, prims[i].start + prims[i].count - 1);
 677          num_instances = MAX2(num_instances, prims[i].num_instances);
 678       }
 679    }
 680
 681    /* Validate state. */
 682    if (st->dirty.st) {
 683       GLboolean vertDataEdgeFlags;
 684
 685       /* sanity check for pointer arithmetic below */
 686       assert(sizeof(arrays[0]->Ptr[0]) == 1);
 687
 688       vertDataEdgeFlags = arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj &&
 689                           arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj->Name;
 690       if (vertDataEdgeFlags != st->vertdata_edgeflags) {
 691          st->vertdata_edgeflags = vertDataEdgeFlags;
 692          st->dirty.st |= ST_NEW_EDGEFLAGS_DATA;
 693       }
 694
 695       st_validate_state(st);
 696
 697       if (new_array) {
 698          st_validate_varrays(ctx, arrays, max_index, num_instances);
 699       }
 700
 701 #if 0
 702       if (MESA_VERBOSE & VERBOSE_GLSL) {
 703          check_uniforms(ctx);
 704       }
 705 #else
 706       (void) check_uniforms;
 707 #endif
 708    }
 709
 710    /* Notify the driver that the content of user buffers may have been
 711     * changed. */
 712    assert(max_index >= min_index);
 713    if (!new_array && st->num_user_attribs) {
 714       for (i = 0; i < st->num_user_attribs; i++) {
 715          if (st->user_attrib[i].buffer) {
 716             unsigned element_size = st->user_attrib[i].element_size;
 717             unsigned stride = st->user_attrib[i].stride;
 718             unsigned min_offset = min_index * stride;
 719             unsigned max_offset = max_index * stride + element_size;
 720
 721             assert(max_offset > min_offset);
 722
 723             pipe->redefine_user_buffer(pipe, st->user_attrib[i].buffer,
 724                                        min_offset,
 725                                        max_offset - min_offset);
 726          }
 727       }
 728    }
 729
 730    setup_index_buffer(ctx, ib, &ibuffer);
 731    pipe->set_index_buffer(pipe, &ibuffer);
 732
 733    util_draw_init_info(&info);
 734    if (ib) {
 735       info.indexed = TRUE;
 736       if (min_index != ~0 && max_index != ~0) {
 737          info.min_index = min_index;
 738          info.max_index = max_index;
 739       }
 740    }
 741
 742    info.primitive_restart = st->ctx->Array.PrimitiveRestart;
 743    info.restart_index = st->ctx->Array.RestartIndex;
 744
 745    /* do actual drawing */
 746    for (i = 0; i < nr_prims; i++) {
 747       info.mode = translate_prim( ctx, prims[i].mode );
 748       info.start = prims[i].start;
 749       info.count = prims[i].count;
 750       info.instance_count = prims[i].num_instances;
 751       info.index_bias = prims[i].basevertex;
 752       if (!ib) {
 753          info.min_index = info.start;
 754          info.max_index = info.start + info.count - 1;
 755       }
 756
 757       if (u_trim_pipe_prim(info.mode, &info.count))
 758          pipe->draw_vbo(pipe, &info);
 759    }
 760
 761    pipe_resource_reference(&ibuffer.buffer, NULL);
 762 }
 763
 764
 765 void
 766 st_init_draw(struct st_context *st)
 767 {
 768    struct gl_context *ctx = st->ctx;
 769
 770    vbo_set_draw_func(ctx, st_draw_vbo);
 771
 772 #if FEATURE_feedback || FEATURE_rastpos
 773    st->draw = draw_create(st->pipe); /* for selection/feedback */
 774
 775    /* Disable draw options that might convert points/lines to tris, etc.
 776     * as that would foul-up feedback/selection mode.
 777     */
 778    draw_wide_line_threshold(st->draw, 1000.0f);
 779    draw_wide_point_threshold(st->draw, 1000.0f);
 780    draw_enable_line_stipple(st->draw, FALSE);
 781    draw_enable_point_sprites(st->draw, FALSE);
 782 #endif
 783 }
 784
 785
 786 void
 787 st_destroy_draw(struct st_context *st)
 788 {
 789 #if FEATURE_feedback || FEATURE_rastpos
 790    draw_destroy(st->draw);
 791 #endif
 792 }