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_vbo().
  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  * This is very similar to vbo_all_varyings_in_vbos() but we test
 238  * the stride.  See bug 38626.
 239  */
 240 static GLboolean
 241 all_varyings_in_vbos(const struct gl_client_array *arrays[])
 242 {
 243    GLuint i;
 244
 245    for (i = 0; i < VERT_ATTRIB_MAX; i++)
 246       if (arrays[i]->StrideB && !_mesa_is_bufferobj(arrays[i]->BufferObj))
 247          return GL_FALSE;
 248
 249    return GL_TRUE;
 250 }
 251
 252
 253 /**
 254  * Examine the active arrays to determine if we have interleaved
 255  * vertex arrays all living in one VBO, or all living in user space.
 256  */
 257 static GLboolean
 258 is_interleaved_arrays(const struct st_vertex_program *vp,
 259                       const struct st_vp_variant *vpv,
 260                       const struct gl_client_array **arrays)
 261 {
 262    GLuint attr;
 263    const struct gl_buffer_object *firstBufObj = NULL;
 264    GLint firstStride = -1;
 265    const GLubyte *firstPtr = NULL;
 266    GLboolean userSpaceBuffer = GL_FALSE;
 267
 268    for (attr = 0; attr < vpv->num_inputs; attr++) {
 269       const GLuint mesaAttr = vp->index_to_input[attr];
 270       const struct gl_client_array *array = arrays[mesaAttr];
 271       const struct gl_buffer_object *bufObj = array->BufferObj;
 272       const GLsizei stride = array->StrideB; /* in bytes */
 273
 274       if (attr == 0) {
 275          /* save info about the first array */
 276          firstStride = stride;
 277          firstPtr = array->Ptr;
 278          firstBufObj = bufObj;
 279          userSpaceBuffer = !bufObj || !bufObj->Name;
 280       }
 281       else {
 282          /* check if other arrays interleave with the first, in same buffer */
 283          if (stride != firstStride)
 284             return GL_FALSE; /* strides don't match */
 285
 286          if (bufObj != firstBufObj)
 287             return GL_FALSE; /* arrays in different VBOs */
 288
 289          if (abs(array->Ptr - firstPtr) > firstStride)
 290             return GL_FALSE; /* arrays start too far apart */
 291
 292          if ((!bufObj || !_mesa_is_bufferobj(bufObj)) != userSpaceBuffer)
 293             return GL_FALSE; /* mix of VBO and user-space arrays */
 294       }
 295    }
 296
 297    return GL_TRUE;
 298 }
 299
 300
 301 /**
 302  * Set up for drawing interleaved arrays that all live in one VBO
 303  * or all live in user space.
 304  * \param vbuffer  returns vertex buffer info
 305  * \param velements  returns vertex element info
 306  */
 307 static void
 308 setup_interleaved_attribs(struct gl_context *ctx,
 309                           const struct st_vertex_program *vp,
 310                           const struct st_vp_variant *vpv,
 311                           const struct gl_client_array **arrays,
 312                           struct pipe_vertex_buffer *vbuffer,
 313                           struct pipe_vertex_element velements[],
 314                           unsigned max_index,
 315                           unsigned num_instances)
 316 {
 317    struct st_context *st = st_context(ctx);
 318    struct pipe_context *pipe = st->pipe;
 319    GLuint attr;
 320    const GLubyte *low_addr = NULL;
 321
 322    /* Find the lowest address of the arrays we're drawing */
 323    if (vpv->num_inputs) {
 324       low_addr = arrays[vp->index_to_input[0]]->Ptr;
 325
 326       for (attr = 1; attr < vpv->num_inputs; attr++) {
 327          const GLubyte *start = arrays[vp->index_to_input[attr]]->Ptr;
 328          low_addr = MIN2(low_addr, start);
 329       }
 330    }
 331
 332    for (attr = 0; attr < vpv->num_inputs; attr++) {
 333       const GLuint mesaAttr = vp->index_to_input[attr];
 334       const struct gl_client_array *array = arrays[mesaAttr];
 335       struct gl_buffer_object *bufobj = array->BufferObj;
 336       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 337       unsigned src_offset = (unsigned) (array->Ptr - low_addr);
 338       GLuint element_size = array->_ElementSize;
 339       GLsizei stride = array->StrideB;
 340
 341       assert(element_size == array->Size * _mesa_sizeof_type(array->Type));
 342
 343       if (attr == 0) {
 344          if (bufobj && _mesa_is_bufferobj(bufobj)) {
 345             vbuffer->buffer = NULL;
 346             pipe_resource_reference(&vbuffer->buffer, stobj->buffer);
 347             vbuffer->buffer_offset = pointer_to_offset(low_addr);
 348          }
 349          else {
 350             uint divisor = array->InstanceDivisor;
 351             uint last_index = divisor ? num_instances / divisor : max_index;
 352             uint bytes = src_offset + stride * last_index + element_size;
 353
 354             vbuffer->buffer = pipe_user_buffer_create(pipe->screen,
 355                                                       (void*) low_addr,
 356                                                       bytes,
 357                                                       PIPE_BIND_VERTEX_BUFFER);
 358             vbuffer->buffer_offset = 0;
 359
 360             /* Track user vertex buffers. */
 361             pipe_resource_reference(&st->user_attrib[0].buffer, vbuffer->buffer);
 362             st->user_attrib[0].element_size = element_size;
 363             st->user_attrib[0].stride = stride;
 364             st->num_user_attribs = 1;
 365          }
 366          vbuffer->stride = stride; /* in bytes */
 367       }
 368
 369       velements[attr].src_offset = src_offset;
 370       velements[attr].instance_divisor = array->InstanceDivisor;
 371       velements[attr].vertex_buffer_index = 0;
 372       velements[attr].src_format = st_pipe_vertex_format(array->Type,
 373                                                          array->Size,
 374                                                          array->Format,
 375                                                          array->Normalized);
 376       assert(velements[attr].src_format);
 377    }
 378 }
 379
 380
 381 /**
 382  * Set up a separate pipe_vertex_buffer and pipe_vertex_element for each
 383  * vertex attribute.
 384  * \param vbuffer  returns vertex buffer info
 385  * \param velements  returns vertex element info
 386  */
 387 static void
 388 setup_non_interleaved_attribs(struct gl_context *ctx,
 389                               const struct st_vertex_program *vp,
 390                               const struct st_vp_variant *vpv,
 391                               const struct gl_client_array **arrays,
 392                               struct pipe_vertex_buffer vbuffer[],
 393                               struct pipe_vertex_element velements[],
 394                               unsigned max_index,
 395                               unsigned num_instances)
 396 {
 397    struct st_context *st = st_context(ctx);
 398    struct pipe_context *pipe = st->pipe;
 399    GLuint attr;
 400
 401    for (attr = 0; attr < vpv->num_inputs; attr++) {
 402       const GLuint mesaAttr = vp->index_to_input[attr];
 403       const struct gl_client_array *array = arrays[mesaAttr];
 404       struct gl_buffer_object *bufobj = array->BufferObj;
 405       GLuint element_size = array->_ElementSize;
 406       GLsizei stride = array->StrideB;
 407
 408       assert(element_size == array->Size * _mesa_sizeof_type(array->Type));
 409
 410       if (bufobj && _mesa_is_bufferobj(bufobj)) {
 411          /* Attribute data is in a VBO.
 412           * Recall that for VBOs, the gl_client_array->Ptr field is
 413           * really an offset from the start of the VBO, not a pointer.
 414           */
 415          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 416          assert(stobj->buffer);
 417
 418          vbuffer[attr].buffer = NULL;
 419          pipe_resource_reference(&vbuffer[attr].buffer, stobj->buffer);
 420          vbuffer[attr].buffer_offset = pointer_to_offset(array->Ptr);
 421       }
 422       else {
 423          /* wrap user data */
 424          uint bytes;
 425          void *ptr;
 426
 427          if (array->Ptr) {
 428             uint divisor = array->InstanceDivisor;
 429             uint last_index = divisor ? num_instances / divisor : max_index;
 430
 431             bytes = stride * last_index + element_size;
 432
 433             ptr = (void *) array->Ptr;
 434          }
 435          else {
 436             /* no array, use ctx->Current.Attrib[] value */
 437             bytes = element_size = sizeof(ctx->Current.Attrib[0]);
 438             ptr = (void *) ctx->Current.Attrib[mesaAttr];
 439             stride = 0;
 440          }
 441
 442          assert(ptr);
 443          assert(bytes);
 444
 445          vbuffer[attr].buffer =
 446             pipe_user_buffer_create(pipe->screen, ptr, bytes,
 447                                     PIPE_BIND_VERTEX_BUFFER);
 448
 449          vbuffer[attr].buffer_offset = 0;
 450
 451          /* Track user vertex buffers. */
 452          pipe_resource_reference(&st->user_attrib[attr].buffer, vbuffer[attr].buffer);
 453          st->user_attrib[attr].element_size = element_size;
 454          st->user_attrib[attr].stride = stride;
 455          st->num_user_attribs = MAX2(st->num_user_attribs, attr + 1);
 456       }
 457
 458       /* common-case setup */
 459       vbuffer[attr].stride = stride; /* in bytes */
 460
 461       velements[attr].src_offset = 0;
 462       velements[attr].instance_divisor = array->InstanceDivisor;
 463       velements[attr].vertex_buffer_index = attr;
 464       velements[attr].src_format = st_pipe_vertex_format(array->Type,
 465                                                          array->Size,
 466                                                          array->Format,
 467                                                          array->Normalized);
 468       assert(velements[attr].src_format);
 469    }
 470 }
 471
 472
 473 static void
 474 setup_index_buffer(struct gl_context *ctx,
 475                    const struct _mesa_index_buffer *ib,
 476                    struct pipe_index_buffer *ibuffer)
 477 {
 478    struct st_context *st = st_context(ctx);
 479    struct pipe_context *pipe = st->pipe;
 480
 481    memset(ibuffer, 0, sizeof(*ibuffer));
 482    if (ib) {
 483       struct gl_buffer_object *bufobj = ib->obj;
 484
 485       switch (ib->type) {
 486       case GL_UNSIGNED_INT:
 487          ibuffer->index_size = 4;
 488          break;
 489       case GL_UNSIGNED_SHORT:
 490          ibuffer->index_size = 2;
 491          break;
 492       case GL_UNSIGNED_BYTE:
 493          ibuffer->index_size = 1;
 494          break;
 495       default:
 496          assert(0);
 497          return;
 498       }
 499
 500       /* get/create the index buffer object */
 501       if (bufobj && _mesa_is_bufferobj(bufobj)) {
 502          /* elements/indexes are in a real VBO */
 503          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 504          pipe_resource_reference(&ibuffer->buffer, stobj->buffer);
 505          ibuffer->offset = pointer_to_offset(ib->ptr);
 506       }
 507       else {
 508          /* element/indicies are in user space memory */
 509          ibuffer->buffer =
 510             pipe_user_buffer_create(pipe->screen, (void *) ib->ptr,
 511                                     ib->count * ibuffer->index_size,
 512                                     PIPE_BIND_INDEX_BUFFER);
 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(struct gl_context *ctx)
 525 {
 526    struct gl_shader_program *shProg[3] = {
 527       ctx->Shader.CurrentVertexProgram,
 528       ctx->Shader.CurrentGeometryProgram,
 529       ctx->Shader.CurrentFragmentProgram,
 530    };
 531    unsigned j;
 532
 533    for (j = 0; j < 3; j++) {
 534       unsigned i;
 535
 536       if (shProg[j] == NULL || !shProg[j]->LinkStatus)
 537          continue;
 538
 539       for (i = 0; i < shProg[j]->Uniforms->NumUniforms; i++) {
 540          const struct gl_uniform *u = &shProg[j]->Uniforms->Uniforms[i];
 541          if (!u->Initialized) {
 542             _mesa_warning(ctx,
 543                           "Using shader with uninitialized uniform: %s",
 544                           u->Name);
 545          }
 546       }
 547    }
 548 }
 549
 550
 551 /**
 552  * Translate OpenGL primtive type (GL_POINTS, GL_TRIANGLE_STRIP, etc) to
 553  * the corresponding Gallium type.
 554  */
 555 static unsigned
 556 translate_prim(const struct gl_context *ctx, unsigned prim)
 557 {
 558    /* GL prims should match Gallium prims, spot-check a few */
 559    assert(GL_POINTS == PIPE_PRIM_POINTS);
 560    assert(GL_QUADS == PIPE_PRIM_QUADS);
 561    assert(GL_TRIANGLE_STRIP_ADJACENCY == PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY);
 562
 563    /* Avoid quadstrips if it's easy to do so:
 564     * Note: it's important to do the correct trimming if we change the
 565     * prim type!  We do that wherever this function is called.
 566     */
 567    if (prim == GL_QUAD_STRIP &&
 568        ctx->Light.ShadeModel != GL_FLAT &&
 569        ctx->Polygon.FrontMode == GL_FILL &&
 570        ctx->Polygon.BackMode == GL_FILL)
 571       prim = GL_TRIANGLE_STRIP;
 572
 573    return prim;
 574 }
 575
 576
 577 static void
 578 st_validate_varrays(struct gl_context *ctx,
 579                     const struct gl_client_array **arrays,
 580                     unsigned max_index,
 581                     unsigned num_instances)
 582 {
 583    struct st_context *st = st_context(ctx);
 584    const struct st_vertex_program *vp;
 585    const struct st_vp_variant *vpv;
 586    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 587    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 588    unsigned num_vbuffers, num_velements;
 589    GLuint attr;
 590    unsigned i;
 591
 592    /* must get these after state validation! */
 593    vp = st->vp;
 594    vpv = st->vp_variant;
 595
 596    memset(velements, 0, sizeof(struct pipe_vertex_element) * vpv->num_inputs);
 597
 598    /* Unreference any user vertex buffers. */
 599    for (i = 0; i < st->num_user_attribs; i++) {
 600       pipe_resource_reference(&st->user_attrib[i].buffer, NULL);
 601    }
 602    st->num_user_attribs = 0;
 603
 604    /*
 605     * Setup the vbuffer[] and velements[] arrays.
 606     */
 607    if (is_interleaved_arrays(vp, vpv, arrays)) {
 608       setup_interleaved_attribs(ctx, vp, vpv, arrays, vbuffer, velements,
 609                                 max_index, num_instances);
 610
 611       num_vbuffers = 1;
 612       num_velements = vpv->num_inputs;
 613       if (num_velements == 0)
 614          num_vbuffers = 0;
 615    }
 616    else {
 617       setup_non_interleaved_attribs(ctx, vp, vpv, arrays,
 618                                     vbuffer, velements, max_index,
 619                                     num_instances);
 620       num_vbuffers = vpv->num_inputs;
 621       num_velements = vpv->num_inputs;
 622    }
 623
 624    cso_set_vertex_buffers(st->cso_context, num_vbuffers, vbuffer);
 625    cso_set_vertex_elements(st->cso_context, num_velements, velements);
 626
 627    /* unreference buffers (frees wrapped user-space buffer objects)
 628     * This is OK, because the pipe driver should reference buffers by itself
 629     * in set_vertex_buffers. */
 630    for (attr = 0; attr < num_vbuffers; attr++) {
 631       pipe_resource_reference(&vbuffer[attr].buffer, NULL);
 632       assert(!vbuffer[attr].buffer);
 633    }
 634 }
 635
 636
 637 /**
 638  * This function gets plugged into the VBO module and is called when
 639  * we have something to render.
 640  * Basically, translate the information into the format expected by gallium.
 641  */
 642 void
 643 st_draw_vbo(struct gl_context *ctx,
 644             const struct gl_client_array **arrays,
 645             const struct _mesa_prim *prims,
 646             GLuint nr_prims,
 647             const struct _mesa_index_buffer *ib,
 648             GLboolean index_bounds_valid,
 649             GLuint min_index,
 650             GLuint max_index)
 651 {
 652    struct st_context *st = st_context(ctx);
 653    struct pipe_context *pipe = st->pipe;
 654    struct pipe_index_buffer ibuffer;
 655    struct pipe_draw_info info;
 656    unsigned i, num_instances = 1;
 657    GLboolean new_array =
 658       st->dirty.st &&
 659       (st->dirty.mesa & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT)) != 0;
 660
 661    /* Mesa core state should have been validated already */
 662    assert(ctx->NewState == 0x0);
 663
 664    if (ib) {
 665       /* Gallium probably doesn't want this in some cases. */
 666       if (!index_bounds_valid)
 667          if (!all_varyings_in_vbos(arrays))
 668             vbo_get_minmax_index(ctx, prims, ib, &min_index, &max_index);
 669
 670       for (i = 0; i < nr_prims; i++) {
 671          num_instances = MAX2(num_instances, prims[i].num_instances);
 672       }
 673    }
 674    else {
 675       /* Get min/max index for non-indexed drawing. */
 676       min_index = ~0;
 677       max_index = 0;
 678
 679       for (i = 0; i < nr_prims; i++) {
 680          min_index = MIN2(min_index, prims[i].start);
 681          max_index = MAX2(max_index, prims[i].start + prims[i].count - 1);
 682          num_instances = MAX2(num_instances, prims[i].num_instances);
 683       }
 684    }
 685
 686    /* Validate state. */
 687    if (st->dirty.st) {
 688       GLboolean vertDataEdgeFlags;
 689
 690       /* sanity check for pointer arithmetic below */
 691       assert(sizeof(arrays[0]->Ptr[0]) == 1);
 692
 693       vertDataEdgeFlags = arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj &&
 694                           arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj->Name;
 695       if (vertDataEdgeFlags != st->vertdata_edgeflags) {
 696          st->vertdata_edgeflags = vertDataEdgeFlags;
 697          st->dirty.st |= ST_NEW_EDGEFLAGS_DATA;
 698       }
 699
 700       st_validate_state(st);
 701
 702       if (new_array) {
 703          st_validate_varrays(ctx, arrays, max_index, num_instances);
 704       }
 705
 706 #if 0
 707       if (MESA_VERBOSE & VERBOSE_GLSL) {
 708          check_uniforms(ctx);
 709       }
 710 #else
 711       (void) check_uniforms;
 712 #endif
 713    }
 714
 715    /* Notify the driver that the content of user buffers may have been
 716     * changed. */
 717    assert(max_index >= min_index);
 718    if (!new_array && st->num_user_attribs) {
 719       for (i = 0; i < st->num_user_attribs; i++) {
 720          if (st->user_attrib[i].buffer) {
 721             unsigned element_size = st->user_attrib[i].element_size;
 722             unsigned stride = st->user_attrib[i].stride;
 723             unsigned min_offset = min_index * stride;
 724             unsigned max_offset = max_index * stride + element_size;
 725
 726             assert(max_offset > min_offset);
 727
 728             pipe->redefine_user_buffer(pipe, st->user_attrib[i].buffer,
 729                                        min_offset,
 730                                        max_offset - min_offset);
 731          }
 732       }
 733    }
 734
 735    setup_index_buffer(ctx, ib, &ibuffer);
 736    pipe->set_index_buffer(pipe, &ibuffer);
 737
 738    util_draw_init_info(&info);
 739    if (ib) {
 740       info.indexed = TRUE;
 741       if (min_index != ~0 && max_index != ~0) {
 742          info.min_index = min_index;
 743          info.max_index = max_index;
 744       }
 745    }
 746
 747    info.primitive_restart = ctx->Array.PrimitiveRestart;
 748    info.restart_index = ctx->Array.RestartIndex;
 749
 750    /* do actual drawing */
 751    for (i = 0; i < nr_prims; i++) {
 752       info.mode = translate_prim( ctx, prims[i].mode );
 753       info.start = prims[i].start;
 754       info.count = prims[i].count;
 755       info.instance_count = prims[i].num_instances;
 756       info.index_bias = prims[i].basevertex;
 757       if (!ib) {
 758          info.min_index = info.start;
 759          info.max_index = info.start + info.count - 1;
 760       }
 761
 762       if (u_trim_pipe_prim(info.mode, &info.count))
 763          pipe->draw_vbo(pipe, &info);
 764    }
 765
 766    pipe_resource_reference(&ibuffer.buffer, NULL);
 767 }
 768
 769
 770 void
 771 st_init_draw(struct st_context *st)
 772 {
 773    struct gl_context *ctx = st->ctx;
 774
 775    vbo_set_draw_func(ctx, st_draw_vbo);
 776
 777 #if FEATURE_feedback || FEATURE_rastpos
 778    st->draw = draw_create(st->pipe); /* for selection/feedback */
 779
 780    /* Disable draw options that might convert points/lines to tris, etc.
 781     * as that would foul-up feedback/selection mode.
 782     */
 783    draw_wide_line_threshold(st->draw, 1000.0f);
 784    draw_wide_point_threshold(st->draw, 1000.0f);
 785    draw_enable_line_stipple(st->draw, FALSE);
 786    draw_enable_point_sprites(st->draw, FALSE);
 787 #endif
 788 }
 789
 790
 791 void
 792 st_destroy_draw(struct st_context *st)
 793 {
 794 #if FEATURE_feedback || FEATURE_rastpos
 795    draw_destroy(st->draw);
 796 #endif
 797 }